Expression of functional tissue factor by neutrophil extracellular traps in culprit artery of acute myocardial infarction
- PMID: 25660055
- PMCID: PMC4458286
- DOI: 10.1093/eurheartj/ehv007
Expression of functional tissue factor by neutrophil extracellular traps in culprit artery of acute myocardial infarction
Abstract
Aims: Neutrophil extracellular traps (NETs) are chromatin filaments released by activated polymorphonuclear neutrophils (PMNs) and decorated with granule proteins with various properties. Several lines of evidence implicate NETs in thrombosis. The functional significance and the in vivo relevance of NETs during atherothrombosis in humans have not been addressed until now.
Methods and results: Selective sampling of thrombotic material and surrounding blood from the infarct-related coronary artery (IRA) and the non-IRA was performed during primary percutaneous revascularization in 18 patients with ST-segment elevation acute myocardial infarction (STEMI). Thrombi isolated from IRA contained PMNs and NETs decorated with tissue factor (TF). Although TF was expressed intracellularly in circulating PMNs of STEMI patients, active TF was specifically exposed by NETs obtained from the site of plaque rupture. Treatment of NET structures with DNase I abolished TF functionality measurement. In vitro treatment of control PMNs with plasma obtained from IRA and non-IRA was further shown to induce intracellular up-regulation of TF but not NET formation. A second step consisting of the interaction between PMNs and thrombin-activated platelets was required for NET generation and subsequent TF exposure.
Conclusion: The interaction of thrombin-activated platelets with PMNs at the site of plaque rupture during acute STEMI results in local NET formation and delivery of active TF. The notion that NETs represent a mechanism by which PMNs release thrombogenic signals during atherothrombosis may offer novel therapeutic targets.
Keywords: Inflammation; Myocardial infarction; Neutrophil extracellular traps; Thrombosis; Tissue factor.
© The Author 2015. Published by Oxford University Press on behalf of the European Society of Cardiology.
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Comment in
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Neutrophil extracellular traps: a new source of tissue factor in atherothrombosis.Eur Heart J. 2015 Jun 7;36(22):1364-6. doi: 10.1093/eurheartj/ehv105. Epub 2015 Apr 5. Eur Heart J. 2015. PMID: 25845929 No abstract available.
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