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Hypertriglyceridemia in experimental diabetes: relationship to cardiac dysfunction

B Rodrigues1, P F Grassby, M L Battell

  • 1Division of Pharmacology and Toxicology, Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada.

Canadian Journal of Physiology and Pharmacology
|May 1, 1994
PubMed
Summary

Diabetic rats show impaired cardiac function linked to hypertriglyceridemia. However, improving myocardial glucose utilization, not just lowering triglycerides, appears more critical for preventing heart dysfunction in diabetic conditions.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Metabolic Diseases

Background:

  • Cardiovascular disease mortality is elevated in diabetic patients.
  • Diabetes can lead to cardiac dysfunction, potentially linked to metabolic changes like hypertriglyceridemia.

Purpose of the Study:

  • To investigate if hypertriglyceridemia contributes to diabetes-induced cardiac dysfunction.
  • To evaluate the efficacy of various treatments in preventing cardiac dysfunction in diabetic rats.

Main Methods:

  • Streptozotocin-induced diabetes model in rats.
  • Isolated heart preparations to assess cardiac function (left ventricular pressure, +/- dP/dt).
  • Administration of hydralazine, clofibrate, verapamil, prazosin, enalapril, benazepril, and dichloroacetate.

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Main Results:

  • Diabetes induced hyperlipidemia and depressed cardiac function.
  • Hydralazine treatment prevented cardiac dysfunction and lowered triglycerides.
  • Most other treatments reduced triglycerides but failed to prevent heart dysfunction.
  • Dichloroacetate improved cardiac function in early-stage diabetic rats.

Conclusions:

  • While hypertriglyceridemia may play a role, it might not be the primary driver of cardiac dysfunction in chronic diabetes.
  • Improving myocardial glucose utilization appears more critical than triglyceride lowering for preventing cardiac dysfunction in diabetic rats.