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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...
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...
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...
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...
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.
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...

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Related Experiment Video

Updated: Jul 14, 2026

Ferric Chloride-induced Murine Thrombosis Models
10:37

Ferric Chloride-induced Murine Thrombosis Models

Published on: September 5, 2016

Platelets in atherothrombosis: new and evolving roles.

Andy Weyrich1, Francesco Cipollone, Andrea Mezzetti

  • 1Eccles Institute of Human Genetics, Salt Lake City, Utah 84112, USA.

Current Pharmaceutical Design
|June 23, 2007
PubMed
Summary

Platelets interact with immune cells and blood vessel linings in health and disease. Understanding these interactions reveals new therapeutic targets for atherosclerosis and related cardiovascular conditions.

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Related Experiment Videos

Last Updated: Jul 14, 2026

Ferric Chloride-induced Murine Thrombosis Models
10:37

Ferric Chloride-induced Murine Thrombosis Models

Published on: September 5, 2016

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

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Area of Science:

  • Cardiovascular Biology
  • Immunology
  • Hematology

Background:

  • Platelet interactions with leukocytes and endothelial cells are vital for host defense, wound repair, and tissue healing.
  • These cellular interactions also play a critical role in thrombotic and inflammatory diseases, including atherosclerosis.
  • Understanding the molecular mechanisms of these interactions is key to developing new treatments.

Purpose of the Study:

  • To review newly recognized aspects of platelet interactions with monocytes, neutrophils, and endothelial cells.
  • To highlight the relevance of these interactions across all phases of atherosclerosis progression.
  • To identify potential pharmacological targets for intervention in cardiovascular diseases.

Main Methods:

  • Literature review of recent research on platelet-leukocyte-endothelial cell interactions.
  • Focus on molecular mechanisms and functional consequences.
  • Analysis of relevance to atherosclerosis pathogenesis and complications.

Main Results:

  • Newly identified molecular links governing platelet interactions with monocytes, neutrophils, and endothelial cells.
  • Demonstration of these interactions' involvement in early atherogenesis, plaque rupture, and thrombosis.
  • Highlighting the role of these interactions in acute coronary syndromes.

Conclusions:

  • Platelet interactions are central to the pathogenesis of atherosclerosis.
  • Targeting these cellular crosstalk mechanisms offers promising therapeutic strategies for cardiovascular diseases.
  • Further research into these molecular pathways can lead to novel pharmacological interventions.