What role does FOXO3 play in Haut?

FOXO3 is a transcription factor that regulates cell cycle, apoptosis, and stress resistance. In the skin, FOXO3 contributes to protection against oxidative stress and UV damage by promoting the expression of antioxidant enzymes (e.g., SOD2, catalase) and DNA repair proteins. Studies in human skin cells and animal models suggest that reduced FOXO3 activity is linked to premature skin aging, decreased collagen synthesis, and increased susceptibility to skin damage. However, most evidence comes from in vitro and mouse models; direct human studies are limited. Some GWAS have associated FOXO3 variants with general longevity, but a specific effect on skin aging is not clearly established. Therefore, the predictive value of genetic tests for FOXO3 regarding skin health is low and should not be used alone for lifestyle decisions. A healthy lifestyle including sun protection, balanced nutrition, and stress management has a much greater impact on skin aging than individual gene variants.