title: Inhibition of IL-6, TNF-alpha, and cyclooxygenase-2 protein expression by prostaglandin E2-induced IL-10 in bone marrow-derived dendritic cells.
abstract: Several endogenously produced mediators, including cytokines such as IL-6, IL-10, and TNF-alpha and prostanoids such as prostaglandin E(2) (PGE(2)), regulate dendritic cell (DC) function and contribute to immune homeostasis. In this study, we report that exogenous PGE(2) enhances the production of IL-10 from bone marrow-derived DC (BM-DC). IL-6, but not TNF-alpha, release is enhanced by PGE(2) in the presence of anti-IL-10, suggesting that endogenous IL-10 masks PGE(2)-induced IL-6. Furthermore, both exogenous IL-10 and PGE(2) inhibit LPS-induced IL-6 and TNF-alpha, whereas selective inhibition of cyclooxygenase-2 (COX-2) or addition of anti-IL-10 causes the reverse effects. Exogenous IL-10, but not IL-6, dose-dependently suppresses COX-2 protein expression and PGE(2) production, and TNF-alpha does not reverse this effect. In contrast, anti-IL-10 up-regulates prostanoid production by LPS-stimulated BM-DC. Taken together, our results show that in response to PGE(2), BM-DC produce IL-10, which in turn down-regulates their own production of IL-6-, TNF-alpha-, and COX-2-derived prostanoids, and plays crucial roles in determining the BM-DC pro-inflammatory phenotype.
authors.affiliation: CNRS UMR 5540, University Bordeaux 2, Bordeaux, France. harizihedi33@yahoo.fr
authors.forename: Hedi
authors.initials: H
authors.lastname: Harizi
authors.forename: Gualde
authors.initials: G
authors.lastname: Norbert
authors.forename: Harizi
authors.initials: H
authors.lastname: Hedi
mesh_terms: D000818:Animals; D015153:Blotting, Western; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology; D003713:Dendritic Cells / Q000187:drug effects / Q000201:enzymology / Q000276:immunology / Q000378:metabolism*; D015232:Dinoprostone / Q000494:pharmacology*; D005260:Female; D005434:Flow Cytometry; D016753:Interleukin-10 / Q000096:biosynthesis* / Q000276:immunology; D015850:Interleukin-6 / Q000096:biosynthesis / Q000276:immunology*; D007527:Isoenzymes / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000276:immunology; D007975:Leukotriene B4 / Q000037:antagonists & inhibitors / Q000276:immunology; D008070:Lipopolysaccharides / Q000037:antagonists & inhibitors / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D009578:Nitrobenzenes / Q000494:pharmacology; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis / Q000276:immunology; D011720:Pyrazoles / Q000494:pharmacology; D013449:Sulfonamides / Q000494:pharmacology; D013929:Thromboxane B2 / Q000037:antagonists & inhibitors / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000276:immunology; D000093242:Interleukin-6 Inhibitors
chemical_list: D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D015232:Dinoprostone; D016753:Interleukin-10; D015850:Interleukin-6; D007527:Isoenzymes; D007975:Leukotriene B4; D008070:Lipopolysaccharides; D009578:Nitrobenzenes; D011451:Prostaglandin-Endoperoxide Synthases; D011720:Pyrazoles; D013449:Sulfonamides; D013929:Thromboxane B2; D014409:Tumor Necrosis Factor-alpha; D000093242:Interleukin-6 Inhibitors; C115461:SC 560; C080955:N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide