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Co-immunisation with a plasmid DNA cocktail primes mice against anthrax and plague

Williamson, E. D., Bennett, A. M., Perkins, S. D., Beedham, R. J., Miller, J. and Baillie, Les 2002. Co-immunisation with a plasmid DNA cocktail primes mice against anthrax and plague. Vaccine 20 (23-24) , pp. 2933-2941. 10.1016/S0264-410X(02)00232-3

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The protective antigen (PA) of Bacillus anthracis and the V antigen of Yersinia pestis are potent immunogens and candidate vaccine sub-units. When plasmid DNA encoding either PA or V antigen was used to immunise the Balb/c mouse, a low serum IgG titre was detected (log 10 1.0 or less) which was slightly increased by boosting with plasmid DNA. However, when mice immunised with plasmid DNA were later boosted with the respective recombinant protein, a significant increase in titre (up to 100-fold) was observed. Mice primed with a combination of each plasmid and boosted with a combination of the recombinant proteins, were fully protected (6/6) against challenge with Y. pestis. This compared favourably with mice primed only with plasmid DNA encoding the V antigen and boosted with rV, which were partially protected (3/6) against homologous challenge or with mice primed and boosted with plasmid DNA encoding the V antigen which were poorly protected (1/6). Combined immunisation with the two plasmid DNA constructs followed by boosting with a combination of the encoded recombinant proteins enhanced the protective immune response to Y. pestis compared with priming only with plasmid DNA encoding the V antigen and boosting with rV. This enhancement may be due to the effect of CpG motifs known to be present in the plasmid DNA construct encoding PA.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Subjects: R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords: DNA vaccines; Plague; Anthrax; Protective efficacy
Publisher: Elsevier
ISSN: 0264-410X
Last Modified: 04 Jun 2017 03:09

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