期刊
INTERNATIONAL JOURNAL OF BIOCHEMISTRY & CELL BIOLOGY
卷 42, 期 12, 页码 2072-2081出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biocel.2010.09.017
关键词
Myostatin; Glucose; Glycolysis; Metabolism; AMPK
资金
- National Basic Research Program of China [2005CB522405, 2005CB522505, 2007CB946903, 2009CB825403]
- National Natural Science Foundation of China [30721063]
- Chinese National Programs for High Technology Research and Development [2006AA10A121, 2007AA02Z109]
myostatin (Mstn) is a secreted growth factor predominately expressed in skeletal muscle that negatively regulates skeletal muscle mass. Recent studies have indicated that loss function of myostatin not only increases muscle mass but also improves insulin sensitivity in vivo. In the present report, we demonstrated that myostatin regulates glucose metabolism by promoting glucose consumption and glucose uptake, increasing glycolysis, and inhibiting glycogen synthesis in skeletal muscle cells. Microarray analysis revealed that myostatin upregulates several genes involved in regulating glucose metabolism such as Glut1, Glut4, Hk2, and IL-6. Further investigation of the molecular basis of these phenomena revealed that AMP-activated protein kinase (AMPK), a key component for maintaining energy homeostasis, was activated by myostatin for promotion of glycolysis. Taken together, these findings provide the first experimental evidence that myostatin regulates glucose metabolism through the AMPK signal pathway in muscle cells. Importantly, our findings highlight that continued investigation of the metabolic function of myostatin is necessary for a comprehensive understanding of its active role in the regulation of skeletal muscle energy metabolism. (C) 2010 Elsevier Ltd. All rights reserved.
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