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Updated: Jan 19, 2026

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Impaired Endothelium-Dependent Hyperpolarization Underlies Endothelial Dysfunction during Early Metabolic Challenge:

Rana Alaaeddine1, Mohammed A W Elkhatib1, Ali Mroueh1

  • 1Departments of Pharmacology and Therapeutics (R.A., A.M., A.F.E.-Y.) and Anatomy, Cell Biology, and Physiology (M.E.E.-S.), Faculty of Medicine, American University of Beirut, Beirut, Lebanon; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt (M.A.W.E., H.F., E.I.S., A.F.E.-Y.); and Department of Pharmacology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada (F.P.).

The Journal of Pharmacology and Experimental Therapeutics
|September 13, 2019
PubMed
Summary

Early metabolic challenges impair blood vessel function by reducing inward-rectifier potassium channels, leading to endothelial dysfunction. This study highlights these channels as a potential therapeutic target for early intervention in metabolic diseases.

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Area of Science:

  • Vascular Biology
  • Metabolic Disease
  • Endothelial Function

Background:

  • Endothelial dysfunction is a key feature of diabetic vasculopathies, but early mechanisms in prediabetes are unclear.
  • Hyperglycemia is often implicated, but other metabolic factors may initiate damage earlier.

Purpose of the Study:

  • To investigate the mechanisms of early endothelial dysfunction in a prediabetes rat model.
  • To identify potential therapeutic targets for preventing vascular complications.

Main Methods:

  • Utilized a high-calorie fed rat model exhibiting hyperinsulinemia and hypercholesterolemia.
  • Assessed aortic ring relaxation, ion channel function (inward-rectifier potassium channels), reactive oxygen species (ROS) levels, and connexin-43 expression.
  • Investigated the effects of atorvastatin and gap junction blockers.

Main Results:

  • High-calorie fed rats showed impaired endothelium-dependent relaxation, reduced inward-rectifier potassium channel expression and function, and increased vascular ROS.
  • Atorvastatin treatment improved endothelial function and reduced ROS.
  • Increased connexin-43 expression correlated with impaired relaxation, suggesting ROS transfer to the endothelium.

Conclusions:

  • Early metabolic challenges, independent of severe hyperglycemia, induce endothelial dysfunction by reducing inward-rectifier potassium channel-mediated relaxation and increasing oxidative stress.
  • Targeting inward-rectifier potassium channels and reducing ROS may be effective strategies for early intervention in metabolic vascular disease.