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Related Concept Videos

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Extrinsic and Intrinsic Pathways of Hemostasis01:20

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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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Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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Regulation of Angiogenesis and Blood Supply01:24

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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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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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Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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...
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Related Experiment Video

Updated: Mar 20, 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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Von Willebrand factor regulates complement on endothelial cells.

Damien G Noone1, Magdalena Riedl2, Fred G Pluthero3

  • 1Division of Nephrology, The Hospital for Sick Children, Toronto, Ontario, Canada; Department of Paediatrics, University of Toronto, Toronto, Ontario, Canada; Cell Biology Program, Research Institute, The Hospital for Sick Children, Toronto, Ontario, Canada.

Kidney International
|May 30, 2016
PubMed
Summary
This summary is machine-generated.

Von Willebrand factor (VWF) protects endothelial cells from complement-mediated injury. This study reveals a functional link between VWF-multimers and the complement system, identifying VWF as a novel complement regulator.

Keywords:
atypical hemolytic uremic syndromeblood outgrowth endothelial cellscomplementthrombotic microangiopathythrombotic thrombocytopenic purpuravon Willebrand factor

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Area of Science:

  • Vascular Biology
  • Complement System
  • Hemostasis

Background:

  • Atypical hemolytic uremic syndrome and thrombotic thrombocytopenic purpura were considered distinct diseases.
  • Defects in complement regulation characterize atypical hemolytic uremic syndrome, while von Willebrand factor (VWF) multimer cleavage issues define thrombotic thrombocytopenic purpura.
  • Emerging evidence suggests overlap and functional interactions between these disease pathways.

Purpose of the Study:

  • To investigate the functional relationship between VWF-multimers and the complement system on endothelial cells.
  • To determine if VWF influences complement-mediated endothelial cell injury.

Main Methods:

  • Blood outgrowth endothelial cells (BOECs) were isolated from healthy donors and patients with Type 3 von Willebrand disease (lacking VWF).
  • Cells were subjected to a complement challenge using normal human serum activating both classical and alternative pathways.
  • VWF-multimer release, platelet adhesion, complement C3c deposition, and cytotoxicity were assessed.

Main Results:

  • Healthy BOECs released VWF-multimers, promoting platelet adhesion under complement challenge.
  • BOECs from von Willebrand disease patients exhibited increased C3c deposition and cytotoxicity compared to healthy BOECs.
  • Primary glomerular endothelial cells show heterogeneous VWF expression with reduced abundance.

Conclusions:

  • A mechanistic link exists between VWF-multimers and the complement system on endothelial cells.
  • VWF acts as a novel regulator of the complement system on vascular endothelial cells.
  • VWF demonstrates a protective role against complement-mediated endothelial cell injury.