1. Low doses of killed parasite in CpG elicit vigorous CD4+ T cell responses against blood-stage malaria in mice
- Author
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Vivian Kienzle, Chakrit Hirunpetcharat, James S. McCarthy, Michael F. Good, Christian R. Engwerda, Virginia McPhun, and Alberto Pinzon-Charry
- Subjects
CD4-Positive T-Lymphocytes ,medicine.medical_treatment ,T cell ,Population ,Cross Reactions ,Biology ,Interferon-gamma ,Mice ,Immune system ,Adjuvants, Immunologic ,Antigen ,Malaria Vaccines ,medicine ,Animals ,education ,Mice, Inbred BALB C ,education.field_of_study ,General Medicine ,Acquired immune system ,medicine.disease ,Virology ,Malaria ,medicine.anatomical_structure ,Oligodeoxyribonucleotides ,Vaccines, Inactivated ,Immunization ,Immunology ,Interleukin-2 ,Female ,Immunologic Memory ,Adjuvant ,Research Article - Abstract
Development of a vaccine that targets blood-stage malaria parasites is imperative if we are to sustainably reduce the morbidity and mortality caused by this infection. Such a vaccine should elicit long-lasting immune responses against conserved determinants in the parasite population. Most blood-stage vaccines, however, induce protective antibodies against surface antigens, which tend to be polymorphic. Cell-mediated responses, on the other hand, offer the theoretical advantage of targeting internal antigens that are more likely to be conserved. Nonetheless, few of the current blood-stage vaccine candidates are able to harness vigorous T cell immunity. Here, we present what we believe to be a novel blood-stage whole-organism vaccine that, by combining low doses of killed parasite with CpG-oligodeoxynucleotide (CpG-ODN) adjuvant, was able to elicit strong and cross-reactive T cell responses in mice. Our data demonstrate that immunization of mice with 1,000 killed parasites in CpG-ODN engendered durable and cross-strain protection by inducing a vigorous response that was dependent on CD4+ T cells, IFN-gamma, and nitric oxide. If applicable to humans, this approach should facilitate the generation of robust, cross-reactive T cell responses against malaria as well as antigen availability for vaccine manufacture.
- Published
- 2010
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