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

Z. Hel, W. P. Tsai, A. Thornton, J. Nacsa, L. Giuliani, E. Tryniszewska, M. Poudyal, D. Venzon, X. Wang, J. Altman, D. I. Watkins, W. Lu, A. Von Gegerfelt, B. K. Felber, J. Tartaglia, G. N. Pavlakis, G. Franchini

Research output: Contribution to journalArticlepeer-review

81 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)7180-7191
Number of pages12
JournalJournal of Immunology
Issue number12
StatePublished - Dec 15 2001
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

Fingerprint Dive into the research topics of 'Potentiation of Simian Immunodeficiency Virus (SIV)-specific CD4<sup>+</sup> and CD8<sup>+</sup> T cell responses by a DNA-SIV and NYVAC-SIV prime/boost regimen'. Together they form a unique fingerprint.

Cite this