A consecutive priming-boosting vaccination of mice with simian immunodeficiency virus (SIV) gag/pol DNA and recombinant vaccinia virus strain DIs elicits effective anti-SIV immunity.
To evaluate immunity induced by a novel DNA prime-boost regimen, we constructed a DNA plasmid encoding the gag and pol genes from simian immunodeficiency virus (SIV) (SIVgag/pol DNA), in addition to a replication-deficient vaccinia virus strain DIs recombinant expressing SIV gag and pol genes (rDIsSIVgag/pol). In mice, priming with SIVgag/pol DNA, followed by rDIsSIVgag/pol induced an SIV-specific lymphoproliferative response that was mediated by a CD4+-T-lymphocyte subset. Immunization with either vaccine alone was insufficient to induce high levels of proliferation or Th1 responses in the animals. The prime-boost regimen also induced SIV Gag-specific cellular responses based on gamma interferon secretion, as well as cytotoxic-T-lymphocyte responses. Thus, the regimen of DNA priming and recombinant DIs boosting induced Th1-type cell-mediated immunity, which was associated with resistance to viral challenge with wild-type vaccinia virus expressing SIVgag/pol, suggesting that this new regimen may hold promise as a safe and effective vaccine against human immunodeficiency virus type 1.
Someya
Kenji
K
AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan.
Xin
Ke-Qin
KQ
Matsuo
Kazuhiro
K
Okuda
Kenji
K
Yamamoto
Naoki
N
Honda
Mitsuo
M
D016915:AIDS Vaccines / Q000235:genetics; D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D005260:Female; D015750:Genes, gag; D015751:Genes, pol; D005822:Genetic Vectors; D015497:HIV-1 / Q000276:immunology; D006801:Humans; D007117:Immunization, Secondary; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D011995:Recombination, Genetic; D018449:SAIDS Vaccines / Q000008:administration & dosage* / Q000235:genetics; D015302:Simian Immunodeficiency Virus / Q000235:genetics / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology; D019444:Vaccines, DNA / Q000008:administration & dosage* / Q000235:genetics; D014616:Vaccinia virus / Q000235:genetics / Q000276:immunology*
D016915:AIDS Vaccines; D018449:SAIDS Vaccines; D019444:Vaccines, DNA