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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

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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...
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Formation of the Platelet Plug01:22

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

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

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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...
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Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

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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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Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
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Related Experiment Video

Updated: May 23, 2025

Cell-free Biochemical Fluorometric Enzymatic Assay for High-throughput Measurement of Lipid Peroxidation in High Density Lipoprotein
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Regulation of Platelet Function by HDL.

Marion Pilard1,2, Sara Babran1,2, Catherine Martel1,2

  • 1Department of Medicine, Faculty of Medicine, Université de Montréal, Canada.

Arteriosclerosis, Thrombosis, and Vascular Biology
|April 10, 2025
PubMed
Summary
This summary is machine-generated.

High-density lipoprotein (HDL) cholesterol

Keywords:
atherothrombosisblood plateletshigh-density lipoproteinmegakaryocytes

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Area of Science:

  • Cardiovascular Science
  • Lipid Metabolism
  • Thrombosis Research

Background:

  • High-density lipoprotein (HDL) cholesterol's role in cardiovascular disease (CVD) treatment, particularly macrophage reverse cholesterol transport, has been extensively studied.
  • Recent clinical trials show limited efficacy of HDL or apolipoprotein A-I (APOA1) in preventing cardiovascular events.
  • Despite weak direct causality, HDL cholesterol's consistent inverse association with CVD risk suggests involvement in alternative pathways.

Purpose of the Study:

  • To review the interaction between HDL and platelets.
  • To explore HDL's potential role in modulating atherothrombotic responses.
  • To emphasize the influence of HDL components, particularly APOA1, on platelet function.

Main Methods:

  • Literature review focusing on HDL-platelet interactions.
  • Analysis of studies investigating HDL's effect on platelet activation and function.
  • Exploration of APOA1's specific interactions with platelets.

Main Results:

  • HDL and its components, especially APOA1, interact with platelets.
  • These interactions can modulate platelet function and atherothrombotic responses.
  • HDL may influence CVD risk through mechanisms beyond cholesterol transport, such as platelet modulation.

Conclusions:

  • HDL's impact on cardiovascular disease may be mediated by its effects on platelet function.
  • APOLIPOPROTEIN A-I (APOA1) is a key HDL component interacting with platelets.
  • Understanding HDL-platelet interactions offers new therapeutic avenues for cardiovascular diseases.