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Related Experiment Videos

Insulin exerts opposite effects on platelet function at physiological and supraphysiological concentrations

G Anfossi1, P Massucco, L Mattiello

  • 1Department of Clinical and Biological Sciences, University of Turin, San Luigi Gonzaga Hospital, Italy.

Thrombosis Research
|April 1, 1996
PubMed
Summary

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Insulin

Area of Science:

  • Biochemistry
  • Pharmacology
  • Platelet Biology

Background:

  • Insulin's role in metabolic regulation is well-established.
  • Its direct effects on platelet function and cyclic guanosine monophosphate (cGMP) signaling are less understood.
  • Platelets play a critical role in hemostasis and thrombosis.

Purpose of the Study:

  • To investigate the concentration-dependent effects of insulin on platelet aggregation and intraplatelet cGMP levels.
  • To elucidate the underlying mechanisms involving guanylate cyclase and phosphodiesterase activity.

Main Methods:

  • Platelet-rich plasma was incubated with varying concentrations of insulin (0.25-200 nmol/L) for 3 minutes.
  • Platelet aggregation induced by adenosine 5-diphosphate (ADP) was measured.

Related Experiment Videos

  • Intraplatelet cGMP levels were quantified.
  • Experiments were conducted with and without phosphodiesterase inhibition (theophylline, zaprinast).

    • Main Results:

    • Physiological insulin concentrations (0.25-2 nmol/L) reduced ADP-induced platelet aggregation and increased intraplatelet cGMP.
    • Supraphysiological insulin concentrations (25-200 nmol/L) increased aggregation and decreased cGMP.
    • Insulin modulated both cGMP synthesis (via guanylate cyclase) and degradation (via phosphodiesterase).
    • In the presence of phosphodiesterase inhibitors, insulin exhibited anti-aggregating effects even at high concentrations.

    Conclusions:

    • Insulin exerts dual, concentration-dependent effects on platelet function.
    • At physiological levels, insulin promotes anti-aggregation by increasing cGMP.
    • At supraphysiological levels, insulin can promote aggregation by decreasing cGMP, primarily through phosphodiesterase activation.