Iborra Salvador, Martínez-López María, Khouili Sofía C, Enamorado Michel, Cueto Francisco J, Conde-Garrosa Ruth, Del Fresno Carlos, Sancho David
Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain.
Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain.
Immunity. 2016 Oct 18;45(4):847-860. doi: 10.1016/j.immuni.2016.08.019. Epub 2016 Sep 27.
Despite the crucial role of tissue-resident memory T (Trm) cells in protective immunity, their priming remains poorly understood. Here, we have shown differential priming requirements for Trm versus circulating memory CD8 T cells. In vaccinia cutaneous-infected mice, DNGR-1-mediated crosspresentation was required for optimal Trm cell priming but not for their skin differentiation or for circulating memory T cell generation. DNGR-1 dendritic cells (DCs) promoted T-bet transcription-factor induction and retention of CD8 T cells in the lymph nodes (LNs). Inhibition of LN egress enhanced Trm cell generation, whereas genetic or antibody blockade of DNGR-1 or specific signals provided during priming by DNGR-1 DCs, such as interleukin-12 (IL-12), IL-15, or CD24, impaired Trm cell priming. DNGR-1 also regulated Trm cell generation during influenza infection. Moreover, protective immunity depended on optimal Trm cell induction by DNGR-1 DCs. Our results reveal specific priming requirements for CD8 Trm cells during viral infection and vaccination.
尽管组织驻留记忆T(Trm)细胞在保护性免疫中起着关键作用,但其启动过程仍知之甚少。在这里,我们展示了Trm细胞与循环记忆CD8 T细胞不同的启动需求。在牛痘皮肤感染的小鼠中,DNGR-1介导的交叉呈递是Trm细胞最佳启动所必需的,但对其皮肤分化或循环记忆T细胞的产生并非必需。DNGR-1树突状细胞(DCs)促进T-bet转录因子的诱导以及CD8 T细胞在淋巴结(LNs)中的滞留。抑制淋巴结输出增强了Trm细胞的产生,而对DNGR-1或DNGR-1 DCs在启动过程中提供的特定信号(如白细胞介素-12(IL-12)、IL-15或CD24)进行基因或抗体阻断,则会损害Trm细胞的启动。DNGR-1在流感感染期间也调节Trm细胞的产生。此外,保护性免疫依赖于DNGR-1 DCs对Trm细胞的最佳诱导。我们的结果揭示了病毒感染和疫苗接种期间CD8 Trm细胞特定的启动需求。