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Glucose tolerance and beta-cell function in islet autoantibody-positive children recruited to a secondary prevention study
Department of Clinical Sciences, Lund University/CRC, Skåne University Hospital SUS, Malmö, Sweden.
Department of Paediatrics, Lund University, Skåne University Hospital SUS, Lund, Sweden.
Department of Clinical Sciences, Lund University/CRC, Skåne University Hospital SUS, Malmö, Sweden.
Department of Paediatrics, Helsingborg Hospital, Helsingborg, Sweden.
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2013 (English)In: Pediatric Diabetes, ISSN 1399-543X, E-ISSN 1399-5448, Vol. 14, no 5, 341-349 p.Article in journal (Refereed) Published
Abstract [en]

AIMS: Children with type 1 diabetes (T1D) risk and islet autoantibodies are recruited to a secondary prevention study. The aims were to determine metabolic control in relation to human leukocyte antigen (HLA) genetic risk and islet autoantibodies in prepubertal children.

METHODS: In 47 healthy children with GADA and at least one additional islet autoantibody, intravenous glucose tolerance test (IvGTT) and oral glucose tolerance test (OGTT) were performed 8-65 d apart. Hemoglobin A1c, plasma glucose as well as serum insulin and C-peptide were determined at fasting and during IvGTT and OGTT.

RESULTS: All children aged median 5.1 (4.0-9.2) yr had autoantibodies to two to six of the beta-cell antigens GAD65, insulin, IA-2, and the three amino acid position 325 variants of the ZnT8 transporter. In total, 20/47 children showed impaired glucose metabolism. Decreased (≤ 30 μU/mL insulin) first-phase insulin response (FPIR) was found in 14/20 children while 11/20 had impaired glucose tolerance in the OGTT. Five children had both impaired glucose tolerance and FPIR ≤ 30 μU/mL insulin. Number and levels of autoantibodies were not associated with glucose metabolism, except for an increased frequency (p = 0.03) and level (p = 0.01) of ZnT8QA in children with impaired glucose metabolism. Among the children with impaired glucose metabolism, 13/20 had HLA-DQ2/8, compared to 9/27 of the children with normal glucose metabolism (p = 0.03).

CONCLUSION: Secondary prevention studies in children with islet autoantibodies are complicated by variability in baseline glucose metabolism. Evaluation of metabolic control with both IvGTT and OGTT is critical and should be taken into account before randomization. All currently available autoantibody tests should be analyzed, including ZnT8QA.

Place, publisher, year, edition, pages
2013. Vol. 14, no 5, 341-349 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-223013DOI: 10.1111/pedi.12023PubMedID: 23469940OAI: oai:DiVA.org:uu-223013DiVA: diva2:712679
Available from: 2014-04-16 Created: 2014-04-16 Last updated: 2014-04-16Bibliographically approved

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