Pharmacologic AMPK Activation Extends Lifespan in C. elegans and Improves Aspects of Healthspan in Mice
Dysregulated energy metabolism is a hallmark of aging. Many interventions that extend lifespan converge on the conserved master regulator of energy metabolism, AMP-activated kinase (AMPK), and direct genetic activation of AMPK extends lifespan in multiple species. Here, we test the ability of a specific and potent pharmacologic AMPK activator, MK-8722, to extend lifespan in C. elegans and improve healthspan in aged mice. Treatment with MK-8722 from adulthood significantly extended lifespan in an AMPK-dependent manner in both wildtype and Cockayne syndrome model csb-1 mutant C. elegans, without impairing motility or reproductive capacity. Mice treated with MK-8722 from 18 until 24 months of age had significantly reduced body fat accumulation, blocked age-associated declines in fasting blood glucose and enhanced circadian rhythmicity in respiratory quotient, suggesting an improved overall metabolic state. Hepatic RNA sequencing revealed a decrease in inflammation-related pathways and an increase in sterol metabolic pathways, which was consistent with significantly increased levels of multiple sterol-derived metabolites, including lithocholic acid, a proposed mediator of the benefits of caloric restriction. Our results support pharmacologic AMPK activation as a promising gerotherapeutic strategy.