Abstract
DNA vaccine candidates for foot-and-mouth disease (FMD) were engineered to produce FMD virus (FMDV) particles that were noninfectious in cell culture or animals. The prototype plasmid, pWRM, contains a cytomegalovirus immediate-early promoter-driven genome-length type A12 cDNA followed by the bovine growth hormone polyadenylation site. BHK cells transfected with this plasmid produced virus, but the specific infectivity of pWRM was much lower than that achieved with in vitro-generated RNA genomes. To improve the infectivity of the plasmid, a cDNA encoding the hepatitis delta virus ribozyme was added to the 3' end of the FMDV cDNA. The resulting plasmid, pWRMH, exhibited slightly increased infectivity in cell culture and produced virus when inoculated into suckling mice. A third plasmid, pWRMHX, was created by removal of the sequences encoding the cell binding site found in capsid protein VP1 of pWRMH. Although cells transfected with pWRMHX produced viral capsids, this plasmid was not lethal in suckling mice, indicating that particles lacking the cell binding site were not able to initiate secondary infectious cycles. Swine inoculated with pWRMHX did not show any signs of disease and produced neutralizing antibodies to FMDV, and 20% of the vaccinated animals were protected from challenge. A derivative of pWRMHX, pWRMHX-pol-, harboring a mutation designed to inactivate the viral polymerase was much less immunogenic, indicating that immunogenicity of pWRMHX resulted, in part, from amplification of the viral genome in the animal.
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