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Related Experiment Videos

Histologic changes during selenite cataractogenesis: a light microscopy study.

T R Shearer, R S Anderson

    Experimental Eye Research
    |April 1, 1985
    PubMed
    Summary
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    Selenite overdose causes early lens changes, starting with vacuolization at the lens bow. This progresses to nuclear opacity and fiber damage, forming selenite-induced cataracts.

    Area of Science:

    • Ophthalmology
    • Toxicology
    • Histology

    Background:

    • Cataracts are a leading cause of blindness worldwide.
    • Understanding the early mechanisms of cataract formation is crucial for developing preventative strategies.
    • Selenite-induced cataracts in animal models provide a valuable tool for studying cataractogenesis.

    Purpose of the Study:

    • To investigate the early histological alterations in the lens during the development of selenite overdose cataract.
    • To identify the initial site of selenite toxicity within the lens structure.
    • To elucidate the sequential stages of histological changes leading to nuclear cataract formation.

    Main Methods:

    • Fourteen-day-old rat pups were administered a single dose of selenium (2.25 mg/kg body weight).

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  • Lenses were examined biomicroscopically at three distinct stages of cataract development.
  • Thin sections (1-2 microns) of methacrylate-embedded lenses were analyzed using light microscopy.

    • Main Results:

    • The initial observable change was vacuolization originating at the lens bow, spreading to the posterior subcapsular region (Stage 1).
    • Stage 2 involved increased basophilia at the junction of the peripheral nucleus and cortex.
    • Stage 3 demonstrated nuclear opacity with opaque particles, abnormal basophilic structures, and lens fiber damage.

    Conclusions:

    • The findings support the hypothesis that selenite initially targets the lens bow region.
    • This early attack leads to biochemical alterations, fiber damage, and impaired nutrient circulation.
    • These events collectively contribute to the formation of selenite-induced nuclear cataracts.