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• W2005491317 endingPage "26" @default.
• W2005491317 startingPage "11" @default.
• W2005491317 abstract "The ability of skeletal muscle myoblasts to differentiate in the absence of spontaneous fusion was studied in cultures derived from chicken embryo leg muscle, rat myoblast lines L6 and L8, and the mouse myoblast line G8. Following 48–96 hr of culture in a low-Ca2+ (25 μm), Mg2+-depleted medium, chicken myoblasts exhibited only 3–5% fusion whereas up to 64% of the cells fused in control cultures. Depletion of Mg2+ led to preferential elimination of fibroblasts, with the result that 97% of the mononucleated cells remaining at 120 hr exhibited a bipolar morphology and stained with antibodies directed against M-creatine kinase, skeletal muscle myosin, and desmin. Mononucleated myoblasts rarely showed visible cross-striations or M-line staining with anti-myomesin unless the medium was supplemented with 0.81 mM Mg2+, suggesting that Mg2+ plays a role in sarcomere assembly. Conditions of Ca2+ and Mg2+ depletion inhibited myoblast fusion in the rodent cell lines as well, but mononucleated myoblasts failed to differentiate under these conditions. Differentiated individual myoblasts from rat cell lines and from chicken cell cultures were obtained when fusion was inhibited by growth in cytochalasin B (CB). CB-treated rat myoblast cultures accumulated MM-CK to nearly twice the specific activity found in extensively fused control cultures of comparable age. Spherical cells which accumulated during CB treatment were isolated and shown to contain nearly eight times the CK specific activity present in nonspherical cells from the same cultures. Approximately 90% of these cells exhibited immunofluorescent staining with antibodies to skeletal muscle myosin, failed to incorporate [3H]thymidine or to form colonies in clonal subculture, and thus represent terminally differentiated rat myoblasts. Quantitative microfluorometric DNA measurements on individual nuclei demonstrated that the terminally differentiated myoblasts obtained in these experiments from both chicken and rat contain 2cDNA levels, suggesting arrest in the G0 stage of the cell cycle." @default.
• W2005491317 created "2016-06-24" @default.
• W2005491317 creator A5014807279 @default.
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• W2005491317 date "1982-05-01" @default.
• W2005491317 modified "2023-09-26" @default.
• W2005491317 title "Isolation and characterization of terminally differentiated chicken and rat skeletal muscle myoblasts" @default.
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• W2005491317 doi "https://doi.org/10.1016/0012-1606(82)90003-3" @default.
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