ISSN:
1434-4726
Keywords:
Non-N-methyl-d-aspartate receptors
;
Cochlea
;
Hair cell
;
Neurotransmitter
;
6-Cyano-2,3-dihydroxy-7-nitroquinoxaline
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary 6-Cyano-2,3-dihydroxy-7-nitroquinoxaline (CNQX) is a new, potent and selective competitive antagonist for the non-N-methyl-d-aspartate (non-NMDA) type of excitatory amino acids receptors. We studied the effect of CNQX on the compound auditory nerve action potential (CAP), cochlear microphonics (CM), summating potential (SP) and endocochlear potential (EP). CNQX in doses of 10–20 μM reduced the CAP magnitude and increased the N1 latency without affecting the CM, SP, or EP. Parallel shifts of CAP amplitude- and latency-intensity functions were observed. The CAP suppressed by 10 μM CNQX was completely reversed by a 10-min washout with artificial perilymph. As 10 μM and 20 μM CNQX seem to exert a selective antagonism for non-NMDA receptors, results indicate that non-NMDA receptors play a major role in synaptic transmission from hair cells to auditory afferent nerves.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00634777
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