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Related Experiment Videos

Effect of iodoacetic acid upon cochlear potentials.

T Kobayashi1, I Ise, D C Marcus

  • 1Department of Otolaryngology, Tohoku University School of Medicine, Sendai, Japan.

Acta Oto-Laryngologica. Supplementum
|January 1, 1987
PubMed
Summary

Iodoacetic acid (IAA) significantly impacts cochlear potentials, even under aerobic conditions. This challenges previous findings, showing IAA rapidly diminishes cochlear microphonics (CM) more effectively than ischemia alone.

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Area of Science:

  • Auditory Neuroscience
  • Otopathology

Background:

  • Previous research suggested iodoacetic acid (IAA) does not affect cochlear microphonics (CM) under aerobic conditions, but impacts postmortem CM (CM II) during ischemia.
  • This implied glycolysis is not vital for CM I but supports CM II.

Purpose of the Study:

  • To re-evaluate the effect of IAA on cochlear potentials under aerobic conditions.
  • To investigate the role of glycolysis in supporting cochlear function.

Main Methods:

  • Perilymphatic application of 5 X 10(-3) M IAA in guinea pigs.
  • Monitoring of endolymphatic potential and cochlear microphonics (CM) under aerobic and ischemic conditions.

Main Results:

  • IAA caused a rapid and significant drop in CM to <0.5% within 40 min, even under aerobic conditions.

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  • This decline was substantially faster than that observed during total ischemia (120 min).
  • An anoxia-sensitive negative potential component was observed with severe IAA intoxication.

    • Conclusions:

    • IAA significantly affects cochlear potentials, including CM, under aerobic conditions, contradicting prior reports.
    • Glycolysis plays a crucial role in maintaining cochlear potentials even during aerobic states.
    • IAA's effects on CM II and the organ of Corti warrant further investigation.