内在免疫性是SARS-CoV-2感染中类型特异性反应的主要决定因素
Grace E Quirk1, Marta V Schoenle2,3, Kameron L Peyton2
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ, USA.
Nature immunology
|May 27, 2025
概括
疫苗免疫力增强了对SARS-CoV-2变体的中和抗体,但对漂移表位体的类型特异性B细胞反应仍然很差. 变异性表位的抗原性较差,而不是先前的免疫力,限制了这些关键的免疫反应.
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:
- 以前的免疫力,包括接种疫苗,可以影响B细胞对新型SARS-CoV-2变异的反应.
- 突发的SARS-CoV-2变种如Delta和Omicron BA.1的出现,由于表位的漂移而带来了挑战.
- 了解类型特异性抗体和B细胞记忆生成对于疫苗对变种的有效性至关重要.
研究的目的:
- 为了比较感染SARS-CoV-2 Delta和Omicron BA.1变种的未接种疫苗和接种疫苗的个体的类型特定B细胞反应.
- 研究先前免疫和内在抗原性对免疫反应对漂移性表位的影响.
- 确定影响产生中和抗体和对抗SARS-CoV-2变种的B细胞的因素.
主要方法:
- 对特定类型的B细胞反应的分析,包括中和抗体和记忆B细胞.
- 在初级变种感染和疫苗接种后变种感染中对反应的比较.
- 对抗原上相似的 (三角形) 和遥远的 (欧米克朗BA.1) 变种的反应的评估.
主要成果:
- 与初级感染相比,接种疫苗后的变种感染产生了较高的针对Delta和BA.1的中和抗体.
- 与原发性感染相比,接种疫苗的人群中,Delta变异感染显示了类型特定记忆B细胞的减少.
- 在BA.1感染中,类型特异性抗体和记忆B细胞在很大程度上是无法检测的,而不管先前的免疫力如何.
- 德尔塔和BA.1中漂移表位体的固有抗原性较差是限制反应的关键因素.
结论:
- 之前的免疫力增强了对SARS-CoV-2变种的中和抗体水平,但并不能克服对漂移表位体的不良反应.
- 变异性表位的内在抗原性显著影响类型特定的B细胞反应,经常取代先前免疫的效果.
- 提高疫苗抗原的免疫性可能会改善对漂移的SARS-CoV-2表位体的类型特异性反应.
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