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Journal Article | Research Support, Non-U.S. Gov't

Acquired immune responses to the N- and C-terminal regions of Plasmodium vivax merozoite surface protein 1 in individuals exposed to malaria.

I S Soares, G Levitus, J M Souza, H A Del Portillo, M M Rodrigues
I S Soares
Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Brazil.
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G Levitus
Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Brazil.
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J M Souza
Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Brazil.
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H A Del Portillo
Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Brazil.
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M M Rodrigues
Departamento de Patologia, Centro de Ciências Biológicas, Universidade Federal do Pará, Brazil.
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ABSTRACT

In this study, we evaluated the naturally acquired immune response to Plasmodium vivax merozoite surface protein 1 (PvMSP1) in individuals with recent clinical episodes of malaria from the state of Para, Brazil. Ten recombinant proteins representing the first 682 amino acids (aa) of the N-terminal region and one representing the final 111 aa of the C-terminal region were expressed in Escherichia coli as glutathione S-transferase fusion proteins. Both of these regions have been suggested as candidates for development of a vaccine against Plasmodium sp. The total frequencies of individuals with antibodies and cellular immune responses to PvMSP1 were high (83.8 and 75%, respectively). The recombinant proteins representing the N- and C-terminal regions were recognized by 51.4 and 64.1% of sera, respectively. The frequency of responders to the C-terminal region increased according to the number of previous malaria episodes, reaching 83.3% after four episodes. Cellular immune response was measured by in vitro proliferation and gamma interferon production. Peripheral blood mononuclear cells of 75 and 47.2% of individuals proliferated in response to stimulation by the N- and C-terminal regions, respectively. Also, we found that one protein representing the N terminus and a second representing the C terminus of PvMSP1 stimulated 54.5% of individuals to secrete gamma interferon. We concluded that PvMSP1 is immunogenic to a large proportion of individuals exposed to malaria. Our results also suggested that the C-terminal region of PvMSP1 containing the two epidermal growth factor-like domains is particularly immunogenic to antibodies and T cells during natural infection in humans.

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Acquired immune responses to the N- and C-terminal regions of Plasmodium vivax merozoite surface protein 1 in individuals exposed to malaria.
I S Soares, G Levitus, J M Souza, H A Del Portillo, M M Rodrigues
Infection and Immunity May 1997, 65 (5) 1606-1614; DOI:

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Acquired immune responses to the N- and C-terminal regions of Plasmodium vivax merozoite surface protein 1 in individuals exposed to malaria.
I S Soares, G Levitus, J M Souza, H A Del Portillo, M M Rodrigues
Infection and Immunity May 1997, 65 (5) 1606-1614; DOI:
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