Transcriptional coactivator PRIP, the peroxisome proliferator-activated receptor gamma (PPARgamma)-interacting protein, is required for PPARgamma-mediated adipogenesis

The Journal of Biological Chemistry
C QiJanardan K Reddy

Abstract

Nuclear receptor coactivator PRIP (peroxisome proliferators-activated receptor (PPARgamma)-interacting protein) appears to serve as a linker between cAMP response element-binding protein-binding protein (CBP/p300)anchored and PBP (PPARgamma-binding protein)-anchored coactivator complexes involved in the transcriptional activity of nuclear receptors. Disruption of PRIP and PBP genes results in embryonic lethality between embryonic day 11.5 and 12.5 (postcoitum), indicating that PRIP and PBP are essential and nonredundant coactivators. Both PRIP and PBP were initially identified as PPARgamma coactivators, suggesting a role for these molecules in PPARgamma-induced adipogenesis. PBP-/- mouse embryonic fibroblasts fail to exhibit PPARgamma-stimulated adipogenesis indicating that PBP is a downstream regulator of PPARgamma-mediated adipogenesis. We now show that PRIP-/- mouse embryonic fibroblasts are also refractory to PPARgamma-stimulated adipogenesis and fail to express adipogenic marker aP2, a PPARgamma-responsive gene. Chromatin immunoprecipitation assays reveal reduced association in PRIP-/- cells of PIMT (PRIP-binding protein) and PBP with aP2 gene promoter, suggesting that PRIP is required for the linking of CBP/p300-anchored ...Continue Reading

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