title: Phenotypic and genotypic characterization of Helicobacter pylori from patients with and without peptic ulcer disease.
abstract: BACKGROUND
  Helicobacter pylori plays an important role in peptic ulcer disease, although not all H. pylori-infected persons will develop a peptic ulcer. Currently, H. pylori strains cannot be divided into commensals and pathogens.
  
  
  METHODS
  Fifty H. pylori strains were cultured from patients divided into five groups on the basis of upper endoscopic findings: gastric ulcer, duodenal ulcer, gastritis, esophagitis, or normal. The ultrastructural adherence pattern in vivo, autoagglutination, hemagglutination, adhesion to human gastric adenocarcinoma (AGS) cells, and the lipopolysaccharide (LPS) profile of H. pylori strains were recorded; randomly amplified polymorphic DNA (RAPD) and urease gene typing were performed and correlated with diagnostic groups.
  
  
  RESULTS
  Electron micrographs showed that H. pylori strains from patients with gastric ulcers adhered more frequently through filamentous strands and were less frequently found free in mucus than any other diagnostic group (P < 0.0001). Neither median hemagglutination titer nor median adhesion capacity to a human gastric adenocarcinoma cell line was related to endoscopic findings. Nevertheless, H. pylori strains from patients with gastric ulcers were more prone to autoagglutinate than were strains from the other diagnostic groups (P = 0.03). H. pylori strains from gastric ulcer patients were found to be more homogeneous, as determined by RAPD and urease gene typing, than strains from the other diagnostic groups (P < 0.01). In addition, a positive correlation was found between a patient's age and the adhesion to AGS cells of the patient's H. pylori strain (P = 0.006).
  
  
  CONCLUSIONS
  A combination of an H. pylori autoagglutination test, RAPD, and urease gene typing may be useful in separating gastric ulcer-related strains from duodenal ulcer-related and non-ulcer dyspepsia-related strains.
authors.affiliation: Dept. of Gastro-Intestinal Infections, Statens Serum Institut, Copenhagen, Denmark.
authors.forename: A M
authors.initials: AM
authors.lastname: Petersen
authors.forename: V
authors.initials: V
authors.lastname: Fussing
authors.forename: H
authors.initials: H
authors.lastname: Colding
authors.forename: J
authors.initials: J
authors.lastname: Blom
authors.forename: A
authors.initials: A
authors.lastname: Nørgaard
authors.forename: L P
authors.initials: LP
authors.lastname: Andersen
authors.forename: K A
authors.initials: KA
authors.lastname: Krogfelt
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001422:Bacterial Adhesion; D016009:Chi-Square Distribution; D016172:DNA Fingerprinting; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005838:Genotype; D016481:Helicobacter Infections / Q000453:epidemiology; D016480:Helicobacter pylori / Q000235:genetics* / Q000302:isolation & purification; D006384:Hemagglutination; D006801:Humans; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D010437:Peptic Ulcer / Q000382:microbiology*; D010641:Phenotype; D012150:Polymorphism, Restriction Fragment Length; D012044:Regression Analysis; D016622:Silver Staining; D018709:Statistics, Nonparametric