Vaccine potential of antigen cocktails composed of recombinant Toxoplasma gondii TgPI-1, ROP2 and GRA4 proteins against chronic toxoplasmosis in C3H mice

Experimental Parasitology
Mariano S PicchioValentina Martin

Abstract

The development of an effective and safe vaccine to prevent Toxoplasma gondii infection is an important aim due to the great clinical and economic impact of this parasitosis. We have previously demonstrated that immunization with the serine protease inhibitor-1 (TgPI-1) confers partial protection to C3H/HeN and C57BL/6 mice. In order to improve the level of protection, in this work, we combined this novel antigen with ROP2 and/or GRA4 recombinant proteins (rTgPI-1+rROP2, rTgPI-1+rGRA4, rTgPI-1+rROP2+rGRA4) to explore the best combination against chronic toxoplasmosis in C3H/HeN mice. All tested vaccine formulations, administered following a homologous prime-boost protocol that combines intradermal and intranasal routes, conferred partial protection as measured by the reduction of brain cyst burden following oral challenge with tissue cysts of Me49 T. gondii strain. The highest level of protection was achieved by the mixture of rTgPI-1 and rROP2 proteins with an average parasite burden reduction of 50% compared to the unvaccinated control group. The vaccine-induced protective effect was related to the elicitation of systemic cellular and humoral immune responses that included antigen-specific spleen cell proliferation, the relea...Continue Reading

Citations

Aug 24, 2019·Journal of Microbiological Methods·Fatemeh RezaeiAhmad Daryani
Nov 19, 2019·Journal of Dermatological Science·Matías Damián Perrone SibiliaAlejandra Goldman
Dec 22, 2020·International Journal for Parasitology·Nicholas C SmithGiel G van Dooren

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