Prime-boost vaccination using cysteine proteinases type I and II of Leishmania infantum confers protective immunity in murine visceral leishmaniasis.
Vaccination with a cocktail of DNA encoding cysteine proteinases has been previously shown to confer protection against experimental cutaneous leishmaniasis (CL). In the present study we test the efficacy of immunization against Leishmania infantum in a murine model of infection, using a prime-boost strategy. BALB/c mice were immunized twice, in a 3 weeks interval, with cocktail of plasmids DNA encoding type I (cpb) and II (cpa) cysteine proteinases. DNA immunization was then followed by a boost with rCPA/rCPB in addition to CpG ODN and Montanide720 as adjuvant. Analysis of the immune response showed that vaccination mainly elicited antigen-specific IgG2a antibodies, suggesting the induction of a Th1 immune response. This was further confirmed by the analysis of the splenic cytokine production: at all time points the ratio of IFN-gamma/IL-5 induced upon restimulation with rCPA and rCPB was always significantly higher in vaccinated group compared to both control groups.
Rafati
Sima
S
Molecular Immunology and Vaccine Research Lab., Pasteur Institute of Iran, P.O. Box 11365-6699, Tehran, Iran. sima-rafatisy@institute.pasteur.ac.ir
Zahedifard
Farnaz
F
Nazgouee
Fereshteh
F
D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D000953:Antigens, Protozoan / Q000008:administration & dosage / Q000276:immunology*; D003546:Cysteine Endopeptidases / Q000008:administration & dosage* / Q000276:immunology; D007115:Immunization Schedule; D007117:Immunization, Secondary; D007074:Immunoglobulin G / Q000097:blood; D018314:Leishmania infantum / Q000201:enzymology* / Q000276:immunology; D007898:Leishmaniasis, Visceral / Q000517:prevention & control*; D051379:Mice; D008807:Mice, Inbred BALB C; D016052:Protozoan Vaccines / Q000008:administration & dosage / Q000276:immunology / Q000627:therapeutic use; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000276:immunology
D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D007074:Immunoglobulin G; D016052:Protozoan Vaccines; D019444:Vaccines, DNA; D003546:Cysteine Endopeptidases; C056657:cysteine proteinase I