T Cell Receptor-Regulated TGF-β Type I Receptor Expression Determines T Cell Quiescence and Activation.

T Cell Receptor-Regulated TGF-β Type I Receptor Expression Determines T Cell Quiescence and Activation.
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DOI:
10.1016/j.immuni.2018.03.025
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发表时间:
2018-04-17
期刊:
影响因子:
32.4
通讯作者:
Chen W
Chen W
中科院分区:
医学1区
文献类型:
--
作者:
Tu E;Chia CPZ;Chen W;Zhang D;Park SA;Jin W;Wang D;Alegre ML;Zhang YE;Sun L;Chen W

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目前尚不清楚幼稚 T 细胞是如何强制静止的,但尽管存在抑制信号,但外来抗原和自身抗原的激活是允许的。我们发现,幼稚 T 细胞中存在活性转化生长因子-β (TGFβ) 信号传导,并且 T 细胞受体 (TCR) 参与通过激活含半胱天冬酶募集结构域的蛋白 11 (CARD11) 和活化 B 细胞的核因子 kappa 轻链增强子 (NFκB) 下调 TGFβ 1 型受体 (TβRI),从而减少 T 细胞激活过程中的 TGFβ 信号传导。 TGFβ 可阻止 TCR 介导的 TβRI 下调,但可被白细胞介素 6 (IL-6) 消除。通过在幼稚和活化的 T 细胞中过度表达 TβRI,减轻 TCR 介导的 TβRI 下调,使 T 细胞反应性降低并抑制自身免疫。与健康受试者相比,自身免疫患者的初始 T 细胞表现出 TβRI 表达减少和 TCR 驱动的增殖增加。因此,TCR 介导的 TβRI-TGFβ 信号传导调节是决定 T 细胞静止和激活的关键标准。目前还不清楚幼稚 T 细胞是如何实现静止的。图等人。显示 TGFβ 信号传导维持 T 细胞静止,防止对自身抗原的异常反应。强烈的 TCR 刺激会降低 TβRI 的表达,从而消除 T 细胞中的 TGFβ 信号传导。 TCR介导的TβRI下调是除“双信号”模型之外完全激活T细胞的“第三个标准”。
It is unclear how quiescence is enforced in naïve T cells, but activation by foreign antigens and self-antigens is allowed, despite the presence of inhibitory signals. We showed that active transforming growth factor-beta (TGFβ) signaling was present in naïve T cells and T cell receptor (TCR) engagement reduced TGFβ signaling during T cell activation by downregulating TGFβ type 1 receptor (TβRI) through activation of caspase recruitment domain-containing protein 11 (CARD11) and nuclear factor kappa-light-chain-enhancer of activated B cells (NFκB). TGFβ prevented TCR-mediated TβRI downregulation but this was abrogated by interleukin-6 (IL-6). Mitigation of TCR-mediated TβRI downregulation through overexpression of TβRI in naïve and activated T cells rendered T cells less responsive and suppressed autoimmunity. Naïve T cells in autoimmune patients exhibited reduced TβRI expression and increased TCR-driven proliferation compared to healthy subjects. Thus, TCR-mediated regulation of TβRI-TGFβ signaling acts as a crucial criterion to determine T cell quiescence and activation. It is unclear how quiescence is enforced in naïve T cells. Tu et al. show that TGFβ signaling maintains T cell quiescence, preventing aberrant responses to self-antigens. Strong TCR stimuli reduce TβRI expression and consequently abolish TGFβ signaling in T cells. TCR-mediated TβRI downregulation acts as a “third criterion” to fully activate T cells in addition to the “two-signal” model.
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