编码SARS-CoV-2受体结合域的mRNA疫苗可以保护小鼠免受各种Omicron变异
Ryuta Uraki1,2, Masaki Imai1,2, Mutsumi Ito1
1Division of Virology, Institute of Medical Science, The University of Tokyo, Tokyo, 108-8639, Japan.
NPJ vaccines
|January 3, 2024
概括
新的基于脂质纳米粒子的mRNA疫苗针对SARS-CoV-2变种,如BA.5和XBB.1.5,显示出更好的疗效. 与祖先菌株相比,这些先进的疫苗提供了更好的保护,并减少了病毒载量.
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:
- SARS-CoV-2 变种的出现需要更新的疫苗策略.
- 基于脂质纳米粒子的mRNA疫苗编码受体结合域 (LNP-mRNA-RBD) 是一个有前途的平台.
研究的目的:
- 评估祖先类型和变种特定的LNP-mRNA-RBD疫苗对SARS-CoV-2的疗效.
- 为了比较不同的疫苗配方所赋予的免疫反应和保护.
主要方法:
- 小鼠用祖先型,BA.4/5型或双价LNP-mRNA-RBD疫苗进行免疫接种.
- 在挑战后评估了细胞反应,中和抗体标位和病毒负担.
主要成果:
- 祖先类型的疫苗显示出有限的中和活性和对BA.5.5的病毒载量减少.
- BA.4/5型和双价疫苗引起了强大的细胞反应和针对BA.5和XBB.1.5.5的强效中和标位.
- 含有BA.4/5型LNP-mRNA-RBD的疫苗在BA.5或XBB.1.5挑战后显著降低了病毒负担.
结论:
- 结合BA.4/5成分的LNP-mRNA-RBD疫苗显示出对当代SARS-CoV-2变种的增强疗效.
- 更新的疫苗配方对于有效控制不断发展的病毒菌株至关重要.
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