Abstract
Caprine arthritis-encephalitis (CAE) is a chronic progressive infectious disease caused by caprine arthritis-encephalitis virus (CAEV) that seriously threatens the goat industry. Chronic infection and life-long multi-tissue inflammation are the typical features of the disease. Innate antiviral immunity is essential for the host defense system that rapidly recognizes and eliminates invading viruses. Interferon β (IFN-β) is important for innate immunity and regulates immunity against a broad spectrum of viruses. To investigate the details of the IFN-β response to CAEV infection, the effects of six viral proteins and the molecular mechanisms by which they affect IFN-β production were analyzed. Overexpression of DU and Vif promote virus proliferation and inhibit the production of IFN-β. qRT-PCR and luciferase reporter assays showed that overexpression of Vif inhibits the expression of luciferase under the control of the ISRE, NF-κB or IFN-β promoter but does not affect the expression of IFN-β activated by IRF3, indicating that Vif negatively regulates IFN-β production by affecting upstream signal transduction of IRF3. Amino acids 149-164 of Vif were found to be necessary for the inhibitory effect of IFN-β production. Our results indicate that CAEV evades surveillance and clearance by intracellular innate immunity by downregulating IFN-β production.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2018YFD0500500) and the National Natural Science Foundation in China (no. 30771613).
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Conceived and designed the experiments: JH H. Performed the experiments: YL F, D L, H C, YX S, and JS W. Analyzed the data: YL F and JH H. Contributed reagents/materials /analysis tools: JH H. Wrote the paper: YL F, and JH H.
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Fu, Y., Lu, D., Su, Y. et al. The Vif protein of caprine arthritis encephalitis virus inhibits interferon production. Arch Virol 165, 1557–1567 (2020). https://doi.org/10.1007/s00705-020-04637-z
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DOI: https://doi.org/10.1007/s00705-020-04637-z