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Rodent malaria in the natural host--irradiated sporozoites of Plasmodium berghei induce liver-stage specific immune responses in the natural host Grammomys surdaster and protect immunized Grammomys against P. berghei sporozoite challenge



Rodent malaria in the natural host--irradiated sporozoites of Plasmodium berghei induce liver-stage specific immune responses in the natural host Grammomys surdaster and protect immunized Grammomys against P. berghei sporozoite challenge



African Journal of Medicine and Medical Sciences 30(Suppl.): 25-33



The choice of the host in studying host-parasite interactions is of crucial importance, and the use of a natural host is most appropriate in answering pertinent questions related to human malaria. The Grammomys surdaster is the natural host and reservoir of the rodent malaria parasite Plasmodium berghei. This natural host is difficult to protect by irradiated sporozoite immunization, a situation comparable to what has been observed in humans with P. falciparum. This is in contrast to the complete protection that can be induced in artificial hosts like inbred mice strains. The natural host is highly susceptible to P. berghei hepatic stage infections. Immunization with irradiated sporozoites in Grammomys generates blocked hepatic stage parasites and immunized Grammomys protected upon live sporozoite challenge generate antibody and T cell proliferative responses to these hepatic stages. Associated with proliferation, cytokines are secreted into culture supernatants constituted mainly of Interferon gamma, negligible amounts of TNF-alpha, and no IL-4. Natural host-parasite interactions of Grammomys surdaster-P. berghei can help define the effector mechanism(s) in the Plasmodium falciparum-human interaction.

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Accession: 050226926

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PMID: 14513935


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