title: Topographic expression of MUC5AC and MUC6 in the gastric mucosa infected by Helicobacter pylori and in associated diseases.
abstract: We investigated the topographic expression of MUC5AC and MUC6 in relationship with gastric diseases. The immunoexpression of MUC5AC and MUC6 was evaluated in 75 adults presenting Helicobacter pylori gastritis (n = 22; 11 cagA positive), duodenal ulcer (DU, n = 11), gastric ulcer (GU, n = 9), gastric carcinoma (GC, n = 20), and normal mucosa (H. pylori negative, n = 13). Five gastric areas (antral and corporeal lesser and greater curvatures and incisura) were studied. H. pylori was detected by carbolfuchsin, urease, and culture; cagA was determined by PCR. All patients with DU (eight with GU and 13 with GC) were H. pylori-positive. In H. pylori gastritis, MUC5AC expression was higher in the antrum than in the corpus; no difference was observed with respect to cagA status. MUC5AC expression was higher in the antrum of gastritis than in DU, and it was lower in the incisura among GU patients compared to DU. MUC6 expression was higher in the antrum of H. pylori gastritis compared to DU and to uninfected patients. No difference was observed in the topographic pattern of expression of MUC5AC and MUC6 among GC cases. The topographic over- and under-expression of mucins in H. pylori-associated gastritis and peptic disease suggest a role for these mucins in the pathogenesis of H. pylori infection and associated diseases.
authors.affiliation: Department of Pathology, Medical School, Federal University of Minas Gerais UFMG, Brazil.
authors.forename: Terezinha
authors.initials: T
authors.lastname: Marques
authors.forename: Leonor
authors.initials: L
authors.lastname: David
authors.forename: Celso
authors.initials: C
authors.lastname: Reis
authors.forename: Ana
authors.initials: A
authors.lastname: Nogueira
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D000942:Antigens, Bacterial / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D004381:Duodenal Ulcer / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D005753:Gastric Mucosa / Q000033:anatomy & histology / Q000378:metabolism* / Q000473:pathology; D005756:Gastritis / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D016481:Helicobacter Infections / Q000150:complications / Q000378:metabolism* / Q000473:pathology; D016480:Helicobacter pylori / Q000302:isolation & purification / Q000378:metabolism / Q000472:pathogenicity*; D006801:Humans; D007150:Immunohistochemistry; D055271:Mucin 5AC; D055272:Mucin-6; D009077:Mucins / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D013276:Stomach Ulcer / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D014510:Urease / Q000378:metabolism
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C524678:MUC5AC protein, human; C524734:MUC6 protein, human; D055271:Mucin 5AC; D055272:Mucin-6; D009077:Mucins; C080866:cagA protein, Helicobacter pylori; D014510:Urease