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Related Concept Videos

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...
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...
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...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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: Jun 8, 2026

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
11:18

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

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Platelet-Collagen Interactions in Hemostatic Mechanisms.

Ruoying Shen1, Ru Xu2, Huan Lei1,3,4

  • 1Shaanxi Key Laboratory of Biomaterials and Synthetic Biology and Shaanxi R&D Center of Biomaterials and Fermentation Engineering, School of Chemical Engineering, Northwest University, Xi'an, China.

Advanced Healthcare Materials
|June 7, 2026
PubMed
Summary

Collagen binding to platelet receptors initiates blood clotting. This review details collagen receptor interactions, their role in thrombus formation, and potential therapeutic targets for antithrombotic therapies.

Keywords:
GPVIcollagenhemostasisintegrinsvWF

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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

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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
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Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Related Experiment Videos

Last Updated: Jun 8, 2026

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
11:18

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

Published on: April 2, 2013

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

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow
11:42

Live-cell Imaging of Platelet Degranulation and Secretion Under Flow

Published on: July 10, 2017

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Collagen exposure post-endothelial damage signals platelet adhesion and activation, crucial for thrombin generation and fibrin formation.
  • Collagen, the extracellular matrix's main component, provides the surface for initiating blood clotting.
  • Platelet receptors like glycoprotein VI (GPVI), glycoprotein Ib-IX-V, and integrins (α2β1, αIIbβ3) interact with collagen, mediated by von Willebrand factor (vWF), to maintain hemostasis.

Purpose of the Study:

  • To systematically review the binding mechanisms, signaling pathways, and functional roles of GPVI, vWF, and integrins in thrombus formation.
  • To examine the role of various collagen types (IV, VI, XV, XVIII) in vascular integrity and hemostasis.
  • To identify current research limitations and future directions for validating collagen receptor interactions and developing antithrombotic therapies.

Main Methods:

  • Systematic literature review focusing on collagen-platelet receptor interactions.
  • Analysis of signaling pathways involved in thrombus formation.
  • Examination of the roles of different collagen types in hemostasis.

Main Results:

  • Detailed examination of binding mechanisms and signaling pathways of key collagen receptors (GPVI, vWF, integrins).
  • Exploration of the contribution of diverse collagen types to vascular integrity and hemostasis.
  • Identification of complexities in collagen-mediated platelet activation and thrombus development.

Conclusions:

  • Collagen receptor interactions are central to hemostasis and thrombus formation.
  • Further experimental validation of these interactions is needed.
  • Targeting these pathways offers potential for novel antithrombotic strategies.