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 tha...Continue Reading
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