蓝舌病病毒(bluetongue virus,BTV)是一种严重危害绵羊等反刍动物的一种虫媒病毒,为研究蓝舌病病毒感染与宿主细胞干扰素抗病毒免疫应答的分子机制.研究以感染复数(MOI)为1的BTV诱导18、24、36 h的BHK-21细胞通过实时荧光定量PCR分析干扰素通路基因mRNA表达特征,以及 Western blot分析 MDA5、TRAF3、RIG-Ⅰ和TBK1蛋白表达.结果表明,在诱导24 h时,干扰素信号通路基因表达的变化最为明显,IFN-α、IFN-β、RIG-Ⅰ、TBK1、MDA5、VISA、TRAF3基因的mRNA表达水平呈上调表达,而IKKε、TRAF6基因的mRNA表达水平呈下调表达,在蛋白水平上MDA5、TBK1蛋白上调表达而RIG-Ⅰ、TRAF3蛋白下调表达,表明BTV感染诱导BHK-21细胞中Ⅰ型干扰素免疫应答,为进一步探究IFN-Ⅰ信号通路调控基因在BTV感染的宿主细胞抗病毒免疫机制研究奠定基础.
Abstract
Bluetongue virus is an arbovirus that seriously harms ruminants such as sheep,this study aims to investigate the molecular mechanism of bluetongue virus infection and host cell interferon antiviral immune response.The study was conducted to characterize the mRNA expression of inter-feron pathway genes by real-time fluorescence quantitative PCR,as well as Western blot analysis of MDA5,TRAF3,RIG-Ⅰ,and TBK1 protein expression in BHK-21 cells induced by BTV with a multiplicity of infections(MOI)of 1 for 18,24,and 36 h.The results showed that the most pro-nounced changes in the expression of interferon signaling pathway genes were observed at 24 h of induction,the gene mRNA expression levels of the IFN-α,IFN-β,RIG-Ⅰ,TBK1,MDA5,VISA,and TRAF3 genes were upregulated.However,the mRNA expression levels of IKKε and TRAF6 genes were downregulated.At the protein level,MDA5 and TBK1 proteins were upregulated while RIG-1 and TRAF3 proteins were downregulated,which showed that BTV infection induces a typeⅠ interferon immune response in BHK-21 cells.This study lays the foundation for further exploring the antiviral immunity mechanism of IFN-Ⅰ signaling pathway regulatory genes in host cells infected with BTV infection.
维普
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