title: Enhanced cellular immune responses to SIV Gag by immunization with influenza and vaccinia virus recombinants.
abstract: An effective vaccination strategy against human immunodeficiency virus type 1 (HIV-1) should include the induction of potent cellular immune responses against conserved HIV-1 antigens. We have generated five replication competent recombinant influenza viruses (rFlu/SIV Gag nos. 1-5) expressing different portions of Gag of simian immunodeficiency virus (SIV). Single intranasal immunizations in mice with each rFlu/SIV Gag viruses resulted in different degrees of protection against a challenge with recombinant vaccinia virus expressing SIV Gag. Immunized BALB/c mice had detectable CD8+ T cell responses specific for Gag peptide 185-199 when mice were vaccinated with rFlu/SIV Gag no. 3 virus, and for Gag peptides 281-295 and 285-299 when vaccinated with rFlu/SIV Gag no. 4 virus. Cellular immune responses against SIV Gag were further enhanced by a booster with a recombinant vaccinia virus expressing SIV Gag in both the spleen and local lymph node tissues, resulting in the induction of robust Gag-specific CD8+ T cell responses at both systemic and mucosal levels. We suggest that a prime-boost immunization regimen using recombinant influenza and vaccinia viruses expressing HIV Gag might represent an effective means to induce potent HIV-specific, protective CD8+ T cell responses.
authors.affiliation: Department of Microbiology, Mount Sinai School of Medicine, Box 1124, One Gustave L. Levy Place, New York, NY 10029, USA.
authors.forename: Yurie
authors.initials: Y
authors.lastname: Nakaya
authors.forename: Hongyong
authors.initials: H
authors.lastname: Zheng
authors.forename: Adolfo
authors.initials: A
authors.lastname: García-Sastre
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D017931:DNA Primers; D005260:Female; D015683:Gene Products, gag / Q000276:immunology*; D007111:Immunity, Cellular; D007252:Influenza Vaccines / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016097:Simian Acquired Immunodeficiency Syndrome / Q000276:immunology / Q000517:prevention & control; D015302:Simian Immunodeficiency Virus / Q000276:immunology*; D013997:Time Factors; D014614:Vaccines, Synthetic / Q000276:immunology*; D014616:Vaccinia virus / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology
chemical_list: D017931:DNA Primers; D015683:Gene Products, gag; D007252:Influenza Vaccines; D010446:Peptide Fragments; D014614:Vaccines, Synthetic; D014765:Viral Vaccines