In this report, we investigated the effect of ODN containing immunostimulatory CG motifs as adjuvant with soluble antigen (SA) from Leishmania donovani. BALB/c mice were vaccinated with the soluble antigen with or without CpG-ODN as adjuvant and then challenged with L. donovani metacyclic promastigotes. CpG-ODN alone resulted in partial protection against challenge with L. donovani. Immunization of mice with SA and CpG-ODN showed enhanced reduction in parasite load (∼60%) when compared to SA (∼40%) immunized mice. Immunization with SA by itself resulted in a mixed Th1/Th2 response whereas co-administration of SA with CpG-ODN resulted in a strong Th1 promoting isotype as they together promoted production of immunoglobulin G2a. Leishmania-specific Th1 cytokine response was induced by co-administering CpG-ODN and SA as they together promoted production of IFN-γ and IL-12. In the present study, we demonstrate that immunostimulatory phosphorothioate- modified ODN are promising immune enhancers for vaccination against visceral leishmaniaisis. © 2004 Published by Elsevier B.V. on behalf of the Federation of European Microbiological Societies.
Tewary, P., Mehta, J., Sukumaran, B., & Madhubala, R. (2004). Vaccination with Leishmania soluble antigen and immunostimulatory oligodeoxynucleotides induces specific immunity and protection against Leishmania donovani infection. FEMS Immunology and Medical Microbiology, 42(2), 241–248. https://doi.org/10.1016/j.femsim.2004.05.008