A combination of antigenic regions of Toxoplasma gondii microneme proteins induces protective immunity against oral infection with parasite cysts

Elisa Beghetto, Henrik V. Nielsen, Paola Del Porto, Wilma Buffolano, Silvia Guglietta, Franco Felici, Eskild Petersen, Nicola Gargano

Research output: Contribution to journalArticle

Abstract

Infection with Toxoplasma gondii causes morbidity and mortality in congenitally infected and immunocompromised individuals. Both humoral and cell-mediated immunity are involved in host resistance to invasion of the parasite. Among putative vaccine candidates, the T. gondii microneme proteins appear to be promising, because they are responsible for the invasion process. The present work focused on studying the immunogenicity of microneme proteins in infected individuals and in a mouse model of chronic toxoplasmosis. We identified 5 distinct antigenic regions within MIC2, MIC4, MIC2-associated protein, and apical membrane antigen 1 gene products, which were recognized by (1) T cells from both adults with acquired infection and children with congenital infection and (2) antibodies from all patients. Finally, we demonstrated that DNA immunization with microneme fragments elicited effective protection in mice (84% reduction in brain-cyst burden), suggesting that a combination of these antigenic regions should be considered in the design of potential vaccines against toxoplasmosis.

Original languageEnglish
Pages (from-to)637-645
Number of pages9
JournalJournal of Infectious Diseases
Volume191
Issue number4
DOIs
Publication statusPublished - Feb 15 2005

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Immunology

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    Beghetto, E., Nielsen, H. V., Del Porto, P., Buffolano, W., Guglietta, S., Felici, F., Petersen, E., & Gargano, N. (2005). A combination of antigenic regions of Toxoplasma gondii microneme proteins induces protective immunity against oral infection with parasite cysts. Journal of Infectious Diseases, 191(4), 637-645. https://doi.org/10.1086/427660