巨细胞直接依赖于位置的B细胞回忆到接种疫苗
Rama Dhenni1, Alexandra Carey Hoppé2, Arnold Reynaldi3
1Precision Immunology Program, Garvan Institute of Medical Research, Sydney, NSW, Australia; St. Vincent's Healthcare Clinical Campus, School of Clinical Medicine, Faculty of Medicine and Health, UNSW Sydney, Kensington, Sydney, NSW, Australia.
疫苗接种地点对免疫记忆非常重要. 排水淋巴结含有专门的记忆B细胞 (Bmems),通过巨细胞指导增强疫苗回忆反应.
科学领域:
- 免疫学
- 疫苗学
- 细胞生物学
背景情况:
- 疫苗诱导长寿命的血细胞和记忆B细胞 (Bmems),这对适应性免疫至关重要.
- 在抗原再暴露后,Bmems可以重新进入B细胞受体突变的生殖中心 (GCs).
- Bmems的解剖位置和位置可能会影响其回忆反应的有效性.
研究的目的:
- 研究解剖位置和特定免疫细胞群在接种疫苗后B细胞回忆反应中的作用.
- 要确定排水淋巴结中的记忆B细胞与非排水淋巴结中的记忆B细胞表现出不同的行为.
- 阐明子膜巨细胞 (SSM) 影响记忆B细胞命运和生殖中心参与的机制.
主要方法:
- 使用小鼠模型追踪免疫接种后淋巴结排水和非排水的B细胞行为.
- 研究了CD169+亚囊巨细胞 (SSM) 在亚囊中的作用.
- 分析了接受BNT162b2疫苗增强剂的人类参与者,评估了抗体分泌,GC参与和B细胞克隆扩张.
主要成果:
- 与循环中的Bmems相比,Bmems在排水淋巴结的亚囊中显示出增强的回忆反应和更大的GC重新进入.
- 在排水淋巴结内,Bmems的回忆转化为GC取决于CD169+SSM.
- 在同一支臂中增强BNT162b2疫苗导致广泛中和抗体的分泌速度更快,GC参与度增加,SARS-CoV-2特异性B细胞的克隆扩张更大.
结论:
- 在确定记忆B细胞命运方面, 干淋巴结SSM起着至关重要的, 以前没有被重视的作用.
- 接种疫苗的解剖位置和相关的免疫微环境显著影响了疫苗诱导的记忆的大小和质量.
- 策略性的疫苗注射,例如同源增强,可以优化免疫记忆回忆反应.
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