CCAAT/enhancer binding protein beta is expressed in satellite cells and controls myogenesis

François Marchildon, Neena Lala, Grace Li, Catherine St.-Louis, Daniel Lamothe, Charles Keller, Nadine Wiper-Bergeron

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Upon injury, muscle satellite cells become activated and produce skeletal muscle precursors that engage in myogenesis. We demonstrate that the transcription factor CCAAT/enhancer binding protein beta (C/EBPβ) is expressed in the satellite cells of healthy muscle. C/EBPβ expression is regulated during myogenesis such that C/EBPβ is rapidly and massively downregulated upon induction to differentiate. Furthermore, persistent expression of C/EBPβ in myoblasts potently inhibits differentiation at least in part through the inhibition of MyoD protein function and stability. As a consequence, myogenic factor expression, myosin heavy chain expression, and fusogenic activity were reduced in C/EBPβ-overexpressing cells. Using knockout models, we demonstrate that loss of Cebpb expression in satellite cells results in precocious differentiation of myoblasts in growth conditions and greater cell fusion upon differentiation. In vivo, loss of Cebpb expression in satellite cells resulted in larger muscle fiber cross-sectional area and improved repair after muscle injury. Our results support the notion that C/EBPβ inhibits myogenic differentiation and that its levels must be reduced to allow for activation of MyoD target genes and the progression of differentiation.

Original languageEnglish (US)
Pages (from-to)2619-2630
Number of pages12
JournalStem Cells
Volume30
Issue number12
DOIs
StatePublished - Dec 1 2012

Keywords

  • CCAAT-enhancer binding protein beta
  • Muscle development
  • MyoD1 myogenic differentiation protein
  • Satellite cells
  • Skeletal muscle

ASJC Scopus subject areas

  • Molecular Medicine
  • Developmental Biology
  • Cell Biology

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  • Cite this

    Marchildon, F., Lala, N., Li, G., St.-Louis, C., Lamothe, D., Keller, C., & Wiper-Bergeron, N. (2012). CCAAT/enhancer binding protein beta is expressed in satellite cells and controls myogenesis. Stem Cells, 30(12), 2619-2630. https://doi.org/10.1002/stem.1248