A novel alphavirus replicon-vectored vaccine delivered by adenovirus induces sterile immunity against classical swine fever

文献类型： 外文期刊

第一作者： Sun, Yuan

作者： Sun, Yuan;Li, Hong-Yu;Tian, Da-Yong;Han, Qiu-Ying;Zhang, Xin;Li, Na;Qiu, Hua-Ji

作者机构：

关键词： Classical swine fever;Recombinant adenovirus;Alphavirus replicon;Chimeric vector;Vaccine;Sterile immunity

期刊名称：VACCINE （ 影响因子：3.641； 五年影响因子：3.816 ）

ISSN： 0264-410X

年卷期： 2011 年 29 卷 46 期

页码：

收录情况： SCI

摘要： Low efficacy of gene-based vaccines due to inefficient gene delivery and expression has been major bottleneck of their applications. Efforts have been made to improve the efficacy, such as gene gun and electroporation, but the strategies are difficult to put into practical use. In this study, we developed and evaluated an adenovirus-delivered, alphavirus replicon-vectored vaccine (chimeric vector-based vaccine) expressing the E2 gene of classical swine fever virus (CSFV) (rAdV-SFV-E2). Rabbits immunized with rAdV-SFV-E2 developed CSFV-specific antibodies as early as 9 days and as long as 189 days and completely protected from challenge with C-strain. Pigs immunized with rAdV-SFV-E2 (n = 5) developed robust humoral and cell-mediated responses to CSFV and were completely protected from subsequent lethal CSFV infection clinically and virologically. The level of immunity and protection induced by rAdV-SFV-E2 was comparable to that provided by the currently used live attenuated vaccine, C-strain. In contrast, both the conventional alphavirus replicon-vectored vaccine pSFV1CS-E2 and conventional adenovirus-vectored vaccine rAdV-E2 provided incomplete protection. The chimeric vector-based vaccine represents the first gene-based vaccine that is able to confer sterile immunity and complete protection against CSFV. The new-concept vaccination strategy may also be valuable in vaccine development against other pathogens. (C) 2011 Elsevier Ltd. All rights reserved.

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