PexRAP Inhibits PRDM16-Mediated Thermogenic Gene Expression.

ABSTRACT: How the nuclear receptor PPAR? regulates the development of two functionally distinct types of adipose tissue, brown and white fat, as well as the browning of white fat, remains unclear. Our previous studies suggest that PexRAP, a peroxisomal lipid synthetic enzyme, regulates PPAR? signaling and white adipogenesis. Here, we show that PexRAP is an inhibitor of brown adipocyte gene expression. PexRAP inactivation promoted adipocyte browning, increased energy expenditure, and decreased adiposity. Identification of PexRAP-interacting proteins suggests that PexRAP function extends beyond its role as a lipid synthetic enzyme. Notably, PexRAP interacts with importin-?1, a nuclear import factor, and knockdown of PexRAP in adipocytes reduced the levels of nuclear phospholipids. PexRAP also interacts with PPAR?, as well as PRDM16, a critical transcriptional regulator of thermogenesis, and disrupts the PRDM16-PPAR? complex, providing a potential mechanism for PexRAP-mediated inhibition of adipocyte browning. These results identify PexRAP as an important regulator of adipose tissue remodeling.

SUBMITTER: Lodhi IJ 

PROVIDER: S-EPMC5679740 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature