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Immunological Comparison of Dna Vaccination Using Two Delivery Systems Against Canine Leishmaniasis Publisher Pubmed



Shahbazi M1, 2 ; Zahedifard F2 ; Saljoughian N2 ; Doroud D2 ; Jamshidi S3 ; Mahdavi N3 ; Shirian S4 ; Daneshbod Y4 ; Hamid Zarkeshesfahani S1 ; Papadopoulou B5 ; Rafati S2
Authors
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Authors Affiliations
  1. 1. Department of Immunology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2. Department of Immunotherapy and Leishmania Vaccine Research, Pasteur Institute of Iran, 69, Pasteur Ave., Tehran, 13164, Iran
  3. 3. Department of Internal Medicine, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
  4. 4. Department of Molecular and Cytopathology, Daneshbod Pathology Laboratory, Shiraz, Iran
  5. 5. Research Centre in Infectious Disease, CHU de Quebec Research Centre and Department of Microbiology, Infectious Disease and Immunology, Laval University, QC, Canada

Source: Veterinary Parasitology Published:2015


Abstract

Visceral leishmaniasis (VL) is a fatal disease caused by the intracellular protozoan parasite Leishmania infantum. Dogs are the primary reservoirs of this parasite, and vaccination of dogs could be an effective method to reduce its transfer to humans. In order to develop a vaccine against VL (apart from the choice of immunogenic candidate antigens), it is necessary to use an appropriate delivery system to promote a proper antigen-specific immune response. In this study, we compared two vaccine delivery systems, namely electroporation and cationic solid-lipid nanoparticle (cSLN) formulation, to administer a DNA vaccine containing the Leishmania donovani A2 antigen, and L. infantum cysteine proteinases of type I (CPA) and II (CPB) without its unusual C-terminal extension. The protective potencies of these two vaccine delivery systems were evaluated against L. infantum challenge in outbred dogs. Our results show that the administration of pcDNA-A2-CPA-CPB-CTE GFP vaccine as a prime-boost by either electroporation or cSLN formulation protects the dogs against L. infantum infection. Partial protection in vaccinated dogs is associated with significantly (p<0.05) higher levels of IgG2, IFN-γ, and TNF-α and with low levels of IgG1 and IL-10 as compared to the control group. Protection was also correlated with a low parasite burden and a strong delayed-type hypersensitivity (DTH) response. This study demonstrates that both electroporation and cSLN formulation can be used as efficient vaccine delivery systems against visceral leishmaniasis. © 2015 Elsevier B.V.
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