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Ascorbic acid repletion: A possible therapy for diabetic macular edema?

James M May1

  • 1Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232-6303, United States.

Free Radical Biology & Medicine
|February 23, 2016
PubMed
Summary

Ascorbic acid (vitamin C) may help prevent diabetic macular edema by protecting retinal cells from damage and improving blood vessel integrity. Further studies are needed to confirm if vitamin C supplementation can delay or reverse vision loss in diabetic retinopathy.

Keywords:
AscorbateDiabetesEndothelial cellsMacular edemaPericytes

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An Ex Vivo Tissue Culture Model for Fibrovascular Complications in Proliferative Diabetic Retinopathy
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Area of Science:

  • Ophthalmology
  • Diabetology
  • Vascular Biology

Background:

  • Diabetic retinopathy can cause macular edema, leading to vision loss due to fluid leakage from damaged retinal blood vessels.
  • Early signs include pericyte loss and endothelial dysfunction, compromising the blood-retinal barrier.
  • Oxidative stress, driven by high glucose and advanced glycation end products (RAGE), damages retinal cells.

Purpose of the Study:

  • To investigate the potential role of ascorbic acid (vitamin C) in preventing diabetic macular edema.
  • To explore whether ascorbate repletion can mitigate cellular damage and vascular leakage in the macula.

Main Methods:

  • Review of cellular mechanisms underlying diabetic macular edema, including oxidative stress and RAGE activation.
  • Analysis of in vitro cell culture studies examining vitamin C's effects on retinal cells exposed to high glucose and RAGE.

Main Results:

  • Cell culture studies indicate vitamin C prevents apoptosis in retinal endothelial cells and pericytes.
  • Ascorbic acid preserves nitric oxide production and tightens the endothelial permeability barrier.
  • Low ascorbic acid levels are observed in diabetic patients with poor glycemic control.

Conclusions:

  • Ascorbic acid shows promise in protecting against high-glucose and RAGE-induced damage in retinal cells.
  • Further pre-clinical and clinical studies are warranted to confirm vitamin C's efficacy in preventing or reversing diabetic macular edema.