title: Immune responses of mice to vaccinia virus recombinants expressing either Listeria monocytogenes partial listeriolysin or Brucella abortus ribosomal L7/L12 protein.
abstract: The Brucella abortus L7/L12 gene encoding ribosomal protein L7/L12 and the Listeria monocytogenes partial hly gene encoding the protective region of the hemolysin (partial listeriolysin, pLLO) were cloned into vaccinia virus by homologous recombination to produce recombinants WRL7/L12 and WRpLLO, respectively. The ability of these recombinants to induce humoral, cell mediated and protective immune response in mice was assessed. Although mice inoculated with WRL7/L12 recombinant produced antibodies specific to vaccinia virus and L7/L12 antigens, they were not protected against a virulent challenge with B. abortus 2308 strain. In contrast, mice inoculated with WRpLLO were protected against a challenge with virulent L. monocytogenes. Stimulation with purified fusion listeriolysin protein (MBP-LLO), but not with unrelated control protein (MBP), induced splenocytes from WRpLLO-inoculated mice to secrete significantly higher amounts of IFN-gamma than saline inoculated mice. Mice inoculated with either WRpLLO or WRL7/L12 recombinants produced predominantly IgG2a isotype antibody responses, indicative of a Th1 type of immune response. The protective potential of the WRpLLO recombinant correlated with the level of IFN-gamma produced in these mice.
authors.affiliation: Center for Molecular Medicine and Infectious Diseases, Department of Biomedical Sciences and Pathobiology, VA-MD Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, 1410 Prices Fork Road, Blacksburg, VA 24060, USA.
authors.forename: Simge
authors.initials: S
authors.lastname: Baloglu
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Boyle
authors.forename: Ramesh
authors.initials: R
authors.lastname: Vemulapalli
authors.forename: Nammalwar
authors.initials: N
authors.lastname: Sriranganathan
authors.forename: Gerhardt G
authors.initials: GG
authors.lastname: Schurig
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Toth
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001427:Bacterial Toxins / Q000235:genetics / Q000276:immunology*; D001428:Bacterial Vaccines / Q000235:genetics / Q000276:immunology* / Q000627:therapeutic use; D002003:Brucella abortus / Q000235:genetics / Q000276:immunology*; D002006:Brucellosis / Q000276:immunology* / Q000382:microbiology / Q000517:prevention & control; D006360:Heat-Shock Proteins / Q000235:genetics / Q000276:immunology*; D006460:Hemolysin Proteins; D007114:Immunization; D007371:Interferon-gamma / Q000032:analysis; D008089:Listeria monocytogenes / Q000235:genetics / Q000276:immunology*; D008088:Listeriosis / Q000276:immunology* / Q000382:microbiology / Q000517:prevention & control; D051379:Mice; D008807:Mice, Inbred BALB C; D011994:Recombinant Proteins / Q000235:genetics / Q000276:immunology; D012269:Ribosomal Proteins / Q000235:genetics / Q000276:immunology*; D014614:Vaccines, Synthetic / Q000235:genetics / Q000276:immunology / Q000627:therapeutic use; D014616:Vaccinia virus / Q000235:genetics / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D001427:Bacterial Toxins; D001428:Bacterial Vaccines; D006360:Heat-Shock Proteins; D006460:Hemolysin Proteins; D011994:Recombinant Proteins; D012269:Ribosomal Proteins; D014614:Vaccines, Synthetic; C016700:ribosomal protein L7-L12; D007371:Interferon-gamma; C038705:hlyA protein, Listeria monocytogenes