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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...
Disorders of Hemostasis01:24

Disorders of Hemostasis

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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Related Experiment Video

Updated: Jun 19, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells

Published on: December 27, 2017

Hypergravity results in human platelet hyperactivity.

S Li1, Q Shi, Z Wang

  • 1School of Biological Science and Medical Engineering, Beijing University of Aeronautics and Astronautics, Beijing, China.

Journal of Physiology and Biochemistry
|November 6, 2009
PubMed
Summary
This summary is machine-generated.

Hypergravity exposure increases human platelet hyperactivity, enhancing aggregation and adhesion. However, it does not trigger full platelet activation, suggesting a new mechanism for thrombosis under high gravity conditions.

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Last Updated: Jun 19, 2026

Megakaryocyte Differentiation and Platelet Formation from Human Cord Blood-derived CD34+ Cells
09:46

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Turbidimetry on Human Washed Platelets: The Effect of the Pannexin1-inhibitor Brilliant Blue FCF on Collagen-induced Aggregation
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Turbidimetry on Human Washed Platelets: The Effect of the Pannexin1-inhibitor Brilliant Blue FCF on Collagen-induced Aggregation

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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
04:37

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

Published on: May 23, 2025

Area of Science:

  • Biomedical Engineering
  • Hematology
  • Physiology

Background:

  • Thrombotic diseases can occur under hypergravity, but the underlying mechanisms remain unclear.
  • Platelets are crucial in thrombus formation and their response to hypergravity is not well understood.

Purpose of the Study:

  • To investigate the effects of hypergravity on human platelet function.
  • To explore the potential role of hypergravity in thrombotic disease mechanisms.

Main Methods:

  • Human platelet-rich plasma (PRP) and washed platelets were exposed to hypergravity (8 G) for 15 minutes.
  • Platelet aggregation was measured using ristocetin and collagen as agonists.
  • Platelet adhesion to fibrinogen and spreading on von Willebrand factor (VWF) were assessed.
  • Flow cytometry was used to analyze integrin alphaIIbbeta3 activation and P-selectin expression.

Main Results:

  • Hypergravity (8 G) alone did not induce platelet aggregation.
  • Ristocetin- and collagen-induced platelet aggregation were significantly enhanced under hypergravity.
  • Platelet adhesion to fibrinogen and spreading on VWF increased under hypergravity.
  • Partial activation of integrin alphaIIbbeta3 was observed, but P-selectin expression remained unchanged.

Conclusions:

  • Hypergravity induces human platelet hyperactivity, increasing aggregation and adhesion.
  • Hypergravity does not trigger essential platelet activation events like P-selectin expression.
  • This suggests a novel mechanism for thrombotic events occurring under hypergravitational conditions.