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表达COBRA设计的流感血素的rAAV在单剂量时产生一种保护性和持久的自适应性免疫反应
Kristin B Wiggins1,2, Stephen M Winston1,3, Isaiah L Reeves1,3
1St. Jude Graduate School of Biomedical Sciences, Memphis, Tennessee, USA.
Journal of virology
|July 30, 2024
概括
一种表达计算优化广泛反应抗原 (COBRA) 的新型重组腺病毒相关病毒 (rAAV) 疫苗提供了对流感的长期保护. 这种单剂量疫苗诱导了强大的免疫反应,为预防季节性流感提供了一个有希望的新策略.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 由于抗原漂移,季节性流感疫苗需要经常更新,导致有效性变化,特别是在弱势群体中.
- 开发具有广泛保护性和持久性的流感疫苗是一个关键的全球公共卫生目标.
研究的目的:
- 评估一种单剂量复合腺核病毒相关病毒 (rAAV) 疫苗,该疫苗编码了针对H1型流感的计算优化广泛反应抗原 (COBRA).
- 在临床前模型中评估疫苗诱导中和抗体,广泛保护和长期免疫的能力.
主要方法:
- 单次肌肉注射一种表达COBRA衍生H1血素抗原的rAAV载体.
- 评估幽默和细胞免疫反应,病毒载荷,并保护从致命流感挑战后的发病率和死亡率在小鼠和.
- 对流感菌株的免疫反应持续时间和范围的评估.
主要成果:
- 一次rAAV-COBRA疫苗剂量诱导了天真和免疫前动物的强烈中和和广泛保护性抗体.
- 接种疫苗的动物显示病毒载量显著降低,并且至少在5个月内完全防止发病和死亡.
- CpG动机丰富作用为辅助剂,增强特定于HA头部和干部区域的T细胞反应 (CD4+和CD8+).
结论:
- 该rAAV载体平台有效地传递来自COBRA的流感抗原,从而产生持久和广泛的保护.
- 该疫苗显示出改善季节性流感预防的潜力,即使在具有先前免疫力的动物中也是如此.
- 需要对病毒载体进行进一步的研究,以加强流感疫苗的研发.
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