1887

Abstract

Bovine viral diarrhoea virus (BVDV) causes significant economic losses to the cattle industry worldwide. Previously, we demonstrated that heme oxygenase-1 (HO-1) can inhibit BVDV replication via an unknown molecular mechanism. To elucidate the mechanism involved, we assess whether the HO-1 downstream metabolites carbon monoxide (CO), biliverdin (BV) and iron affect BVDV replication. We treated Madin-Darby bovine kidney (MDBK) cells with an exogenous CO donor, CORM-2. We found that CORM-2 but not its inactive form (iCORM-2) inhibited BVDV replication in a dose-dependent and time duration-dependent manner, suggesting a CO-specific mediation of the CORM-2 antiviral effect. Direct incubation of BVDV with high-dose CORM-2 reduced virus titres, suggesting that CORM-2 attenuates BVDV growth by both physically inactivating virus particles in the extracellular environment and affecting intracellular BVDV replication, but mainly via an intracellular mechanism. Exogenous BV treatment, both post-infection and co-incubation with BVDV, inhibited BVDV replication in a dose-dependent manner, indicating that BV has potent antiviral activity against BVDV. Direct incubation of BVDV with BV had no significant effect on virus titres, indicating that BV is not virucidal and attenuates BVDV growth by affecting intracellular BVDV replication. Furthermore, BV was found to affect BVDV penetration but not attachment. However, increased iron via addition of FeCl3 did not interfere with BVDV replication. Collectively, the results of the present study demonstrate that the HO-1 metabolites BV and CO, but not iron, inhibit BVDV replication. These findings not only provide new insights into the molecular mechanism of HO-1 inhibition of BVDV replication but also suggest potential new control measures for future BVDV infection.

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2017-10-31
2019-09-18
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