Acceleration of spontaneous diabetes in TCR-beta-transgenic nonobese diabetic mice by beta-cell cytotoxic CD8+ T cells expressing identical endogenous TCR-alpha chains - PubMed (original) (raw)
. 1996 Nov 15;157(10):4726-35.
Affiliations
- PMID: 8906855
Acceleration of spontaneous diabetes in TCR-beta-transgenic nonobese diabetic mice by beta-cell cytotoxic CD8+ T cells expressing identical endogenous TCR-alpha chains
J Verdaguer et al. J Immunol. 1996.
Abstract
The role of target cell autoantigens and their repertoire vs those of foreign Ags, superantigens, or non-Ag-specific stimuli in the activation and recruitment of effector T cells in most spontaneous models of autoimmune diseases remains elusive. Here we report on the use of single TCR-beta transgenic mice to study the mechanisms that drive the accumulation of pathogenic T cells in the pancreatic islets of nonobese diabetic (NOD) mice, a model for insulin-dependent diabetes mellitus. Expression of the V(beta)8.1+ TCR-beta rearrangement of a diabetogenic H-2Kd-restricted beta cell cytotoxic CD8+ T cell (beta-CTL) clone in NOD mice caused a 10-fold increase in the peripheral precursor frequency of beta-CTL and a selective acceleration of the recruitment of CD8+ T cells to the pancreatic islets of prediabetic animals. This resulted in an earlier onset and a faster progression of beta cell depletion, and led to a dramatic acceleration of the onset of diabetes. Most islet-derived beta-CTL from diabetic transgenic NOD mice expressed an endogenously-derived TCR-alpha sequence identical to that of the clonotype donating the TCR-beta transgene, and a TCR-alpha-CDR3 sequence homologous to those expressed by most islet-derived beta-CTL from nontransgenic NOD mice. TCR-beta transgene expression did not change the peripheral frequency of beta cell-specific CD4+ T cells, the rate at which these cells accumulated in the pancreatic islets, or the incidence of diabetes. Taken together, our data indicate that retention of CD8+ and CD4+ T cells in the pancreatic islets of NOD mice is driven by beta cell autoantigens, rather than by local superantigens or non-Ag-specific stimuli, and that beta-CTL are major effectors of beta cell damage in spontaneous insulin-dependent diabetes mellitus.
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