Blimp-1 represses CD8 T cell expression of PD-1 using a feed-forward transcriptional circuit during acute viral infection.

Blimp-1 represses CD8 T cell expression of PD-1 using a feed-forward transcriptional circuit during acute viral infection.
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DOI:
10.1084/jem.20130208
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发表时间:
2014-03-10
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Boss JM
Boss JM
中科院分区:
其他
文献类型:
--
作者:
Lu P;Youngblood BA;Austin JW;Mohammed AU;Butler R;Ahmed R;Boss JM

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转录因子Blimp-1在急性LCMV感染过程中抑制效应CD8+T细胞中PD-1的表达。程序性细胞死亡1(PD-1)是一种免疫抑制受体,调节T细胞功能,但控制其表达的分子事件在很大程度上尚不清楚。我们发现B淋巴细胞诱导成熟蛋白1(Blimp-1)缺陷的CD8 T细胞在急性感染淋巴细胞性脉络膜脑膜炎病毒(LCMV)阿姆斯特朗株后,在CD8 T细胞分化的早期阶段不能抑制PD-1。BLIMP-1通过前馈抑制电路直接调节PD-1,并抑制PD-1的活化因子NFATc1的表达,从而抑制PD-1。BLIMP-1结合在PD-1基因座诱导抑制染色质结构,导致NFATc1从其位点被驱逐。这些数据将Blimp-1置于CD8 T细胞效应反应的重要阶段,并为其抑制PD-1提供了分子机制。
The transcription factor Blimp-1 represses PD-1 expression in effector CD8+ T cells during acute LCMV infection. Programmed cell death 1 (PD-1) is an inhibitory immune receptor that regulates T cell function, yet the molecular events that control its expression are largely unknown. We show here that B lymphocyte–induced maturation protein 1 (Blimp-1)–deficient CD8 T cells fail to repress PD-1 during the early stages of CD8 T cell differentiation after acute infection with lymphocytic choriomeningitis virus (LCMV) strain Armstrong. Blimp-1 represses PD-1 through a feed-forward repressive circuit by regulating PD-1 directly and by repressing NFATc1 expression, an activator of PD-1 expression. Blimp-1 binding induces a repressive chromatin structure at the PD-1 locus, leading to the eviction of NFATc1 from its site. These data place Blimp-1 at an important phase of the CD8 T cell effector response and provide a molecular mechanism for its repression of PD-1.
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