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Department of Dermatology, University Hospital of Erlangen, 91052 Erlangen, Germany

Address correspondence to Gerold Schuler, Dept. of Dermatology, University Hospital of Erlangen-Nuremberg Hartmannstrasse 14, 91052 Erlangen, Germany. Phone: 49-9131-85-1006; Fax: 49-9131-85-6175; E-mail: schuler{at}derma.imed.uni-erlangen.de

It has been recently demonstrated that regulatory CD4⁺CD25⁺ CD45RO⁺ T cells are present in the peripheral blood of healthy adults and exert regulatory function similar to their rodent counterparts. It remains difficult to understand how the small fraction of these T cells that regulate via direct cell-to-cell contact and not via secretion of immunosuppressive cytokines could mediate strong immune suppression. Here we show that human CD4⁺CD25⁺ T cells induce long-lasting anergy and production of interleukin (IL)-10 in CD4⁺CD25^- T cells. These anergized CD4⁺CD25^- T cells then suppress proliferation of syngenic CD4⁺ T cells via IL-10 but independent of direct cell contact, similar to the so-called type 1 regulatory T (Tr1) cells. This ‘catalytic’ function of CD4⁺CD25⁺ T cells to induce Tr1-like cells helps to explain their central role for the maintenance of immune homeostasis.

Key Words: regulatory T cells • human • immune tolerance • anergy • IL-10

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