摘要
Viral hemorrhagic septicemia virus(VHSV), belonging to the genus Novirhabdovirus, Rhabdoviridae family, is a causative agent of high mortality in fish and has caused significant losses to the aquaculture industry. Currently, no effective vaccines, Food and Drug Administration-approved inhibitors, or other therapeutic intervention options are available against VHSV. α-Lipoic Acid(LA), a potent antioxidant, has been proposed to have antiviral effects against different viruses. In this study, LA(CC_(50)= 472.6 lmol/L) was repurposed to exhibit antiviral activity against VHSV. In fathead minnow cells,LA significantly increased the cell viability post-VHSV infection(EC_(50)= 42.7 lmol/L), and exerted a dose-dependent inhibitory effect on VHSV induced-plaque, cytopathic effects, and VHSV glycoprotein expression. The time-of-addition assay suggested that the antiviral activity of LA occurred at viral replication stage. Survival assay revealed that LA could significantly upregulated the survival rate of VHSV-infected largemouth bass in both co-injection(38.095% vs. 1.887%,P < 0.01) and post-injection manner(38.813% vs. 8.696%, P < 0.01) compared with the control group. Additional comparative transcriptome and q RT-PCR analysis revealed LA treatment upregulated the expression of several antiviral genes, such as IRF7, Viperin, and ISG15. Moreover, LA treatment reduced VHSV-induced reactive oxygen species production in addition to Nrf2 and SOD1 expression. Taken together, these data demonstrated that LA suppressed VHSV replication by inducing antiviral genes expression and reducing VHSV-induced oxidative stress. These results suggest a new direction in the development of potential antiviral candidate drugs against VHSV infection.
基金
This work was supported by the Pearl River S&T Nova Program of Guangzhou(201806010047)
the National Natural Science Foundation of China(31771587)
Fundamental Research Funds for the Central Universities。
