Blunted expression of miR-199a-5p in regulatory T cells of patients with chronic obstructive pulmonary disease compared to unaffected smokers.

Abstract:

:Chronic obstructive pulmonary disease (COPD) is characterized by an abnormal regulatory T cell (T(reg)) response and increases in T helper type 1 (Th1) and Th17 cell responses. It is unclear if dysregulation of microRNAs (miRNA) within T(reg) cells contributes to the abnormal inflammatory response in COPD. In this study, we aimed to compare the miRNA profile of COPD T(reg) cells with that of healthy controls and to explore the function of differentially expressed miRNAs. We first obtained T(reg) and T effector cells (Teff ) from peripheral blood of non-smokers, unaffected current smokers and COPD current smokers. Then, we assessed their miRNA expression by microarray analysis followed by real-time reverse transcription-polymerase chain reaction (RT-PCR) validation of particular miRNAs. Six and 96 miRNAs were expressed differentially in COPD T(reg) cells versus T(reg) cells of healthy non-smokers and healthy smokers, whereas no differences were found in miRNA expression in T(eff) cells. We found that miR-199a-5p was repressed by approximately fourfold in T(reg) cells of COPD patients compared to healthy smokers (P < 0·05). In addition, miR-199a-5p was over-expressed in T(reg) cells compared to Teff cells (P < 0·001) and had significant over-representation of its target genes in the T(reg) transcriptome, being associated with the transforming growth factor (TGF)-β activation pathway (P < 0·01). We also confirmed the function of miR-199a5p in an in-vitro loss-of-function cell model running TaqMan® arrays of the human TGF-β pathway. These findings suggest that the abnormal repression of miR-199a-5p in patients with COPD compared to unaffected smokers may be involved in modulating the adaptive immune balance in favour of a Th1 and Th17 response.

journal_name

Clin Exp Immunol

authors

Chatila WM,Criner GJ,Hancock WW,Akimova T,Moldover B,Chang JK,Cornwell W,Santerre M,Rogers TJ

doi

10.1111/cei.12325

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

341-52

issue

1

eissn

0009-9104

issn

1365-2249

journal_volume

177

pub_type

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