Mechanisms of muscle degeneration, regeneration, and repair in the muscular dystrophies

Gregory Q. Wallace, Elizabeth M. McNally

Research output: Contribution to journalReview articlepeer-review

219 Scopus citations

Abstract

To withstand the rigors of contraction, muscle fibers have specialized protein complexes that buffer against mechanical stress and a multifaceted repair system that is rapidly activated after injury. Genetic studies first identified the mechanosensory signaling network that connects the structural elements of muscle and, more recently, have identified repair elements of muscle. Defects in the genes encoding the components of these systems lead to muscular dystrophy, a family of genetic disorders characterized by progressive muscle wasting. Although the age of onset, affected muscles, and severity vary considerably, all muscular dystrophies are characterized by muscle necrosis that overtakes the regenerative capacity of muscle. The resulting replacement of muscle by fatty and fibrous tissue leaves muscle increasingly weak and nonfunctional. This review discusses the cellular mechanisms that are primarily and secondarily disrupted in muscular dystrophy, focusing on membrane degeneration, muscle regeneration, and the repair of muscle.

Original languageEnglish (US)
Pages (from-to)37-57
Number of pages21
JournalAnnual review of physiology
Volume71
DOIs
StatePublished - Mar 2009

Keywords

  • Dysferlin
  • Dystrophin
  • Lamin A/C
  • Nitric oxide synthase
  • Sarcoglycan

ASJC Scopus subject areas

  • Physiology

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