抗石斑鱼虹彩病毒药物的体外筛选

In vitro screening of drugs against Singapore grouper iridovirus(SGIV)

  • 摘要: 【目的】体外筛选抗石斑鱼虹彩病毒(Singapore grouper iridovirus,SGIV)的药物,为石斑鱼虹彩病毒病防控提供理论依据。【方法】应用石斑鱼脾脏组织细胞系(Grouper spleen,GS)-SGIV感染模型,从4种药物盐酸金刚烷胺(AMA)、更昔洛韦(GCV)、绿原酸(CGA)和黄芩苷(BI)中筛选有效的体外抗SGIV药物。通过显微镜观察和细胞活力检测不同药物对GS细胞的毒性,确定不同药物对GS细胞的安全工作浓度后,通过实时荧光定量PCR、蛋白印迹分析等探究药物对SGIV感染复制的调节作用。【结果】细胞活力检测结果显示,4种药物AMA、GCV、CGA和BI处理GS细胞的最高安全工作浓度分别为200、200、1600和40μg/mL。显微镜下观察发现,AMA和GCV处理GS细胞后对SGIV感染的细胞病变效应(Cytopathic effect,CPE)进程有明显的抑制作用,而CGA和BI没有明显抑制效果。实时荧光定量PCR检测结果显示,AMA和GCV处理可显著降低SGIV主要衣壳蛋白(Major capsid protein,MCP)和病毒囊膜蛋白(Viral protein VP088)的基因转录(P<0.05,下同)。蛋白印迹分析表明AMA和GCV对SGIV的MCP蛋白合成具有明显抑制效果。倒置荧光显微镜观察发现AMA和GCV处理明显减少感染过程中病毒加工厂的形成,提示AMA和GCV可能影响病毒装配。病毒滴度测定结果显示,AMA和GCV处理可显著降低SGIV感染过程中子代病毒的产量。【结论】应用SGIV体外感染模型筛选到的2种药物AMA和GCV具有一定的抗SGIV活性,且这种抗病毒能力主要通过抑制病毒的基因转录和蛋白合成,从而影响病毒的装配和产量。

     

    Abstract: 【Objective】The purpose of the study was to screen drugs against Singapore grouper iridovirus(SGIV) in vitro and to provide theoretical basis for the prevention and control of Singapore grouper iridoviral diseases.【Method】The effective in vitro drugs against SGIV were screened using a model of grouper spleen(GS) tissue cell line-SGIV infection from four drugs amantadine hydrochloride(AMA), ganciclovir(GCV), chlorogenic acid(CGA) and baicalin(BI).The toxicity of different drugs on GS cells was determined by microscopic observation and cell viability assay. After determining the safe working concentrations of different drugs on GS cells,the regulatory effects of the drugs on SGIV infection and replication were further explored using real-time fluorescence quantitative PCR, protein blotting and other tests.【Result】The results of cell viability assay showed that the highest safe working concentrations of the four drugs AMA, GCV, CGA and BI on GS cells were 200, 200, 1600 and 40 μg/mL, respectively. Microscopic observation indicated that AMA and GCV treatment of cells had obvious inhibitory effect on the cytopathic effect(CPE) process of SGIV infection, whereas CGA and BI did not have obvious inhibitory effect. Fluorescence quantitative PCR analysis showed that AMA and GCV treatments significantly reduced the gene transcription of major capsid protein(MCP) and viral protein VP088of SGIV. Protein blotting analysis showed that AMA and GCV had obvious inhibitory effects on the MCP protein synthesis of SGIV. Inverted fluorescence microscopy observation revealed that AMA and GCV treatments greatly reduced the formation of viral processing factories during infection, suggesting that AMA and GCV might affect viral assembly. The results of viral titer assays showed that AMA and GCV treatments significantly reduced the progeny virus production during SGIV infection(P<0.05). 【Conclusion】AMA and GCV,two drugs screened by applying the SGIV in vitro infection model, have certain anti-SGIV activity, and this antiviral ability mainly affects virus assembly and production by inhibiting gene transcription and protein synthesis of the virus.

     

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