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Glutamic Acid Decarboxylase Autoantibody Detection by Electrochemiluminescence Assay Identifies Latent Autoimmune Diabetes in Adults with Poor Islet Function. | LitMetric

AI Article Synopsis

  • The study compares a new electrochemiluminescence (ECL) assay for detecting GAD65 autoantibodies with an established radiobinding assay in diagnosing latent autoimmune diabetes in adults (LADA).
  • Serum samples from 141 LADA patients, along with samples from type 1 and type 2 diabetes patients, were tested to evaluate the accuracy and effectiveness of the new ECL-GAD65 antibody assay.
  • Results showed that ECL-positive LADA patients exhibited traits similar to type 1 diabetes, such as being leaner and having poorer β-cell function, indicating that ECL can help better define LADA subtypes.

Article Abstract

Background: The detection of glutamic acid decarboxylase 65 (GAD65) autoantibodies is essential for the prediction and diagnosis of latent autoimmune diabetes in adults (LADA). The aim of the current study was to compare a newly developed electrochemiluminescence (ECL)-GAD65 antibody assay with the established radiobinding assay, and to explore whether the new assay could be used to define LADA more precisely.

Methods: Serum samples were harvested from 141 patients with LADA, 95 with type 1 diabetes mellitus, and 99 with type 2 diabetes mellitus, and tested for GAD65 autoantibodies using both the radiobinding assay and ECL assay. A glutamic acid decarboxylase antibodies (GADA) competition assay was also performed to assess antibody affinity. Furthermore, the clinical features of these patients were compared.

Results: Eighty-eight out of 141 serum samples (62.4%) from LADA patients were GAD65 antibody-positive by ECL assay. Compared with ECL-GAD65 antibody-negative patients, ECL-GAD65 antibody-positive patients were leaner (<0.0001), had poorer β-cell function (<0.05), and were more likely to have other diabetes-associated autoantibodies. The β-cell function of ECL-GAD65 antibody-positive patients was similar to that of type 1 diabetes mellitus patients, whereas ECL-GAD65 antibody-negative patients were more similar to type 2 diabetes mellitus patients.

Conclusion: Patients with ECL-GAD65 antibody-negative share a similar phenotype with type 2 diabetes mellitus patients, whereas patients with ECL-GAD65 antibody-positive resemble those with type 1 diabetes mellitus. Thus, the detection of GADA using ECL may help to identify the subtype of LADA.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7188968PMC
http://dx.doi.org/10.4093/dmj.2019.0007DOI Listing

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