Identification of an Edwardsiella tarda surface antigen and analysis of its immunoprotective potential as a purified recombinant subunit vaccine and a surface-anchored subunit vaccine expressed by a fish commensal strain

文献类型： 外文期刊

第一作者： Sun, Yun

作者： Sun, Yun;Liu, Chun-sheng;Sun, Li;Sun, Yun;Liu, Chun-sheng

作者机构：

关键词： Edwardsiella tarda;Antigen;Subunit vaccine;Surface display

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： 2010 年 28 卷 40 期

页码：

收录情况： SCI

摘要： Edwardsiella tarda is the etiological agent of edwardsiellosis, a systematic disease that affects a wide range of marine and freshwater fish cultured worldwide. In order to identify E. tarda antigens with vaccine potential, we in this study conducted a systematic search for E. tarda proteins with secretion capacity. One of the proteins thus identified was Esa1, which contains 795 amino acid residues and shares extensive overall sequence identities with the D15-like surface antigens of several bacterial species. In silico analyses indicated that Esa1 localizes to outer membrane and possesses domain structures that are conserved among bacterial surface antigens. The vaccine potential of purified recombinant Esa1 was examined in a Japanese flounder (Paralichthys olivaceus) model, which showed that fish vaccinated with Esa1 exhibited a high level of survival and produced specific serum antibodies. Passive immunization of naive fish with antisera raised against Esa1 resulted in significant protection against E. tarda challenge. Taking advantage of the secretion capacity of Esa1 and the natural gut-colonization ability of a fish commensal strain, we constructed an Esa1-expressing recombinant strain, FP3/pJsa1. Western immunoblot and agglutination analyses showed that FP3/pJsa1 produces outer membrane-localized Esa1 and forms aggregates in the presence of anti-Esa1 antibodies. Vaccination analyses showed that FP3/pJsa1 as an intraperitoneal injection vaccine and an oral vaccine embedded in alginate microspheres produced relative percent survival rates of 79% and 52%, respectively, under severe challenging conditions that resulted in 92-96% mortality in control fish. Further analyses showed that following oral vaccination, FP3/pJsa1 was able to colonize in the gut but unable to disseminate into other tissues. Together these results indicate that Esa1 is a protective immunogen and an effective oral vaccine when delivered by FP3/pJsa1 as a surface-anchored antigen. (c) 2010 Elsevier Ltd. All rights reserved.

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