生殖中心介导的B细胞对SARS-CoV-2增强免疫反应的扩大
Sameer Kumar Malladi1, Deepika Jaiswal2, Baoling Ying3
1Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA.
Science immunology
|October 10, 2025
概括
SARS-CoV-2 mRNA 疫苗驱动生殖中心 B 细胞反应,这对抗体多样性至关重要. 在补充疫苗接种后发现的一种特定抗体 (mAb-52) 对多种SARS-CoV-2变体进行了广泛的中和.
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:
- 生殖中心 (GCs) 对于抗体多样化和亲和力成熟至关重要.
- SARS-CoV-2 mRNA 疫苗会诱导 GC B 细胞反应,但它们对针对变种的免疫范围的影响尚不清楚.
研究的目的:
- 为了分析生殖中心B细胞对mRNA增强免疫接种后对SARS-CoV-2的反应.
- 确定针对SARS-CoV-2变种的抗体识别和中和的范围.
主要方法:
- 对9名健康成年人mRNA后补丁疫苗接种的生殖中心B细胞克隆的分析.
- 单克隆抗体 (mAbs) 的表征用于尖端蛋白识别,包括向受体结合域 (RBD).
- 对SARS-CoV-2菌株的中和活性评估以及对子的体内保护研究.
主要成果:
- 77.8%的GC B细胞克隆识别了SARS-CoV-2尖端蛋白,其中37.8%的目标是RBD.
- 一种特定的RBD向的mAb (mAb-52) 中和了所有测试的SARS-CoV-2变种,包括XEC.
- mAb-52,利用IGHV3-66克隆型,保护了仓鼠免受EG.5.1变种的影响,并模仿了ACE2结合.
结论:
- 在SARS-CoV-2增强疫苗接种后,生殖中心反应对于开发交叉变异B细胞免疫力至关重要.
- 在GC B细胞中,广泛的体质突变导致了对病毒变异的广泛抗体反应.
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