Nucleocapsid protein from porcine epidemic diarrhea virus isolates can antagonize interferon-λ production by blocking the nuclear factor-κB nuclear translocation.

Ying Shan; Zi-qi Liu; Guo-wei LI; Cong Chen; Hao Luo; Ya-jie Liu; Xun-hui Zhuo; Xing-fen Shi; Wei-huan Fang; Xiao-liang LI

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Nucleocapsid protein from porcine epidemic diarrhea virus isolates can antagonize interferon-λ production by blocking the nuclear factor-κB nuclear translocation.

Author: Ying SHAN ¹ ; Zi-Qi LIU ¹ ; Guo-Wei LI ¹ ; Cong CHEN ¹ ; Hao LUO ¹ ; Ya-Jie LIU ¹ ; Xun-Hui ZHUO ² ; Xing-Fen SHI ³ ; Wei-Huan FANG ¹ ; Xiao-Liang LI ¹
Author Information

1. Zhejiang Province Key Lab of Preventive Veterinary Medicine, Institute of Preventive Veterainary Medicine, College of Animal Sciences, Zhejiang University, Hangzhou 310058, China.
2. Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences, Hangzhou 310013, China.
3. Animal Products Quality Testing Center of Zhejiang Province, Hangzhou 310020, China.
Publication Type:Journal Article
Keywords: Porcine epidemic diarrhea virus; Nucleocapsid protein; Interferon-λ (IFN-λ); Nuclear factor-κB (NF-κB); Intestinal epithelial cells
MeSH: Active Transport, Cell Nucleus; Animals; Coronavirus Infections; immunology; veterinary; virology; Genes, Viral; Host-Pathogen Interactions; immunology; Interferons; antagonists & inhibitors; biosynthesis; genetics; Interleukins; antagonists & inhibitors; biosynthesis; genetics; NF-kappa B; metabolism; Nucleocapsid Proteins; genetics; immunology; physiology; Porcine epidemic diarrhea virus; genetics; pathogenicity; physiology; Promoter Regions, Genetic; Swine; Swine Diseases; immunology; virology
From: Journal of Zhejiang University. Science. B 2018;19(7):570-580
CountryChina
Language:English
Abstract: Porcine epidemic diarrhea virus (PEDV) is a highly infectious pathogen that can cause severe diseases in pigs and result in enormous economic losses in the worldwide swine industry. Previous studies revealed that PEDV exhibits an obvious capacity for modulating interferon (IFN) signaling or expression. The newly discovered type III IFN, which plays a crucial role in antiviral immunity, has strong antiviral activity against PEDV proliferation in IPEC-J2 cells. In this study, we aimed to investigate the effect of PEDV nucleocapsid (N) protein on type III IFN-λ. We found that the N proteins of ten PEDV strains isolated between 2013 and 2017 from different local farms shared high nucleotide identities, while the N protein of the CV777 vaccine strain formed a monophyletic branch in the phylogenetic tree. The N protein of the epidemic strain could antagonize type III IFN, but not type I or type II IFN expression induced by polyinosinic-polycytidylic acid (poly(I:C)) in IPEC-J2 cells. Subsequently, we demonstrated that the inhibition of poly(I:C)-induced IFN-λ3 production by PEDV N protein was dependent on the blocking of nuclear factor-κB (NF-κB) nuclear translocation. These findings might help increase understanding of the pathogenesis of PEDV and its mechanisms for evading the host immune response.