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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...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors

Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...
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...
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.

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Related Experiment Video

Updated: Jun 15, 2026

Analyzing Platelet Subpopulations by Multi-color Flow Cytometry
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Analyzing Platelet Subpopulations by Multi-color Flow Cytometry

Published on: June 10, 2025

Effects of glucosamine and Celadrin on platelet function.

Pei-Chun Lin1, Samuel O Jones, David L McGlasson

  • 1Wilford Hall Medical Center, Cardiology Department, 2200 Bergquist Drive, Ste 1, Lackland AFB, TX 78236, USA. pei-chun.lin@lackland.af.mil

Clinical Laboratory Science : Journal of the American Society for Medical Technology
|March 12, 2010
PubMed
Summary

Glucosamine and celadrin may inhibit platelet aggregation in some individuals. This study found potential aspirin-like effects and inhibition of ADP receptor P2Y1, but not P2Y12.

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Area of Science:

  • Pharmacology
  • Hematology

Background:

  • Platelet aggregation plays a crucial role in thrombosis.
  • Understanding modulators of platelet function is vital for cardiovascular health.
  • Glucosamine and celadrin are supplements with potential anti-inflammatory properties.

Purpose of the Study:

  • To investigate the impact of glucosamine and celadrin supplementation on platelet function.
  • To assess the effects on adenosine diphosphate (ADP)-induced and collagen-induced platelet aggregation.
  • To evaluate the influence on arachidonic acid pathway and P2Y12 receptor activity.

Main Methods:

  • Whole blood platelet aggregation was measured using impedance aggregometry.
  • Stimuli included adenosine diphosphate (ADP), collagen, and arachidonic acid.
  • An Accumetrics assay assessed P2Y12 receptor function before and after 2 weeks of supplementation.

Main Results:

  • A significant difference in platelet aggregation was observed in some subjects with ADP, collagen, and arachidonic acid.
  • No significant differences were detected in P2Y12 receptor function.
  • Individual variability in response to glucosamine and celadrin was noted.

Conclusions:

  • Glucosamine and celadrin may possess inhibitory effects on platelet aggregation in certain individuals.
  • The mechanism may involve aspirin-like effects and inhibition of the P2Y1 receptor.
  • Further research is warranted to elucidate the precise mechanisms and clinical implications.