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Journal Article
Research Support, N.I.H., Extramural
Research Support, U.S. Gov't, Non-P.H.S.
Sterol Regulatory Element Binding Protein Regulates the Expression and Metabolic Functions of Wild-Type and Oncogenic IDH1.
Molecular and Cellular Biology 2016 September 16
Sterol regulatory element binding protein (SREBP) is a major transcriptional regulator of the enzymes underlying de novo lipid synthesis. However, little is known about the SREBP-mediated control of processes that indirectly support lipogenesis, for instance, by supplying reducing power in the form of NAPDH or directing carbon flux into lipid precursors. Here, we characterize isocitrate dehydrogenase 1 (IDH1) as a transcriptional target of SREBP across a spectrum of cancer cell lines and human cancers. IDH1 promotes the synthesis of lipids specifically from glutamine-derived carbons. Neomorphic mutations in IDH1 occur frequently in certain cancers, leading to the production of the oncometabolite 2-hydroxyglutarate (2-HG). We found that SREBP induces the expression of oncogenic IDH1 and influences 2-HG production from glucose. Treatment of cells with 25-hydroxycholesterol or statins, which respectively inhibit or activate SREBP, further supports SREBP-mediated regulation of IDH1 and, in cells with oncogenic IDH1, carbon flux into 2-HG.
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