记忆B细胞发育响应mRNASARS-CoV-2和纳米粒子免疫在小鼠中的反应
bioRxiv : the preprint server for biology
|November 19, 2025
概括
新型纳米粒子疫苗显示出产生广泛抗体反应的前景. 马赛克8b纳米颗粒增强了对SARS-CoV-2变体的B细胞抗体的记忆宽度,补充了mRNA疫苗的优势.
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:
- 纳米粒子免疫原体迅速诱导高抗体水平,并用于新型疫苗.
- 纳米粒子疫苗产生持久记忆B细胞反应的能力尚未完全理解.
研究的目的:
- 将血清和B细胞对SARS-CoV-2mRNA,同型β纳米粒子和马赛克8b纳米粒子疫苗的反应进行比较.
- 评估不同疫苗平台引起的免疫反应的范围和特征.
主要方法:
- 在小鼠中使用SARS-CoV-2武汉-胡-1mRNA疫苗,SARS-CoV-2 B.1.351同型纳米颗粒或马赛克8b纳米颗粒进行一次性疫苗接种.
- 对血清抗体水平,中和标位和记忆B细胞反应的分析.
- 从记忆B细胞中衍生和表征单克隆抗体.
主要成果:
- 来自所有三种疫苗方案的记忆B细胞具有相似的抗体序列,体位突变水平和克隆多样性.
- 马赛克纳米颗粒引发了比mRNA疫苗更广泛的血清反应,对一些不匹配的菌株产生更广泛的血清反应.
- mRNA疫苗接种导致了对SARS-CoV-2的最高血清中和标位.
- 来自马赛克8b纳米粒子接种疫苗的小鼠的单克隆抗体对SARS-CoV-2变体的扩散幅度更大.
结论:
- 无论mRNA疫苗还是纳米粒子疫苗都会引起记忆B细胞,产生针对各种RBD表观体的抗体.
- 马赛克8b纳米粒子免疫原体增强了B细胞衍生抗体对抗SARS-CoV-2变体的记忆范围.
- mRNA和纳米粒子疫苗在引起免疫反应方面具有独特的优势.
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