BCG vaccine mediated reduction in the MHC-II expression of macrophages and dendritic cells is reversed by activation of Toll-like receptors 7 and 9

Pearl Bakhru, Natalie Sirisaengtaksin, Emily Soudani, Seema Mukherjee, Arshad Khan, Chinnaswamy Jagannath

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Tuberculosis is a major cause of death in mankind and BCG vaccine protects against childhood but not adult tuberculosis. BCG avoids lysosomal fusion in macrophages decreasing peptides required for activating CD4 T cells and Th1 immunity while suppressing the expression of MHC-II by antigen presenting cells (APCs). An in vitro model of antigen presentation showed that ligands for TLR-9, 7, 4 and 1/2 increased the ability of APCs to present antigen-85B of BCG to CD4 T cells, which correlated with an increase in MHC-II expression. TLR-activation led to a down-regulation of MARCH1 ubiquitin ligase which prevents the degradation of MHC-II and decreased IL-10 also contributed to an increase in MHC-II. TLR-activation induced up-regulation of MHC-II was inhibited by the blockade of IRAK, NF-kB, and MAPKs. TLR-7 and TLR-9 ligands had the most effective adjuvant like effect on MHC-II of APCs which allowed BCG vaccine mediated activation of CD4 T cells.

Original languageEnglish (US)
Pages (from-to)53-61
Number of pages9
JournalCellular Immunology
Volume287
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • Antigen processing
  • BCG vaccine
  • CD80
  • CD86
  • Dendritic cells
  • IL-10
  • MARCH1 ubiquitin ligase
  • MHC-II
  • Macrophage
  • Toll-like receptor (TLR)

ASJC Scopus subject areas

  • Immunology

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