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Interleukin-6 promotes 2-deoxyglucose uptake through p44/42 MAPKs activation via Ca2+/PKC and EGF receptor in primary cultured chicken hepatocytes.

J. Cell. Physiol.2009 Mar;218(3):643-52. doi:10.1002/jcp.21641
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摘要


Interleukin-6 (IL-6) is involved in a variety of biological responses, including the glucose metabolism and cell growth, which is a critical physiological function requiring multiple metabolic pathways. Therefore, in the present study, we examined the effect of IL-6 on 2-deoxyglucose (2-DG) uptake and the related signaling pathways in primary cultured chicken hepatocytes. IL-6 increased 2-DG uptake in a time- (> or =4 h) and a dose -(> or =5 ng/ml) dependent manner. Indeed, IL-6 increased GLUT-2 mRNA and protein expression as well as 2-DG uptake, which were blocked by actinomycin D (AD, transcription inhibitor) and cycloheximide (CHX, translation inhibitor). IL-6 (10 ng/ml) increased the level of IL-6Ralpha and glycoprotein (gp) 130 (IL-6Rbeta) protein expressions. IL-6 increased Janus Kinase (JAK)-2, signal transducer and activator of transcription phosphorylation, intracellular Ca(2+) concentration, and phosphorylation. IL-6-induced increase of 2-DG uptake and GLUT-2 protein expression were blocked by JAK2-specific siRNA, a inhibitor, staurosporine, and bisindolylmaleimide I inhibitors). In addition, IL-6 increased EGFR/src/FAK, PI3K/Akt phosphorylation and 2-DG uptake as well as GLUT-2 protein expression, which were blocked by AG 1478 (EGF receptor inhibitor), PP2 (src family of tyrosine kinase inhibitor), PI3K-specific siRNA, and a Akt inhibitor. Furthermore, IL-6 increased p44/42 MAPKs phosphorylation and p44 and p42 MAPK-specific siRNA mixture blocked IL-6-induced increase of 2-DG uptake and GLUT-2 protein expression. In conclusion, IL-6 stimulates the 2-DG uptake through p44/42 MAPKs activation via and EGF receptor in primary cultured chicken hepatocytes.

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