TGF-β cytokine signaling promotes CD8+ T cell development and low-affinity CD4+ T cell homeostasis by regulation of interleukin-7 receptor α expression.

TGF-β cytokine signaling promotes CD8+ T cell development and low-affinity CD4+ T cell homeostasis by regulation of interleukin-7 receptor α expression.
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DOI:
10.1016/j.immuni.2013.07.016
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发表时间:
2013-08-22
期刊:
影响因子:
32.4
通讯作者:
Li MO
Li MO
中科院分区:
医学1区
文献类型:
--
作者:
Ouyang W;Oh SA;Ma Q;Bivona MR;Zhu J;Li MO

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Interleukin 7 receptor α-chain (IL-7Rα) is induced upon T cell positive selection, and controls thymic CD8-lineage specification and peripheral naïve T cell homeostasis. How IL-7Rα expression is regulated in developing thymocytes is unclear. Here we showed that transforming growth factor-β (TGF-β) signaling promoted IL-7Rα expression and CD8+ T cell differentiation. In addition, TGF-β signaling was required for high IL-7Rα expression in CD4+ T cells bearing low-affinity T cell receptors, and the abrogation of TGF-β receptor expression led to failed maintenance of peripheral CD4+ T cells. Compromised IL-7Rα expression in TGF-β receptor-deficient T cells was associated with increased expression of the Il7ra transcriptional repressor, Gfi-1. IL-7Rα transgenesis or T cell-specific ablation of Gfi-1 restored IL-7Rα expression, and largely ameliorated the development and homeostasis defects of TGF-β receptor-deficient T cells. These findings reveal functions for TGF-β signaling in the control of IL-7Rα expression and in promoting T cell repertoire diversification.
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