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Journal of Translational Medicine
Published in: Journal of Translational Medicine 1/2014

Open Access 01-12-2014 | Research

A microRNA profile of human CD8+ regulatory T cells and characterization of the effects of microRNAs on Treg cell-associated genes

Authors: Fadi Jebbawi, Hussein Fayyad-Kazan, Makram Merimi, Philippe Lewalle, Jean-Christophe Verougstraete, Oberdan Leo, Pedro Romero, Arsene Burny, Bassam Badran, Philippe Martiat, Redouane Rouas

Published in: Journal of Translational Medicine | Issue 1/2014

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Abstract

Background

Recently, regulatory T (Treg) cells have gained interest in the fields of immunopathology, transplantation and oncoimmunology. Here, we investigated the microRNA expression profile of human natural CD8+CD25+ Treg cells and the impact of microRNAs on molecules associated with immune regulation.

Methods

We purified human natural CD8+ Treg cells and assessed the expression of FOXP3 and CTLA-4 by flow cytometry. We have also tested the ex vivo suppressive capacity of these cells in mixed leukocyte reactions. Using TaqMan low-density arrays and microRNA qPCR for validation, we could identify a microRNA ‘signature’ for CD8+CD25+FOXP3+CTLA-4+ natural Treg cells. We used the ‘TargetScan’ and ‘miRBase’ bioinformatics programs to identify potential target sites for these microRNAs in the 3′-UTR of important Treg cell-associated genes.

Results

The human CD8+CD25+ natural Treg cell microRNA signature includes 10 differentially expressed microRNAs. We demonstrated an impact of this signature on Treg cell biology by showing specific regulation of FOXP3, CTLA-4 and GARP gene expression by microRNA using site-directed mutagenesis and a dual-luciferase reporter assay. Furthermore, we used microRNA transduction experiments to demonstrate that these microRNAs impacted their target genes in human primary Treg cells ex vivo.

Conclusions

We are examining the biological relevance of this ‘signature’ by studying its impact on other important Treg cell-associated genes. These efforts could result in a better understanding of the regulation of Treg cell function and might reveal new targets for immunotherapy in immune disorders and cancer.
Appendix
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Metadata
Title
A microRNA profile of human CD8+ regulatory T cells and characterization of the effects of microRNAs on Treg cell-associated genes
Authors
Fadi Jebbawi
Hussein Fayyad-Kazan
Makram Merimi
Philippe Lewalle
Jean-Christophe Verougstraete
Oberdan Leo
Pedro Romero
Arsene Burny
Bassam Badran
Philippe Martiat
Redouane Rouas
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2014
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/s12967-014-0218-x

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Live Webinar | 27-06-2024 | 18:00 (CEST)

Keynote webinar | Spotlight on medication adherence

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Live: Thursday 27th June 2024, 18:00-19:30 (CEST)

WHO estimates that half of all patients worldwide are non-adherent to their prescribed medication. The consequences of poor adherence can be catastrophic, on both the individual and population level.

Join our expert panel to discover why you need to understand the drivers of non-adherence in your patients, and how you can optimize medication adherence in your clinics to drastically improve patient outcomes.

Prof. Kevin Dolgin
Prof. Florian Limbourg
Prof. Anoop Chauhan
Developed by: Springer Medicine
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Incentivised to exercise

11-04-2024 Lifestyle Modifications News

New intervention for STEMI-related cardiogenic shock

10-04-2024 Myocardial Infarction News

» View more highlights on the ACC 2024 congress hub page

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