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Related Concept Videos

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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Coagulation01:09

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The coagulation phase is a critical part of the body's process to prevent blood loss following injury to blood vessels. It involves chemical reactions that form a clot to seal the injured area. The clotting process begins shortly after injury, within 15-20 seconds for severe damage and 1-2 minutes for minor injuries.
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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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Introduction to Hemostasis01:05

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Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
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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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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.
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Updated: Jun 13, 2025

Author Spotlight: Deciphering Coagulation Disorders in Traumatic Brain Injury Patients
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Viral coagulation: pushing the envelope.

Edward Louis George Pryzdial1, John Ruggles Perrier1, Mahamud-Ur Rashid1

  • 1Centre for Blood Research, Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, British Columbia, Canada; Division of Medical Affairs and Innovation, Canadian Blood Services, Ottawa, Ontario, Canada.

Journal of Thrombosis and Haemostasis : JTH
|September 11, 2024
PubMed
Summary
This summary is machine-generated.

Viruses can hijack tissue factor (TF) on their envelopes to trigger blood clotting and inflammation, impacting immune responses and viral clearance. This interaction can lead to thrombosis or hemorrhage, influencing disease severity.

Keywords:
coagulationhemorrhageinflammationthrombosisvirus

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Area of Science:

  • Virology
  • Hematology
  • Immunology

Background:

  • Viruses interact with the blood clotting system, causing pathologies from thrombosis to hemorrhage.
  • Viral envelopes, particularly those from blood-borne viruses, can carry host-derived proteins like tissue factor (TF).

Purpose of the Study:

  • To overview the complex interactions between viral components, coagulation proteins, and blood cells.
  • To elucidate the role of tissue factor (TF) in virus-induced thromboinflammation.

Main Methods:

  • Review of existing literature on virus-host interactions and coagulation pathways.
  • Analysis of the mechanisms by which viral TF influences cellular activation and thromboinflammation.

Main Results:

  • Viral TF can bypass normal regulatory pathways, activating platelets, leukocytes, and endothelial cells.
  • This activation leads to a thromboinflammatory environment characterized by cytokine release and cellular aggregation.
  • TF-mediated thromboinflammation contributes to both innate and adaptive immunity for viral clearance.

Conclusions:

  • Tissue factor on viral envelopes is a critical mediator of virus-induced thromboinflammation.
  • This process influences the immune response to viral infections, potentially aiding viral clearance.
  • Understanding this axis is crucial for developing therapeutic strategies against viral diseases.