Caffeine induces endothelial tissue factor expression via phosphatidylinositol 3-kinase inhibition

Cathérine Gebhard; Erik W. Holy; Giovanni G. Camici; Alexander Akhmedov; Simon F. Stämpfli; Barbara E. Stähli; Bettina von Rickenbach; Alexander Breitenstein; Helen Greutert; Zhihong Yang; Thomas F. Lüscher; Felix C. Tanner

doi:10.1160/TH11-09-0624

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2012; 107(05): 884-894
DOI: 10.1160/TH11-09-0624

Blood Coagulation, Fibrinolysis and Cellular Haemostasis

Schattauer GmbH

Caffeine induces endothelial tissue factor expression via phosphatidylinositol 3-kinase inhibition

Cathérine Gebhard

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

,

Erik W. Holy

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

,

Giovanni G. Camici

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

,

Alexander Akhmedov

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

,

Simon F. Stämpfli

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

,

Barbara E. Stähli

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

,

Bettina von Rickenbach

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

,

Alexander Breitenstein

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

,

Helen Greutert

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

,

Zhihong Yang

⁴Vascular Biology, Department of Medicine, University of Fribourg, Fribourg, Switzerland

,

Thomas F. Lüscher

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

,

Felix C. Tanner

¹Cardiovascular Research, Physiology Institute, University of Zurich, Zurich, Switzerland

²Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland

³Cardiology, Cardiovascular Center, University Hospital Zurich, Zurich, Switzerland

› Author Affiliations

Abstract

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Summary

Tissue factor (TF) is the key activator of coagulation and is involved in acute coronary syndromes. Caffeine is often reported to increase cardiovascular risk; however, its effect on cardiovascular morbidity and mortality is controversial. Hence, this study was designed to investigate the impact of caffeine on endothelial TF expression in vitro. Caffeine concentration-dependently enhanced TF protein expression and surface activity in human endothelial cells stimulated by tumour necrosis factor (TNF)-α or thrombin. Caffeine inhibited phosphatidylinositol 3-kinase (PI3K) activity and this effect was comparable to that of the known PI3K inhibitor LY294002. Consistently, treatment of endothelial cells with LY294002 enhanced TNF-α induced TF expression to a similar extent as caffeine, and adenoviral expression of the active PI3K mutant (p110) reversed the effect of both caffeine and LY294002 on TF expression. Caffeine and LY294002 increased DNA binding capacity of the transcription factor nuclear factor κB, whereas the activation pattern of mitogen-activated protein kinases (MAPK) remained unaltered. Luciferase reporter assay revealed a caffeine dependent activation of the TF promoter, and RT-PCR revealed a dose dependent increase in TF mRNA levels when stimulated with caffeine in the presence of TNF-α. In conclusion, caffeine enhances TNF-α-induced endothelial TF protein expression as well as surface activity by inhibition of PI3K signalling. Since the caffeine concentrations applied in the present study are within the plasma range measured in humans, our findings indicate that caffeine enhances the prothrombotic potential of endothelial cells and underscore the importance of PI3K in mediating these effects.

Keywords

Tissue factor / factor VII - signal transduction - coronary syndrome - endothelial cells - nutrition

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References

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