title: Prostaglandin E2 synthesis in human monocyte-derived dendritic cells.
abstract: Prostaglandin E2 (PGE2), which is generated by the enzymatic activity of cyclooxygenase-1 and -2 (COX-1/2), plays a central role in the maturation process of dendritic cells (DC). Since regulation of COX-1/2 expression in human DC is only partially understood, we addressed the expression and activity of COX-1/2 in these cells. Here we show that lipopolysaccharide (lps) induces COX-2 mRNA and protein synthesis as well as the release of PGE2 in human interleukin-4 and granulocyte/macrophage colony-stimulating factor-differentiated monocyte-derived DC cultivated in the presence of 1% human plasma. Moreover, we found that lps induces p38 stress-activated protein kinase (p38) in these cells and inhibitors of p38 blocked lps-induced COX-2 expression and activity. Our data indicate that during lps-induced maturation p38 regulates COX-2 expression and PGE2 synthesis in DC.
authors.affiliation: Department of Experimental Dermatology, University of Freiburg, D-79104 Freiburg, Germany. norgauer@haut.ukl.uni-freiburg.de
authors.forename: Johannes
authors.initials: J
authors.lastname: Norgauer
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Ibig
authors.forename: Doris
authors.initials: D
authors.lastname: Gmeiner
authors.forename: Yared
authors.initials: Y
authors.lastname: Herouy
authors.forename: Bernd L
authors.initials: BL
authors.lastname: Fiebich
mesh_terms: D002454:Cell Differentiation / Q000502:physiology*; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D003713:Dendritic Cells / Q000378:metabolism*; D015232:Dinoprostone / Q000096:biosynthesis*; D006801:Humans; D007527:Isoenzymes / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D008074:Lipoproteins / Q000378:metabolism; D008565:Membrane Proteins; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors; D009000:Monocytes / Q000378:metabolism; D011451:Prostaglandin-Endoperoxide Synthases / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases
chemical_list: D007527:Isoenzymes; D008074:Lipoproteins; D008565:Membrane Proteins; D012333:RNA, Messenger; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C496511:PTGS1 protein, human; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D015232:Dinoprostone