Abstract:
:The extravascular localization of tissue factor (TF), the central initiator of coagulation, is thought to ensure that thrombus formation is prevented in the intact vessel. We observed that during a 5-min stimulation of human blood with collagen (type I), TF antigen appeared on the surface of platelets adhering to leukocytes. The rapidly presented intravascular TF was competent to start the coagulation cascade. The isolated platelets from healthy donors contained appreciable amounts of the TF protein, while no TF antigen was detected in the neutrophils and rapidly isolated monocytes. Direct interactions with the neutrophils and monocytes were apparently necessary to activate the platelet-associated TF. This was most likely mediated by inactivation of tissue factor pathway inhibitor through leukocyte elastase. In summary, the leukocyte-elicited activation of the platelet TF participates in the rapid initiation of coagulation by collagen.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Zillmann A,Luther T,Müller I,Kotzsch M,Spannagl M,Kauke T,Oelschlägel U,Zahler S,Engelmann Bdoi
10.1006/bbrc.2001.4399subject
Has Abstractpub_date
2001-02-23 00:00:00pages
603-9issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(01)94399-2journal_volume
281pub_type
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