Muscle type difference in the regulation of UCP3 under cold conditions |
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Authors: | Wang Zuocheng Kontani Yasuhide Sato Yuzo Mizuno Takafumi Mori Nozomu Yamashita Hitoshi |
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Institution: | Department of Molecular Genetics, National Institute for Longevity Sciences, 36-3 Gengo, Morioka-cho, Obu-shi, Aichi-ken 474-8522, Japan. |
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Abstract: | We found opposite regulation of uncoupling protein 3 (UCP3) in slow-twitch soleus and fast-twitch gastrocnemius muscles of rats during cold exposure. Namely, the UCP3 mRNA level was downregulated in the soleus muscles, but upregulated in the gastrocnemius muscles after a 24-h cold exposure. In the analysis of UCP3 protein, we first succeeded in detecting UCP3 short-form as well as the long-form in vivo, which levels were decreased markedly in the cold-exposed soleus muscles. However, the levels of UCP3 and cytochrome oxidase subunit IV were well maintained in the cold-exposed gastrocnemius muscles with a rise in the total mitochondrial protein level, suggesting an increase of total oxidative ability. The fast-twitch muscle rather than the slow-twitch one may play an important role in adaptive responses, including thermogenesis under acute cold exposure. |
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Keywords: | Uncoupling protein 3 Skeletal muscles Thermoregulation Cold exposure |
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