title: 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.affiliation: Biotechnology Center, School of Life Science and Technology, China Pharmaceutical University, Nanjing, China.
authors.forename: Xinyang
authors.initials: X
authors.lastname: Li
authors.forename: Yingying
authors.initials: Y
authors.lastname: Xing
authors.forename: Le
authors.initials: L
authors.lastname: Guo
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Lv
authors.forename: Hui
authors.initials: H
authors.lastname: Song
authors.forename: Tao
authors.initials: T
authors.lastname: Xi
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage / Q000235:genetics; D000284:Administration, Oral; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000235:genetics / Q000276:immunology; D058491:Bacterial Load; D001428:Bacterial Vaccines / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D002772:Cholera Toxin / Q000008:administration & dosage / Q000235:genetics; D004195:Disease Models, Animal; D004337:Drug Carriers / Q000008:administration & dosage; D000939:Epitopes / Q000235:genetics / Q000276:immunology*; D016481:Helicobacter Infections / Q000276:immunology / Q000517:prevention & control*; D016480:Helicobacter pylori / Q000235:genetics / Q000276:immunology*; D007114:Immunization / Q000379:methods*; D013294:Lactococcus lactis / Q000235:genetics*; D008297:Male; D008807:Mice, Inbred BALB C; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000276:immunology; D013270:Stomach / Q000382:microbiology; D014510:Urease / Q000235:genetics / Q000276:immunology*; D022462:Vaccines, Edible / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology; D014614:Vaccines, Synthetic / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D004337:Drug Carriers; D000939:Epitopes; D011993:Recombinant Fusion Proteins; D022462:Vaccines, Edible; D014614:Vaccines, Synthetic; D002772:Cholera Toxin; D014510:Urease
keywords: Helicobacter pylori urease; Lactococcus lactis; cholera toxin B; multi-epitope vaccine; oral delivery