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標題: Yeast expressed classical swine fever E2 subunit vaccine candidate provides complete protection against lethal challenge infection and prevents horizontal virus transmission
作者: Lin, G.J.
Deng, M.C.
Chen, Z.W.
Liu, T.Y.
Wu, C.W.
Cheng, C.Y.
Chien, M.S.
Huang, C.J.
關鍵字: Classical swine fever virus;Yeast expressed E2 protein;Subunit marker;vaccine;Protective immune response;Virus horizontal transmission;hog-cholera virus;envelope glycoprotein-e1;pichia-pastoris;highly;virulent;marker vaccine;insect cells;protein;identification;ribonuclease;antibody
Project: Vaccine
期刊/報告no:: Vaccine, Volume 30, Issue 13, Page(s) 2336-2341.
Classical swine fever (CSF) caused by the classical swine fever virus (CSFV) is a highly contagious swine disease resulting in large economical losses worldwide. The viral envelope glycoprotein E-rns and E2 are major targets for eliciting antibodies against CSFV in infected animals. A Pichia pastoris yeast expressed E2 protein (yE2) has been shown to induce a protective immune response against CSFV challenge. The purpose of this study is to determine the optimal dose of yE2 and its efficacy on the prevention of virus horizontal transmission. A yeast-expressed E-rns (yE(rns)) protein was also included to evaluate its immunogenicity. The yE(rns) vaccinated pigs seroconverted to CSFV-Ems-specific antibody but no neutralizing antibody was detected and none survived after challenge infection, suggesting yE(rns) and yE2 retain correct immunogenicity but only the yE2 is able to induce a protective immune response. All three doses of yE2 (200, 300, and 400 mu g) could elicit high titers of neutralizing antibodies and protective responses after challenge. The yE2/200 group demonstrated a mild fever response but recovered soon, and none of the yE2/300 and yE2/400 pigs became febrile. The optimal dose of yE2 was recommended to be 30014 of the total amount of secreted proteins. In addition, the yE2 vaccine could cross-protect from all three genotypes of viruses. Further, the yE2 vaccine efficacy in preventing virus horizontal transmission was evaluated by cohabitation of unimmunized sentinels 3 days after challenge infection. All the sentinel pigs were alive and had no clinical symptoms confirming yE2 vaccine could confer a protective immune response and prevent horizontal transmission of CSFV. (C) 2012 Elsevier Ltd. All rights reserved.
ISSN: 0264-410X
DOI: 10.1016/j.vaccine.2012.01.051
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