在非常罕见的前体B细胞条件下,不同的原始化结果
bioRxiv : the preprint server for biology
|December 9, 2024
概括
优化疫苗策略是参与罕见艾滋病毒广泛中和抗体前体B细胞的关键. 增加剂量免疫接种,使用沙宁辅助剂,有效地启动这些关键细胞进行保护性免疫.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 病毒学 病毒学
背景情况:
- 罕见的B细胞具有独特的病原体识别能力,对保护性免疫至关重要.
- 纯粹的B细胞,特别是像BG18类细胞这样的罕见子集,很难激活免疫反应.
研究的目的:
- 研究针对生殖线的疫苗抗原输送和辅助剂选择对非人类灵长类动物中罕见的BG18类HIV广泛中和抗体前体B细胞的原始化的影响.
- 确定最佳的免疫策略,以从极为罕见的B细胞群中引起反应.
主要方法:
- 非人类灵长类动物使用不同的疫苗抗原输送方法 (升级剂量,玻尿酸) 和辅助剂选择 (沙尼辅助剂SMNP) 进行免疫.
- 免疫接种后分析了生殖中心 (GC) 反应和BG18类细胞的存在.
- 在初级和二级免疫接种后评估了记忆B细胞种群,体质突变和抗体亲缘关系.
主要成果:
- 增加剂量 (ED) 用素辅助剂SMNP进行化是检测生殖中心中BG18类细胞的唯一策略.
- 在超过50%的动物中,ED+SMNP和玻尿酸+SMNP两种化都诱导了BG18类记忆B细胞.
- 疫苗特异性GC反应并不总是与检测BG18样记忆B细胞相关.
- 刺激增加了玻尿酸原始化组中的BG18类记忆B细胞,但这些细胞表现出较低的体质突变和亲属性,与后主要抗体标位相反相关.
结论:
- 疫苗抗原输送和辅助剂选择显著影响罕见的,广泛中和抗体前体B细胞的原始化.
- 用SMNP进行升级剂量免疫是有效的,可启动罕见的BG18类B细胞的反应.
- 抗体反机制可能在免疫接种后调节罕见的前体B细胞反应的发展和特征方面发挥关键作用.
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