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:
影响因子:
--
通讯作者:
Kaye J
中科院分区:
文献类型:
--
作者:
Aliahmad P;O'Flaherty E;Han P;Goularte OD;Wilkinson B;Satake M;Molkentin JD;Kaye J
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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