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. 1994 Oct 11;91(21):9866–9870. doi: 10.1073/pnas.91.21.9866

Protection against malaria by immunization with plasmid DNA encoding circumsporozoite protein.

M Sedegah 1, R Hedstrom 1, P Hobart 1, S L Hoffman 1
PMCID: PMC44918  PMID: 7937907

Abstract

Immunization with irradiated sporozoites protects animals and humans against malaria, and the circumsporozoite protein is a target of this protective immunity. We now report that adjuvant-free intramuscular injection of mice with plasmid DNA encoding the Plasmodium yoelii circumsporozoite protein induced higher levels of antibodies and cytotoxic T lymphocytes against the P. yoelii circumsporozoite protein than did immunization with irradiated sporozoites. Mice immunized with this vaccine had an 86% reduction in liver-stage parasite burden after challenge with 5 x 10(5) sporozoites (> 10(5) median infectious doses). Eighteen (68%) of 28 mice that received two or three doses of vaccine were protected against challenge with 10(2) sporozoites, and the protection was dependent on CD8+ T cells. These studies demonstrate the utility of plasmid DNA immunization against a nonviral infection. By obviating the requirement for peptide synthesis, expression and purification of recombinant proteins, and adjuvants, this method of immunization provides an important alternative for rapid identification of protective B- and T-cell epitopes and for construction of vaccines to prevent malaria and other infectious diseases.

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Selected References

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