Abstract
Recently, alphavirus replicon-based DNA vaccines, also known as suicidal DNA vaccines, have emerged as an important strategy to enhance the potency of DNA vaccines. In this study, two different types of DNA vaccines encoding the capsid precursor polypeptide (P1) of foot-and-mouth disease virus (FMDV) were constructed and the immunogenicity were investigated and compared in mouse model. The first DNA vaccine, pcDP1, is a conventional plasmid DNA vaccine in which P1 was driven directly by a cytomegalovirus promoter. The second DNA vaccine, pSCAP1, is a Semliki Forest virus (SFV) replicon-based DNA vaccine encoding the same antigen. In vitro expression and characterization indicated that two vaccine vectors could correctly produce the P1 antigen. However, pSCAP1 could induce obvious apoptosis of the transfected cells. After immunization in BALB/c mice, the P1-specific ELISA antibodies, neutralizing antibodies, as well as lymphocyte proliferative responses induced by pSCAP1 were significantly higher than those obtained in mice immunized with pcDP1. Notably, mice immunized with the pSCAP1 had the determined ability of clearing virus in their sera after FMDV challenge. These results indicate that the SFV replicon-based DNA vaccine pSCAP1 are more effective than conventional DNA vaccine and it can be considered a promising approach for the development of a safety and efficacious vaccine against FMDV.
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This work was supported by the National Basic Research Program (973) of China (2005CB523200), the National Sciences Foundation of China (No.30300257), and the Youth Scientist Project of Wuhan City (No.20025001041).
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Yu, X., Xiao, S., Fang, L. et al. Enhanced immunogenicity to food-and-mouth disease virus in mice vaccination with alphaviral replicon-based DNA vaccine expressing the capsid precursor polypeptide (P1). Virus Genes 33, 337–344 (2006). https://doi.org/10.1007/s11262-005-0073-1
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DOI: https://doi.org/10.1007/s11262-005-0073-1