title: Frequency of pancreatic beta-cell autoimmunity markers in patients with autoimmune thyroid disease.
abstract: A total of 305 ambulatory patients recruited at the Division of Endocrinology, Hospital de Clínicas, University of Buenos Aires, with autoimmune thyroid disease (AITD) were studied to search for associations between autoimmune thyroid disease and presence of serum markers of autoimmune diabetes mellitus. Screening for markers of pancreatic beta-cell autoimmunity was performed by radioligand binding assays (RBA) as follows: autoantibodies to glutamic acid decarboxylase (GADA) and proinsulin (PAA) were determined in all sera, whereas autoantibodies to protein tyrosine phosphatase (IA-2A) and insulin (IAA) were additionally measured in 200 sera randomly selected from the total collection. In addition, every GADA positive serum among the remaining 105 sera was systematically tested for the presence of IA-2A and IAA. In the cohort of 305 AITD patients 22 (7.2%) were previously diagnosed as type 1, type 2 or insulin-requiring type 2 diabetics. Ten of these patients presented serum marker positivity specific for beta-cell autoantigens and 12 were marker negative. On the other hand, considering the majority of non-diabetic AITD patients (n = 283), beta3-cell marker positivity was detected in 17 individuals (6.0%). The prevalence of autoimmune diabetes markers was much higher in the studied population than in the general population utilized as a control group, and GADA was the most frequent marker.
authors.affiliation: División de Endocrinología, Hospital de Clínicas, Facultad de Medicina, Buenos Aires, Argentina. meprimo@ffyb.uba.ar
authors.forename: María E
authors.initials: ME
authors.lastname: Primo
authors.forename: Hugo
authors.initials: H
authors.lastname: Niepomniszcze
authors.forename: Edgardo
authors.initials: E
authors.lastname: Poskus
authors.forename: Monica S
authors.initials: MS
authors.lastname: Sala
authors.forename: Silvia S
authors.initials: SS
authors.lastname: Guaita
authors.forename: Mauricio P
authors.initials: MP
authors.lastname: Sica
authors.forename: Anabel
authors.initials: A
authors.lastname: Villalba
authors.forename: Alejandro
authors.initials: A
authors.lastname: Cardoso
authors.forename: Oscar D
authors.initials: OD
authors.lastname: Bruno
mesh_terms: D001323:Autoantibodies / Q000097:blood*; D001327:Autoimmune Diseases / Q000276:immunology*; D015551:Autoimmunity / Q000276:immunology*; D015415:Biomarkers / Q000097:blood; D016022:Case-Control Studies; D003920:Diabetes Mellitus / Q000276:immunology*; D003922:Diabetes Mellitus, Type 1 / Q000175:diagnosis / Q000276:immunology; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis / Q000276:immunology; D005260:Female; D005968:Glutamate Decarboxylase / Q000097:blood; D006111:Graves Disease / Q000097:blood / Q000276:immunology; D050031:Hashimoto Disease / Q000097:blood / Q000276:immunology; D006801:Humans; D050417:Insulin-Secreting Cells / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011384:Proinsulin / Q000097:blood; D013959:Thyroid Diseases / Q000175:diagnosis / Q000276:immunology*; D013967:Thyroiditis, Autoimmune / Q000097:blood / Q000276:immunology
chemical_list: D001323:Autoantibodies; D015415:Biomarkers; D011384:Proinsulin; D005968:Glutamate Decarboxylase