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. 1996 Jun;64(6):2158–2166. doi: 10.1128/iai.64.6.2158-2166.1996

Intranasal immunization with SAG1 protein of Toxoplasma gondii in association with cholera toxin dramatically reduces development of cerebral cysts after oral infection.

N Debard 1, D Buzoni-Gatel 1, D Bout 1
PMCID: PMC174050  PMID: 8675321

Abstract

SAG1 protein of Toxoplasma gondii was evaluated as a protective antigen in mucosal immunization with cholera toxin as an adjuvant. CBA/J mice intranasally immunized with a combination of SAG1 and cholera toxin exhibited significantly fewer cysts in the brain after oral infection with the 76K strain of T. gondii than control mice. This acquired protection lasted at least 5 months. Protected mice developed high levels of serum anti-SAG1 immunoglobulin G antibodies as well as an enhanced systemic cellular response, as assessed by the proliferation of splenocytes in response to SAG1 restimulation in vitro. This cellular proliferation was associated with an increase of interleukin-2 and interleukin-5 synthesis and with barely detectable gamma interferon production. Splenic immune T cells were shown to convey modest protection to recipients against development of brain cysts following oral infection with T. gondii. Significant production of anti-SAG1 immunoglobulin A was induced in intestinal secretions of protected mice. These results indicate that intranasal immunization with SAG1 and cholera toxin can induce mucosal and systemic immune responses and affords partial and long-lasting resistance against the establishment of chronic toxoplasmosis.

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Selected References

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