PMID: 9539737May 16, 1998Paper

ADD1/SREBP1 activates PPARgamma through the production of endogenous ligand

Proceedings of the National Academy of Sciences of the United States of America
J B KimB M Spiegelman

Abstract

Adipose differentiation is an important part of the energy homeostasis system of higher organisms. Recent data have suggested that this process is controlled by an interplay of transcription factors including PPARgamma, the C/EBPs, and ADD1/SREBP1. Although these factors interact functionally to initiate the program of differentiation, there are no data concerning specific mechanisms of interaction. We show here that the expression of ADD1/SREBP1 specifically increases the activity of PPARgamma but not other isoforms, PPARalpha, or PPARdelta. This activation occurs through the ligand-binding domain of PPARgamma when it is fused to the DNA-binding domain of Gal4. The stimulation of PPARgamma by ADD1/SREBP1 does not require coexpression in the same cells; supernatants from cultures that express ADD1/SREBP1 augment the transcriptional activity of PPARgamma. Finally, we demonstrate directly that cells expressing ADD1/SREBP1 produce and secrete lipid molecule(s) that bind directly to PPARgamma, displacing the binding of radioactive thiazolidinedione ligands. These data establish that ADD1/SREBP1 can control the production of endogenous ligand(s) for PPARgamma and suggest a mechanism for coordinating the actions of these adipogenic f...Continue Reading

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Citations

Mar 1, 2000·British Journal of Pharmacology·D Bishop-Bailey
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Jan 23, 2015·In Vitro Cellular & Developmental Biology. Animal·Yingjun CuiQingzhang Li

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