Journal
ACTA OTO-LARYNGOLOGICA
Volume 120, Issue 3, Pages 359-362Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/000164800750000568
Keywords
afferent; cochlea; hair cell; human; immunomorphology; neurotransmitter; spiral ganglion
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Glutamate, the most important afferent neurotransmitter in the auditory system, is thought to be the afferent transmitter between the cochlear inner hair cells and afferent neurons, hitherto visualized only in the cochlea of animal species. It has been identified for the first time in sections from the human inner ear, L-glutamate, NMDAR2B and the enzyme glutamine synthetase were identified by using monoclonal antibodies. The distribution pattern of the transmitter L-glutamate in the human cochlea is similar to that observed in other mammals. L-glutamate was identified adjacent to outer and inner hail cells and in the spiral ganglion. Similar distributions were found for glutamine synthetase and the ionotropic NMDA receptor subunit NMDAR2. The identification of neurotransmitters and their receptors in the human cochlea has implications for the pharmacotherapy of inner ear diseases.
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