Recent advancements in understanding exerkines—signaling molecules produced by muscle tissue in response to physical activity—highlight their role in promoting beneficial outcomes across various cell types and tissues. This review emphasizes the importance of extracellular vesicles (EVs), particularly exosomes, as carriers of these exerkines, facilitating intercellular communication and influencing systemic health. The shift from traditional soluble factors to recognizing the significance of EVs marks a pivotal change in how we perceive muscle-tissue signaling and its broader implications for healthspan.

The review consolidates evidence supporting the exerkine hypothesis, which posits that the systemic benefits of exercise are partly mediated by the modulation of exosomal cargo. Exercise-induced exosomes contain a diverse array of proteins, lipids, and non-coding RNAs that contribute to muscle health by regulating muscle stem cell activation, combating age-related decline such as sarcopenia, and enhancing metabolic interactions with tissues like adipose. The physiological effects of exosomes are influenced not only by their cargo but also by the state of recipient tissues, including factors like aging, inflammation, and insulin resistance, underscoring the complexity of EV-mediated signaling.

A critical takeaway from this review is the burgeoning potential for engineered exosomes as therapeutic tools for musculoskeletal health. However, significant challenges remain, particularly related to the standardization of methodologies and the establishment of regulatory frameworks for their clinical application. This insight prompts a reevaluation of current research paradigms and drug development timelines, suggesting that as our understanding of exosomal biology deepens, we may unlock new avenues for interventions aimed at enhancing healthspan and mitigating age-associated decline.

Source: fightaging.org