IL-2-dependent tuning of NK cell sensitivity for target cells is controlled by regulatory T cells.

IL-2-dependent tuning of NK cell sensitivity for target cells is controlled by regulatory T cells.
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DOI:
10.1084/jem.20122462
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发表时间:
2013-06-03
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Rudensky AY
Rudensky AY
中科院分区:
其他
文献类型:
--
作者:
Gasteiger G;Hemmers S;Firth MA;Le Floc'h A;Huse M;Sun JC;Rudensky AY

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IL-2依赖的先天适应性淋巴细胞串扰调节NK细胞的反应性,并受T细胞的限制。适应性免疫系统的出现以自我反应细胞介导的病理形式造成了损失。调节性T细胞(T reg细胞)在T和B淋巴细胞对自身和外来抗原的反应中起着关键的刹车作用。在这里,我们询问是否需要T reg细胞来抑制NK细胞,NK细胞是第三种淋巴细胞系,其特征结合了先天性和获得性免疫细胞的特性。尽管T-reg细胞耗尽导致全身致命性自身免疫,但NK细胞对强激活的自身和非自身配体的耐受性和反应性基本保持不变。相反,由于IL-2的高度可获得性,在没有T细胞的情况下,缺失自我的反应增加。我们发现,IL-2能迅速增强NK细胞与靶细胞的有效结合能力,并使NK细胞对弱刺激做出反应。我们的结果表明,IL-2依赖的适应性天生淋巴细胞串扰调节NK细胞的反应性,而T细胞通过限制IL-2的可获得性来抑制NK细胞的细胞毒作用。
IL-2–dependent adaptive-innate lymphocyte cross talk tunes NK cell reactivity and is limited by T reg cells. The emergence of the adaptive immune system took a toll in the form of pathologies mediated by self-reactive cells. Regulatory T cells (T reg cells) exert a critical brake on responses of T and B lymphocytes to self- and foreign antigens. Here, we asked whether T reg cells are required to restrain NK cells, the third lymphocyte lineage, whose features combine innate and adaptive immune cell properties. Although depletion of T reg cells led to systemic fatal autoimmunity, NK cell tolerance and reactivity to strong activating self- and non-self–ligands remained largely intact. In contrast, missing-self responses were increased in the absence of T reg cells as the result of heightened IL-2 availability. We found that IL-2 rapidly boosted the capacity of NK cells to productively engage target cells and enabled NK cell responses to weak stimulation. Our results suggest that IL-2–dependent adaptive-innate lymphocyte cross talk tunes NK cell reactivity and that T reg cells restrain NK cell cytotoxicity by limiting the availability of IL-2.
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