title: Evaluation of Brucella abortus DNA and RNA vaccines expressing Cu-Zn superoxide dismutase (SOD) gene in cattle.
abstract: This study was conducted to evaluate the immunogenicity of a DNA or RNA vaccines encoding Brucella abortus Cu-Zn superoxide dismutase (SOD) in cattle. Intramuscular injection of plasmid DNA carrying Brucella SOD gene (pcDNA-SOD) into animals elicited both humoral and cellular immune responses. Animals injected with pcDNA-SOD developed SOD IgG antibody with predominance of immunoglobulin G1 (IgG1) isotype over IgG2. In addition, the DNA vaccine elicited a specific T-cell-proliferative response. Furthermore, intraperitoneal injection of cattle with recombinant Semliki Forest virus particles carrying recombinant RNA encoding SOD (SFV-SOD) did not lead to the induction of SOD IgG 1 or 2 antibody, but induced specific T-cell activation. Both vaccines were able to induce a non-significant secretion of gamma interferon and did not induce the secretion of IL-4 or tumor necrosis factor (TNF)-alpha. These results suggest that SOD gene in a genetic vaccine formulation (DNA or RNA) might be of potential us as a vaccine to induce cell-mediated immunity in cattle. To our knowledge, this is the first study to evaluate a genetic vaccine against Brucella in cattle.
authors.affiliation: Molecular Immunology Laboratory, Department of Microbiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción, Chile.
authors.forename: Darwin
authors.initials: D
authors.lastname: Sáez
authors.forename: Ingrid
authors.initials: I
authors.lastname: Guzmán
authors.forename: Edilia
authors.initials: E
authors.lastname: Andrews
authors.forename: Alex
authors.initials: A
authors.lastname: Cabrera
authors.forename: Angel
authors.initials: A
authors.lastname: Oñate
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000917:Antibody Formation; D002004:Brucella Vaccine / Q000008:administration & dosage / Q000276:immunology*; D002003:Brucella abortus / Q000201:enzymology / Q000235:genetics / Q000276:immunology*; D002007:Brucellosis, Bovine / Q000517:prevention & control*; D002417:Cattle; D005260:Female; D007111:Immunity, Cellular; D012313:RNA / Q000276:immunology*; D011897:Random Allocation; D013482:Superoxide Dismutase / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D002004:Brucella Vaccine; C039919:RNA, recombinant; D019444:Vaccines, DNA; D012313:RNA; D013482:Superoxide Dismutase