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GAD65-Reactive T cells in a non-diabetic stiff-man syndrome patient.

Abstract：

:GAD65 (glutamic acid decarboxylase) is an important autoantigen in both type 1 (insulin-dependent) diabetes mellitus (IDDM) and the neurological autoimmune disease stiff-man syndrome (SMS), and is expressed in pancreatic islets as well as the nervous system. Still, only 30% of SMS patients also have type 1 diabetes. To study regulation of T cell responsiveness to GAD65, we investigated a non-diabetic SMS patient with HLA-DR3/7 (predisposing to type 1 diabetes) and high levels of type 1 diabetes-associated autoantibodies against GAD65 and islet cells, and compared the results with those of her diabetic son and two other SMS patients. T cell responses to GAD65 were repeatedly absent in primary stimulation, whereas IA-2, islet antigen and tetanus toxoid induced significant T cell proliferation. However, after in vitro restimulation, GAD65 reactive T cell lines and clones were obtained that were HLA-DR3 restricted, and cross-reactive with a homogenate of purified human pancreatic islets. These T cells produced the immunoregulatory cytokine IL-10 in combination with IFN-gamma and IL-4 (Th0). The dominant T cell epitope was mapped to the central region of GAD65. Although no primary response to whole GAD65 was detectable, the naturally processed GAD65 peptide epitope was recognized vigorously in the primary stimulation assay. The lack of detectable primary T cell responses to GAD65, together with the GAD65-specific cytokine production of restimulated T cells, suggest that GAD65-specific cellular autoimmunity in this patient is suppressed and may be related to the absence of diabetes despite humoral autoreactivity and genetic predisposition.

journal_name

J Autoimmun

journal_title

Journal of autoimmunity

authors

Schloot NC,Batstra MC,Duinkerken G,De Vries RR,Dyrberg T,Chaudhuri A,Behan PO,Roep BO

doi

10.1006/jaut.1999.0280

subject

Has Abstract

pub_date

1999-06-01 00:00:00

pages

289-96

issue

4

eissn

0896-8411

issn

1095-9157

pii

S0896-8411(99)90280-9

journal_volume

12

pub_type

杂志文章

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