IL‐27 and TGFβ mediated expansion of Th1 and adaptive regulatory T cells expressing IL‐10 correlates with bacterial burden and disease severity in pulmonary …

NP Kumar, K Moideen, VV Banurekha… - Immunity …, 2015 - Wiley Online Library
NP Kumar, K Moideen, VV Banurekha, D Nair, R Sridhar, TB Nutman, S Babu
Immunity, Inflammation and Disease, 2015Wiley Online Library
CD4+ T cell expression of IL‐10 is an important mechanism controlling immunity to
tuberculosis (TB). To identify the CD4+ T cell subsets producing IL‐10 in human TB, we
enumerated the frequencies of IL‐10 expressing CD4+ T cell subsets following TB—antigen
stimulation of cells from individuals with pulmonary (PTB) and latent TB (LTB). We first
demonstrate that TB antigens induce an expansion of IL‐10 expressing Th1 (IL‐10+, IFNγ+,
T‐bet+), Th2 (IL‐10+, IL‐4+, GATA‐3+), Th9 (IL‐10+, IL‐9+, IL‐4−), Th17 (IL‐10+, IL‐17+ …
Abstract
CD4+ T cell expression of IL‐10 is an important mechanism controlling immunity to tuberculosis (TB). To identify the CD4+ T cell subsets producing IL‐10 in human TB, we enumerated the frequencies of IL‐10 expressing CD4+ T cell subsets following TB—antigen stimulation of cells from individuals with pulmonary (PTB) and latent TB (LTB). We first demonstrate that TB antigens induce an expansion of IL‐10 expressing Th1 (IL‐10+, IFNγ+, T‐bet+), Th2 (IL‐10+, IL‐4+, GATA‐3+), Th9 (IL‐10+, IL‐9+, IL‐4), Th17 (IL‐10+, IL‐17+, IFNγ), and natural and adaptive regulatory T cells [nTregs; IL‐10+, CD4+, CD25+, Foxp3+ and aTregs; IL‐10 single+, CD4+, CD25, Foxp3] in PTB and LTB individuals, with frequencies being significantly higher in the former. However, only Th1 cells and adaptive Tregs expressing IL‐10 exhibit a positive relationship with bacterial burdens and extent of disease in PTB. Finally, we show that IL‐27 and TGFβ play an important role in the regulation of IL‐10+ Th cell subsets. Thus, active PTB is characterized by an IL‐27 and TGFβ mediated expansion of IL‐10 expressing CD4+ T cell subsets, with IL‐10+ Th1 and IL‐10+ aTreg cells playing a potentially pivotal role in the pathogenesis of active disease.
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