An attenuated EIAV vaccine strain induces significantly different immune responses from its pathogenic parental strain although with similar in vivo replication pattern

文献类型： 外文期刊

第一作者： Lin, Yue-Zhi

作者： Lin, Yue-Zhi;Shen, Rong-Xian;Zhu, Zhen-Ying;Deng, Xi-Lin;Cao, Xue-Zhi;Wang, Xue-Feng;Ma, Jian;Jiang, Cheng-Gang;Zhao, Li-Ping;Lv, Xiao-Ling;Zhou, Jian-Hua;Shao, Yi-Ming

作者机构：

关键词： EIAV;Vaccine;Immune response

期刊名称：ANTIVIRAL RESEARCH （ 影响因子：5.97； 五年影响因子：5.801 ）

ISSN： 0166-3542

年卷期： 2011 年 92 卷 2 期

页码：

收录情况： SCI

摘要： The EIAV (equine infectious anemia virus) multi-species attenuated vaccine EIAV(DLV121) successfully prevented the spread of equine infectious anemia (EIA) in China in the 1970s and provided an excellent model for the study of protective immunity to lentiviruses. In this study, we compared immune responses induced by EIAV(DLV121) to immunity elicited by the virulent EIAV(LN40) strain and correlated immune responses to protection from infection. Horses were randomly grouped and inoculated with either EIAV(DLV121) (Vaccinees, Vac) or a sublethal dose of EIAV(LN40) (asymptomatic carriers, Car). Car horses became EIAV(LN40) carriers without disease symptoms. Two of the four Vac horses were protected against infection and the other two had delayed onset or reduced severity of EIA with a lethal EIAV(LN40) challenge 5.5 months post initial inoculation. In contrast, all three Car animals developed acute EIA and two succumbed to death. Specific humoral and cellular immune responses in both Vac and Car groups were evaluated for potential correlations with protection. These analyses revealed that although plasma viral loads remained between 10(3) and 10(5) copies/ml for both groups before EIAV(LN40) challenge, Vac-treated animals developed significantly higher levels of conformational dependent, Env-specific antibody, neutralizing antibody as well as significantly elevated CD4(+) T cell proliferation and IFN-gamma-secreting CD8(+) T cells than those observed in EIAV(LN40) asymptomatic carriers. Further analysis of protected and unprotected cases in vaccinated horses identified that cellular response parameters and the reciprocal anti-p26-specific antibody titers closely correlated with protection against infection with the pathogenic EIAV(LN40). These data provide a better understanding of protective immunity to lentiviruses. (C) 2011 Elsevier B.V. All rights reserved.

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