Expression of the VP1 protein of FMDV integrated chromosomally with mutant Listeria monocytogenes strain induced both humoral and cellular immune responses

文献类型： 外文期刊

第一作者： Mahdy, S. E.

作者： Mahdy, S. E.;Liu, Sijing;Su, Lin;Zhang, Xiang;Pei, Xiaofang;Wang, Chuan;Mahdy, S. E.;Liu, Sijing;Su, Lin;Zhang, Xiang;Pei, Xiaofang;Wang, Chuan;Mahdy, S. E.;Liu, Sijing;Su, Lin;Zhang, Xiang;Pei, Xiaofang;Wang, Chuan;Chen, Haotai

作者机构：

关键词： FMD; Listeria; Vector vaccine; Recombinant; VP1

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

ISSN： 0175-7598

年卷期： 2019 年 103 卷 4 期

页码：

收录情况： SCI

摘要： Live vector-based vaccine is a modern approach to overcome the drawbacks of inactivated foot-and-mouth disease (FMD) vaccines such as improper inactivation during manufacture. Listeria monocytogenes (LM), an intracellular microorganism with immune-stimulatory properties, is appropriate to be utilized as a live bacterial vaccine vector. FMDV-VP1 protein has the capability to induce both cellular and humoral immune responses since it is considered the most immunogenic part of FMDV capsid and has the most of antigenic sites for viral neutralization. The codon-optimized vp1 gene was ligated to the integrative pCW702 plasmid to construct the target cassette. The antigen cassette was integrated successfully into the chromosome of mutant LM strain via homologous recombination for more stability to generate a candidate vaccine strain LMoactAplcB-vp1. Safety evaluation of recombinant LMoactAplcB-vp1 revealed it could be eliminated from the internal organs within 3days as a safe candidate vaccine. Mice groups were immunized I.V. twice with the recombinant LMoactAplcB-vp1 at an interval of 2weeks. Antigen-specific IgG antibodies and the level of CD4+- and CD8+-specific secreted cytokines were estimated to evaluate the immunogenicity of the candidate vaccine. The rapid onset immune response was detected, strong IgG humoral immune response within 14days post immunization and augmented again after the booster dose. Cellular immunity data after 9days post the prime dose indicated elevation in CD4+ and CD8+ secreted cytokine level with another elevation after the booster dose. This is the first report to explain the ability of attenuated mutant LM to be a promising live vector for FMDV vaccine.

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