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DOI: 10.1160/TH08-11-0759
High-mobility group box 1 protein induces tissue factor expression in vascular endothelial cells via activation of NF-κB and Egr-1
Publication History
Received:
24 August 2008
Accepted after major revision:
21 May 2009
Publication Date:
22 November 2017 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/200902/lookinside/thumbnails/10-1160-th08-11-0759-1.jpg)
Summary
High-mobility group box 1 protein (HMGB1), an abundant nuclear protein, was recently established as a proinflammatory mediator of experimental sepsis.Although extracellular HMGB1 has been found in atherosclerotic plaques, its potential role in the pathogenesis of atherothrombosis remains elusive. In the present study, we determined whether HMGB1 induces tissue factor (TF) expression in vascular endothelial cells (ECs) and macrophages. Our data showed that HMGB1 stimulated ECs to express TF (but not TF pathway inhibitor) mRNA and protein in a concentration and time-dependent manner. Blockade of cell surface receptors (including TLR4, TLR2, and RAGE) with specific neutralising antibodies partially reduced HMGB1-induced TF expression. Moreover, HMGB1 increased expression of Egr-1 and nuclear translocation of NF-κB (c-Rel/p65) in ECs. Taken together, our data suggest that HMGB1 induces TF expression in vascular endothelial cells via cell surface receptors (TLR4, TLR2, and RAGE), and through activation of transcription factors (NF-κB and Egr-1).
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