Quantitative and temporal requirements revealed for Zap70 catalytic activity during T cell development.

Quantitative and temporal requirements revealed for Zap70 catalytic activity during T cell development.
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DOI:
10.1038/ni.2918
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发表时间:
2014-07
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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Zap-70的催化活性对于T细胞受体(TCR)信号传导是至关重要的,但其在胸腺细胞发育中的功能的定量和时间要求尚不清楚。在同步胸腺选择模型中,使用化学遗传系统选择性和可逆地抑制Zap-70催化活性,我们发现,CD 4 + CD 8+胸腺细胞在超过36小时的时间内整合多种瞬时Zap-70依赖性信号,以达到阳性选择的累积阈值,而1小时的信号传导足以进行阴性选择。Zap-70活性的滴定导致阳性和阴性选择的分级降低,但不降低由阳性选择的OT-I细胞整合的累积TCR信号,揭示了异质性,甚至在经历阳性选择的表达相同TCR的CD 4 + CD 8+胸腺细胞中也是如此。
The catalytic activity of Zap-70 is crucial for T cell receptor (TCR) signaling, but the quantitative and temporal requirements for its function in thymocyte development are not known. Using a chemical-genetic system to selectively and reversibly inhibit Zap-70 catalytic activity in a model of synchronized thymic selection, we showed that CD4+CD8+ thymocytes integrate multiple, transient, Zap-70-dependent signals over more than 36 h to reach a cumulative threshold for positive selection, whereas one hour of signaling was sufficient for negative selection. Titration of Zap-70 activity resulted in graded reductions in positive and negative selection but did not decrease the cumulative TCR signals integrated by positively selected OT-I cells, revealing heterogeneity, even among CD4+CD8+ thymocytes expressing identical TCRs undergoing positive selection.
ZAP-70 的亚等位基因揭示了自身免疫性疾病与自身免疫反应性的不同胸腺阈值。
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