Stem cells and their derivatives can bypass the requirement of myocardin for smooth muscle gene expression

G. C Teg Pipes, Sanjay Sinha, Xiaoxia Qi, Chun Hong Zhu, Teresa D. Gallardo, John Shelton, Esther E. Creemers, Lillian Sutherland, James A. Richardson, Daniel J. Garry, Woodring E. Wright, Gary K. Owens, Eric N. Olson

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


The Serum Response Factor (SRF) coactivator myocardin stimulates the transcription of multiple muscle genes during cardiac and smooth muscle development. Mouse embryos lacking myocardin die during the earliest stages of smooth muscle development and fail to express multiple smooth muscle marker genes in the embryonic dorsal aorta and other vascular structures. In this study, we used mutant embryonic stem cell lines to further define the role of myocardin in smooth muscle differentiation and vascular development. Misexpression of myocardin in undifferentiated muscle stem cells resulted in efficient activation of smooth muscle genes, and weaker activation of genes involved in cardiac and skeletal muscle differentiation. Remarkably, myocardin-/- embryonic stem cell lines differentiated into smooth muscle cells in vitro, although these cells expressed significantly decreased levels of smooth muscle contractile genes. Moreover, genetically labeled myocardin-/- ES cells were able to contribute to smooth muscle lineages in vivo. These results indicate that while myocardin function is sufficient for activation of SRF-dependent muscle gene expression in multiple cell types, myocardin-independent mechanism(s) can suffice for expression in some smooth muscle lineages.

Original languageEnglish (US)
Pages (from-to)502-513
Number of pages12
JournalDevelopmental Biology
Issue number2
StatePublished - Dec 15 2005


  • Differentiation and transcription
  • Myocardin
  • Smooth muscle
  • Stem cells

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology


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