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. 1995 Apr;63(4):1349–1355. doi: 10.1128/iai.63.4.1349-1355.1995

Oral immunization with the dodecapeptide repeat of the serine-rich Entamoeba histolytica protein (SREHP) fused to the cholera toxin B subunit induces a mucosal and systemic anti-SREHP antibody response.

T Zhang 1, E Li 1, S L Stanley Jr 1
PMCID: PMC173157  PMID: 7890393

Abstract

The intestinal protozoan parasite Entamoeba histolytica causes amebic dysentery, a major cause of morbidity worldwide. The induction of a mucosal antibody response capable of blocking amebic adhesion to intestinal cells could represent an approach to preventing E. histolytica infection and disease. Here we describe the expression of a chimeric protein containing an immunogenic dodecapeptide derived from the serine-rich E. histolytica protein (SREHP), fused to the cholera toxin B subunit (CtxB). The CtxB-SREHP-12 chimeric protein was purified from Escherichia coli lysates and retained the critical GM1 ganglioside-binding activity of the CtxB moiety. Mice fed the CtxB-SREHP-12 fusion protein along with a subclinical dose of cholera toxin developed mucosal immunoglobulin A and immunoglobulin G and systemic antibody responses that recognized recombinant and native SREHP. Our study confirms the feasibility of inducing mucosal immune responses to immunogenic peptides by their genetic fusion to the CtxB subunit and identifies the CtxB-SREHP-12 chimeric protein as a candidate oral vaccine to prevent E. histolytica infection.

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Selected References

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