Immunologic tolerance maintained by CD25<sup>+</sup> CD4<sup>+</sup> regulatory T cells: their common role in controlling autoimmunity, tumor immunity, and transplantation tolerance

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<jats:p><jats:bold>Summary:</jats:bold> There is accumulating evidence that T‐cell‐mediated dominant control of self‐reactive T‐cells contributes to the maintenance of immunologic self‐tolerance and its alteration can cause autoimmune disease. Efforts to delineate such a regulatory T‐cell population have revealed that CD25<jats:sup>+</jats:sup> cells in the CD4<jats:sup>+</jats:sup> population in normal naive animals bear the ability to prevent autoimmune disease <jats:italic>in vivo</jats:italic> and, upon antigenic stimulation, suppress the activation/proliferation of other T cells <jats:italic>in vitro</jats:italic>. The CD25<jats:sup>+</jats:sup> CD4<jats:sup>+</jats:sup> regulatory T cells, which are naturally anergic and suppressive, appear to be produced by the normal thymus as a functionally distinct subpopulation of T cells. They play critical roles not only in preventing autoimmunity but also in controlling tumor immunity and transplantation tolerance.</jats:p>

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