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Related Concept Videos

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...
General Transcription Factors01:30

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Factors02:16

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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.
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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...
Coagulation01:09

Coagulation

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.
During the coagulation phase, clotting factors, or procoagulants, play a vital role in initiating and progressing the coagulation cascade. This cascade is a series of reactions...

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Related Experiment Video

Updated: Jun 21, 2026

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

The many faces of tissue factor.

N Mackman1

  • 1Division of Hematology and Oncology, Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA. nmackman@med.unc.edu

Journal of Thrombosis and Haemostasis : JTH
|July 28, 2009
PubMed
Summary
This summary is machine-generated.

Tissue factor (TF) is crucial for blood clotting but also drives thrombosis, inflammation, and tumor growth. Understanding TF

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Published on: February 14, 2017

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunology

Background:

  • Tissue factor (TF) is a cytokine receptor superfamily member that binds FVII/VIIa.
  • The TF:FVIIa complex exhibits both procoagulant and signaling functions.
  • TF plays a role in hemostasis, thrombosis, inflammation, angiogenesis, and tumor growth.

Purpose of the Study:

  • To elucidate the multifaceted roles of Tissue Factor (TF) in biological processes.
  • To explore TF's involvement in hemostasis, thrombosis, inflammation, and cancer.

Main Methods:

  • Analysis of TF's interactions with FVII/VIIa.
  • Investigation of TF's procoagulant and signaling activities.
  • Examination of TF's role in various physiological and pathological conditions.

Main Results:

  • TF is essential for hemostasis.
  • Increased TF expression and TF-positive microparticles promote thrombosis in atherosclerosis.
  • TF exacerbates inflammation via fibrin deposition, pro-inflammatory fragment generation, and protease activation of PARs.
  • TF contributes to tumor growth by activating PAR2.

Conclusions:

  • The TF:FVIIa complex is a key regulator of hemostasis and thrombosis.
  • TF significantly contributes to inflammatory responses and disease pathogenesis.
  • Targeting TF may offer therapeutic strategies for thrombotic and inflammatory diseases, and cancer.