. doi: 10.1016/j.virs.2024.08.007
Citation: Chongda Luo, Xintong Yan, Shaokang Yang, Sichen Ren, Yan Luo, Jiazheng Li, Ping Wang, Yunfeng Shao, Wei Li, Song Li, Jingjing Yang, Ruiyuan Cao, Wu Zhong. Antiviral activity of vitamin D derivatives against severe fever with thrombocytopenia syndrome virus in vitro and in vivo .VIROLOGICA SINICA, 2024, 39(5) : 802-811.  http://dx.doi.org/10.1016/j.virs.2024.08.007

维生素D类似物在体外和体内对严重发热伴血小板减少综合征的抗病毒活性

cstr: 32224.14.j.virs.2024.08.007
  • 严重发热伴血小板减少综合征病毒(SFTSV)是一种蜱传病毒,可引起严重发热血小板减少综合征,该病主要表现为发热和出血,并可能伴有严重的神经系统症状。目前,尚无批准用于该适应症的特异性抗病毒药物。基于此,我们在本研究中主要关注维生素D类似物是否在体内外水平均可有效抑制SFTSV。体外研究表明,维生素D类似物能够以剂量依赖的方式抑制病毒RNA复制、空斑形成和蛋白质表达。体内研究表明,维生素D类似物度骨化醇和阿尔法骨化醇均可显著提高致死剂量SFTSV感染的ICR乳鼠的存活率,并降低BALB/c成鼠血液中的SFTSV载量。加药时序实验表明,维生素D类似物主要在SFTSV感染的进入后阶段发挥作用。然而,在RIG-I缺陷的Huh7.5细胞中,未观察到维生素D类似物对SFTSV感染引起的细胞病变具有保护作用,同时,服用维生素D类似物并未提高成年A129小鼠的存活率或降低其血液中的病毒载量。进一步,我们利用转录组测序对维生素D类似物的抗病毒机制解析,提示阿法骨化醇可能通过激活宿主天然免疫反应发挥抗病毒作用。为了拓展维生素D类似物的应用范围,我们开展了体内外水平的药物联用实验,结果表明维生素D类似物和T-705在细胞水平具有协同作用,且阿尔法骨化醇和T-705组合物在小鼠中疗效也显著增强。这项研究证实了维生素 D 类似物具有抗SFTSV潜力,并表明它们可能与用于治疗SFTSV感染的其他化合物具有协同作用。

Antiviral activity of vitamin D derivatives against severe fever with thrombocytopenia syndrome virus in vitro and in vivo

  • Severe fever with thrombocytopenia syndrome virus (SFTSV) is a tick-borne virus that causes the severe fever thrombocytopenia syndrome, which manifests as fever and haemorrhage, accompanied by severe neurological complications. To date, no specific antiviral drugs have been approved for this indication. Herein, we investigated whether vitamin D derivatives inhibit SFTSV both in vitro and in vivo. An in vitro study demonstrated that vitamin D derivatives significantly suppressed viral RNA replication, plaque formation, and protein expression in a dose-dependent manner. Subsequently, in vivo studies revealed that doxercalciferol and alfacalcidol were associated with increased survival and reduced viral RNA load in the blood. Time-of-addition assay suggested that vitamin D derivatives primarily acted during the post-entry phase of SFTSV infection. However, cytopathic effect protective activity was not observed in RIG-I immunodeficient cell line Huh7.5, and the administration of vitamin D derivatives did not improve the survival rates or reduce the blood viral loads in adult A129 mice. Further transcriptome exploration into the antiviral mechanism revealed that alfacalcidol stimulates host innate immunity to exert antiviral effects. To expand the application of vitamin D derivatives, in vitro and in vivo drug combination assays were performed, which highlighted the synergistic effects of vitamin D derivatives and T-705 on SFTSV. The combination of alfacalcidol and T-705 significantly enhanced the therapeutic effects in mice. This study highlights the potential of vitamin D derivatives against SFTSV and suggests that they may have synergistic effects with other compounds used in the treatment of SFTSV infection.

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    Antiviral activity of vitamin D derivatives against severe fever with thrombocytopenia syndrome virus in vitro and in vivo

      Corresponding author: Jingjing Yang, yangjingjing@hainanu.edu.cn
      Corresponding author: Ruiyuan Cao, 21cc@163.com
      Corresponding author: Wu Zhong, zhongwu@bmi.ac.cn
    • a. School of Pharmaceutical Sciences, Hainan University, Haikou, 570228, China;
    • b. Song Li's Academician Workstation of Hainan University (School of Pharmaceutical Sciences), Yazhou Bay, Sanya, 572000, China;
    • c. National Engineering Research Center for the Emergency Drug, Beijing Institute of Pharmacology and Toxicology, Beijing, 100850, China

    Abstract: Severe fever with thrombocytopenia syndrome virus (SFTSV) is a tick-borne virus that causes the severe fever thrombocytopenia syndrome, which manifests as fever and haemorrhage, accompanied by severe neurological complications. To date, no specific antiviral drugs have been approved for this indication. Herein, we investigated whether vitamin D derivatives inhibit SFTSV both in vitro and in vivo. An in vitro study demonstrated that vitamin D derivatives significantly suppressed viral RNA replication, plaque formation, and protein expression in a dose-dependent manner. Subsequently, in vivo studies revealed that doxercalciferol and alfacalcidol were associated with increased survival and reduced viral RNA load in the blood. Time-of-addition assay suggested that vitamin D derivatives primarily acted during the post-entry phase of SFTSV infection. However, cytopathic effect protective activity was not observed in RIG-I immunodeficient cell line Huh7.5, and the administration of vitamin D derivatives did not improve the survival rates or reduce the blood viral loads in adult A129 mice. Further transcriptome exploration into the antiviral mechanism revealed that alfacalcidol stimulates host innate immunity to exert antiviral effects. To expand the application of vitamin D derivatives, in vitro and in vivo drug combination assays were performed, which highlighted the synergistic effects of vitamin D derivatives and T-705 on SFTSV. The combination of alfacalcidol and T-705 significantly enhanced the therapeutic effects in mice. This study highlights the potential of vitamin D derivatives against SFTSV and suggests that they may have synergistic effects with other compounds used in the treatment of SFTSV infection.

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