TOX provides a link between calcineurin activation and CD8 lineage commitment.

TOX provides a link between calcineurin activation and CD8 lineage commitment.
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DOI:
10.1084/jem.20040051
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发表时间:
2004-04-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Kaye J
Kaye J
中科院分区:
其他
文献类型:
--
作者:
Aliahmad P;O'Flaherty E;Han P;Goularte OD;Wilkinson B;Satake M;Molkentin JD;Kaye J

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T细胞发育依赖于多种信号通路的整合,尽管已经确定了信号级联与在胸腺细胞分化中起作用的下游核因子之间的联系很少。我们发现HMG盒蛋白TOX的表达足以诱导与β选择相关的辅助受体基因表达的变化,包括CD 8基因去甲基化。TOX表达也足以在不存在MHC-TCR相互作用的情况下启动对CD 8谱系的正选择。TOX介导的阳性选择与Runx 3的上调相关,在该过程中涉及CD 4沉默。有趣的是,强T细胞受体介导的信号可以改变这种细胞的命运。我们进一步证明,TOX在双阳性胸腺细胞的上调是钙调神经磷酸酶依赖性的,连接这一关键的信号通路,在积极的选择核的变化。
T cell development is dependent on the integration of multiple signaling pathways, although few links between signaling cascades and downstream nuclear factors that play a role in thymocyte differentiation have been identified. We show here that expression of the HMG box protein TOX is sufficient to induce changes in coreceptor gene expression associated with β-selection, including CD8 gene demethylation. TOX expression is also sufficient to initiate positive selection to the CD8 lineage in the absence of MHC–TCR interactions. TOX-mediated positive selection is associated with up-regulation of Runx3, implicating CD4 silencing in the process. Interestingly, a strong T cell receptor–mediated signal can modify this cell fate. We further demonstrate that up-regulation of TOX in double positive thymocytes is calcineurin dependent, linking this critical signaling pathway to nuclear changes during positive selection.
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