Classical swine fever virus non-structural proteins modulate Toll-like receptor signaling pathways in porcine monocyte-derived macrophages
文献类型： 外文期刊
作者： Cao, Zhi 1 ; Yang, Qian 2 ; Zheng, Minping 1 ; Lv, Huifang 1 ; Kang, Kai 1 ; Zhang, Yanming 1 ;
作者机构： 1.Northwest A&F Univ, Coll Vet Med, Xianyang 712100, Shaanxi, Peoples R China
2.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Minist Agr, Key Lab Sustainable Dev Marine Fisheries, Qingdao 266071, Peoples R China
关键词： Classical swine fever virus; Non-structural proteins; Toll-like receptors; Innate immune; Porcine monocyte-derived macrophages
期刊名称：VETERINARY MICROBIOLOGY （ 影响因子：3.293； 五年影响因子：3.599 ）
ISSN： 0378-1135
年卷期： 2019 年 230 卷
页码：
收录情况： SCI
摘要： Toll-like receptors (TLRs) are crucial activators of the innate immune response that play various roles in viral infection. Studies have confirmed that classical swine fever virus (CSFV) infection has significant effects on the expression of immune effectors participating in TLR signaling pathways; however, the involvement of CSFV-encoded proteins in TLR signaling pathways remains unclear. In this study, lentiviral individually expressing CSFV non-structural proteins (NSPs) were constructed to identify the "key proteins" that affect TLR gene expression and to analyze the impacts of these proteins on factors downstream of the TLR signaling pathways. The results indicated that N-pro, NS2, NS3, NS3/4A, NS4B and NS5A all failed to induce the activation of NF-kappa B p65. Furthermore, NS4B was found to inhibit poly (I:C) stimulation-mediated activation of the TLR3 signaling pathway in porcine monocyte-derived macrophages (pMDMs), thereby suppressing the TRIF mRNA transcription, the IRF3 protein translation and the NF-kappa B p65 phosphorylation, and ultimately affecting the secretion of IL-6 and IFN-beta; CSFV NS5A protein could significantly increase the activation of MyD88 and IRF7 as well as the consequent synthesis of IFN-alpha in pMDMs. The results suggest that CSFV NSPs affect TLR-mediated innate immune responses in pMDMs.
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