The effect of asparagine-13 in porcine epidemic diarrhea virus envelope protein on pathogenicity

文献类型： 外文期刊

第一作者： Li, Zhiwei

作者： Li, Zhiwei;Ma, Zhiqian;Zhao, Xiaojing;Li, Yongqi;Zheng, Congsen;Li, Yang;Guo, Xuyang;Xu, Lele;Zheng, Zifang;Zheng, Haixue;Xiao, Shuqi

作者机构：

关键词： Porcine epidemic diarrhea virus; virulence factor; envelope protein; pro-inflammatory cytokines; reverse genetic system

期刊名称：VETERINARY RESEARCH （ 影响因子：3.5； 五年影响因子：4.0 ）

ISSN： 0928-4249

年卷期： 2025 年 56 卷 1 期

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收录情况： SCI

摘要： The pathogenesis of porcine epidemic diarrhea virus (PEDV) has not been fully clarified, which seriously hinders the prevention of the disease. The envelope (E) protein of PEDV induces the expression of pro-inflammatory cytokines, but the role of these inflammatory reactions in PEDV pathogenicity is still unknown. In this study, the asparagine at position 13 was found to be crucial to PEDV E protein induced inflammatory response. Exogenously expressing the parent E protein, rather than the E mutant carrying N13A, induces the activation of NF-kappa B and expression of inflammatory factors, including IL-6, IL-8, and TNF-alpha. Compared with the parental rPEDV strain, the recombinant strain rPEDV-EN13A exhibited a significantly lower infectious titer and formed smaller plaques. In addition, rPEDV-EN13A induced lower expression of inflammatory factors in vitro and in vivo. The pathogenicity assay shows that the rPEDV-EN13A strain caused diminished fecal PEDV RNA shedding, delayed death time, and milder histopathological lesions to intestinal villi. Our data provide a unique perspective for exploring the pathogenic mechanism of PEDV and a new target for the development of attenuated PEDV live vaccines.

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