Skeletal muscle functions as a secretory organ, releasing extracellular vesicles carrying proteins, lipids, metabolites, and regulatory RNAs that modulate bone, brain, and tumor tissue at a distance. Aging alters vesicle production and cargo composition, shifting these signals from regenerative toward inflammatory and metabolically disruptive, while exercise reshapes them in the opposite direction. This positions muscle vesicle signaling as both a measurable marker of systemic aging and a potential therapeutic target.
Key Points
- Muscle vesicles carry RNA and protein cargo to distant organs
- Aging shifts vesicle cargo from protective toward inflammatory signaling
- Exercise remodels vesicle release, supporting stem cell and tissue function
Longevity Analysis
Muscle mass has long been correlated with survival, and vesicle-mediated signaling offers a mechanistic account of why: contracting tissue broadcasts instructions that reach bone, neural tissue, and immune-metabolic pathways throughout the body. The same cargo that supports regeneration in younger tissue contributes to chronic inflammation and stem cell exhaustion when production patterns degrade with age. Training load, measured and sustained rather than episodic, becomes the practical lever on a signaling network that no supplement currently replicates, and circulating vesicle profiles may eventually allow that signaling to be read directly rather than inferred from strength or mass.
Original published by Wiley Aging Cell, by Weiyi Jiang, Kenon Chua, Joe Young, Eng King Tan, Hong‐Wen Tang .