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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...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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...
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.
Structure and Function of Platelets01:18

Structure and Function of Platelets

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 platelets, with...
Introduction to Hemostasis01:05

Introduction to Hemostasis

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.
The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
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...

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Related Experiment Video

Updated: Jul 2, 2026

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
10:08

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets

Published on: November 22, 2024

Internalization of tissue factor by platelets.

Gines Escolar1, Irene Lopez-Vilchez, Maribel Diaz-Ricart

  • 1Servicio de Hemoterapia y Hemostasia, Hospital Clinic, Centre de Diagnostic Biomedic, IDIBAPS, Universidad de Barcelona, Spain. gescolar@clinic.ub.es

Thrombosis Research
|August 12, 2008
PubMed
Summary
This summary is machine-generated.

Platelets internalize tissue factor (TF) carried on microvesicles (MVs) via endocytosis. This TF uptake by platelets may contribute to thrombus formation and ischemic complications.

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Extracellular Vesicle Tissue Factor Activity Assay
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Extracellular Vesicle Tissue Factor Activity Assay

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Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time
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Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Tissue factor (TF) is linked to platelets, but mechanisms of interaction and transport remain unclear.
  • Understanding TF-platelet interactions is crucial for studying thrombosis and related conditions.

Purpose of the Study:

  • To investigate how platelets interact with and internalize tissue factor (TF) exposed on lipid microvesicles (MVs).
  • To elucidate the cellular mechanisms and kinetics of TF-MV uptake by platelets.

Main Methods:

  • Utilized sequential ultrastructural and immunocytochemical studies.
  • Examined the response of isolated washed platelets to recombinant (rTF) and placental (pTF) human TF on MVs.
  • Monitored platelet activation and tyrosine phosphorylation patterns.

Main Results:

  • Platelets endocytosed TF-MVs into their open canalicular system (OCS) and cytoplasm within 30 minutes.
  • Internalization was faster for placental TF (pTF) than recombinant TF (rTF), potentially due to contaminating antigens.
  • Observed transient platelet activation and changes in tyrosine phosphorylation during TF-MV uptake.

Conclusions:

  • Platelets possess mechanisms to capture and internalize TF-rich vesicles.
  • TF carried by platelets may play a role in platelet thrombus formation and ischemic complications.
  • Contaminating antigens on TF-MVs can accelerate platelet uptake.