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Related Concept Videos

Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

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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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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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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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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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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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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Related Experiment Video

Updated: Dec 24, 2025

Using a GFP-tagged TMEM184A Construct for Confirmation of Heparin Receptor Identity
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Heparanase in the Coagulation System.

Yona Nadir1

  • 1Thrombosis and Hemostasis Unit, Rambam Health Care Campus, The Bruce Rappaport Faculty of Medicine, Technion, Haifa, Israel. y_nadir@rambam.health.gov.il.

Advances in Experimental Medicine and Biology
|April 11, 2020
PubMed
Summary
This summary is machine-generated.

Heparanase protein enhances blood clotting by increasing tissue factor (TF) activity and expression. Inhibiting the TF/heparanase interaction offers a new therapeutic target for coagulation, cancer, and inflammation.

Keywords:
CancerCoagulationHeparanasePregnancyTFPI-2 peptides

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Area of Science:

  • Biochemistry
  • Hematology
  • Oncology

Background:

  • The coagulation cascade initiates fibrin formation, crucial for hemostasis.
  • Tissue factor (TF) is the primary initiator of the extrinsic coagulation pathway.
  • Heparanase protein is implicated in modulating TF activity and expression.

Purpose of the Study:

  • To investigate the role of heparanase in enhancing TF activity and coagulation.
  • To explore heparanase's mechanisms in hemostatic system activation.
  • To evaluate the therapeutic potential of inhibiting the TF/heparanase complex.

Main Methods:

  • Assessing heparanase's direct effect on TF activity.
  • Analyzing heparanase-induced changes in TF expression in endothelial cells.
  • Measuring TFPI release from cell surfaces.
  • Evaluating TFPI-2 derived peptides for inhibitory effects on the TF/heparanase complex.
  • Observing heparanase procoagulant activity in various clinical cohorts.

Main Results:

  • Heparanase directly enhances TF activity, promoting coagulation.
  • Heparanase up-regulates TF expression and releases TFPI, further activating hemostasis.
  • TFPI-2 derived peptides inhibit the TF/heparanase complex, reducing sepsis and tumor growth.
  • Elevated heparanase activity is present in diverse clinical conditions, with distinct profiles.

Conclusions:

  • Heparanase plays a significant role in promoting coagulation through multiple mechanisms involving TF.
  • Inhibition of the TF/heparanase interaction presents a novel therapeutic strategy.
  • Targeting TF/heparanase may offer benefits in treating coagulation disorders, cancer, and inflammatory conditions.