title: Immunization with the immunodominant Helicobacter suis urease subunit B induces partial protection against H. suis infection in a mouse model.
abstract: Helicobacter (H.) suis is a porcine and human gastric pathogen. Previous studies in mice showed that an H. suis infection does not result in protective immunity, whereas immunization with H. suis whole-cell lysate (lysate) protects against a subsequent experimental infection. Therefore, two-dimensional gel electrophoresis of H. suis proteins was performed followed by immunoblotting with pooled sera from H. suis- infected mice or mice immunized with lysate. Weak reactivity against H. suis proteins was observed in post-infection sera. Sera from lysate-immunized mice, however, showed immunoreactivity against a total of 19 protein spots which were identified using LC-MS/MS. The H. suis urease subunit B (UreB) showed most pronounced reactivity against sera from lysate-immunized mice and was not detected with sera from infected mice. None of the pooled sera detected H. suis neutrophil-activating protein A (NapA). The protective efficacy of intranasal vaccination of BALB/c mice with H. suis UreB and NapA, both recombinantly expressed in Escherichia coli (rUreB and rNapA, respectively), was compared with that of H. suis lysate. All vaccines contained choleratoxin as adjuvant. Immunization of mice with rUreB and lysate induced a significant reduction of H. suis colonization compared to non-vaccinated H. suis-infected controls, whereas rNapA had no significant protective effect. Probably, a combination of local Th1 and Th17 responses, complemented by antibody responses play a role in the protective immunity against H. suis infections.
authors.affiliation: Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium. miet.vermoote@ugent.be.
authors.forename: Miet
authors.initials: M
authors.lastname: Vermoote
authors.forename: Katleen
authors.initials: K
authors.lastname: Van Steendam
authors.forename: Bram
authors.initials: B
authors.lastname: Flahou
authors.forename: Annemieke
authors.initials: A
authors.lastname: Smet
authors.forename: Frank
authors.initials: F
authors.lastname: Pasmans
authors.forename: Pieter
authors.initials: P
authors.lastname: Glibert
authors.forename: Richard
authors.initials: R
authors.lastname: Ducatelle
authors.forename: Dieter
authors.initials: D
authors.lastname: Deforce
authors.forename: Freddy
authors.initials: F
authors.lastname: Haesebrouck
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage; D000281:Administration, Intranasal; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D000917:Antibody Formation; D000942:Antigens, Bacterial / Q000235:genetics / Q000276:immunology; D001426:Bacterial Proteins / Q000235:genetics / Q000276:immunology*; D001428:Bacterial Vaccines / Q000008:administration & dosage / Q000276:immunology*; D002772:Cholera Toxin / Q000008:administration & dosage / Q000276:immunology; D002853:Chromatography, Liquid / Q000662:veterinary; D016207:Cytokines / Q000276:immunology; D015180:Electrophoresis, Gel, Two-Dimensional / Q000662:veterinary; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005260:Female; D016481:Helicobacter Infections / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control*; D018247:Helicobacter heilmannii / Q000201:enzymology*; D015151:Immunoblotting / Q000662:veterinary; D051379:Mice; D008807:Mice, Inbred BALB C; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology; D013270:Stomach / Q000276:immunology / Q000382:microbiology / Q000473:pathology; D053719:Tandem Mass Spectrometry / Q000662:veterinary; D014510:Urease / Q000235:genetics / Q000276:immunology*
chemical_list: D000276:Adjuvants, Immunologic; D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D001428:Bacterial Vaccines; D016207:Cytokines; D011994:Recombinant Proteins; D002772:Cholera Toxin; D014510:Urease