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* Benaroya Research Institute, Virginia Mason, Seattle, WA 98101;
Department of Medicine, Laboratory Medicine, and Pathobiology, University of Washington, Seattle, WA 98195; and
Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109
The presence of autoreactive CD4+ T cells in the peripheral blood of healthy human subjects was investigated after removal of CD4+CD25+ regulatory T cells (Treg). CD4+ T cells that were directed against the type 1 diabetes-associated autoantigen glutamic acid decarboxylase 65, the melanocyte differentiation Ag tyrosinase, and the cancer/testis tumor Ag NY-ESO-1 were readily derived from PBMC of healthy individuals. These autoreactive T cells could be visualized, using Ag-specific class II tetramer reagents, in the peripheral blood of most individuals examined. Addition of CD4+CD25+ Treg back to the CD4+CD25– population suppressed the expansion of the autoreactive T cells. Autoreactive T cells were cloned based on tetramer binding, and expressed characteristic activation markers upon self-Ag stimulation. These results show that autoreactive T cells are present in most healthy individuals and that Treg likely play an important role of keeping these autoreactive T cells in check.
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