人类alphacoronavirus复制和天生的免疫诱导在呼吸道培养系统
Alejandra Fausto1,2, Clayton J Otter1,2, Leonel Torres3
1Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
mBio
|December 10, 2025
概括
人类的阿尔法冠状病毒HCoV-NL63和HCoV-229E不同影响宿主天生的免疫力. NL63激活肺细胞中的抗病毒途径,而229E使用nsp15内啡核酶U来抑制反应,帮助其复制.
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:
- 季节性人类冠状病毒 (HCoV),如HCoV-NL63 (NL63) 和HCoV-229E (229E),引起普通感冒,但比致命的贝塔冠状病毒研究较少.
- 了解这些常见的HCoVs如何与宿主天生的免疫反应相互作用,对于理解病毒病原和宿主防御机制至关重要.
研究的目的:
- 为了比较NL63和229E在不同人肺衍生的细胞系和初级鼻上皮培养中的复制动力学.
- 调查NL63和229E感染对宿主先天免疫通路的差异调节,包括干扰素 (IFN) 信号传递,OAS/RNase L和PKR.
- 阐明229E保存型内啡核酶U (EndoU) 在逃避宿主抗病毒反应中的作用.
主要方法:
- A549ACE2,MRC-5肺细胞系和初级鼻上皮层空气液界面 (ALI) 培养物感染了NL63和229E.
- 测量病毒复制率和动力学.
- 通过mRNA诱导和蛋白质激活对dsRNA诱导的抗病毒通路激活 (IFN,OAS/RNase L,PKR) 的评估.
- 对复合229E病毒与非活化的nsp15 EndoU进行分析,以确定其在宿主免疫逃避中的作用.
主要成果:
- NL63和229E都在鼻腔ALI培养物中有效复制,但NL63在肺细胞系中的复制量很小.
- NL63感染诱导了肺细胞中显著的IFN和PKR激活,而229E没有;这两种病毒都诱导了鼻细胞中的这些途径.
- 229E的nsp15 EndoU的失活导致dsRNA增加,增强抗病毒途径诱导,并减少病毒复制,突出其在免疫抑制中的作用.
结论:
- NL63和229E差异调节宿主dSRNA诱导的先天免疫通路,NL63在诱导肺细胞反应方面更有效.
- 229E nsp15 EndoU是一种关键的病毒抗剂,抑制抗病毒反应,促进有效的病毒复制.
- 这些发现为季节性HCoV的独特宿主病毒相互作用提供了洞察力,并将其与致病性β冠状病毒区分开来.
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