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Related Experiment Videos

Platelet activation in Alzheimer disease

S Sevush1, W Jy, L L Horstman

  • 1Department of Psychiatry, University of Miami School of Medicine, Fla 33136, USA.

Archives of Neurology
|April 30, 1998
PubMed
Summary

Platelets in Alzheimer disease (AD) patients show increased activation, evidenced by more aggregates and complexes. This heightened platelet activity may play a role in AD pathogenesis.

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Area of Science:

  • Neuroscience
  • Hematology
  • Biochemistry

Background:

  • Recent studies indicate altered platelet serotonin levels in Alzheimer disease (AD).
  • This suggests a potential for increased platelet activation in AD patients.

Purpose of the Study:

  • To compare baseline activation of unstimulated platelets in patients with probable AD versus age-matched controls.

Main Methods:

  • Flow cytometry assessed platelet activation markers in 91 AD patients and 40 controls.
  • Key markers included circulating platelet aggregates, CD62p expression, leukocyte-platelet complexes, and platelet microparticles.
  • Analyses controlled for demographic, clinical, and physiological factors.

Main Results:

  • AD patients exhibited significantly higher platelet aggregates (39.5% increase), CD62p expression (59.3% increase), and leukocyte-platelet complexes (53.3% increase).

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  • No significant differences were found in platelet microparticles, platelet count, fibrinogen, or platelet factor 3.
  • Platelet activation was independent of disease severity, duration, age, or comorbidities.

    • Conclusions:

    • Platelets from AD patients demonstrate heightened unstimulated activation compared to controls.
    • Potential triggers include damaged cerebral endothelial cells or platelet membrane abnormalities.
    • Given platelets' role in amyloid precursor protein production, AD platelet activation may influence disease pathogenesis.