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Classical swine fever virus NS5A protein localizes to endoplasmic reticulum and induces oxidative stress in vascular endothelial cells

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Abstract

Classical swine fever virus (CSFV) causes a severe disease of pigs that is characterized by hemorrhage, disseminated intravascular coagulation, and leucopenia. Until now, the role of the nonstructural protein 5A (NS5A) produced by CSFV in the pathogenesis of CSF is not well known. In this study, we investigated the function of CSFV NS5A by examining its role in the induction of oxidative stress and related intracellular events. Stable swine umbilical vein endothelial cell lines expressing CSFV NS5A were established and showed that CSFV NS5A is localized to endoplasmic reticulum and induces oxidative stress associated with enhanced reactive oxygen species production. The expression of NS5A protein exerts different effects on the three major antioxidants. Particularly, it exhibits a significant increase in transcriptional activities of antioxidant proteins thioredoxin and peroxiredoxin-6, but accompanied by a concomitant decrease of antioxidant protein heme oxygenase-1. Further studies showed that cyclooxygenase-2, a pro-inflammatory protein related to oxidative stress, is up-regulated while anti-inflammatory protein peroxisome proliferator-activated receptor-γ, an important mediator in vascular functional regulation, is down-regulated in CSFV NS5A expressing cells. This study suggested that CSFV NS5A plays important roles in the induction of oxidative stress and inflammatory response in vascular endothelial cells. These findings provide novel information on the function of the poorly characterized CSFV NS5A and provide an insight into the mechanism by which CSFV NS5A can alter intracellular events associated with the viral infection.

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Acknowledgments

This study was supported by the National Natural Science Foundation of China (No. 31172339). We express our appreciation to Ph.D. Wu-long Liang, Kai Kang, Da-hui Wang for their technical assistance and to Elizabeth Anderson for her help in editing this article.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. College of Veterinary Medicine, Northwest A & F University, Yangling, 712100, Shaanxi, China

    Lei He, Yan-ming Zhang, Zhi Lin, Wei-wei Li, Jing Wang & He-Lin Li

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  1. Lei He
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Correspondence to Yan-ming Zhang.

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He, L., Zhang, Ym., Lin, Z. et al. Classical swine fever virus NS5A protein localizes to endoplasmic reticulum and induces oxidative stress in vascular endothelial cells. Virus Genes 45, 274–282 (2012). https://doi.org/10.1007/s11262-012-0773-2

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  • DOI: https://doi.org/10.1007/s11262-012-0773-2

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