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Ouabain-induced cochlear degeneration in rat.

Yong Fu1, Dalian Ding, Haiyan Jiang

  • 1Department of Otorhinolaryngology, First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, Zhejiang, China.

Neurotoxicity Research
|April 6, 2012
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Summary

Ouabain selectively damages spiral ganglion neurons (SGNs) at low concentrations, creating an auditory neuropathy model in rats. Higher concentrations also harm cochlear hair cells, with damage decreasing apically.

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Area of Science:

  • Ototoxicology
  • Neuroscience
  • Auditory research

Background:

  • Ouabain, a Na+/K+-ATPase inhibitor, has differential effects on auditory structures in various species.
  • Understanding ouabain's impact on the rat inner ear is crucial for auditory research.

Purpose of the Study:

  • To investigate the concentration-dependent effects of ouabain on the rat inner ear.
  • To characterize the cellular and functional consequences of ouabain exposure in rats.

Main Methods:

  • Application of 1 mM and 10 mM ouabain to the rat round window membrane.
  • Assessment of auditory function using distortion product otoacoustic emissions (DPOAE) and auditory brainstem responses (ABR).
  • Histological examination of cochlear pathology, including spiral ganglion neurons (SGNs) and hair cells, and TUNEL staining for apoptosis.

Main Results:

  • Low-dose (1 mM) ouabain elevated high-frequency ABR thresholds with normal DPOAEs, causing selective SGN and auditory nerve damage at the cochlear base.
  • High-dose (10 mM) ouabain increased ABR thresholds and reduced DPOAE amplitudes, damaging both SGNs and hair cells, with damage diminishing towards the apex.
  • Degenerating cells exhibited apoptotic features, confirmed by TUNEL positivity.

Conclusions:

  • Ouabain-induced cochlear degeneration in rats is concentration-dependent and apoptotic.
  • Low ouabain concentrations create a model of partial auditory neuropathy by damaging basal SGNs.
  • High ouabain concentrations cause widespread damage to SGNs and hair cells, with a base-to-apex gradient.