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Related Experiment Videos

Trimethyltin disrupts auditory function and cochlear morphology in pigmented rats.

V Hoeffding1, L D Fechter

  • 1Division of Toxicological Sciences, Johns Hopkins University, School of Hygiene and Public Health, Baltimore, MD 21205.

Neurotoxicology and Teratology
|March 1, 1991
PubMed
Summary

Trimethyltin (TMT) causes hearing loss in rats by damaging cochlear outer hair cells. This study links TMT-induced auditory deficits to specific pathological changes in the cochlea, particularly at high frequencies.

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Area of Science:

  • Neuroscience
  • Ototoxicology

Background:

  • Trimethyltin (TMT) is known to induce auditory deficits.
  • The precise cochlear mechanisms underlying TMT-induced hearing loss require further elucidation.

Purpose of the Study:

  • To identify pathological changes in the rat cochlea after TMT exposure.
  • To correlate these cochlear pathologies with changes in auditory thresholds.

Main Methods:

  • Auditory thresholds were measured using reflex-modulation audiometry before and after TMT or saline treatment.
  • Cochleas were examined using block-surface preparations and radial sections at various time points post-treatment.

Main Results:

  • TMT induced significant threshold shifts, especially at high frequencies (40 kHz), within one week.

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  • Outer hair cell (OHC) loss in the basal cochlear turn was observed as early as 48 hours post-TMT.
  • Progressive pathology included inner hair cell and spiral ganglion cell loss, correlating with auditory sensitivity decline.

    • Conclusions:

    • TMT exposure leads to significant and frequency-dependent auditory deficits in rats.
    • Outer hair cell damage in the basal cochlea is a primary factor in high-frequency hearing loss induced by TMT.