Regulation of the muscle fiber microenvironment by activated satellite cells during hypertrophy

Christopher S. Fry, Jonah D. Lee, Janna R. Jackson, Tyler J. Kirby, Shawn A. Stasko, Honglu Liu, Esther E. Dupont-Versteegden, John J. McCarthy, Charlotte A. Peterson

Research output: Contribution to journalArticlepeer-review

210 Scopus citations


Our aim in the current study was to determine the necessity of satellite cells for long-term muscle growth and maintenance. We utilized a transgenic Pax7-DTA mouse model, allowing for the conditional depletion of > 90% of satellite cells with tamoxifen treatment. Synergist ablation surgery, where removal of synergist muscles places functional overload on the plantaris, was used to stimulate robust hypertrophy. Following 8 wk of overload, satellite celldepleted muscle demonstrated an accumulation of extracellular matrix (ECM) and fibroblast expansion that resulted in reduced specific force of the plantaris. Although the early growth response was normal, an attenuation of hypertrophy measured by both muscle wet weight and fiber cross-sectional area occurred in satellite cell-depleted muscle. Isolated primary myogenic progenitor cells (MPCs) negatively regulated fibroblast ECM mRNA expression in vitro, suggesting a novel role for activated satellite cells/MPCs in muscle adaptation. These results provide evidence that satellite cells regulate the muscle environment during growth.

Original languageEnglish
Pages (from-to)1654-1665
Number of pages12
JournalFASEB Journal
Issue number4
StatePublished - Apr 2014


  • Extracellular matrix
  • Fibroblast
  • Myogenic progenitor cells
  • Pax7
  • Tcf4

ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry
  • Molecular Biology
  • Genetics


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