The transcription factor NFAT exhibits signal memory during serial T cell interactions with antigen-presenting cells.

The transcription factor NFAT exhibits signal memory during serial T cell interactions with antigen-presenting cells.
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DOI:
10.1016/j.immuni.2012.09.012
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发表时间:
2013-02-21
期刊:
影响因子:
32.4
通讯作者:
Mempel TR
Mempel TR
中科院分区:
医学1区
文献类型:
--
作者:
Marangoni F;Murooka TT;Manzo T;Kim EY;Carrizosa E;Elpek NM;Mempel TR

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与抗原呈递细胞(APC)的相互作用中断了T细胞通过组织的迁移,并触发了聚集在转录调节因子(包括控制T细胞功能和分化的NFAT)的激活上的信号传导途径。在体内已经观察到同源T细胞-APC相互作用的稳定和不稳定模式,但是不稳定的连续接触的功能意义仍然不清楚。在这里,我们使用多光子活体显微镜在淋巴结和肿瘤中显示,在T细胞中,NFAT核输入快(t1/2 max~ 1 min),核输出慢(t1/2~ 20 min)。在延迟输出期间,核NFAT构成瞬时TCR信号的短期印记,并且对于T细胞耐受基因Egr 2保持转录活性,但对于效应基因Ifng则不保持转录活性,其需要持续的TCR触发以进行表达。这为观察到不稳定APC相互作用的优势与T细胞耐受的诱导相关提供了潜在的机制基础。
Interactions with antigen-presenting cells (APCs) interrupt T cell migration through tissues and trigger signaling pathways that converge on the activation of transcriptional regulators, including NFAT, which control T cell function and differentiation. Both stable and unstable modes of cognate T cell-APC interactions have been observed in vivo, but the functional significance of unstable, serial contacts has remained unclear. Here we used multiphoton intravital microscopy in lymph nodes and tumors to show that while NFAT nuclear import was fast (t1/2 max~1min), nuclear export was slow (t1/2~20min) in T cells. During delayed export, nuclear NFAT constituted a short-term imprint of transient TCR signals and remained transcriptionally active for the T cell tolerance gene Egr2, but not for the effector gene Ifng, which required continuous TCR triggering for expression. This provides a potential mechanistic basis for the observation that a predominance of unstable APC interactions correlates with the induction of T cell tolerance.
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