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The Antimalaria Drug Artesunate Inhibits Porcine Reproductive and Respiratory Syndrome Virus Replication by Activating AMPK and Nrf2/HO-1 Signaling Pathways

文献类型： 外文期刊

作者： Feixiang Long;Mingxin Zhang;Xia Yang;Xiaohuan Liang;Lizhan Su;Tongqing An;Guihong Zhang;Zhenling Zeng;Yahong Liu;Weisan Chen;Jianxin Chen

作者机构：

关键词： AMPK;Artesunate (AS);Inhibitor;Nrf2/HO-1;Porcine reproductive and respiratory syndrome virus (PRRSV)

期刊名称： Journal of Virology

ISSN： 0022-538X

年卷期： 2022 年 96 卷 3 期

页码：

收录情况： SCIE（2022版）

摘要： Porcine reproductive and respiratory syndrome virus (PRRSV) causes significant economic losses to the pork industry worldwide. Currently, vaccine strategies provide limited protection against PRRSV transmission, and no effective drug is commercially available. Therefore, there is an urgent need to develop novel antiviral strategies to prevent PRRSV pandemics. This study showed that artesunate (AS), one of the antimalarial drugs, potently suppressed PRRSV replication in Marc-145 cells and ex vivo primary porcine alveolar macrophages (PAMs) at micromolar concentrations. Furthermore, we demonstrated that this suppression was closely associated with AS-activated AMPK (energy homeostasis) and Nrf2/HO-1 (inflammation) signaling pathways. AS treatment promoted p-AMPK, Nrf2, and HO-1 expression and, thus, inhibited PRRSV replication in Marc-145 and PAM cells in a time- and dose-dependent manner. These effects of AS were reversed when the AMPK or HO-1 gene was silenced by short interfering RNA. In addition, we demonstrated that AMPK works upstream of Nrf2/HO-1, as its activation by AS is AMPK dependent. Adenosine phosphate analysis showed that AS activates AMPK via improving the AMP/ADP-to-ATP ratio rather than direct interaction with AMPK. Altogether, our findings indicate that AS is a promising novel therapeutic for controlling PRRSV and that its anti-PRRSV mechanism, which involves the functional link between energy homeostasis and inflammation suppression pathways, may provide opportunities for developing novel antiviral agents. IMPORTANCE Porcine reproductive and respiratory syndrome virus (PRRSV) infections have continuously threatened the pork industry worldwide. Vaccination strategies provide very limited protection against PRRSV infection, and no effective drug is commercially available. We show that artesunate (AS), one of the antimalarial drugs, is a potent inhibitor against PRRSV replication in Marc-145 cells and ex vivo primary porcine alveolar macrophages (PAMs). Furthermore, we demonstrate that AS inhibits PRRSV replication via activation of AMPK-dependent Nrf2/HO-1 signaling pathways, revealing a novel link between energy homeostasis (AMPK) and inflammation suppression (Nrf2/HO-1) during viral infection. Therefore, we believe that AS may be a promising novel therapeutics for controlling PRRSV, and its anti-PRRSV mechanism may provide a strategy to develop novel antiviral agents.

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