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Related Concept Videos

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...
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...
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...
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.
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...
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.
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Related Experiment Video

Updated: Jul 16, 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

Human platelets synthesize and express functional tissue factor.

Olga Panes1, Valeria Matus, Claudia G Sáez

  • 1Department of Hematology-Oncology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.

Blood
|March 10, 2007
PubMed
Summary

Human platelets synthesize their own tissue factor (TF) protein, crucial for blood clotting. This discovery clarifies the cell-based model of hemostasis, explaining TF

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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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A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

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Last Updated: Jul 16, 2026

Flow Cytometry Analysis of Tissue Factor Expression in Human Platelets
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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
09:38

A Microfluidic Flow Chamber Model for Platelet Transfusion and Hemostasis Measures Platelet Deposition and Fibrin Formation in Real-time

Published on: February 14, 2017

Extracellular Vesicle Tissue Factor Activity Assay
03:53

Extracellular Vesicle Tissue Factor Activity Assay

Published on: December 29, 2023

Area of Science:

  • Hematology
  • Molecular Biology
  • Biochemistry

Background:

  • The origin and role of bloodborne tissue factor (TF) in coagulation remain debated.
  • Previous studies detected TF mRNA, protein, and activity in platelets, but lacked direct evidence of TF synthesis.

Purpose of the Study:

  • To investigate whether human platelets synthesize their own tissue factor (TF).
  • To elucidate the role of platelet-derived TF in thrombin generation and hemostasis.

Main Methods:

  • Detection of TF mRNA and protein in platelets using RT-PCR and immunoprecipitation.
  • Assessment of TF translocation to the plasma membrane via immunofluorescence and biotinylation.
  • Measurement of platelet procoagulant activity (PCA) and inhibition studies.
  • In vitro synthesis studies using [(35)S]-methionine incorporation and puromycin/actinomycin D treatment.

Main Results:

  • Platelets express TF mRNA and synthesize TF protein, with increased expression and membrane translocation upon activation.
  • Platelet activation induces PCA, significantly inhibited by anti-TF and anti-FVIIa antibodies.
  • Platelets incorporate radiolabeled methionine into TF proteins, indicating de novo synthesis, which is sensitive to puromycin but not transcription inhibitors.

Conclusions:

  • Human platelets synthesize their own tissue factor (TF), contributing to localized thrombin generation.
  • This finding provides direct evidence for platelet TF synthesis, unifying the understanding of the cell-based hemostasis model.
  • Platelet TF synthesis represents a timely and spatially regulated mechanism in hemostasis.