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1α,25(OH)2D3 downregulates gene expression levels of muscle ubiquitin ligases MAFbx and MuRF1 in human myotubes

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タイトル: 1α,25(OH)2D3 downregulates gene expression levels of muscle ubiquitin ligases MAFbx and MuRF1 in human myotubes
著者: Hayakawa, Naohiko 著作を一覧する
Fukumura, Junko 著作を一覧する
Yasuno, Hideyuki 著作を一覧する
Fujimoto-Ouchi, Kaori 著作を一覧する
Kitamura, Hidemitsu 著作を一覧する
発行日: 2015年 4月
出版者: Biomedical Research Press
誌名: Biomedical Research
巻: 36
号: 2
開始ページ: 71
終了ページ: 80
出版社 DOI: 10.2220/biomedres.36.71
抄録: Clinical trials involving in patients with osteoporosis have reported that activated vitamin D3 (1α,25(OH)2D3, calcitriol) can prevent falling by acting on the skeletal muscles. However, pharmacological mechanisms of 1α,25(OH)2D3 with respect to skeletal muscle hypertrophy or atrophy are still poorly understood. Therefore, we examined changes in the expression of several related genes in human myotubes to test whether 1α,25(OH)2D3 influences hypertrophy and atrophy of skeletal muscle. Myotubes treated with 1α,25(OH)2D3 increased interleukin-6 (IL-6) expression and inhibited expression of tumor necrosis factor alpha (TNF-α), whereas the expression of insulin-like growth factor-1 (IGF-1) that is involved in muscle hypertrophy was not affected. However, 1α,25(OH)2D3 treatment significantly inhibited the expression of muscle atrophy F-box (MAFbx) and muscle RING finger 1 (MuRF1), ubiquitin ligases involved in muscle atrophy. The analysis of pathways using microarray data suggested that 1α,25(OH)2D3 upregulates AKT-1 by inhibiting the expression of protein phosphatase 2 (PP2A), a phosphatase acting on AKT-1, in the phosphatidylinositol 3-kinase (PI3K)/AKT signaling pathway, thereby inhibiting the expression of ubiquitin ligases. Thus, this study showed that 1α,25(OH)2D3 might have an inhibitory effect on the expression of MAFbx and MuRF1 in skeletal muscle and a suppressive effect on muscle degradation in patients with osteoporosis.
資料タイプ: article
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 北村 秀光


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