Sarcopenia (age-related muscle loss) is a major driver of disability in older adults. Current understanding of muscle aging focuses on protein synthesis, mitochondrial function, and cellular senescence, but emerging evidence points to regulatory molecules called circular RNAs as potentially important players. Unlike ordinary RNA, circRNAs form closed loops, making them highly stable and capable of long-lasting effects on gene expression.
This paper is a narrative review synthesizing published research on circRNAs in muscle biology and aging. The authors examine how circRNAs regulate key processes: myogenesis (muscle cell formation), satellite cell activation (stem cells critical for muscle repair), protein synthesis, and senescence. They then discuss whether exercise—particularly resistance and endurance training—alters circRNA expression in ways that could explain exercise's anti-aging benefits. The proposed mechanisms include circRNAs acting as "sponges" that trap microRNAs, thereby regulating target genes involved in muscle maintenance.
The review acknowledges significant limitations: most circRNA research remains in early-stage cell and animal models, functional validation is sparse, results vary widely across species and exercise protocols, and the precise molecular pathways by which circRNAs mediate exercise benefits remain unknown. The authors emphasize that while circRNA dysregulation correlates with aging and muscle loss, causality has not been established in humans. No human exercise intervention trials specifically measuring circRNA responses and muscle outcomes were identified in sufficient detail to draw firm conclusions.
This review sits at an early knowledge stage—useful for hypothesis generation but not yet actionable evidence. It highlights a plausible biological mechanism but does not provide the mechanistic clarity or human validation needed to inform clinical practice or predict therapeutic utility. The field would benefit from prospective, well-controlled human studies measuring circRNA expression, muscle quality, and functional outcomes over time in exercisers versus controls.
For longevity research, this work usefully maps an understudied regulatory layer in muscle aging. However, the gap between circRNA biology in petri dishes and human muscle adaptation remains large. Until functional studies in humans demonstrate that exercise-induced circRNA changes causally drive muscle preservation, this remains a promising lead rather than an established intervention target.
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