Evaluation in macaques of HIV-1 DNA vaccines containing primate CpG motifs and fowlpoxvirus vaccines co-expressing IFNgamma or IL-12

Vaccine. 2004 Nov 25;23(2):188-97. doi: 10.1016/j.vaccine.2004.05.024.

Abstract

Induction of HIV-specific T-cell responses by vaccines may facilitate efficient control of HIV. Plasmid DNA vaccines and recombinant fowlpoxvirus (rFPV) vaccines are promising HIV-1 vaccine candidates, although either vaccine alone may be insufficient to protect against HIV-1. A consecutive immunisation strategy involving priming with DNA and boosting with rFPV vaccines encoding multiple common HIV-1 antigens was further evaluated in 30 macaques. The DNA vaccine vector included CpG immunostimulatory molecules, and rFPV vaccines were compared with rFPV vaccines co-expressing the pro-T cell cytokines IFNgamma or IL-12. Vaccines expressed multiple HIV-1 genes, mutated to remove active sites of the HIV proteins. The vaccines were well tolerated, and a significant enhancement of DNA-vaccine primed HIV-1 specific T lymphocyte responses was observed following rFPV boosting. Co-expression of IFNgamma or IL-12 by the rFPV vaccines did not further enhance immune responses. Non-sterilising protection from a non-pathogenic HIV-1 challenge was observed. This study provides evidence of a safe, optimised, strategy for the generation of T-cell mediated immunity to HIV-1.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • AIDS Vaccines / administration & dosage*
  • AIDS Vaccines / genetics
  • Animals
  • DNA, Viral / analysis
  • Evaluation Studies as Topic
  • Fowlpox virus / genetics*
  • HIV Infections / immunology
  • HIV Infections / prevention & control*
  • Interleukin-12 / genetics
  • Macaca
  • T-Lymphocytes, Cytotoxic / immunology
  • Vaccines, DNA / administration & dosage*
  • Vaccines, DNA / genetics
  • Vaccines, Synthetic / immunology*
  • Vaccines, Synthetic / toxicity
  • Viral Vaccines / immunology
  • Viral Vaccines / toxicity

Substances

  • AIDS Vaccines
  • DNA, Viral
  • Vaccines, DNA
  • Vaccines, Synthetic
  • Viral Vaccines
  • Interleukin-12