Delivery of a heterologous antigen by a registered Salmonella vaccine (STM1).
STM1 is an aro A(-) attenuated mutant of Salmonella enterica serovar Typhimurium, and is a well-characterised vaccine strain available to the livestock industry for the prevention of salmonellosis in chickens. This strain has potential for heterologous antigen delivery, and here we show that the strain can be used to deliver a model antigen, ovalbumin, to immune cells in vitro and in vivo. Two plasmid constructs expressing the ovalbumin gene were utilised, one of which uses a prokaryotic promoter and the other the CMV promoter (DNA vaccine). In vitro, STM1 carrying ovalbumin-encoding plasmids was able to invade dendritic cells and stimulate a CD8(+) cell line specific for the dominant ovalbumin epitope, SIINFEKL. In vivo, spleen cells were responsive to SIINFEKL after vaccination of mice with ovalbumin-encoding plasmids in STM1, and finally, humoral responses, including IgA, were induced after vaccination.
Department of Biotechnology and Environmental Biology, RMIT University, P.O. Box 71, 3083, Bundoora, Vic., Australia.
Endang W
EW
Bachtiar
Kuo-Ching
KC
Sheng
Theodora
T
Fifis
Anita
A
Gamvrellis
Magdalena
M
Plebanski
Peter J
PJ
Coloe
Peter M
PM
Smooker
D000818:Animals; D000942:Antigens, Bacterial / Q000276:immunology; D001428:Bacterial Vaccines / Q000276:immunology*; D002460:Cell Line; D005822:Genetic Vectors; D066298:In Vitro Techniques; D051379:Mice; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000235:genetics / Q000276:immunology*; D010957:Plasmids / Q000235:genetics*; D012481:Salmonella Infections, Animal / Q000517:prevention & control; D012486:Salmonella typhimurium / Q000276:immunology*
D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D010047:Ovalbumin