Oral immunization with recombinant Lactococcus lactis delivering a multi-epitope antigen CTB-UE attenuates Helicobacter pylori infection in mice.

Abstract

Urease is an essential virulence factor and colonization factor for Helicobacter pylori (H. pylori) and is considered as an excellent vaccine candidate antigen. However, conventional technologies for preparing an injectable vaccine require purification of the antigenic protein and preparation of an adjuvant. Lactococcus lactis NZ9000 (L. lactis) could serve as an antigen-delivering vehicle for the development of edible vaccine. In previous study, we constructed a multi-epitope vaccine, designated CTB-UE, which is composed of the mucosal adjuvant cholera toxin B subunit (CTB), three Th cell epitopes and two B-cell epitopes from urease subunits. To develop a novel type of oral vaccine against H. pylori, genetically modified L. lactis strains were established to secrete this epitope vaccine extracellularly in this study. Oral prophylactic immunization with recombinant L. lactis significantly elicited humoral anti-urease antibody responses (P < 0.001) and reduced the gastric colonization of H. pylori from 7.14 ± 0.95 to 4.68 ± 0.98 log10 CFU g(-1) stomach. This L. lactis oral vaccine offers a promising vaccine candidate for the control of H. pylori infection.

• Authors: Xinyang Li, Yingying Xing, Le Guo, Xiaobo Lv, Hui Song, Tao Xi
• Journal: Pathogens and disease (Pathog Dis) Vol. 72 Issue 1 Pg. 78-86 (Oct 2014) ISSN: 2049-632X [Electronic] United States
• PMID: 24687988 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2014 Federation of European Microbiological Societies. Published by John Wiley & Sons Ltd. All rights reserved.

Chemical References

• Adjuvants, Immunologic
• Antibodies, Bacterial
• Antigens, Bacterial
• Bacterial Vaccines
• Drug Carriers
• Epitopes
• Recombinant Fusion Proteins
• Vaccines, Edible
• Vaccines, Synthetic
• Cholera Toxin
• Urease

Topics

• Adjuvants, Immunologic (administration & dosage, genetics)
• Administration, Oral
• Animals
• Antibodies, Bacterial (blood)
• Antigens, Bacterial (genetics, immunology)
• Bacterial Load
• Bacterial Vaccines (administration & dosage, genetics, immunology)
• Cholera Toxin (administration & dosage, genetics)
• Disease Models, Animal
• Drug Carriers (administration & dosage)
• Epitopes (genetics, immunology)
• Helicobacter Infections (immunology, prevention & control)
• Helicobacter pylori (genetics, immunology)
• Immunization (methods)
• Lactococcus lactis (genetics)
• Male
• Mice, Inbred BALB C
• Recombinant Fusion Proteins (genetics, immunology)
• Stomach (microbiology)
• Urease (genetics, immunology)
• Vaccines, Edible (administration & dosage, genetics, immunology)
• Vaccines, Synthetic (administration & dosage, genetics, immunology)