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Regulatory CD25(+)CD4(+) T cells are considered as important players in T cell homeostasis and self-tolerance. Here we report that the integrin alpha(E)beta(7), which recognizes epithelial cadherin, identifies the most potent subpopulation of regulatory CD25(+) T cells. Strikingly, CD25-negative alpha(E)+CD4(+) T cells displayed regulatory activity. Both alpha(E)+ subsets, CD25(+) and CD25(-), express CTLA-4, suppress T cell proliferation in vitro, and protect mice from colitis in the severe combined immunodeficient model (SCID) in vivo. Whereas alpha(E)+CD25(+) T cells produce almost no cytokines, alpha(E)+CD25(-) T cells represent a unique subset in which high IL-2, IFN-gamma and T helper 2-cytokine production is linked with suppressive function. Thus, the integrin alpha(E)beta(7) can be regarded as a novel marker for subsets of highly potent, functionally distinct regulatory T cells specialized for crosstalk with epithelial environments.

Expression of the integrin αEβ7identifies unique subsets of CD25+as well as CD25−regulatory T cells

Expression of the integrin α_Eβ₇identifies unique subsets of CD25⁺as well as CD25⁻regulatory T cells