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• W2121460378 abstract "Mesenchymal progenitor cells can be differentiated in vitro into myotubes that exhibit many characteristic features of primary mammalian skeletal muscle fibers. However, in general, they do not show the functional excitation-contraction coupling or the striated sarcomere arrangement typical of mature myofibers. Epigenetic modifications have been shown to play a key role in regulating the progressional changes in transcription necessary for muscle differentiation. In this study, we demonstrate that treatment of murine C2C12 mesenchymal progenitor cells with 10 μM of the DNA methylation inhibitor 5-azacytidine (5AC) promotes myogenesis, resulting in myotubes with enhanced maturity as compared to untreated myotubes. Specifically, 5AC treatment resulted in the up-regulation of muscle genes at the myoblast stage, while at later stages nearly 50% of the 5AC-treated myotubes displayed a mature, well-defined sarcomere organization, as well as spontaneous contractions that coincided with action potentials and intracellular calcium transients. Both the percentage of striated myotubes and their contractile activity could be inhibited by 20 nM TTX, 10 μM ryanodine, and 100 μM nifedipine, suggesting that action potential-induced calcium transients are responsible for these characteristics. Our data suggest that genomic demethylation induced by 5AC overcomes an epigenetic barrier that prevents untreated C2C12 myotubes from reaching full maturity.—Hupkes, M., Jonsson, M. K. B., Scheenen, W. J., van Rotterdam, W., Sotoca, A. M., van Someren, E. P., van der Heyden, M. A. G., van Veen, T. A., van Ravestein-van Os, R. I., Bauerschmidt, S., Piek, E., Ypey, D. L., van Zoelen, E. J., Dechering, K. J. Epigenetics: DNA demethylation promotes skeletal myotube maturation. FASEB J. 25, 3861–3872 (2011). www.fasebj.org" @default.
• W2121460378 created "2016-06-24" @default.
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• W2121460378 date "2011-07-27" @default.
• W2121460378 modified "2023-09-27" @default.
• W2121460378 title "Epigenetics: DNA demethylation promotes skeletal myotube maturation" @default.
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• W2121460378 doi "https://doi.org/10.1096/fj.11-186122" @default.
• W2121460378 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21795504" @default.
• W2121460378 hasPublicationYear "2011" @default.
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