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Related Experiment Videos

Changes during aging in rat lens endopeptidase activity.

K R Fleshman, B J Wagner

    Experimental Eye Research
    |November 1, 1984
    PubMed
    Summary
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    Lens aging and cataract development involve protein degradation. This study found that neutral proteinase activity and thermal stability decrease with lens cell age, with changes observed in enzyme forms over time.

    Area of Science:

    • Biochemistry
    • Ophthalmology
    • Gerontology

    Background:

    • Protein degradation is linked to lens aging and cataract formation.
    • Proteolytic enzymes are hypothesized to play a key role in these ocular processes.

    Purpose of the Study:

    • To investigate lens neutral proteinase activity and thermal stability.
    • To examine how these factors change with lens cell and animal age in rats.

    Main Methods:

    • Analysis of epithelial, cortical, and nuclear lens regions from rats aged 1 to 25 months.
    • Measurement of specific activity and thermal stability of lens neutral proteinase.
    • Evaluation of thermal stability curves to identify enzyme forms.

    Main Results:

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  • Specific activity and thermal stability decreased from the lens epithelium to the nucleus.
  • Cortical enzyme activity increased with animal age, while nuclear activity remained constant.
  • Thermal stability curves indicated a shift from a single enzyme form to multiple forms in the cortex with increasing animal age.

    • Conclusions:

    • Lens neutral proteinase activity and thermal stability are age-dependent.
    • Changes in enzyme forms may contribute to lens aging and the development of cataracts.