在SARS-CoV-2增强疫苗接种中IL-4+记忆T细胞的作用
Jumana Khalil1,2, Kosuke Miyauchi3,4, Yosie Suzuki4
1Division of Molecular Pathology, Research Institute for Biomedical Science, Tokyo University of Science, Japan.
International immunology
|August 30, 2025
概括
生殖中心和卵泡辅助T细胞对于SARS-CoV-2疫苗的初始反应至关重要. 然而,增强免疫使用了独立于这些细胞的替代途径来产生对变种的保护性免疫力.
科学领域:
- 免疫学
- 疫苗学
- 病毒学
背景情况:
- 生殖中心 (GC) 和卵泡辅助T细胞 (TFH) 对适应性免疫至关重要,但它们在SARS-CoV-2疫苗反应中的特定作用需要进一步阐明.
- 了解这些细胞动态对于优化疫苗的有效性至关重要,特别是在多样化的群体中以及对抗病毒变异的进化.
研究的目的:
- 调查在SARS-CoV-2疫苗接种后对初级和记忆抗体产生TFH依赖性GC反应的必要性.
- 探索支持记忆B细胞反应的替代免疫机制,特别是当GC功能受到损害时.
主要方法:
- 在疫苗接种的不同阶段使用条件丧失功能的小鼠模型去除TFH细胞 (初级与记忆).
- 通过SARS-CoV-2尖端蛋白进行初级和辅助免疫接种后评估了抗体的产生和B细胞的反应.
- 研究了B细胞IL-4受体信号传递的作用和IL-4表达记忆T细胞 (IL-4+Tm) 的特征.
主要成果:
- 以TFH为媒介的GC反应对于SARS-CoV-2疫苗的初级免疫力至关重要.
- 增强免疫引发了独立于TFH的卵泡外B细胞回应.
- 在B细胞中IL-4信号传递对于初级抗体和记忆抗体的产生至关重要.
- 发现了一种新型IL-4+Tm细胞群,与毛囊外反应相关,能够中和SARS-CoV-2变种.
- 在TFH缺乏的情况下,基于Omicron的增强恢复了免疫力.
结论:
- 对于SARS-CoV-2疫苗初始反应来说,TFH细胞是不可或缺的,但通过TFH独立机制可以维持记忆免疫力.
- IL-4+Tm细胞代表幽默免疫的替代途径,提供潜在的治疗途径,特别是对于免疫受损的个体.
- 这些发现为免疫记忆的可塑性提供了关键的见解,并为下一代SARS-CoV-2疫苗的开发提供了信息.
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