title: Suppression of phosphorylation of extracellular-signal-regulated kinase and p38 mitogen-activated protein kinase in polymorphonuclear leukocytes by the proton pump inhibitor lansoprazole.
abstract: Lansoprazole (LPZ) is a proton pump inhibitor that suppresses gastric secretion and exerts anti-inflammatory effects on immune cells. Recently, LPZ has been used for the treatment of peptic ulcer and gastritis, which can be caused by Helicobacter pylori, due to its potent acid-suppressive effects. We focused the aim to the anti-inflammatory effects on the over-activation of neutrophils, and investigated the effects of LPZ on the signal transduction of the mitogen-activated protein kinase (MAPK) family. LPZ slightly phosphorylated p38 MAPK of neutrophils at a concentration of 10 microg/ml , but did not phosphorylate extracellular-signal regulated kinase (ERK) 1/2. Pretreatment of neutrophils with (1-5 microg/ml ) LPZ strongly attenuated the phorbol-12-myristate-13-acetate-stimulated phosphorylation of ERK1/2, and LPZ slightly suppressed the lipopolysaccharide (LPS)- and N-formylmethionylleucylphenylalanine-stimulated phosphorylation of p38. ERK1/2 produces the mitochondrial anti-apoptotic proteins, and the signaling pathway from LPS and N-formylmethionylleucylphenylalanine to p38 is the main pathway for reactive oxygen species production. The mechanism of anti-inflammatory effect of LPZ on hyper-activated neutrophils is suggested to be the suppression of signal transduction of ERK1/2 and p38 MAPK.
authors.affiliation: Department of Microbiology and Immunology, Teikyo University School of Medicine, 2-11-1 Kaga, Itabashi-ku, Tokyo, 173-8605, Japan. koshio@med.teikyo-u.ac.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Koshio
authors.forename: Shigeru
authors.initials: S
authors.lastname: Tansho
authors.forename: Tsuneyuki
authors.initials: T
authors.lastname: Ubagai
authors.forename: Toshio
authors.initials: T
authors.lastname: Nakaki
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Ono
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles / Q000494:pharmacology*; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D006801:Humans; D064747:Lansoprazole; D020935:MAP Kinase Signaling System / Q000187:drug effects*; D009504:Neutrophils / Q000187:drug effects / Q000201:enzymology*; D010766:Phosphorylation / Q000187:drug effects; D054328:Proton Pump Inhibitors; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism*
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D004791:Enzyme Inhibitors; D054328:Proton Pump Inhibitors; D064747:Lansoprazole; D048049:Extracellular Signal-Regulated MAP Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D013755:Tetradecanoylphorbol Acetate