title: Cross-reactive antigens shared by Pseudomonas aeruginosa, Helicobacter pylori, Campylobacter jejuni, and Haemophilus influenzae may cause false-positive titers of antibody to H. pylori.
abstract: Cystic fibrosis (CF) patients suffer from many of the gastrointestinal conditions which occur in non-CF individuals, e.g., dyspepsia and peptic ulceration. These symptoms may be caused by Helicobacter pylori but could also be due to either pancreatic insufficiency or the intensive antibiotic treatment used in CF patients. Since CF patients chronically infected with Pseudomonas aeruginosa produce antibodies against a wide range of antigens, including antigens common to many other bacteria, e.g., GroEL and lipopolysaccharide, we studied, by the Western blot (immunoblot) technique, the specificity of immunoglobulin G antibodies to H. pylori in Danish CF patients chronically infected with P. aeruginosa, CF patients without P. aeruginosa infection but with Haemophilus influenzae infection, patients with dyspeptic ulcers associated with H. pylori, and patients recovering from acute Campylobacter jejuni or Campylobacter coli infection. Sera from CF patients with chronic P. aeruginosa or H. influenzae infection and patients recovering from acute C. jejuni infection cross-reacted with H. pylori antigens. A strong cross-reacting protein antigen at approximately 14 kDa and minor cross-reactive antigens at approximately 27, 30, and 60 kDa (the heat shock protein GroEL is equivalent to the common antigen of P. aeruginosa) could be demonstrated. The results of this study show that high immunoglobulin G antibody titers against H. pylori in CF patients cannot be regarded as indicating present or past H. pylori infection unless their specificity is proven by absorption studies.
authors.affiliation: Department of Clinical Microbiology, Danish Cystic Fibrosis Centre, Rigshospitalet, Copenhagen.
authors.forename: H K
authors.initials: HK
authors.lastname: Johansen
authors.forename: A
authors.initials: A
authors.lastname: Nørgaard
authors.forename: L P
authors.initials: LP
authors.lastname: Andersen
authors.forename: P
authors.initials: P
authors.lastname: Jensen
authors.forename: H
authors.initials: H
authors.lastname: Nielsen
authors.forename: N
authors.initials: N
authors.lastname: Høiby
mesh_terms: D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000276:immunology*; D015153:Blotting, Western; D002169:Campylobacter Infections / Q000097:blood / Q000276:immunology*; D016123:Campylobacter jejuni / Q000276:immunology*; D018834:Chaperonin 60 / Q000276:immunology; D003429:Cross Reactions; D003550:Cystic Fibrosis / Q000097:blood / Q000382:microbiology*; D005189:False Positive Reactions; D006192:Haemophilus Infections / Q000097:blood / Q000276:immunology*; D006193:Haemophilus influenzae / Q000276:immunology*; D016481:Helicobacter Infections / Q000097:blood / Q000276:immunology*; D016480:Helicobacter pylori / Q000276:immunology*; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis / Q000096:biosynthesis; D011552:Pseudomonas Infections / Q000097:blood / Q000276:immunology*; D011550:Pseudomonas aeruginosa / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D018834:Chaperonin 60; D007074:Immunoglobulin G