The cellular signaling levers that pharma and lifestyle interventions target to influence aging: mTOR, AMPK, sirtuins, the NAD+ pathway, autophagy activation, and the caloric-restriction mimetics that act on them.
AMPK activation triggers cellular energy sensing and metabolic repair pathways linked to longevity, fat oxidation, and autophagy. Here is how it works.
Caloric restriction mimetics are compounds that activate the same cellular pathways as reduced calorie intake, targeting autophagy, AMPK, and sirtuins without actual fasting.
FOXO transcription factors regulate stress resistance, autophagy, and DNA repair. Learn how these proteins connect to lifespan and metabolic health.
Glycolysis and oxidative phosphorylation are the two core ATP-generating pathways in human cells, with distinct roles in aging, disease, and metabolic health.
The IGF-1 and growth hormone axis regulates cell growth, metabolism, and tissue repair. Learn its mechanisms, role in aging, and what the evidence shows.
The insulin signaling pathway governs how cells absorb glucose and regulate growth. Learn its mechanisms, links to aging, and what influences its function.
Ketogenesis is the metabolic pathway that converts fatty acids into ketone bodies for fuel. Learn the biochemistry, triggers, longevity links, and what to track.
Methionine restriction reduces intake of a sulfur amino acid linked to aging pathways, with animal evidence of lifespan extension and metabolic benefits.
Mitochondrial biogenesis is the process cells use to grow and divide mitochondria, sustaining energy production and metabolic health as organisms age.
The mTOR pathway controls cell growth, protein synthesis, and autophagy. Learn how it connects to aging, caloric restriction, and rapamycin research.
The NAD+ pathway governs cellular energy production, DNA repair, and aging. Learn how NAD+ declines with age and what interventions aim to restore it.
The Nrf2 pathway activates your cells' internal antioxidant and detoxification defenses. Learn how it works, what activates it, and its role in aging.
The PI3K-Akt pathway controls cell growth, metabolism, and survival. Learn how its activity shapes aging, cancer risk, and longevity interventions.
The polyamine pathway produces spermidine, putrescine, and spermine, small molecules that regulate cell growth, autophagy, and aging across tissues.
PPAR pathways are nuclear receptor systems that regulate fat burning, glucose metabolism, and inflammation, with direct relevance to metabolic aging.
Sirtuins are a family of enzymes that regulate DNA repair, metabolism, and stress resistance. Learn how they work, what activates them, and what the evidence shows.
Methionine restriction extends lifespan in yeast by reducing S-adenosylmethionine production, which prevents methylation of protein phosphatase 2A and triggers sustained autophagy. Early-stage methionine restriction appears sufficient to activate this longevity pathway, suggesting a potential therapeutic target for human healthspan extension without sustained dietary restriction.
Precise structural modifications to PI3K reveal that single amino acid changes can decouple lifespan, growth, and developmental timing through distinct signaling pathways. A gain-of-function mutation accelerates aging, while disruption of the Ras-binding interface extends growth and delays reproductive entry—demonstrating that PI3K outputs are context-dependent rather than monolithic.
Cambrian Bio's ATX-304 demonstrated in Phase 1b trials the ability to activate AMPK, a cellular energy regulator that declines with age. Participants showed improvements in liver fat, visceral adiposity, triglycerides, and resting metabolic rate without safety concerns—validating a mechanism long pursued in longevity research.
SIRT6, a sirtuin protein, protects against neurodegenerative diseases by maintaining nucleolar function and constraining protein synthesis, preventing the accumulation of misfolded proteins that drives age-related brain pathology. This mechanism represents a direct intervention point in proteostasis failure, a primary driver of cognitive decline.
PGC-1α, a transcriptional coactivator that regulates cellular energy metabolism and mitochondrial biogenesis, is emerging as a target for age-related disease intervention. Endurance Bio is advancing a small molecule (T-168) designed to upregulate PGC-1α, with Phase 2 trials underway in Parkinson's disease and potential applications across neurodegeneration, metabolic dysfunction, and frailty.
Age-related decline in the sirtuin AcSirt2 impairs mitochondrial quality control in honey bees, while restoring this protein activates a FOXO-dependent pathway that clears damaged mitochondria, reduces oxidative stress, and extends lifespan. This mechanism identifies a conserved axis for mitochondrial homeostasis relevant to aging across species.
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