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CUTTING EDGE |
Division of Developmental Immunology, La Jolla Institute for Allergy and Immunology, San Diego, CA 92121
Transfer of CD4+CD45RBhigh T cells into RAG–/– mice causes colitis, which can be prevented by CD4+CD25+ regulatory T cells (Treg). Colitis induction by CD4+CD45RBhigh T cells requires 
7 integrin-dependant intestinal localization, but the importance of 7 integrins for Treg function is unknown. In this study, we show that 7–/– Treg were effective in preventing colitis. Treg expanded in vivo to the same extent as CD4+CD45RBhigh T cells after transfer and they did not inhibit CD4+CD45RBhigh T cell expansion in lymphoid tissues, although they prevented the accumulation of Th1 effector cells in the intestine. 7–/– Treg were significantly reduced in the large intestine, however, compared with wild-type Treg, and regulatory activity could not be recovered from the intestine of recipients of 7–/– Treg. These data demonstrate that Treg can prevent colitis by inhibiting the accumulation of tissue-seeking effector cells and that Treg accumulation in the intestine is dispensable for colitis suppression.
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