posted on 2025-01-14, 09:58authored byLinda Voogd, Catherine Riou, Thomas J Scriba, Marjolein van Wolfswinkel, Krista E van Meijgaarden, Kees LMC Franken, Robert J Wilkinson, Tom HM Ottenhoff, Simone A Joosten
INTRODUCTION: Tuberculosis (TB) is the deadliest infectious disease worldwide and novel vaccines are urgently needed. HLA-E is a virtually monomorphic antigen presentation molecule and is not downregulated upon HIV co-infection. HLA-E restricted Mtb specific CD8+ T cells are present in the circulation of individuals with active TB (aTB) and Mtb infection (TBI) with or without HIV co-infection, making HLA-E restricted T cells interesting vaccination targets for TB. METHODS: Here, we performed in-depth phenotyping of HLA-E/Mtb specific and total T cell populations in individuals with TBI and in individuals with aTB or TBI and HIV using HLA-E/Mtb tetramers. RESULTS AND DISCUSSION: We show that HIV co-infection is the main driver in changing the memory distribution of HLA-E/Mtb specific CD4+ and CD8+ T cell subsets. HLA-E/Mtb specific CD4+ and CD8+ T cells were found to circulate with comparable frequencies in all individuals and displayed expression of KLRG1, PD-1 and 2B4 similar to that of total T cells. The presence of HLA-E/Mtb specific T cells in individuals with aTB and TBI highlights the potential of HLA-E as a vaccine target for TB.
Funding
Crick (Grant ID: CC2112, Grant title: Wilkinson CC2112)