Abstract
The objective of this study was to investigate the effects of mesenchymal cells on myoblasts in long-term cultivation of myoblast cell sheets. Sheets of myoblasts and mesenchymal cells from Japanese rabbit oral mucosa were generated and analyzed by histochemistry, Western blot, and reverse transcription-polymerase chain reaction. The presence of desmin and type IV collagen, which is seen in normal muscle tissue, was also confirmed in all the sheets produced. Expression of desmin and type IV collagen showed a decrease under co-culture conditions. In addition, expression of genes important in maintaining the undifferentiated state (Pax7, CD34, myogenin, MyoD) in myoblasts was observed throughout the long cultivation period. Insulin-like growth factor was expressed only when the mesenchymal cells were co-cultured with myoblasts. These data suggest that the presence of mesenchymal cells in a long-term co-culture system influences myoblast differentiation.
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