Oncogenesis and Hematological Malignancies
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Plasmin is the central enzyme of the fibrinolytic system. Its main and specific function is to degrade fibrin, the insoluble protein mesh that forms the structure of a blood clot. Plasmin cleaves fibrin at multiple sites, breaking it down into soluble fragments called fibrin degradation products (FDPs), including D-dimers. This process, called fibrinolysis, dissolves the clot and restores normal blood flow once healing has occurred. Plasmin is generated from its inactive precursor, plasminogen, by activators like tissue plasminogen activator (t-PA). Its activity is tightly controlled by inhibitors like alpha-2-antiplasmin to prevent excessive bleeding. While plasmin can also degrade other proteins like fibrinogen and some clotting factors, its primary and most important role is fibrin cleavage.
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