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Related Experiment Videos

Platelet ultrastructure and secretion in acute ischemic stroke.

R Joseph1, J M Riddle, K M Welch

  • 1Department of Neurology, Henry Ford Hospital, Detroit, Michigan.

Stroke
|October 1, 1989
PubMed
Summary

Platelets from acute ischemic stroke patients have fewer alpha granules and mitochondria compared to healthy individuals. This suggests increased platelet activity may contribute to stroke development.

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Area of Science:

  • Hematology
  • Neurology
  • Cell Biology

Background:

  • Platelets play a crucial role in hemostasis and thrombosis.
  • Altered platelet function is implicated in the pathogenesis of ischemic stroke.
  • Specific organelle content changes in platelets during acute ischemic stroke are not fully understood.

Purpose of the Study:

  • To investigate the ultrastructural differences in platelet organelles between patients with acute ischemic stroke and healthy controls.
  • To explore the relationship between platelet organelle content and platelet secretory function.

Main Methods:

  • Transmission electron microscopy was employed to quantify dense bodies, alpha granules, and mitochondria in platelet profiles.
  • Platelets were analyzed from 11 acute ischemic stroke patients and 12 healthy controls.

Related Experiment Videos

  • 25 platelet profiles per patient were randomly selected from ultrathin sections.

    • Main Results:

    • Platelets from acute ischemic stroke patients exhibited significantly fewer alpha granules (p < 0.001) and mitochondria (p < 0.02) compared to controls.
    • A trend towards fewer dense bodies was observed in platelets from stroke patients.
    • Adenosine triphosphate secretion upon collagen stimulation tended to be greater in platelets from stroke patients.

    Conclusions:

    • Acute ischemic stroke is associated with a reduction in key platelet organelles, specifically alpha granules and mitochondria.
    • These findings support the hypothesis of increased platelet secretory activity in acute cerebral infarction.
    • Altered platelet organelle content and enhanced secretion may contribute to the mechanical occlusion of blood vessels in stroke pathogenesis.