About: Tenase

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In coagulation, the procoagulant protein factor X can be activated into factor Xa in two ways: either extrinsically or intrinsically. The activating complexes are together called tenase. Tenase is a blend word of "ten" and the suffix "-ase", which means, that the complex activates its substrate (inactive factor X) by cleaving it. Extrinsic tenase complex is made up of tissue factor, factor VII, and Ca2+ as an activating ion.

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  • Der Tenasekomplex ist ein aus mehreren Faktoren zusammengesetzter Baustein der sekundären Hämostase (plasmatischen Gerinnung).Der Tenasekomplex besteht aus vier Faktoren: * Christmas-Faktor (Faktor IX), * Antihämophiles Globulin A (Faktor VIII), * Phospholipide und * Calciumionen Der Tenasekomplex befindet sich auf der Oberfläche aktivierter Thrombozyten, da hier die nötigen Phospholipide in der Zellmembran zu finden sind. Seine Aufgabe ist letzten Endes die Aktivierung des Stuart-Prower-Faktors (Faktor X), der wiederum Teil des Prothrombinasekomplexes ist.Da Thrombin als zentraler Angelpunkt der plasmatischen Gerinnung selbst direkt und indirekt für die Aktivierung des Tenasekomplexes zuständig ist, und dieser anschließend teilweise den Prothrombinasekomplex aktiviert, der zuletzt wieder Thrombin aktiviert, handelt es sich um einen sich selbstverstärkenden Mechanismus. (de)
  • In coagulation, the procoagulant protein factor X can be activated into factor Xa in two ways: either extrinsically or intrinsically. The activating complexes are together called tenase. Tenase is a blend word of "ten" and the suffix "-ase", which means, that the complex activates its substrate (inactive factor X) by cleaving it. Extrinsic tenase complex is made up of tissue factor, factor VII, and Ca2+ as an activating ion. Intrinsic tenase complex contains the active factor IX (IXa), its cofactor factor VIII (VIIIa), the substrate (factor X), and they are activated by negatively charged surfaces (such as glass, active platelet membrane, sometimes cell membrane of monocytes). These vitamin K-dependent procoagulant factors dock to this surface through their Gla domain with Ca2+ bridges. (en)
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  • Der Tenasekomplex ist ein aus mehreren Faktoren zusammengesetzter Baustein der sekundären Hämostase (plasmatischen Gerinnung).Der Tenasekomplex besteht aus vier Faktoren: * Christmas-Faktor (Faktor IX), * Antihämophiles Globulin A (Faktor VIII), * Phospholipide und * Calciumionen (de)
  • In coagulation, the procoagulant protein factor X can be activated into factor Xa in two ways: either extrinsically or intrinsically. The activating complexes are together called tenase. Tenase is a blend word of "ten" and the suffix "-ase", which means, that the complex activates its substrate (inactive factor X) by cleaving it. Extrinsic tenase complex is made up of tissue factor, factor VII, and Ca2+ as an activating ion. (en)
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  • Tenase (en)
  • Tenasekomplex (de)
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