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Related Experiment Videos

Trimethyltin effects on auditory function and cochlear morphology.

K M Crofton1, K F Dean, M G Ménache

  • 1Neurotoxicology Division, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711.

Toxicology and Applied Pharmacology
|August 1, 1990
PubMed
Summary

Trimethyltin (TMT) exposure causes high-frequency hearing loss in rats. This neurotoxicant damages cochlear outer hair cells, confirmed by auditory startle response and brainstem auditory evoked response tests.

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Area of Science:

  • Neuroscience
  • Auditory Science
  • Toxicology

Background:

  • Trimethyltin (TMT) is a known neurotoxicant.
  • TMT exposure can alter auditory function.

Purpose of the Study:

  • To compare TMT-induced auditory dysfunction using multiple techniques.
  • To investigate the relationship between TMT dosage and hearing impairment.

Main Methods:

  • Adult male rats were exposed to varying doses of TMT.
  • Auditory thresholds were measured using auditory startle response (ASR) and brainstem auditory evoked response (BAER).
  • Cochlear histology was assessed to examine hair cell damage.

Main Results:

  • TMT exposure resulted in dose-dependent high-frequency hearing loss.

Related Experiment Videos

  • Elevated ASR thresholds were observed for 40-kHz tones across all TMT groups.
  • BAER thresholds for 40- and 80-kHz tones increased in higher TMT dosage groups.
  • Cochlear histology showed outer hair cell loss in high-frequency regions.

    • Conclusions:

    • ASR and BAER are effective in detecting TMT-induced auditory dysfunction.
    • TMT-induced high-frequency hearing loss is linked to cochlear damage, specifically outer hair cell degeneration.
    • These findings highlight TMT's ototoxic potential.