重复的Omicron暴露将SARS-CoV-2-特定的B细胞记忆进化重定向到最新的变异
Ryutaro Kotaki1, Saya Moriyama1, Shintaro Oishi1
1Research Center for Drug and Vaccine Development, National Institute of Infectious Diseases, Tokyo 162-8640, Japan.
来自旧疫苗的现有记忆B细胞可以适应新的SARS-CoV-2变种. 对Omicron BA.5的重复暴露促使这些记忆B细胞重定向特异性,增强对HK.3和JN.1等演变菌株的弹性.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 来自祖先SARS-CoV-2菌株的免疫印记可能会限制基于Omicron的助推剂的Omicron特定反应.
- 了解记忆B细胞的反应对于针对不断演变的病毒变异的有效疫苗策略至关重要.
研究的目的:
- 在接受祖先菌株mRNA疫苗的个体中,在重复暴露BA.5后,研究记忆B细胞的特异性和中和活性.
- 为了确定预先存在的B细胞是否能够适应新的SARS-CoV-2变种.
主要方法:
- 在BA.5暴露后对B (Bmem) 记忆细胞的特异性和中和活性进行分析.
- 克隆谱系分析以追踪Bmem细胞进化和特异性重定向.
- 重定向的Bmem细胞发育与de novo Bmem细胞的比较.
主要成果:
- 第二次BA.5暴露引起了BA.5尖端蛋白歪曲的Bmem细胞反应,与现有的抗体标位相关.
- 克隆谱系分析显示,BA.5-歪曲的Bmem细胞通过体质突变重定向了祖先菌株的特异性.
- 重定向的BA.5特异性Bmem细胞比de novoBmem细胞发展得更快,并且对病毒突变表现出弹性,适应HK.3和JN.1变异.
结论:
- 由较旧的疫苗启动的现有记忆B细胞可以将其特异性重定向到新出现的SARS-CoV-2变种.
- 这种特异性重定向增强了B细胞的反应和抗病毒演变的弹性,为更广泛的疫苗有效性提供了潜在的机制.
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