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• W2890592215 endingPage "e13837" @default.
• W2890592215 startingPage "e13837" @default.
• W2890592215 abstract "The glucose transporter 4 (Glut4) mediates insulin-dependent glucose uptake. Glut4 expression levels are correlated with whole-body glucose homeostasis. Insulin signaling is known to recruit Glut4 to the cell surface. Expression of Glut4 is subject to tissue-specific hormonal and metabolic regulation. The molecular mechanisms regulating skeletal muscle Glut4 expression remain to be elucidated. Myostatin (Mstn) is reported to be involved in the regulation of energy metabolism. While elevated Mstn levels in muscle are associated with obesity and type-2 diabetes in both human and mouse models, Mstn null mice exhibit immunity to dietary-induced obesity and insulin resistance. The molecular mechanisms by which Mstn initiates the development of insulin resistance and disorders of glucose disposal are not well delineated. Here we investigated effects of Mstn on insulin action in C2C12 cells. Mstn significantly reduced basal and insulin-induced IRS-1 tyrosine (Tyr495) phosphorylation, and expression and activation of PI3K, associated with diminished AKT phosphorylation and elevated GSK3β phosphorylation at Ser9. In addition, Mstn inhibited Glut4 mRNA and protein expression, and reduced insulin-induced Glut4 membrane translocation and glucose uptake. Conversely, SB431542, a Smad2/3 inhibitor, significantly increased cellular response to insulin. Mstn decreased AMP-activated protein kinase (AMPK) activity accompanied by reduced Glut4 gene expression and glucose uptake, which were partially reversed by AICAR, an AMPK activator. These data suggest that Mstn inhibits Glut4 expression and insulin-induced Glut4 integration into cytoplasmic membranes and glucose uptake and that these changes are mediated by direct insulin-desensitizing effect and indirect suppression of AMPK activation." @default.
• W2890592215 created "2018-09-27" @default.
• W2890592215 creator A5022709890 @default.
• W2890592215 creator A5037935776 @default.
• W2890592215 creator A5080343219 @default.
• W2890592215 date "2018-09-01" @default.
• W2890592215 modified "2023-10-12" @default.
• W2890592215 title "Myostatin inhibits glucose uptake via suppression of insulin-dependent and -independent signaling pathways in myoblasts" @default.
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• W2890592215 doi "https://doi.org/10.14814/phy2.13837" @default.
• W2890592215 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6121119" @default.
• W2890592215 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30252210" @default.
• W2890592215 hasPublicationYear "2018" @default.
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