Abstract：
:Endothelial cells (ECs) are major modulators of hemostasis by expressing and releasing pro- and anticoagulant mediators into the circulation. Previous studies showed that cultured ECs release procoagulant mediators into cell culture supernatants as evidenced by the reduction of viscoelastic clotting time. This effect was reversed with an anti-tissue factor antibody. Here, we aimed to investigate whether tissue factor (TF) was released by endothelial-derived extracellular vesicles (EVs) and which portion of the released vesicles displays the most prominent procoagulant properties. After stimulation of ECs with tumor-necrosis factor-α (TNF-α) the supernatants of EC cultures were subjected to differential centrifugation steps to collect larger and smaller EVs which were then characterised by nanoparticle tracking analysis (NTA) and flow cytometry. Mixed with fresh human blood and analysed by thromboelastometry EVs exerted a significant procoagulant stimulus, which could be partly reversed by addition of an anti-TF antibody. Moreover, TF activity was confirmed in the centrifuged fractions. In summary, our results provide evidence of the procoagulant potential of smaller and larger endothelial-derived EV fractions detected by thromboelastometry. The observed effect is most likely due to the release of TF-bearing EVs of different dimensions, which are released upon TNF-α stimulation of endothelial cell cultures.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Holnthoner W,Bonstingl C,Hromada C,Muehleder S,Zipperle J,Stojkovic S,Redl H,Wojta J,Schöchl H,Grillari J,Weilner S,Schlimp CJdoi
10.1038/s41598-017-03159-0subject
Has Abstractpub_date
2017-06-16 00:00:00pages
3707issue
1issn
2045-2322pii
10.1038/s41598-017-03159-0journal_volume
7pub_type
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