Muscle mass preservation pathway

The "muscle mass preservation pathway" is not a specific molecule or receptor, but refers collectively to a network of molecular signaling pathways that regulate the maintenance and growth of skeletal muscle mass. Key molecular components include the mTOR (mammalian target of rapamycin) signaling pathway, which promotes protein synthesis and inhibits protein breakdown; the Insulin-like growth factor 1 (IGF-1)/PI3K/Akt axis, which activates mTOR and suppresses catabolic transcription factors; myostatin signaling (transforming growth factor β superfamily), which inhibits muscle growth; and regulators of proteolysis such as the ubiquitin-proteasome system and autophagy-lysosome system[1][2][4][6]. Additional regulators involve the wnt/β-catenin pathway (satellite cell proliferation and regeneration), FOXO transcription factors (protein degradation), and growth hormone signaling modulators such as BCL6[5][6]. Because the term does not represent a molecular target but a broad physiological process involving many pathways, it does not conform to target annotation conventions.\n\nIn summary, "Muscle mass preservation pathway" is not a canonical, actionable molecular target, and therefore structured information at the molecular target level should not be assigned. Instead, refer to specific pathway components such as "mTOR," "IGF-1 receptor," "Myostatin," or "FOXO transcription factors" depending on the scientific or clinical context[1][2][4][6].