Abstract:
OBJECTIVE:To investigate the prevalence of beta-cell autoantigen-reactive peripheral T-cells in type 1 diabetes, we developed an immunoglobulin-free enzyme-linked immunospot (ELISPOT) assay and assessed its usefulness for diagnosing this disease. RESEARCH DESIGN AND METHODS:Cellular immune responses to beta -cell autoantigens were studied both by immunoglobulin-free proliferation assays and ELISPOT assays in 33 patients with type 1 diabetes and 15 patients with type 2 diabetes, compared with 23 healthy control subjects. Autoantibodies against GAD65 and IA-2 were measured by radioimmunoassay. RESULTS:Significant proliferative responses to GAD65 were observed in 10 of 31 (32.3%) type 1 diabetic patients (P < 0.05), whereas GAD65-reactive gamma-interferon (IFN-gamma)-secreting cells were detected in 22 of 33 patients (66.7%) by ELISPOT assay (P < 0.001). Of patients negative for both GAD65 and IA-2, five of six (83.3%) showed IFN-gamma positivity in ELISPOT and two of five (40.0%) showed significant proliferation against GAD65. CONCLUSIONS:Using a newly developed ELISPOT assay, GAD-reactive T-helper 1 cells in PBMC of type 1 diabetic patients could be identified at a higher frequency than by the proliferation assay. Therefore, the immunoglobulin-free ELISPOT assay is an excellent tool for detecting T-cell reactivity to autoantigens with greater specificity and, in combination with beta-cell autoantibody determination, will improve the diagnosis of type 1 diabetes.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Kotani R,Nagata M,Moriyama H,Nakayama M,Yamada K,Chowdhury SA,Chakrabarty S,Jin Z,Yasuda H,Yokono Kdoi
10.2337/diacare.25.8.1390subject
Has Abstractpub_date
2002-08-01 00:00:00pages
1390-7issue
8eissn
0149-5992issn
1935-5548journal_volume
25pub_type
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