title: Significance of IA-2 antibody in Japanese type 1 diabetes: its association with GAD antibody.
abstract: To investigate the presence and level of serum antibodies to IA-2 (IA-2A) in Japanese patients with adult type 1 diabetes in order to clarify its association with glutamic acid decarboxylase (GAD) antibody. Serum samples were obtained from 101 Japanese patients with type 1 diabetes, including 37 patients with slowly progressive form of type 1 diabetes. Serum levels of IA-2A and GADA were determined by radioimmunoassay. The study had a cross-sectional design. IA-2A and GADA were detected in 37 and 59% of these patients, respectively. Of the 37 slowly progressive form of patients, IA-2A and GADA were present in 49 and 86%, respectively (NS). GADA levels were significantly higher (P<0.05) in IA-2A positive than in IA-2A negative patients in slowly progressive form, but IA-2A levels did not differ significantly between GADA positive and GADA negative patients. Measuring IA-2A in combination with GADA is useful for the diagnosis and prognosis of type 1 diabetes in Japanese.
authors.affiliation: Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Science, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8641, Japan.
authors.forename: Tsuguhito
authors.initials: T
authors.lastname: Ota
authors.forename: Toshinari
authors.initials: T
authors.lastname: Takamura
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Nagai
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Bando
authors.forename: Rika
authors.initials: R
authors.lastname: Usuda
mesh_terms: D000328:Adult; D001323:Autoantibodies / Q000097:blood*; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000276:immunology*; D005968:Glutamate Decarboxylase / Q000276:immunology*; D006801:Humans; D007564:Japan; D015995:Prevalence
chemical_list: D001323:Autoantibodies; C096322:ICA512 autoantibody; D005968:Glutamate Decarboxylase