title: Helicobacter pylori infection induces cyclooxygenase-2 expression in human gastric mucosa.
abstract: Recent studies indicate that expression of mitogen-inducible cyclooxygenase-2 (COX-2) occurs in gastrointestinal tumors. We investigated the effects of Helicobacter pylori (H. pylori) infection, a class I carcinogen for the human stomach, on gastric COX-2 expression using immunohistochemistry. Human subjects without macroscopic lesions, as determined by endoscopic screening, were biopsied for H. pylori infection. The biopsy samples were immunohistochemically examined for COX-2 expression. COX-2 was expressed in gastric epithelia and subepithelial inflammatory cells in all H. pylori-infected subjects. There was no expression of COX-2 in the gastric mucosa of H. pylori-negative subjects. COX-2 expression has been reported in gastrointestinal carcinomas, gastrointestinal cancer cell-lines, and in the gut after carcinogenic treatment. The present study demonstrates that H. pylori infection leads to gastric mucosal expression of COX-2, indicating that the enzyme is involved in H. pylori-related gastric pathology in humans.
authors.affiliation: First Department of Medicine, Osaka University School of Medicine, Suita, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sawaoka
authors.forename: S
authors.initials: S
authors.lastname: Kawano
authors.forename: S
authors.initials: S
authors.lastname: Tsuji
authors.forename: M
authors.initials: M
authors.lastname: Tsuji
authors.forename: W
authors.initials: W
authors.lastname: Sun
authors.forename: E S
authors.initials: ES
authors.lastname: Gunawan
authors.forename: M
authors.initials: M
authors.lastname: Hori
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D051546:Cyclooxygenase 2; D004847:Epithelial Cells / Q000201:enzymology / Q000473:pathology; D005260:Female; D005753:Gastric Mucosa / Q000201:enzymology* / Q000382:microbiology* / Q000473:pathology; D016481:Helicobacter Infections / Q000201:enzymology*; D016480:Helicobacter pylori; D006801:Humans; D007527:Isoenzymes / Q000276:immunology / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins; D008875:Middle Aged; D011451:Prostaglandin-Endoperoxide Synthases / Q000276:immunology / Q000378:metabolism*
chemical_list: D007527:Isoenzymes; D008565:Membrane Proteins; D051546:Cyclooxygenase 2; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases