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Broad neutralization activity against both PRRSV-1 and PRRSV-2 and enhancement of cell mediated immunity against PRRSV by a novel IgM monoclonal antibody.
Antiviral Research ( IF 4.5 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.antiviral.2020.104716
Chunyan Wu 1 , Guoqian Gu 1 , Tianshu Zhai 1 , Yajing Wang 1 , Yongling Yang 2 , Yafei Li 1 , Xu Zheng 1 , Qin Zhao 1 , En-Min Zhou 1 , Yuchen Nan 1
Affiliation  

Porcine reproductive and respiratory syndrome (PRRS) is the most economically important infectious disease affecting the global swine industry, especially since vaccination has had limited impact on PRRSV prevention and control. In this study, the monoclonal antibody PR5nf1 (Mab-PR5nf1, IgM isotype) was shown to react with heterogeneous PRRSV isolates belonging to both PRRSV-1 and PRRSV-2 species. Pepsin digestion of Mab-PR5nf1 did not affect Mab binding to virions, as F(ab)2 fragments demonstrated the same reactivity as undigested Mab. Upon further investigation, Mab-PR5nf1 could neutralize all tested PRRSV isolates of both PRRSV-1 and PRRSV-2, suggesting it was a broadly neutralizing Mab against PRRSV. Interestingly, Mab-PR5nf1 appeared to recognize a specific virus epitope that required post-translational modification within the host cellular Golgi apparatus. Deglycosylation of PRRSV virions with PNGase F abolished Mab binding, suggesting that a novel Mab-binding epitope may exist that confers cross-protection against isolates of both PRRSV species. Additionally, immunization of mice with a cocktail of inactivated PRRSV virus and Mab-PR5nf1 enhanced cell-mediated immunity, as determined by IFN-γ ELIspot. In conclusion, this is the first report describing a novel Mab that recognizes a conserved epitope common to both PRRSV-1 and PRRSV-2 and provides valuable insights to guide future PRRSV vaccine development.

中文翻译:

新型IgM单克隆抗体对PRRSV-1和PRRSV-2均具有广泛的中和活性,并增强了细胞介导的针对PRRSV的免疫力。

猪繁殖与呼吸综合征(PRRS)是影响全球养猪业的最经济重要的传染病,尤其是由于疫苗接种对PRRSV的预防和控制影响有限。在这项研究中,单克隆抗体PR5nf1(Mab-PR5nf1,IgM同种型)显示出与属于PRRSV-1和PRRSV-2物种的异源PRRSV分离物反应。Mb-PR5nf1的胃蛋白酶消化不会影响Mab与病毒体的结合,因为F(ab)2片段显示出与未消化的Mab相同的反应性。经过进一步调查,Mab-PR5nf1可以中和PRRSV-1和PRRSV-2的所有测试PRRSV分离株,表明它是针对PRRSV的广泛中和的Mab。有趣的是 Mab-PR5nf1似乎可以识别宿主细胞高尔基体中需要翻译后修饰的特定病毒表位。PRNG病毒PNGase F的去糖基化取消了单克隆抗体的结合,这表明可能存在一种新型的单克隆抗体结合表位,赋予交叉保护作用以对抗两种PRRSV菌种的分离。此外,用灭活的PRRSV病毒和Mab-PR5nf1的混合物对小鼠进行免疫,可以增强细胞介导的免疫力,如IFN-γELIspot所确定。总之,这是第一份描述新型单克隆抗体的报告,该单克隆抗体可识别PRRSV-1和PRRSV-2共有的保守表位,并为指导未来PRRSV疫苗的开发提供有价值的见解。提示可能存在新的Mab结合表位,赋予交叉保护以对抗两种PRRSV物种的分离物。此外,用灭活的PRRSV病毒和Mab-PR5nf1的混合物免疫小鼠,可增强细胞介导的免疫力,如IFN-γELIspot所确定。总之,这是第一份描述新型单克隆抗体的报告,该单克隆抗体可识别PRRSV-1和PRRSV-2共有的保守表位,并为指导未来PRRSV疫苗的开发提供有价值的见解。提示可能存在新的Mab结合表位,赋予交叉保护以对抗两种PRRSV物种的分离物。此外,用灭活的PRRSV病毒和Mab-PR5nf1的混合物免疫小鼠,可增强细胞介导的免疫力,如IFN-γELIspot所确定。总之,这是第一份描述新型单克隆抗体的报告,该单克隆抗体可识别PRRSV-1和PRRSV-2共有的保守表位,并为指导未来PRRSV疫苗的开发提供有价值的见解。
更新日期:2020-01-23
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