Abstract:
:The hemostatic system comprises platelet aggregation, coagulation and fibrinolysis also termed primary, secondary and tertiary hemostasis. From the platelet transcriptome 6000 mRNA species and represent receptors, ion channels, signalling molecules, kinases, phosphatases, and structural, metabolic and regulatory proteins. This abundance of regulatory proteins points towards the importance of signal transduction in platelet function. First platelets adhere to collagen, this induces activation signals such as TXA(2) that induces further Ca(2+) increase. Consecutively, fibrinogen binds to the integrin alpha(IIb)beta(3) resulting in aggregation.This self-amplifying process is controlled by signals, from endothelial cells, to restrict the platelet plug to the site of vessel injury. Secondary hemostasis (coagulation) consists of an extrinsic and intrinsic pathway. Thrombin is generated via Factor Xa resulting from the extrinsic tenase reaction that is turned of by tissue factor pathway inhibitor. While thrombin generation is maintained via positive feedback mechanisms activating factors V, VIII and XI. Excess thrombin is inhibited by antithrombin or by autodownregulation via activation of protein C. Since minor injuries are common, platelets and plasma clotting factors constantly produce clots to stop bleeding. If clots remained after the tissue healing, the vascular bed would become obstructed with clots therefore this is regulated by fibrinolysis, tertiary hemostasis. Tissue-type plasminogen activator synthesised by the endothelium, converts plasminogen to plasmin, the clot lysis enzyme. Plasmin clears the blood vessels by degrading fibrin. Fibrinolysis is controlled by plasminogen activators inhibitor (PAI-1), alpha2-antiplasmin and alpha2-macroglobulin, and thrombin-activatable fibrinolysis inhibitor (TAFI).
journal_name
Curr Med Chemjournal_title
Current medicinal chemistryauthors
Stassen JM,Arnout J,Deckmyn Hdoi
10.2174/0929867043364603subject
Has Abstractpub_date
2004-09-01 00:00:00pages
2245-60issue
17eissn
0929-8673issn
1875-533Xjournal_volume
11pub_type
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journal_title:Current medicinal chemistry
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更新日期:2014-01-01 00:00:00
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