Here we explain the three molecular axes for achieving Skin Longevity at the cellular level.
Axis 1: Telomere Stability Maintenance
Telomeres are protective structures at chromosome ends that shorten with each cell division. Upon reaching a critical length, the p53/p21 pathway activates and halts the cell cycle (= cellular senescence). Since UV-induced DNA damage accelerates telomere shortening, antioxidant ingredients indirectly contribute to telomere protection through prevention.
Axis 2: NAD+ Level Maintenance
NAD+ is the central molecule for cellular energy metabolism and repair processes. By the 50s, it declines to approximately 50% of levels seen in the 20s. The major pathways driven by NAD+ include SIRT1 (epigenetic regulation, inflammation suppression) and PARP1 (DNA repair). Niacinamide is the most practical precursor for replenishing NAD+ via the salvage pathway.
Axis 3: Autophagy Maintenance
Autophagy is a "cellular self-cleaning" mechanism that degrades and recycles damaged organelles and proteins. Its age-related decline leads to accumulation of oxidatively damaged proteins. Trehalose and resveratrol induce autophagy through mTOR-independent pathways.
Interconnection of the Three Axes
NAD+ -> SIRT1 activation -> autophagy promotion -> removal of damaged proteins. Simultaneously, PARP1 activation -> DNA repair -> telomere protection -> delayed cellular senescence -> SASP suppression -> prevention of chronic inflammation = Skin Longevity.
System Health, Not Output
Anti-aging focuses on "output," while Skin Longevity focuses on "system health (homeostasis)."
To use a car analogy: anti-aging is "repairing body scratches." Skin Longevity is "properly maintaining the engine and oil so the car can keep running for a long time."
References
Key peer-reviewed sources behind the scientific statements in this article.
- Herbig U, Jobling WA, Chen BPC, Chen DJ, Sedivy JM. Telomere shortening triggers senescence of human cells through a pathway involving ATM, p53, and p21(CIP1), but not p16(INK4a). Mol Cell. 2004;14(4):501–513. PubMed
- Verdin E. NAD+ in aging, metabolism, and neurodegeneration. Science. 2015;350(6265):1208–1213.
- Park D, Jeong H, Lee MN, et al. Resveratrol induces autophagy by directly inhibiting mTOR through ATP competition. Sci Rep. 2016;6:21772. PubMed