Tissue factor and Toll-like receptor (TLR)4 in hyperglycaemia-hyperinsulinaemia

Anamika Singh; Guenther Boden; A. Koneti Rao

doi:10.1160/TH14-10-0884

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2015; 113(04): 750-758
DOI: 10.1160/TH14-10-0884

Coagulation and Fibrinolysis

Schattauer GmbH

Tissue factor and Toll-like receptor (TLR)4 in hyperglycaemia-hyperinsulinaemia

Effects in healthy subjects, and type 1 and type 2 diabetes mellitus

Authors

Anamika Singh

¹Sol Sherry Thrombosis Research Center, Temple University School of Medicine, Philadelphia, Pennsylvania, USA
Guenther Boden

²Division of Endocrinology/Diabetes/Metabolism and the Clinical Research Center, Temple University School of Medicine, Philadelphia, Pennsylvania, USA
A. Koneti Rao

²Division of Endocrinology/Diabetes/Metabolism and the Clinical Research Center, Temple University School of Medicine, Philadelphia, Pennsylvania, USA

³Division of Hematology, Temple University School of Medicine, Philadelphia, Pennsylvania, USA

Abstract

Summary

Diabetes mellitus (DM) patients have an increased incidence of cardiovascular events. Blood tissue factor-procoagulant activity (TF-PCA), the initiating mechanism for blood coagulation, is elevated in DM. We have shown that hyperglycaemia (HG), hyperinsulinaemia (HI) and combined HG+HI (induced using 24-hour infusion clamps) increases TF-PCA in healthy and type 2 DM (T2DM) subjects, but not in type 1 DM (T1DM) subjects. The mechanisms for this are unknown. DM patients have elevated plasma lipopolysaccharide (LPS), a toll-like receptor (TLR) 4 ligand. We postulated that TLR4 plays a role in modulating TF levels. We studied the effect of HG+HI on TLR4 and TF-PCA in vivo during 24-hour HG+HI infusion clamps in healthy subjects, and T1DM and T2DM subjects, and in vitro in blood. In vivo, in healthy subjects, 24-hour HG + HI infusion increased TLR4 six-fold, which correlated with TF-PCA (r=0.91, p<0.0001). T2DM patients showed smaller increases in both. In T1DM subjects, TLR4 declined (50%, p<0.05) and correlated with TF-PCA (r=0.55; p<0.05). In vitro, HG (200 mg/dl added glucose) and HI (1-100 nM added insulin) increased TF-PCA in healthy subjects (˜2-fold, 2-4 hours). Insulin inhibited by ~30% LPSinduced increase in TF-PCA and high glucose reversed it. TLR4 levels paralleled TF-PCA (r=0.71, p<0.0001); HG and HI increased TLR4 and insulin inhibited LPS-induced TLR4 increase. This is first evidence that even in healthy subjects, HG of short duration increases TLR4 and TFPCA, key players in inflammation and thrombosis. TLR4-TF interplay is strikingly different in non-diabetic, T1DM and T2DM subjects.

Keywords

Diabetes mellitus - hyperglycaemia - hyperinsulinaemia - tissue factor - Toll-like receptor-4

Full Text

References

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