Increased proliferation and delayed differentiation of adult primary myoblasts derived from MyoDR99,102 mice. Increased proliferation and delayed differentiation.

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Increased proliferation and delayed differentiation of adult primary myoblasts derived from MyoDR99,102 mice. Increased proliferation and delayed differentiation of adult primary myoblasts derived from MyoDR99,102 mice. (A) Primary myoblasts were isolated from the indicated skeletal muscle of wild‐type (WT) and MyoDR99,102 (R99,102/R99,102) mice. After 5 days in culture, cells were fixed and stained for MyoD and desmin. The percentage of MyoD/desmin‐positive cells in the total number of nuclei from individual mice is presented. (B,C) Impaired differentiation of passage‐3 myoblasts, from the muscles of the hind leg of WT and MyoDR99,102 mice, placed under differentiation conditions and monitored for 72 h. (B) Western blot; (C) phase contrast; upper left corner: number of myotubes per field. (D) Downregulation of Myf‐5 further decreases differentiation. Passage‐5 myoblasts from the muscles of the hind leg of WT and MyoDR99,102 mice were depleted of Myf‐5 by RNA interference, placed under differentiating conditions and analysed by western blot as in (B); the results obtained with two distinct Myf‐5 short interfering RNAs (siRNAs) or a control scrambled siRNA are shown. (Phase contrast of the same samples is given in supplementary information S4 online.) MCK, muscle creatine kinase; MHC, myosin heavy chain; R, Arg, arginine; α‐Tubulin, used as a loading control. Arnaud Duquet et al. EMBO Rep. 2006;7:1140-1146 © as stated in the article, figure or figure legend