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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 104, No. 2, 2009, pp. 241-245
Bioline Code: oc09040
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 104, No. 2, 2009, pp. 241-245

 en Experimental reinfection of BALB/c mice with different recombinant type I/III strains of Toxoplasma gondii check for this species in other resources : involvement of IFN-γ and IL-10
Brandão, Geane Peroni; Melo, Maria Norma; Gazzinelli, Ricardo Tostes; Caetano, Braulia Costa; Ferreira, Adriana Melo; Silva, Letícia Azevedo & Vitor, Ricardo Wagner Almeida


To assess reinfection of BALB/c mice with different Toxoplasma gondii check for this species in other resources strains, the animals were prime infected with the non-virulent D8 strain and challenged with virulent recombinant strains. Thirty days after challenge, brain cysts were obtained from surviving BALB/c mice and inoculated in Swiss mice to obtain tachyzoites for DNA extraction and PCR-RFLP analysis to distinguish the different T. gondii strains present in possible co-infections. Anti- Toxoplasma immune responses were evaluated in D8-primed BALB/c mice by detecting IFN-γ and IL-10 produced by T cells and measuring immunoglobulin levels in serum samples. PCR-RFLP demonstrated that BALB/c mice were reinfected with the EGS strain at 45 days post prime infection (dpi) and with the EGS and CH3 strains at 180 dpi. High levels of IFN-γ were detected after D8 infection, with no significant difference between 45 and 180-day intervals. However, higher IL-10 levels and higher plasmatic IgG1 and IgA were detected from samples obtained 180 days after infection. BALB/c mice were susceptible to reinfection with different recombinant T. gondii strains and this susceptibility correlated with enhancement of IL-10 production.

experimental toxoplasmosis - reinfection - recombinant strains - cytokine

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