Abstract
Various cytokines are thought to play a role in muscle regeneration, however, the interaction and mechanisms of action of these cytokines remains largely unknown. In this study, we investigated the role of HGF, IGF-I, and IGF-II during myogenesis using the regeneration model of skeletal muscle as well as myoblast culture. RT-PCR analysis revealed that HGF and IGF-I expressions were markedly upregulated, in regenerating muscle. In contrast, there was no significant difference in IGF-II expression between normal and regenerating muscle. Immunohistochemical analysis demonstrated that HGF was expressed mostly by myocytes during the early stages of muscle regeneration. Additionally, HGF inhibited the formation of myotubes by myoblasts, but promoted cellular proliferation. Otherwise, IGF-I and IGF-II were expressed by myocytes through the early to middle stages of muscle regeneration. The addition of HGF to myoblast growing in vitro significantly increased the number of cells. These findings indicate that these three cytokines have pleiotropic effects in regenerating skeletal muscle.
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Acknowledgements
We thank Dr. T. Sato and Mr. T. Nochi for technical assistance. This study was supported by a Research Project for Utilizing Advanced Technologies in Agriculture, Forestry and Fisheries (number 1523), Japan.
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Hayashi, S., Aso, H., Watanabe, K. et al. Sequence of IGF-I, IGF-II, and HGF expression in regenerating skeletal muscle. Histochem Cell Biol 122, 427–434 (2000). https://doi.org/10.1007/s00418-004-0704-y
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DOI: https://doi.org/10.1007/s00418-004-0704-y