在先天免疫和病毒复制中CIV NS1蛋白的作用
Cheng Fu1, Wenhui Zhu2, Nan Cao1
1College of Animal Science & Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.
狗流感病毒NS1蛋白质通过降低关键的抗病毒受体和蛋白质来阻碍天生的免疫力. 移除NS1可以提高免疫反应,这表明针对CIV的新抗病毒策略.
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:
- 天生的免疫系统对于抗病毒防御至关重要.
- 流感A型病毒使用策略来逃避宿主免疫力.
- 狗流感病毒 (CIV) NS1蛋白在天生的免疫力中的作用尚不清楚.
研究的目的:
- 研究CIV NS1蛋白在先天免疫路径中的作用.
- 阐明NS1影响抗病毒信号传递的机制.
- 为了确定抗病毒疗法的潜在目标.
主要方法:
- 为CIV蛋白构建的真核体等离子体 (NS1,NP,PA,PB1,PB2).
- 评估了与MDA5和IFN-β促进体激活的蛋白质相互作用.
- 利用逆转基因来制造重组H3N2和NS1-null病毒 (rH3N2ΔNS1).
- 量化病毒标位和测量免疫相关基因和蛋白质的表达.
主要成果:
- CIV NS1蛋白质对抗MDA5介导的IFN-β激活.
- NS1降低了LGP2和RIG-I受体的调节,这是RIG-I通路的关键组成部分.
- NS1抑制了抗病毒蛋白 (MX1,OAS,STAT1,TRIM25) 和细胞因子 (IL-2,IFN,IL-8,IL-1β) 的表达.
- 与rH3N2ΔNS1相比,rH3N2ΔNS1的病毒标位较低,但对LGP2,RIG-I和下游抗病毒因子的激活增强,与rH3N2.2相比.
结论:
- CIV NS1蛋白在抑制先天性免疫反应方面发挥着重要作用.
- 通过干扰RIG-I信号通路,NS1促进病毒逃避.
- 向NS1可能为开发CIV抗病毒疗法提供一种新的策略.
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