Protective immunity against infectious spleen and kidney necrosis virus induced by immunization with DNA plasmid containing mcp gene in Chinese perch Siniperca chuatsi

文献类型： 外文期刊

第一作者： Fu, Xiaozhe

作者： Fu, Xiaozhe;Li, Ningqiu;Lin, Qiang;Guo, Huizhi;Zhang, Defeng;Liu, Lihui;Wu, Shuqin;Fu, Xiaozhe;Li, Ningqiu;Lin, Qiang;Zhang, Defeng;Liu, Lihui;Wu, Shuqin

作者机构：

关键词： Siniperca chuatsi;Infectious spleen and kidney necrosis virus;Major capsid protein;DNA vaccine

期刊名称：FISH & SHELLFISH IMMUNOLOGY （ 影响因子：4.581； 五年影响因子：4.851 ）

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收录情况： SCI

摘要： Infectious spleen and kidney necrosis virus (ISKNV) is the causative agent of a disease leading to high mortality and economic losses in Chinese perch, Siniperca chuatsi. There is an urgent need to develop an effective vaccine against this fatal disease. In this study, the mcp gene encoding the major capsid protein, the predominant structural component of the iridovirus particles, was cloned into a eukaryotic expression vector pcDNA3.1+, and the recombinant plasmid, designated as pcMCP, was constructed. Expression of the mcp gene was confirmed in transfected cells and muscle tissues of vaccinated fish by RT-PCR, immunodot blot and western blot. Immune response was induced by intramuscular injection of Chinese perch with pcMCP added QCDC adjuvant. The expression levels of type I IFN system genes including IRF-7, IRAK1, Mx and Viperin were up-regulated at 6 h, and reached a peak at 48 h. In addition, there was a second peak of the expression levels of IRF-7 and Mx gene on the 21st day post-vaccination. Before the 21st day post-vaccination, the levels of IgM did not show a significant difference among all groups, but there was a remarkable increase on the 28th day post-vaccination. The relative percent survival (RPS) of Chinese perch vaccinated with pcMCP added QCDC adjuvant was 80% in a challenge trial on the 28th day post-vaccination. Moreover, real-time PCR demonstrated that the levels of viral load in the dead fish of the vaccinated group were significantly higher than those in mock-vaccinated fish. Together, these results indicate that pcMCP is a potential candidate DNA vaccine against ISKNV disease

分类号： S9

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