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. 1993 May;61(5):2082–2088. doi: 10.1128/iai.61.5.2082-2088.1993

Oral immunization with Toxoplasma gondii antigens in association with cholera toxin induces enhanced protective and cell-mediated immunity in C57BL/6 mice.

I Bourguin 1, T Chardès 1, D Bout 1
PMCID: PMC280806  PMID: 8478097

Abstract

Following oral immunization of C57BL/6 mice with a Toxoplasma gondii sonicate (TSo) in association with either cholera toxin (CT) or CT B subunit, the T. gondii-specific in vitro proliferation of splenic T lymphocytes was determined. Cytokines produced by these T cells were then characterized. After oral challenge with T. gondii 76K cysts, the percentage of cumulative survival was assessed, as was the number of brain cysts in the mice which survived. The TSo-specific proliferation of splenic T lymphocytes was greatly enhanced by the use of CT, whereas CT B subunit alone did not lead to amplification of splenic T-cell proliferation. The use of CT was associated with an increase of interleukin-2 (IL-2) and gamma interferon synthesis by TSo-stimulated splenic T cells, whereas no enhancement of IL-5 and IL-6 production was observed. IL-4 was not detected. A significant protection of mice immunized orally with TSo plus CT was observed in comparison with those immunized with TSo alone. This protection was associated with a large decrease in the number of brain cysts compared with the number found in naive mice infected orally with a sublethal dose of T. gondii 76K cysts. Further studies, using well-defined T. gondii proteins which are known to induce both mucosal and systemic immune responses, are needed to confirm the value of CT in the enhancement of protection against oral toxoplasmosis.

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Selected References

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