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International Immunology, Vol. 12, No. 8, 1145-1155, August 2000
© 2000 Japanese Society for Immunology

Naturally anergic and suppressive CD25+CD4+ T cells as a functionally and phenotypically distinct immunoregulatory T cell subpopulation

Yuhshi Kuniyasu1,2, Takeshi Takahashi1,3, Misako Itoh1, Jun Shimizu1, Gotaroh Toda2 and Shimon Sakaguchi1,3

1 Department of Immunopathology, Tokyo Metropolitan Institute of Gerontology, Tokyo 173-0015, Japan
2 Department of Medicine, Jikei Medical University, Tokyo 305-0006, Japan
3 Department of Experimental Pathology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan

Correspondence to: S Sakaguchi

A CD4+ T cell subpopulation defined by the expression levels of a particular cell surface molecule (e.g. CD5, CD45RB, CD25, CD62L or CD38) bears an autoimmune-preventive activity in various animal models. Here we show that the expression of CD25 is highly specific, when compared with other molecules, in delineating the autoimmune-preventive immunoregulatory CD4+ T cell population. Furthermore, although CD25 is an activation marker for T cells, the following findings indicate that immunoregulatory CD25+CD4+ T cells are functionally distinct from activated or anergy-induced T cells derived from CD25CD4+ T cells. First, the former are autoimmune-preventive in vivo, naturally unresponsive (anergic) to TCR stimulation in vitro and, upon TCR stimulation, able to suppress the activation/proliferation of other T cells, whereas the latter scarcely exhibit the in vivo autoimmune-preventive activity or the in vitro suppressive activity. Second, such activated or anergy-induced CD25 spleen cells produce various autoimmune diseases when transferred to syngeneic athymic nude mice, whereas similarly treated normal spleen cells, which include CD25+CD4+ T cells, do not. Third, upon polyclonal T cell stimulation, CD25+CD4+ T cells express CD25 at higher levels and more persistently than CD25CD4+ T cell-derived activated T cells; moreover, when the stimulation is ceased, the former revert to the original levels of CD25 expression, whereas the latter lose the expression. These results collectively indicate that naturally anergic and suppressive CD25+CD4+ T cells present in normal naive mice are functionally and phenotypically stable, distinct from other T cells, and play a key role in maintaining immunologic self-tolerance.

Keywords: anergy, autoimmune disease, immunoregulation, self-tolerance

Transmitting editor: K. Okumura


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