• English
    • français
  • English 
    • English
    • français
  • Login
View Item 
  •   Repository Home
  • Research Papers (RP)
  • RP-School of Pure and Applied Sciences
  • RP-Department of Zoological Sciences
  • View Item
  •   Repository Home
  • Research Papers (RP)
  • RP-School of Pure and Applied Sciences
  • RP-Department of Zoological Sciences
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Vervet Monkeys Vaccinated with Killed Leishmania major Parasites and Interleukin-12 Develop a Type 1 Immune Response but Are Not Protected against Challenge Infection

Thumbnail
View/Open
Abstract (68.85Kb)
Date
2001-01
Author
Gicheru, M. M.
Olobo, Joseph O.
Anjili, Christopher O.
Orago, A. S.
Farrokh, Modabber
Phillip, Scott
Metadata
Show full item record
Abstract
Leishmania major is a protozoan parasite that causes chronic cutaneous lesions that often leave disfiguring scars. Infections in mice have demonstrated that leishmanial vaccines that include interleukin-12 (IL-12) as an adjuvant are able to induce protective immunity. In this study, we assessed the safety, immunopotency, and adjuvant potential of two doses of IL-12 when used with a killed L. major vaccine in vervet monkeys. The induction of cell-mediated immunity following vaccination was determined by measuring delayed-type hypersensitivity, in vitro lymphocyte proliferation, and gamma interferon (IFN-γ) production. Protection was assessed by challenging the animals with L. major parasites and monitoring the course of infection. At low doses of IL-12 (10 μg), a small increase in the parameters of cell-mediated immunity was observed, relative to those in animals that received antigen without IL-12. However, none of these animals were protected against a challenge infection. At higher doses of IL-12 (30 μg), a substantial increase in Leishmania-specific immune responses was observed, and monkeys immunized with antigen and IL-12 exhibited an IFN-γ response that was as great as that in animals that had resolved a primary infection and were immune. Nevertheless, despite the presence of correlates of protection, the disease course was only slightly altered, and protection was low compared to that in self-cured monkeys. These data suggest that protection against leishmaniasis may require more than the activation of Leishmania-specific IFN-γ-producing T cells, which has important implications for designing a vaccine against leishmaniasis
URI
http://ir-library.ku.ac.ke/handle/123456789/11244
Collections
  • RP-Department of Zoological Sciences [233]

Designed by Library ICT Team copyright © 2017 
Contact Us | Send Feedback

 

 

Browse

All of RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

LoginRegister

Designed by Library ICT Team copyright © 2017 
Contact Us | Send Feedback