CD4 T cell help prevents CD8 T cell exhaustion and promotes control of Mycobacterium tuberculosis infection.

CD4 T cell help prevents CD8 T cell exhaustion and promotes control of Mycobacterium tuberculosis infection.
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CD4 T 细胞有助于防止 CD8 T 细胞耗竭并促进结核分枝杆菌感染的控制。

DOI:
10.1016/j.celrep.2021.109696
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发表时间:
2021-09-14
期刊:
影响因子:
8.8
通讯作者:
Behar SM
Behar SM
中科院分区:
生物学1区
文献类型:
--
作者:
Lu YJ;Barreira-Silva P;Boyce S;Powers J;Cavallo K;Behar SM

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CD 4 T细胞对于结核病的免疫至关重要,因为它们产生细胞因子,包括干扰素-γ。在结核分枝杆菌感染期间,CD 4 T细胞是否作为“辅助”细胞促进最佳CD 8 T细胞应答尚不清楚。使用两个独立的模型,我们表明,CD 4 T细胞帮助增强CD 8效应功能,并防止CD 8 T细胞耗竭。我们证明了CD 4和CD 8 T细胞在促进感染小鼠存活方面的协同作用。纯化的CD 8 T细胞在体外有效地限制了细胞内细菌的生长。因此,CD 4 T细胞辅助在产生针对M的保护性CD 8 T细胞应答中起重要作用。结核感染的体外和体内研究。我们推断,诱导CD 4和CD 8 T细胞的疫苗比仅诱导CD 4或CD 8 T细胞的疫苗更有可能成功。CD 4 T细胞是否“帮助”CD 8 T细胞控制结核分枝杆菌感染尚不清楚。Lu等人证明,CD 8 T细胞是有帮助的,但不是无助的,它们维持效应功能并避免耗竭。辅助性CD 8 T细胞限制细胞内杆菌生长,并且CD 4和CD 8 T细胞之间的协同作用提高了感染小鼠的存活率。
CD4 T cells are essential for immunity to tuberculosis because they produce cytokines, including interferon-γ. Whether CD4 T cells act as “helper” cells to promote optimal CD8 T cell responses during Mycobacterium tuberculosis is unknown. Using two independent models, we show that CD4 T cell help enhances CD8 effector functions and prevents CD8 T cell exhaustion. We demonstrate synergy between CD4 and CD8 T cells in promoting the survival of infected mice. Purified helped, but not helpless, CD8 T cells efficiently restrict intracellular bacterial growth in vitro. Thus, CD4 T cell help plays an essential role in generating protective CD8 T cell responses against M. tuberculosis infection in vitro and in vivo. We infer vaccines that elicit both CD4 and CD8 T cells are more likely to be successful than vaccines that elicit only CD4 or CD8 T cells. Whether CD4 T cells “help” CD8 T cells to control Mycobacterium tuberculosis infection is unknown. Lu et al. demonstrate that helped, but not helpless, CD8 T cells maintain effector functions and avoid exhaustion. Helped CD8 T cells restrict intracellular bacillary growth, and synergy between CD4 and CD8 T cells prolongs survival of infected mice.
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