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Thermal stimulation at 39°C facilitates the fusion and elongation of C2C12 myoblasts
Authors:Satoko Hayashi  Shinichi Yonekura
Abstract:The aim of this study was to determine the effect of thermal stimulation at 39°C on the fusion and elongation of skeletal muscle cells. During a 5 day differentiation process of C2C12 cells, nine groups subjected to varying lengths of thermal stimulation at 39°C were established. Afterward, all groups were immunostained using anti‐muscle heavy‐chain antibody to test for myotube formation. Quantification of the myotube area demonstrated a significant increase in the group subjected to thermal stimulation at 39°C during the latter half of the differentiation compared with the control group, but the fusion index was significantly higher in the group that received hyperthermic treatment during the first half of the differentiation period. Moreover, the longitudinal length of myotubes was significantly increased in the groups that were subjected to thermal stimulation at 39°C during the latter half of the differentiation period. The distance between the center of myotubes and the nucleus farthest away from the center was substantially extended in the group receiving thermal stimulation at 39°C only on the fourth day of the differentiation. Together, these results demonstrate that thermal stimulation at 39°C facilitates myoblast fusion and elongation.
Keywords:differentiation  fusion  mild heat stress  myotube  nuclear migration
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