A Safe and Sensitive Antiviral Screening Platform Based on Recombinant Human Coronavirus OC43 Expressing the Luciferase Reporter Gene.

Abstract : Human coronaviruses (HCoVs) cause 15-30% of mild upper respiratory tract infections. However, no specific antiviral drugs are available to prevent or treat HCoV infections to date. Here, we developed four infectious recombinant HCoVs-OC43 (rHCoVs-OC43), which express the Renilla luciferase (Rluc) reporter gene. Among these four rHCoVs-OC43, rOC43-ns2DelRluc (generated by replacing ns2 with the Rluc gene) showed robust luciferase activity with only a slight impact on its growth characteristics. Additionally, this recombinant virus remained stable for at least 10 passages in BHK-21 cells. The rOC43-ns2DelRluc was comparable with its parental wild-type virus (HCoV-OC43-WT) with respect to the quantity of the antiviral activity of chloroquine and ribavirin. We showed that chloroquine strongly inhibited HCoV-OC43 replication in vitro, with an IC50 of 0.33 μM. However, ribavirin showed inhibition on HCoV-OC43 replication only at high concentrations which may not be applicable to humans in clinical treatment, with an IC50 of 10 μM. Furthermore, using a luciferase-based small interfering RNA (siRNA) screening assay, we identified double-stranded RNA-activated protein kinase (PKR) and DEAD-box RNA helicases (DDX3X) that exhibited antiviral activities, which were further verified by the use of HCoV-OC43-WT. Therefore, rOC43-ns2DelRluc represents a promising safe and sensitive platform for high throughput antiviral screening and quantitative analysis of viral replication.
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Contributor : Michel Courcelles <>
Submitted on : Wednesday, August 3, 2016 - 10:35:46 PM
Last modification on : Monday, October 8, 2018 - 5:44:05 PM

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Liang Shen, Yang Yang, Fei Ye, Gaoshan Liu, Marc Desforges, et al.. A Safe and Sensitive Antiviral Screening Platform Based on Recombinant Human Coronavirus OC43 Expressing the Luciferase Reporter Gene.. Antimicrobial Agents and Chemotherapy, American Society for Microbiology, 2016, 60 (9), pp.5492-5503. ⟨10.1128/aac.00814-16 ⟩. ⟨pasteur-01351547⟩

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