The Journal of Experimental Medicine
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Published online March 19, 2007
doi:10.1084/jem.20061405
The Journal of Experimental Medicine, Vol. 204, No. 4, 735-745
The Rockefeller University Press, 0022-1007 $30.00
© 2007 Schneider et al.
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ARTICLE

 CCR7 is required for the in vivo function of CD4+ CD25+ regulatory T cells

Martin A. Schneider1, Josef G. Meingassner1, Martin Lipp2, Henrietta D. Moore1, and Antal Rot1

1 Novartis Institutes for BioMedical Research, A1235 Vienna, Austria
2 Department of Molecular Tumor Genetics and Immunogenetics, Max Delbruck Center for Molecular Medicine, D13125 Berlin, Germany

CORRESPONDENCE Antal Rot: antal.rot{at}novartis.com

CCR7-mediated migration of naive T cells into the secondary lymphoid organs is a prerequisite for their encounter with mature dendritic cells, the productive presentation of cognate antigen, and consequent T cell proliferation and effector differentiation. Therefore, CCR7 was suggested to play an important role in the initiation of adaptive immune responses. In this study, we show that primary immunity can also develop in the absence of CCR7. Moreover, CCR7-deficient knockout (KO) mice display augmented immune responses. Our data cumulatively suggest that enhanced immunity in CCR7 KO mice is caused by the defective lymph node (LN) positioning of FoxP3+ CD4+ CD25+ regulatory T cells (T reg cells) and the consequent impediment of their function. The FoxP3+ T reg cells express CCR7 and, after their adoptive transfer, migrate into the LNs of wild-type mice. Here, they proliferate in situ upon antigen stimulation and inhibit the generation of antigen-specific T cells. Conversely, transferred CCR7-deficient T reg cells fail to migrate into the LNs and suppress antigen-induced T cell responses. The transfer of combinations of naive and T reg cells from wild-type and CCR7 KO mice into syngeneic severe combined immunodeficient mice directly demonstrates that CCR7-deficient T reg cells are less effective than their wild-type counterparts in preventing the development of inflammatory bowel disease.

Abbreviations used: CHS, contact hypersensitivity; IBD, inflammatory bowel disease; SLO, secondary lymphoid organ.


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