Attenuated recombinant Yersinia as live oral vaccine carrier to protect against amoebiasis.

Abstract

Various attenuated Yersinia enterocolitica strains expressing different sections of the Entamoeba histolytica surface lectin via the type III protein secretion system (T3SS) were assessed for their use to orally vaccinate rodents against invasive amoebiasis. The T3SS was found to efficiently express and secrete or translocate subfragments as well as the entire heavy subunit of the lectin. Oral vaccination with recombinant Yersinia conferred significant protection against amoebic liver abscess formation when the antigen was expressed as a fusion molecule with the translocation domain of Yersinia outer protein E. However, effectiveness of vaccination was dependent on gender and the rodent species used. Protection was mediated primarily by cellular immune mechanisms as it was independent from the antibody titre against the amoeba lectin but correlated with an antigen-specific Th1-cytokine response. The results suggest that gram-negative bacteria expressing E. histolytica antigens via T3SS may constitute a suitable oral vaccine carrier against amoebiasis and that an effective IFN-gamma response is required for protection against invasive amoebiasis.

• Authors: Hannelore Lotter, Holger Rüssmann, Jürgen Heesemann, Egbert Tannich
• Journal: International journal of medical microbiology : IJMM (Int J Med Microbiol) Vol. 298 Issue 1-2 Pg. 79-86 (Jan 2008) ISSN: 1618-0607 [Electronic] Germany
• PMID: 17900982 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Review)

Chemical References

• Bacterial Outer Membrane Proteins
• Protozoan Vaccines
• Recombinant Proteins
• Vaccines, Attenuated
• yopE protein, Yersinia

Topics

• Administration, Oral
• Animals
• Bacterial Outer Membrane Proteins (immunology)
• Entamoeba histolytica (immunology)
• Entamoebiasis (immunology, parasitology, prevention & control)
• Humans
• Protozoan Vaccines (administration & dosage, immunology)
• Recombinant Proteins (immunology)
• Vaccines, Attenuated (administration & dosage, immunology)
• Yersinia enterocolitica (immunology)