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• W2091466360 abstract "Lysophosphatidic acid (LPA) is a pluripotent lipid mediator acting through plasma membrane-associated LPA(x) receptors that transduce many, but not all, of its effects. We identify peroxisome proliferator-activated receptor gamma (PPARgamma) as an intracellular receptor for LPA. The transcription factor PPARgamma is activated by several lipid ligands, but agonists derived from physiologic signaling pathways are unknown. We show that LPA, but not its precursor phosphatidic acid, displaces the drug rosiglitazone from the ligand-binding pocket of PPARgamma. LPA and novel LPA analogs we made stimulated expression of a PPAR-responsive element reporter and the endogenous PPARgamma-controlled gene CD36, and induced monocyte lipid accumulation from oxidized low-density lipoprotein via the CD36 scavenger receptor. The synthetic LPA analogs were effective PPARgamma agonists, but were poor ones for LPA(1), LPA(2), or LPA(3) receptor transfected cells. Transfection studies in yeast, which lack nuclear hormone and LPA(x) receptors, show that LPA directly activates PPARgamma. A major growth factor of serum is LPA generated by thrombin-activated platelets, and media from activated platelets stimulated PPARgamma function in transfected RAW264.7 macrophages. This function was suppressed by ectopic LPA-acyltransferase expression. LPA is a physiologic PPARgamma ligand, placing PPARgamma in a signaling pathway, and PPARgamma is the first intracellular receptor identified for LPA. Moreover, LPA produced by stimulated plasma platelets activates PPARgamma in nucleated cells." @default.
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• W2091466360 date "2002-12-26" @default.
• W2091466360 modified "2023-10-16" @default.
• W2091466360 title "Identification of an intracellular receptor for lysophosphatidic acid (LPA): LPA is a transcellular PPARγ agonist" @default.
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• W2091466360 doi "https://doi.org/10.1073/pnas.0135855100" @default.
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