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Comparative study of the immune effect of an Edwardsiella tarda antigen in two forms: Subunit vaccine vs DNA vaccine

文献类型： 外文期刊

作者： Sun, Yun 1 ; Liu, Chun-Sheng 3 ; Sun, Li 1 ;

作者机构： 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China

2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

3.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao 266071, Peoples R China

关键词： IgM: immunoglobulin M;plasmid;IL-1-beta: interleukin-1-beta;antigen;interferon;complement C3: 80295-41-6;CD8-alpha;antibody: production;Mx protein;Eta2;outer membrane protein chaperone;interferon-induced Mx protein;natural killer cell enhancing factor;MHC-I-alpha;recombinant Eta2 subunit vaccine: rEta2;antibacterial-drug;antiinfective-drug;vaccine;plasmid Eta2 DNA vaccine: pCEta2;antibacterial-drug;antiinfective-drug;vaccine;immune response;humoral response;immunity;passive immunoprotection

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

ISSN：

年卷期：

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收录情况： SCI

摘要： Edwardsiella tarda is a Gram-negative bacterial pathogen and the etiological agent of a systematic fish disease called edwardsiellosis, which affects a wide range of marine and freshwater fish. E. tarda vaccines in various forms have been reported by a number of research groups; however, comparative studies on the immune mechanisms of these vaccines are lacking. In this report, we identified a new E. tarda vaccine candidate, Eta2, and analyzed in a comparative manner the immune response induced by Eta2 in two different forms: purified recombinant subunit vaccine and DNA vaccine. Eta2 is a protein of 178 residues and shares high levels of sequence identities with the OmpH family of outer membrane protein chaperones of several bacterial species. Recombinant Eta2 (rEta2) purified from Escherichia coli was highly protective against E. tarda challenge in a Japanese flounder (Paralichthys olivaceus) model and produced relative percent of survival rates of 83% and 78%, respectively, at 4- and 8-week post-vaccination (p.v.). Eta2 as a DNA vaccine in the form of plasmid pCEta2 also induced strong protective immunity at 4- and 8-week p.v. Immunological analysis indicated that (i) rEta2 and pCEta2 enhanced head kidney macrophage activation at 1- and, for pCEta2, 7-day p.v.; (ii) rEta2 and pCEta2 induced similar patterns of serum antibody production, however, the antibodies induced by rEta2 were of much higher levels and afforded stronger passive immunoprotection upon naive flounder than those induced by pCEta2; (iii) both rEta2 and pCEta2 upregulated the expression of specific and nonspecific immune factors which include, in the case of pCEta2 but not rEta2, interferon, interferon-induced Mx protein, and CD8 alpha; however, the induction patterns effected by rEta2 and pCEta2 were different. While high levels of interleukin 1 beta (IL-1 beta), natural killer cell enhancing factor, Mx, MHC 1 alpha, and IgM inductions were observed in pCEta2-vaccinated fish, only IL-1 beta, complement C3, and IgM inductions were highly induced in rEta2-vaccinated fish. Taken together, these results indicate that both rEta2 and pCEta2 induce specific and nonspecific immunities, however, pCEta2 induces both B cell and T cell responses, whereas rEta2 induces mainly humoral response

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