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Glutamate neurotoxicity in rat auditory system: cochlear nuclear complex.

L Schweitzer¹, K F Jensen, R Janssen

¹Department of Anatomical Sciences and Neurobiology, University of Louisville School of Medicine, KY 40292.

Neurotoxicology and Teratology

|March 1, 1991

Summary

High doses of glutamate cause neurotoxicity in rat cochlear nuclei, particularly affecting neurons receiving input from the cochlear nerve. This study investigates glutamate

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Area of Science:

Neuroscience
Auditory System Research
Neurotoxicology

Background:

Glutamate neurotoxicity is a known phenomenon in the hypothalamus and hippocampus.
Previous research demonstrated glutamate's toxicity to rat spiral ganglion cells in the inner ear.

Purpose of the Study:

To investigate the effects of high glutamate doses on cochlear nuclei neurons in rats.
To assess morphological and size alterations in the cochlear nuclear complex and its subdivisions.

Main Methods:

Administration of high doses of glutamate intraperitoneally to rats.
Morphological and size analysis of the cochlear nuclear complex and its neurons.
Evaluation of neuron size and density within the cochlear nucleus.

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Main Results:

Glutamate administration induced severe anatomical alterations in the cochlear nuclei.
The anteroventral cochlear nucleus showed the most pronounced changes.
Neurons receiving input from the end bulbs of Held were particularly affected.

Conclusions:

High glutamate levels cause significant neurotoxic effects on cochlear nuclei.
The observed damage may be a direct effect or secondary to cochlear nerve fiber degeneration.