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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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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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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Disorders of Hemostasis01:24

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Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.
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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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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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Related Experiment Video

Updated: Dec 10, 2025

Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice
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Real-time Imaging of Heterotypic Platelet-neutrophil Interactions on the Activated Endothelium During Vascular Inflammation and Thrombus Formation in Live Mice

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Crosstalk Between Platelets and Microbial Pathogens.

Conglei Li1,2, June Li2,3,4,5, Heyu Ni2,3,4,5,6,7

  • 1Department of Immunology, University of Toronto, Toronto, ON, Canada.

Frontiers in Immunology
|August 28, 2020
PubMed
Summary
This summary is machine-generated.

Platelets play a dual role in infections, fighting pathogens and being affected by them. Understanding these interactions is key to managing infectious and immune-mediated diseases.

Keywords:
COVID-19host immune responsesmicrobial pathogensplateletsthrombosis

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Area of Science:

  • Immunology
  • Hematology
  • Microbiology

Background:

  • Platelets are small blood cells crucial for hemostasis and thrombosis.
  • Platelets possess both pro- and anti-inflammatory properties, contributing to immune regulation.
  • Platelets are involved in recognizing and responding to microbial pathogens.

Purpose of the Study:

  • To review the bidirectional interactions between platelets and microbial pathogens.
  • To explore the implications of these interactions in infectious and immune-mediated diseases.
  • To highlight the relevance for understanding emerging infectious diseases like COVID-19.

Main Methods:

  • Literature review of studies on platelet-microbe interactions.
  • Analysis of mechanisms of platelet involvement in host defense and pathogen evasion.
  • Examination of platelet count and function alterations during infections.

Main Results:

  • Platelets directly interact with microbes to limit infection or modulate host immunity.
  • Microbial pathogens can alter platelet count and function, impacting disease pathogenesis.
  • These interactions are relevant in immune thrombocytopenia and alloimmune thrombocytopenia.

Conclusions:

  • Bidirectional interactions between platelets and microbes are significant in infectious disease pathogenesis.
  • Understanding these interactions can inform strategies for managing infectious and immune-mediated conditions.
  • Insights from well-studied microbes can aid in understanding emerging pathogens like SARS-CoV-2.