Publication:
In vitro and in vivo stability of recombinant plasmids in a vaccine strain of Salmonella enterica var. Typhimurium

dc.contributor.author Simmons, Cameron
dc.date.accessioned 2018-09-14T11:14:51Z
dc.date.available 2017-07-19T01:59:42Z
dc.date.available 2018-09-14T11:14:51Z
dc.date.issued 2003-07-15 en_US
dc.description.abstract This study examined the ability of different plasmid vectors encoding H(C) fragment, the non-toxic binding portion of tetanus toxin, to be stably retained by Salmonella enterica var. Typhimurium (Salmonella typhimurium) vaccine strain BRD509 and, upon immunisation, to induce an antibody response against the carried antigen. The H(C) fragment expression cassette containing the transcription/translation signals, H(C) fragment open reading frame and the downstream TrpA terminator, was excised from pTETtac4 and incorporated into the plasmids pIC20H, pBR322, pACYC184 and pRSF1010. The resulting constructs were transferred into attenuated S. typhimurium, BRD509, and the level of H(C) fragment expression was examined by Western blot analysis. The relative stability of each plasmid in S. typhimurium was determined in vitro in the absence of antibiotic selection, and in vivo following immunisation. The ability of each H(C) fragment-expressing strain to induce lipopolysaccharide- and tetanus toxoid-specific antibody responses was assayed by an enzyme-linked immunosorbent assay. These studies showed that all the vaccine vector constructs, except the S. typhimurium carrying the expression vector based on pIC20H, were able to elicit a high titre immune response. The level of tetanus toxoid-specific antibody induced by S. typhimurium directly correlated with the level of in vitro and in vivo stability of the H(C) fragment expression plasmid carried by the bacterium, and not with an increased copy number of the parent plasmid vector.
dc.identifier.uri https://demo7.dspace.org/handle/123456789/80
dc.language English en_US
dc.title In vitro and in vivo stability of recombinant plasmids in a vaccine strain of Salmonella enterica var. Typhimurium en_US
dc.type Journal Article
dspace.entity.type Publication
relation.isAuthorOfPublication b1b2c768-bda1-448a-a073-fc541e8b24d9
Files
Collections