TRIM32 regulates skeletal muscle stem cell differentiation and is necessary for normal adult muscle regeneration

PLoS One. 2012;7(1):e30445. doi: 10.1371/journal.pone.0030445. Epub 2012 Jan 27.

Abstract

Limb girdle muscular dystrophy type 2H (LGMD2H) is an inherited autosomal recessive disease of skeletal muscle caused by a mutation in the TRIM32 gene. Currently its pathogenesis is entirely unclear. Typically the regeneration process of adult skeletal muscle during growth or following injury is controlled by a tissue specific stem cell population termed satellite cells. Given that TRIM32 regulates the fate of mammalian neural progenitor cells through controlling their differentiation, we asked whether TRIM32 could also be essential for the regulation of myogenic stem cells. Here we demonstrate for the first time that TRIM32 is expressed in the skeletal muscle stem cell lineage of adult mice, and that in the absence of TRIM32, myogenic differentiation is disrupted. Moreover, we show that the ubiquitin ligase TRIM32 controls this process through the regulation of c-Myc, a similar mechanism to that previously observed in neural progenitors. Importantly we show that loss of TRIM32 function induces a LGMD2H-like phenotype and strongly affects muscle regeneration in vivo. Our studies implicate that the loss of TRIM32 results in dysfunctional muscle stem cells which could contribute to the development of LGMD2H.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult Stem Cells / metabolism
  • Adult Stem Cells / physiology*
  • Animals
  • Cell Differentiation / genetics*
  • Cell Proliferation
  • Cells, Cultured
  • Female
  • Mice
  • Mice, Knockout
  • Muscle Development / genetics
  • Muscle Development / physiology
  • Muscles / metabolism
  • Muscles / physiology*
  • Muscular Dystrophies, Limb-Girdle / genetics
  • Muscular Dystrophies, Limb-Girdle / pathology
  • Regeneration / genetics*
  • Regeneration / physiology
  • Satellite Cells, Skeletal Muscle / metabolism
  • Satellite Cells, Skeletal Muscle / physiology
  • Ubiquitin-Protein Ligases / genetics
  • Ubiquitin-Protein Ligases / metabolism
  • Ubiquitin-Protein Ligases / physiology*

Substances

  • TRIM32 protein, mouse
  • Ubiquitin-Protein Ligases

Supplementary concepts

  • Limb-girdle muscular dystrophy type 2H