Envdiversity-dependent protection of the attenuated equine infectious anaemia virus vaccine

文献类型： 外文期刊

第一作者： Lin, Yuezhi

作者： Lin, Yuezhi;Wang, Xue-Feng;Du, Cheng;Ren, Huiling;Liu, Cong;Zhu, Dantong;Chen, Jie;Na, Lei;Liu, Diqiu;Wang, Xiaojun;Wang, Xue-Feng;Yang, Zhibiao;Wang, Yuhong

作者机构：

关键词： EIAV; env; diversity; immune protection; vaccine; retrovirus

期刊名称：EMERGING MICROBES & INFECTIONS （ 影响因子：7.163； 五年影响因子：7.329 ）

ISSN：

年卷期： 2020 年 9 卷 1 期

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收录情况： SCI

摘要： Lentiviruses harbour high genetic variability for efficient evasion from host immunity. An attenuated equine infectious anaemia (EIA) vaccine was developed decades ago in China and presented remarkably robust protection against EIA. The vaccine was recently proven to have high genomic diversity, particular inenv. However, how and to what extent the highenvdiversity relates to immune protection remains unclear. In this study, we compared immune protections and responses of three groups of horses stimulated by the high-diversity vaccine EIAV_HD, a single molecular clone of the vaccine EIAV_LD with lowenvdiversity, as well as a constructed vaccine strain EIAV_MD with moderateenvdiversity. The disparity of virus-host interactions between threeenvdiversity-varied groups (5 horses in each group) was evaluated using clinical manifestation, pathological scores, andenv-specific antibody. We found the highest titres ofenvantibodies (Abs) or neutralizing Abs (nAbs) in the EIAV_HD group, followed by the EIAV_MD group, and the lowest titres in the EIAV_LD group (P<0.05). The occurrence of disease/death was different between EIAV_HD group (1/0), EIAV_MD (2/2), and EIAV_LD group (4/2). A similarenvdiversity-related linear relationship was observed in the clinical manifestations and pathological changes. This diversity-dependent disparity in changes between the three groups was more distinct after immunosuppression, suggesting thatenvdiversity plays an important role in protection under low host immunocompetence. In summary, inoculation with vaccines with higher genetic diversity could present broader and more efficient protection. Our findings strongly suggest that an abundance of Env antigens are required for efficient protection against lentiviruses.

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