Skin lipids suppress repair signaling

Could a skin treatment that reduces water loss at rest also leave adult skin slower to recover after repeated friction and drying? This proposed mechanism asks whether layered lipid formulations create that trade-off in human skin organ culture. The comparison would match barrier and mechanical properties while varying lipids that block CD1a, an immune-recognition molecule. Delayed recovery should appear only when immune signalling is suppressed. Blocking CD1a should reproduce the delay; activating a person’s own CD1a-reactive T cells should restore recovery. Blocking interleukin-22, a brief repair signal, should remove that rescue. Initial damage, hydration, lipid organization and microcracks must match.