title: Characteristics of Helicobacter pylori strains isolated from patients with different gastric diseases.
abstract: The pathogenesis of chronic gastritis, gastric ulcer, duodenal ulcer, gastric cancer, and remnant gastritis is considered to be related to infection by Helicobacter pylori. The purpose of this study was to investigate the characteristics of H. pylori strains isolated from patients with various gastric diseases. Fifty strains of H. pylori were clinically isolated at Keio University Hospital and were assessed for (i) vacuolating cytotoxin (VT) production, by cytotoxic assay using rabbit kidney (RK) 13 cells; (ii) the expression of cytotoxin associated gene (cagA), by polymerase chain reaction; and (iii) motility on a semi-solid plate. Positivity for VT production by H. pylori strains isolated from patients with chronic gastritis, gastric ulcer, duodenal ulcer, gastric cancer, and remnant gastritis, was 100%, 89%, 92%, 100%, and 60%, respectively. There was no significant difference in the incidence of positivity for cagA among the strains isolated from different gastric diseases. Swarming distances, which indicate motility of H. pylori strains, were 12.7, 13.2, 12.8, 16.6 and 9.2mm in strains from chronic gastritis, gastric ulcer, duodenal ulcer, gastric cancer, and remnant gastritis, respectively, with H. pylori isolated from remnant gastritis showing significantly less motility than H. pylori isolates from other diseases. There were no significant differences in VT production and cagA positivity among the H. pylori strains.
authors.affiliation: Department of Surgery and Institute of Clinical Research, National Okura Hospital, Tokyo, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kurihara
authors.forename: S
authors.initials: S
authors.lastname: Kamiya
authors.forename: H
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: T
authors.initials: T
authors.lastname: Osaki
authors.forename: H
authors.initials: H
authors.lastname: Shinohara
authors.forename: T
authors.initials: T
authors.lastname: Kitahora
authors.forename: H
authors.initials: H
authors.lastname: Ishida
authors.forename: A
authors.initials: A
authors.lastname: Ozawa
authors.forename: Y
authors.initials: Y
authors.lastname: Otani
authors.forename: T
authors.initials: T
authors.lastname: Kubota
authors.forename: K
authors.initials: K
authors.lastname: Kumai
authors.forename: M
authors.initials: M
authors.lastname: Kitajima
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial; D018407:Bacterial Physiological Phenomena; D001426:Bacterial Proteins / Q000378:metabolism; D003603:Cytotoxins / Q000378:metabolism; D004269:DNA, Bacterial / Q000302:isolation & purification; D016481:Helicobacter Infections / Q000382:microbiology* / Q000473:pathology; D016480:Helicobacter pylori / Q000145:classification / Q000502:physiology*; D006801:Humans; D013272:Stomach Diseases / Q000382:microbiology* / Q000473:pathology
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D003603:Cytotoxins; D004269:DNA, Bacterial; C074689:VacA protein, Helicobacter pylori; C080866:cagA protein, Helicobacter pylori