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Related Experiment Videos

Enhancing effect by heparin on shear-induced platelet aggregation.

K Kawano1, Y Ikeda, M Handa

  • 1Department of Hematology, School of Medicine, Keio University, Tokyo, Japan.

Seminars in Thrombosis and Hemostasis
|October 1, 1990
PubMed
Summary

We developed a new device to measure shear-induced platelet aggregation (SIPA). Unfractionated heparin enhances SIPA dose-dependently, with varying effects in bleeding disorders.

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Area of Science:

  • Hematology
  • Biomedical Engineering

Background:

  • Platelet aggregation is crucial for hemostasis.
  • Understanding factors influencing platelet aggregation is vital for thrombosis and bleeding disorder research.
  • Heparin is widely used as an anticoagulant, but its direct effects on platelet function require further elucidation.

Purpose of the Study:

  • To investigate the effects of heparin and heparinoids on shear-induced platelet aggregation (SIPA).
  • To characterize the influence of different heparin preparations (unfractionated vs. low molecular weight) on SIPA.
  • To examine heparin's effects on SIPA in platelet-rich plasma (PRP) from patients with congenital bleeding disorders.

Main Methods:

  • Development of a novel device for continuous SIPA measurement.
  • In vitro experiments using human PRP.

Related Experiment Videos

  • Testing the effects of unfractionated heparin, low molecular weight heparin, and heparinoids.
  • Analysis of SIPA in PRP from patients with Bernard-Soulier syndrome, type III von Willebrand's disease, afibrinogenemia, and Glanzmann's thrombasthenia under varying shear stresses.

    • Main Results:

    • Heparin significantly enhanced SIPA in a dose-dependent manner, even without agonists.
    • Heparinoids showed minimal effects on SIPA.
    • Unfractionated heparin had a greater enhancing effect on SIPA compared to low molecular weight heparin.
    • Heparin's effects on SIPA in patients with bleeding disorders were specific, observed under particular shear stress conditions and in certain disorders (Bernard-Soulier syndrome, type III von Willebrand's disease, afibrinogenemia).

    Conclusions:

    • Heparin directly enhances platelet aggregation induced by shear stress.
    • The degree of heparin's effect on SIPA varies with its molecular weight and is dependent on specific platelet function defects and shear conditions.
    • These findings provide novel insights into the complex mechanisms of heparin's interaction with platelets and its role in hemostasis and thrombosis.