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Simultaneous control of hyperglycemia and oxidative stress normalizes endothelial function in type 1 diabetes

Antonio Ceriello1, Sudhesh Kumar, Ludovica Piconi

  • 1Centre of Excellence in Diabetes and Endocrinology, University Hospital of Coventry and Warwickshire, Warwick Medical School, University of Warwick, Coventry, UK. antonio.ceriello@warwick.ac.uk

Diabetes Care
|March 1, 2007
PubMed

Insights

In type 1 diabetes, combining insulin and vitamin C normalized endothelial dysfunction and oxidative stress. Neither treatment alone improved these markers, suggesting a synergistic effect for managing diabetic complications.

Area of Science:

  • Endocrinology
  • Vascular Biology
  • Metabolic Diseases

Background:

  • Endothelial dysfunction persists in type 1 diabetes despite normalized glycemia.
  • Oxidative stress is a key mediator of hyperglycemia-induced endothelial dysfunction.

Purpose of the Study:

  • To investigate the combined effect of insulin and vitamin C on endothelial dysfunction and oxidative stress in type 1 diabetes.
  • To determine if normalizing glycemia alone or with vitamin C can reverse endothelial dysfunction.

Main Methods:

  • Thirty-six type 1 diabetic patients and 12 controls were studied.
  • Diabetic patients received insulin, vitamin C, or both for 24 hours.
  • Endothelial function and oxidative stress markers were assessed.

Main Results:

  • Neither insulin nor vitamin C alone normalized endothelial dysfunction or oxidative stress.
  • Combined insulin and vitamin C treatment normalized both endothelial dysfunction and oxidative stress.
  • Near-normalization of glycemia alone did not resolve endothelial dysfunction.

Conclusions:

  • Long-lasting hyperglycemia in type 1 diabetes may cause permanent endothelial cell alterations.
  • Increased oxidative stress contributes to persistent endothelial dysfunction.
  • Combination therapy with insulin and vitamin C shows promise for managing endothelial dysfunction in type 1 diabetes.
Abstract

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