Blocking of PDL-1 interaction enhances primary and secondary CD8 T cell response to herpes simplex virus-1 infection.

Blocking of PDL-1 interaction enhances primary and secondary CD8 T cell response to herpes simplex virus-1 infection.
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DOI:
10.1371/journal.pone.0039757
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Suvas S
Suvas S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Channappanavar R;Twardy BS;Suvas S

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程序性死亡配体 1 (PDL-1) 的阻断已被证明可以增强慢性病毒感染期间病毒特异性 CD8 T 细胞的功能。然而,启动时 PDL-1 阻断如何影响 CD8 T 细胞对急性感染的反应质量尚不清楚,并且仍然存在争议。该报告表明,初级和次级 CD8 T 细胞对单纯疱疹病毒 1 (HSV-1) 感染的反应程度受到 PDL-1 的控制。我们的结果表明,足垫 HSV-1 感染后,免疫显性 SSIEFARL 肽特异性 CD8 T 细胞上的 PD-1 表达增加。此外,感染后,CD11c+ 树突状细胞上的 PDL-1 表达水平也会增加。在皮肤 HSV-1 感染前一天和后三天腹膜内给予抗 PDL-1 单克隆抗体,导致效应细胞和记忆 CD8 T 细胞对 SSIEFARL 肽的反应显着增加。这是通过利用确定抗原特异性 CD8 T 细胞功能的离体测定(例如细胞内细胞因子测定、脱颗粒测定来测量细胞毒性和病毒清除)来测量 SSIEFARL 特异性 CD8 T 细胞的数量和质量来证明的。我们的结果讨论了阻断 PDL-1 相互作用的有益效果,同时给予预防性疫苗,以产生针对病毒感染的更有效的 CD8 T 细胞反应。
The blocking of programmed death ligand-1 (PDL-1) has been shown to enhance virus-specific CD8 T cell function during chronic viral infections. Though, how PDL-1 blocking at the time of priming affects the quality of CD8 T cell response to acute infections is not well understood and remains controversial. This report demonstrates that the magnitude of the primary and secondary CD8 T cell responses to herpes simplex virus-1 (HSV-1) infection is subject to control by PDL-1. Our results showed that after footpad HSV-1 infection, PD-1 expression increases on immunodominant SSIEFARL peptide specific CD8 T cells. Additionally, post-infection, the level of PDL-1 expression also increases on CD11c+ dendritic cells. Intraperitoneal administration of anti-PDL-1 monoclonal antibody given one day prior to and three days after cutaneous HSV-1 infection, resulted in a marked increase in effector and memory CD8 T cell response to SSIEFARL peptide. This was shown by measuring the quantity and quality of SSIEFARL-specific CD8 T cells by making use of ex-vivo assays that determine antigen specific CD8 T cell function, such as intracellular cytokine assay, degranulation assay to measure cytotoxicity and viral clearance. Our results are discussed in terms of the beneficial effects of blocking PDL-1 interactions, while giving prophylactic vaccines, to generate a more effective CD8 T cell response to viral infection.
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