Blood flow controls coagulation onset via the positive feedback of factor VII activation by factor Xa

Loading...
Thumbnail Image

Date

2010

Journal Title

Journal ISSN

Volume Title

Repository Usage Stats

302
views
188
downloads

Citation Stats

Abstract

Background: Blood coagulation is a complex network of biochemical reactions, which is peculiar in that it is time- and space-dependent, and has to function in the presence of rapid flow. Recent experimental reports suggest that flow plays a significant role in its regulation. The objective of this study was to use systems biology techniques to investigate this regulation and to identify mechanisms creating a flow-dependent switch in the coagulation onset. Results: Using a detailed mechanism-driven model of tissue factor (TF)-initiated thrombus formation in a two-dimensional channel we demonstrate that blood flow can regulate clotting onset in the model in a threshold-like manner, in agreement with existing experimental evidence. Sensitivity analysis reveals that this is achieved due to a combination of the positive feedback of TF-bound factor VII activation by activated factor X (Xa) and effective removal of factor Xa by flow from the activating patch depriving the feedback of "ignition". The level of this trigger (i.e. coagulation sensitivity to flow) is controlled by the activity of tissue factor pathway inhibitor. Conclusions: This mechanism explains the difference between red and white thrombi observed in vivo at different shear rates. It can be speculated that this is a special switch protecting vascular system from uncontrolled formation and spreading of active coagulation factors in vessels with rapidly flowing blood.

Department

Description

Provenance

Citation

Shibeko,Alexey M.;Lobanova,Ekaterina S.;Panteleev,Mikhail A.;Ataullakhanov,Fazoil I.. 2010. Blood flow controls coagulation onset via the positive feedback of factor VII activation by factor Xa. Bmc Systems Biology 4( ): 5-5.

Published Version (Please cite this version)

10.1186/1752-0509-4-5


Unless otherwise indicated, scholarly articles published by Duke faculty members are made available here with a CC-BY-NC (Creative Commons Attribution Non-Commercial) license, as enabled by the Duke Open Access Policy. If you wish to use the materials in ways not already permitted under CC-BY-NC, please consult the copyright owner. Other materials are made available here through the author’s grant of a non-exclusive license to make their work openly accessible.