Potentiation of Simian Immunodeficiency Virus (SIV)-specific CD4+ and CD8+ T cell responses by a DNA-SIV and NYVAC-SIV prime/boost regimen

Academic Article


  • T cell-mediated immune responses play an important role in the containment of HIV-1 replication. Therefore, an effective vaccine against HIV-1 should be able to elicit high frequencies of virus-specific CD8+ and CD4+ T cells. The highly attenuated poxvirus-based vaccine candidate, NYVAC-SIV-gag-pol-env (NYVAC-SIV-gpe), has been shown to induce and/or expand SIV-specific CD4+ and CD8+ T cell responses in both naive and infected macaques. In this study, the immunogenicity of NYVAC-SIV-gpe alone was compared with a combination regimen where priming with an optimized DNA-SIV-gag-env vaccine candidate was followed by a NYVAC-SIV-gpe boost. In macaques immunized with the prime-boost regimen, the extent and durability of CD8+ T cell response to an immunodominant SIV gag epitope was increased and these animals recognized a broader array of sub-dominant SIV epitopes in the cytolytic assay. In addition, the prime-boost regimen significantly enhanced the proliferative responses to both SIV gag and env proteins. Thus, the combination of these vaccine modalities may represent a valuable strategy in the development of a vaccine for HIV.
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Hel Z; Tsai WP; Thornton A; Nacsa J; Giuliani L; Tryniszewska E; Poudyal M; Venzon D; Wang X; Altman J
  • Start Page

  • 7180
  • End Page

  • 7191
  • Volume

  • 167
  • Issue

  • 12