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Acoustic priming and kanamycin-induced chochlear damage

J M Tepper, K Schlesinger

    Brain Research
    |April 7, 1980
    PubMed
    Summary

    Audiogenic seizure susceptibility in mice is linked to outer hair cell damage in the cochlea. This damage occurs after acoustic priming or kanamycin treatment, even in resistant lines.

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    Area of Science:

    • Neuroscience
    • Otolaryngology
    • Genetics

    Background:

    • Audiogenic seizures are a model for studying epilepsy and sensory processing.
    • Selective breeding has created mouse lines with varying susceptibility to these seizures.
    • The inner ear's cochlea is implicated in auditory processing and seizure susceptibility.

    Purpose of the Study:

    • To investigate cochlear damage in mice selectively bred for differential susceptibility to priming-induced audiogenic seizures.
    • To compare cochlear pathology following acoustic priming and kanamycin treatment across different mouse lines.
    • To explore the relationship between a specific behavioral phenotype and physiological damage.

    Main Methods:

    • Histological examination of cochleae from three mouse lines (high, low, unselected) after acoustic priming and retest or kanamycin treatment.
    • Assessment of outer hair cell damage.
    • Correlation of cochlear pathology with audiogenic seizure susceptibility.

    Main Results:

    • Acoustic priming caused severe outer hair cell damage in high and unselected seizure-susceptible lines.
    • Low line mice, selected for resistance, showed no cochlear damage after acoustic priming.
    • Kanamycin treatment induced seizure susceptibility and outer hair cell damage in all lines, including the resistant low line.

    Conclusions:

    • Outer hair cell damage in the cochlea is associated with audiogenic seizure susceptibility.
    • The findings suggest a potential link between sensory organ damage and central nervous system supersensitivity.
    • This study provides insights into the physiological mechanisms underlying genetically determined seizure phenotypes.

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