Ho_2011_Cell.Signal_23_1396

Reference

Title : Cytoplasmic receptor-interacting protein 140 (RIP140) interacts with perilipin to regulate lipolysis - Ho_2011_Cell.Signal_23_1396
Author(s) : Ho PC , Chuang YS , Hung CH , Wei LN
Ref : Cell Signal , 23 :1396 , 2011
Abstract :

Receptor-interacting protein 140 (RIP140) is abundantly expressed in mature adipocyte and modulates gene expression involved in lipid and glucose metabolism. Protein kinase C epsilon and protein arginine methyltransferase 1 can sequentially stimulate RIP140 phosphorylation and then methylation, thereby promoting its export to the cytoplasm. Here we report a lipid signal triggering cytoplasmic accumulation of RIP140, and a new functional role for cytoplasmic RIP140 in adipocyte to regulate lipolysis. Increased lipid content, particularly an elevation in diacylglycerol levels, promotes RIP140 cytoplasmic accumulation and increased association with lipid droplets (LDs) by its direct interaction with perilipin. By interacting with RIP140, perilipin more efficiently recruits hormone-sensitive lipase (HSL) to LDs and enhances adipose triglyceride lipase (ATGL) forming complex with CGI-58, an activator of ATGL. Consequentially, HSL can more readily access its substrates, and ATGL is activated, ultimately enhancing lipolysis. In adipocytes, blocking cytoplasmic RIP140 accumulation reduces basal and isoproterenol-stimulated lipolysis and the pro-inflammatory potential of their conditioned media (i.e. activating NF-kappaB and inflammatory genes in macrophages). These results show that in adipocytes with high lipid contents, RIP140 increasingly accumulates in the cytoplasm and enhances triglyceride catabolism by directly interacting with perilipin. The study suggests that reducing nuclear export of RIP140 might be a useful means of controlling adipocyte lipolysis.

PubMedSearch : Ho_2011_Cell.Signal_23_1396
PubMedID: 21504789

Related information

Citations formats

Ho PC, Chuang YS, Hung CH, Wei LN (2011)
Cytoplasmic receptor-interacting protein 140 (RIP140) interacts with perilipin to regulate lipolysis
Cell Signal 23 :1396

Ho PC, Chuang YS, Hung CH, Wei LN (2011)
Cell Signal 23 :1396