title: Involvement of p38 mitogen-activated protein kinase in PLL-AGE-induced cyclooxgenase-2 expression.
abstract: In the present study, murine RAW 264.7 macrophages were incubated with poly-L-lysine-derived advanced glycosylation end products (PLL-AGEs) to examine cyclooxygenase-2 protein expression. Treatment of RAW 264.7 cells with PLL-AGEs caused the dose-dependent expression of cylooxygenase-2 but not cylooxygenase-1 and an increase in cylooxygenase activity. Increased cylooxygenase-2 expression was seen at 6 h and reached a maximum at 24 h. The tyrosine kinase inhibitor, genistein, and the p38 mitogen-activated protein kinase (MAPK) inhibitor, [4-(4-fluorophenyl)-2-(4-methylsulfinylphenyl)-5-(4-pyridyl)1H-imidazole] (SB 203580), inhibited PLL-AGE-induced cylooxygenase-2 expression, while the Ras inhibitor, FPT inhibitor II, and the MAP kinase kinase inhibitor, (2'-amino-3'-methoxyflavone) (PD 98059), had no effect on PLL-AGE-induced cylooxygenase-2 expression. Incubation of RAW 264.7 cells with PLL-AGEs resulted in activation of p38 MAPK, and this activation was suppressed by genistein and SB 203580. Taken together, our results suggest that activation of protein tyrosine kinase and p38 MAPK is involved in AGE-induced cyclooxygenase-2 expression in RAW 264.7 macrophages.
authors.affiliation: Graduate Institute of Biomedical Technology and School of Medical Technology, 250, Wu-Hsing Street, 110, Taipei, Taiwan.
authors.forename: Chien-Huang
authors.initials: CH
authors.lastname: Lin
authors.forename: Chih-Hsiung
authors.initials: CH
authors.lastname: Wu
authors.forename: Wai-Yee
authors.initials: WY
authors.lastname: Thum
authors.forename: Yuan-Sun
authors.initials: YS
authors.lastname: Ho
authors.forename: Horng-Mo
authors.initials: HM
authors.lastname: Lee
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D000818:Animals; D019328:Buthionine Sulfoximine / Q000494:pharmacology; D002460:Cell Line; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects; D019833:Genistein / Q000494:pharmacology; D017127:Glycation End Products, Advanced / Q000378:metabolism / Q000494:pharmacology*; D007093:Imidazoles / Q000494:pharmacology; D007527:Isoenzymes / Q000096:biosynthesis / Q000187:drug effects* / Q000378:metabolism; D008070:Lipopolysaccharides / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D019001:Nitric Oxide Synthase / Q000187:drug effects / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II; D011107:Polylysine / Q000378:metabolism; D011112:Polymyxin B / Q000494:pharmacology; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis / Q000187:drug effects* / Q000378:metabolism; D011725:Pyridines / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases
chemical_list: D017127:Glycation End Products, Advanced; D007093:Imidazoles; D007527:Isoenzymes; D008070:Lipopolysaccharides; D011725:Pyridines; D017382:Reactive Oxygen Species; D011107:Polylysine; D019328:Buthionine Sulfoximine; D019833:Genistein; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D011451:Prostaglandin-Endoperoxide Synthases; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D011112:Polymyxin B; C093642:SB 203580; D019331:NG-Nitroarginine Methyl Ester; D000111:Acetylcysteine