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Enhancement of DNA vaccine (P12A3C-pcDNA) efficacy against foot-and-mouth disease by coadministration of interleukin-18-expressing (IL18 pcDNA) plasmid in guinea-pigs

Enhancement of DNA vaccine (P12A3C-pcDNA) efficacy against foot-and-mouth disease by coadministration of interleukin-18-expressing (IL18 pcDNA) plasmid in guinea-pigs

Fems Immunology and Medical Microbiology 60(3): 261-269

ISSN/ISBN: 0928-8244

PMID: 21039923

DOI: 10.1111/j.1574-695x.2010.00739.x

Foot-and-mouth disease (FMD) is a highly contagious disease of cloven-hoofed animals causing considerable economic loss in the affected countries. The presently used tissue-cultured inactivated vaccine protects the vaccinated animals for a short duration of immunity. As one of the approaches to develop alternative vaccines, P12A3C-pcDNA (containing P12A and 3C coding sequences of foot-and-mouth disease virus) and bovine IL18 pcDNA plasmids were constructed and the immune response of these constructs was evaluated when they were coinoculated in guinea-pigs. The humoral response was analyzed using enzyme-linked immunosorbent assay (for levels of IgG1, IgG2) and a serum neutralization test (SNT), and the cellular response using an MTT assay. Significantly higher humoral and cell-mediated immune responses were seen in the P12A3C and the IL-18 coinoculated group than that in P12A3C-pcDNA alone and inactivated virus vaccine inoculated groups. Similarly, a higher population of CD4(+) , CD8(+) and T-helper type 1 (Th1), and Th2 cytokine levels were seen in the former group in comparison with the other groups. P12A3C+IL-18 protected all the six animals when challenged with a homologous virus compared with five and four in an inactivated virus vaccine and the P12A3C-pcDNA groups, respectively. These results have shown that the plasmid encoding for P12A3C-pcDNA, when coinoculated with IL-18, induced higher responses and protected the animals from a virus challenge.

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Accession: 052988019

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