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These then bind their respective receptors on platelet surfaces, in both an autocrine and paracrine fashion (binds both itself and other platelets). The binding of these receptors result in a cascade of events resulting in an increase in intracellular calcium (e.g. via G q receptor activation leading to Ca 2+ release from platelet endoplasmic ...
The widely used drug aspirin acts by inhibiting the ability of the COX enzyme to synthesize the precursors of thromboxane within platelets. Low-dose, long-term aspirin use irreversibly blocks the formation of thromboxane A 2 in platelets, producing an inhibitory effect on platelet aggregation. This anticoagulant property makes aspirin useful ...
Activated platelets contract their internal actin and myosin fibrils in their cytoskeleton, which leads to shrinkage of the clot volume. Plasminogen activators , such as tissue plasminogen activator (t-PA), activate plasminogen into plasmin, which promotes lysis of the fibrin clot; this restores the flow of blood in the damaged/obstructed blood ...
The IIb / IIIa complex is a major platelet membrane component. There are as many as 50 000 copies. The α IIb (GPIIb) is composed of two subunits linked by disulfide bridges. The β 3 (GPIIIa) forms a single polypeptide chain. These subunits form Ca 2+ - dependent complex on the surface of platelet membrane in a 1:1 ratio.
Platelet plug formation: Platelets adhere to damaged endothelium to form a platelet plug (primary hemostasis) and then degranulate. This process is regulated through thromboregulation. Plug formation is activated by a glycoprotein called von Willebrand factor (vWF), which is found in plasma. Platelets play one of major roles in the hemostatic ...
Platelets contain dense granules, lambda granules, and alpha granules. Activated platelets secrete the contents of these granules through their canalicular systems to the exterior. Bound and activated platelets degranulate to release platelet chemotactic agents to attract more platelets to the site of endothelial injury. Granule characteristics: