Homologous recombination technology generated recombinant pseudorabies virus expressing EGFP facilitates to evaluate its susceptibility to different cells and screen antiviral compounds

Abstract

Pseudorabies virus (PRV) is considered as an emerging zoonotic pathogen since its isolation from a human case. Meanwhile, the disease caused by PRV infection has led huge economic losses to Chinese pig industry since 2011. In this study, we constructed a recombinant PRV stably expressing the enhanced green fluorescent protein (EGFP) by homologous recombination technology for evaluating its susceptibility to different human cell lines and screening antiviral compounds. Stably expressed EGFP by this designed rPRVHuN-EGFP virus was confirmed in the infected cells, moreover, the growth kinetics of which was similar to that of wild type strain. Importantly, the application of this rPRV allowed us to easily verify its infectivity in all tested human cell lines, although the infection efficiencies were lower than that in PK15 cells. Meanwhile, the antiviral activities of harmine and PHA767491 were also conveniently validated in vitro, as directly reflected by the reduced EGFP signals. These results demonstrate that this recombinant PRV virus should be a useful tool for basic virology researches and antiviral agent screening.