A CMV-induced adaptive human Vδ1+ γδ T cell clone recognizes HLA-DR.

A CMV-induced adaptive human Vδ1+ γδ T cell clone recognizes HLA-DR.
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DOI:
10.1084/jem.20212525
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发表时间:
2022-09-05
期刊:
The Journal of experimental medicine
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Deseke等人。用可溶性γδTCRs和CRISPR/CAS9筛选鉴定MHCII类表面受体HLADR是巨细胞病毒诱导的Vδ1+γδT细胞克隆的同源TCR配体,该T细胞克隆是交叉识别的白血病细胞。γδT细胞及其克隆性γδT细胞受体(TCR)在免疫应答中的先天和适应性作用尚不清楚。最近对γδTCR谱系的研究表明,在病毒感染过程中,单个Vδ1+γδT细胞克隆大量扩增。为了判断这种扩张是随机的还是实际上代表了TCR依赖的适应性免疫反应,需要有关它们的同源TCR配体的信息。在这里,我们使用CRISPR/Cas9介导的筛选方法鉴定了CMV诱导的Vγ3Vδ1+TCR靶细胞识别所需的HLADRA、RFXAP、RFX5和CIITA,进一步的鉴定表明该Vδ1+TCR与MHC II复合体HLADR存在直接相互作用。由于MHC II被干扰素-γ强烈上调,这些结果提示了炎症诱导的γδT细胞的MHC依赖的免疫反应。
Deseke et al. use soluble γδ TCRs and CRISPR/Cas9-mediated screening to identify the MHC class II surface receptor HLA-DR as the cognate TCR ligand of a CMV-induced Vδ1+ γδ T cell clone, which is cross-recognizing leukemia cells. The innate and adaptive roles of γδ T cells and their clonal γδ T cell receptors (TCRs) in immune responses are still unclear. Recent studies of γδ TCR repertoire dynamics showed massive expansion of individual Vδ1+ γδ T cell clones during viral infection. To judge whether such expansion is random or actually represents TCR-dependent adaptive immune responses, information about their cognate TCR ligands is required. Here, we used CRISPR/Cas9-mediated screening to identify HLA-DRA, RFXAP, RFX5, and CIITA as required for target cell recognition of a CMV-induced Vγ3Vδ1+ TCR, and further characterization revealed a direct interaction of this Vδ1+ TCR with the MHC II complex HLA-DR. Since MHC II is strongly upregulated by interferon-γ, these results suggest an inflammation-induced MHC-dependent immune response of γδ T cells.
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