TCR repertoire and Foxp3 expression define functionally distinct subsets of CD4+ regulatory T cells.

TCR repertoire and Foxp3 expression define functionally distinct subsets of CD4+ regulatory T cells.
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TCR 库和 Foxp3 表达定义了功能上不同的 CD4+ 调节性 T 细胞亚群。

DOI:
10.4049/jimmunol.0900514
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发表时间:
2009-09-01
影响因子:
4.4
通讯作者:
Kraj, Piotr
Kraj, Piotr
中科院分区:
医学2区
文献类型:
--
作者:
Kuczma, Michal;Pawlikowska, Iwona;Kopij, Magdalena;Podolsky, Robert;Rempala, Grzegorz A.;Kraj, Piotr

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尽管广泛的研究工作,以表征外周调节性T细胞(Treg)表达转录因子Foxp 3,其子集的复杂性,表型特征,TCR库和抗原特异性仍然是模糊的。在这里,我们确定和定义两个子集的外周Treg细胞不同的Foxp 3表达水平和TCR库。表达高水平Foxp 3的Treg细胞和未被初始CD 4 + T细胞利用的TCR呈现稳定的抑制表型,并且在未操作的小鼠中占主导地位的外周Treg群体。表达较低水平的Foxp 3并利用与初始CD 4 + T细胞共有的TCR的第二Treg亚群构成未操作小鼠中所有Treg细胞的一小部分,并富集具有与活化/效应T细胞表达的相同抗原特异性的Treg群体。当该Treg亚群成为抗原特异性Treg细胞的主要群体时,其在对抗原的应答期间经历广泛扩增。因此,表达与初始CD 4 + T细胞共有的TCR的Treg细胞具有灵活的表型,并且可以下调Foxp 3表达,这可以在免疫应答结束时恢复免疫平衡或将这些细胞转化为产生炎性细胞因子的效应T细胞。
Despite extensive research efforts to characterize peripheral regulatory T cells (Treg) expressing transcription factor Foxp3, their subset complexity, phenotypic characteristics, TCR repertoire and antigen specificities remain ambiguous. Here, we identify and define two subsets of peripheral Treg cells differing in Foxp3 expression level and TCR repertoires. Treg cells expressing a high level of Foxp3 and TCRs not utilized by naive CD4+ T cells present a stable suppressor phenotype and dominate the peripheral Treg population in unmanipulated mice. The second Treg subset, expressing a lower level of Foxp3 and utilizing TCRs shared with naive CD4+ T cells constitutes a small fraction of all Treg cells in unmanipulated mice and enriches Treg population with the same antigen specificities as expressed by activated/effector T cells. This Treg subset undergoes extensive expansion during response to antigen when it becomes a major population of antigen-specific Treg cells. Thus, Treg cells expressing TCRs shared with naive CD4+ T cells have a flexible phenotype and may downregulate Foxp3 expression which may restore immune balance at the conclusion of immune response or convert these cells to effector T cells producing inflammatory cytokines.
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