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Related Concept Videos

Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

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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...
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Structure and Function of Platelets01:18

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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...
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Formation of the Platelet Plug01:22

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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...
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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
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Structure of Cadherins01:25

Structure of Cadherins

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The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins”   is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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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.
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Related Experiment Video

Updated: Feb 19, 2026

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

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Structural Analysis of von Willebrand Factor.

Maria A Brehm1

  • 1Institute of Biology, School of Science and Technology, University of Siegen, Siegen, Germany.

Hamostaseologie
|February 17, 2026
PubMed
Summary
This summary is machine-generated.

This review examines the structure of von Willebrand factor (VWF), a key protein in blood clotting. Understanding VWF

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Von Willebrand factor (VWF) is a large glycoprotein crucial for hemostasis.
  • Its modular structure enables functions like shear force sensing, platelet adhesion, and factor VIII stabilization.
  • Understanding VWF's structure is key to comprehending its role in physiological processes.

Purpose of the Study:

  • To review the molecular architecture of von Willebrand factor (VWF).
  • To explore the structural basis of VWF's interactions with other molecules.
  • To discuss how structural insights can advance disease understanding and therapeutic strategies for VWF-related disorders.

Main Methods:

  • X-ray crystallography
  • Cryo-electron microscopy (cryo-EM)
  • Nuclear magnetic resonance (NMR)
  • Molecular modeling

Main Results:

  • Detailed structural studies have elucidated the architecture of nearly all VWF domains.
  • Specific molecular properties of each domain contribute to VWF's overall function.
  • Structural insights reveal the mechanisms behind VWF's role in hemostasis.

Conclusions:

  • The modular structure of VWF underpins its diverse functions in hemostasis.
  • Structural knowledge is vital for understanding VWF-related diseases.
  • Advances in structural biology offer new avenues for therapeutic interventions.