Comparison of immune responses and protective efficacy of suicidal DNA vaccine and conventional DNA vaccine encoding glycoprotein C of pseudorabies virus in mice.
In the present study, the immunogenicity and protective efficacy of a suicidal DNA vaccine (pSFVC1.5) incorporating Semliki Forest virus (SFV) replicon and expressing glycoprotein C (gC) of pseudorabies virus (PrV) was investigated and compared with a conventional plasmid DNA vaccine (pcDC) encoding the same antigen. In vitro, pSFVC1.5 could express gC protein and induce apoptosis of the transfected cells. After immunization in BALB/c mice, the gC-specific ELISA antibodies and neutralizing antibodies induced by pSFVC1.5 were relatively lower than those obtained in mice immunized with pcDC. However, mice immunized with pSFVC1.5 could confer more efficient protection than pcDC (100 and 62.5%, respectively) when challenged with the field PrV at 4 weeks after secondary immunization. Further analyses of cell-mediated immune responses showed that pSFVC1.5 induced stronger lymphocyte proliferative responses and higher levels of IFN-gamma, suggesting pSFVC1.5 could induce an enhanced Th1-type immune response. Collectively these results indicated that suicidal DNA vaccine is an alternative strategy to conventional DNA vaccine and can be considered a promising approach for the development of an efficacious vaccine against PrV.
Xiao
Shaobo
S
Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Hubei, Wuhan 430070, PR China.
Chen
Huanchun
H
Fang
Liurong
L
Liu
Chuanshuang
C
Zhang
Hui
H
Jiang
Yunbo
Y
Hong
Wenzhou
W
D000818:Animals; D000914:Antibodies, Viral / Q000096:biosynthesis*; D000917:Antibody Formation / Q000276:immunology; D000956:Antigens, Viral / Q000276:immunology; D017209:Apoptosis / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D053938:DNA Fragmentation; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D011558:Herpesvirus 1, Suid / Q000235:genetics* / Q000276:immunology*; D007108:Immune Tolerance; D007111:Immunity, Cellular / Q000276:immunology; D007371:Interferon-gamma / Q000378:metabolism; D008214:Lymphocytes / Q000187:drug effects; D051379:Mice; D008807:Mice, Inbred BALB C; D009500:Neutralization Tests; D010957:Plasmids / Q000235:genetics; D011557:Pseudorabies / Q000276:immunology / Q000517:prevention & control; D022421:Pseudorabies Vaccines / Q000276:immunology*; D014162:Transfection; D019444:Vaccines, DNA / Q000276:immunology*; D014759:Viral Envelope Proteins / Q000235:genetics*
D000914:Antibodies, Viral; D000956:Antigens, Viral; D022421:Pseudorabies Vaccines; D019444:Vaccines, DNA; D014759:Viral Envelope Proteins; C038535:glycoprotein gC, herpes simplex virus type 1; D007371:Interferon-gamma