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Nonosmotic diabetic cataracts.

J I Malone1, S Lowitt, W R Cook

  • 1Department of Pediatrics and Diabetes Center, University of South Florida, College of Medicine, Tampa 33612.

Pediatric Research
|March 1, 1990
PubMed
Summary
This summary is machine-generated.

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Diabetic cataracts may form due to oxidative stress, not just osmotic imbalance from sorbitol. Reduced taurine levels in the eye lens may increase cataract risk in diabetes.

Area of Science:

  • Biochemistry
  • Ophthalmology
  • Diabetology

Background:

  • Diabetic cataracts are linked to sorbitol accumulation in the lens.
  • Osmotic stress from sorbitol-induced water influx is a proposed mechanism.
  • Previous research suggests other factors beyond osmotic stress are involved.

Purpose of the Study:

  • To investigate the role of sorbitol and taurine in diabetic cataract formation.
  • To determine if aldose reductase inhibition prevents diabetic cataracts.
  • To elucidate the mechanism of sugar cataractogenesis in vivo.

Main Methods:

  • Utilized rat lenses from streptozotocin-induced diabetes models (21 and 44 days).
  • Measured lens sorbitol, taurine, and water content.
  • Administered the aldose reductase inhibitor Sorbinil to assess its effects.

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Main Results:

  • Cataracts formed in 44-day diabetic rats but not 21-day rats; sorbitol increased in both.
  • Lens taurine levels inversely correlated with sorbitol, maintaining osmotic balance.
  • Sorbinil prevented sorbitol increase and cataract formation, normalizing taurine levels.

Conclusions:

  • The osmotic mechanism is unlikely due to reciprocal changes in sorbitol and taurine.
  • Reduced lens taurine may enhance oxidative stress, contributing to cataract formation.
  • Diabetic sugar cataracts may primarily be an oxidative process.