Transcription factor Foxo1 represses T-bet-mediated effector functions and promotes memory CD8(+) T cell differentiation.

Transcription factor Foxo1 represses T-bet-mediated effector functions and promotes memory CD8(+) T cell differentiation.
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DOI:
10.1016/j.immuni.2012.01.015
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发表时间:
2012-03-23
期刊:
影响因子:
32.4
通讯作者:
Shrikant PA
Shrikant PA
中科院分区:
医学1区
文献类型:
--
作者:
Rao RR;Li Q;Gubbels Bupp MR;Shrikant PA

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进化上保守的 Foxo 转录因子是静止和长寿的重要调节因子。尽管已知 Foxo1 在调节 CD8+ T 细胞运输和稳态中很重要,但其在抗原刺激的 CD8+ T 细胞功能分化中的作用尚不清楚。在此,我们证明 Foxo1 的失活对于指导 T-bet 转录因子介导的 CD8+ T 细胞效应分化至关重要。 Foxo1 失活依赖于 mTORC1 激酶,因为 mTORC1 的阻断消除了 mTORC2 介导的 Akt (Ser473) 激酶磷酸化,导致 Foxo1 依赖性从 T-bet 转换为 Eomesodermin 转录因子激活,并增加记忆前体。沉默 Foxo1 会消除白细胞介素 12 和雷帕霉素,增强 CD8+ T 细胞记忆反应,并恢复 T-bet 介导的效应功能。这些结果证明了 Foxo1 在主动抑制效应或终末分化过程以促进记忆 CD8+ T 细胞发育中的重要作用,并确定了 Foxo1 用于促进静止和长寿的功能多样化机制。
The evolutionary conserved Foxo transcription factors are important regulators of quiescence and longevity. Although, Foxo1 is known to be important in regulating CD8+ T cell trafficking and homeostasis, its role in functional differentiation of antigen stimulated CD8+ T cells is unclear. Herein, we demonstrate that inactivation of Foxo1 was essential for instructing T-bet transcription factor-mediated effector differentiation of CD8+ T cells. The Foxo1 inactivation was dependent on mTORC1 kinase, as blockade of mTORC1 abrogated mTORC2 mediated Akt (Ser473) kinase phosphorylation, resulting in Foxo1-dependent switch from T-bet to Eomesodermin transcription factor activation and increase in memory precursors. Silencing Foxo1 ablated interleukin-12 and rapamycin enhanced CD8+ T cell memory responses, and restored T-bet mediated effector functions. These results demonstrate an essential role of Foxo1 in actively repressing effector or terminal differentiation processes to promote memory CD8+ T cell development, and identify the functionally diverse mechanisms utilized by Foxo1 to promote quiescence and longevity.
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