alexa The presence of GAD and IA-2 antibodies in youth with a type 2 diabetes phenotype: results from the TODAY study.
Diabetes & Endocrinology

Diabetes & Endocrinology

Journal of Diabetes & Metabolism

Author(s): Klingensmith GJ, Pyle L, Arslanian S, Copeland KC, Cuttler L,

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Abstract OBJECTIVE: To determine the frequency of islet cell autoimmunity in youth clinically diagnosed with type 2 diabetes and describe associated clinical and laboratory findings. RESEARCH DESIGN AND METHODS: Children (10-17 years) diagnosed with type 2 diabetes were screened for participation in the Treatment Options for Type 2 Diabetes in Adolescents and Youth (TODAY) study. Measurements included GAD-65 and insulinoma-associated protein 2 autoantibodies using the new National Institute of Diabetes and Digestive and Kidney Diseases/National Institutes of Health (NIDDK/NIH) standardized assays, a physical examination, and fasting lipid, C-peptide, and A1C determinations. RESULTS: Of the 1,206 subjects screened and considered clinically to have type 2 diabetes, 118 (9.8\%) were antibody positive; of these, 71 (5.9\%) were positive for a single antibody, and 47 were positive (3.9\%) for both antibodies. Diabetes autoantibody (DAA) positivity was significantly associated with race (P < 0.0001), with positive subjects more likely to be white (40.7 vs. 19\%) (P < 0.0001) and male (51.7 vs. 35.7\%) (P = 0.0007). BMI, BMI z score, C-peptide, A1C, triglycerides, HDL cholesterol, and blood pressure were significantly different by antibody status. The antibody-positive subjects were less likely to display characteristics clinically associated with type 2 diabetes and a metabolic syndrome phenotype, although the range for BMI z score, blood pressure, fasting C-peptide, and serum lipids overlapped between antibody-positive and antibody-negative subjects. CONCLUSIONS: Obese youth with a clinical diagnosis of type 2 diabetes may have evidence of islet autoimmunity contributing to insulin deficiency. As a group, patients with DAA have clinical characteristics significantly different from those without DAA. However, without islet autoantibody analysis, these characteristics cannot reliably distinguish between obese young individuals with type 2 diabetes and those with autoimmune diabetes. TRIAL REGISTRATION: ClinicalTrials.gov NCT00081328.
This article was published in Diabetes Care and referenced in Journal of Diabetes & Metabolism

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