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The Mouse Round-window Approach for Ototoxic Agent Delivery: A Rapid and Reliable Technique for Inducing Cochlear Cell Degeneration
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[Changes in morphofunctional condition of the cochlear vascular stripe in response to the ototoxic antibiotic]

A A Lantsov, E V Il'inskaia

    Vestnik Otorinolaringologii
    |September 19, 2003
    PubMed

    Insights

    Kanamycin, an aminoglycoside antibiotic, causes lasting damage to the vascular stripe (VS) in guinea pig cochleas. Even after 30 days, VS cells show impaired function and structure, indicating potential hearing loss risks.

    Area of Science:

    • Ototoxicity studies
    • Cellular biology
    • Pharmacology

    Context:

    • Aminoglycoside antibiotics like kanamycin are widely used but can cause ototoxicity.
    • The vascular stripe (VS) in the cochlea plays a crucial role in maintaining the inner ear environment.
    • Understanding the specific cellular effects of kanamycin on the VS is essential for assessing hearing loss risks.

    Purpose:

    • To investigate the ultrastructural and functional changes in the vascular stripe (VS) of guinea pig cochleas following kanamycin administration.
    • To evaluate the reversibility of these changes after cessation of kanamycin treatment.

    Summary:

    • Guinea pigs received intramuscular kanamycin (400 mg/kg) for 7 or 14 days.
    • Electron microscopy revealed minimal VS alterations after 7 days, but significant ultrastructural damage and suppressed secretory activity in marginal cells after 14 days.
    • Thirty days post-treatment, VS cell ultrastructure improved, yet marginal cell secretory function remained significantly impaired.

    Impact:

    • Kanamycin induces dose- and duration-dependent morphofunctional damage to VS cells.
    • These VS cellular deficits persist even after a 30-day recovery period, suggesting potential long-term consequences for hearing.
    • The findings highlight the ototoxic potential of kanamycin and underscore the need for careful monitoring during treatment.

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