Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520 USA.
Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut 06520 USA.
Nat Commun. 2016 Nov 9;7:13346. doi: 10.1038/ncomms13346.
Tissue-resident memory CD8+ T (CD8 T) cells are an essential component of protective immune responses at barrier tissues, including the female genital tract. However, the mechanisms that lead to the initiation of CD8 T-mediated protective immunity after viral infection are unclear. Here we report that CD8 T cells established by 'prime and pull' method confer protection against genital HSV-2 infection, and that IFN-γ produced by CD8 T cells is required for this protection. Furthermore, we find that CD8 T-cell restimulation depends on a population of CD301b antigen-presenting cells (APC) in the lamina propria. Elimination of MHC class I on CD301b dendritic cells abrogates protective immunity, suggesting the requirement for cognate antigen presentation to CD8 T cells by CD301b dendritic cells. These results define the requirements for CD8 T cells in protection against genital HSV-2 infection and identify the population of APC that are responsible for activating these cells.
组织驻留记忆 CD8+T(CD8 T)细胞是包括女性生殖道在内的屏障组织保护性免疫反应的重要组成部分。然而,导致病毒感染后 CD8 T 介导的保护性免疫的机制尚不清楚。在这里,我们报告说,“引发和拉动”方法建立的 CD8 T 细胞可提供针对生殖器单纯疱疹病毒 2 型(HSV-2)感染的保护,并且 CD8 T 细胞产生的 IFN-γ是这种保护所必需的。此外,我们发现 CD8 T 细胞的再刺激依赖于固有层中的一群 CD301b 抗原呈递细胞(APC)。MHC Ⅰ类分子在 CD301b 树突状细胞上的消除会破坏保护性免疫,表明 CD301b 树突状细胞需要对 CD8 T 细胞进行同种抗原呈递。这些结果定义了 CD8 T 细胞在预防生殖器 HSV-2 感染中的要求,并确定了负责激活这些细胞的 APC 群体。