Nuclear pore complex-mediated modulation of TCR signaling is required for naïve CD4(+) T cell homeostasis.

Nuclear pore complex-mediated modulation of TCR signaling is required for naïve CD4(+) T cell homeostasis.
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DOI:
10.1038/s41590-018-0103-5
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发表时间:
2018-06
期刊:
影响因子:
30.5
通讯作者:
D'Angelo MA
D'Angelo MA
中科院分区:
医学1区
文献类型:
--
作者:
Borlido J;Sakuma S;Raices M;Carrette F;Tinoco R;Bradley LM;D'Angelo MA

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核孔复合体(Nuclear pore complex,NPC)是连接细胞核和细胞质的通道。我们报告,组织特异性NPC成分Nup 210的缺失导致幼稚CD 4 + T细胞的严重缺陷。Nup 210缺陷型CD 4 + T淋巴细胞正常发育,但不能在外周存活。存活率下降是由于传递紧张性TCR信号的能力受损和Fas水平升高所致,这使Nup 210 −/−幼稚CD 4 + T细胞对Fas介导的细胞死亡敏感。从机制上讲,Nup 210通过调节细胞核周边的Caveolin-2(Cav 2)和cJun的表达来调节这些过程。虽然Cav 2的TCR依赖性和CD 4 + T细胞特异性上调对于近端TCR信号传导至关重要,但Fas的STAT 3依赖性抑制需要cJun表达。我们的研究结果揭示了Nup 210作为TCR信号传导和T细胞稳态的细胞内在调节剂的意想不到的作用;并暴露了NPC作为适应性免疫系统中的关键参与者。
Nuclear pore complexes (NPCs) are channels connecting the nucleus with the cytoplasm. We report that loss of the tissue-specific NPC component Nup210 causes a severe deficit of naïve CD4+ T cells. Nup210-deficient CD4+ T lymphocytes develop normally but fail to survive in the periphery. The decreased survival results from both an impaired ability to transmit tonic TCR signals and increased levels of Fas, which sensitize Nup210−/− naïve CD4+ T cells to Fas-mediated cell death. Mechanistically, Nup210 regulates these processes by modulating the expression of Caveolin-2 (Cav2) and cJun at the nuclear periphery. While the TCR-dependent and CD4+ T cell-specific upregulation of Cav2 is critical for proximal TCR signaling, cJun expression is required for STAT3-dependent repression of Fas. Our results uncover an unexpected role for Nup210 as a cell-intrinsic regulator of TCR signaling and T cell homeostasis; and expose NPCs as key players in the adaptive immune system.
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