Toxoplasma gondii: The immunogenic and protective efficacy of recombinant ROP2 and ROP4 rhoptry proteins in murine experimental toxoplasmosis |
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Authors: | Bozena Dziadek Justyna Gatkowska Jaroslaw Dziadek Henryka Dlugonska |
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Affiliation: | a Department of Immunoparasitology, University of Lodz, Lodz, Poland b Institute for Medical Biology, Polish Academy of Sciences, Lodz, Poland |
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Abstract: | Toxoplasmosis is a one of the most world-wide spread zoonosis representing a very serious clinical and veterinary problem. In the presented study, we evaluated the protective efficacy of a combined recombinant ROP2 and ROP4 subunit vaccine in a chronic Toxoplasma gondii infection in mice. The recombinant ROP2 (rROP2) and ROP4 (rROP4) proteins were cloned and expressed in Escherichia coli and then used for the immunization of C3H/HeJ mice. Both antigens generated a strong systemic mixed Th1/Th2 response polarized towards IgG1 antibody isotype. In contrast to rROP2 stimulating only the specific IL-2 release, rROP4 and crude toxoplasma lysate antigen (TLA) used as a source of native forms of the parasite proteins induced significant proliferation of splenocytes and specific production of IFN-γ as well as IL-2, the Th1-type cytokines. Challenge of rROP2 and rROP4-vaccinated mice with cysts of low virulent T. gondii DX strain resulted in a partial protection effect with a significantly lower brain parasites load when compared with control animals. In the immunized group of mice the brain cysts number was reduced by nearly 46% as was determined in two independent experiments. These results suggest that, similar to ROP2, rhoptry protein ROP4 could be a very good candidate for future anti-T. gondii multicomponent vaccine based on the recombinant forms of different parasite proteins. |
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Keywords: | Toxoplasma gondii Immunoprotection Subunit vaccines Recombinant ROP2 Recombinant ROP4 |
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