| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4116838 | Journal of Otology | 2008 | 6 Pages |
ObjectivesTo investigate changes in evoked potentials and structure of the guinea pig cochleae during whole cochlear perfusion with glutamate.MethodsCM, CAP, DPOAE, and ABR were recorded as indicators of cochlear functions during whole cochlear perfusion. The morphology of the cochlea was studied via transmission electron microscopy.ResultsThere were no significant changes in DPOAE amplitude before and after glutamate perfusion. CM I/O function remained nonlinear during perfusion. ABR latencies were delayed following glutamate perfusion. The average CAP threshold was elevated 35 dB SPL following glutamate perfusion.. The OHCs appeared normal, but the IHCs and afferent dendrites showed cytoplasmic blebs after glutamate perfusion.ConclusionsWhile being a primary amino acid neurotransmitter at the synapses between hair cells and spiral ganglion neurons, excessive glutamate is neurotoxic and can destroy IHCs and spiral ganglion neurons. The technique used in this study can also be used to build an animal model of auditory neuropathy.
