title: C3d enhanced DNA vaccination induced humoral immune response to glycoprotein C of pseudorabies virus.
abstract: Murine C3d were utilized to enhance immunogenicity of pseudorabies virus (PrV) gC DNA vaccination. Three copies of C3d and four copies of CR2-binding domain M28(4) were fused, respectively, to truncated gC gene encoding soluble glycoprotein C (sgC) in pcDNA3.1. BALB/c mice were, respectively, immunized with recombinant plasmids, blank vector, and inactivated vaccine. The antibody ELISA titer for sgC-C3d3 DNA was 49-fold more than that for sgC DNA, and the neutralizing antibody obtained 8-fold rise. Protection of mice from death after lethal PrV (316 LD50) challenge was augmented from 25% to 100%. Furthermore, C3d fusion increased Th2-biased immune response by inducing IL-4 production. The IL-4 level for sgC-C3d3 DNA immunization approached that for the inactivated vaccine. Compared to C3d, M28 enhanced sgC DNA immunogenicity to a lesser extent. In conclusion, we demonstrated that murine C3d fusion significantly enhanced gC DNA immunity by directing Th1-biased to a balanced and more effective Th1/Th2 response.
authors.affiliation: National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Tiezhu
authors.initials: T
authors.lastname: Tong
authors.forename: Huiying
authors.initials: H
authors.lastname: Fan
authors.forename: Yadi
authors.initials: Y
authors.lastname: Tan
authors.forename: Shaobo
authors.initials: S
authors.lastname: Xiao
authors.forename: Jieyu
authors.initials: J
authors.lastname: Ling
authors.forename: Huanchun
authors.initials: H
authors.lastname: Chen
authors.forename: Aizhen
authors.initials: A
authors.lastname: Guo
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage; D000818:Animals; D000917:Antibody Formation / Q000276:immunology*; D015933:Complement C3d / Q000235:genetics / Q000276:immunology*; D011558:Herpesvirus 1, Suid / Q000276:immunology*; D007114:Immunization / Q000379:methods*; D051379:Mice; D008807:Mice, Inbred BALB C; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology; D019444:Vaccines, DNA / Q000276:immunology*; D014760:Viral Fusion Proteins / Q000276:immunology*
chemical_list: D000276:Adjuvants, Immunologic; D011993:Recombinant Fusion Proteins; D019444:Vaccines, DNA; D014760:Viral Fusion Proteins; D015933:Complement C3d