混合免疫能改善B细胞和抗体对抗SARS-CoV-2变种
Emanuele Andreano1, Ida Paciello1, Giulia Piccini2
1Monoclonal Antibody Discovery (MAD) Lab, Fondazione Toscana Life Sciences, Siena, Italy.
Nature
|October 20, 2021
概括
以前感染或接种了SARS-CoV-2疫苗的人产生强大的抗体. 这些抗体对包括Beta和Gamma在内的新出现的COVID-19变种提供了更好的保护.
科学领域:
- 免疫学
- 病毒学
- 疫苗学
背景情况:
- 新出现的SARS-CoV-2变种威胁到疫苗有效性和单克隆抗体治疗.
- 了解B细胞和抗体反应对于抗击COVID-19至关重要.
研究的目的:
- 分析使用BNT162b2mRNA疫苗接种的原始和康复期个体的单细胞B细胞和抗体反应.
- 评估抗体对抗SARS-CoV-2变种的中和能力.
主要方法:
- 接种疫苗的初级和康复期个体的单细胞记忆B细胞分析.
- 对SARS-CoV-2及其变种 (阿尔法,贝塔,玛,三角形) 的单克隆抗体产生和中和测定.
主要成果:
- 产生了超过 3,000 个单克隆抗体,其中超过 400 个能够中和原来的 SARS-CoV-2 菌株.
- 贝塔和玛变种显示出显著的抗体逃逸 (~70%),而阿尔法和德尔塔变种的影响较小.
- 来自康复期个体的抗体表现出更大的强度和广度,具有与广泛中和相关的特定生殖系 (IGHV2-5;IGHJ4-1).
结论:
- 以前感染或接种疫苗的个体产生更强效和广泛的中和抗体.
- 血清阳性个体能够更好地控制新出现的SARS-CoV-2变种.
- IGHV2-5;IGHJ4-1细菌系有助于强大的抗体对抗COVID-19.
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