Tenuous paths in unexplored territory: From T cell receptor signaling to effector gene expression during thymocyte selection.

Tenuous paths in unexplored territory: From T cell receptor signaling to effector gene expression during thymocyte selection.
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DOI:
10.1016/j.smim.2010.04.013
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发表时间:
2010-10
影响因子:
7.8
通讯作者:
Bosselut R
Bosselut R
中科院分区:
医学2区
文献类型:
--
作者:
Wang L;Xiong Y;Bosselut R

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在αβ T细胞发育的最后一步,根据其TCR反应性,选择编码TCR链的重排基因表达CD4和CD8辅助受体的胸腺细胞逃避程序性细胞死亡,成为成熟的CD4或CD8 T细胞。这一过程是由胸腺内TCR信号触发的,该信号激活了在DP胸腺细胞中“组成性”表达的“传感器”转录因子。最终,tcr信号胸腺细胞进化出有效的转录回路,控制基础代谢、迁移、存活和谱系特异性基因表达的启动。这篇综述探讨了“感应”转录装置的组成部分如何响应正选择信号,并强调了与成熟T细胞反应的重要差异。在第二部分,我们评估当前的观察和假设之间的连接感应转录因子和效应电路。
During the last step of αβ T cell development, thymocytes that have rearranged genes encoding TCR chains and express CD4 and CD8 coreceptor are selected on the basis of their TCR reactivity to escape programmed cell death and become mature CD4 or CD8 T cells. This process is triggered by intrathymic TCR signaling, that activates ‘sensor’ transcription factors ‘constitutively’ expressed in DP thymocytes. Eventually, TCR-signaled thymocytes evolve effector transcriptional circuits that control basal metabolism, migration, survival and initiation of lineage-specific gene expression. This review examines how components of the ‘sensing’ transcription apparatus responds to positive selection signals and highlights important differences with mature T cell responses. In a second part, we evaluate current observations and hypotheses on the connections between sensing transcription factors and effector circuitries.
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