FGF13 declines sharply in the aging brain of mice and macaques, with the steepest losses in astrocytes of the medial prefrontal cortex. Deleting it in cortical astrocytes accelerated aging phenotypes and neurological decline, while restoring it preserved cognition by binding Phafin2 to sustain astrocyte autophagy, limit neuronal damage, and suppress microglial inflammatory output.
Key Points
- FGF13 falls in aging prefrontal cortex astrocytes across mice and macaques
- Astrocyte FGF13 loss accelerates aging; overexpression delays cognitive decline
- FGF13-Phafin2 binding drives autophagy, reducing microglial inflammatory signaling
Longevity Analysis
Cognitive aging is framed here as a failure of cellular housekeeping in support cells rather than a primary neuronal defect: when astrocytes lose the capacity to clear damaged cargo, microglia shift toward inflammatory output and the neuronal environment deteriorates. That sequence places autophagic competence and inflammatory restraint at the center of how the brain regenerates and defends itself over decades. It also reinforces why interventions that reduce chronic inflammatory load and support autophagic flux — sleep architecture, nutrient timing, metabolic control, and limiting sources of persistent immune activation — carry weight well beyond their peripheral effects.
Original published by Wiley Aging Cell, by Rui Zheng, Zheng Tu, Yang Fang, Caixiang Zhuang, Yuchao Zhang, Yibo Ying, Zhiyi Feng, Ziyang Jin, Yanyan Zheng, Zhouguang Wang .