Characterization of recent and minimally passaged Brazilian dengue viruses inducing robust infection in rhesus macaques

PLoS One. 2018 Apr 25;13(4):e0196311. doi: 10.1371/journal.pone.0196311. eCollection 2018.

Abstract

The macaque is widely accepted as a suitable model for preclinical characterization of dengue vaccine candidates. However, the only vaccine for which both preclinical and clinical efficacy results were reported so far showed efficacy levels that were substantially different between macaques and humans. We hypothesized that this model's predictive capacity may be improved using recent and minimally passaged dengue virus isolates, and by assessing vaccine efficacy by characterizing not only the post-dengue virus challenge viremia/RNAemia but also the associated-cytokine profile. Ten recent and minimally passaged Brazilian clinical isolates from the four dengue virus serotypes were tested for their infectivity in rhesus macaques. For the strains showing robust replication capacity, the associated-changes in soluble mediator levels, and the elicited dengue virus-neutralizing antibody responses, were also characterized. Three isolates from dengue virus serotypes 1, 2 and 4 induced viremia of high magnitude and longer duration relative to previously reported viremia kinetics in this model, and robust dengue virus-neutralizing antibody responses. Consistent with observations in humans, increased MCP-1, IFN-γ and VEGF-A levels, and transiently decreased IL-8 levels were detected after infection with the selected isolates. These results may contribute to establishing a dengue macaque model showing a higher predictability for vaccine efficacy in humans.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies, Neutralizing / blood
  • Antibodies, Viral / blood
  • Brazil
  • Chemokine CCL2 / metabolism
  • Chlorocebus aethiops
  • Dengue / pathology*
  • Dengue / veterinary
  • Dengue Virus / immunology*
  • Dengue Virus / isolation & purification
  • Down-Regulation
  • Interferon-gamma / metabolism
  • Interleukin-8
  • Macaca mulatta
  • Serogroup
  • Up-Regulation
  • Vascular Endothelial Growth Factor A / metabolism
  • Vero Cells

Substances

  • Antibodies, Neutralizing
  • Antibodies, Viral
  • Chemokine CCL2
  • Interleukin-8
  • Vascular Endothelial Growth Factor A
  • Interferon-gamma

Grants and funding

This work was funded by GlaxoSmithKline Biologicals S.A. (Rixensart, Belgium) under a Cooperative Research and Development Agreement with Fiocruz (Rio de Janeiro, Brazil). GlaxoSmithKline Biologicals S.A. was involved in the study design, data collection and analysis, decision to publish and preparation of the manuscript. PFCV was partially supported by MoH and CNPq (457664/2013-4 and 303999/2016-0) grants.