Skeletal muscle stem cell (satellite cell) (MuSC (satellite cell))

Skeletal muscle stem cells (MuSCs or satellite cells) are a quiescent, tissue-resident population located between the plasma membrane of muscle fibers and the surrounding basal lamina[1][3]. They are essential for muscle regeneration following injury and for normal muscle tissue maintenance. In a resting state, they are mitotically inactive, characterized by Pax7 expression, and are activated upon injury or stress to proliferate, differentiate, and fuse to existing fibers or form new muscle. The balance between quiescence, activation, self-renewal, and differentiation is tightly controlled by molecular and environmental cues, including signaling pathways like Notch, Wnt, mTOR, and the local microenvironment (niche)[1][2][3][4][5]. Dysregulation of MuSCs is implicated in muscle-wasting diseases, impaired regeneration with aging, and some genetic muscular dystrophies. "Muscle stem cell compartment and muscle tissue" is not itself a targetable molecule or receptor but refers to a **stem cell population** and the associated tissue context critical for muscle regeneration and maintenance[1][2][3].

Other names

Muscle stem cellsatellite cellmyosatellite cellMuSC

Not applicable for direct drug targeting; small molecules, growth factors, or biologics may influence their proliferation/activation indirectly by modulating signaling pathways (e.g., Wnt inhibitors, mTOR activators, Notch modulators)