title: Topographic study of Helicobacter pylori and HLA-DR antigen expression on gastric epithelium.
abstract: Helicobacter pylori and HLA-DR antigen expression on gastric epithelium, identified by an indirect immunoperoxidase staining method using monoclonal antibodies against H. pylori and HLA-DR antigens, were studied topographically. Fifty-nine biopsy specimens from 41 patients who had neither gastric cancer nor peptic ulcers were examined. H. pylori was observed predominantly over or on the surface epithelium, while HLA-DR antigens were frequently expressed on the epithelium of the isthmus region. These observations led to the conclusion that there was no direct topographic association between H. pylori and epithelial HLA-DR expression. However, the frequency of HLA-DR expression in H. pylori-positive (28/29) specimens was significantly higher than that in H. pylori-negative (18/30) specimens (P < 0.01). Furthermore, a greater number of H. pylori was associated with a stronger expression of HLA-DR antigens (P < 0.001). We conclude that H. pylori is indirectly related to HLA-DR expression on gastric epithelium. H. pylori is the first microbial agent that has been suggested to be associated with epithelial HLA-DR expression in the human gastrointestinal tract.
authors.affiliation: First Department of Internal Medicine, Akita University School of Medicine, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Chiba
authors.forename: N
authors.initials: N
authors.lastname: Ishii
authors.forename: T
authors.initials: T
authors.lastname: Ishioka
authors.forename: M
authors.initials: M
authors.lastname: Murata
authors.forename: O
authors.initials: O
authors.lastname: Masamune
authors.forename: T
authors.initials: T
authors.lastname: Sugiyama
authors.forename: A
authors.initials: A
authors.lastname: Yachi
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal; D001706:Biopsy; D005260:Female; D005753:Gastric Mucosa / Q000276:immunology / Q000382:microbiology; D005756:Gastritis / Q000276:immunology / Q000382:microbiology*; D006684:HLA-DR Antigens / Q000032:analysis*; D016481:Helicobacter Infections / Q000276:immunology / Q000382:microbiology; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D007124:Immunoenzyme Techniques; D008198:Lymph Nodes / Q000276:immunology / Q000382:microbiology; D008297:Male; D008875:Middle Aged
chemical_list: D000911:Antibodies, Monoclonal; D006684:HLA-DR Antigens