ABSTRACT
@#ObjectiveTo explore the innate immune response mediated by interferon(IFN) induced by influenza B virus(IBV)infection.MethodsThe activation of IFN signaling pathway and the expression of IFN-stimulated genes were detected by qPCR using Madin Darby canine kidney(MDCK)cells infected with IBV as model. The supernatants of MDCK cells infected with IBV for 36 h and 48 h were collected and mixed with fresh medium to culture MDCK cells infected with IBV. The antiviral effect of endogenous IFN was detected by qPCR. After adding JAK-STAT pathway inhibitor CP,the supernatant of IBV infected MDCK cells was collected and the cells were cultured. The effect of JAK-STAT pathway inhibition on the antiviral effect of endogenous IFN was detected by qPCR.ResultsIBV effectively activated IFN signal pathway and induced the production of cytokines dominated by typeⅠIFN(IFNα,IFNβ)and typeⅢIFN(IFNλ1,IFNλ3).Meanwhile,MDCK cells infected with IBV induced a series of IFN-stimulated genes(ISGs)with broad-spectrum antiviral effect,such as ISG15,CCL5,CXCL10,MX1 and RIG-I. After CP was used to inhibit JAK-STAT pathway,the ability of ISGs production induced by IBV infection in MDCK cells and the corresponding antiviral effect were significantly inhibited.ConclusionMDCK cells infected with IBV effectively activated type Ⅰ and type Ⅲ IFN mediated JAK-STAT signaling pathways,which provided a reference for the further understanding the interaction between IBV and host.