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- W2166603326 abstract "Insulin regulates the uptake of glucose into skeletal muscle and adipocytes by redistributing the tissue-specific glucose transporter GLUT4 from intracellular vesicles to the cell surface. To date, GLUT4 is the only protein involved in insulin-regulated vesicular traffic that has this tissue distribution, thus raising the possibility that its expression alone may allow formation of an insulin-responsive vesicular compartment. We show here that treatment of differentiating C2C12 myoblasts with dexamethasone, acting via the glucocorticoid receptor, causes a >or=10-fold increase in GLUT4 expression but results in no significant change in insulin-stimulated glucose transport. Signaling from the insulin receptor to its target, Akt2, and expression of the soluble N-ethylmaleimide-sensitive factor-attachment protein receptor, or SNARE, proteins syntaxin 4 and vesicle-associated membrane protein are normal in dexamethasone-treated C2C12 cells. However, these cells show no insulin-dependent trafficking of the insulin-responsive aminopeptidase or the transferrin receptor, respective markers for intracellular GLUT4-rich compartments and endosomes that are insulin responsive in mature muscle and adipose cells. Therefore, these data support the hypothesis that GLUT4 expression by itself is insufficient to establish an insulin-sensitive vesicular compartment." @default.
- W2166603326 created "2016-06-24" @default.
- W2166603326 creator A5050956643 @default.
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- W2166603326 date "2002-09-01" @default.
- W2166603326 modified "2023-09-23" @default.
- W2166603326 title "C<sub>2</sub>C<sub>12</sub>myocytes lack an insulin-responsive vesicular compartment despite dexamethasone-induced GLUT4 expression" @default.
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- W2166603326 doi "https://doi.org/10.1152/ajpendo.00092.2002" @default.
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