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* Institute of Immunology,
Department of Dermatology, and
Center for Natural Sciences and Medicine, Johannes Gutenberg University, Mainz, Germany
CD25+ T regulatory (Treg) cells play a central role regarding the maintenance of peripheral tolerance via suppression of autoaggressive CD4+ T cells, CD8+ T cells, and Th1 cells. In this study we demonstrate that CD25+ Treg cells can also suppress the differentiation of murine conventional CD4+ T cells toward Th2 cells in a contact-dependent manner. However, the cytokine production and proliferation of established Th2 cells could not be inhibited by freshly isolated CD25+ Treg cells, whereas a strong inhibition of differentiated Th2 cells by in vitro preactivated CD25+ Treg cells could be observed. Inhibition of both conventional CD4+ T cells and Th2 cells is accompanied by a strong enhancement of the expression of FoxP3 in the suppressed T cells. Hence, our study indicates that CD25+ Treg cells have a therapeutic potential for Th2-mediated diseases and suggests a novel mechanism of suppression mediated by the transcriptional repressor FoxP3.
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