MHC II类作为代表性人类和猪H3N2流感A病毒的宿主特异性入口受体
Matias Cardenas1, Sasha Compton1, C Joaquin Caceres1,2
1Department of Population Health, College of Veterinary Medicine, University of Georgia, Athens, GA, USA.
Nature communications
|February 10, 2026
概括
流感A病毒可以使用MHCII,而不仅仅是酸,进入细胞. 这一发现揭示了流感病毒热带和宿主适应的新途径,影响了对病毒病原的理解.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 流感A型病毒 (FLUAV) 通常通过血凝素 (HA) 与酸 (SA) 结合进入宿主细胞.
- 某些FLUAV亚型 (H17,H18,H19) 使用主要基因相容性复合物II类 (MHCII) 作为替代的入口受体,挑战已建立的热带模式.
- 了解替代性进入机制对于预测病毒传播和病变发生至关重要.
研究的目的:
- 为了研究H3N2流感A病毒使用MHCII作为替代,酸独立入口受体的潜力.
- 确定适应猪宿主是否会改变H3N2病毒对MHCII的亲和力.
- 探索HA受体结合部位 (RBS) 中特定突变在介导MHCII使用中的作用.
主要方法:
- 对人类季节性 (hVIC/11) 和适应猪 (sOH/04) 的H3N2病毒进行比较分析.
- 使用表达人类 (HLA) 或猪 (SLA) MHCII 细胞的感染测定,包括去氧化细胞.
- 在hVIC/11.1.中HA受体结合部位 (RBS) 的位点定向突变发生.
主要成果:
- H3N2病毒可以以宿主特定的方式利用MHCII作为入口受体.
- 人类H3N2病毒对猪的适应增强了它们对猪白细胞抗原 (SLA) 的亲和力.
- H3N2病毒HA RBS中的特定突变使人类和猪MHCII的使用成为可能.
结论:
- 主体组织相容性复合体II类 (MHCII) 作为H3N2流感A病毒的酸独立入口受体.
- H3N2 FLUAV对宿主特定的MHCII使用对病毒病原和物种间传播有影响.
- 这些发现扩大了流感A病毒已知的受体谱,并突出了潜在的进化途径.
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