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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

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Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
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Updated: Jul 19, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Factor VIII is a positive regulator of platelet function.

A Obergfell1, A Sturm, C P Speer

  • 1Institute of Clinical Biochemistry and Pathobiochemistry, Central Laboratory, Wuerzburg, Germany. a.obergfell@medizin.uni-wuerzburg.de

Platelets
|November 1, 2006
PubMed
Summary

Factor VIII (FVIII) enhances platelet activation when co-stimulated with TRAP-6. This finding suggests FVIII may contribute to thrombus formation in individuals with elevated FVIII levels.

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Last Updated: Jul 19, 2026

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Investigating von Willebrand Factor Pathophysiology Using a Flow Chamber Model of von Willebrand Factor-platelet String Formation

Published on: August 14, 2017

Area of Science:

  • Hematology
  • Hemostasis and Thrombosis
  • Platelet Biology

Background:

  • Factor VIII (FVIII) is crucial for hemostasis but elevated levels are linked to thromboembolism.
  • Platelets, normally non-reactive with FVIII, can bind it upon activation without von Willebrand factor (vWF).
  • The direct impact of FVIII on platelet function remains unclear.

Purpose of the Study:

  • To investigate the direct influence of platelet-bound FVIII on platelet function.
  • To determine if FVIII modulates platelet activation markers and aggregation.

Main Methods:

  • Flow cytometry analyzed P-selectin (CD62P) expression and PAC-1 binding.
  • Confocal microscopy assessed platelet spreading on fibrinogen.
  • Platelet aggregometry measured aggregation responses.
  • Platelets were treated with FVIII alone or co-stimulated with TRAP-6.

Main Results:

  • FVIII alone did not alter P-selectin expression or PAC-1 binding.
  • TRAP-6 stimulation significantly increased P-selectin and PAC-1 binding.
  • Co-stimulation with FVIII and TRAP-6 further enhanced PAC-1 binding (P < 0.05) and platelet spreading (P < 0.05).
  • Platelet aggregation was also enhanced with FVIII and TRAP-6 co-stimulation.

Conclusions:

  • Factor VIII acts as a positive regulator of platelet function in TRAP-6 co-stimulated platelets.
  • Increased platelet activation by FVIII may contribute to venous and arterial thrombus formation in individuals with high FVIII levels.