Selective autophagy of the adaptor protein Bcl10 modulates T cell receptor activation of NF-κB.

Selective autophagy of the adaptor protein Bcl10 modulates T cell receptor activation of NF-κB.
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DOI:
10.1016/j.immuni.2012.04.008
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发表时间:
2012-06-29
期刊:
影响因子:
32.4
通讯作者:
Schaefer BC
Schaefer BC
中科院分区:
医学1区
文献类型:
--
作者:
Paul S;Kashyap AK;Jia W;He YW;Schaefer BC

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衔接蛋白Bcl 10是T细胞受体(TCR)-至-NF-κB信号传导的至关重要的介质。Bcl 10降解是一种知之甚少的生物学现象,被认为可降低NF-κB的TCR活化。在这里,我们已经表明,TCR接合触发了原代效应T细胞中Bcl 10的降解,但在幼稚T细胞中则不然。TCR结合促进了Bcl 10的K63-聚泛素化,导致Bcl 10与自噬适配器p62相关联。巧合的是,Bcl 10与NF-κB的信号传导和Bcl 10通过自噬的逐渐降解都需要p62结合。Bcl 10自噬具有高度选择性,因为它使Bcl 10的直接结合伴侣Malt 1幸免。阻断Bcl 10自噬可增强TCR对NF-κB的活化。总之,这些数据表明,Bcl 10的选择性自噬是一种调节效应T细胞中TCR信号传导至NF-κB的途径-内在稳态机制。这种稳态过程可以保护T细胞免受不受限制的NF-κB活化的不利后果,如细胞衰老。
The adaptor protein Bcl10 is a critically important mediator of T cell receptor (TCR)-to-NF-κB signaling. Bcl10 degradation is a poorly understood biological phenomenon suggested to reduce TCR activation of NF-κB. Here we have shown that TCR engagement triggers the degradation of Bcl10 in primary effector T cells, but not in naïve T cells. TCR engagement promoted K63-polyubiquitination of Bcl10, causing Bcl10 association with the autophagy adaptor, p62. Paradoxically, p62 binding was required for both Bcl10 signaling to NF-κB and gradual degradation of Bcl10 by autophagy. Bcl10 autophagy was highly selective, as it spared Malt1, a direct Bcl10 binding partner. Blockade of Bcl10 autophagy enhanced TCR activation of NF-κB. Together, these data demonstrate that selective autophagy of Bcl10 is a pathway-intrinsic homeostatic mechanism that modulates TCR signaling to NF-κB in effector T cells. This homeostatic process may protect T cells from adverse consequences of unrestrained NF-κB activation, such as cellular senescence.
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