A plasmid encoding Japanese encephalitis virus PrM and E proteins elicits protective immunity in suckling mice |
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Authors: | Wu Yushui Zhang Fuquan Ma Wenyu Song Jianhua Huang Qingsheng Zhang Hongyi |
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Affiliation: | Department of Microbiology, Fourth Military Medical University, Xi'an 710032, Shaanxi Province, China. |
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Abstract: | A plasmid encoding Japanese encephalitis virus (JEV) prM and E proteins was constructed, and its efficacy as a candidate vaccine against JEV was evaluated in suckling mice. Groups of 10 BALB/c mice (5-7 days old) were immunized twice via muscular injection with this DNA vaccine, an empty vector or PBS at an interval of 3 weeks, and were challenged with a lethal dose of JEV 3 weeks after the second inoculation. Both cellular and humoral immune responses were examined before the challenge. Two animals from each group were sacrificed to detect the JEV-specific cytotoxic T lymphocyte activity. JEV-specific lactate dehydrogenase release in the DNA vaccine, empty vector and PBS groups was 37.5%, 18% and 8.5% respectively. JEV-specific antibody was detected in 8 of 10 animals in DNA vaccine group with a geometrical mean titer of 1: 28.3. The pooled serum from the same group also showed a neutralizing activity. Six of 8 mice in the DNA vaccine group survived the challenge, with a protection rate of 75%, but all the mice died in the two control groups. These results show that this JEV prM and E DNA vaccine is immunogenic and protective against JEV infection in the mouse model. |
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Keywords: | E protein japanese encephalitis virus DNA vaccine immunization |
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