Volume 81, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Human African trypanosomiasis is a neglected disease caused by spp. A parasite cation pump (Ca ATPase; TBCA2) essential for survival and cation homeostasis was identified and characterized. It was hypothesized that targeting this pump using a ghost (VCG)-based vaccine could protect against murine infection. mRNA and protein expression of TBCA2 was differentially expressed in blood and insect stages of parasites and immunolocalized in the pericellular membrane and the flagellar pocket of bloodstream forms. Antigen-specific antibodies and Th1 cytokines, interleukin-2, interferon-gamma, and tumor necrosis factor-alpha were induced in rVCG-TBCA2-immunized mice and on antigen stimulation of splenic immune T cells, but the corresponding Th2-type response was unremarkable. Despite an increased median survival of 6 days in vaccinated mice, the mice were not protected against infection. Thus, immunization of mice produced robust parasite-specific antibodies but failed to protect mice against parasite challenge.


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  • Received : 25 Jan 2008
  • Accepted : 23 May 2009

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