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Related Concept Videos

Overview of Exosomes01:36

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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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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.
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Structure and Function of Platelets01:18

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

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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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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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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.
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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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Platelet-Derived Exosomes and Atherothrombosis.

Kangkang Wei1,2,3, Hongbo Huang1,4, Min Liu1,4

  • 1National Clinical Research Center for Chinese Medicine Cardiology, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China.

Frontiers in Cardiovascular Medicine
|May 2, 2022
PubMed
Summary

Platelet-derived exosomes (PLT-Exos) are key in cell communication and linked to atherothrombosis. Their dual role, either antithrombotic or pro-atherothrombotic, depends on the donor, highlighting their diagnostic potential for cardiovascular disease.

Keywords:
atherothrombosisexosomesintercellular communicationplaqueplateletthrombus

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Area of Science:

  • Cardiovascular Biology
  • Extracellular Vesicles Research
  • Thrombosis and Hemostasis

Background:

  • Platelet-derived exosomes (PLT-Exos) are extracellular vesicles crucial for intercellular communication.
  • PLT-Exos are released upon platelet activation and implicated in atherothrombosis.
  • Atherosclerotic plaque rupture leading to cardiovascular events is a major health concern.

Purpose of the Study:

  • To review the characteristics of PLT-Exos.
  • To discuss the role of PLT-Exos in cell-to-cell communication.
  • To explore the involvement of PLT-Exos in atherothrombosis.

Main Methods:

  • Literature review on PLT-Exos characteristics and functions.
  • Analysis of studies investigating PLT-Exos in platelet activation and endothelial cell responses.
  • Examination of PLT-Exos as potential biomarkers for cardiovascular disease.

Main Results:

  • PLT-Exos mediate intercellular communication by transferring cargo to acceptor cells.
  • PLT-Exos exhibit dual roles: inhibiting platelet activation and endothelial inflammation (antithrombotic) or promoting endothelial apoptosis and inflammation (pro-atherothrombotic).
  • Increased PLT-Exos levels correlate with platelet activation and can serve as biomarkers for cardiovascular disease diagnosis and prognosis.

Conclusions:

  • PLT-Exos are significant mediators in atherothrombosis, with functions varying based on their origin.
  • Understanding PLT-Exos' dual roles is critical for developing therapeutic strategies against cardiovascular disease.
  • PLT-Exos hold promise as diagnostic and prognostic biomarkers for cardiovascular conditions.