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• W2003105318 endingPage "231" @default.
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• W2003105318 abstract "Objective The cluster of differentiation-1d (CD1d) recognizes and presents the lipid antigens to NK-T lymphocytes. Atherosclerotic lesions contain atherogenic lipids, mainly cholesterol and its oxides. Peroxisome proliferator-activated receptor-γ (PPARγ) is also known to exist in atherosclerotic lesions, participating in regulation of lipid metabolism. The current study tested whether CD1d acts as a surface receptor that mediates induction and activation of PPARγ by oxysterols commonly found in atherosclerotic lesions. Methods and results CD1d overexpression in HEK 293 cells transfected with CD1d cDNA was confirmed by fluorescence, flow cytometry, Western blotting and mRNA expression. Tritiated (3H) 7-ketocholesterol (7K) was used for lipid binding assays. Radioactive assessment demonstrated an increased 7K-binding activity HEK 293 cells with CD1d overexpression. The 7K binding could be blocked by another oxysterol, 25-hydroxycholesterol, but not by native free cholesterol. Addition of CD1d:IgG dimer protein or an anti-CD1d antibody, but not control IgG, significantly diminished 7K binding to CD1d-expressing HEK 293 cells. CD1d deficiency markedly diminished the 7K-binding in macrophages and smooth muscle cells. Western blot and gel shift assays demonstrated that CD1d-mediated 7K binding induced expression and activation of PPARγ. The PPARγ agonist PGJ2 enhances the 7K stimulatory effect on PPARγ expression and activity but the antagonist GW9662 inhibits the 7K effect on the CD1d-expressing cells. Conclusions CD1d acts as a cell surface receptor that recognizes and binds oxysterols and initializes a pathway connecting oxysterol binding to PPARγ activation." @default.
• W2003105318 created "2016-06-24" @default.
• W2003105318 creator A5029949545 @default.
• W2003105318 creator A5038346349 @default.
• W2003105318 creator A5080155540 @default.
• W2003105318 date "2015-03-01" @default.
• W2003105318 modified "2023-10-12" @default.
• W2003105318 title "CD1d serves as a surface receptor for oxidized cholesterol induction of peroxisome proliferator-activated receptor-γ" @default.
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• W2003105318 doi "https://doi.org/10.1016/j.atherosclerosis.2015.01.004" @default.
• W2003105318 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25618030" @default.
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