Influenza and vaccinia viruses expressing malaria CD8+ T and B cell epitopes. Comparison of their immunogenicity and capacity to induce protective immunity

Autor: M Rodrigues, S Li, K Murata, D Rodriguez, J R Rodriguez, I Bacik, J R Bennink, J W Yewdell, A Garcia-Sastre, R S Nussenzweig
Rok vydání: 1994
Předmět:
Zdroj: The Journal of Immunology. 153:4636-4648
ISSN: 1550-6606
0022-1767
Popis: We compared the effectiveness of several recombinant influenza and vaccinia viruses to induce a malaria-specific immune response. The CD8+ T cell epitope of the circumsporozoite (CS) protein of Plasmodium yoelii, a rodent malaria parasite, was expressed in two distinct influenza virus proteins, the hemagglutinin and the neuraminidase. These recombinant viruses were found to be equally efficient at inducing CS-specific CD8+ T cells in mice. A third recombinant virus, which expresses a B cell epitope of the CS protein, induced neutralizing anti-sporozoite Abs. Expression in the same recombinant virus of the CD8+ T cell epitope and of the B cell epitope did not impair the capacity of this recombinant virus to induce malaria-specific CD8+ T cells and neutralizing Abs. The immunogenicity of a vaccinia virus, expressing the entire CS protein, was compared with that of a highly attenuated vaccinia strain expressing the same protein and with that of another vaccinia virus expressing only the CD8+ T cell epitope. All three vaccinia virus recombinants elicited CS-specific CD8+ cells and a potent inhibitory response against pre-erythrocytic stages of malaria parasites. Optimal levels of anti-sporozoite Abs, inhibition of liver stage development, and protection against malaria infection resulted from repeatedly immunizing the animals with recombinant influenza viruses followed by boosters with a recombinant vaccinia virus. These findings support the concept that live viral vectors expressing the appropriate proteins and/or epitopes can be used as promising vaccine candidates.
Databáze: OpenAIRE
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