Selection of novel TB vaccine candidates and their evaluation as DNA vaccines against aerosol challenge

Julia Vipond, Richard Vipond, Emma Allen-Vercoe, Simon Clark, Graham Hatch, Karen Gooch, Joanna Bacon, Toby Hampshire, Helen Shuttleworth, Nigel P. Minton, Karen Blake, Ann Williams, Phillip Marsh

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Putative TB vaccine candidates were selected from lists of genes induced in response to in vivo-like stimuli, such as low oxygen and carbon starvation or growth in macrophages, and tested as plasmid DNA vaccines for their ability to protect against Mycobacterium tuberculosis challenge in a guinea pig aerosol infection model. This vaccination method was chosen as it induces the Th1 cell-mediated immune response required against intracellular pathogens such as M. tuberculosis. Protection was assessed in the guinea pig model in terms of mycobacteria present in the lungs at 30 days post-challenge. Protection achieved by the novel candidates was compared to BCG (positive control) and saline (negative control). Four vaccines encoding for proteins such as PE and PPE proteins, a zinc metalloprotease and an acyltransferase, gave a level of protection that was statistically better than saline in the lungs. These findings have enabled us to focus on a sub-set of vaccine candidates for further evaluation using additional vaccination strategies.

Original languageEnglish
Pages (from-to)6340-6350
Number of pages11
JournalVaccine
Volume24
Issue number37-39
DOIs
Publication statusPublished - 11 Sep 2006

Keywords

  • DNA vaccine
  • Guinea pig
  • Mycobacterium tuberculosis

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