title: Mucosal immune response to Helicobacter pylori and cytotoxic mechanism.
abstract: BACKGROUND
  Helicobacter pylori is widely accepted as a major pathogen in gastritis. The histologic features of H. pylori gastritis are the numerous infiltrating mononuclear cells (MNCs) and neutrophils. It is not clear what role the infiltrating MNCs and neutrophils play in H. pylori gastritis.
  
  
  METHODS
  In this study, we have established enzyme-linked immunospot (ELISPOT) assay for the measurement of H. pylori antibody-producing cells in gastric mucosa.
  
  
  RESULTS
  Using ELISPOT assay, we found that H. pylori-specific IgA-producing cells as well as IgG-producing cells were distributed in gastric mucosa. These H. pylori-specific antibodies in gastric mucosa and neutrophils are responsible for the induction of cytotoxic effect to cultured Vero cells.
  
  
  CONCLUSIONS
  These observations suggest that a mucosal immune response specific to H. pylori is closely associated with the pathogenesis of gastritis.
authors.affiliation: Dept. of Internal Medicine, Sapporo Medical University, School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Sugiyama
authors.forename: T
authors.initials: T
authors.lastname: Yabana
authors.forename: A
authors.initials: A
authors.lastname: Yachi
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000921:Antibody-Producing Cells / Q000276:immunology; D000942:Antigens, Bacterial / Q000276:immunology; D002522:Chlorocebus aethiops; D003602:Cytotoxicity, Immunologic; D004797:Enzyme-Linked Immunosorbent Assay; D005753:Gastric Mucosa / Q000276:immunology* / Q000382:microbiology / Q000473:pathology; D005756:Gastritis / Q000276:immunology* / Q000382:microbiology / Q000473:pathology; D016481:Helicobacter Infections / Q000276:immunology / Q000473:pathology; D016480:Helicobacter pylori / Q000276:immunology*; D006801:Humans; D007070:Immunoglobulin A / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000096:biosynthesis; D007963:Leukocytes, Mononuclear / Q000473:pathology; D009504:Neutrophils / Q000473:pathology; D014709:Vero Cells
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D007070:Immunoglobulin A; D007074:Immunoglobulin G