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Broze GJ Jr., Tissue factor pathway inhibitor and the current concept of blood coagulation. Blood Coagulation & Fibrinolysis. 6 Suppl 1:S7-13, 1995.
Tissue factor pathway inhibitor (TFPI) is a multivalent, Kunitz-type plasma proteinase inhibitor that regulates tissue factor-induced coagulation. TFPI directly inhibits activated factor X and, in a factor Xa-dependent manner, produces feedback inhibition of the factor VIIa/tissue factor catalytic complex. The properties of this inhibitor help explain the clinical need for 'extrinsic' and 'intrinsic' coagulation pathways and have led to a reformulation of the coagulation cascade. In the revised hypothesis, factor VIIa/tissue factor is responsible for the initiation of coagulation but, owing to TFPI-mediated feedback inhibition, amplification of the procoagulant response though the actions of factor VIII, IX and XI is required for sustained hemostasis.
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