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Integrin αvβ3 promotes infection by Japanese encephalitis virus.
Research in Veterinary Science 2017 April
Japanese encephalitis virus (JEV) is a mosquito-borne flavivirus that is one of the major causes of viral encephalitis diseases worldwide. The JEV envelope protein facilitates viral entry, and its domain III contains an Arg-Gly-Asp (RGD) motif, that may modulate JEV entry through the RGD-binding integrin. In this study, the roles of integrin αv and β3 on the infection of JEV were evaluated. Reduced expression of integrin αv/β3 by special shRNA confers 2 to 4-fold inhibition of JEV replication in BHK-21 cells. Meanwhile, antibodies specific for integrin αv/β3 displayed ~58% and ~33% inhibition of JEV infectivity and RGD-specific peptides produced ~36% of inhibition. Expression of E protein and JEV RNA loads were clearly increased in CHO cells transfected with cDNA encoding human integrin β3. Moreover, integrin αv mediates JEV infection in viral binding stage of life cycle. Therefore, our study suggested that integrin αv and β3 serve as a host factor associated with JEV entry into the target cells.
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