Predominant Role of T Cell Receptor (TCR)-α Chain in Forming Preimmune TCR Repertoire Revealed by Clonal TCR Reconstitution System

Predominant Role of T Cell Receptor (TCR)-α Chain in Forming Preimmune TCR Repertoire Revealed by Clonal TCR Reconstitution System
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克隆 TCR 重建系统揭示 T 细胞受体 (TCR)-α 链在形成免疫前 TCR 库中的主要作用

DOI:
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发表时间:
2002
影响因子:
15.3
通讯作者:
T. Saito
T. Saito
中科院分区:
医学1区
文献类型:
--
作者:
T. Yokosuka;K. Takase;Misao Suzuki;Y. Nakagawa;S. Taki;Hidemi Takahashi;T. Fujisawa;H. Arase;T. Saito

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T细胞受体-α和-β链的CDR3区在识别抗原(Ag)-MHC复合体中起着核心作用。TCR谱系是基于CDR3对Ag的识别特异性而创建的。为了分析TcR-α和-β的潜在谱带以显示抗原特异性并生成TCR谱,我们建立了成百上千的TcR-α或-β转染体,它们含有来自细胞毒T细胞克隆RT-1的单个TcR-β或-α链,并随机挑选出TcR-HIVgp160多肽。令人惊讶的是,这种含有来自正常小鼠幼稚T细胞的随机CDR3TCR-β的β中,有三分之一可以与RT-1TCR-α重建抗原反应性TCR偶联。对于淋巴细胞性脉络膜脑膜炎病毒特异性TCR,TcR-α在形成Ag特异性TcR方面也有类似的主导作用,尽管频率很低。随后,我们建立了针对HIVgp160多肽的TcR-α和/或-β转基因(TG)小鼠,并分析了抗原特异性CTL的TCR谱。与TcR重组的结果相似,TcR-αTG产生的CTL具有异质性的TcR-β,而TcR-βTG诱导的CTL只有一个TcR-α。这些发现在最低限度参与CDR3β的情况下识别抗原,扩大了我们对TCR谱的灵活性的理解,并表明TCRTCR链在确定抗原特异性TCR前免疫谱系中起主导作用。
The CDR3 regions of T cell receptor (TCR)-α and -β chains play central roles in the recognition of antigen (Ag)-MHC complex. TCR repertoire is created on the basis of Ag recognition specificity by CDR3s. To analyze the potential spectrum of TCR-α and -β to exhibit Ag specificity and generate TCR repertoire, we established hundreds of TCR transfectants bearing a single TCR-α or -β chain derived from a cytotoxic T cell (CTL) clone, RT-1, specific for HIVgp160 peptide, and randomly picked up TCR-β or -α chains. Surprisingly, one-third of such TCR-β containing random CDR3β from naive T cells of normal mice could reconstitute the antigen-reactive TCR coupling with RT-1 TCR-α. A similar dominant function of TCR-α in forming Ag-specific TCR, though low-frequency, was obtained for lymphocytic choriomeningitis virus–specific TCR. Subsequently, we generated TCR-α and/or -β transgenic (Tg) mice specific for HIVgp160 peptide, and analyzed the TCR repertoire of Ag-specific CTLs. Similar to the results from TCR reconstitution, TCR-α Tg generated CTLs with heterogeneous TCR-β, whereas TCR-β Tg-induced CTLs bearing a single TCR-α. These findings of Ag recognition with minimum involvement of CDR3β expand our understanding regarding the flexibility of the spectrum of TCR and suggest a predominant role of TCR-α chain in determining the preimmune repertoire of Ag-specific TCR.
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