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Oxidative damage to human lens enzymes.

J Jedziniak, M Arredondo, U Andley

    Current Eye Research
    |February 1, 1987
    PubMed
    Summary

    Oxidative stress from active oxygen species damages human lens enzymes like glutathione reductase and glyceraldehyde-3-P dehydrogenase. Methylene blue accelerates this damage, suggesting lens protein and enzyme damage in oxidative conditions.

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    Area of Science:

    • Biochemistry
    • Ophthalmology
    • Oxidative Stress Research

    Background:

    • Human lens proteins, crystallins, are susceptible to oxidative damage.
    • Enzymatic dysfunction contributes to lens opacification and cataract formation.
    • Understanding oxidative damage mechanisms is crucial for preventing lens diseases.

    Purpose of the Study:

    • To investigate the impact of active oxygen species on key human lens enzymes.
    • To compare the damaging effects of methylene blue and riboflavin as photosensitizers.
    • To determine if oxidative stress affects enzyme activity and lens protein integrity.

    Main Methods:

    • Enzyme activities of aldehyde dehydrogenase, glyceraldehyde-3-P dehydrogenase, polyol dehydrogenase, triosephosphate isomerase, and glutathione reductase were measured.
    • Enzymes were exposed to active oxygen species generated by methylene blue or riboflavin under light.
    • Enzyme activity was monitored over a 60-minute interval before and after oxidation.

    Main Results:

    • Active oxygen species rapidly reduced glutathione reductase and glyceraldehyde-3-P dehydrogenase activity.
    • Triosephosphate isomerase activity remained unaffected.
    • Polyol dehydrogenase activity decreased after a delay, while aldehyde dehydrogenase retained 50% activity.
    • Methylene blue caused faster enzyme activity decline than riboflavin and acted as a direct inhibitor.

    Conclusions:

    • Singlet oxygen formation damages human lens enzymes associated with crystallin components.
    • Oxidative stress significantly impairs critical enzymatic functions within the human lens.
    • Methylene blue is a potent inducer of oxidative damage to lens enzymes, highlighting its potential role in lens pathology.

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