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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

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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.
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Structure of Cadherins01:25

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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

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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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Video Experimental Relacionado

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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Análisis estructural del factor von Willebrand

Maria A Brehm1

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

Hamostaseologie
|February 17, 2026
PubMed
Resumen

Esta revisión examina la estructura del factor von Willebrand (VWF), una proteína clave en la coagulación sanguínea. La comprensión del VWF

Palabras clave:
factor von Willebrandcoagulación sanguíneaestructura de proteínasinteracciones molecularesenfermedades relacionadas con VWF

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Área de la Ciencia:

  • Bioquímica
  • Biología molecular
  • Biología estructural

Sus antecedentes:

  • El factor von Willebrand (VWF) es una glicoproteína grande crucial para la hemostasia.
  • Su estructura modular permite funciones como la detección de fuerzas de cizallamiento, la adhesión plaquetaria y la estabilización del factor VIII.
  • Comprender la estructura del VWF es clave para comprender su papel en los procesos fisiológicos.

Objetivo del estudio:

  • Revisar la arquitectura molecular del factor von Willebrand (VWF).
  • Explorar la base estructural de las interacciones del VWF con otras moléculas.
  • Discutir cómo las perspectivas estructurales pueden avanzar en la comprensión de enfermedades y las estrategias terapéuticas para los trastornos relacionados con el VWF.

Principales métodos:

  • Cristalografía de rayos X
  • Criomicroscopía electrónica (cryo-EM)
  • Resonancia magnética nuclear (RMN)
  • Modelado molecular

Principales resultados:

  • Estudios estructurales detallados han dilucidado la arquitectura de casi todos los dominios del VWF.
  • Las propiedades moleculares específicas de cada dominio contribuyen a la función general del VWF.
  • Las perspectivas estructurales revelan los mecanismos detrás del papel del VWF en la hemostasia.

Conclusiones:

  • La estructura modular del VWF sustenta sus diversas funciones en la hemostasia.
  • El conocimiento estructural es vital para comprender las enfermedades relacionadas con el VWF.
  • Los avances en biología estructural ofrecen nuevas vías para las intervenciones terapéuticas.