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首页> 外文期刊>Nature immunology >L-selectin-negative CCR7(-) effector and memory CD8(+) T cells enter reactive lymph nodes and kill dendritic cells
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L-selectin-negative CCR7(-) effector and memory CD8(+) T cells enter reactive lymph nodes and kill dendritic cells

机译:L-选择素阴性CCR7(-)效应子和记忆CD8(+)T细胞进入反应性淋巴结并杀死树突状细胞

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摘要

T lymphocytes lacking the lymph node-homing receptors L-selectin and CCR7 do not migrate to lymph nodes in the steady state. Instead, we found here that lymph nodes draining sites of mature dendritic cells or adjuvant inoculation recruited L-selectin- negative CCR7(-) effector and memory CD8(+) T cells. This recruitment required CXCR3 expression on T cells and occurred through high endothelial venules in concert with lumenal expression of the CXCR3 ligand CXCL9. In reactive lymph nodes, recruited T cells established stable interactions with and killed antigen-bearing dendritic cells, limiting the ability of these dendritic cells to activate naive CD4(+) and CD8(+) T cells. The inducible recruitment of blood-borne effector and memory T cells to lymph nodes may represent a mechanism for terminating primary and limiting secondary immune responses.
机译:缺乏淋巴结归巢受体L-选择素和CCR7的T淋巴细胞在稳定状态下不会迁移到淋巴结。相反,我们在这里发现成熟的树突状细胞或佐剂接种的淋巴结引流部位募集了L-选择素阴性CCR7(-)效应子和记忆CD8(+)T细胞。这种募集需要CXCR3在T细胞上表达,并通过高内皮小静脉与CXCR3配体CXCL9的腔表达协同发生。在反应性淋巴结中,募集的T细胞与带有抗原的树突状细胞建立了稳定的相互作用并被杀死,从而限制了这些树突状细胞激活天然CD4(+)和CD8(+)T细胞的能力。血液传播的效应子和记忆T细胞可诱导募集到淋巴结可能代表了终止一级免疫反应和限制二级免疫反应的机制。

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