title: Effect of Helicobacter pylori eradication on cyclooxygenase 2 (COX-2) and inducible nitric oxide synthase (iNOS) expression during gastric adaptation to aspirin (ASA) in humans.
abstract: Gastric adaptation to aspirin is impaired in Helicobacter pylori infection, but the mechanisms underlying this phenomenon are unclear. In this study, we compared gastric mucosal expression of iNOS and COX-2 during 14 days of aspirin ingestion in the same subjects before and 3 months after eradication of H. pylori. Compared to non-infected controls, mucosal expression of COX-2 and iNOS was enhanced before and 3 months after eradication of H. pylori. During aspirin ingestion, mucosal expression of COX-2 remained unchanged before eradication of H. pylori, but increased gradually after successful antimicrobial treatment. Independent of H. pylori status, expression of iNOS increased at the beginning of aspirin intake, but then returned to initial values. We conclude that COX-2 but not iNOS might be involved in gastric adaptation to aspirin in humans and that this mechanism appears to be impaired in H. pylori infection.
authors.affiliation: Department of Medicine B, University of Münster, Münster, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Fischer
authors.forename: V
authors.initials: V
authors.lastname: Huber
authors.forename: P
authors.initials: P
authors.lastname: Boknik
authors.forename: H
authors.initials: H
authors.lastname: Luess
authors.forename: J
authors.initials: J
authors.lastname: Neumann
authors.forename: W
authors.initials: W
authors.lastname: Schmitz
authors.forename: W
authors.initials: W
authors.lastname: Domschke
authors.forename: J W
authors.initials: JW
authors.lastname: Konturek
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000658:Amoxicillin / Q000627:therapeutic use; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D001241:Aspirin / Q000494:pharmacology*; D015153:Blotting, Western; D017291:Clarithromycin / Q000627:therapeutic use; D051546:Cyclooxygenase 2; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors / Q000494:pharmacology*; D004591:Electrophoresis, Polyacrylamide Gel; D005753:Gastric Mucosa / Q000201:enzymology*; D016481:Helicobacter Infections / Q000188:drug therapy* / Q000201:enzymology / Q000473:pathology; D016480:Helicobacter pylori; D006801:Humans; D007150:Immunohistochemistry; D007527:Isoenzymes / Q000096:biosynthesis / Q000378:metabolism*; D064747:Lansoprazole; D008565:Membrane Proteins; D019001:Nitric Oxide Synthase / Q000096:biosynthesis / Q000378:metabolism*; D052247:Nitric Oxide Synthase Type II; D009853:Omeprazole / Q000031:analogs & derivatives / Q000627:therapeutic use; D011451:Prostaglandin-Endoperoxide Synthases / Q000096:biosynthesis / Q000378:metabolism*
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D052246:Cyclooxygenase 2 Inhibitors; D016861:Cyclooxygenase Inhibitors; D007527:Isoenzymes; D008565:Membrane Proteins; D064747:Lansoprazole; D000658:Amoxicillin; C496319:NOS2 protein, human; D019001:Nitric Oxide Synthase; D052247:Nitric Oxide Synthase Type II; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D017291:Clarithromycin; D009853:Omeprazole; D001241:Aspirin