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- W2123340319 abstract "Objective— 15-Deoxy-Δ 12,14 -prostaglandin J 2 (15d-PGJ2), a natural ligand of the peroxisome proliferator–activated receptor-γ (PPARγ), has been shown to inhibit proinflammatory gene expression, but the signaling mechanisms involved remain unclear. Because retinoic acid receptor–related orphan receptor-α (RORα) has been reported to suppress tumor necrosis factor-α (TNF-α)–induced expression of proinflammatory genes, we hypothesized that 15d-PGJ2 may induce RORα expression resulting in inhibition of proinflammatory gene expression. Methods and Results— We demonstrate that 15d-PGJ2 induced RORα1 and RORα4 expression and inhibited TNF-α–induced vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) expression in human umbilical vein endothelial cells (HUVECs). In contrast, the synthetic PPARγ ligand pioglitazone weakly induced RORα4 expression but did not affect RORα1 expression or TNF-α–induced gene expression. Biphenol A diglycidyl ether, a PPARγ antagonist, did not block the effect of 15d-PGJ2 on RORα expression. Adenovirus-mediated overexpression of RORα1 inhibited TNF-α–induced VCAM-1 and ICAM-1 expression, and overexpression of a mutant form of RORα1 (RORα1Δ), which inhibited transcriptional activity of RORα1 and RORα4, attenuated its inhibition. Furthermore, we found that RORα1Δ attenuated the inhibitory actions of 15d-PGJ2 on TNF-α–induced VCAM-1 and ICAM-1 expression. Conclusions— These results suggest that 15d-PGJ2 inhibits TNF-α–induced expression of proinflammatory genes mediated in part via induction of RORα in HUVECs. This mechanism provides a novel insight into PPARγ-independent actions of 15d-PGJ2." @default.
- W2123340319 created "2016-06-24" @default.
- W2123340319 creator A5018985536 @default.
- W2123340319 creator A5031161165 @default.
- W2123340319 date "2005-04-01" @default.
- W2123340319 modified "2023-09-25" @default.
- W2123340319 title "15-Deoxy-Δ12,14-Prostaglandin J2(15d-PGJ2) Signals Through Retinoic Acid Receptor–Related Orphan Receptor-α but Not Peroxisome Proliferator–Activated Receptor-γ in Human Vascular Endothelial Cells" @default.
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- W2123340319 doi "https://doi.org/10.1161/01.atv.0000156482.76228.d1" @default.
- W2123340319 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15662020" @default.
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