Alteration of STIM1/Orai1-mediated SOCE in skeletal muscle: Impact in genetic muscle diseases and beyond

E Conte, P Imbrici, P Mantuano, MA Coppola… - Cells, 2021 - mdpi.com
E Conte, P Imbrici, P Mantuano, MA Coppola, GM Camerino, A De Luca, A Liantonio
Cells, 2021mdpi.com
Intracellular Ca2+ ions represent a signaling mediator that plays a critical role in regulating
different muscular cellular processes. Ca2+ homeostasis preservation is essential for
maintaining skeletal muscle structure and function. Store-operated Ca2+ entry (SOCE), a
Ca2+-entry process activated by depletion of intracellular stores contributing to the
regulation of various function in many cell types, is pivotal to ensure a proper Ca2+
homeostasis in muscle fibers. It is coordinated by STIM1, the main Ca2+ sensor located in …
Intracellular Ca2+ ions represent a signaling mediator that plays a critical role in regulating different muscular cellular processes. Ca2+ homeostasis preservation is essential for maintaining skeletal muscle structure and function. Store-operated Ca2+ entry (SOCE), a Ca2+-entry process activated by depletion of intracellular stores contributing to the regulation of various function in many cell types, is pivotal to ensure a proper Ca2+ homeostasis in muscle fibers. It is coordinated by STIM1, the main Ca2+ sensor located in the sarcoplasmic reticulum, and ORAI1 protein, a Ca2+-permeable channel located on transverse tubules. It is commonly accepted that Ca2+ entry via SOCE has the crucial role in short- and long-term muscle function, regulating and adapting many cellular processes including muscle contractility, postnatal development, myofiber phenotype and plasticity. Lack or mutations of STIM1 and/or Orai1 and the consequent SOCE alteration have been associated with serious consequences for muscle function. Importantly, evidence suggests that SOCE alteration can trigger a change of intracellular Ca2+ signaling in skeletal muscle, participating in the pathogenesis of different progressive muscle diseases such as tubular aggregate myopathy, muscular dystrophy, cachexia, and sarcopenia. This review provides a brief overview of the molecular mechanisms underlying STIM1/Orai1-dependent SOCE in skeletal muscle, focusing on how SOCE alteration could contribute to skeletal muscle wasting disorders and on how SOCE components could represent pharmacological targets with high therapeutic potential.
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