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The thioredoxin-1 inhibitor Txnip restrains effector T cell and germinal center B cell expansion in mice.
European Journal of Immunology ( IF 4.5 ) Pub Date : 2020-09-09 , DOI: 10.1002/eji.202048851
Jonathan Muri 1 , Helen Thut 1 , Manfred Kopf 1
Affiliation  

Thioredoxin‐1 (Trx1) is a vital component for cellular redox homeostasis. In T cells, Trx1 donates electrons for the de novo synthesis of deoxyribonucleotides to allow rapid cell proliferation. The Trx‐interacting protein (Txnip) binds to the reduced Trx1 and inhibits its activity. However, the role of Txnip in adaptive immunity in vivo is unknown. Here, we show that absence of Txnip increased proliferation of effector T cells and GC B‐cell responses in response to lymphocytic choriomeningitis virus and Qβ virus‐like particles, respectively, but did not affect development and homeostasis of T and B cells. While downregulation of Txnip and concomitant upregulation of Trx1 is critical for rapid T‐cell expansion upon viral infection, re‐expression of Txnip and consequently inhibition of Trx1 is important to restrain late T‐cell expansion. Importantly, we demonstrated that T‐cell receptor (TCR) engagement but not CD28 costimulation is critically required for Txnip downregulation. Thus, this study further uncovers positive and negative control of lymphocyte proliferation by the Trx1 system.

中文翻译:

硫氧还蛋白-1抑制剂Txnip抑制小鼠中的效应T细胞和生发中心B细胞扩增。

硫氧还蛋白-1(Trx1)是细胞氧化还原稳态的重要组成部分。在T细胞中,Trx1捐赠电子用于脱氧核糖核苷酸的从头合成,从而使细胞迅速增殖。Trx相互作用蛋白(Txnip)与还原的Trx1结合并抑制其活性。然而,尚不清楚Txnip在体内适应性免疫中的作用。在这里,我们表明,Txnip的缺失分别增加了对淋巴细胞性脉络膜脑膜炎病毒和Qβ病毒样颗粒的效应T细胞的增殖和GC B细胞的反应,但并不影响T细胞和B细胞的发育和体内稳态。虽然Txnip的下调和Trx1的上调对于病毒感染后T细胞的快速扩增至关重要,但是Txnip的重新表达以及对Trx1的抑制对于抑制晚期T细胞的扩增很重要。重要的,我们证明,Txnip下调至关重要地需要T细胞受体(TCR)参与而不是CD28共刺激。因此,本研究进一步揭示了Trx1系统对淋巴细胞增殖的阳性和阴性控制。
更新日期:2020-09-09
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