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Conversion of effector CD4+ T cells to a CD8+ MHC II-recognizing lineage.
Cellular & Molecular Immunology ( IF 21.8 ) Pub Date : 2020-02-17 , DOI: 10.1038/s41423-019-0347-5
Elizabeth Robins 1, 2 , Ming Zheng 3 , Qingshan Ni 4 , Siqi Liu 1 , Chen Liang 1 , Baojun Zhang 1 , Jian Guo 1 , Yuan Zhuang 1 , You-Wen He 1 , Ping Zhu 3 , Ying Wan 4 , Qi-Jing Li 1
Affiliation  

CD4+ and CD8+ T cells are dichotomous lineages in adaptive immunity. While conventionally viewed as distinct fates that are fixed after thymic development, accumulating evidence indicates that these two populations can exhibit significant lineage plasticity, particularly upon TCR-mediated activation. We define a novel CD4-CD8αβ+ MHC II-recognizing population generated by lineage conversion from effector CD4+ T cells. CD4-CD8αβ+ effector T cells downregulated the expression of T helper cell-associated costimulatory molecules and increased the expression of cytotoxic T lymphocyte-associated cytotoxic molecules. This shift in functional potential corresponded with a CD8+-lineage skewed transcriptional profile. TCRβ repertoire sequencing and in vivo genetic lineage tracing in acutely infected wild-type mice demonstrated that CD4-CD8αβ+ effector T cells arise from fundamental lineage reprogramming of bona fide effector CD4+ T cells. Impairing autophagy via functional deletion of the initiating kinase Vps34 or the downstream enzyme Atg7 enhanced the generation of this cell population. These findings suggest that effector CD4+ T cells can exhibit a previously unreported degree of skewing towards the CD8+ T cell lineage, which may point towards a novel direction for HIV vaccine design.

中文翻译:

效应 CD4+ T 细胞向 CD8+ MHC II 识别谱系的转化。

CD4+ 和 CD8+ T 细胞是适应性免疫中的二分谱系。虽然传统上被视为胸腺发育后固定的不同命运,但越来越多的证据表明,这两个种群可以表现出显着的谱系可塑性,特别是在 TCR 介导的激活时。我们定义了一个新的 CD4-CD8αβ+ MHC II 识别群体,该群体由效应 CD4+ T 细胞的谱系转换产生。CD4-CD8αβ+ 效应 T 细胞下调 T 辅助细胞相关共刺激分子的表达并增加细胞毒性 T 淋巴细胞相关细胞毒性分子的表达。这种功能潜力的转变与 CD8+ 谱系偏斜的转录谱相对应。急性感染的野生型小鼠的 TCRβ 谱系测序和体内遗传谱系追踪表明,CD4-CD8αβ+ 效应 T 细胞源自真正的效应 CD4+ T 细胞的基本谱系重编程。通过启动激酶 Vps34 或下游酶 Atg7 的功能性缺失来削弱自噬增强了该细胞群的产生。这些发现表明,效应 CD4+ T 细胞可以表现出以前未报告的向 CD8+ T 细胞谱系倾斜的程度,这可能指向 HIV 疫苗设计的新方向。
更新日期:2020-02-18
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