Characterization of Pax3-expressing cells from adult blood vessels

Olivier Goupille, Giorgia Pallafacchina, Frédéric Relaix, Simon J. Conway, Ana Cumano, Benoit Robert, Didier Montarras, Margaret Buckingham

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We report expression of Pax3, an important regulator of skeletal muscle stem cell behaviour, in the brachial and femoral arteries of adult mice. In these contractile arteries of the limb, but not in the elastic arteries of the trunk, bands of GFP-positive cells were observed in Pax3 GFP/+ mice. Histological and biochemical examination of the vessels, together with clonal analysis after purification of Pax3-GFPpositive cells by flow cytometry, established their vascular smooth muscle identity. These blood-vessel-derived cells do not respond to inducers of other mesodermal cell types, such as bone, however, they can contribute to muscle fibre formation when co-cultured with skeletal muscle cells. This myogenic conversion depends on the expression of Pax3, but is rare and non-cell autonomous as it requires cell fusion. Myocardin, which promotes acquisition of a mature smooth muscle phenotype in these Pax3-GFP-positive cells, antagonises their potential for skeletal muscle differentiation. Genetic manipulation shows that myocardin is, however, positively regulated by Pax3, unlike genes for other myocardin-related factors, MRTFA, MRTFB or SRF. Expression of Pax3 overlaps with that reported for Msx2, which is required for smooth muscle differentiation of blood vessel-derived multipotent mesoangioblasts. These observations are discussed with respect to the origin and function of Pax3-expressing cells in blood vessels, and more general questions of cell fate determination and adult cell plasticity and reprogramming.

Original languageEnglish (US)
Pages (from-to)3980-3988
Number of pages9
JournalJournal of cell science
Issue number23
StatePublished - Dec 2011


  • Myocardin
  • Pax3
  • Skeletal muscle
  • Vascular smooth muscle

ASJC Scopus subject areas

  • Cell Biology

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