Immune response induced by a different combined immunization of HBsAg vaccine.
OBJECTIVE
To evaluate the immune responses induced by different combined immunizations of HBsAg protein vaccine (P), recombinant vaccinia virus vaccine (V) and DNA vaccine (D).


METHODS
Balb/c mice were primed by one of the three HBsAg vaccines P, V or D and boosted by the same or another, thus nine immune combinations were constructed. Titers of anti-HBsAg IgG and their sub-isotypes were determined by ELISA. Specific cellular immune responses were determined by calcein-release assay.


RESULTS
V could induce the quickest humoral immune response with the geometrical mean titer of 1:10(1.6) at week 2 after prime immunization. The antibody titer primed by P (including PP, PV, PD) mounted up to the highest after the first boost. Antibody induced by PP was more polarized to Th2 while the other groups induced balanced Th1/Th2 response. Among all the groups, VD and DV induced the strongest CTL response. After the fourth boost, the specific lysis ratio was 64 and 71% separately at an E:T ratio of 1:1.


CONCLUSIONS
P was the most potent for inducing humoral immune response while the weakest for CTL response. D was a poor immunogen to induce specific antibody production. Among all the immune combinations, DV and VD induced the strongest CTL response in Balb/c mice.
Wu
Ting
T
National Institute of Diagnostics and Vaccine Development in Infectious Diseases, Xiamen University, Xiamen, China.
Chen
Min
M
Ou
Shan-Hai
SH
Cheng
Tong
T
Zhang
Jun
J
Xia
Ning-Shao
NS
D000818:Animals; D003601:Cytotoxicity Tests, Immunologic; D003602:Cytotoxicity, Immunologic; D004279:DNA, Viral / Q000235:genetics; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D016679:Genome, Viral / Q000235:genetics; D006510:Hepatitis B Antibodies / Q000097:blood; D006514:Hepatitis B Surface Antigens / Q000235:genetics / Q000276:immunology*; D017325:Hepatitis B Vaccines / Q000276:immunology*; D006515:Hepatitis B virus / Q000235:genetics; D007114:Immunization / Q000379:methods; D007117:Immunization, Secondary; D007074:Immunoglobulin G / Q000097:blood; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA; D019444:Vaccines, DNA / Q000276:immunology*; D022223:Vaccines, Subunit / Q000276:immunology; D014614:Vaccines, Synthetic / Q000276:immunology*; D014616:Vaccinia virus / Q000235:genetics
D004279:DNA, Viral; D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D017325:Hepatitis B Vaccines; D007074:Immunoglobulin G; D019444:Vaccines, DNA; D022223:Vaccines, Subunit; D014614:Vaccines, Synthetic