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  • Title: Studies on the protective efficacy of second-generation vaccine along with standard antileishmanial drug in Leishmania donovani infected BALB/c mice.
    Author: Joshi J, Kaur S.
    Journal: Parasitology; 2014 Apr; 141(4):554-62. PubMed ID: 24618257.
    Abstract:
    It is well established that visceral leishmaniasis (VL; also known as Kala azar) causes immunosuppression, and a successful drug treatment is associated with the development of cell-mediated immunity. Therefore combining a drug with an immune enhancer can provide a better approach for the treatment of the disease. Keeping this in mind, the in vivo antileishmanial efficacy of immunochemotherapy was evaluated with the use of a 78 kDa antigen with or without monophosphoryl lipid A (MPL-A) along with a traditional drug sodium stibogluconate (SSG) in Leishmania donovani infected BALB/c mice. Mice were infected intracardially with promastigotes of L. donovani, and 30 days after infection, these animals were given specific immunotherapy (78 kDa/78 kDa+MPL-A) or chemotherapy (SSG) or immunochemotherapy (SSG+78 kDa/SSG+78 kDa+MPL-A). Animals were euthanased on 1, 15 and 30 post-treatment days. The antileishmanial potential of the immunochemotherapy was revealed by significant reduction in the parasite burden (P<0·001). These animals were also found to exhibit increased delayed type hypersensitivity (DTH) responses, higher IgG2a levels, lower IgG1 levels and greater cytokine (IFN-γ and IL-2) concentrations compared with chemotherapy or immunotherapy alone, pointing towards the generation of a strong protective (Th1) type of immune response. Immunochemotherapy with SSG+78 kDa+MPL-A was found to be most effective in protecting mice against VL and therefore can be an alternative option for treatment of VL.
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