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Related Concept Videos

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.
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Related Experiment Video

Updated: Jun 23, 2026

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Effects of microgravity and hypergravity on platelet functions.

Kesheng Dai1, Yuedan Wang, Rong Yan

  • 1Department of Biological Science and Technology, Beijing University of Aeronautics and Astronautics, 37 Xueyuan Road, Haidian district, Beijing 100083, China. kdai@buaa.edu.cn

Thrombosis and Haemostasis
|May 1, 2009
PubMed
Summary
This summary is machine-generated.

Platelet functions are altered by gravity changes. Microgravity inhibits platelet aggregation and adhesion, while hypergravity enhances them, impacting bleeding and clotting risks.

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Last Updated: Jun 23, 2026

Microfluidics in Assessing Platelet Function
06:47

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

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

Area of Science:

  • Cardiovascular Biology
  • Hematology
  • Space Medicine

Background:

  • Human exposure to microgravity and hypergravity is linked to thrombotic and hemorrhagic diseases.
  • The role of platelets in gravity-related diseases remains unclear.
  • Platelets are critical for thrombosis and hemostasis.

Purpose of the Study:

  • To investigate the impact of microgravity and hypergravity on platelet function.
  • To explore the underlying mechanisms of gravity change-related vascular diseases.

Main Methods:

  • Simulated microgravity and hypergravity exposure of human platelets.
  • In vivo tail bleeding time in mice under different gravity conditions.
  • Analysis of glycoprotein (GP) Ibalpha expression and cytoskeletal association.

Main Results:

  • Platelet aggregation and adhesion to von Willebrand factor (VWF) decreased in simulated microgravity.
  • Platelet functions increased under hypergravity conditions.
  • Mice exposed to -8 Gx stress showed disseminated platelet thrombi and fatalities; bleeding time was altered in unloaded mice.

Conclusions:

  • Platelet function is inhibited in microgravity and activated in hypergravity.
  • Altered platelet function represents a novel mechanism for gravity change-related vascular diseases.
  • Findings have implications for preventing and treating these conditions and for human activities in varying gravity.