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Thrombin-Activatable Fibrinolysis Inhibitor

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The coagulation system is a potent mechanism that prevents blood loss after vascular injury. It consists of a number of linked enzymatic reactions resulting in thrombin generation. Thrombin converts soluble fibrinogen into a fibrin clot. The clot is subsequently removed by the fibrinolytic system upon wound healing. Thrombin-activatable fibrinolysis inhibitor (TAFI), which is identical to the previously identified proteins procarboxypeptidase B, R, and U, forms a link between blood coagulation and fibrinolysis. TAFI circulates as an inactive proenzyme in the bloodstream, and becomes activated during blood clotting. The active form, TAFIa, inhibits fibrinolysis by cleaving off C-terminal lysine residues from partially degraded fibrin that stimulates the tissue-type plasminogen activator-mediated conversion of plasminogen to plasmin. Consequently, removal of these lysines leads to less plasmin formation and subsequently to protection of the fibrin clot from break down. Moreover, TAFI may also play a role in other processes such as, inflammation and tissue repair. In this review, recent developments in TAFI research are discussed.
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Keywords: carboxypeptidase; coagulation; cpb; cpr; cpu; fibrinolysis; tafi

Document Type: Review Article

Affiliations: Dept. Vascular Medicine, G1-114, Academic Medical Center, P.O. Box 22660, 1100 DD Amsterdam, The Netherlands.

Publication date: 2004-09-01

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