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Skeletal muscle satellite cells: Mediators of muscle growth during development and implications for developmental disorders #MMPMID25186345
Dayanidhi S; Lieber RL
Muscle Nerve 2014[Nov]; 50 (5): 723-32 PMID25186345show ga
Satellite cells (SCs) are the muscle stem cells responsible for longitudinal and cross-sectional postnatal growth, repair after injury and which provide new myonuclei when needed. Here we review their morphology, contribution to development, and their role in sarcomere and myonuclear addition. SCs, similar to other tissue stem cells, cycle through different states such as quiescence, activation, and self-renewal and thus we consider the signaling mechanisms involved in maintenance of these states. The role of the SC niche, their interactions with other cells such as fibroblasts and the extracellular matrix are all emerging as important factors that affect aging and disease. Interestingly, children with cerebral palsy appear to have a reduced SC number, which could play a role in their reduced muscular development and even in muscular contracture formation. Finally we review the current information on SC dysfunction in children with muscular dystrophy and emerging therapies that target promotion of myogenesis and reduction of fibrosis.