Enhanced immunogenicity in the murine airway mucosa with an attenuated Salmonella live vaccine expressing OprF-OprI from Pseudomonas aeruginosa.
We constructed an oral live vaccine based on the attenuated aroA mutant Salmonella enterica serovar Typhimurium strain SL3261 expressing outer membrane proteins F and I (OprF-OprI) from Pseudomonas aeruginosa and investigated it in a mouse model. Strains with in vivo inducible protein expression with the PpacC promoter showed good infection rates and immunogenicity but failed to engender detectable antibodies in the lung. However, a systemic booster vaccination following an oral primary immunization yielded high immunoglobulin A (IgA) and IgG antibody levels in both upper and lower airways superior to conventional systemic or mucosal booster vaccination alone. In addition, the proportion of IgG1 and IgG2a antibodies suggested that the systemic booster does not alter the more TH1-like type of response induced by the oral Salmonella primary vaccination. We conclude that an oral primary systemic booster vaccination strategy with an appropriate mucosal vector may be advantageous in diseases with the risk of P. aeruginosa airway infection, such as cystic fibrosis.
Arnold
Heinz
H
Department of Pediatric Pulmonology and Neonatology, Hannover Medical School, 30623, Germany.
Bumann
Dirk
D
Felies
Melanie
M
Gewecke
Britta
B
Sörensen
Meike
M
Gessner
J Engelbert
JE
Freihorst
Joachim
J
von Specht
Bernd Ulrich
BU
Baumann
Ulrich
U
D000284:Administration, Oral; D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis / Q000097:blood; D001426:Bacterial Proteins / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D001428:Bacterial Vaccines / Q000235:genetics / Q000276:immunology*; D006801:Humans; D018928:Immunity, Mucosal; D008074:Lipoproteins / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018272:Porins / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D011552:Pseudomonas Infections / Q000517:prevention & control; D011550:Pseudomonas aeruginosa / Q000276:immunology*; D011993:Recombinant Fusion Proteins / Q000276:immunology / Q000378:metabolism; D020545:Respiratory Mucosa / Q000276:immunology*; D012486:Salmonella typhimurium / Q000235:genetics* / Q000276:immunology; D014611:Vaccination; D014613:Vaccines, Attenuated / Q000235:genetics / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology
D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D001428:Bacterial Vaccines; D008074:Lipoproteins; D018272:Porins; D011993:Recombinant Fusion Proteins; D014613:Vaccines, Attenuated; D014614:Vaccines, Synthetic; C060507:outer membrane lipoprotein I, Bacteria