Oral immunisation with live aroA attenuated Salmonella enterica serovar Typhimurium expressing the Yersinia pestis V antigen protects mice against plague.
Bubonic and pneumonic plague are caused by the bacterium Yersinia pestis. The V antigen of Y. pestis is a protective antigen against plague. In this study, an aroA attenuated strain of Salmonella enterica serovar Typhimurium (SL3261) has been used to deliver the Y. pestis V antigen as a candidate oral plague vaccine. SL3261 was transformed with the expression plasmid pTrc-LcrV, containing the lcrV gene encoding V antigen. Immunoblot analysis showed V antigen expression in SL3261 in vitro and intragastric immunisation of mice with the recombinant Salmonella resulted in the induction of V antigen-specific serum antibody responses and afforded protection against Y. pestis challenge. However, the antibody responses induced by the recombinant Salmonella did not correlate with the protection afforded, indicating that immune responses other than antibody may play a role in the protection afforded against plague by this candidate vaccine.
Garmory
Helen S
HS
Dstl Chemical and Biological Sciences, Porton Down, Salisbury SP4 0JQ, UK. hsgarmory@dstl.gov.uk
Griffin
Kate F
KF
Brown
Katherine A
KA
Titball
Richard W
RW
D000284:Administration, Oral; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D015153:Blotting, Western; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D007114:Immunization; D051379:Mice; D010930:Plague / Q000276:immunology / Q000517:prevention & control*; D010931:Plague Vaccine / Q000276:immunology*; D052899:Pore Forming Cytotoxic Proteins; D022562:Salmonella Vaccines / Q000008:administration & dosage / Q000276:immunology* / Q000378:metabolism; D012485:Salmonella typhi / Q000276:immunology*; D014436:Typhoid-Paratyphoid Vaccines / Q000008:administration & dosage / Q000276:immunology* / Q000378:metabolism; D014613:Vaccines, Attenuated / Q000008:administration & dosage / Q000276:immunology; D015008:Yersinia enterocolitica / Q000276:immunology*
D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; C043908:LcrV protein, Yersinia; D010931:Plague Vaccine; D052899:Pore Forming Cytotoxic Proteins; D022562:Salmonella Vaccines; D014436:Typhoid-Paratyphoid Vaccines; D014613:Vaccines, Attenuated; C087350:aroA Salmonella vaccine