Hemostasis pathway

The hemostasis pathway is a coordinated sequence of events involving vasoconstriction, platelet plug formation, and activation of the coagulation cascade, ultimately leading to the formation and stabilization of a fibrin clot to stop blood loss following vessel injury. It consists of two major molecular cascades—intrinsic and extrinsic—both converging on a common pathway that activates thrombin and results in fibrin clot formation. This pathway incorporates numerous enzymes (mainly serine proteases), glycoproteins, platelets, and regulatory factors, making it essential for life and highly complex to manipulate therapeutically. Defects or imbalances can lead to bleeding disorders (like hemophilia) or thrombotic diseases (like myocardial infarction or stroke). Existing drugs and therapies usually target specific molecules within this system, rather than the pathway as a whole.

Other names

Coagulation pathwayBlood coagulation pathwayClotting cascadeCoagulation cascade

Direct inhibition of specific coagulation factor activity (e.g., thrombin inhibitors, Xa inhibitors) Replacement of deficient coagulation proteins (factor replacement in hemophilia) Enhancement of fibrinolysis (tPA) Inhibition of platelet activation/aggregation (antiplatelet drugs) Gene transfer to restore clotting function (gene therapy)