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Published in: Cardiovascular Diabetology 1/2016

Open Access 01-12-2016 | Original investigation

Impaired coronary microcirculation in type 2 diabetic patients is associated with elevated circulating regulatory T cells and reduced number of IL-21R+ T cells

Authors: Bernt Johan von Scholten, Alexander Rosendahl, Philip Hasbak, Regine Bergholdt, Andreas Kjaer, Peter Rossing, Tine W. Hansen

Published in: Cardiovascular Diabetology | Issue 1/2016

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Abstract

Background

Low-grade systemic inflammation is considered to participate in the progression of type 2 diabetes (T2D) and in diabetic complications.

Methods

To determine if circulating leukocytes were abnormally regulated in T2D patients, 8-color flow-cytometry (FACS) analysis was performed in a cross-sectional study of 37 T2D patients and 16 controls. Data obtained from the FACS analysis were compared to coronary flow reserve (CFR), assessed by Rb82-PET-imaging, to uncover inflammatory signatures associated with impaired CFR.

Results

Presence of T2D was associated with T cell attenuation characterized by reduced overall T cell, Th17, IL-21R+, Treg’s and TLR4+ T cells, while the monocyte population showed enhanced TLR4 expression. Further, our data revealed reduced M1-like CD11c expression in T2D which was associated with impaired CFR. In contrast, we show, for the first time in T2D, increased TLR4 expression on CD8 T cells, increased Treg cell number and Treg maturation and reduced IL-21R expression on CD8 T cells to be functionally associated with impaired CFR.

Conclusions

Our demonstration that HbA1c inversely correlates to several T cell populations suggests that T cells may play disease modulating roles in T2D. Further, the novel association between impaired CFR and regulatory T cells and IL-21R+ T cells imply an intricate balance in maintaining tissue homeostasis in vascular diabetic complications.
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Metadata
Title
Impaired coronary microcirculation in type 2 diabetic patients is associated with elevated circulating regulatory T cells and reduced number of IL-21R+ T cells
Authors
Bernt Johan von Scholten
Alexander Rosendahl
Philip Hasbak
Regine Bergholdt
Andreas Kjaer
Peter Rossing
Tine W. Hansen
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Cardiovascular Diabetology / Issue 1/2016
Electronic ISSN: 1475-2840
DOI
https://doi.org/10.1186/s12933-016-0378-5

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