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
中科院分区:
文献类型:
--
作者:
Ho PC;Lin YW;Tsui YC;Gupta P;Wei LN
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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