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

CD4+CD25+ regulatory T cells inhibit natural killer cell functions in a transforming growth factor-beta-dependent manner.
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CD4+ CD25+调节性T细胞以转化的生长因子β依赖性方式抑制天然杀伤细胞的功能。

DOI:
10.1084/jem.20051511
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发表时间:
2005-10-17
影响因子:
15.3
通讯作者:
Zitvogel, L
Zitvogel, L
中科院分区:
医学1区
文献类型:
--
作者:
Ghiringhelli, F;Ménard, C;Terme, M;Flament, C;Taieb, J;Chaput, N;Puig, PE;Novault, S;Escudier, B;Vivier, E;Lecesne, A;Robert, C;Blay, JY;Bernard, J;Caillat-Zucman, S;Freitas, A;Tursz, T;Wagner-Ballon, O;Capron, C;Vainchencker, W;Martin, F;Zitvogel, L

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肿瘤生长促进了CD4+CD25+调节性T(T Reg)细胞的扩张,从而抵消了T细胞介导的免疫反应。在荷瘤患者中,自然杀伤(NK)细胞激活和T-reg细胞增殖之间的负相关性促使我们研究T-reg细胞在控制先天抗肿瘤免疫中的作用。我们的实验表明,人T细胞表达膜结合的转化生长因子-β,它直接抑制NK细胞的效应功能,下调NK细胞表面的NKG2D受体。过继转移野生型T细胞而不是转化生长因子-β−/−T细胞到裸鼠体内可以抑制NK细胞介导的细胞毒作用,减少NKG2D受体的表达,加速通常由NK细胞控制的肿瘤的生长。相反,小鼠T reg细胞的耗尽在体内加剧了NK细胞的增殖和细胞毒作用。人类NK细胞介导的肿瘤识别也可以通过去除肿瘤浸润性淋巴细胞中的T reg细胞来恢复。这些发现支持T细胞在钝化先天免疫系统的NK细胞臂中的作用。
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)–β, 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-β −/− 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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