A non-human primate in vitro functional assay for the early evaluation of TB vaccine candidates

Rachel Tanner, Andrew D. White, Charelle Boot, Claudia C. Sombroek, Matthew K. O’Shea, Daniel Wright, Emily Hoogkamer, Julia Bitencourt, Stephanie A. Harris, Charlotte Sarfas, Rachel Wittenberg, Iman Satti, Helen A. Fletcher, Frank A.W. Verreck, Sally Sharpe, Helen McShane

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We present a non-human primate mycobacterial growth inhibition assay (MGIA) using in vitro blood or cell co-culture with the aim of refining and expediting early tuberculosis vaccine testing. We have taken steps to optimise the assay using cryopreserved peripheral blood mononuclear cells, transfer it to end-user institutes, and assess technical and biological validity. Increasing cell concentration or mycobacterial input and co-culturing in static 48-well plates compared with rotating tubes improved intra-assay repeatability and sensitivity. Standardisation and harmonisation efforts resulted in high consistency agreements, with repeatability and intermediate precision <10% coefficient of variation (CV) and inter-site reproducibility <20% CV; although some systematic differences were observed. As proof-of-concept, we demonstrated ability to detect a BCG vaccine-induced improvement in growth inhibition in macaque samples, and a correlation between MGIA outcome and measures of protection from in vivo disease development following challenge with either intradermal BCG or aerosol/endobronchial Mycobacterium tuberculosis (M.tb) at a group and individual animal level.

Original languageEnglish
Article number3
Number of pages11
Journalnpj Vaccines
Volume6
Issue number1
DOIs
Publication statusPublished - 4 Jan 2021

Keywords

  • MYCOBACTERIAL GROWTH-INHIBITION
  • PERIPHERAL-BLOOD MONOCYTES
  • TUBERCULOSIS VACCINE
  • BCG-VACCINATION
  • WHOLE-BLOOD
  • PROTECTION
  • INFECTION
  • IMMUNITY
  • CELLS
  • BOVIS

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