Article date: 1992/6/19
PubMed ID: 1380899
Journal name: Brain research. Developmental brain research (ISSN: 0165-3806)
The developmental pharmacology of excitatory amino acid (EAA) receptors in the chick cochlear nucleus (nucleus magnocellularis, NM) was studied by means of bath application of drugs and recording of synaptically-evoked field potentials in brain slices taken from chicks aged embryonic day (E) 14 through hatching (E21). The abilities of various EAA agonists (N-methyl-D-aspartate [NMDA], kainic acid, and alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid [AMPA]) to suppress postsynaptic responses by depolarization block and of EAA antagonists ((3-[RS]-2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid [CCP], dizocilpine [MK-801], 6-nitro-7-sulfamoyl-benzo(F)quinoxaline-2,3 dione [NBQX], 6-cyano-7-nitroquinoxaline-2,3-dione [CNQX] and 6,7-dinitroquinoxaline-2,3-dione [DNQX]) to suppress these responses directly were assessed quantitatively. The results support the existence of NMDA receptors in NM and suggest that the ability of these receptors to influence synaptically-evoked responses declines dramatically during the last week of embryonic life. The results similarly suggest that the non-NMDA receptors in NM undergo changes in density and/or function during a period of development when the cochlear nucleus is undergoing a variety of morphological and functional transformations.
Author List: Zhou N, Parks T N
Publication Types: Journal Article; Research Support, U.S. Gov't, P.H.S.
Substances mentioned in the article: Anticonvulsants; Piperazines; Quinolinic Acids; Quinoxalines; Receptors, N-Methyl-D-Aspartate; Receptors, Neurotransmitter; 2,3-dioxo-6-nitro-7-sulfamoylbenzo(f)quinoxaline; SDZ EAA 494; Ibotenic Acid; N-Methylaspartate; Dizocilpine Maleate; 6-Cyano-7-nitroquinoxaline-2,3-dione; alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; Quinolinic Acid;
Mesh terms: 6-Cyano-7-nitroquinoxaline-2,3-dione; Animals; Anticonvulsants/pharmacology; Chick Embryo; Cochlear Nerve/drug effects; Dizocilpine Maleate/pharmacology; Dose-Response Relationship, Drug; Electric Stimulation; Embryonic and Fetal Development; Evoked Potentials/drug effects; Ibotenic Acid/analogs & derivatives; N-Methylaspartate/pharmacology; Piperazines/pharmacology; Quinolinic Acid; Quinolinic Acids/pharmacology; Quinoxalines/pharmacology; Receptors, N-Methyl-D-Aspartate/drug effects; Receptors, Neurotransmitter/drug effects; Synapses/drug effects; Synaptic Transmission/drug effects; alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid;