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SARS-CoV-2 N-特定CD8的抗病毒作用

Francesco Manfredi¹, Chiara Chiozzini¹, Flavia Ferrantelli¹

¹National Center for Global Health, Istituto Superiore di Sanità, Viale Regina Elena, 299, 00161, Rome, Italy.

|June 2, 2023

概括

携带SARS-CoV-2核体 (N) 蛋白质的工程外细胞囊 (EV) 诱导肺免疫. 这种N-特定的CD8+ T细胞反应有效控制病毒复制,并可能提供广泛的保护,防止新出现的变异.

科学领域:

免疫学免疫学免疫学
疫苗学疫苗学疫苗学
病毒学病毒学

背景情况:

有效的肺免疫对于针对呼吸道病原体的疫苗至关重要.
设计为显示SARS-CoV-2核体 (N) 蛋白的细胞外囊泡 (EV) 诱导小鼠的保护性免疫力.
在控制SARS-CoV-2在肺中的复制方面,N-特定的CD8+T细胞免疫的作用尚不清楚.

研究的目的:

为了研究N-工程EVs接种疫苗后,肺部诱导N-特定的CD8+T细胞免疫力.
评估这种免疫在免疫接种后的不同时间点对肺部病毒复制的影响.
评估这种疫苗策略对抗SARS-CoV-2变种的潜力.

主要方法:

在K18-hACE2转基因小鼠中,使用N-engineered EVs进行免疫.
在病毒挑战之前和之后分析了免疫反应,包括N特定的CD8+T淋巴细胞.
肺部的病毒复制量在增强后的三周和三个月后得到量化.

主要成果:

接种疫苗后3周在肺部显著减少病毒复制 (>3-日志).
病毒复制受损与斯派克特异性CD8+T细胞诱导减少相关.
抗病毒作用在增强后的三个月内持续存在,与持续的N特异性CD8+T-居民记忆细胞相关.

结论:

通过N工程设计的电动汽车有效地诱导肺部的保护性N特异性CD8+T细胞免疫.
这种免疫力控制了SARS-CoV-2的复制,并显示了持续性.
由于N蛋白的低突变率,该疫苗策略有可能控制当前和新出现的SARS-CoV-2变种.

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