Regulation of diabetes development by regulatory T cells in pancreatic islet antigen-specific TCR transgenic nonobese diabetic mice - PubMed (original) (raw)
Regulation of diabetes development by regulatory T cells in pancreatic islet antigen-specific TCR transgenic nonobese diabetic mice
Osami Kanagawa et al. J Immunol. 2002.
Abstract
Nonobese diabetic (NOD) mice carrying a transgenic TCR from an islet Ag-specific CD4 T cell clone, BDC2.5, do not develop diabetes. In contrast, the same transgenic NOD mice on the SCID background develop diabetes within 4 wk after birth. Using a newly developed mAb specific for the BDC2.5 TCR, we examined the interaction between diabetogenic T cells and regulatory T cells in NOD.BDC transgenic mice. CD4 T cells from NOD.BDC mice, expressing high levels of the clonotype, transfer diabetes to NOD.SCID recipients. In contrast, CD4 T cells expressing low levels due to the expression of both transgenic and endogenous TCR alpha-chains inhibit diabetes transfer. The clonotype-low CD4 T cells appear late in the ontogeny in the thymus and peripheral lymphoid organs, coinciding with resistance to cyclophosphamide-induced diabetes. These results demonstrate that diabetic processes in NOD.BDC mice are regulated by a balance between diabetogenic T cells and regulatory T cells. In the absence of specific manipulation, regulatory T cell function seems to be dominant and mice remain diabetes free. Understanding of mechanisms by which regulatory T cells inhibit diabetogenic processes would provide means to prevent diabetes development in high-risk human populations.
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