title: Fetal muscle contains different CD34+ cell subsets that distinctly differentiate into adipogenic, angiogenic and myogenic lineages.
abstract: We have previously demonstrated that CD34(+) cells isolated from fetal mouse muscles are an interesting source of myogenic progenitors. In the present work, we pinpoint the tissue location of these CD34(+) cells using cell surface and phenotype markers. In order to identify the myogenic population, we next purified different CD34(+) subsets, determined their expression of relevant lineage-related genes, and analyzed their differentiation capacities in vitro and in vivo. The CD34(+) population comprised a CD31(+)/CD45(-) cell subset exhibiting endothelial characteristics and only capable of forming microvessels in vivo. The CD34(+)/CD31(-)/CD45(-)/Sca1(+) subpopulation, which is restricted to the muscle epimysium, displayed adipogenic differentiation both in vitro and in vivo. CD34(+)/CD31(-)/CD45(-)/Sca1(-) cells, localized in the muscle interstitium, transcribed myogenic genes, but did not display the characteristics of adult satellite cells. These cells were distinct from pericytes and fibroblasts. They were myogenic in vitro, and efficiently contributed to skeletal muscle regeneration in vivo, although their myogenic potential was lower than that of the unfractionated CD34(+) cell population. Our results indicate that angiogenic and adipogenic cells grafted with myogenic cells enhance their contribution to myogenic regeneration, highlighting the fundamental role of the microenvironment on the fate of transplanted cells.
authors: CNRS UMR 6204, Nantes, F-44322, France. Tanaelle.Dupas@univ-nantes.fr
authors: Tanaelle
authors: T
authors: Dupas
authors: Thierry
authors: T
authors: Rouaud
authors: Karl
authors: K
authors: Rouger
authors: Blandine
authors: B
authors: Lieubeau
authors: Chrystelle
authors: C
authors: Cario-Toumaniantz
authors: Josiane
authors: J
authors: Fontaine-Pérus
authors: Marie-France
authors: MF
authors: Gardahaut
authors: Gwenola
authors: G
authors: Auda-Boucher
mesh_terms: D050156:Adipogenesis; D000818:Animals; D018952:Antigens, CD34 / Q000378:metabolism*; D002454:Cell Differentiation; D019070:Cell Lineage; D005333:Fetus / Q000166:cytology*; D005434:Flow Cytometry; D007150:Immunohistochemistry; D017493:Leukocyte Common Antigens / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D024510:Muscle Development; D018482:Muscle, Skeletal / Q000166:cytology* / Q000196:embryology / Q000378:metabolism; D018919:Neovascularization, Physiologic; D010641:Phenotype; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000378:metabolism
chemical_list: D018952:Antigens, CD34; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D017493:Leukocyte Common Antigens