广泛中和抗体VRC01的预防有效性取决于HIV-1包膜序列特征
Michal Juraska1, Hongjun Bai2,3, Allan C deCamp1
1Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Center, Seattle, WA 98109.
概括
对HIV-1序列的基因型选分析显示,在获得的HIV-1菌株中VRC01表位的距离与VRC01广泛中和抗体 (bnAb) 的预防疗效相关. 这一发现有助于预测bnAb对HIV-1的有效性.
科学领域:
- 免疫学和病毒学
- 艾滋病毒/艾滋病研究研究
- 疫苗开发 疫苗开发
背景情况:
- 抗体介导预防 (AMP) 试验评估了广泛中和抗体 (bnAb) VRC01对HIV-1获取的预防疗效 (PE).
- 之前的研究结果表明,VRC01的疗效根据HIV-1封面 (Env) 中和灵敏度而异,以80%的抑制度 (IC80) 衡量.
研究的目的:
- 进行基因型分析,以确定与VRC01的预防有效性相关的HIV-1序列特征.
- 通过评估PE如何与特定的HIV-1序列特征相关,来补充中和灵敏度评估.
主要方法:
- 从AMP试验中被诊断为HIV-1的参与者的早期血样本中分析了HIV-1Env氨基酸 (AA) 序列.
- 进行了基因型选分析,以将Env序列特征与预防有效性相关联.
- 量化VRC01表位距离和基于Env序列计算的VRC01 IC80.0的预测概率.
主要成果:
- VRC01 PE最强的相关系是VRC01表位距离,测量了与VRC01-敏感基准菌株的差异.
- 在HVTN 704/HPTN 085中,基于Env序列的VRC01 IC80的预测概率>1μg/mL与PE显著相关.
- 在HVTN 703/HPTN 081中,50个与VRC01结合相关的Env AA位置的物理化学加权哈明距离与PE有显著的相关性.
结论:
- 艾滋病毒-1 Env 序列特征,特别是 VRC01 表位距离,是 VRC01 预防有效性的显著相关值.
- 结合突变评分 (例如,BLOSUM62) 和相互作用权重可以增强基于Env序列的生物标志物用于VRC01疗效预测.
- 未来的研究应该探索这些发现对其他bnAbs和bnAb组合的概括性.
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