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Related Experiment Videos

Transient decrease of binding of insulin to platelets in acute ischemic heart disease

N N Kahn1, W A Bauman, A K Sinha

  • 1Department of Medicine, Mount Sinai Medical Center, New York, New York.

The American Journal of the Medical Sciences
|January 1, 1994
PubMed
Summary
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Platelets from patients with acute myocardial infarction show significantly fewer insulin binding sites. This decrease reverses during recovery, suggesting a link to prostaglandin E1 sensitivity.

Area of Science:

  • Cardiology
  • Endocrinology
  • Platelet Physiology

Background:

  • Acute myocardial infarction (AMI) and unstable angina pectoris (UAP) are critical cardiovascular conditions.
  • Insulin plays a role in cardiovascular health, and its binding to platelets may be affected during ischemic events.

Purpose of the Study:

  • To investigate the changes in specific insulin binding sites on platelets during acute ischemic conditions in non-diabetic patients.
  • To explore the relationship between insulin binding, plasma insulin/glucose levels, and platelet sensitivity to prostaglandin E1 during recovery.

Main Methods:

  • Quantification of specific 125I-insulin binding sites on platelets from patients with AMI/UAP and healthy controls.
  • Measurement of plasma insulin and glucose levels.

Related Experiment Videos

  • Assessment of platelet sensitivity to prostaglandin E1 and adenosine 3',5'-cyclic monophosphate (cAMP) formation.

    • Main Results:

    • Platelets from patients with AMI/UAP exhibited significantly fewer insulin binding sites (192 +/- 84/cell) compared to normal platelets (496 +/- 76/cell).
    • Patients presented with relatively low plasma insulin (20 microU/mL) and elevated glucose (130 mg/dL) levels during the acute phase.
    • Insulin binding and plasma insulin levels normalized within 8-12 weeks of recuperation.
    • The changes in insulin binding were correlated with altered platelet sensitivity to prostaglandin E1, mediated by cAMP signaling.

    Conclusions:

    • Acute ischemic conditions, such as AMI and UAP, lead to a significant reduction in platelet insulin binding sites.
    • This reduction is reversible and improves with patient recovery, indicating a dynamic process.
    • Platelet insulin binding is linked to prostaglandin E1-induced cAMP formation, suggesting a role in modulating platelet function during ischemia and recovery.