Tonic LAT-HDAC7 Signals Sustain Nur77 and Irf4 Expression to Tune Naive CD4 T Cells.

Tonic LAT-HDAC7 Signals Sustain Nur77 and Irf4 Expression to Tune Naive CD4 T Cells.
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DOI:
10.1016/j.celrep.2017.04.076
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发表时间:
2017-05-23
期刊:
影响因子:
8.8
通讯作者:
Roose JP
Roose JP
中科院分区:
生物学1区
文献类型:
--
作者:
Myers DR;Lau T;Markegard E;Lim HW;Kasler H;Zhu M;Barczak A;Huizar JP;Zikherman J;Erle DJ;Zhang W;Verdin E;Roose JP

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CD 4 + T细胞在来自T细胞受体(TCR)、细胞因子和谱系特异性转录因子的协同信号的作用下以前馈方式分化成T辅助细胞亚群。幼稚的CD 4 + T细胞避免自发参与前馈机制,但保持准备状态。缺乏接头分子LAT的T细胞表现出受损的TCR诱导信号,但在小鼠中引起自发性淋巴增生性T辅助2(TH 2)细胞综合征。因此,LAT构成了一个无法解释的维持线索。在这里,我们证明了通过LAT的紧张性信号组成性地从CD 4 + T细胞的细胞核输出阻遏物HDAC 7。没有这样的紧张信号,HDAC 7靶基因Nur 77和Irf 4被抑制。我们发现Nur 77抑制CD 4 + T细胞增殖,并揭示了Irf 4在TH 2极化中的抑制作用; Irf 4基因剂量减半导致GATA 3+和IL 4+细胞增加。我们的研究表明,幼稚的CD 4 + T细胞是由紧张性LAT-HDAC 7信号动态调节的。
CD4+ T cells differentiate into T helper cell subsets in feed-forward manners with synergistic signals from the T cell receptor (TCR), cytokines, and lineage-specific transcription factors. Naïve CD4+ T cells avoid spontaneous engagement of feed-forward mechanisms but retain a prepared state. T cells lacking the adapter molecule LAT demonstrate impaired TCR-induced signals yet cause a spontaneous lymphoproliferative T helper 2 (TH2) cell syndrome in mice. Thus, LAT constitutes an unexplained maintenance cue. Here we demonstrate that tonic signals through LAT constitutively export the repressor HDAC7 from the nucleus of CD4+ T cells. Without such tonic signals, HDAC7 target genes Nur77 and Irf4 are repressed. We reveal that Nur77 suppresses CD4+ T cell proliferation and uncover a suppressive role for Irf4 in TH2 polarization; halving Irf4 gene-dosage leads to increases in GATA3+ and IL4+ cells. Our studies reveal that naïve CD4+ T cells are dynamically tuned by tonic LAT-HDAC7 signals.
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