No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In skin–macrophage co-culture, lingering dead-cell remains may prolong inflammation and dermal growth. Persistence after verified complete removal, followed by abolition through selective removal of extrachromosomal material from keratinocytes, would reject this mechanism.
Conclusion and evidence (3 findings)
No direct test of this prediction was found in the three supplied studies. The two wound studies from 2026 connect enhanced apoptotic-cell uptake with improved repair, while the complement study demonstrates that dead-cell surface chemistry affects uptake. None manipulates processing-time variability while holding its mean and cell input constant, measures complete intracellular degradation, or tests residual-material removal and transfer after barrier recovery. Enhanced clearance also accompanies increased collagen deposition during acute repair, so these results cannot establish that clearance terminates prolonged dermal growth. The evidence supports components only; it provides neither direct confirmation nor an adequately controlled refutation.
Prediction being checked
After skin-barrier recovery, persistent dead-cell material stores inflammatory history: at equal dead-cell burden, mean arrival rate and mean processing time, greater variability in processing time delays complete clearance and prolongs dermal growth. Removing residual material should shorten the response to renewed irritation without changing epidermal DNA or chromatin accessibility; transferring comparable material into previously unexposed skin should reproduce a prolonged response that ends when processing is complete.
Conditions and limits of the evidence
Available experiments concern full-thickness skin wounds in mice with dextran-sulfate-sodium-induced colitis, diabetic rat wounds, and human or mouse macrophage cultures. The hypothesis does not specify a species. Its defining condition, renewed irritation after verified barrier recovery, was not tested. Epidermal inflammatory memory, extrachromosomal keratinocyte material, wound reopening and antitumor surveillance remain beyond these experiments.
The experiment still needed
In a skin model with verified functional barrier recovery, compare narrow and broad distributions of dead-cell processing times while matching total burden, mean arrival rate, mean processing time and macrophage abundance. Track individual remnants through uptake and complete degradation, alongside inflammation, fibroblast proliferation and dermal matrix accumulation. Randomize selective residual-material removal versus sham treatment before identical rechallenge, and transfer matched remnants into previously unexposed skin with appropriate transfer controls. Verify unchanged epidermal DNA and chromatin accessibility. If the response persists after clearance verified by sensitive independent assays, test selective removal of extrachromosomal keratinocyte material. Assess wound integrity and antitumor surveillance separately.
Supports one part of the mechanism
The carbon-dot study (2026) found increased apoptotic-neutrophil uptake and improved wound closure; colonic Ccl1 knockdown attenuated these effects and reduced collagen deposition. This links clearance-related signaling to repair, but increased collagen during acute healing does not test termination of dermal growth after barrier recovery. Uptake measurements do not establish complete degradation.
Experimental system: C57BL/6J mice with induced colitis and full-thickness dorsal wounds; mouse bone-marrow-derived macrophages cocultured with labeled neutrophils.
Carbon dot treatment also increased collagen fiber density and thickness on the wound lesion edge
Supports one part of the mechanism
The grape-nanovesicle study (2026) measured uptake of two sequentially supplied, differently labeled batches of apoptotic cells. Treatment increased sequential uptake, and the hydrogel treatment improved diabetic wound repair. This tests repeated engulfment, not the distribution of times to complete digestion. The treatment also changes macrophage phenotype and tissue-cell proliferation, preventing attribution to residual-material clearance alone.
Experimental system: Mouse RAW264.7 macrophages fed apoptotic human Jurkat cells in two successive incubations; separate full-thickness wound experiments in diabetic male Sprague-Dawley rats.
In the sustained efferocytosis assay, G-ELNs treated macrophages could significantly increase the level of sustained efferocytosis.
Supports one part of the mechanism
The malondialdehyde-epitope study (2026) found preferential uptake of epitope-rich apoptotic cells, enhanced by functional serum complement, in one-hour assays. This supports cargo-dependent differences in recognition and engulfment. It does not measure digestion-time variability, skin inflammation or dermal growth.
Experimental system: Human THP-1-derived macrophage-like cells and primary mouse peritoneal macrophages, with apoptotic cell fractions and normal, heat-inactivated or complement-regulator-deficient serum.
However, the strongest uptake of MDA high (H) cells was observed only when serum with fully functional complement was used.
Search scope: 9 queries, 3 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:41608581 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:41937946 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42564764 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cellular debris clearance delays) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (efferocytosis degradation kinetics) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cellular debris inflammation resolution) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (delayed efferocytosis skin memory) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (phagolysosomal degradation time variability) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (efferocytosis macrophage profibrotic signaling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In restored tissue-like skin samples, mild membrane injury may temporarily strengthen repair and resistance to friction. The proposal loses support if resistance only increases with rest or depends entirely on the current calcium state; harmless stimulation must not substitute for injury.
Conclusion and evidence (2 findings)
No direct test of this prediction was found in the supplied article. The 2024 membrane-tension study demonstrates wound-induced membrane trafficking and effects of tension manipulation on acute resealing in endothelial cells. It does not examine recovered skin, repeated challenges, protection that decays with rest, or injury-free preconditioning with matched signals. Its endocytosis inhibitors also impair initial resealing, so they do not selectively test adaptive repair while preserving basal repair. The evidence supports components and identifies an alternative physical influence on repair; it neither confirms nor directly refutes the proposed injury-dependent memory.
Prediction being checked
In recovered organotypic skin, mild reversible membrane injury temporarily raises the threshold for subsequent friction damage at equal cumulative washing, drying and friction exposure, after hydration, pH, intracellular calcium and baseline membrane permeability are matched. Protection decays with rest and requires inducible enhancement of membrane repair while basal resealing remains intact; matching mechanical and calcium signals without membrane injury cannot substitute for preconditioning.
Conditions and limits of the evidence
The experiments used primary human umbilical vein endothelial cells, laser membrane injury and mechanical scraping, with calcium, cytoskeletal, substrate-stiffness and membrane-area manipulations. They measured acute resealing and membrane trafficking, not the friction-damage threshold of keratinocytes in organotypic skin. Load-order effects, failure of cumulative-damage rules, maintenance of youthful skin resilience and human lifespan benefits remain beyond the evidence.
The experiment still needed
Randomize recovered organotypic skin samples to identical washing, drying and friction exposures with reversed mild/main challenge order and several recovery intervals. Before the main challenge, match hydration, pH, intracellular calcium and membrane permeability; measure membrane-injury thresholds separately from resealing kinetics. Compare verified reversible membrane injury with injury-free stimulation that reproduces mechanical and calcium signals. Selectively suppress inducible repair enhancement, verifying preserved basal resealing and viability, and include rescue controls. Adequate biological replication and sensitivity must distinguish transient protection, its loss after prolonged rest and its dependence on actual membrane injury.
Supports one part of the mechanism
The 2024 membrane-tension study detected increased clathrin-mediated endocytosis near laser wounds after resealing, spatially associated with preceding early-endosome exocytosis. This supports a post-injury membrane-remodeling response, but neither persistent repair memory nor improved resistance to a later challenge was tested.
Experimental system: Cultured primary human umbilical vein endothelial cells subjected to laser membrane injury and live fluorescence imaging.
This indicated that CME was enhanced near the wound site post‐wound resealing in HUVEC
Challenges one part of the mechanism
In the 2024 study, cytochalasin D treatment permitted efficient resealing even at low extracellular calcium, with no discernible wound-induced early-endosome exocytosis or increased clathrin-mediated endocytosis. This challenges treating enhanced membrane trafficking as universally necessary for acute repair and highlights membrane tension as a competing explanation. It does not test injury-dependent preconditioning in skin.
Experimental system: Primary human umbilical vein endothelial cells treated with cytochalasin D, laser-wounded at low extracellular calcium and assessed by dye influx and fluorescent trafficking markers.
did not inhibit efficient membrane repair
Search scope: 10 queries, 1 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:15317814 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39360573 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39458505 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cAMP response element-binding protein membrane repair) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (CREB membrane repair adaptation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (CREB transcription activation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (membrane repair keratinocyte tolerance) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (membrane resealing repeated injury) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (calcium homeostasis keratinocyte tolerance) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:15317814 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In a co-culture of keratinocytes, fibroblasts and macrophages, fluctuating inflammation may repeatedly activate nuclear factor kappa B (NF-κB), prolonging skin growth. Reject this if variability below the activation threshold leaves repeat activations unchanged, or changing them does not affect repair completion.
Conclusion and evidence (4 findings)
No direct test of this conditional prediction appears in the supplied studies. Experiments demonstrate stimulus-history-dependent NF-κB responses, temperature-sensitive fibroblast signaling and molecular control of RelB oscillations. None independently varies inflammatory-input variance at a verified subthreshold mean while matching the specified skin conditions, measures the resulting dermal recovery, or compares the proposed schedules. Macrophage tolerance also shows that repeated stimulation can attenuate signaling, but under different conditions and therefore without refuting this prediction. The verdict reflects component-only evidence and absence of a direct test, rather than mixed direct evidence or an informative null result.
Prediction being checked
After a sleep-schedule shift, increasing the variance of a weak inflammatory input whose mean is below the activation threshold increases discrete NF-κB reactivations in local skin immune cells and persistent dermal proliferation, despite matched tissue circadian phases, ciliary state and cumulative local cytokine exposure. Scheduling treatment by individually estimated reactivation probability improves recovery compared with scheduling by mean tissue phase lag, at equal treatment count, total exposure and follow-up.
Conditions and limits of the evidence
The proposed system comprises epidermis, dermis and local immune cells after a sleep shift; the species and treatment procedure are unspecified. Available experiments use mouse macrophage and fibroblast cultures and human lymphoma cells undergoing herpesvirus reactivation. They do not establish intertissue circadian mismatch, ciliary involvement, incomplete skin repair or clinical benefit from probability-based scheduling.
The experiment still needed
Specify the organism and treatment, then test skin after a controlled sleep shift. Establish the local activation threshold and randomize inflammatory-input waveforms with equal subthreshold means and cumulative cytokine exposure but different variances, matching measured epidermal, dermal and immune-cell phases and ciliary state. Track single-cell NF-κB reactivations, persistent dermal proliferation and recovery between procedures; selectively suppress reactivation to test its causal contribution. Separately randomize probability-based versus mean-phase-lag schedules with equal treatment count, total exposure and follow-up. Validate stimulus delivery, reporter sensitivity and viability, and use confidence intervals that can exclude a prespecified meaningful effect.
Supports one part of the mechanism
The 2026 macrophage study found lower integrated NF-κB activity and amplitude after prior lipopolysaccharide exposure. This establishes stimulus-history dependence and provides an attenuating alternative to repeated inflammatory reinforcement. It did not manipulate input variance, verify the proposed subthreshold regime or measure skin repair.
Experimental system: Mouse RAW264.7 reporter macrophages: 100 ng/mL lipopolysaccharide for 24 hours, 24-hour rest, then 10 ng/mL restimulation, compared with a single 10 ng/mL stimulation.
Both the AUC and amplitude of NF-κB were higher following primary LPS stimulation (LPS 1°) than under LPS tolerance
Supports one part of the mechanism
The 2026 fibroblast study directly showed temperature-dependent timing of NF-κB nuclear oscillations. This supports environmental modulation of signaling dynamics, but temperature changes are not an isolated manipulation of inflammatory-input variance. Sleep shifts, tissue phases, cilia and repair were not tested.
Experimental system: Immortalized mouse ear fibroblasts with endogenous RelA and c-Rel fluorescent reporters, stimulated with tumor necrosis factor alpha or interleukin-1 beta at 24, 34, 37 or 40°C.
the period of RelA oscillation, defined as the time interval between the first and second nuclear peaks, became progressively shorter as temperature increased
Supports one part of the mechanism
The 2026 RelB study showed that reducing p100/p52 expression permits spontaneous oscillations, supporting molecular control of oscillation probability. This concerns noncanonical NF-κB signaling after genetic perturbation, not variable weak inflammatory input in skin. Reduced target-gene induction after a separate nuclear-export mutation was confounded by broader signaling changes and did not establish an oscillation-specific effect on repair.
Experimental system: Immortalized mouse embryonic fibroblasts carrying a RelB-Venus reporter, with Nfkb2 knockdown; knockout experiments independently supported spontaneous oscillations.
Nfkb2 knockdown alone induced spontaneous RelB oscillations in more than 80% of cells without LTβR stimulation
Related research
The 2026 herpesvirus study associated high interferon-beta expression with RelA phosphorylation after blocking interferon feedback. This identifies cellular heterogeneity, but does not show that input fluctuations cause repeated NF-κB activation. Its evidence against independent stochastic interferon-promoter firing addresses a different mechanism and cannot refute the skin hypothesis.
Experimental system: Human BC-3 primary effusion lymphoma cells infected with Kaposi sarcoma-associated herpesvirus, undergoing chemically induced lytic reactivation with caspase inhibition and interferon-blocking antibodies.
IFN-β high cells were also enriched in phosphorylated RelA, one of the NF-κB components
Search scope: 9 queries, 4 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42390017 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42725079 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42325251 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (nuclear factor kappa B stochastic reactivation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (NF-κB stochastic reactivation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (NF-κB inflammatory signaling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (stochastic reactivation skin repair) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (noise-driven threshold crossing) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (NF-κB negative feedback oscillations) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
Gland-bound autoantibodies may suppress sweat secretion by blocking muscarinic receptor subtype 3 (M3) despite normalized mechanics. Failure of extracted antibodies to transfer blocking activity, with recovery of bound antibodies confirmed, would reject the hypothesis.
Conclusion and evidence (4 findings)
No direct test of this prediction was found in the supplied studies. The strongest component evidence is the 2020 primary biliary cholangitis experiment: patient serum immunoglobulins inhibited carbachol-induced calcium signaling in M3-expressing cells. It did not examine antibodies extracted from affected sweat glands, secretion after mechanical normalization, or selective M3-antibody removal and add-back. The other studies provide observational or pharmacological evidence in different conditions. Thus, the verdict reflects indirect component support and an absent decisive experiment, rather than mixed direct evidence or an informative experimental refutation.
Prediction being checked
Persistent loss of sweating after normalization of skin mechanics is maintained by gland-associated antibodies that block the muscarinic acetylcholine receptor M3. Extracted immunoglobulins should suppress M3 signaling and secretion in control sweat glands at unchanged stiffness and duct patency; selective removal of M3-binding antibodies should abolish this effect, and adding them back should restore it, while independently validated receptor-bypass responses remain intact.
Conditions and limits of the evidence
The focal system is sweat glands with persistent secretory impairment after mechanical normalization; the hypothesis does not specify a species. Available evidence concerns human serum applied to engineered Chinese hamster ovary cells and a human bile-duct carcinoma cell line, human salivary-gland observations, swallowing dysfunction, and pilocarpine responses in Sjögren syndrome. It does not establish antibody-mediated persistence or reversibility of the specified sweat-gland defect.
The experiment still needed
Use affected sweat-gland samples with documented persistent hyposecretion after mechanical normalization. Verify recovery and preserved activity of tissue-bound immunoglobulins, then compare equal immunoglobulin concentrations from affected and control samples in an M3 reporter assay and matched control sweat glands. Include mock depletion, selective M3-binding antibody depletion and add-back, viability controls, and a validated receptor-bypass stimulus. Measure secretion, stiffness and duct patency throughout. Loss of inhibition after depletion and its return after add-back would support the prediction. Absence of transferable inhibition would contradict it only with verified extraction, adequate exposure, positive controls and sensitivity sufficient to exclude a biologically meaningful effect.
Supports one part of the mechanism
The 2020 cholangitis study transferred serum immunoglobulins to cultured cells and measured inhibition of the calcium response to 2 μM carbachol after one hour of exposure. This supports transferable inhibition of muscarinic signaling, but neither sweat-gland secretion nor M3-specific depletion and add-back was tested.
Experimental system: Human primary biliary cholangitis serum immunoglobulins; M3-transfected Chinese hamster ovary cells and human TFK-1 bile-duct carcinoma cells.
Immunoglobulins from 30 of the 38 PBC patients (79%) inhibited mAChR3 function on TFK-1 cells
Challenges one part of the mechanism
The 2026 oral lichen planus study reported lower tissue antibody levels in patients with dry mouth, a direction that challenges a simple antibody-abundance explanation. This was a case-control association; blocking activity was uncharacterized. It cannot refute a mechanism involving a particular functional antibody fraction in sweat glands.
Experimental system: Labial minor salivary-gland tissue, serum and saliva from 35 patients with oral lichen planus and xerostomia and 25 healthy controls.
However, the salivary gland tissue anti-M3R Ab levels were significantly lower in the OLP group
Related research
In the 2022 systemic sclerosis case report, swallowing improved after intravenous immunoglobulin, while manometry showed no improvement in esophageal peristalsis. Two uncontrolled cases, including one receiving cyclophosphamide, cannot establish specific antibody neutralization. The persistent motility defect is not a direct refutation of the sweat-gland prediction.
Experimental system: Two patients with systemic sclerosis, severe swallowing dysfunction and circulating antibodies against muscarinic receptor M3.
Neither patient showed improvement in esophageal peristalsis after IVIG despite marked clinical improvement in swallowing function.
Related research
The 2023 pilocarpine study recorded sweating as an adverse effect after a single 5 mg oral dose. It did not quantify sweat-gland secretion, select patients with the specified persistent defect, or test antibody activity. Pilocarpine stimulates muscarinic receptors and therefore does not provide the required receptor-bypass control.
Experimental system: Twenty-seven patients with Sjögren syndrome and dry mouth receiving a single oral pilocarpine dose; the main measurements concerned tear-film dynamics and dryness symptoms.
Of the 27 cases, mild sweating was observed in 2 (7%) cases
Search scope: 9 queries, 4 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42298537 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39018744 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:32695096 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Muscarinic acetylcholine receptor M3 autoantibody blockade) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (M3R autoantibody blockade) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (M3R cholinergic sweat secretion) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Blocking autoantibodies impaired sweating) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Muscarinic receptor autoantibodies secretory dysfunction) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (M3R desensitization impaired sweating) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In living epidermis, repeated friction may interrupt calcium recovery after washing and drying despite maintained adenosine triphosphate concentration. The mechanism loses support if load history remains protective after calcium state and recovery kinetics are matched.
Conclusion and evidence (1 findings)
No direct test of this prediction was found in the supplied evidence. The 2026 mouse psoriasis study reports that deleting a calcium-permeable channel reduces imiquimod-induced dermatitis, providing only component-level support for calcium-channel involvement in skin injury. It does not compare washing, drying and friction sequences, establish maintained ATP concentration, measure calcium-restoration energy costs, or equalize calcium recovery. Neither direct supporting nor direct contradictory evidence is available. The human keratinocyte study of Hailey-Hailey disease has an unavailable full text.
Prediction being checked
In living epidermis exposed to equal cumulative washing, drying and friction, short recovery intervals cause overlapping calcium influx and restoration, increasing energy expenditure per unit of calcium redistribution despite maintained adenosine triphosphate (ATP) concentration. Longer pauses improve friction tolerance to a plateau; matching calcium distribution and recovery kinetics eliminates sequence effects, including those associated with prior membrane microdamage.
Conditions and limits of the evidence
The available primary experiments concern imiquimod-treated skin of 6–8-week-old mice and cultured primary mouse keratinocytes. The hypothesis concerns mechanically challenged living epidermis and does not specify a species. These experiments establish neither friction tolerance nor failure of the Palmgren–Miner cumulative-damage rule, and support no conclusion about human lifespan.
The experiment still needed
Compare equal cumulative washing, drying and friction exposures with different orders and recovery intervals in viable epidermis. Verify maintained ATP concentration while measuring energy turnover, compartment-resolved calcium recovery and a predefined friction-damage threshold. Test whether longer pauses produce a tolerance plateau and whether experimentally matching calcium distribution and recovery kinetics eliminates sequence effects, including after prior membrane microdamage. Use controls for hydration, baseline damage and intervention effects, with sensitivity sufficient to establish equivalence. Persistence of protection after matching would favor load-history adaptation; deterioration in isolated stratum corneum reversed by surface-protease inhibition would favor the alternative surface mechanism.
Supports one part of the mechanism
The 2026 psoriasis study compared channel-deficient and wild-type mice receiving imiquimod or vehicle for seven days. Channel deletion reduced dermatitis severity and epidermal thickening. This supports involvement of the calcium-permeable TRPV4 channel in chemically induced skin inflammation, but does not test competing calcium fluxes, recovery efficiency or sequence-dependent friction damage.
Experimental system: Dorsal skin of male C57BL/6 mice aged 6–8 weeks, with or without TRPV4 deletion; topical imiquimod or vehicle for seven days, six mice per group for dermatitis outcomes.
Notably, these pathological manifestations were substantially alleviated in TRPV4 KO mice following IMQ treatment.
Search scope: 9 queries, 1 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:40199326 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42605981 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39642881 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (adenosine triphosphate futile cycling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ATP calcium futile cycling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ATP epidermal calcium homeostasis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (calcium recovery friction tolerance) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ion cycling energy dissipation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (keratinocyte membrane repair adaptation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In skin models, copying deoxyribonucleic acid (DNA) outside chromosomes may preserve inflammatory memory after barrier recovery and prolong deeper skin growth. The hypothesis is rejected if the molecules only dilute during cell division, their removal leaves the repeat response unchanged, or only debris clearance ends it.
Conclusion and evidence (3 findings)
No direct test of this prediction was found in the supplied studies. The 2021 circular-DNA study demonstrates inflammatory activity in mouse immune cells, and the 2025 liver study supports DNA-dependent communication between hepatocytes and macrophages. Neither tests post-inflammatory skin, inherited DNA junctions across keratinocyte divisions, selective DNA removal and rescue, or prolonged fibroblast proliferation. Laboratory rolling-circle amplification is not evidence of replication inside cells; the liver study's nucleotide-labeling experiments measured nuclear and micronuclear DNA replication without demonstrating replication of specific extrachromosomal circles. The verdict reflects component support and absence of a direct test, rather than conflicting direct evidence or an informative refutation.
Prediction being checked
After inflammation and restoration of the skin barrier, basal keratinocytes replicate and inherit damage-derived extrachromosomal DNA that sustains prolonged mediator secretion and dermal fibroblast proliferation upon rechallenge, independently of retained macrophages or dead-cell remnants. Selective removal of this DNA should shorten both responses, and physiological-dose replacement should restore them after rest; restoring baseline chromatin accessibility alone should be insufficient.
Conditions and limits of the evidence
The experiments concern mouse embryonic stem cells, cultured cell lines, mouse dendritic cells and macrophages, and mouse liver disease models; human liver samples provide observational evidence. Neither study establishes epidermal inflammatory memory, matched recovery of barrier function, preserved wound strength, normal responses to new injury, or preserved antitumor surveillance after selective DNA removal.
The experiment still needed
Use a skin model after inflammation has resolved, matching baseline water loss and tracer permeability. Verify macrophage replacement and dead-cell-remnant clearance. Track the same extrachromosomal junctions through basal-keratinocyte divisions and demonstrate new synthesis of those molecules, distinguishing replication from recurrent formation or dilution. Compare selective DNA depletion, sham treatment, and restoration of baseline chromatin accessibility, with verified target engagement and cell viability. After rest and rechallenge, measure mediator-secretion duration and fibroblast-proliferation duration; test rescue with purified physiological-dose material and appropriate delivery controls. Separately assess ordinary injury responses, wound strength and dehiscence, and clearance of transformed cells against prespecified acceptable-loss margins.
Supports one part of the mechanism
In the 2021 study, linearizing purified circles abolished their cytokine-inducing activity in dendritic cells. Synthetic circular-versus-linear controls supported a role for topology, and loss of STING, an adaptor in intracellular DNA sensing, abolished the transcriptional response. This supports inflammatory activity of circular DNA, but does not establish its replication or inheritance in keratinocytes.
Experimental system: Mouse bone-marrow-derived dendritic cells transfected with purified or synthetic circular DNA and linear controls.
These results demonstrated that the circular nature of eccDNAs is critical for their strong immunostimulant activity.
Supports one part of the mechanism
In the 2025 liver study, transfected hepatocyte-derived circles induced inflammatory gene expression in macrophages at 10 ng/ml; deletion of either the DNA sensor cGAS or its signaling adaptor STING abolished induction. This supports an immune-cell response to hepatocyte DNA, not a keratinocyte memory mechanism or a fibroblast-growth endpoint.
Experimental system: Mouse bone-marrow-derived macrophages receiving extrachromosomal circular DNA from the mouse hepatocyte line AML12.
eccDNA from AML12 cells induced a significantly higher expression of Ifnb1 and Tnfa
Challenges one part of the mechanism
Conditioned medium from reversine-treated hepatocytes failed to induce the interferon response. Direct addition of purified circles at 30 ng/ml also failed, whereas a micronucleus-enriched fraction induced it. This identifies a delivery limitation and a possible particulate carrier; it does not refute intracellular DNA-driven skin memory or establish selective causality of circular DNA within that fraction.
Experimental system: Mouse bone-marrow-derived macrophages exposed to conditioned medium, extracellular purified DNA, or a micronucleus-enriched fraction from reversine-treated AML12 cells.
did not result in an increased expression of Ifnb1
Search scope: 11 queries, 2 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:34320411 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:34671165 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:41110800 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (extrachromosomal circular DNA replication) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eccDNA replication) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eccDNA innate immunity) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eccDNA replication epidermal memory) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (episomal inheritance inflammatory memory) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (chromatin accessibility inflammatory memory) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:34671165 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:34320411 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In an innervated experimental model, competition among signals from regenerating skin sites could let the strongest input sustain an autonomic response. Confirmed selective sensory blockade that produces no dependence on site rank would refute this proposed selection rule.
Conclusion and evidence (4 findings)
No supplied study directly tests this prediction in simultaneously healing skin sites. The evidence supports separate components: inhibitory modulation of sensory transmission and a contribution of sensory innervation to local sympathetic signaling in cancer. No experiment ranks competing sites, compares selective reversible blockade of stronger versus weaker inputs, or matches mediator entry and clearance. Cortical plasticity findings raise an alternative to dependence exclusively on current input, but do not directly contradict the proposed autonomic mechanism. The verdict reflects absence of a direct test, rather than mixed direct evidence or an informative negative experiment.
Prediction being checked
During simultaneous healing of several skin sites, with matched total injury area and comparable inflammatory-mediator entry into blood and clearance, the strongest ongoing sensory input predominantly determines the systemic sympathetic response. Reversibly blocking that site's afferents should rapidly lower the response to the level driven by the next strongest site; blocking weaker sites should have smaller effects. Blocking all sites should terminate the neurally maintained response without persistent central memory, with corresponding changes in circulating immune-cell activity.
Conditions and limits of the evidence
The hypothesis concerns multiple healing skin sites with persistent sensory sensitization; species, injury type and healing interval are unspecified. The supplied experiments concern rat nerve injury, mouse hyperhidrosis, mouse oral cancer, diabetic rats and mouse cortical pain circuits. They do not establish rank-dependent systemic autonomic control during skin regeneration, downstream circulating immune-cell effects, mediator-clearance saturation, safe treatment overlap or human longevity benefit.
The experiment still needed
In a defined model of simultaneous skin healing, measure and rank ongoing afferent activity while matching total injury area and verifying comparable mediator entry and clearance. Randomize selective reversible blockade of the strongest and weaker sites, verify sensory blockade and recovery, and exclude direct sympathetic blockade or systemic drug effects. Record sympathetic output, autonomic physiology and circulating immune-cell function on appropriate timescales. Compare the combined response with each site's response alone, then block all sites and test persistence. A reproducible drop to the second site's level specifically after blocking the strongest site would support the prediction; comparable effects across ranks with adequate sensitivity would contradict it.
Supports one part of the mechanism
The 2026 neuropathic-pain study used topical activation of the cold-sensitive channel TRPM8 and spinal receptor pharmacology to demonstrate inhibitory modulation of distinct nociceptive inputs. This supports sensory gating, but neither competition between healing sites nor systemic autonomic and inflammatory consequences was tested.
Experimental system: Adult male Sprague-Dawley rats with sciatic nerve chronic constriction injury; paw-withdrawal assays and calcium responses in dorsal spinal cord synaptoneurosomes.
icilin inhibition of β-alanine responses was significantly attenuated by the mGlu 2 antagonist
Supports one part of the mechanism
The 2026 oral-cancer study found that local sensory denervation before tumor establishment prevented elevated tumor norepinephrine and attenuated sympathetic-neuron sensitization. Tumor growth was unchanged in this sensory-denervation experiment. This supports sensory influence on local sympathetic signaling, but does not test rapid blockade, input ranking, circulating immune function or healing skin.
Experimental system: Male and female C57BL/6 mice with MOC2 tongue tumors; resiniferatoxin-mediated local sensory denervation, tumor norepinephrine measurements and superior cervical ganglion assays.
RTX denervation before inoculation blocked the elevated NE concentration in tumors from MOC2 tumor–bearing mice
Related research
The 2026 diabetes study tracked circulating inflammatory mediators and paw-withdrawal thresholds. The exaggerated exercise pressor reflex was documented in earlier experiments, not measured in these same rats. These observations provide inflammatory context but establish neither sensory control of autonomic output nor mediator-clearance saturation.
Experimental system: Longitudinal measurements in 18 male UCD type 2 diabetic rats and 18 healthy male Sprague-Dawley controls.
IL‐6 and IL‐1β were higher, and IL‐4 remained lower in the T2DM rats compared with controls
Challenges one part of the mechanism
The 2026 cortical-pain study demonstrated lasting synaptic depression after transient kainate application in isolated cortical slices and altered plasticity after nerve injury. This challenges a general assumption that neural effects depend only on current peripheral input. It does not show persistent systemic autonomic activity after verified blockade of all healing skin sites, so it does not refute the focal prediction.
Experimental system: Adult male mice; anterior cingulate cortex slices with pharmacological stimulation, together with nerve-injury and inflammatory-pain models.
5 µM and 10 µM KA induced robust and persistent chemical LTD lasting for more than 3 h
Search scope: 9 queries, 5 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42734973 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42525787 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:38441858 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cutaneous afferents competitive inhibition) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (CNS afferent competitive inhibition) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cutaneous afferents sympathetic reflex) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (afferent competition systemic inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (lateral inhibition sensory competition) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (afferent summation sympathetic activation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In skin explants sharing medium, donor-matched immune cells and active complement, healing antibodies may cause body-wide inflammation. Confirmed antibody removal and restoration must reproduce the predicted loss and return of remote inflammation and local healing benefits; otherwise the mechanism is refuted.
Conclusion and evidence (3 findings)
No supplied study directly tests this prediction in the specified skin-explant system. The strongest component evidence is increased interleukin-6 secretion after stimulation of human blood immune cells with artificial antibody complexes, and biophysical demonstration that therapeutic antibodies form complexes of different sizes with interleukin-17A. Experiments with antibodies against complement component C5 additionally show that large-complex formation depends on antibody configuration, not simply component abundance. None establishes repair-promoting tissue antibodies, a nonmonotonic distant inflammatory response, coincident C1q binding, or the predicted depletion-and-restoration sequence. The verdict reflects component-only evidence and absence of a direct test, rather than mixed direct evidence or experimental refutation. Saturable mediator clearance and improved prediction of safe treatment overlap also remain untested.
Prediction being checked
In wounded skin explants sharing circulating medium, autologous immune cells and active complement, tissue-binding antibodies that promote local repair also generate circulating immune complexes that drive distant inflammation through complement and activating Fc receptors. Inflammation should peak at an intermediate antigen-to-antibody ratio alongside large C1q-binding complexes. Selective antibody depletion should reduce distant inflammation and slow repair; purified original antibodies should restore both effects, whereas Fc-free fragments with comparable antigen binding should not restore inflammation.
Conditions and limits of the evidence
The proposed system is skin explants; the hypothesis does not specify species. Available experiments concern purified human cytokine or complement proteins with therapeutic antibodies, engineered Chinese hamster ovary cells expressing human PD-1, and isolated human peripheral blood mononuclear cells. They do not establish systemic inflammation during simultaneous skin regeneration, safe treatment schedules, or human longevity benefits.
The experiment still needed
Use donor-matched skin explants and immune cells in shared circulating medium with verified active complement. Independently vary wound timing overlap and tissue-binding antibody concentration across antibody excess, equivalence and antigen excess. Measure released antigen, complex size, C1q binding, complement activation, distant cellular activation and local repair over time. Compare selective antibody depletion with mock depletion, purified-antibody restoration and Fc-free fragments matched for antigen binding; include complement and activating Fc-receptor blockade. Verify depletion, restored exposure, tissue viability and assay sensitivity before interpreting a negative result. Separately measure mediator disappearance after stopping input across initial concentrations, and prospectively compare a mass-balance model with total treated area for predicting inflammatory responses to different schedules.
Supports one part of the mechanism
The 2026 human blood-cell study found increased interleukin-6 secretion after overnight stimulation with streptavidin-biotin complexes of human immunoglobulin G1 or G2, compared with untreated and streptavidin controls. This supports inflammatory cytokine release in response to antibody complexes. The experiment used artificial complexes and did not test tissue repair, antigen-to-antibody titration, C1q binding, or selective antibody depletion and restoration.
Experimental system: Peripheral blood mononuclear cells from healthy human donors, cultured with artificial human immunoglobulin G1 or G2 complexes; cytokine experiments included 24 donors.
resulted in a significant increase in IL-6 secretion compared to the Untx and Strept control groups.
Supports one part of the mechanism
The 2025 interleukin-17A study used complementary biophysical methods and electron microscopy to demonstrate antibody-dependent complex architectures. Secukinumab predominantly formed smaller closed complexes, whereas other antibodies formed larger assemblies. This supports multivalent complex formation and its dependence on binding geometry. Complement recruitment, cellular inflammation and wound healing were not measured; their proposed connections remain speculative.
Experimental system: Purified recombinant human interleukin-17A mixed with secukinumab, ixekizumab, bimekizumab or CJM112, principally at equimolar antibody-to-cytokine-dimer ratios.
the four antibodies formed closed-chain immune complexes of varying sizes, morphologies, and relative abundance.
Challenges one part of the mechanism
The 2026 C5-complex study found only limited-stoichiometry complexes for the individual antibody mAb-A across three mixing ratios, while some antibody pairs formed large assemblies. This limits any assumption that changing antigen-to-antibody ratio alone guarantees large complexes: suitable binding geometry is also required. It does not refute the conditional skin hypothesis, and the study did not measure complement activation or inflammatory responses.
Experimental system: Purified human complement component C5 and recombinant therapeutic antibodies in buffered solution, assessed by flow field-flow fractionation with light scattering.
Additionally, no higher molecular weight complexes were detected for any sample under any of the tested stoichiometric ratios
Search scope: 9 queries, 4 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42645425 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:41392115 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:41111004 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Immunoglobulin immune complex formation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Ig immune complex formation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Antibodies cutaneous wound healing) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Immune complexes systemic inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Antigen antibody stoichiometry complement) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Cytokine clearance systemic inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
Human eccrine sweat ducts may retain altered placement of aquaporin water channels after repeated recovery cycles, returning water to tissue despite preserved sweat production. Failure to detect excess outward water transfer with sufficiently sensitive measurements would reject this hypothesis.
Conclusion and evidence (3 findings)
No direct test of this prediction was found in the supplied studies. None established repeated repair, normalized tissue stiffness and duct patency, then separately measured primary secretion and ductal water loss or tested osmotic rescue. The 2024 cholinergic-urticaria study found no dermcidin outside sweat glands, but protein retention cannot exclude selective aquaporin-mediated water transport. The 2025 polydatin experiments provide limited component evidence linking aquaporin-5 to sweating in mice, without locating water transport to the duct or determining its direction. The verdict reflects absent direct testing and indirect evidence, rather than mixed direct results or experimental refutation.
Prediction being checked
After repeated repair cycles, persistent redistribution of aquaporins in sweat-duct epithelial membranes increases water reabsorption through a patent duct despite preserved primary sweat production. Reducing the osmotic gradient should restore fluid output while duct calibre, secretory-cell calcium responses and cell numbers remain unchanged.
Conditions and limits of the evidence
The proposed mechanism concerns eccrine sweat ducts after repeated repair with restored patency and tissue mechanics; the hypothesis does not explicitly specify a species. Available evidence covers healthy human forearm sweating, human cholinergic urticaria and skin explants, and pilocarpine-stimulated mice with accompanying human sweat-gland cell cultures. It does not establish persistent ductal aquaporin redistribution, selective outward water flux or recovery of sweating under the proposed conditions.
The experiment still needed
Compare glands after documented repeated repair with matched controls after confirming normalized stiffness and patent ducts. Under identical direct stimulation, measure secretory-coil fluid production and duct outlet volume separately. Microperfuse intact isolated ducts at measured physiological osmotic gradients, quantify outward water flux and recovery of an impermeant tracer, and establish sensitivity sufficient to detect the water loss required to explain reduced output. Test rescue by reducing the gradient while monitoring duct calibre, secretory-cell calcium responses and cell numbers. Demonstrate persistent membrane redistribution of aquaporins and reverse it selectively in duct epithelium to establish causality. Absence of excess water flux within adequately narrow detection limits would contradict the prediction.
Related research
The 2024 cholinergic-urticaria study stained biopsies from seven patients and five controls after exercise provocation. Dermcidin remained within glands. This argues against detectable leakage of this sweat protein, but does not measure water permeability and cannot exclude selective water reabsorption. Repeated repair and preserved primary secretion were not established.
Experimental system: Human skin biopsies from patients with cholinergic urticaria and healthy controls after pulse-controlled ergometry.
no dermcidin signals in the tissue surrounding the sweat glands were detected
Supports one part of the mechanism
The 2025 mouse study reported reduced aquaporin-5 and ion-cotransporter abundance alongside fewer sweat spots after polydatin treatment. This provides limited component evidence connecting water-channel regulation with sweating. The drug also altered neural factors; neither duct-specific localization nor water-flux direction was measured. Unrandomized, unblinded experiments and inconsistent descriptions of sampling time and tissue site further limit interpretation. Nonsignificant drug effects in knockout mice alone do not prove aquaporin dependence.
Experimental system: Male wild-type and Aqp5-knockout mice given pilocarpine, with oral polydatin pretreatment; paw iodine–starch sweat assays and tissue molecular measurements.
Polydatin significantly downregulated the protein levels of AQP5 and NKCC1 in the sweat glands
Related research
The 2018 human experiment found increased glucose flux into sweat with citrate plus reverse iontophoresis compared with acetate in four participants. It demonstrates experimentally modifiable solute transport under an applied electric field. It does not isolate ductal transport, measure aquaporin-mediated water reabsorption or test an intact barrier retaining an impermeant marker.
Experimental system: Healthy human forearm skin with carbachol-stimulated sweating and citrate or acetate delivered by reverse iontophoresis.
Citrate produced significantly higher glucose fluxes compared to acetate at both the final treatment period (6) and the first recovery time point (7)
Search scope: 9 queries, 3 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:38731882 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:36902003 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:40880648 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (aquaporin 5 membrane redistribution) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (AQP5 membrane redistribution) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (AQP5 sweat secretion) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ductal water reabsorption hypohidrosis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eccrine osmotic water transport) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eccrine paracellular water permeability) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
The hypothesis proposes that neighboring regions controlling skin blood flow and sweating may release too much heat when activated together. No effect of spatial activation order, measured with sufficient precision, would reject it in favor of a shared timing or receptor mechanism.
Conclusion and evidence (4 findings)
No supplied study directly tests this spatial comparison under the required matched conditions or repeated environmental transitions. The closest experiment, the 2026 skin-capillary study, found persistent calcium activity and altered blood flow after endothelial connexin 43 deletion, with improvement after nifedipine. However, these interventions also changed activity duration, frequency and mean flow; sweating and temperature excursions were not measured. Human calorimetry documented post-exercise heat-flow overshoot but did not manipulate spatial activation. The evidence therefore provides component support and related observations, with neither direct confirmation nor an adequately controlled contradiction.
Prediction being checked
During repeated transitions between humid heat and dry cool conditions, restored skin vascular and sweating responses produce larger temperature excursions when simultaneously active regions are spatially clustered rather than interleaved, despite matched total secretion, mean blood flow, mean response delay and individual activation-threshold distribution. Spatially reordering activation reduces these excursions without shortening the mean delay.
Conditions and limits of the evidence
The claim concerns coupled cutaneous vascular and sweat-gland thermoregulation; the hypothesis does not explicitly name a species or define its stability measure. Available experiments cover mouse footpad sweating, mouse palmoplantar capillaries, thigh heat flow in five healthy young men and heat exchange from a sweating manikin. None establishes spatial inhibition between neighboring vascular-secretory units, destabilization after functional restoration or stabilization by spatially reordered activation.
The experiment still needed
Define the target species, restoration intervention and temperature-stability endpoint. In a randomized crossover experiment, compare clustered and interleaved activation of neighboring skin regions during repeated humid-hot to dry-cool transitions, verifying matched total secretion, mean blood flow, mean delay and threshold distribution. Measure spatial activation, local and core temperatures, evaporation and heat loss; control airflow, residual skin water and central thermal drive. Demonstrate that reordering activation reduces excursions while mean delay remains unchanged. Separately test whether neighboring activity suppresses recruitment beyond what shared central drive predicts. A precise equivalence result excluding a prespecified meaningful spatial effect would contradict the focal prediction.
Supports one part of the mechanism
The 2026 capillary experiment found persistent endothelial activity, increased blood-cell flux and vascular leakage after connexin 43 deletion; nifedipine reduced these abnormalities. This supports a role for intercellular communication in vascular dynamics. It does not isolate spatial arrangement at matched activity and flow. In controls, individual calcium events showed no apparent association with local flow changes, further limiting their interpretation as thermoregulatory activation.
Experimental system: Palmoplantar skin capillaries in anesthetized adult mice, endothelial connexin 43 deletion and topical calcium-channel inhibition.
Our findings show that loss of Cx43 increases plexus-wide Ca 2+ activity, enriching for a population of persistently active ECs.
Supports one part of the mechanism
The 2026 calorimetry study measured a transient post-exercise heat-flow increase in five men. This supports the existence of thermal transients, but blood-flow contributions were model interpretations without complementary perfusion measurements. There was no spatial activation manipulation, restoration intervention or humid-hot to dry-cool transition.
Experimental system: Skin over the vastus lateralis in five healthy men aged 20–23 during incremental cycling and recovery, with a calorimeter thermostat at 30°C.
after exercise cessation, the measured heat flow showed an abrupt recovery overshoot, with variable shapes across participants and measurements.
Related research
The 2026 manikin study validated heat-transfer simulations against measured heat flux and airflow. Its predictions of evaporation suppression concern interacting thermal and humidity-driven buoyancy. Experiments used uniformly controlled surface temperatures and saturated textile skin; human temperature changes were simulated. Neither biological activation patterns nor neighboring-unit inhibition was tested.
Experimental system: A segmented sweating thermal manikin in a climate-controlled enclosure, coupled to numerical heat-transfer and thermoregulation models.
Comparable agreement was observed for heat fluxes on individual body segments and near-skin air velocity measurements
Related research
The 2023 receptor-mutation study found reduced pilocarpine-evoked sweating without detected differences in sweat-gland innervation markers. This establishes a related sweating defect but does not identify altered spatial thresholds or neural connectivity as its cause. It tested neither functional restoration nor heat-loss stability.
Experimental system: Footpads of two-month-old mice carrying the human TrkA R649W mutation, tested with pilocarpine and iodine-starch imaging under anesthesia.
The iodine-starch sweat test revealed striking anhidrosis in TrkA R649W/m mice
Search scope: 9 queries, 4 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42616875 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42335226 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42632044 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Skin blood flow spatial inhibition) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (SkBF spatial inhibition) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Sweating evaporative cooling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Spatial alternation thermoregulatory stability) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Lateral inhibition asynchronous recruitment) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Thermoregulation delayed feedback oscillations) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
After heat acclimatization, ambiguous temperature and touch signals may sustain inappropriate sweating and blood flow. A crossover test would reject this mechanism if clearer signals change only perceived wetness while secretion and blood flow remain unchanged.
Conclusion and evidence (4 findings)
No direct test of this prediction was found in the supplied studies. Human experiments support interactions between thermal and tactile inputs in perception, but do not establish the proposed remote autonomic response after heat acclimatization. The closest contrary observation is the 2015 clothing experiment: perceived wetness changed while skin electrical conductance, used as a sweating indicator, and physical wetness showed no significant between-condition differences. This conference report neither established heat acclimatization nor measured remote vascular conductance, matched mechanical loading, or demonstrated sensitivity to exclude the predicted response. It therefore cannot refute the mechanism. Mouse neural-circuit and rat drying experiments provide only component evidence. The verdict reflects an absent direct test and unresolved controls, rather than mixed direct evidence.
Prediction being checked
In heat-acclimatized humans, improving the sensory distinction between effective sweat evaporation and warm sweat accumulation through congruent thermal and tactile cues changes sweating and cutaneous vascular conductance at an unstimulated site before heat balance changes. Equally intense incongruent cues do not produce this response, and improved discrimination subsequently reduces skin-barrier injury.
Conditions and limits of the evidence
The focal system is human sweating skin after heat acclimatization under sustained wetness and limited evaporative heat loss. Available human studies concern perception during exercise, brief skin stimulation, or altered thermal conditions, including multiple sclerosis. Rodent studies concern central heat-defense circuits or removal of externally applied water from fur. None establishes sensory-error-induced sweating, vascular restriction, or barrier injury in the focal conditions. These findings also do not establish that heat acclimatization is generally harmful.
The experiment still needed
A randomized crossover study should verify heat acclimatization and earlier sweating, then compare congruent and equally intense incongruent cues while matching mean skin temperature, actual evaporation, sweat composition, and total mechanical loading. Verify improved discrimination of evaporation versus accumulation, and measure sweat secretion and blood-flow-to-pressure conductance at a protected remote site before any heat-balance change. Include autonomic positive controls and precision sufficient to exclude a prespecified meaningful response. A perception-only change with tightly bounded unchanged autonomic responses would contradict the focal prediction; a selective early remote response would support it. Subsequent barrier measurements are needed to test the injury-reduction extension.
Challenges one part of the mechanism
The 2015 exercise study in ten men altered perceived wetness through clothing fit, while sweating-related electrical conductance and physical wetness showed no significant differences. This challenges an automatic coupling of wetness perception to sweating. It is a conference report with no remote blood-flow measurement, established acclimatization, or equivalence analysis, so it does not test the full prediction.
Experimental system: Ten men walking in tight or loose garments beneath a vapor-impermeable outer layer.
with no differences between TIGHT-FIT and LOOSE-FIT (p > 0.05).
Supports one part of the mechanism
Across three experiments with 36 participants, the 2025 study found reduced cooling-detection sensitivity with concurrent touch; the pooled comparison had p < 0.001. This supports thermal-tactile interaction in perception. Sweating, remote vascular conductance, wetness discrimination, and acclimatization were not tested.
Experimental system: Healthy adults receiving focal non-contact cooling and light touch on the hand dorsum.
This confirmed that sensitivity was reduced by touch
Supports one part of the mechanism
The 2020 mouse study found that silencing hypothalamus-projecting cholecystokinin neurons in the lateral parabrachial nucleus delayed tail warming, consistent with impaired vasodilation. This supports central neural control of heat-defense responses. Tail temperature was the vascular proxy; human sweating and thermal-tactile ambiguity were outside the experiment.
Experimental system: Adult male mice with targeted neural silencing during ambient warming.
The increase of T tail was significantly delayed when switching the T a from 30° to 35°C as compared to controls
Supports one part of the mechanism
The 2024 rat study found reduced grooming and shaking responses after facial local anesthesia compared with control injections. This supports a contribution of cutaneous sensory input to drying behavior. Blood-flow redistribution was explicitly unmeasured, and neither sweating nor the predicted remote autonomic response was tested.
Experimental system: Juvenile Long–Evans rats receiving externally sprayed water and facial local anesthesia.
Local anesthesia of dorsal facial skin with lidocaine reduces behavioral responses after head spray
Search scope: 9 queries, 6 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:39933581 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:37975151 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:24944222 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (wetness perception multisensory integration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (CNS thermotactile integration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (wetness perception thermoregulation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (sensory ambiguity sweating vasodilation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (multisensory integration autonomic regulation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cutaneous thermoreflex sweating vasodilation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In reconstructed skin and cultures from people aged 40-60 with intact TP53, stress order may slow recovery through insertion of dead-cell nuclear deoxyribonucleic acid (DNA). No stable insertions with sufficiently sensitive testing, plus a defect transferred only by cell-free matrix, would reject the hypothesis.
Conclusion and evidence (2 findings)
No direct test of this prediction was found in the supplied evidence. The 2001 oncogene-transfer study detected donor chromosomes and donor-recipient hybrid chromosomes in tumor-derived cells originating from p53-deficient mouse embryonic fibroblasts. This supports a possible transfer mechanism. However, wild-type recipient foci became senescent or died, and persistence of transferred DNA depended on selection in the tested settings. These observations challenge extrapolation to functional TP53 and persistence without clonal expansion, but do not refute the skin hypothesis. Stress order, daily phase, repair-gene disruption, recovery time and matrix-mediated alternatives were not tested. The full text of the 2026 human-cell DNA-transfer study was unavailable.
Prediction being checked
In reconstructed skin with functional TP53, changing the order of otherwise matched stresses relative to the daily recovery phase changes stable incorporation of dead-cell nuclear DNA into surviving dermal fibroblast chromosomes. These insertions disrupt repair genes and account for most of the resulting delay in recovery, independently of clonal expansion. Preventing incorporation should eliminate the sequence-dependent recovery deficit.
Conditions and limits of the evidence
The available primary experiments used rat embryonic fibroblast donors, wild-type or p53-deficient mouse embryonic fibroblast recipients, and tumors in immunodeficient mice. They concern oncogene transfer and selection-associated persistence. They do not establish functionally important insertion frequencies in dermal fibroblasts, reconstructed skin with functional TP53, normal resting skin, or any benefit for human lifespan.
The experiment still needed
A decisive comparison must connect stress order and daily phase to verified, persistent donor-recipient chromosomal junctions and delayed recovery in reconstructed skin with functional TP53, while total exposure and observation timing are matched. The deficit must remain with fibroblasts on fresh nonmineralized matrix, depend specifically on donor DNA rather than other debris, and have insertion-specific causal evidence from matched genetic backgrounds. The analysis must distinguish changes within existing cells from clonal selection and quantify whether insertions explain most of the recovery difference. Adequately sensitive absence of stable insertions together with transfer of the deficit exclusively through cell-free matrix would contradict the prediction.
Supports one part of the mechanism
The 2001 oncogene-transfer study detected donor chromosomes and hybrid chromosomes in metaphase preparations from recipient-derived tumors. This supports chromosomal retention and incorporation of donor material in that setting. It does not establish sequence-resolved insertion junctions, disruption of repair genes, or delayed skin recovery.
Experimental system: Oncogene-bearing rat embryonic fibroblast donors; p53-deficient mouse embryonic fibroblast recipients; recipient-derived tumors grown in immunodeficient mice.
revealed the presence of rat chromosomes as well as hybrid rat/mouse chromosomes.
Challenges one part of the mechanism
Wild-type recipient fibroblasts formed initial foci but subsequently became senescent or died. Separately, transferred oncogene signals disappeared from all examined p53-deficient clones after four weeks in culture, whereas selection supported persistence. These results challenge an assumption of readily sustained transfer with functional p53 and without selection. Transformation and clone propagation are different outcomes from insertion-mediated recovery impairment, so this is not a direct refutation.
Experimental system: Cultured wild-type and p53-deficient mouse embryonic fibroblasts exposed to apoptotic material from oncogene-bearing rat embryonic fibroblasts.
however, these cells became senescent or died during propagation.
Search scope: 9 queries, 1 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:11353826 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42275669 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (deoxyribonucleic acid chromosomal integration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (DNA integration apoptotic bodies) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (DNA genetic information storage) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (genomic integration repeated injury) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (horizontal gene transfer mammals) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (cell fusion genetic transfer) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:11353826 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In human skin–macrophage co-cultures, digestion of bacterial remnants may sustain late release of mature interleukin-1β after bacterial clearance. No dependence of that release on confirmed changes in digestion, with equal uptake of peptidoglycan and no viable bacteria, would refute the hypothesis.
Conclusion and evidence (1 findings)
The reviewed experiment concerns regulation of inflammatory cytokine production in cultured macrophages. It does not establish the proposed link between retained-particle processing and late inflammation in repaired skin.
Prediction being checked
Retained bacterial cell-wall material is proposed to sustain late inflammation through ongoing lysosomal processing after microbial clearance and barrier repair.
Conditions and limits of the evidence
Mouse bone-marrow-derived macrophages exposed to defined molecular stimuli; no repaired skin barrier or longitudinal retained-particle measurement.
The experiment still needed
The missing evidence concerns late inflammatory outcomes linked specifically to lysosomal processing in tissue after microbial clearance.
Related research
The authors distinguish cytokine gene expression from inflammasome-related processing. This provides interpretive context, not a direct test of retained debris in skin.
Experimental system: Cultured mouse macrophages.
without an increase in caspase-1 activation
Search scope: 9 queries, 1 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:41843675 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42054366 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42364103 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (peptidoglycan lysosomal degradation NLRP3) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PGN lysosomal degradation NLRP3) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (peptidoglycan bacterial cell wall) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (lysosomal degradation persistent inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (bacterial debris phagolysosomal processing) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (peptidoglycan NOD2 inflammatory signaling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In epidermal models and explants, phenol-soluble modulins alpha and bacterial lipoproteins acting through Toll-like receptor 2 may independently sustain damage after protease suppression. If either single block matches the joint block, the proposed redundancy is rejected.
Conclusion and evidence (4 findings)
No supplied study directly tests this conditional prediction. Experiments support modulin-induced keratinocyte activation and a contribution of TLR2 to inflammation and barrier dysfunction, but none combines verified protease suppression, cessation of scratching, unchanged microbial abundance, and separate versus combined pathway blockade. Contrary component evidence shows that a bacterial protease contributes to inflammation across an initially intact barrier, while modulin sensing can promote repair and bacterial clearance. These findings limit generalization but do not refute the specified post-scratching mechanism. The verdict reflects an absent direct test and unresolved controls, rather than mixed direct evidence or a null statistical result.
Prediction being checked
After scratching stops, with microbial proteases demonstrably suppressed and microbial abundance unchanged, phenol-soluble modulin alpha (PSMα) activity and bacterial lipoprotein signaling through Toll-like receptor 2 (TLR2) each suffice to sustain new inflammatory skin-barrier damage. Blocking either pathway alone leaves damage, whereas blocking both restores a predefined young-reference range; restoring either pathway restores damage despite continued protease suppression.
Conditions and limits of the evidence
The evidence concerns cultured human keratinocytes, human skin explants and equivalents, and mouse models of staphylococcal exposure, dry skin, and wounds. The claim does not specify host species or age. No study establishes the proposed redundancy in persistent dermatitis after scratching cessation or normalization to a young-reference range. Clinical efficacy and preservation of protective sensory responses remain untested.
The experiment still needed
The missing evidence is a direct factorial comparison of separate and combined pathway inhibition in the eligible post-scratching state, with verified microbial protease suppression, stable microbial abundance and composition, and sufficient activity of both pathways. It must distinguish newly occurring barrier injury from residual lesions and cytokine changes, use a predefined young-reference range, and establish pathway-specific reversibility while assessing protective sensory function.
Supports one part of the mechanism
The 2023 keratinocyte-sensing study found that PSMα3 stimulated interleukin-8 release and that formyl-peptide receptor 2 inhibition reduced this response. A TLR2 agonist also stimulated cytokine release. However, PSMα3 promoted gap closure, and receptor inhibition increased bacterial colonization in skin models. Cytokine activation therefore does not establish protease-independent damage or functional redundancy.
Experimental system: Primary human keratinocytes and N/TERT-1 cells; complementary human skin explant and tape-stripped mouse skin experiments.
We observed dose-dependent, significant inhibition of the FPR ligand-induced release of IL-8
Supports one part of the mechanism
The 2024 dry-skin study found reduced interleukin-33 expression and release of the cell-injury marker lactate dehydrogenase after TLR2 neutralization in infected keratinocytes. TLR2-deficient mice also had reduced transepidermal water loss. This supports a TLR2 contribution, but neither isolates bacterial lipoprotein sufficiency nor tests combined modulin blockade under protease suppression.
Experimental system: S. aureus-infected human KERTr keratinocytes and TLR2-deficient mice with experimentally delipidized skin.
blocking TLR2 signaling with a TLR2 neutralizing antibody attenuated both IL-33 expression and LDH release
Challenges one part of the mechanism
The 2023 S. epidermidis study found reduced inflammation after EcpA protease deletion despite similar bacterial burden. Additional modulin deletion further reduced some inflammatory outcomes. This challenges blanket protease independence, but concerns different modulins and initially intact mouse skin, rather than established injury after scratching cessation. Unsuccessful genetic complementation also limits causal attribution.
Experimental system: Mouse skin exposed to S. epidermidis 1457 and deletion mutants, with an initially intact stratum corneum.
the Δ ecpA and Δ psmδ Δ hld Δ ecpA mutants had decreased inflammation despite similar bacterial burden
Supports one part of the mechanism
The 2025 wound-repair study found that individual toxin or modulin deletions failed to restore keratinocyte migration to control levels, consistent with contributions from multiple bacterial products. It did not identify the proposed modulin/TLR2 pair, suppress microbial proteases, or measure new damage after scratching cessation. Migration and wound closure are distinct from the focal injury outcome.
Experimental system: Scratch-wounded primary neonatal human keratinocytes exposed to conditioned media from S. aureus and individual virulence-factor deletion mutants.
no individual deletion mutant restored NHEK migration to control or SaΔagr
Search scope: 9 queries, 6 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:41090347 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:38319737 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:37325619 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (phenol-soluble modulins alpha keratinocyte activation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PSMα keratinocyte activation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PSMα staphylococcal virulence) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PSMα TLR2 redundancy barrier dysfunction) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (bacterial lipoproteins toxins parallel inflammatory pathways) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PSMα keratinocyte membrane disruption) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In keratinocytes, inefficient coupling of adenosine triphosphate (ATP) use to protein repair by heat shock protein Hsp70 may bring damage forward without shifting warning onset. No change in time to damage after confirmed restoration of chaperone function would reject this as the main explanation.
Conclusion and evidence (4 findings)
No direct test of this prediction was found in the six supplied articles. The strongest component evidence comes from experiments restoring protein refolding by modifying human cochaperones and impairing aggregate removal by changing cochaperone mixtures. None measures keratinocyte damage onset together with sensory thresholds under matched heat, pressure, neural activity and protease activity. The studies also do not establish reduced productive folding per ATP consumed as the cause of that tissue-level discrepancy. Protection independent of Hsp70 supplies an alternative explanation requiring controls. The verdict reflects component support and an absent direct test, rather than mixed direct evidence or an informative experimental refutation.
Prediction being checked
In skin keratinocytes under combined heat and pressure stress, restoring productive coupling between adenosine triphosphate (ATP) hydrolysis and protein refolding by the heat-shock protein Hsp70 through altered cochaperone ratios delays tissue damage at matched tissue load, neural activity and protease activity, without shifting the sensory threshold. Accelerating ATP hydrolysis alone provides no protection, and the folding defect is reproducible in a cell-free system at fixed ATP and Hsp70 concentrations.
Conditions and limits of the evidence
The evidence concerns purified bacterial, yeast and human chaperone systems with model protein clients, plus human HEK293-family cells used to examine chaperone interactions. The hypothesis specifies keratinocytes but no species. Its predictions about combined tissue stress, itch relief, sensory warning and damage timing remain untested; these results establish no clinical protection or human lifespan benefit.
The experiment still needed
Use a defined skin model containing keratinocytes and sensory neurons under matched heat and pressure, with measured and matched neural and protease activity. First demonstrate impaired Hsp70-dependent refolding despite preserved ATP and Hsp70 abundance. Alter cochaperone ratios and verify rescue by measuring client capture, refolding and ATP consumption together. Compare this with increased hydrolysis lacking improved refolding, and control for Hsp70-independent aggregation prevention. Measure time from stimulus onset and sensory warning to predefined barrier damage or cell death, alongside sensory thresholds. Reproduce the biochemical defect and rescue with purified relevant proteins at fixed ATP and Hsp70 concentrations. A precise absence of delayed injury after verified rescue, with adequate assay sensitivity, would challenge the proposed primary explanation.
Supports one part of the mechanism
The human Hsp70 paralog study (2026) restored luciferase refolding by replacing the J-domain of DNAJA2 with that of DNAJB1. This experimentally links cochaperone compatibility to productive folding, but does not test skin injury timing or sensory thresholds.
Experimental system: Purified human HSPA6, engineered J-domain cochaperones and Hsp110 with chemically denatured firefly luciferase and ATP regeneration.
the DNAJB1-A2 chimera fully restored HSPA6-mediated refolding activity and performed similarly to DNAJB1
Supports one part of the mechanism
The mixed-class cochaperone study (2026) found that increasing defective DNAJA2 relative to functional DNAJB1 impaired luciferase recovery. Detectable cochaperone assembly persisted, and increasing Hsp70 abundance did not eliminate inhibition. This supports a role for productive complex composition, but neither ATP-use efficiency nor tissue protection was measured.
Experimental system: Purified human HSPA8, HSPH2, DNAJA2 and DNAJB1 variants acting on preformed heat-induced luciferase aggregates.
further reduced both the rate and final yield of luciferase reactivation
Supports one part of the mechanism
The myopathy-associated cochaperone study (2026) found impaired refolding with mutant yeast Sis1 at matched chaperone concentrations and supplied ATP. Separate assays showed that effects on Hsp70 ATP hydrolysis depended on client conformation. These experiments support cochaperone-dependent folding defects, but do not quantify folding per ATP consumed or demonstrate rescue in keratinocytes.
Experimental system: Purified yeast Sis1 variants and Ssa1 with heat-denatured luciferase; separate ATPase assays used Rnq1 monomers and amyloid conformers.
The results indicated that all LGMDD1 J-domain mutants were impaired in their ability to refold luciferase
Challenges one part of the mechanism
The tyrosine hydroxylase study (2025) demonstrated protection from aggregation by DNAJC12 without ATP or Hsp70. This challenges attribution of any cochaperone-mediated protection specifically to restored ATP coupling. It is an alternative mechanism in a different protein system, not a refutation of the keratinocyte prediction.
Experimental system: Purified human DNAJC12 and tyrosine hydroxylase, including the R202H variant; aggregation monitored at 37 °C.
DNAJC12 stabilizes and prevents aggregation of its client TH in an ATP-independent manner.
Search scope: 9 queries, 6 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42612003 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:28746847 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:40113792 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (heat shock protein 70 ATPase coupling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Hsp70 ATPase refolding coupling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Hsp70 protein folding) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (chaperone coupling keratinocyte injury) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (chaperones nonequilibrium ATP-driven refolding) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Hsp70 antiapoptotic keratinocyte protection) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
Selecting people with equal itch relief after treatment may make nerve suppression appear to shorten the time between warning and skin damage. The hypothesis predicts equivalent warning timing and estimated protective time margins in the full randomized analysis; a persistent causal effect would reject it.
Conclusion and evidence (2 findings)
No direct test of this prediction was found in the two supplied studies. The human nociception study (2019) establishes effects of Nav1.7 loss and pharmacological inhibition on sensory function and neuronal excitability. The diabetic-mouse study (2019) shows that methylglyoxal scavenging reduces itch and reverses thermal hypoalgesia, while Nav1.7 blockade reduces itch. Neither compares the two treatments using prespecified equivalence margins in all randomized participants and then repeats the analysis after selecting equal itch responders. Neither measures the warning-to-damage interval or tests the protease/Hsp70 prediction. The evidence is indirect, rather than conflicting direct evidence. Loss of protective pain with severe congenital Nav1.7 dysfunction does not refute the explicitly narrower hypothesis.
Prediction being checked
For a specified symptomatic itch-treatment regimen, reducing neuronal excitability and removing the tissue irritant produce equivalent warning times and estimated intervals between warning and tissue damage in an analysis of all randomized participants. An apparent disadvantage of neuronal suppression arises entirely from selecting participants with equal post-treatment itch improvement and changes with the selection rule. At fixed tissue loading, protease activity and Hsp70 function do not explain a persistent treatment difference.
Conditions and limits of the evidence
Available experiments concern humans with congenital SCN9A-related pain insensitivity, human stem-cell-derived nociceptors, and male mice exposed to methylglyoxal or with streptozotocin-induced diabetes. They do not establish treatment equivalence in people with itch, responses to escalating pressure, or protection against hidden tissue damage. The hypothesis does not specify the clinical population, symptomatic regimen, equivalence margins, or operational definition of Hsp70 productivity.
The experiment still needed
Specify the population and treatment regimen, then randomize before treatment and analyze all assigned participants, recording baseline sensory function and skin damage. Measure warning onset during standardized heat and pressure challenges and estimate the warning-to-damage interval using independently validated tissue-damage thresholds. Adequately precise confidence intervals must fall within prespecified equivalence margins. Repeat the analysis under several prespecified rules selecting equal itch improvement to test whether an apparent difference emerges and changes with selection. In parallel, compare protease activity, defined Hsp70 function, and damage under fixed tissue loading. A reproducible treatment effect outside the equivalence margins in the full randomized analysis would contradict the selection-only explanation.
Supports one part of the mechanism
The human nociceptor study (2019) found that PF-05089771 increased the current needed to initiate firing in control neurons, with no corresponding effect in Nav1.7-null neurons. This supports a mechanism for reducing neuronal excitability, but tests neither treatment equivalence nor selection by itch response.
Experimental system: Cultured human induced pluripotent stem-cell-derived nociceptors, comparing control and genetically Nav1.7-null cells during pharmacological treatment.
PF-05089771 increased the rheobase of control, but not Na V 1.7 KO, neurons
Supports one part of the mechanism
The diabetic-mouse study (2019) reports reversal of reduced heat sensitivity after methylglyoxal scavenging, measured by tail withdrawal from hot water. Separate experiments show reduced mechanical itch after scavenging or Nav1.7 blockade. These results support the biological relevance of irritant removal, but do not compare protection at equal itch relief or demonstrate selection bias. Tissue-damage timing was not measured.
Experimental system: Male mice with streptozotocin-induced diabetes; pharmacological interventions, touch-evoked scratching, and tail-withdrawal latency in 52 °C water.
significantly reversed diabetes-induced thermal hypoalgesia in mice
Search scope: 9 queries, 2 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42444496 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:30795902 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:27809268 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (voltage-gated sodium channel 1.7 collider bias) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Nav1.7 collider bias) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Nav1.7 protective pain) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (collider bias protective sensation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (posttreatment conditioning selection bias) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Nav1.7 inhibition hypoalgesia) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In reconstructed human epithelium, a final coordinated wave of extracellular signal-regulated kinase (ERK) activity may enable earlier functional readiness as it subsides. No effect of pulse order under confirmed ERK control would reject the hypothesis.
Conclusion and evidence (5 findings)
No supplied primary experiment directly tests this prediction. The strongest component evidence links ERK wave dynamics to collective migration in canine kidney cells (2025), humidity to ERK activation in epidermis (2026), and suppression of growth-factor signaling to keratinocyte differentiation (2026). None compares ordered versus shuffled pulses at matched coverage, humidity and cumulative ERK activity, measures recovery of friction tolerance, or tests withdrawal timed to the final wave and directional-wave rescue. Migration on hydrogels without observed ERK waves limits generalization but does not refute the conditional prediction. The verdict reflects absent direct testing and component-only evidence, rather than mixed direct results or an informative null experiment. The 2024 ligand-propagation study has an unavailable full text.
Prediction being checked
In repairing epithelium, at matched wound coverage, humidity and cumulative extracellular signal-regulated kinase (ERK) activity, a spatially coordinated final ERK wave followed by signal decay restores friction tolerance earlier than spatially shuffled local pulses. The optimal withdrawal time follows completion of that wave, shifts when propagation speed changes, and can be rescued after premature withdrawal by one correctly directed wave.
Conditions and limits of the evidence
The hypothesis concerns functional maturation of repairing epithelium during withdrawal of migration stimulation under controlled humidity; its species and anatomical site are unspecified. Available experiments involve canine kidney epithelial monolayers, human epidermal and corneal cultures, reconstructed human skin, and mouse epidermis or cutaneous wounds. Their migration, signaling, gene-expression and histological endpoints do not establish friction resistance, a clinically useful switching time, or benefit in human wounds.
The experiment still needed
Use a wounded stratified epithelial model with verified propagating ERK waves and a prespecified friction-resistance endpoint. Randomize spatially ordered final waves versus shuffled local pulses, matching wound coverage, humidity, per-cell pulse exposure and cumulative ERK activity, and verify the subsequent decay by live imaging. Compare withdrawal before, immediately after and later than wave completion. Independently alter propagation speed and test whether the optimal withdrawal time follows wave completion at matched coverage. After early withdrawal, compare rescue by one correctly directed wave with reversed or shuffled controls. Measure time to sustained friction resistance alongside barrier function, adhesion, closure and viability, with sufficient sensitivity to distinguish a meaningful benefit from equivalence; repeat across humidity conditions.
Supports one part of the mechanism
The 2025 migration study found that deleting the Ras activator SOS1 slowed migration, lengthened the ERK wave cycle and reduced propagation speed. This supports coupling between wave dynamics and migration, but neither final-wave withdrawal nor functional maturation was tested.
Experimental system: Madin-Darby canine kidney epithelial cells undergoing collective migration after release from confinement, with fluorescent signaling reporters and SOS1 knockout.
SOS1 depletion led to a reduced migration speed while maintaining intact directedness.
Supports one part of the mechanism
The 2026 humidity study showed that blocking the calcium-permeable channel TRPV4 attenuated low-humidity-induced ERK activation in reconstructed epidermis. This supports humidity-sensitive signaling, but wave excitability, wound repair and friction tolerance were not measured.
Experimental system: Reconstructed human epidermis exposed to approximately 15% relative humidity for 30 minutes after TRPV4-inhibitor pretreatment, compared with approximately 90% humidity controls.
TRPV4 inhibition by HC-067047 or GSK2193874 suppressed ERK and p38 phosphorylation
Supports one part of the mechanism
The 2026 protease study found impaired differentiation in skin equivalents lacking RHBDL2, which sheds a soluble epidermal growth factor receptor decoy and limits migration. This supports a signaling brake relevant to maturation. However, basal ERK phosphorylation was unchanged in the HaCaT knockdown experiments, and no final-wave mechanism was tested.
Experimental system: Human N/TERT keratinocytes with RHBDL2 knockout differentiated into three-dimensional skin equivalents; complementary signaling and migration experiments used HaCaT keratinocytes.
wild-type N/TERT keratinocytes achieved near-native differentiation, whereas differentiation of both RHBDL2-deficient clones was compromised
Supports one part of the mechanism
The 2026 corneal study found that reducing the RNA-binding protein G3BP1 suppressed migration and increased junctional proteins under negative pressure. This supports a possible migration-adhesion tradeoff. Junctional protein abundance does not establish mechanical readiness; stimulus withdrawal, ERK wave order and post-closure barrier recovery were not tested.
Experimental system: Cultured human corneal epithelial cells exposed to continuous pressure 125 mmHg below ambient, with G3BP1 knockdown and migration and protein measurements.
In addition, G3BP1 knockdown increased the expression levels of E-cadherin, p120-catenin, and ZO-1 in the HCEC cell line
Challenges one part of the mechanism
The 2026 hydrogel study observed ERK-dependent collective migration without evident ERK waves. This limits the idea that such migration universally requires waves. It does not refute the final-wave prediction: the substrate and conditions differed, imaging was spaced 15 minutes apart, and neither wave-order manipulation nor functional recovery was assessed.
Experimental system: Canine kidney epithelial monolayers migrating on Matrigel/type I collagen hydrogels, with a fluorescent ERK reporter, matrix-mechanics perturbations and MEK-pathway inhibition.
whereas the reported ERK wave wasn’t observed in our matrix hydrogel model
Search scope: 9 queries, 6 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:41020443 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42413715 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42748142 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (extracellular signal-regulated kinase waves) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK wave propagation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK keratinocyte migration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK waves epithelial maturation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (excitable signaling waves regeneration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK cell-autonomous signaling differentiation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In human keratinocyte models from donors aged 40–60 years, a brief phosphorylation pulse may favour differentiation proteins and restore friction tolerance sooner during continued migration. No causal benefit despite a confirmed change in translation would refute the hypothesis.
Conclusion and evidence (3 findings)
No supplied experiment directly tests this prediction. The psoriasis study (2026) and oral keratinocyte study (2025) support a contribution of cellular stress signaling to differentiation. The migration study (2025) demonstrates a separate, kinase-independent role of PERK in adhesion and wound closure, cautioning against attributing PERK perturbation effects solely to eIF2α phosphorylation. None combines stimulus withdrawal, humidity adjustment and a controlled phosphorylation pulse with measurements of selective translation and joint functional recovery. The verdict reflects component evidence and absence of a direct test, rather than mixed direct evidence or an informative negative test.
Prediction being checked
In wounded organotypic epithelium competent for selective synthesis of differentiation proteins, a brief pulse of phosphorylation of translation initiation factor subunit eIF2α accelerates joint recovery of wound closure, barrier function and friction tolerance despite continued migration stimulation and maintained migration speed. Blocking the pulse eliminates the benefit of stimulus withdrawal with moderate humidity adjustment. These effects persist with matched tissue hydration, applied shear and hemidesmosome dynamics; earlier or prolonged pulses delay closure.
Conditions and limits of the evidence
The evidence covers mouse psoriasis-like skin, primary mouse keratinocytes, human HaCaT cells, differentiated human NTERT keratinocyte monolayers and human oral keratinocyte cultures. These systems do not establish a useful stimulus-withdrawal window in wounded organotypic tissue. Monolayer fragmentation resistance is not equivalent to recovery of tissue friction tolerance. Clinical wound-healing benefits remain beyond the evidence.
The experiment still needed
A controlled organotypic wound study should independently compare continued versus withdrawn migration stimulation, humidity conditions and a brief eIF2α phosphorylation pulse versus pulse blockade. Establish selective differentiation-protein translation before testing the proposed window, and verify phosphorylation, global protein synthesis and ribosome-associated messenger RNAs. Measure time until closure, barrier recovery and friction tolerance are all achieved, alongside migration speed and hemidesmosome dynamics, with hydration and actual shear matched. Include earlier and prolonged pulses, viability controls and adequate sensitivity. Pulse-induced acceleration during continued stimulation plus loss of the withdrawal benefit after blockade would support the claim; a well-powered absence of these effects despite verified translation changes would contradict it.
Supports one part of the mechanism
In the psoriasis study (2026), pathway inhibitors partially reversed differentiation-marker changes induced by tunicamycin or brefeldin A in primary mouse keratinocytes. This supports a partial contribution of the unfolded protein response to differentiation. It does not demonstrate a brief eIF2α pulse, selective translation or accelerated mechanical recovery.
Experimental system: Primary mouse keratinocytes exposed to endoplasmic-reticulum stress inducers and inhibitors of the IRE1 or PERK signaling pathways.
While UPR blockade partially reversed the pro-differentiation effects of TM or BFA, significant improvement remained
Related research
In the migration study (2025), kinase-inactive PERK restored collective migration in PERK-deficient keratinocytes, whereas deletion of its cytoplasmic region did not. PERK loss also increased adhesion and monolayer resistance to fragmentation while impairing closure. These results identify an alternative adhesion mechanism and a mechanical-strength/migration tradeoff, but do not refute a brief eIF2α pulse under the proposed organotypic conditions.
Experimental system: Differentiated human NTERT keratinocyte monolayers studied using scratch closure, PERK deletion and rescue, substrate-detachment assays and mechanical fragmentation after dispase release.
These results indicate that the kinase activity of PERK is dispensable for KCCM
Supports one part of the mechanism
The oral keratinocyte study (2025) reports that reducing PERK, GCN2, ATF4 or CHOP expression decreased spontaneous differentiation in uninfected cells, assessed through differentiation-marker immunoblots. This supports a contribution of integrated stress signaling under growth-factor restriction. It does not test a transient translation switch, migration-stimulus withdrawal or functional wound recovery.
Experimental system: Uninfected, telomerase-immortalized human oral keratinocytes cultured below confluence without supplemental growth factors, with targeted gene-expression knockdown.
each decreased the amount of spontaneous differentiation in uninfected NOKs cells
Search scope: 9 queries, 3 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:41765076 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42031169 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39951426 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eukaryotic translation initiation factor 2 alpha phosphorylation selective translation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eIF2α phosphorylation selective translation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (eIF2α keratinocyte differentiation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (selective translation epidermal mechanical integrity) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (integrated stress response epidermal maturation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (mTOR translation keratinocyte differentiation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
Brief secretion by a person’s own senescent dermal fibroblasts may restore aging skin’s full function without replacing its cells. The claim fails if benefits only close wounds, vanish after the cell pulse, or fail to include sensation and heat release; suitability requires ten years of sustained recovery.
Conclusion and evidence (2 findings)
No direct test of this prediction was found in the supplied studies. The 2014 wound-healing experiment provides component evidence that endogenous senescent cells and their secreted platelet-derived growth factor AA promote mouse wound closure; the article carries a 2026 expression of concern. The 2026 plasma experiment reports dermal remodeling after a different intervention. Neither tests transient autologous senescent-cell transplantation, persistence of all specified functions after cell clearance, or the ten-year comparative outcome. This is indirect component evidence, not mixed direct evidence or an informative refutation. The complete-response threshold, eligibility criteria and alternative therapy are also insufficiently specified to determine how many therapies qualify.
Prediction being checked
With fixed repeat treatment and mandatory care, transient autologous senescent dermal fibroblasts alone restore resident basal keratinocytes, dermal fibroblasts, follicular and eccrine epithelial cells and their interactions with nerve endings, with 0% direct replacement of these populations. Barrier, mechanical, secretory and sensory benefits persist after the introduced cells disappear; removing them before secretion prevents these benefits. Only this therapy meets the prespecified complete-response threshold in the original randomized population and maintains recovery for ten years after its first joint confirmation, while satisfying risk and feasibility requirements.
Conditions and limits of the evidence
The evidence concerns acute dorsal skin wounds in mice, cultured mouse fibroblasts, peroxide-treated human dermal fibroblasts and aged male mice given human leukocyte-rich platelet-rich plasma. It does not establish integrated human skin regeneration, functional follicular or eccrine recovery, restored innervation, durable post-clearance benefit, long-term safety or superiority over the proposed alternative and standard care.
The experiment still needed
First specify the target population, complete-response criteria, response-rate threshold, alternative therapy, repeat schedule and risk limits. A controlled mechanistic study must verify introduced-cell disappearance, distinguish resident-cell recovery from replacement, and compare removal before versus after secretion while measuring barrier integrity, mechanics, sweating and heat loss, follicular function and sensation. The full prediction then requires an adequately powered randomized comparison of both defined therapies and standard care, retaining the original randomized denominator and following jointly confirmed recovery for ten years.
Supports one part of the mechanism
The 2014 wound-healing study reports that recombinant platelet-derived growth factor AA restored wound-closure kinetics in mice lacking both senescence-associated cell-cycle inhibitors. Senescent-cell depletion and conditioned-medium experiments also support a secreted-factor contribution to myofibroblast formation. These experiments address acute repair, not the proposed transplantation or lasting sensory and secretory restoration. The supplied article carries an expression of concern, rather than a retraction.
Experimental system: Acute dorsal skin wounds in p16/p21 double-knockout mice; related experiments used p16-3MR mice and cultured mouse fibroblasts.
topical treatment with recombinant PDGF-AA rescued the delayed wound healing kinetics of p16/p21 DKO mice
Supports one part of the mechanism
The 2026 plasma study reports increased collagen deposition and an instrument-derived elasticity measure four weeks after treatment, with five mice per group. This supports the limited proposition that an injected biological preparation can alter aged dermal tissue. It used human leukocyte-rich platelet-rich plasma, not senescent fibroblasts. It neither established causal necessity of the proposed chemokine pathway nor tested cell clearance, integrated skin function or long-term persistence.
Experimental system: Sixteen-month-old male C57BL/6 mice receiving intradermal human plasma, assessed after four weeks; accompanying cultures used peroxide-treated human dermal fibroblasts.
Skin elasticity, measured using a skin analyzer, was increased in L-PRP-treated aged mice compared with saline controls
Search scope: 10 queries, 2 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:25499914 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:29752867 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42113675 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (platelet-derived growth factor-AA signaling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PDGF-AA paracrine signaling) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PDGF-AA wound healing) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (senescent fibroblasts skin rejuvenation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (transient senescence paracrine regeneration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (fibroblast engraftment skin regeneration) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:25499914 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In recovering skin models from donors aged 40–60 years, wet friction during synchronized cell division may cause chromosome errors and delayed barrier decline. Damage in isolated outer skin that precedes division errors and persists despite their verified prevention would favor the surface-integrity rival.
Conclusion and evidence (3 findings)
No supplied study directly tests this prediction. The 2019 keratinocyte study provides the strongest component evidence: Par3 loss impaired cellular contractility, increased mitotic errors and DNA-damage signaling, and promoted differentiation; restoring contractility rescued these defects, while blocking mitosis reduced damage signaling. However, these were mouse experiments involving genetic and pharmacological perturbations. The 2024 confined-migration study demonstrates mechanically induced segregation errors in cancer cells. Neither study tests circadian synchronization, wet friction, donor-age eligibility or delayed functional skin-barrier failure. The verdict reflects indirect component support and absence of a direct test, rather than mixed direct evidence or an informative negative experiment.
Prediction being checked
In healing organotypic skin from donors aged 40-60, stronger circadian synchronization concentrates basal keratinocyte mitoses, making equal wet friction more damaging at the mitotic peak than outside it. Despite matched initial permeability, hydration and lipid packing, peak exposure causes chromosome segregation errors, micronuclei and daughter-cell DNA damage, followed by premature differentiation and delayed barrier deterioration. Moving exposure outside the peak or briefly delaying mitotic entry, with complete release before subsequent recovery, prevents late damage despite slower early closure.
Conditions and limits of the evidence
Relevant experiments involve mouse epidermis and neonatal mouse keratinocytes, human cancer cell lines migrating through microchannels, and mammary epithelial cells with altered polarity proteins. Other supplied work models spindle orientation or manipulates cortical actin in Drosophila. These findings establish aspects of cell-division mechanics, but do not establish the proposed mechanism in healing human skin, its dependence on circadian phase, or protection from rescheduling sweat and friction.
The experiment still needed
Use paired healing organotypic skin cultures from multiple donors aged 40-60. Verify that stronger circadian synchronization narrows the mitotic peak, then randomize equal sweat exposure and frictional work to peak versus off-peak phases while matching heat loss, starting permeability, hydration and lipid packing. Track basal-cell divisions, lagging chromosomes, micronuclei, daughter-cell DNA damage and differentiation, followed by barrier permeability over several days. Include a brief reversible mitotic-entry delay, verify washout and resumed cycling before recovery, and measure both early closure and late barrier function. Test isolated stratum corneum in parallel. Damage preceding mitotic errors and persisting despite verified prevention of those errors would favor a direct surface-barrier mechanism. Use donor-level replication, sensitive positive controls and confidence intervals capable of excluding a biologically meaningful effect.
Supports one part of the mechanism
The 2019 study linked Par3 loss to reduced contractility, aberrant divisions, aneuploidy and premature differentiation. Restoring Rho/myosin activity rescued mitotic fidelity and differentiation; inhibiting mitotic entry reduced activation of the DNA-damage-response kinase ATR. This supports a mechanics-mitosis-damage pathway. The inhibitors were applied for 48 hours, without the proposed brief exposure and washout test, and delayed barrier permeability after wet friction was not measured.
Experimental system: Epidermal Par3-knockout mice examined at postnatal day 100; primary keratinocytes isolated from newborn mice, including stratified Transwell cultures.
mitotic block was able to significantly reduce the increased ATR activity in Par3-deficient cells
Supports one part of the mechanism
Live imaging in the 2024 study showed abnormal spindle organization, chromosome segregation and micronucleus formation during division across constrictions, despite a functional spindle checkpoint. This directly supports mechanical disruption of mitosis in the tested cancer cells. It does not test skin-barrier recovery, wet friction or circadian timing.
Experimental system: Human U2OS osteosarcoma and HeLa cervical cancer cells migrating through microchannels with constrictions; straight channels served as controls.
cells undergoing mitosis inside or immediately after exiting constrictions displayed disorganized spindles and metaphase plates
Supports one part of the mechanism
The 2023 annexin study found chromosome segregation defects after annexin A1 depletion in mammary epithelial cells, alongside altered cortical actin and spindle dynamics. Separate mouse mammary cultures developed abnormal architecture. This supports a role for cortical organization in faithful division, but does not establish genomic damage as the cause of delayed skin-barrier failure.
Experimental system: Human MCF-10A mammary epithelial cells with annexin A1 depletion; three-dimensional primary mammary epithelial cultures from pregnant mice.
ANXA1 knockdown results in chromosome segregation defects in ~32% of cells
Search scope: 9 queries, 5 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:31358743 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:40409259 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:38990945 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Partitioning-defective 3 mitotic errors) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PAR3 mechanics mitosis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (PAR3 epidermal homeostasis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Circadian mitosis barrier repair) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Mechanical stress chromosome missegregation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Stratum corneum lipid defects) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In human skin with an immune component, restored lipids may feed Staphylococcus aureus and prolong deeper damage despite normal water loss and antimicrobial defense. Confirmed fatty-acid uptake without an interaction between lipid restoration and bacterial lipid use would refute this causal role.
Conclusion and evidence (4 findings)
No direct test of this conditional prediction was found in the supplied full texts. The 2023 lipid-utilization study demonstrates incorporation of external fatty acids dependent on fatty acid kinase FakA, and the 2026 skin-chemical study reports increased culture optical density with palmitate. Neither connects restored epidermal lipids to viable bacterial expansion and dermal injury in human skin. Contrary component evidence shows growth inhibition by some fatty acid mixtures and altered toxin activity after FakA disruption. Thus, the verdict reflects an absent direct test with context-dependent component evidence, rather than mixed direct tests or an informative null result.
Prediction being checked
During repeated repair of aged human skin with an immune component, physiological lipid replenishment increases fatty acid incorporation into Staphylococcus aureus phospholipids, net viable bacterial growth and subsequent dermal damage despite matched water loss, hydration, pH and ionic strength, normal keratinocyte secretion and preserved antimicrobial peptide activity. The additional growth and damage depend on bacterial utilization of external fatty acids, disappear when that function is disrupted and return after complementation; normalizing ions alone does not remove them.
Conditions and limits of the evidence
The relevant experiments concern bacterial cultures, purified proteins and media containing defined fatty acids or serum. Human serum supplementation is not a human skin model. None examines repeatedly repaired aged skin with immune cells, matched barrier function and verified secretion and antimicrobial peptide activity. The evidence does not establish the safety or harm of clinical lipid replenishment, prevention of recurrent dermal injury or any lifespan effect.
The experiment still needed
A decisive study needs a factorial comparison of lipid replenishment and matched control in an immune-containing aged human skin model, using bacteria with intact, disrupted and restored external-fatty-acid utilization. It must trace replenishment-derived isotope into bacterial phospholipids, measure net viable bacterial increase and subsequent dermal injury, and verify the stated barrier and immune conditions throughout repair. The analysis must isolate the replenishment-by-utilization interaction from baseline growth, toxin and protease effects. An ion-normalization comparison must preserve lipid flux. An adequately sensitive absence of the predicted interaction despite verified uptake in competent bacteria would contradict the proposed causal mechanism.
Supports one part of the mechanism
The 2023 lipidomics experiments found serum-derived fatty acids in bacterial lipids and blocked their incorporation by deleting fakA. This supports the uptake component. The same study found growth inhibition with an unsaturated fatty acid mixture, partly relieved by α-tocopherol, so incorporation alone does not establish a growth advantage. Skin repair and dermal damage were not measured.
Experimental system: S. aureus USA300 LAC and isogenic mutants cultured with human serum, defined lipids, albumin or fatty acid mixtures.
the Δ fakA mutant prevented the incorporation of eFAs into the bacterial membrane
Supports one part of the mechanism
The 2026 skin-chemical study found higher culture optical density with palmitate and changes in phospholipids and protease production. This supports a possible lipid-dependent growth response. Optical density does not establish net viable bacterial expansion, and the study did not test whether phospholipid incorporation caused the increase or subsequent tissue injury.
Experimental system: S. aureus USA300 and S. epidermidis M23864:W2 in broth, including pH 5.5 conditions with palmitic and palmitoleic acids.
palmitic acid promoted a higher cell density (OD 600 ) for S. aureus
Challenges one part of the mechanism
The 2024 kinase study measured α-toxin-associated hemolysis and linoleate susceptibility in fakA mutants and complemented strains. Loss of FakA changed both phenotypes. This challenges interpreting a FakA-dependent injury difference solely as loss of lipid nutrition: altered toxin activity and fatty acid resistance are competing explanations. It does not refute the skin-specific prediction.
Experimental system: Purified S. aureus kinase proteins, bacterial growth assays with linoleic acid and hemolysis assays on rabbit blood agar.
the fakA mutant showed a lack of α-toxin activity compared to the wild-type strain
Challenges one part of the mechanism
The 2024 prophage-lipid study found impaired growth after fakB1 disruption during exposure to a linoleate-containing diglyceride, consistent with a protective role for fatty acid handling. Other experiments linked increased linoleate incorporation to toxicity and delayed antibiotic adaptation. These results challenge a uniformly growth-promoting interpretation of lipid uptake, but concern defined lipid exposure rather than repaired human skin.
Experimental system: S. aureus USA300, Newman derivatives and repaired fakB1 strains in broth with defined lipids or mouse/bovine serum; some assays included AFN-1252.
the growth of the fakB1 mutant was strongly impaired compared to the wild-type strain
Search scope: 10 queries, 6 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:33753501 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42017772 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:38014966 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (fatty acid kinase A exogenous fatty acid incorporation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (FakA exogenous fatty acid incorporation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (FakA phospholipid biosynthesis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (fatty acid incorporation skin barrier repair infection) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (bacterial host lipid assimilation infection) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (Staphylococcus aureus de novo fatty acid synthesis infection) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:33753501 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In human skin, temporary loss of neurokinin receptor NK1 sensitivity could weaken repeated vascular responses while sweating continues. Unchanged vascular responses to identical repeated inputs, with heat loss normalizing only after timing or spatial correction, would count against the hypothesis.
Conclusion and evidence (2 findings)
No direct test of this prediction was found in the supplied studies. The 2024 artery study supports a contribution of neurokinin-1 receptors to vasorelaxation in rats. The 2026 cell study demonstrates history-dependent calcium signaling after substance P exposure, but uses unequal successive doses and one recovery interval. Peak signaling recovered with the full-length receptor alone, whereas sustained signaling remained attenuated; coexpression of the truncated variant impaired subsequent responses further. These are component findings in different systems, not direct supporting or contradictory tests of interval-dependent cutaneous vasodilation, preserved sweating or heat-loss instability.
Prediction being checked
During repeated transitions between humid heat and dry cool conditions, reversible neurokinin-1 receptor desensitization selectively weakens cutaneous vasodilation while muscarinic sweating remains active. After standardized initial rest, shortening the interval between identical stimuli should reduce the second-to-first vascular amplitude ratio at fixed temperature; sufficient recovery should restore it, with receptor-bypassing responses preserved. Advancing stimulation without extending recovery should not correct the impairment.
Conditions and limits of the evidence
Available experiments concern isolated mesenteric arteries from male Wistar rats and engineered human HEK293 cells; the cell study also examines A549 lung carcinoma cells. Neither study measures human cutaneous vascular responses, sweating or heat loss during repeated humid-heat/dry-cool transitions. Receptor phosphorylation as a memory substrate and stabilization through recovery-matched timing remain untested here.
The experiment still needed
In human skin, randomize intervals between identical local substance P or controlled neural stimuli after standardized rest, holding local temperature constant. Measure first and second vascular amplitudes, response latency and sweating, with adequate precision to detect a meaningful decrement. Include a neurokinin-1-bypassing vasodilator control and receptor-specific measurements or perturbations to distinguish receptor desensitization from reduced transmitter release. Then test repeated humid-heat/dry-cool transitions, comparing longer recovery with timing advancement at the same short interval and measuring actual heat loss.
Supports one part of the mechanism
The 2024 wire-myography experiments found that neurokinin-1 receptor blockade reduced calcium-evoked relaxation of precontracted arteries. This supports receptor participation in vascular relaxation. They did not test repeated matched stimuli, recovery intervals, skin vessels or sweating; capsaicin pretreatment addressed sensory nerve function rather than specifically demonstrating neurokinin-1 receptor desensitization.
Experimental system: Isolated first-order mesenteric arteries from male Wistar rats, precontracted with U46619 and exposed to increasing extracellular calcium at 37°C.
NK1 receptor blocker L733,060 but not the CB 1 receptor blocker SR141716A reduces [Ca 2+ ] o ‐induced vasorelaxations.
Supports one part of the mechanism
The 2026 experiment applied 100 nM substance P for 10 minutes, washed cells, allowed one hour of recovery and challenged them with 1 nM substance P while inhibiting protein synthesis. With the full-length receptor alone, peak calcium-reporter activity was comparable to vehicle-pretreated controls, but sustained activity was reduced. The truncated variant further impaired subsequent signaling. This supports stimulus-history effects on receptor signaling, while preserved peak activity limits a general amplitude-loss interpretation. No interval series or vascular response was measured.
Experimental system: Transfected human HEK293 cells expressing full-length neurokinin-1 receptor alone or together with its truncated splice variant, assessed with a luminescent calcium reporter.
the sustained luciferase activity was significantly attenuated in SP‐pretreated cells compared to that in vehicle‐pretreated cells.
Search scope: 9 queries, 2 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:40400289 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:11226146 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:2445407 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (neurokinin-1 receptor desensitization) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (NK1 desensitization) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (NK1 cutaneous vasodilation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (receptor desensitization thermoregulation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (GPCR internalization resensitization) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (neuropeptide depletion vasodilatory tachyphylaxis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In organotypic skin, correlated signals through extracellular signal-regulated kinases (ERK) may prolong repair. Reject the mechanism if changing signal correlation at matched activity leaves function unchanged, or if the load-order effect persists after repeated signals stop completely.
Conclusion and evidence (4 findings)
No direct test of this prediction was found in the supplied studies. The strongest related evidence is the 2025 airway experiment: cytokine-induced ERK clusters accompanied reduced epithelial electrical resistance, and receptor inhibitors reduced cluster occurrence. However, the barrier association was correlational, in airway rather than skin, and spatial coordination was not manipulated at matched signaling activity. Skin studies address proliferation, wound closure, or photodamage under different interventions. None establishes a multiple-source integration rule, persistence after mechanical relaxation, dependence on continuing signals, or microbial pattern rescue. The verdict reflects indirect component evidence and absence of the decisive experiment, rather than mixed direct evidence or an informative negative test.
Prediction being checked
In organotypic skin after complete mechanical relaxation following washing and friction, spatially coordinated recurrent extracellular signal-regulated kinase (ERK) activity delays barrier recovery and increases reinjury through integration of signals from multiple neighboring epithelial sources. Dispersing those signals should improve both outcomes while preserving activated-cell number, pulse amplitudes and durations, integrated activity, and cellular organization. The load-order effect requires ongoing signaling; microbial effects should be mediated by the spatial pattern and reversed by restoring it.
Conditions and limits of the evidence
The focal system is organotypic skin subjected to controlled washing and friction, with complete mechanical relaxation verified before signaling manipulation. The hypothesis does not specify species. Available experiments concern human airway cultures, human and mouse keratinocytes, mouse wounds and psoriasis-like lesions, UV-exposed guinea pig skin, and human cervical cancer spheroids. These systems do not establish the proposed skin-barrier mechanism. The adipogenesis preprint's full text was unavailable.
The experiment still needed
Randomize organotypic skin across washing/friction orders at equal cumulative exposures, verify complete mechanical relaxation, then impose clustered versus dispersed ERK pulses with matched activated-cell counts, amplitude distributions, durations, and integrated activity. Verify unchanged cellular organization and measure barrier recovery by permeability or water loss, followed by standardized reinjury. Independently vary the number and coincidence of neighboring signal sources to establish the integration rule. Include verified cessation of recurrent signaling and microbial perturbation followed by restoration of the original spatial pattern. Prespecify meaningful effect bounds and sufficient independent tissue replicates so that a null result can exclude the predicted effect.
Supports one part of the mechanism
The 2025 airway study linked ERK-cluster frequency to reduced barrier resistance in differentiated primary cultures. In HBE1 cells, blocking the epidermal growth factor receptor or interleukin-6 receptor reduced cytokine-induced clusters. This supports receptor-dependent spatial signaling and a barrier association, but does not isolate spatial correlation as the cause of delayed skin repair.
Experimental system: Differentiated primary human tracheobronchial epithelium at an air-liquid interface; HBE1 bronchial epithelial cells for receptor inhibition.
we observed a significant negative correlation between SPREAD frequency and the corresponding epithelial resistance in the same samples
Supports one part of the mechanism
The 2026 psoriasis study used pathway inhibitors to suppress increased proliferation after depletion of the signaling inhibitor SPRED1. This supports ERK involvement in excessive keratinocyte proliferation. It does not test recurrent spatial waves, signal integration between neighbors, or functional barrier maturation.
Experimental system: Cultured human keratinocytes with SPRED1 depletion and pharmacological pathway inhibition.
PD98059/SCH772984 suppressed the enhanced proliferation in SPRED1 -knockdown cells
Supports one part of the mechanism
The 2026 laminin study found that trametinib reduced ERK phosphorylation and nerve growth factor abundance in mouse keratinocytes; separate nerve growth factor knockdown experiments reduced scratch closure. This supports a repair-associated signaling component, but neither tests spatial coordination nor establishes that ongoing ERK delays barrier recovery.
Experimental system: Immortalized mouse keratinocytes expressing integrin α3β1, treated with trametinib; separate scratch assays after nerve growth factor knockdown.
Concomitant with ERK inhibition, we observed reduced NGF level
Supports one part of the mechanism
The 2026 local-heating study observed delayed ERK activation in neighboring tumor cells, consistent with signal propagation. The propagation mechanism and ERK causality for cell fate were unresolved. Heating also altered activation frequency and duration, so this was not a matched-activity test of spatial coordination or skin-barrier recovery.
Experimental system: Human HeLa cervical cancer spheroids exposed to laser-induced heating of gold nanostars, with live ERK biosensor imaging.
These variations indicate a discrepancy in the timing of ERK activation among neighboring cells.
Search scope: 8 queries, 6 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42413715 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39556370 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (extracellular signal-regulated kinase synchronization) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK paracrine synchronization) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK epidermal repair) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK waves repair termination) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (epithelial signaling spatial synchrony) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (ERK sustained activation differentiation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In skin cleared of microbial components, rapid barrier restoration may cause extra irreversible mechanical work, cell damage and prolonged inflammation. Different measured dissipation with unchanged damage and inflammation would reject the proposed causal link.
Conclusion and evidence (3 findings)
No direct test of this prediction was found in the supplied articles. The 2026 bandage study experimentally links strain unloading to reduced inflammatory signaling in fibroblast cultures, supporting a component of the mechanism. Its animal experiments also show faster healing alongside reduced inflammatory markers, challenging a general claim that accelerated closure necessarily worsens inflammation. Neither study establishes removal of microbial components or compares closure schedules with matched final barrier function while measuring tissue energy dissipation, cell damage and inflammation duration. The verdict reflects indirect evidence and an absent decisive experiment, not mixed direct tests or a demonstrated null effect.
Prediction being checked
In repairing epithelial tissue cleared of microbial components, rapid closure causes greater irreversible mechanical energy dissipation, cell damage and longer inflammation than gradual closure achieving the same final barrier function. At equal duration, a recovery schedule approaching constant thermodynamic speed reduces these outcomes relative to abrupt changes. Repeated wetting amplifies the effect through altered tissue viscoelasticity.
Conditions and limits of the evidence
Evidence covers splinted skin wounds in nondiabetic and diabetic mice; acute skin wounds treated with contractile bandages in rats and pigs; and mouse NIH 3T3 fibroblasts or human HaCaT keratinocytes in collagen constructs. These systems do not establish the proposed mechanism in epithelial tissue verified free of microbial components under repeated wetting. Human therapeutic benefit and the optimal sequence of infection control, barrier repair and inflammation resolution remain beyond the evidence.
The experiment still needed
Use a repairing epithelial tissue model capable of an inflammatory response, verify microbial-component clearance, and measure stress relaxation before randomizing rapid versus gradual closure to equivalent final barrier function. Separately compare abrupt and near-constant-thermodynamic-speed schedules of equal duration, with a prespecified measurable definition of that speed. Include repeated-wetting and unwetted groups. Measure tissue force and deformation to separate dissipated work from stored elastic energy, then track cell injury, endogenous inflammatory signals, inflammation resolution and barrier permeability. Control peak loading, perfusion and material effects. A verified dissipation difference with sufficiently precise equivalence in injury and inflammation would contradict the proposed causal link.
Supports one part of the mechanism
The 2026 bandage study compared constant 10% and 20% strain with a 10%-20%-10% sequence. Unloading reduced focal adhesion kinase and inflammatory signaling in fibroblasts. This supports mechanical regulation of inflammation, but the experiment did not compare recovery speeds or measure dissipated work, cell injury or inflammation duration.
Experimental system: Mouse NIH 3T3 fibroblasts embedded in three-dimensional type I collagen gels under programmed tensile strain.
a tension‐unloading trajectory led to reduced FAK and NF‐κB signals
Challenges one part of the mechanism
In the 2026 bandage study, prestrained dressings accelerated rat wound closure; the study also reported reduced inflammatory gene expression and a macrophage shift toward a repair-associated phenotype. Faster repair can therefore coexist with reduced inflammatory markers. This challenges an unconditional speed-to-inflammation assumption, but microbial-component clearance, equal final barrier function and dissipation-dependent injury were not established.
Experimental system: Acute full-thickness dorsal skin wounds in Sprague-Dawley rats treated with 20% prestrained bandages and control dressings or sutures.
the MIB‐S group significantly accelerated the wound healing process
Related research
The 2026 diabetic wound study found greater focal adhesion kinase pathway enrichment in angiogenic fibroblasts during nondiabetic healing. This is a transcriptomic association supported by marker staining, not a causal manipulation of closure rate or energy dissipation. It provides context for mechanical signaling during repair without testing the proposed injury mechanism.
Experimental system: Splinted full-thickness dorsal wounds in female nondiabetic C57BL/6 mice, high-fat-diet diabetic mice and leptin-receptor-deficient diabetic mice.
N-DB AFs demonstrated strong upregulation of the FAK pathway at PODs 2 and 7
Search scope: 9 queries, 2 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42136529 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42442116 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42414447 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (epithelial mechanical dissipation injury) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (mechanical stress DAMP release) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (epithelial mechanics barrier repair) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (mechanical dissipation skin inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (viscoelastic relaxation tissue damage) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (skin mechanotransduction sterile inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In the repairing epidermis of people aged 40–60, washing before friction may fuse keratinocytes, speeding closure but increasing damage from later stress after mechanical relaxation. A persistent order effect without cell fusion would reject a necessary link in this hypothesis.
Conclusion and evidence (3 findings)
No direct test of this prediction was found in the supplied studies. The 2026 fly experiments demonstrate injury-induced epithelial fusion and support a contribution to repair; the 2026 macrophage study links environmental exposures to increased multinucleation under fusion-promoting conditions. None compares washing-friction sequences in human epidermis, verifies mechanical relaxation before repeat loading, or measures subsequent damage against cytoplasmic continuity. Neither the proposed structural memory nor its independence from ERK and microbial activity was tested. The verdict reflects indirect component evidence and absence of a direct test, rather than mixed direct results or an informative negative experiment.
Prediction being checked
In repairing epidermis from people aged 40-60, washing followed by friction causes more fusion of living keratinocytes than the reverse sequence at equal total exposure. The resulting shared cytoplasmic regions accelerate closure but cause larger areas of damage under identical repeat loading after mechanical relaxation. Preventing fusion should reduce this order-dependent vulnerability, whereas changing spatial extracellular signal-regulated kinase (ERK) activity or microbial activity after fusion should leave it intact.
Conditions and limits of the evidence
The evidence concerns adult fly abdominal epithelium after ultraviolet A irradiation, pupal fly epidermis after laser injury, and exposed mouse macrophages. Human experiments used macrophage-like cells derived from the THP-1 leukemia cell line, not age-defined epidermal keratinocytes. Transfer to repairing human skin, repeat mechanical injury, and long-term skin resilience remains unestablished.
The experiment still needed
Compare both exposure orders in repairing human epidermis from donors aged 40-60 with matched washing and friction doses. Track living cells to establish fusion and persistent cytoplasmic continuity, distinguish fusion from failed cell division, and verify mechanical relaxation before an identical repeat load. Measure closure and repeat-damage area, and test whether selectively preventing fusion removes the order effect while preserving viability and controlling other repair functions. Separately alter spatial ERK activity or microbial activity after fusion while confirming that the fused regions remain intact. Sensitive detection of an order effect without fusion would contradict fusion's proposed necessity.
Supports one part of the mechanism
The 2026 ultraviolet-injury study demonstrated cytoplasmic mixing in adult fly epithelium, supporting genuine fusion after injury. Inhibiting Rac or Cdc42 also impaired repair, but effects on survival and other repair functions prevent a fusion-specific causal interpretation. Repeat mechanical vulnerability was not examined.
Experimental system: Adult Drosophila melanogaster abdominal epithelium following ultraviolet A irradiation, with mosaic cytoplasmic labeling and genetic perturbations.
Thus, cytoplasmic sharing of fluorescent proteins following UV-A irradiation appears to be primarily due to cell-to-cell fusion.
Supports one part of the mechanism
The 2026 pupal wound study directly tracked fusion and movement of multinucleated cells sharing cytoplasm. Atg1 knockdown reduced fusion and slowed closure, although impaired autophagy could independently affect migration. This supports the repair component; neither repeated loading nor fusion-dependent spread of damage was tested.
Experimental system: Laser-wounded Drosophila melanogaster pupal notum epithelium, examined by live imaging and internally controlled Atg1 knockdown.
In live imaging, we observed that syncytia frequently moved faster than unfused cells toward the wound, overtaking unfused cells as the wound closed.
Supports one part of the mechanism
The 2026 macrophage study found increased multinucleated giant-cell formation after surfactant or particle exposure in cytokine-supported cultures. This provides a distant analogy for exposure-associated fusion. It does not establish keratinocyte fusion, an exposure-order effect, or that fusion causes subsequent mechanical damage.
Experimental system: Mouse bone-marrow-derived macrophages exposed to surfactants or particles, with macrophage colony-stimulating factor and interleukin-4 supporting giant-cell formation.
These data suggest that membrane damage enhances macrophage fusion, a property of macrophages to respond to foreign materials.
Search scope: 9 queries, 3 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42189976 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42770840 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:40867529 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (keratinocyte cell fusion) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (keratinocyte syncytia formation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (keratinocyte wound healing) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (syncytia repeated mechanical injury) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (epithelial fusion multinucleation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (keratinocyte cytokinesis failure) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
Early stimulus withdrawal and altered moisture may only appear to accelerate skin recovery by reducing the applied shear load. In paired samples from one donor, a persistent intrinsic-strength advantage at comparable hydration, closure and load would reject this explanation.
Conclusion and evidence (2 findings)
No supplied experiment directly tests this prediction. The 2025 fingertip study links hydration to friction in healthy intact skin, with substantial dependence on surface structure. The 2025 corneocyte study shows temperature-dependent friction at fixed normal load, but uses isolated dead cells at constant ambient humidity. These findings make unequal mechanical exposure plausible; neither establishes that it entirely explains an apparent healing benefit. Neither study withdraws a migration stimulus, follows wound recovery, or compares equal-pass testing with hydration-equilibrated, shear-matched testing. The verdict reflects absent direct testing and only component evidence, not mixed direct results or an informative negative experiment.
Prediction being checked
Stopping epithelial migration stimulation before wound closure while changing moisture conditions only appears to accelerate recovery of friction tolerance because it reduces the shear delivered during testing. The advantage should occur with equal textile passes but disappear after hydration equilibration and feedback-controlled matching of applied shear, with comparable wound closure. Recovery of shear-failure threshold, barrier function and morphological maturity should remain unchanged, while the apparent optimal withdrawal time should depend on the test surface and conditions.
Conditions and limits of the evidence
The hypothesis concerns healing epithelium, but does not specify species, anatomical site, migration stimulus or moisture regimen. The supplied evidence concerns healthy human finger pads and isolated human fingertip corneocytes. It does not establish recovery of tissue strength, barrier restoration, epithelial maturation or an optimal withdrawal time.
The experiment still needed
In a specified healing epithelial system, randomize paired wounds to early versus continued migration stimulation and independently vary moisture, including several withdrawal times before closure. Verify stimulus activity and withdrawal, hydration and wound closure. Compare equal textile passes at fixed normal force and speed with tests after hydration equilibration that use feedback to match the applied shear history. Follow shear-failure thresholds, barrier function and blinded morphological maturation, using independent samples where testing causes damage. Repeat across textile materials, with biological replication, assay sensitivity controls and prespecified equivalence margins. Disappearance of the equal-pass advantage together with equivalent recovery trajectories would support the artifact explanation; a persistent strength advantage under matched hydration, closure and shear would refute it.
Supports one part of the mechanism
The 2025 fingertip study found a hydration–friction correlation on rough plastic (R = 0.75, p < 0.001), while the association on compliant micropillar surfaces was weak (R = 0.20, p = 0.1). This supports surface-dependent hydration effects as a possible testing confound. Hydration was measured rather than experimentally manipulated; the weak correlation does not establish absence of an effect. No healing or stimulus withdrawal was tested.
Experimental system: Healthy intact finger-pad skin in 60 human volunteers aged 20–70, explored against rough plastic and microstructured rubber; normal force was guided toward 0.8–1.2 N.
The average coefficient of friction for the randomly rough plastic samples is positively correlated with SC hydration
Supports one part of the mechanism
The 2025 heated-probe study measured changing friction while holding normal load at 10 nN and ambient relative humidity at 40%. It supports the limited premise that fixed normal load does not fix frictional exposure. Hydration-mediated lubrication was an interpretation, not an independently controlled mechanism. Surface heterogeneity produced substantial uncertainty, and calculated interfacial shear stress was not a healing tissue's failure threshold.
Experimental system: Three isolated fingertip corneocytes from one healthy 36-year-old man, tested by lateral force microscopy with a heated atomic force microscope probe; the main calibrated temperature range was approximately 25–40 °C.
Dynamic friction increases with the temperature of the heated AFM tip.
Search scope: 9 queries, 2 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42633909 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42400154 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:40121378 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (skin hydration friction coefficient) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (skin hydration COF) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (skin hydration barrier function) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (friction wound mechanical recovery) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (moisture tribology contact mechanics) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (epithelial adhesion mechanical strength) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In previously sensitized people, tissue transglutaminase TG2 may link microbial peptides to tissue proteins during repair, sustaining inflammation after microbial clearance. No detectable conjugates with sufficiently sensitive analysis, or equal activity of linked and free forms, would refute this proposal.
Conclusion and evidence (4 findings)
No direct test of this prediction was found in the supplied studies. The strongest biochemical evidence is the 2020 identification of covalent complexes between human TG2 and cereal gluten peptides in vitro. It establishes crosslinking capability, but neither microbial peptide incorporation into repairing skin nor persistent T-cell activation. TG2 deletion improved outcomes after mouse spinal cord injury, whereas mouse skin responded similarly to imiquimod with or without TG2. Microbial transglutaminase treatment of flour also failed to increase serum antibody binding. These findings provide component evidence and limits on generalization, not comparable supporting and contradictory tests of the conditional skin hypothesis.
Prediction being checked
In previously sensitized people, accelerated skin repair increases tissue transglutaminase 2 (TG2)-mediated covalent conjugates between microbial peptides and human proteins and prolongs antigen-specific responses of the person's own T cells, despite clearance of viable microbes and free microbial products. At matched permeability, mechanical load and free microbial product levels, preventing conjugation should abolish late inflammation; isolated conjugates should restore it and produce a stronger response than equivalent unlinked components.
Conditions and limits of the evidence
The hypothesis concerns repairing human skin with established prior sensitization, clearance of microbes and free products, and recurrent wetting or microinjury. Available experiments concern purified human TG2 with plant peptides, flour proteins tested against human sera, mouse spinal cord injury, and imiquimod-treated mouse skin. They do not establish microbial-human conjugate persistence, autologous T-cell responses, or the proposed order of substrate clearance and barrier repair in humans.
The experiment still needed
A direct comparison is needed in repairing human skin with verified prior microbial-antigen sensitization and immune cells from the same donor. Compare accelerated and ordinary repair while matching permeability, mechanical load and residual free microbial products. Establish microbial-human covalent bonds and their persistence with validated analytical sensitivity, alongside antigen-specific T-cell responses over time. Test whether selectively preventing conjugation removes late inflammation while preserving repair, and whether purified conjugates restore it more strongly than matched unlinked components after microbial clearance. Recurrent wetting and the proposed clearance-before-repair sequence also require comparison.
Supports one part of the mechanism
The 2020 gluten-crosslinking study identified covalent TG2-gluten products by mass spectrometry with inactive-enzyme controls. This supports the chemistry of foreign peptide attachment to a human protein. It did not examine microbial peptides, skin repair or functional T-cell responses.
Experimental system: Purified recombinant human TG2 incubated with enzymatic hydrolysates of wheat, rye and barley proteins in vitro.
We identified 29 isopeptides of TG2 with peptides from gluten hydrolysates from wheat, rye and barley in vitro using a reciprocal proteomics strategy.
Challenges one part of the mechanism
The 2019 flour study observed protein aggregation without increased immunoglobulin G binding; some pooled-serum comparisons showed reduced binding. This limits the assumption that crosslinking necessarily enhances immune recognition. The enzyme was microbial transglutaminase, the substrates were food proteins, and antibody binding does not test persistent T-cell inflammation.
Experimental system: Microbial-transglutaminase-treated flour extracts tested against sera from people with celiac disease, non-celiac gluten sensitivity and healthy controls.
dough protein immunoreactivity did not increase after mTG treatment.
Supports one part of the mechanism
The 2025 spinal cord injury study found improved tissue preservation after global TG2 deletion. This supports a role for TG2 in post-injury pathology in that model. Neither microbial-human conjugates nor antigen-specific T-cell persistence was measured, and global deletion does not isolate conjugation from TG2's other functions.
Experimental system: Adult mice with severe compression injury of the thoracic spinal cord, comparing global TG2 knockout with TG2-intact controls.
Quantitative evaluation of preserved tissue showed that TG2 KO mice had smaller lesion areas compared to TG2 intact controls
Challenges one part of the mechanism
The 2020 psoriasis-model study found similar skin histology after imiquimod treatment with or without TG2. This limits a general claim that TG2 is required for skin inflammation. It does not refute the conditional hypothesis: prior microbial sensitization, conjugates, accelerated repair and post-clearance T-cell persistence were not tested, and the null comparison was not an equivalence test.
Experimental system: Male C57BL/6 mice with TG2 or TG3 deletion and wild-type controls, receiving topical imiquimod on back skin for ten days.
TG2KO skin sections were substantially indistinguishable from the corresponding WT skin sections in both imiquimod-treated and control samples.
Search scope: 9 queries, 4 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42552594 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:41272463 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:32367038 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (tissue transglutaminase microbial peptide crosslinking) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (TG2 microbial peptide crosslinking) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (TG2 wound healing) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (antigen crosslinking skin inflammation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (protein transamidation neoantigens) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (TG2 deamidation antigenicity) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
After collagen VII restoration, irreversible unfolding of dermal collagen I and III may limit repeated shear tolerance. Test different force variances at matched mean force and duration; rapid recovery only after suppressing PIEZO1, with unchanged molecular damage, would contradict this proposed main limitation.
Conclusion and evidence (3 findings)
No direct test of this conditional prediction was found. The 2026 mouse ligament study supports localized collagen unfolding associated with increased compliance after fatigue loading. The 2024 rat Achilles study challenges generalization: detectable denaturation appeared during recovery alongside cellular remodeling rather than immediately after running; protease causality remained untested. Neither study restored collagen VII, tested aged skin, varied force variance at matched mean force and duration, or inhibited PIEZO1. These are indirect findings in different systems, not mixed direct evidence. Failure of verified functional anchoring-fibril restoration to improve shear tolerance in a sufficiently sensitive experiment would challenge their proposed role as the principal limitation, but would not establish collagen unfolding as the replacement explanation.
Prediction being checked
After mature collagen VII anchoring fibrils are restored to the young range in aged skin following wound closure, rare, persistent unfolding of dermal collagen I and III remains the principal limit on repeated-shear tolerance. Damage depends on local loading history, precedes cellular contraction and visible rupture, persists during inhibition of the mechanosensitive channel PIEZO1, and occurs in isolated dermal matrix. Preventing unfolding should improve shear tolerance.
Conditions and limits of the evidence
The supplied experiments concern young mouse ligaments, young rat Achilles tendons, bovine dura mater, and puncture-induced rat disc degeneration. They do not establish irreversible collagen I/III unfolding as the dominant cause of shear failure in healed aged skin after collagen VII restoration. Local indentation stiffness, collagen-denaturation signals, and tissue-level fatigue resistance are distinct measurements.
The experiment still needed
Verify youthful anchoring-fibril abundance, maturity, integration and function in healed aged skin, with sham-restored and young controls. Apply repeated shear with matched mean force and duration but different force variance, recording work, local strain and peak force. Prospectively predict first molecular damage from complete loading histories and validate on new sequences. Measure collagen I/III unfolding and its persistence between cycles alongside contraction, rupture and shear tolerance, with sensitivity controls and assays distinguishing mechanical unfolding from proteolysis. Repeat with verified PIEZO1 inhibition and isolated dermal matrix, controlling isolation damage. Test whether selectively reducing unfolding rescues tolerance. Rapid rescue by PIEZO1 inhibition despite unchanged molecular damage would contradict unfolding as the principal limitation.
Supports one part of the mechanism
The 2026 ligament experiment applied 5,000 submaximal loading cycles and sampled tissue after one hour. Collagen damage was localized, and regions with greater unfolding had greater fibril-level compliance. This supports a damage-mechanics association, but does not establish irreversible accumulation, causal dominance, or the prediction in repaired skin.
Experimental system: Anterior cruciate ligaments of five 10-week-old female C57BL/6J mice; in vivo loading with contralateral controls and subsequent microscopy of fixed tissue sections.
Specifically, domains of unraveled/intact collagen ratios greater than 0.3 had greater mechanical compliance
Challenges one part of the mechanism
The 2024 running experiment found no detectable immediate increase using two denaturation assays, with mechanical-overload positive controls. Denaturation increased after 12 hours, while cellular activation was already evident immediately after running. This challenges treating every post-load denaturation signal as primary mechanical unfolding. Protease involvement was correlational, and these results cannot exclude rare damage or refute the skin-specific prediction.
Experimental system: Achilles tendons of male Sprague-Dawley rats aged 8–10 weeks after one or three hours of uphill treadmill running, with recovery sampling and cage controls.
the denatured collagen content in the Achilles tendons increased notably at 12 hours p.r.
Related research
The 2026 dura experiment showed increased local indentation stiffness after riboflavin and ultraviolet-A treatment. It did not measure collagen unfolding or cyclic shear endurance. Stiffening therefore does not demonstrate the proposed rescue through prevention of molecular damage.
Experimental system: Forty ex vivo bovine dura specimens from animals aged 4–6 months, assessed by paired atomic-force-microscopy nanoindentation with ultraviolet-only controls.
Paired before-and-after analysis confirmed that stiffening occurred within individual tissue samples rather than reflecting between-sample variability
Search scope: 9 queries, 4 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:39152721 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:40441088 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39356750 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (type I collagen force-induced unfolding) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (COL1 COL3 mechanical unfolding) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (type III collagen tensile strength) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (collagen unfolding skin fatigue) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (triple helix force-induced denaturation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (collagen fibril sliding fatigue) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In reconstructed skin, repeated treatment may select initially rare resistant cell lineages whose production of self-renewing basal cells exceeds losses after withdrawal. Baseline samples should predict survival and faster repopulation; failure to predict it alongside functional donor DNA would favor a rival.
Conclusion and evidence (4 findings)
No supplied primary experiment directly tests this prediction in skin. The 2026 esophageal study provides treatment-associated evidence of mutant selection; its causal culture experiment concerns irradiation of mouse esophageal cells. Pancreatic cancer experiments demonstrate soluble growth signaling, lymphoma experiments establish a metabolic resistance mechanism, and glioma lineage tracking demonstrates treatment-related changes within clones. These are component evidence and alternatives in other systems, not mixed direct evidence for the skin hypothesis. None combines pretreatment lineage prediction, repeated courses, equal-cell transfer, unchanged lineage growth and a measured cell-fate threshold. Neither confirmation nor an informative direct refutation is available.
Prediction being checked
Repeated antimetabolite courses accelerate absolute skin repopulation after withdrawal by selecting initially rare resistant basal-cell lineages whose production of self-renewing cells exceeds losses through death and terminal differentiation. Pretreatment lineage properties predict survival; the population advantage persists after equal-cell transfer into untreated skin models, while each lineage retains its pretreatment growth rate. Persistence rises sharply near the balance between cell production and loss, and extinction slows when approaching that balance from below.
Conditions and limits of the evidence
The target is skin basal-cell lineages during repeated antimetabolite removal of atypical cells and subsequent withdrawal; species, drug and regimen are unspecified. Supplied studies concern human normal esophagus, mouse esophageal cultures, human leukemia and pancreatic cancer cells, human and mouse lymphoma, and human glioma cultures. They do not establish accelerated skin recolonization, its proposed persistence threshold, stabilization of a treatment-related skin outcome, or human lifespan benefit.
The experiment still needed
In a defined skin model, prospectively track lineages with matched pretreatment samples through repeated antimetabolite courses and withdrawal. Measure absolute basal-cell numbers and occupied area, self-renewing cell production, death and terminal differentiation. Compare equal viable-cell transfers with untreated lineage controls in fresh matched models, and test equivalence of each lineage's pre- and post-treatment growth rates. Vary the measured production-to-loss balance to assess persistence probability and extinction time near the proposed threshold. Cell-free-medium controls and assays for functional donor DNA should distinguish selection from transferred signals or genetic material. Replication, verified exposure and adequate sensitivity are needed.
Supports one part of the mechanism
The 2026 esophageal study found treatment-specific selection in human tissue after combination chemotherapy containing fluorouracil. This supports selection as a plausible component, but the comparison was observational and lacked matched pretreatment lineage growth measurements. Its separate mouse irradiation experiment does not establish antimetabolite-driven skin repopulation.
Experimental system: Normal esophageal epithelium from patients undergoing surgery after different neoadjuvant treatments or no treatment.
Mutant NFE2L2 , RAC1 and MTOR showed 1D clustering in multiple groups but were only under positive selection in the FLOT group.
Challenges one part of the mechanism
The 2025 pancreatic cancer study showed that gemcitabine-treated dying cells stimulated reporter-cell growth across a cell-separating membrane; inhibiting autotaxin reduced this effect. It demonstrates a soluble signaling alternative involving lysophosphatidic acid. It challenges attributing regrowth to selection alone, but does not refute that mechanism in skin.
Experimental system: Human PATU8988T and AsPC-1 pancreatic cancer cultures, direct and indirect coculture after gemcitabine exposure.
Notably, HA130 effectively reversed the pro-proliferative effects induced by dying cells following chemotherapy.
Supports one part of the mechanism
The 2026 lymphoma study causally linked the dipeptide transporter SLC15A3 to mercaptopurine resistance through knockdown. This establishes a functional resistance component. Comparisons of parental and resistant populations do not determine whether rare pre-existing lineages were selected or whether individual lineages changed, and do not measure the proposed basal-cell threshold.
Experimental system: Human Ramos lymphoma cells made resistant by prolonged mercaptopurine exposure; related mouse lymphoma cultures and allografts.
SLC15A3 downregulation reverted the resistance of 6MP R cells to 6MP treatment
Challenges one part of the mechanism
The 2026 glioma study followed single-cell-derived colonies before and after temozolomide and found changes in within-clone signaling heterogeneity. This cautions against assuming fixed lineage properties. However, signaling variability is not the proposed basal-cell production-to-loss balance, and the alkylating drug, tumor system and single exposure differ from repeated skin antimetabolite treatment.
Experimental system: Human A172 glioma colonies tracked after temozolomide withdrawal, with additional population measurements in U-251 MG cells.
TMZ treatment changed the ERK phenotypic space occupied by the cells of colonies after treatment
Search scope: 9 queries, 5 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:42622615 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:42365380 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:39903418 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (fluorouracil resistant clone selection) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (5-FU resistant clone selection) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (fluorouracil thymidylate synthase inhibition) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (clonal selection epidermal repopulation) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (birth-death process survival threshold) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (antimetabolite induced drug resistance) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
No decisive evidence yetVersion 1.2Checked Oct 20, 2026
In the dermis, repeated loads may leave calcium phosphate seeds that grow and restrict elastic fibres, making recovery depend on load order. No detectable mineral phase with confirmed assay sensitivity, together with a defect carried only by transferred cells, would refute the hypothesis.
Conclusion and evidence (3 findings)
No direct test of this prediction was found in the supplied studies. The 2024 elastin experiments support increased calcium deposition after proteolytic damage, while the 2023 skin-biopsy study documents submicrometric calcium-containing deposits. Neither establishes particle persistence between loading cycles or mineral-driven loss of recovery. The 2026 stretched-scar experiments demonstrate cellular contributions to pathology despite undetected calcification, but do not establish the required supersaturation, mineral-detection sensitivity or mechanical endpoint. Thus the evidence is indirect, with unresolved alternatives, rather than mixed direct support and refutation.
Prediction being checked
In dermis with normal resting properties, repeated mechanical damage coinciding with transient local calcium-phosphate supersaturation creates persistent mineral particles that store loading history. With identical cumulative loading, an adverse sequence should increase persistent particles before impairing shape recovery after a common final challenge. Mechanically inert seed doses should accelerate the defect, crystal-growth inhibition should prevent it and reduce sequence dependence, and the defect should remain in decellularized matrix rather than transfer with cleaned cells. Circadian timing matters only where mineralization conditions measurably vary with phase.
Conditions and limits of the evidence
Evidence concerns cultured human dermal fibroblasts from pseudoxanthoma elasticum, isolated elastin in calcifying medium, skin biopsies from patients with end-stage renal disease, human keloids and stretched rat tail scars. It does not establish mineral-dependent loading memory in otherwise normal dermis, circadian modulation of that process, or consequences for human lifespan.
The experiment still needed
Randomize matched dermal preparations with normal resting mechanics to different orders of the same loading episodes, keeping cumulative exposure and recovery duration equal. Verify local supersaturation and any phase-dependent pH or ion-activity changes. Quantify particle identity, number and persistence with calibrated detection limits before measuring shape recovery after an identical final challenge. Include seeds that alone do not alter mechanics, selective crystal-growth inhibition, and controls for viability, cell genetic composition and direct mechanical drug effects. Compare decellularized loaded matrices with cleaned cells transferred to fresh matrices, controlling for mineral carryover and decellularization damage. Mineral absence at adequate sensitivity together with cell-only transfer of the defect would directly challenge the mechanism.
Supports one part of the mechanism
The 2024 experiment incubated isolated elastin with conditioned media from affected or unaffected skin fibroblasts, then with calcifying medium for 72 hours. Greater calcium deposition after treatment with affected-skin secretions supports damage-enhanced mineralization. Cultured fibroblasts also differed in collagen-gel contraction, leaving cellular contributions plausible. Neither assay tested loading order, mineral persistence or shape recovery.
Experimental system: Dermal fibroblasts from paired affected and unaffected skin sites of three women with pseudoxanthoma elasticum; isolated elastin and collagen-gel assays.
calcium levels were significantly higher after degradation with CAS- compared to CUS secretome
Supports one part of the mechanism
The 2023 biopsy study directly localized calcium- and phosphorus-containing particles on altered elastic fibers. However, some specimens had straight fibers without detected dermal calcification, and others had calcification without straightening. This observational discordance leaves causal direction unresolved; acknowledged detection limitations prevent interpreting mineral-negative samples as a refutation.
Experimental system: Retrospective skin-biopsy comparison of 14 patients with calcific uremic arteriolopathy and 12 renal-disease controls.
fragmented straight elastic fibers were covered with smaller spherical entities of 300 to 500 nm, composed of Phosphorus and Calcium
Challenges one part of the mechanism
The 2026 study produced pathological scarring by sustained stretching after wound closure; adrenergic interventions reduced scar pathology despite undetected calcification. This challenges a broad requirement for detectable mineral in mechanically induced skin pathology. It does not refute the conditional prediction: loading sequence, transient supersaturation, submicroscopic mineral sensitivity, shape recovery and matrix-versus-cell transfer were not tested.
Experimental system: Male Sprague-Dawley rats with re-epithelialized tail wounds subjected to sustained stretching for 14 or 28 days.
calcification was not observed in this rat model of keloid
Search scope: 9 queries, 3 retrieved texts
This is a bounded search of accessible literature as of the stated check date. Missing a direct test here does not establish that no such paper exists. Abstracts and reviews can guide the search; a decisive verdict requires a retrieved full primary article. Experimental confirmation in cells or animals does not establish effectiveness in humans.
- (EXT_ID:37726292 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:38755434 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (EXT_ID:36015534 AND SRC:MED) AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (calcium phosphate nucleation dermis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (CaP nucleation dermis) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (calcium phosphate bone mineralization) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (dermal calcification loading sequence) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (dystrophic calcification elastic fibers) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)
- (elastin fragmentation dermal fatigue) AND OPEN_ACCESS:Y AND FIRST_PDATE:[* TO 2026-10-20] (Oct 20, 2026)