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Corneal epithelial changes in diabetic rats

J Friend, Y Ishii, R A Thoft

    Ophthalmic Research
    |January 1, 1982
    PubMed
    Summary

    Diabetic rat eye microscopy revealed cellular changes like increased glycogen and basement membrane thickening. These corneal alterations occurred without significant sorbitol accumulation, suggesting osmotic damage isn't the primary cause.

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    Area of Science:

    • Ophthalmology
    • Diabetology
    • Cell Biology

    Background:

    • Diabetic retinopathy is a leading cause of blindness.
    • Corneal complications in diabetes can impair vision.
    • The role of the polyol pathway in diabetic corneal disease is debated.

    Purpose of the Study:

    • To investigate the morphological changes in the corneal epithelium of diabetic rats.
    • To determine the correlation between sorbitol pathway product accumulation and these changes.

    Main Methods:

    • Electron microscopy was used to examine corneal tissues from streptozotocin-induced diabetic rats.
    • Levels of glycogen, glucose, sorbitol, and fructose in corneal epithelium were quantified.
    • Biochemical analysis was performed on samples from short- and long-term diabetic rats.

    Main Results:

    • Diabetic rat corneas showed increased intracellular tonofilaments and glycogen.
    • Subepithelial basement membranes exhibited thickening and infoldings.
    • Basal cells displayed degeneration after 8 months of diabetes.
    • A minor increase in sorbitol pathway products (less than 1.0 mosm/1 tissue water) was observed, consistent with findings in rabbits and humans.

    Conclusions:

    • Morphological alterations in the diabetic corneal epithelium occur independently of significant sorbitol accumulation.
    • Osmotic damage from sorbitol is unlikely to be a major contributor to diabetic corneal disease.

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