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• W2024570090 abstract "Prostaglandin metabolite 15-Deoxy-Δ12,14-prostaglandin J2 (15d-PGJ2) is known to inhibit a number of pro-inflammatory cytokines as well as being a ligand for nuclear receptor PPARγ. We investigated the ability of 15d-PGJ2 to inhibit TNF-α gene expression through mechanisms that involve histone modification. Pretreatment with 15d-PGJ2 (10 μM) inhibited LPS-stimulated TNF-α mRNA in THP-1 monocytes or PMA-differentiated cells to nearly basal levels. A specific PPARγ ligand, GW1929, failed to inhibit LPS-induced TNF-α mRNA expression nor did a PPARγ antagonist, GW9662, alter the repression of TNF-α mRNA in LPS-stimulated cells pretreated with 15d-PGJ2 suggesting a PPARγ-independent inhibition of TNF-α mRNA in THP-1 cells. Transfection studies with a reporter construct and subsequent treatment with 15d-PGJ2 demonstrated a dose-dependent inhibition of the TNF-α promoter. Additional studies demonstrated that inhibition of histone deacetylases with trichostatin A (TSA) or overexpression of histone acetyltransferase CBP could overcome 15d-PGJ2-mediated repression of the TNF-α promoter, suggesting that an important mechanism whereby 15d-PGJ2 suppresses a cytokine is through factors that regulate histone modifications. To examine the endogenous TNF-α promoter, chromatin immunoprecipitations (ChIP) were performed. ChIP assays demonstrated that LPS stimulation induced an increase in histone H3 and H4 acetylation at the TNF-α promoter, which was reduced in cells pretreated with 15d-PGJ2. These results highlight the ability of acetylation and deacetylation factors to affect the TNF-α promoter and demonstrate that an additional important mechanism whereby 15d-PGJ2 mediates TNF-α transcriptional repression by altering levels of acetylated histone H3 and H4 at its promoter." @default.
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• W2024570090 creator A5009886959 @default.
• W2024570090 creator A5024467260 @default.
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• W2024570090 date "2007-07-01" @default.
• W2024570090 modified "2023-09-26" @default.
• W2024570090 title "15-Deoxy-Δ12,14-prostaglandin J2 (15d-PGJ2) mediates repression of TNF-α by decreasing levels of acetylated histone H3 and H4 at its promoter" @default.
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• W2024570090 doi "https://doi.org/10.1016/j.bbrc.2007.05.057" @default.
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