title: Serological analysis of Helicobacter hepaticus infection in patients with biliary and pancreatic diseases.
abstract: OBJECTIVE
  Infection with Helicobacter hepaticus has been associated with development of hepatocellular carcinoma and gallstones in animal models. In humans, however, the association of H. hepaticus infection with biliary and pancreatic diseases has not been elucidated. The aim of this study was to serologically examine the prevalence of H. hepaticus infection in patients with biliary and pancreatic diseases.
  
  
  METHODS
  Serum samples obtained from 55 patients with cholelithiasis, 18 with bile duct or gallbladder cancer and 19 with pancreatic cancer were studied. Sera were obtained from 34 control subjects who underwent endoscopy and were diagnosed as not having peptic ulcers or cancers. Seropositivity of H. hepaticus was examined by western blot analysis using a H. hepaticus-specific antigen. To validate the specificity, positive sera were also tested after absorption with H. hepaticus whole-cell sonicate. Serum samples were also tested for the presence of anti-Helicobacter pylori antibody.
  
  
  RESULTS
  Prevalence of antibody to H. hepaticus-specific antigen in patients with bile tract cancer was 38.8% and was significantly higher than in control subjects (13.1%, P < 0.05). Prevalence of antibody to H. hepaticus-specific antigen was 18.2% and 10.5% in patients with cholelithiasis and pancreatic cancer, respectively. Seropositivity for H. pylori was similar in all groups. Detection of the H. hepaticus-specific band was significantly decreased after the sera were absorbed with H. hepaticus whole-cell sonicate.
  
  
  CONCLUSIONS
  Infection with H. hepaticus might be associated with bile duct cancer. Results obtained from absorbed sera suggested high specificity of the western blot analysis.
authors.affiliation: Department of Gastroenterology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan. tsimo-hki@umin.ac.jp
authors.forename: Tadashi
authors.initials: T
authors.lastname: Shimoyama
authors.forename: Ryoki
authors.initials: R
authors.lastname: Takahashi
authors.forename: Daijiro
authors.initials: D
authors.lastname: Abe
authors.forename: Ichiro
authors.initials: I
authors.lastname: Mizuki
authors.forename: Tetsu
authors.initials: T
authors.lastname: Endo
authors.forename: Shinsaku
authors.initials: S
authors.lastname: Fukuda
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000907:Antibodies, Bacterial / Q000097:blood*; D001650:Bile Duct Neoplasms / Q000097:blood / Q000453:epidemiology; D001660:Biliary Tract Diseases / Q000097:blood* / Q000453:epidemiology; D015415:Biomarkers / Q000097:blood; D015153:Blotting, Western; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D002769:Cholelithiasis / Q000097:blood / Q000453:epidemiology; D005260:Female; D005706:Gallbladder Neoplasms / Q000097:blood / Q000453:epidemiology; D016481:Helicobacter Infections / Q000097:blood* / Q000453:epidemiology / Q000382:microbiology; D044923:Helicobacter hepaticus / Q000276:immunology*; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000097:blood* / Q000453:epidemiology; D016036:Seroepidemiologic Studies
chemical_list: D000907:Antibodies, Bacterial; D015415:Biomarkers