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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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Pattern of cochlear damage caused by short-term kanamycin application using the round window microcatheter method.

Yasuyuki Hashimoto1, Satoshi Iwasaki, Kunihiro Mizuta

  • 1Department of Otolaryngology, Hamamatsu University School of Medicine, Hamamatsu city, Japan. hashimot@hama-med.ac.jp

Acta Oto-Laryngologica
|March 17, 2007
PubMed
Summary

Short-term microcatheter delivery of kanamycin to the cochlea allows control over drug effects. Adjusting kanamycin concentration and administration time influences the extent and severity of cochlear damage.

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Area of Science:

  • Ototoxicity research
  • Auditory neuroscience
  • Pharmacology

Background:

  • Kanamycin is an ototoxic antibiotic.
  • Understanding localized drug delivery to the cochlea is crucial for minimizing side effects.
  • The microcatheter method offers precise control over drug administration.

Purpose of the Study:

  • To evaluate the impact of short-term kanamycin administration via microcatheter on cochlear stereociliary bundle loss.
  • To investigate the influence of varying kanamycin concentrations and administration durations on ototoxicity in a guinea pig model.

Main Methods:

  • Kanamycin was administered to guinea pig cochleae using a microcatheter at concentrations of 172.5 mg/ml or 345 mg/ml.
  • Administration occurred over 1-hour or 2-hour periods at a rate of 0.1 ml/h.
  • Stereociliary bundle loss was assessed via scanning electron microscopy (SEM), and auditory function was evaluated using auditory brainstem response (ABR).

Main Results:

  • Higher kanamycin concentrations resulted in more severe cochlear damage.
  • While total dose determined damage severity, longer administration periods led to a wider region of damage.
  • Observed morphological changes in stereociliary bundles correlated with functional deficits measured by ABR.

Conclusions:

  • Short-term, localized kanamycin application via microcatheter enables control over the extent and severity of cochlear ototoxicity.
  • Modulating kanamycin concentration and administration time are key factors in managing cochlear drug effects.