title: Distinct elevation of levels of anti-Caenorhabditis elegans antibody in sera of patients with inflammatory bowel disease.
abstract: Dysregulation of immune responses to intestinal exogenous antigens contributes to the pathogenesis of inflammatory bowel disease, but the specific antigen responsible for the pathogenesis of inflammatory bowel disease is unknown. We measured serum antibody titers against Caenorhabditis elegans antigens. Immunoglobulin G (IgG) and IgG subclass anti-C. elegans antibodies in serum samples from 29 patients with ulcerative colitis, 30 patients with Crohn's disease, 7 patients with intestinal Behçet's disease, and 11 healthy controls were measured by enzyme-linked immunosorbent assay. Serum IgG and IgG2 antibody titers against C. elegans were significantly higher in patients with inflammatory bowel disease than in controls. Antibody levels were not affected by age, gender, disease activity, extent of disease, or small bowel involvement. The anti-C. elegans antibody titer was significantly lower in patients with Crohn's disease taking mesalazine or sulfasalazine than in patients not taking these drugs. The increased immune responses to C. elegans found in patients with inflammatory bowel disease reflect dysregulated immune responses to enteric antigens, which might play a role in the pathogenesis of inflammatory bowel disease.
authors.affiliation: Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka 545-8585 Japan. nobu@med.osaka-cu.ac.jp
authors.forename: Nobuhide
authors.initials: N
authors.lastname: Oshitani
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Hato
authors.forename: Seiichi
authors.initials: S
authors.lastname: Kitagawa
authors.forename: Kenji
authors.initials: K
authors.lastname: Watanabe
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Fujiwara
authors.forename: Kazuhide
authors.initials: K
authors.lastname: Higuchi
authors.forename: Takayuki
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Arakawa
mesh_terms: D000328:Adult; D000368:Aged; D000818:Animals; D000890:Anti-Infective Agents / Q000627:therapeutic use; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use; D000941:Antigens / Q000276:immunology; D017173:Caenorhabditis elegans / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood* / Q000187:drug effects; D015212:Inflammatory Bowel Diseases / Q000097:blood* / Q000188:drug therapy / Q000276:immunology*; D008297:Male; D019804:Mesalamine / Q000627:therapeutic use; D008875:Middle Aged; D012460:Sulfasalazine / Q000627:therapeutic use
chemical_list: D000890:Anti-Infective Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D000941:Antigens; D007074:Immunoglobulin G; D012460:Sulfasalazine; D019804:Mesalamine