alexa Platelets and plasminogen activation.
General Science

General Science

Journal of Bioterrorism & Biodefense

Author(s): Loscalzo J, Pasche B, Ouimet H, Freedman JE

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Abstract Platelets serve as a site for assembly of the proteins of the plasminogen activator system. Once bound to the platelet surface, tissue-type plasminogen activator manifests enhanced catalytic activity. Plasmin, once formed, also binds to the platelets surface and, at low concentrations, renders the platelet dysfunctional by cleaving glycoprotein IIIa selectively in the presence of bound fibrinogen. At higher concentrations (approximately 1 caseinolytic unit/ml), plasmin activates the platelet directly. Activated platelets also bind plasminogen and tissue-type plasminogen activator, and manifest enhanced catalytic efficiency of plasminogen activation. These observations suggest that plasminogen activation by tissue-type plasminogen activator is an autocatalytic process on the platelet surface, and that unique reciprocating mechanisms govern the interaction between platelets and the components of the plasminogen activator system.
This article was published in Thromb Haemost and referenced in Journal of Bioterrorism & Biodefense

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