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

BMC Systems Biology
Alexey M ShibekoF I Ataullakhanov

Abstract

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. 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. This mechanism explains the difference between red and white thrombi observed in vivo at different shear rates. It can be speculated ...Continue Reading

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Citations

Aug 21, 2013·Blood Cells, Molecules & Diseases·Gauri Khandekar, Pudur Jagadeeswaran
Dec 28, 2010·Canadian Journal of Physiology and Pharmacology·Hortensia ZelayaGraciela Agüero
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