Journal
NATURE IMMUNOLOGY
Volume 3, Issue 12, Pages 1208-1213Publisher
NATURE AMERICA INC
DOI: 10.1038/ni853
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Alloreactive CD8(+) T cells may persist in animals made tolerant of transplanted tissues; their function is controlled through continuous censorship by regulatory CD4(+) T cells. We sought to establish the stage at which such censorship operates. We found that monospecific CD8(+) T cells introduced into tolerant animals responded to the tolerated tissue antigen as if they had received CD4(+) T cell help: they proliferated and accumulated normally. However, they did show compromised graft rejection, interferon-gamma production and cell-mediated cytotoxicity. These findings suggest that tolerance mediated by regulatory T cells acts by censoring immune effector functions rather than by limiting the induction of T cell responses.
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