title: A confirmatory report for the close interaction of Helicobacter pylori with gastric epithelial MUC5AC expression.
abstract: BACKGROUND
  Helicobacter pylori (H. pylori) infection is associated with the development of gastritis and peptic ulcer and is presumed to be a risk factor for low-grade B-cell lymphoma and gastric cancer. H. pylori also causes critical alterations in gastric mucin structure. Our aim was to determine the effect of H. pylori on MUC1, MUC2, and MUC5AC expression.
  
  
  METHODS
  Thirty H. pylori-positive and 15 H. pylori-negative antral gastric endoscopic biopsy specimens were evaluated for MUC1, MUC2, and MUC5AC expression with immunohistochemical staining. From the same specimens, we scrutinized the presence of H. pylori infection by hematoxylin and eosin and immunohistochemical staining.
  
  
  RESULTS
  In H. pylori infected patients, the expression of MUC5AC was found to be localized to the cells in the superficial epithelium and upper parts of the gastric glands. The number of MUC5AC-expressing cells and the staining intensity of MUC5AC were shown to decrease in patients with H. pylori infection. Histopathology and immunostaining patterns of gastric mucins implied that H. pylori was physically associated with extracellular MUC5AC and MUC5AC-producing cells. H. pylori infection does not significantly affect staining intensity and patterns of MUC1 and MUC2 expressions. MUC1 was not found in dysplastic tissues or intestinal metaplasia areas. MUC5AC was expressed in dysplastic areas, but not in intestinal metaplasia. MUC2 was expressed in both dysplastic and intestinal metaplasia areas.
  
  
  CONCLUSIONS
  H. pylori decreases the amount of MUC5AC expression. With reducing MUC5AC-producing cells and MUC5AC mucin, H. pylori may potentially cause significant alterations of the structure and function of gastric mucins. H. pylori-dependent inhibition of mucin synthesis deserves more investigations to clarify the role of H. pylori and gastric MUC5AC interaction.
authors.affiliation: Surgery Department, Ankara Numune Research and Teaching Hospital, Opera, Ankara, Turkey. belmak@mailcity.com
authors.forename: Belma
authors.initials: B
authors.lastname: Kocer
authors.forename: Murat
authors.initials: M
authors.lastname: Ulas
authors.forename: Yucel
authors.initials: Y
authors.lastname: Ustundag
authors.forename: Sibel
authors.initials: S
authors.lastname: Erdogan
authors.forename: Melih
authors.initials: M
authors.lastname: Karabeyoglu
authors.forename: Osman
authors.initials: O
authors.lastname: Yldrm
authors.forename: Bülent
authors.initials: B
authors.lastname: Unal
authors.forename: Omer
authors.initials: O
authors.lastname: Cengiz
authors.forename: Atilla
authors.initials: A
authors.lastname: Soran
mesh_terms: D000328:Adult; D000368:Aged; D001707:Biopsy, Needle; D016022:Case-Control Studies; D046508:Culture Techniques; D005260:Female; D005753:Gastric Mucosa / Q000276:immunology* / Q000473:pathology; D005756:Gastritis / Q000276:immunology* / Q000382:microbiology / Q000473:pathology; D005786:Gene Expression Regulation; D005819:Genetic Markers; D016481:Helicobacter Infections / Q000276:immunology* / Q000473:pathology; D016480:Helicobacter pylori / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D055271:Mucin 5AC; D009077:Mucins / Q000235:genetics / Q000378:metabolism*; D011336:Probability; D011379:Prognosis; D012016:Reference Values; D012680:Sensitivity and Specificity
chemical_list: D005819:Genetic Markers; C524678:MUC5AC protein, human; D055271:Mucin 5AC; D009077:Mucins