重复的mRNA疫苗接种顺序增强了之前COVID-19患者的SARS-CoV-2特异性CD8+ T细胞
Emily S Ford1,2, Koshlan Mayer-Blackwell2, Lichen Jing1
1Department of Medicine, University of Washington, Seattle, WA, USA.
Nature immunology
|December 6, 2023
概括
针对SARS-CoV-2感染和疫苗接种的混合免疫力提供了卓越的保护. 这项研究追踪了尖端反应性T细胞,揭示了在混合免疫的个体接种疫苗后显著的记忆T细胞扩张和新的T细胞反应.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 基因组学就是基因组学.
背景情况:
- 由于严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 感染和接种疫苗而产生的混合免疫力,被认为比单独暴露的免疫力更强大.
- 在这种混合免疫背景下了解T细胞反应的动态对于评估疫苗有效性和预测对SARS-CoV-2的长期保护至关重要.
研究的目的:
- 在具有混合免疫的个体中研究尖端反应性T (TS) 细胞的纵向动力学.
- 在之前感染SARS-CoV-2的个体中,在信使RNA (mRNA) 接种疫苗后,特征T细胞受体 (TCR) 谱系的变化.
主要方法:
- 从外围血液样本中识别和跟踪数千个索引TS细胞TCR序列.
- 分析大量的TCRβ长度谱,以监测TS细胞频率.
- 使用滴滴测序对配链TCRɑβ序列和TCR序列相似性聚类来识别公共TCR动机.
主要成果:
- mRNA疫苗接种诱导了记忆TS细胞克隆类型的显著扩张,主要是CD8+T细胞.
- 疫苗接种还引发了以前未见过的各种TS细胞克隆类型.
- 公开的CD8+和CD4+与尖端 (S) 特异性相关的TCR动机通过序列相似性聚类来确定.
结论:
- 该研究提供了混合免疫中TS细胞的详细动力学分析,突出了疫苗接种对先前存在的T细胞记忆的影响.
- 这些发现建立了一种方法,通过分析TCR目录,快速评估T细胞对疫苗和新兴病原体的反应.
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