在SARS-CoV-2感染中,交叉保护性呼吸道IgA以MyD88和MAVS依赖的方式被原始化
Moe Kobayashi1, Nene Kobayashi1, Kyoka Deguchi1
1Division of Viral Infection, Department of Infectious Disease Control, International Research Center for Infectious Diseases, Institute of Medical Science, The University of Tokyo, Tokyo, Japan.
NPJ vaccines
|February 27, 2025
概括
针对呼吸道IgA抗体的粘膜疫苗可以提供针对SARS-CoV-2变种的交叉保护. 像MyD88和MAVS这样的先天性免疫信号对于诱导这些保护性粘膜免疫反应至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 尖端蛋白突变逃避幽默免疫.
- 呼吸道抗病毒IgA抗体在预防SARS-CoV-2感染方面比循环IgG更有效.
- 天生的免疫信号在诱导粘膜IGA对抗SARS-CoV-2的作用尚未完全理解.
研究的目的:
- 调查先天免疫信号在诱导粘膜IGA对SARS-CoV-2的作用.
- 评估粘膜疫苗对SARS-CoV-2变种的交叉保护潜力.
- 探索鼻腔内接种疫苗策略的有效性.
主要方法:
- 哈姆斯特模型的SARS-CoV-2感染和恢复.
- 鼻腔内接种的疫苗是用非活化的全病毒或未添加的尖蛋白.
- 对异种SARS-CoV-2变种 (阿尔法,马,三角形,欧米克朗BA.1) 的交叉保护的评估.
- 在小鼠中分析呼吸道抗尖峰IgA水平和先天免疫信号通路 (MyD88,MAVS).
主要成果:
- 恢复的仓鼠显示对多个SARS-CoV-2变种的交叉保护.
- 鼻腔内无活化全病毒疫苗接种给子带来了完全的保护.
- 在康复的小鼠中,鼻内尖蛋白增强诱导了强大的呼吸IgA和保护对异种变异的保护.
- MyD88和MAVS信号通路似乎对内鼻刺激后的IgA诱导记忆很重要.
结论:
- 粘膜疫苗接种策略,特别是鼻内接种,可以诱导针对SARS-CoV-2的保护性IgA反应.
- 天生的免疫通路MyD88和MAVS与粘膜IgA记忆的发展有关.
- 这些发现支持开发针对不断演变的SARS-CoV-2菌株的交叉保护性粘膜疫苗.
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