Open questions
The questions we work from
The open scientific questions come first. The decisions about how we choose between them are underneath.
Open scientific questions
Questions with no settled answer
- 01Остаётся неизвестным относительный вклад восстановления теломер и митохондриальной обратной транскриптазы теломеразы (TERT) в устойчивое восстановление функций при физиологическом старении. В предоставленных утверждениях митохондриальная TERT связывает митохондриальную ДНК и защищает её и функцию митохондрий от повреждения. Результаты, полученные на животных с дефицитом теломеразы, не позволяют установить, какой механизм преобладает в тканях при обычном старении. Проведение расширенного поиска не документировано.
1 rival hypothesis
2 tests - 02Может ли утрата регуляторной пластичности самостоятельно поддерживать дисфункцию, первоначально вызванную повреждениями и воспалением, или наблюдаемое восстановление требует исправления повреждений либо отбора клеток? В корпусе работ предложены причинные иерархии и обратные связи, однако их относительный вклад остаётся неясным. Проведение расширенного поиска не задокументировано.
8 rival hypotheses
8 tests - 03Вызывает ли сохраняющаяся активность механистической мишени рапамицина (mTOR) после защитной остановки клеточного цикла патологическую секрецию и нарушение регенерации, или определяющую роль играют неустранённые повреждения и истощение способности к восстановлению? Собранные источники описывают отдельные звенья, но не полную причинную последовательность. Проведение расширенного поиска не документировано.
6 rival hypotheses
6 tests - 04При каких условиях пространственного распределения и длительности действия активные формы кислорода поддерживают митохондриальную дисфункцию, а при каких отражают повреждение аппарата клеточного дыхания или запускают защитную адаптацию? Представленный корпус работ не позволяет разграничить эти вклады в одной модели старения при сопоставимых условиях. Новизна вопроса в мировой научной литературе не проверена.
3 rival hypotheses
3 tests - 05Остаётся установить, какие возрастные изменения метилирования причинно меняют транскрипцию и функцию тканей, какие служат признаками других повреждений, а какие поддерживают адаптацию. Восстановление функции после перепрограммирования само по себе не устанавливает посредническую роль метилирования и не подтверждает пригодность эпигенетических часов в качестве суррогатных конечных точек. Среди архивных фрагментов есть обрезанные записи и сведения, представленные только заголовками. Для оценки полноты данных и новизны в масштабе всей области необходим расширенный поиск.
4 rival hypotheses
4 tests - 06В каких случаях хроническое воспаление требует продолжающегося повреждения, а в каких нарушение завершения воспалительной реакции или взаимная передача сигналов между клетками поддерживает его после исчезновения исходного стимула? В представленных материалах полный переход к самоподдерживающемуся состоянию не продемонстрирован; проведение расширенного поиска не документировано.
6 rival hypotheses
6 tests - 07Могут ли стойкие изменения матрикса повторно вызывать дисфункцию после восстановления внутриклеточных процессов через механическую передачу сигналов, растворимые факторы или оба пути? Собранные материалы дают основания предполагать существование памяти на уровне ткани, однако общий порог восстановления, применимый и к коже, и к тканям глаза, пока не установлен. Проведение расширенного поиска не задокументировано.
1 rival hypothesis
1 test - 08Неясно, перераспределяет ли эпигенетический сдвиг в пользу специализированных функций ограниченные ресурсы транскрипции и трансляции в ущерб поддержанию клетки и тем самым вызывает нарушение протеостаза, или этот сдвиг отражает компенсацию, изменение клеточного состава либо нарушение деградации. В представленном корпусе предложена модель, отводящая этому сдвигу роль первичного причинного звена, однако прямых доказательств всей последовательности нет. Проведение расширенного поиска не задокументировано.
9 rival hypotheses
9 tests - 09Неясно, какая доля стойкого клеточного старения в тканях человека при естественном старении обусловлена критически короткими теломерами, а какая связана с окислительными повреждениями при сохранённой длине теломер. Также неизвестно, какой из этих дефектов определяет ответ на теломеразу. Причинная роль каждого пути частично подтверждена, однако их сравнительный вклад остаётся неустановленным в представленном корпусе источников. Сведений о проведении расширенного поиска нет.
5 rival hypotheses
5 tests - 10В каких условиях подавление mTORC1 улучшает показатели старения за счёт ослабления сигналов роста, а в каких за счёт усиления поддержания клеточных функций посредством аутофагии? Объясняет ли вклад этих процессов различия между ограничением калорийности питания и действием рапамицина? Проведение расширенного поиска по всей научной области не задокументировано.
4 rival hypotheses
5 tests - 11Why might treatment for inflammation fail to slow human aging?
The proposed benefit starts with blocking interleukin-11 signaling, followed by less inflammation, less accumulating damage, and better preservation of function.
5 rival hypotheses · 3 possible answers
Untested - 12Can damage buildup stay slower in aging bodies?
The proposed sequence connects restored tissue protection, removal of damaged cells, rebuilt capacity, and a sustained reduction in new damage.
5 rival hypotheses · 4 possible answers
Untested - 13Can fasting-like treatments extend life?
The proposed chain begins with temporary suppression of a growth-regulating target, followed by an interval in which muscle protein building can recover.
5 rival hypotheses · 3 possible answers
Untested - 14How can a treatment protect the heart?
Muscle-produced glutamine can supply fuel to cells lining internal surfaces and to immune cells, providing a reported starting point for the proposed connection between tissues [S1].
5 rival hypotheses · 3 possible answers
Untested - 15Can tissue repair extend life?
The proposed benefit begins with restoring a damaged tissue barrier, allowing the tissue to perform its protective role again.
5 rival hypotheses · 4 possible answers
Untested - 16Do human–machine retellings need a new explanation for meaning changes?
A retelling changes the version available to the next storyteller, so changes introduced at one step can affect what happens later.
5 rival hypotheses · 3 possible answers
Untested - 17How many distinct explanations are needed for how culture spreads?
Grouping explanations determines what is counted as a separate account of cultural change.
5 rival hypotheses · 4 possible answers
Untested - 18Do menopause symptom groups predict which treatments work best?
A symptom classification can influence who qualifies for a treatment and which treatment is selected.
5 rival hypotheses · 3 possible answers
Untested - 19Which menopause treatments could bring lasting improvements in body function?
Reducing hormone fluctuations and increasing average hormone exposure change different features of the hormonal environment.
5 rival hypotheses · 4 possible answers
Untested - 20How could this treatment extend life in mice?
The proposed explanation links suppression of the growth-control protein to removal of damaged cellular structures, then to lasting benefits across several body systems, and finally to longer life.
5 rival hypotheses · 3 possible answers
Untested - 21Can a treatment keep benefiting several body systems?
The proposed chain runs from reduced receptor signaling to improved removal of worn-out immune cells, then to less inflammation and better function across several body systems.
5 rival hypotheses · 3 possible answers
Untested - 22Does ending inflammation encourage or prevent scarring?
The proposed chain starts with a signal changing the activity of tissue-cleaning immune cells.
5 rival hypotheses · 3 possible answers
Untested - 23Can exercise hasten kidney or gut decline in older adults?
Moving more easily and maintaining organ function are different outcomes.
4 rival hypotheses · 3 possible answers
Untested - 24Why might muscle repair leave lasting weakness in older people?
Removing damaged material and restoring working material are different steps in the proposed chain.
4 rival hypotheses · 4 possible answers
Untested - 25Can treatment restore lasting function in aging human cells?
The proposed benefit requires several steps: treatment changes cell regulation, cells retain or recover their specialized jobs, and those cells continue maintaining and replacing tissue after treatment stops.
4 rival hypotheses · 4 possible answers
Untested - 26Can stimulating tissue repair speed up aging?
The proposed chain starts with repeated repair stimulation changing which cells survive and multiply.
4 rival hypotheses · 4 possible answers
Untested - 27Can treatment of aging tissue linings let dangerous growth spread?
The proposed causal chain begins with suppressing an expanding cell family, which changes which cells remain in the tissue.
4 rival hypotheses · 4 possible answers
Untested - 28Why might tissue renewal treatments shorten life?
The proposed chain begins with an imitation substance changing when tissue processes occur.
4 rival hypotheses · 3 possible answers
Untested - 29Can treatment preserve cell recycling without favoring some cells over others?
The broader context is whether imitating physiological processes could help extend life.
4 rival hypotheses · 3 possible answers
Untested - 30Which parts of the gut must treatments affect to extend life?
Changing a process in a cell does not by itself establish that the change makes an organism live longer.
4 rival hypotheses · 4 possible answers
Untested - 31Does earlier exposure change what people keep passing on?
Earlier encounters could change what people remember, and what they remember could in turn affect what they later pass on.
4 rival hypotheses · 3 possible answers
Untested - 32Can meaning changes in human–machine retellings be predicted?
A rewriting step changes the material that the next participant receives, so small changes can accumulate as a story or other cultural item passes through a sequence.
4 rival hypotheses · 3 possible answers
Untested - 33How can cultural information survive disruptions?
In the mechanism being considered, exposure leads to further circulation, which can generate additional exposure and keep related cultural items active.
4 rival hypotheses · 3 possible answers
Untested - 34Can checking preserve mistaken meanings through repeated retelling?
A message can retain recognizable words while the relationships or implications those words convey change.
4 rival hypotheses · 3 possible answers
Untested - 35Can a muscle-strengthening treatment shorten life?
Electrical stimulation causes muscle contractions, and those contractions place loads on the tendons that connect muscles to bones.
4 rival hypotheses · 3 possible answers
Untested - 36Can a tissue-supporting treatment extend life?
The proposed benefit depends on a sequence: changing the material around cells would protect tissue, that protection would preserve function through injury, and the resulting effects would increase remaining lifespan.
4 rival hypotheses · 3 possible answers
Untested - 37How many different bodily functions do treatments reproduce to extend life?
A treatment's ingredients, the biological processes it changes, and its effect on survival are different things.
4 rival hypotheses · 3 possible answers
Untested - 38Why might sleep and automatic body control remain disrupted after awakening?
The proposed causal chain starts with a hot flash, proceeds to disrupted sleep and changes in automatic body control, and ends with those disturbances reinforcing one another after the original flash ends.
4 rival hypotheses · 3 possible answers
Untested - 39Which order of correction and retelling best preserves meaning?
When people pass material on, later versions can carry different meanings from earlier versions.
4 rival hypotheses · 4 possible answers
Untested - 40Which new explanations of cultural survival hold up?
An explanation links a change in conditions to a change in cultural behavior through a stated causal process.
4 rival hypotheses · 4 possible answers
Untested - 41What changes whether people privately follow cultural practices?
Public repetition determines what cultural material becomes visible to others, but private adoption concerns what someone accepts or continues to practice.
4 rival hypotheses · 4 possible answers
Untested - 42Why might menopause hormone treatment prolong blood clot risk?
The proposed chain begins with the delivery route changing the liver's initial exposure to the hormone, which could change its contribution to clotting.
4 rival hypotheses · 3 possible answers
Untested - 43Why might someone feel cold and wake again after a hot flash?
The proposed chain begins with sweating and increased skin blood flow during a hot flash, followed by a fall in internal body temperature; S1 reports that shivering occurs if temperature crosses a lower threshold.
4 rival hypotheses · 3 possible answers
Untested - 44Why might a bone treatment hinder fracture healing?
Measurements of bone formation and breakdown describe aspects of bone activity; they do not directly measure successful healing or restored mobility.
4 rival hypotheses · 3 possible answers
Untested - 45Can repairing damage from menopause greatly extend life?
The proposed chain runs from menopause-related damage to disease, from disease to death, and from preventing deaths to additional years of life.
4 rival hypotheses · 3 possible answers
Untested - 46Why might treatment switch from growing dangerous breast cells to killing them?
If estrogen favors the survival or multiplication of dangerous breast cell groups, those groups could become more prominent during exposure.
4 rival hypotheses · 3 possible answers
Untested - 47Can ovaries help older female mice live longer?
An ovarian graft introduces living tissue, and the question distinguishes a proposed longevity signal from effects of the operation, hormone exposure, graft health and differences between recipient mice.
4 rival hypotheses · 3 possible answers
Untested - 48Which treatment order could restore lasting automatic body control during menopause?
The proposed chain runs from treatment order, through improvement in sleep or hot flashes, to recovery of automatic body regulation and continued benefit after treatment ends.
4 rival hypotheses · 4 possible answers
Untested - 49Why can damage between aging tissues sustain itself?
Under the proposed mechanism, damage in one tissue affects another, and a returning effect reinforces damage in the first tissue.
4 rival hypotheses · 3 possible answers
Untested - 50Can protection against infection be preserved with less lasting tissue damage?
In the mechanism proposed by the question, an earlier inflammatory episode changes blood-forming stem cells, which can then change the supply or behavior of cells involved in later defenses.
4 rival hypotheses · 3 possible answers
Untested - 51Why might tissue damage keep returning after treatment?
The proposed chain begins with senescent cells releasing substances that contribute to tissue damage.
4 rival hypotheses · 3 possible answers
Untested - 52How many separate routes to longer life do these treatments offer?
An intervention may affect a target, which changes a mediator, which then changes how a body system functions.
4 rival hypotheses · 3 possible answers
Untested - 53Which tissue treatments could improve several functions and extend life?
The proposed chain starts with a targeted change, passes through a mediator, and reaches the functions of several body systems before affecting lifespan.
4 rival hypotheses · 3 possible answers
Untested - 54Why might a kidney treatment reduce the kidneys' spare capacity?
Blocking sugar and sodium reabsorption changes the work performed within the kidney, and a supplied model predicts that oxygen use falls in one region while rising in another [S1, S3].
4 rival hypotheses · 3 possible answers
Untested - 55Can aging skin regain its youthful functions together?
The proposed causal chain starts with a change to the supporting material or to cell state, continues through changes in how cells and skin layers function together, and ends with improvement across all five specified areas.
4 rival hypotheses · 4 possible answers
Untested - 56Why might sweating stay low in recovered skin?
The question distinguishes recovery of an average skin measurement from recovery of sweat production.
4 rival hypotheses · 4 possible answers
Untested - 57Why might the effects of stress last longer with age?
A shared trigger can affect several organs, and different recovery speeds can make their changes appear in sequence.
3 rival hypotheses · 3 possible answers
Untested - 58Can rehabilitation speed up decline?
The proposed explanation starts with inactivity reducing physical capacity, which makes ordinary tasks consume a larger share of the capacity remaining.
3 rival hypotheses · 3 possible answers
Untested - 59Which repairs can slow damage buildup across the body's tissues?
The question distinguishes an immediate change in a local problem from a sustained change in how quickly damage accumulates throughout the body.
3 rival hypotheses · 3 possible answers
Untested - 60Must muscles recover for a treatment to extend life?
The proposed sequence is that intermittent treatment produces useful effects, muscle protein is replenished during the breaks, and the repeated cycles produce longer survival.
3 rival hypotheses · 3 possible answers
Untested - 61Which explanations of cultural change deserve testing first?
People and computer systems can affect which cultural material is encountered, how it is changed, whether it is taken up and whether its use continues.
3 rival hypotheses · 3 possible answers
Untested - 62Can treatment durably stop aging processes from worsening each other?
If damage in one organ worsens another organ, and that organ sends damaging effects back, an initial problem can become self-reinforcing; the lung–kidney review describes such a loop [S2].
3 rival hypotheses · 3 possible answers
Untested - 63What makes inflammation return?
Correcting an ongoing source of inflammation and removing a lasting change caused by that source are different steps.
3 rival hypotheses · 4 possible answers
Untested - 64Can the order of stresses affect skin's later recovery?
If earlier exposure order changes later function despite normal measurements, those measurements alone would not establish that a patch of skin has recovered its capacity to withstand further demands.
3 rival hypotheses · 4 possible answers
Untested - 65Can itch relief preserve the skin's warnings before injury?
The question treats an unpleasant sensation as a possible warning that allows exposure to heat or pressure to stop before tissue is injured.
3 rival hypotheses · 4 possible answers
Untested - 66Why might healing skin stay inflamed?
If a damaged barrier allows microbes to enter skin, restoring it could reduce further entry and thereby reduce one source of inflammation; S4 describes the possible entry step.
3 rival hypotheses · 3 possible answers
Untested - 67Can a skin treatment slow the skin's own repair?
Fats in the skin’s outer layer help limit water escape, so their arrangement is relevant to its protective barrier, as described in S4.
3 rival hypotheses · 3 possible answers
Untested - 68Why might the skin's cooling become unstable?
Heat production and heat loss depend on coordinated automatic bodily responses, according to S9.
3 rival hypotheses · 3 possible answers
Untested - 69Can treatment end persistent skin damage and irritation?
Persistent itch can drive scratching, and scratching can physically damage skin, as S5 and S6 report.
3 rival hypotheses · 4 possible answers
Untested - 70Can skin cooling be restored to youthful levels?
The proposed explanation separates sweat production from the evaporation through which sweat removes heat.
3 rival hypotheses · 4 possible answers
Untested
How we choose
The decisions behind the work
Five editorial questions about what to build and what to publish. They are not scientific results.
- 01What do we do, depending on how difficult we believe ageing is?
Decide what kind of problem we are trying to solve
Proposed answer - 02Which hypotheses do we test first, and who decides?
Choose the uncertainty to resolve next
- 03Where exactly are the bottlenecks?
Put effort where it unlocks the next step
- 04How does a culture come to care about one specific life?
Make the value of a particular life part of the argument
- 05In which arena is the fight against death actually fought?
Choose where action can change the outcome