Autophagy Emerges as Key Mechanism Behind Healthy Aging Interventions

Autophagy, the cellular process that recycles damaged components and maintains cellular health, has emerged as a critical mechanism underlying successful aging interventions. This extensive review by researchers at the Buck Institute synthesizes evidence showing how diverse longevity strategies—from pharmaceutical compounds to lifestyle modifications—converge on enhancing autophagy to promote healthy aging.

The authors examined studies across multiple model organisms (yeast, nematodes, fruit flies, mice) and humans, focusing on interventions where autophagy plays a demonstrable causal role in extending lifespan and healthspan. Key pharmacological interventions include rapamycin (an mTOR inhibitor), metformin (diabetes drug), spermidine (polyamine compound), resveratrol, NAD+ precursors, and urolithin A—all of which enhance autophagy through different molecular pathways while extending lifespan in model organisms.

Lifestyle factors showed equally compelling connections to autophagy. Dietary restriction, perhaps the most robust longevity intervention known, consistently upregulates autophagy across species. Exercise enhances autophagy in muscle and other tissues, contributing to its anti-aging effects. Sleep optimization and temperature modulation also influence autophagy, though these areas require more research. The review emphasizes that autophagy decline is a hallmark of aging, making interventions that restore this process particularly valuable.

The clinical implications are significant, as many of these interventions are already available or under investigation in humans. However, the authors note a critical gap: reliable, non-invasive methods to measure autophagy in humans remain limited, hampering translation of findings from model organisms to clinical practice. This limitation underscores the need for better biomarkers and longitudinal studies linking autophagy dynamics to human health outcomes.