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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.
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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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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: 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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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Related Experiment Video

Updated: May 6, 2026

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

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Apoptotic Events in Type-I Glanzmann Thrombasthenia Platelets.

Ehsan Shahverdi1, Corinna Petz1, Turadj Hemmati2

  • 1Department of Oncology, Hematology, and Stem Cell Transplantation, Hospital Osnabrück, Westphalian Wilhelms University of Münster, Osnabrück, Germany.

International Journal of Hematology-Oncology and Stem Cell Research
|May 5, 2026
PubMed
Summary
This summary is machine-generated.

Glanzmann thrombasthenia platelets show normal apoptosis despite GPIIbIIIa deficiency. This suggests GPIIb-IIIa-independent pathways regulate platelet apoptosis, potentially explaining normal platelet counts in patients.

Keywords:
ApoptosisFlow cytometryGlanzmann thrombastheniaGlycoprotein IIbIIIaMicroparticle

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Procoagulant Platelet Characterization by Measuring Phosphatidylserine Exposure and Microvesicle Release from Human Purified Platelets
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A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry
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A Uniform Shear Assay for Human Platelet and Cell Surface Receptors via Cone-plate Viscometry
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Area of Science:

  • Hematology
  • Cell Biology
  • Biochemistry

Background:

  • Platelet activation involves biochemical and morphological changes, including apoptosis.
  • Hallmarks of platelet apoptosis include phosphatidylserine (PS) exposure, mitochondrial depolarization, microparticle formation, and shrinkage.
  • This study investigates the apoptotic responses in type I Glanzmann thrombasthenic platelets.

Purpose of the Study:

  • To examine the apoptotic responses of type I Glanzmann thrombasthenic platelets.
  • To determine if GPIIbIIIa deficiency affects platelet activation and apoptosis.
  • To explore potential GPIIb-IIIa-independent mechanisms in thrombasthenic platelet apoptosis.

Main Methods:

  • Washed platelets from 12 type I Glanzmann thrombasthenia patients were analyzed.
  • Platelet activation was induced using calcium ionophore A23187.
  • Flow cytometry assessed PS exposure, mitochondrial membrane potential (Δψm) depolarization, microparticle (MP) formation, and platelet shrinkage.

Main Results:

  • Increased cytosolic calcium induced PS exposure, Δψm depolarization, MP formation, and platelet shrinkage in thrombasthenic platelets.
  • Type I Glanzmann thrombasthenic platelets exhibit characteristics of apoptosis.
  • GPIIbIIIa deficiency did not impede platelet activation or apoptosis.

Conclusions:

  • GPIIb-IIIa-independent mechanisms likely contribute to normal apoptosis in thrombasthenic platelets.
  • The findings deepen understanding of the platelet fibrinogen receptor's role in apoptosis.
  • This may explain the normal platelet counts observed in Glanzmann thrombasthenia patients.