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Related Experiment Videos

Iris vasculopathy in galactose-fed rats.

L E Caspers-Velu1, K C Wadhwani, S I Rapoport

  • 1Laboratory of Ocular Therapeutics, National Eye Institute, National Institutes of Health, Bethesda, MD, 20892, USA.

Experimental Eye Research
|March 9, 1999
PubMed
Summary

Aldose reductase inhibitors prevent iris vessel changes in diabetic rats. This suggests the sorbitol pathway contributes to diabetic eye complications, offering potential therapeutic targets.

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Area of Science:

  • Ophthalmology
  • Diabetic Complications
  • Vascular Biology

Background:

  • Diabetic retinopathy is a leading cause of blindness.
  • Iris vessel changes, including increased permeability, are observed in diabetes.
  • The role of the sorbitol pathway in these changes is not fully understood.

Purpose of the Study:

  • To investigate the role of aldose reductase in iris vessel changes in a rat model.
  • To evaluate the efficacy of aldose reductase inhibitors in preventing these changes.

Main Methods:

  • Rats were fed a 50% galactose diet for 7-18 months, with or without aldose reductase inhibitors (AL 1576, sorbinil, ponalrestat).
  • Iris vessel morphology and permeability were assessed.
  • Computerized analysis quantified changes in iris vessel lumen area.

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Main Results:

  • Long-term galactose feeding induced significant iris vessel changes, including breakdown of the blood-aqueous barrier.
  • Aldose reductase inhibitors AL 1576 and sorbinil completely prevented these changes.
  • Ponalrestat partially reduced the progression of iridal vessel alterations.
  • Vascular area near the pupillary border decreased 18-fold in untreated galactose-fed rats.

Conclusions:

  • The sorbitol pathway is strongly implicated in the development and progression of iris vessel changes.
  • Aldose reductase inhibitors show potential for preventing or treating diabetic iris complications.