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Related Experiment Videos

Superoxide dismutase activity in the cochlea

M G Pierson, B H Gray

    Hearing Research
    |February 1, 1982
    PubMed
    Summary

    Superoxide dismutase (SOD) shows high activity in the cochlea's organ of Corti, suggesting a key role in protecting auditory neural tissues from oxidative stress. This copper-zinc isoenzyme is abundant in the cochlea, alongside catalase and glutathione peroxidase.

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    Area of Science:

    • Auditory Neuroscience
    • Biochemistry
    • Oto-toxicology

    Background:

    • The cochlea is a delicate neural tissue susceptible to oxidative damage.
    • Superoxide dismutase (SOD) is a critical antioxidant enzyme that neutralizes harmful superoxide radicals.

    Purpose of the Study:

    • To investigate the presence and specific activity of SOD in different cochlear fractions.
    • To identify the types of SOD isoenzymes present in the cochlea.
    • To examine the distribution of other peroxide-regulating enzymes in the cochlea.

    Main Methods:

    • Fractionation of cochlear tissue.
    • Assay of enzyme specific activity.
    • Cyanide inhibition assays to differentiate SOD isoenzymes.

    Main Results:

    • SOD exhibited significantly higher specific activity in the organ of Corti fraction compared to other neural tissues.
    • Copper-zinc SOD (Cu/Zn SOD) constituted approximately 74% of the total SOD activity in the organ of Corti fraction.
    • SOD activity was also detected in the stria vascularis fraction.
    • Catalase and glutathione peroxidase activities were prominent in both organ of Corti and stria vascularis fractions.

    Conclusions:

    • The cochlea, particularly the organ of Corti, possesses substantial SOD activity, predominantly the Cu/Zn isoenzyme.
    • These findings highlight the cochlea's robust antioxidant defense system, involving SOD, catalase, and glutathione peroxidase.
    • The high SOD levels suggest a critical role in protecting auditory structures from oxidative stress.

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