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CD4+CD25+ regulatory T cells inhibit natural killer cell functions in a transforming growth factor-beta-dependent manner.

Abstract : Tumor growth promotes the expansion of CD4+CD25+ regulatory T (T reg) cells that counteract T cell-mediated immune responses. An inverse correlation between natural killer (NK) cell activation and T reg cell expansion in tumor-bearing patients, shown here, prompted us to address the role of T reg cells in controlling innate antitumor immunity. Our experiments indicate that human T reg cells expressed membrane-bound transforming growth factor (TGF)-beta, which directly inhibited NK cell effector functions and down-regulated NKG2D receptors on the NK cell surface. Adoptive transfer of wild-type T reg cells but not TGF-beta-/- T reg cells into nude mice suppressed NK cell-mediated cytotoxicity, reduced NKG2D receptor expression, and accelerated the growth of tumors that are normally controlled by NK cells. Conversely, the depletion of mouse T reg cells exacerbated NK cell proliferation and cytotoxicity in vivo. Human NK cell-mediated tumor recognition could also be restored by depletion of T reg cells from tumor-infiltrating lymphocytes. These findings support a role for T reg cells in blunting the NK cell arm of the innate immune system.
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Submitted on : Tuesday, July 31, 2007 - 3:11:56 PM
Last modification on : Friday, October 23, 2020 - 4:49:41 PM
Long-term archiving on: : Monday, September 17, 2012 - 12:25:43 PM

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François Ghiringhelli, Cédric Ménard, Magali Terme, Caroline Flament, Julien Taieb, et al.. CD4+CD25+ regulatory T cells inhibit natural killer cell functions in a transforming growth factor-beta-dependent manner.. The Journal of Experimental Medecine, The Rockefeller University Press, 2007, 202 (8), pp.1075-85. ⟨10.1084/jem.20051511⟩. ⟨pasteur-00020140⟩

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