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Epinephrine-induced platelet aggregation. A twin study.

B Gaxiola, W Friedl, P Propping

    Clinical Genetics
    |December 1, 1984
    PubMed
    Summary
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    Genetic factors significantly influence epinephrine-induced platelet aggregation in healthy males. However, the effect of phentolamine and alpha-adrenergic receptor numbers are not genetically controlled, suggesting complex regulation of this response.

    Area of Science:

    • Cardiovascular Research
    • Genetics
    • Hematology

    Background:

    • Platelet aggregation is crucial for hemostasis and thrombosis.
    • Epinephrine is a key agonist stimulating platelet aggregation.
    • Understanding the genetic basis of platelet response to agonists is important for cardiovascular health.

    Purpose of the Study:

    • To investigate the heritability of epinephrine-induced platelet aggregation.
    • To determine if genetic factors influence the response to phentolamine, an alpha-adrenergic antagonist.
    • To explore the relationship between alpha-adrenergic receptor density and platelet aggregation response.

    Main Methods:

    • Study conducted on healthy adult male twin pairs (monozygotic and dizygotic).
    • Platelet aggregation induced by epinephrine was measured.

    Related Experiment Videos

  • Effect of phentolamine on platelet aggregation was assessed.
  • Alpha-adrenergic receptor number quantified using 3H-yohimbine binding.

    • Main Results:

    • Intraclass correlations indicated significant genetic influence on epinephrine-induced platelet aggregation.
    • The antagonizing effect of phentolamine was not found to be under genetic control.
    • No significant correlation was observed between epinephrine concentration for half-maximal aggregation and alpha-adrenergic receptor number.
    • A subset of individuals showed an inability to achieve complete platelet aggregation with epinephrine, independent of receptor numbers.

    Conclusions:

    • Platelet aggregation response to epinephrine is substantially influenced by genetic factors.
    • Genetic control over the alpha-adrenergic receptor system's modulation by phentolamine is limited.
    • The number of alpha-adrenergic receptors does not solely determine the extent of epinephrine-induced platelet aggregation.