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- W1566642695 abstract "In response to inflammatory cytokines, chondrocytes and synovial fibroblasts produce high amounts of prostaglandins (PG) which self-perpetuate locally the inflammatory reaction. Prostaglandins act primarily through membrane receptors coupled to G proteins but also bind to nuclear Peroxisome Proliferator-Activated Receptors (PPARs). Amongst fatty acids, the cyclopentenone metabolite of PGD2, 15-deoxy-Delta12,14PGJ2 (15d-PGJ2), was shown to be a potent ligand of the PPARgamma isotype prone to inhibit the production of inflammatory mediators. As the stimulated synthesis of PGE2 originates from the preferential coupling of inducible enzymes, cyclooxygenase-2 (COX-2) and membrane PGE synthase-1 (mPGES-1), we investigated the potency of 15d-PGJ2 to regulate prostaglandins synthesis in rat chondrocytes stimulated with interleukin-1beta (IL-1beta). We demonstrated that 15d-PGJ2, but not the high-affinity PPARgamma ligand rosiglitazone, decreased almost completely PGE2 synthesis and mPGES-1 expression. The inhibitory potency of 15d-PGJ2 was unaffected by changes in PPARgamma expression and resulted from inhibition of NF-kappaB nuclear binding and IkappaBalpha sparing, secondary to reduced phosphorylation of IKKbeta. Consistently with 15d-PGJ2 being a putative endogenous regulator of the inflammatory reaction if synthesized in sufficient amounts, the present data confirm the variable PPARgamma-dependency of its effects in joint cells while underlining possible species and cell types specificities." @default.
- W1566642695 created "2016-06-24" @default.
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- W1566642695 date "2006-08-17" @default.
- W1566642695 modified "2023-09-30" @default.
- W1566642695 title "Effect of peroxisome proliferator activated receptor (PPAR)gamma agonists on prostaglandins cascade in joint cells." @default.
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- W1566642695 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16912428" @default.
- W1566642695 hasPublicationYear "2006" @default.
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