Synergy Between Tissue Factor and Exogenous Factor XIa in Initiating Coagulation

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Synergy Between Tissue Factor and Exogenous Factor XIa in Initiating Coagulation.

OBJECTIVE Recent evidence suggests involvement of coagulation factor XIa (FXIa) in thrombotic event development. This study was conducted to explore possible synergies between tissue factor (TF) and exogenous FXIa (E-FXIa) in thrombin generation. APPROACH AND RESULTS In thrombin generation assays, for increasing concentrations of E-FXIa with low, but not with high TF concentrations, peak thro...

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The effect of platelets in the activation of human blood coagulation factor IX by factor XIa.

We report here the effect of activated human platelets on the activation of human factor IX by human factor XIa. Factor IXa formed during activation was determined via its ability to activate bovine factor X. To increase sensitivity, phospholipids and bovine factor VIIIa were present in the assay. The kinetic parameters of the factor IX activation were determined in the presence of 10 mmol/L Ca...

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The Association between Preeclampsia and Defined Polymorphisms in Prothrombin and Coagulation Factor V Genes

Background & Aims: Preeclampsia is one of the complications of pregnancy and a major cause of maternal mortality. Since, hypercoagulation is one of the risk factors, defined polymorphisms of V and II coagulation factors (G1691A and G20210A) may increase the risk of the disease. Methods: This investigation was performed on blood samp...

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The tissue factor requirement in blood coagulation.

Formation of thrombin is triggered when membrane-localized tissue factor (TF) is exposed to blood. In closed models of this process, thrombin formation displays an initiation phase (low rates of thrombin production cause platelet activation and fibrinogen clotting), a propagation phase (>95% of thrombin production occurs), and a termination phase (prothrombin activation ceases and free thrombin...

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Tissue factor in coagulation: Which? Where? When?

Tissue factor (TF) is an integral membrane protein, normally separated from the blood by the vascular endothelium, which plays a key role in the initiation of blood coagulation. With a perforating vascular injury, TF becomes exposed to blood and binds plasma factor VIIa. The resulting complex initiates a series of enzymatic reactions leading to clot formation and vascular sealing. In some patho...

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ژورنال

عنوان ژورنال: Arteriosclerosis, Thrombosis, and Vascular Biology

سال: 2016

ISSN: 1079-5642,1524-4636

DOI: 10.1161/atvbaha.116.308186