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Analysis of immunogenicity of minor envelope protein GP3 of porcine reproductive and respiratory syndrome virus in mice

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Abstract

Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most economically significant viral diseases in swine industry. Though the minor envelope protein GP3 is associated with protective immunity, its immunogenicity and protective mechanism are poorly known. In this study, two recombinant adenoviruses, rAd-GP3 expressing complete GP3 and rAd-tGP3 expressing truncated GP3 in which aa2-64 were deleted, were constructed and the immunogenicity were tested in a mouse model. Four groups of BALB/c mice were immunized subcutaneously twice at 2-week internals with the recombinants rAd-GP3 and rAd-tGP3 or with wild type adenovirus (wtAd) and PBS as control. The results showed that the mice immunized with recombinant adenoviruses developed PRRSV-specific neutralizing antibodies and cellular immune response, including T-cell proliferation responses and cytotoxic T responses, by 2 weeks post-primary immunization. Moreover, the levels of immune responses of mice immunized with rAd-tGP3 were significantly higher than that of mice with rAd-GP3. It indicated that the first 64aa fragment of GP3 might affect the conformation of the antigen structures of GP3 protein. GP3 protein should be one of candidate molecules for developing a new safer effective vaccine.

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Acknowledgments

This work was supported by Program for New Century Excellent Talents in University (NCET-04-0502), and grants from the National Natural Science Foundation (30270990, 30471288), Jiangsu Province Natural Science Foundation (BK2005093), and partly the Key Project of Chinese Ministry of Education (104101).

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Correspondence to Ping Jiang.

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Jiang, W., Jiang, P., Li, Y. et al. Analysis of immunogenicity of minor envelope protein GP3 of porcine reproductive and respiratory syndrome virus in mice. Virus Genes 35, 695–704 (2007). https://doi.org/10.1007/s11262-007-0143-7

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  • DOI: https://doi.org/10.1007/s11262-007-0143-7

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