Cytoskeletal control of myogenesis: a desmin null mutation blocks the myogenic pathway during embryonic stem cell differentiation

Developmental Biology
Georg WeitzerY Capetanaki

Abstract

A differentiating system based on embryonic stem (ES) cell-derived embryoid bodies (EBs) which recapitulates the in vivo cardiac, skeletal, and smooth muscle myogenesis of mouse embryos was developed and used to investigate the effects of the disruption of the desmin gene on muscle cell differentiation. Wild-type, heterozygous, and homozygous cell lines with the mutated desmin allele were evaluated. Skeletal myogenesis was totally inhibited in desmin null mutant EBs, as manifested by the absence of myotube formation, contractility, and myoD, myogenin, myf5, and myosin heavy chain expression. Smooth muscle formation was also completely blocked in the absence of desmin. On the other hand, there were no obvious effects on cardiomyocyte differentiation in these desmin null mutant EBs. However, reduced desmin expression in EBs heterozygous for the desmin mutation leads to partial inhibition of cardiac muscle formation. These data suggest that in contrast to early cardiocyte differentiation, desmin is indispensable for skeletal and smooth muscle formation.

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