HCoV-229E不会触发早期的干扰素基因表达,并且在人类A549肺上皮细胞中逃避IFN信号传递
Rickard Lundberg1, Anna Jartti1, Jemna Heroum1
1Institute of Biomedicine, University of Turku, Turku, Finland.
Microbiology spectrum
|October 28, 2025
概括
季节性人类冠状病毒HCoV-229E通过阻止干扰素反应来逃避宿主免疫力. 与A型流感病毒不同,HCoV-229E不会诱导I型干扰素的产生或MxA的表达,从而阻碍抗病毒防御.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 传染性疾病 传染性疾病
背景情况:
- 冠状病毒会导致呼吸道感染,而病原发生受到免疫逃避的影响.
- 干扰素 (IFN) 诱导的抗病毒免疫对于控制病毒感染至关重要.
研究的目的:
- 调查季节性人类冠状病毒HCoV-229E如何逃避宿主天生的免疫反应,特别是干扰素 (IFN) 诱导和信号传递.
- 将HCoV-229E的免疫逃避策略与A型流感病毒 (IAV) 的免疫逃避策略进行比较.
主要方法:
- 人类肺部 (A549) 和肝瘤 (Huh7) 细胞感染HCoV-229E和IAV.
- 测量I型和III型IFN基因表达和IFN诱导的MxA表达.
- 细胞RNA从受感染细胞转移到未受感染细胞中,以评估模式识别受体 (PRR) 激活.
- 评估IFN-α预处理对病毒复制和MxA蛋白诱导的影响.
主要成果:
- 在没有诱导I/III型IFN或MxA表达的情况下,HCoV-229E在A549和Huh7细胞中复制.
- 来自HCoV-229E感染细胞的细胞RNA没有诱导IFN基因表达,这表明缺乏RIG-I类受体识别.
- 与HCoV-229E.不同的是,IAV感染诱导了强烈的IFN反应.
- 与IAV相比,IFN-α显示HCoV-229E复制的抑制能力较弱.
- HCoV-229E感染在早期和晚期的时间点有效地阻断了I型IFN诱导的MxA蛋白表达.
结论:
- HCoV-229E有效地逃避宿主细胞干扰素反应.
- 病毒很可能使用病毒RNA分子,不被PRRs识别,以避免天生的免疫力.
- 这种免疫逃避机制允许病毒复制并进一步抑制宿主防御.
- 这些发现突出了季节性和病原性冠状病毒之间的免疫逃避差异,为抗病毒策略提供了信息.
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