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Springer Science and Business Media LLC Nature Communications 15(1)
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    초록·키워드

    While CD4<sup>+</sup> T cells are a prerequisite for CD8<sup>+</sup> T cell-mediated protection against intracellular hepatotropic pathogens, the mechanisms facilitating the transfer of CD4-help to intrahepatic CD8<sup>+</sup> T cells are unknown. Here, we developed an experimental system to investigate cognate CD4<sup>+</sup> and CD8<sup>+</sup> T cell responses to a model-antigen expressed de novo in hepatocytes and reveal that after initial priming, effector CD4<sup>+</sup> and CD8<sup>+</sup> T cells migrate into portal tracts and peri-central vein regions of the liver where they cluster with type-1 conventional dendritic cells. These dendritic cells are locally licensed by CD4<sup>+</sup> T cells and expand the number of CD8<sup>+</sup> T cells in situ, resulting in larger effector and memory CD8<sup>+</sup> T cell pools. These findings reveal that CD4<sup>+</sup> T cells promote intrahepatic immunity by amplifying the CD8<sup>+</sup> T cell response via peripheral licensing of hepatic type-1 conventional dendritic cells and identify intrahepatic perivascular compartments specialized in facilitating effector T cell-dendritic cell interactions.

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