A negative regulatory pathway of GLUT4 trafficking in adipocyte: new function of RIP140 in the cytoplasm via AS160.

A negative regulatory pathway of GLUT4 trafficking in adipocyte: new function of RIP140 in the cytoplasm via AS160.
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DOI:
10.1016/j.cmet.2009.09.012
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发表时间:
2009-12
期刊:
影响因子:
29
通讯作者:
Wei LN
Wei LN
中科院分区:
生物学1区
文献类型:
--
作者:
Ho PC;Lin YW;Tsui YC;Gupta P;Wei LN

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受体相互作用蛋白140 (RIP140)是一种核受体协同抑制因子,在脂质和葡萄糖代谢中起重要作用。在脂肪细胞中,RIP140可以被蛋白激酶Cε (PKCε)磷酸化,然后是精氨酸甲基化,并输出到细胞质。这项研究首次证明了RIP140的细胞质功能:对抗胰岛素刺激的葡萄糖转运蛋白4 (GLUT4)膜分配和脂肪细胞中的葡萄糖摄取。细胞质RIP140与Akt底物AS160相互作用,从而阻碍Akt对AS160的磷酸化;这反过来又减少了GLUT4的贩运。这种信号转导途径可以在饮食诱导肥胖小鼠的附睾脂肪细胞中得到概括:核PKCε被激活,细胞质RIP140增加,GLUT4运输和葡萄糖摄取减少。这些数据揭示了RIP140作为GLUT4运输和葡萄糖摄取的负调节因子的一种新的细胞质功能,并揭示了核启动抵消机制对基础和胰岛素刺激的葡萄糖处理的调节。
Receptor Interacting Protein 140 (RIP140), a nuclear receptor corepressor, is important for lipid and glucose metabolism. In adipocytes, RIP140 can be phosphorylated by protein kinase C epsilon (PKCε), followed by arginine methylation, and exported to the cytoplasm. This study demonstrates for the first time a cytoplasmic function for RIP140: to counteract insulin-stimulated glucose transporter 4 (GLUT4) membrane partitioning and glucose uptake in adipocytes. Cytoplasmic RIP140 interacts with the Akt substrate AS160, thereby impeding AS160 phosphorylation by Akt; this in turn reduces GLUT4 trafficking. This signal transduction pathway can be recapitulated in the epididymal adipocytes of diet-induced obese mice: nuclear PKCε is activated, cytoplasmic RIP140 increases, and GLUT4 trafficking and glucose uptake are reduced. The data reveal a new, cytoplasmic, function for RIP140 as a negative regulator of GLUT4 trafficking and glucose uptake, and shed insight into the regulation of basal and insulin-stimulated glucose disposal by a nuclear-initiated counteracting mechanism.
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