Nature agingMar 2, 2026

Exercise may improve thinking problems in Alzheimer's mice by using muscle-released particles to help brain immune cells clear plaques

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗

Updated Jun 27, 2026

Abstract

Essence

Swimming exercise may ease cognitive impairment in Alzheimer's disease mice through skeletal muscle extracellular vesicles that help microglia clear amyloid-beta plaques.

Evidence

This mouse and cell-model experiment used gain- and loss-of-function tests to trace exercise-induced skeletal muscle-derived extracellular vesicles, miR-378a-3p cargo, microglial uptake, plaque clearance, and cognition in AD mice.

Caveat

The therapeutic claim is limited to preclinical AD models and engineered myotube-derived vesicles, not tested human Alzheimer's disease treatment.

Simplified

Exercise confers cognitive benefits in Alzheimer's disease (AD), yet the underlying mechanisms remain incompletely understood. Skeletal muscle functions as an endocrine organ that secretes myokines which affect the homeostasis of extra-muscular organs, including the brain. Here we found that swimming exercise promotes secretion of skeletal muscle-derived extracellular vesicles (SKM-EVs), which are subsequently taken up via pinocytosis by microglia. Gain-of-function and loss-of-function experiments showed that exercise-induced SKM-EVs induce polarization of disease-associated microglia and enhance the clearance of amyloid-beta plaques. Furthermore, miR-378a-3p was identified as a key microRNA cargo in SKM-EVs, regulating lipid metabolism in disease-associated microglia by targeting p110α. Importantly, administration of extracellular vesicles derived from miR-378a-overexpressing myotubes alleviated cognitive impairment in AD mice. Together, our findings demonstrate that exercise-induced SKM-EVs could serve as a myokine, mediating communication from skeletal muscle to the brain, providing a potential exercise-mimicking therapeutic strategy for AD.