外周的重复抗原刺激决定了脑驻留记忆性CD8 T细胞的组成和回忆反应。
Repetitive antigen stimulation in the periphery dictates the composition and recall responses of brain-resident memory CD8 T cells.
作者信息
Mix Madison R, van de Wall Stephanie, Heidarian Mohammad, Escue Elizabeth A, Fain Cori E, Pewe Lecia L, Hancox Lisa S, Arumugam Sahaana A, Sievers Cassie M, Badovinac Vladimir P, Harty John T
机构信息
Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Medical Scientist Training Program, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA; Interdisciplinary Graduate Program in Immunology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
Department of Pathology, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
出版信息
Cell Rep. 2025 Feb 25;44(2):115247. doi: 10.1016/j.celrep.2025.115247. Epub 2025 Feb 3.
The human brain harbors virus-specific, tissue-resident memory (T) CD8 T cells. However, the impact of repeated peripheral viral infection on the generation, phenotype, localization, and recall responses of brain T remains elusive. Here, utilizing two murine models of peripheral viral infection, we demonstrate that circulating memory CD8 T cells with previous antigen exposure exhibit a markedly reduced capacity to form brain T compared to naive CD8 T cells. Repetitively stimulated brain T also demonstrate differential inhibitory receptor expression, preserved functionality, and divergent localization patterns compared to primary memory counterparts. Despite these differences, repetitively stimulated brain T provide similar protection against intracranial infection as primary populations with superior recall-based recruitment of peripheral lymphocytes. As CD8 T cells may distinctly seed the brain with each repeated infection of the same host, these findings point to heterogeneity in the brain T pool that is dictated by prior peripheral antigen stimulation history.
人类大脑中存在病毒特异性的组织驻留记忆(T)CD8 T细胞。然而,反复的外周病毒感染对大脑T细胞的生成、表型、定位和回忆反应的影响仍不清楚。在此,利用两种外周病毒感染的小鼠模型,我们证明,与初始CD8 T细胞相比,先前接触过抗原的循环记忆CD8 T细胞形成大脑T细胞的能力明显降低。与初始记忆对应细胞相比,反复刺激的大脑T细胞还表现出不同的抑制性受体表达、保留的功能和不同的定位模式。尽管存在这些差异,但反复刺激的大脑T细胞对外颅内感染提供的保护与具有卓越基于回忆招募外周淋巴细胞能力的初始群体相似。由于同一宿主每次重复感染时CD8 T细胞可能会以不同方式定植于大脑,这些发现表明大脑T细胞库存在异质性,这是由先前的外周抗原刺激史决定的。
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