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- W2023459898 abstract "Natural and synthetic agonists of the peroxisome proliferator-activated receptor gamma (PPARgamma) regulate adipocyte differentiation, glucose homeostasis, and inflammatory responses. Although effects on adipogenesis and glucose metabolism are genetically linked to PPARgamma, the PPARgamma dependence of antiinflammatory responses of these substances is less clear. Here, we have used a combination of mRNA expression profiling and conditional disruption of the PPARgamma gene in mice to characterize programs of transcriptional activation and repression by PPARgamma agonists in elicited peritoneal macrophages. Natural and synthetic PPARgamma agonists, including the thiazolidinedione rosiglitazone (Ro), modestly induced the expression of a surprisingly small number of genes, several of which were also induced by a specific PPARdelta agonist. The majority of these genes encode proteins involved in lipid homeostasis. In contrast, Ro inhibited induction of broad subsets of lipopolysaccharide and IFN-gamma target genes in a gene-specific and PPARgamma-dependent manner. At high concentrations, Ro inhibited induction of lipopolysaccharide target genes in PPARgamma-deficient macrophages, at least in part by activating PPARdelta. These studies establish overlapping transactivation and transrepression functions of PPARgamma and PPARdelta in macrophages and suggest that a major transcriptional role of PPARgamma is negative regulation of specific subsets of genes that are activated by T helper 1 cytokines and pathogenic molecules that signal through pattern recognition receptors. These findings support a physiological role of PPARgamma in regulating both native and acquired immune responses." @default.
- W2023459898 created "2016-06-24" @default.
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- W2023459898 date "2003-05-09" @default.
- W2023459898 modified "2023-10-14" @default.
- W2023459898 title "PPARγ and PPARδ negatively regulate specific subsets of lipopolysaccharide and IFN-γ target genes in macrophages" @default.
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- W2023459898 doi "https://doi.org/10.1073/pnas.1031789100" @default.
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