Spontaneous loss of T-cell tolerance to glutamic acid decarboxylase in murine insulin-dependent diabetes

Nature. 1993 Nov 4;366(6450):69-72. doi: 10.1038/366069a0.

Abstract

Insulin-dependent diabetes mellitus (IDDM) in non-obese diabetic (NOD) mice results from the T-lymphocyte-mediated destruction of the insulin-producing pancreatic beta-cells and serves as a model for human IDDM. Whereas a number of autoantibodies are associated with IDDM, it is unclear when and to what beta-cell antigens pathogenic T cells become activated during the disease process. We report here that a T-helper-1 (Th1) response to glutamate decarboxylase develops in NOD mice at the same time as the onset of insulitis. This response is initially limited to a confined region of glutamate decarboxylase, but later spreads intramolecularly to additional determinants. Subsequently, T-cell reactivity arises to other beta-cell antigens, consistent with intermolecular diversification of the response. Prevention of the spontaneous anti-glutamate decarboxylase response, by tolerization of glutamate decarboxylase-reactive T cells, blocks the development of T-cell autoimmunity to other beta-cell antigens, as well as insulitis and diabetes. Our data suggest that (1) glutamate decarboxylase is a key target antigen in the induction of murine IDDM; (2) autoimmunity to glutamate decarboxylase triggers T-cell responses to other beta-cell antigens, and (3) spontaneous autoimmune disease can be prevented by tolerization to the initiating target antigen.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aging / immunology
  • Amino Acid Sequence
  • Animals
  • Autoantigens / immunology*
  • Diabetes Mellitus, Type 1 / immunology*
  • Diabetes Mellitus, Type 1 / pathology
  • Epitopes / immunology
  • Female
  • Glutamate Decarboxylase / immunology*
  • Immunosuppression
  • Islets of Langerhans / immunology
  • Islets of Langerhans / pathology
  • Mice
  • Mice, Inbred NOD
  • Molecular Sequence Data
  • T-Lymphocytes, Helper-Inducer / immunology*

Substances

  • Autoantigens
  • Epitopes
  • Glutamate Decarboxylase