1982526

Development and regulation of excitatory amino acid receptors involved in the release of arachidonic acid in cultured hippocampal neural cells.

Article date: 1990/12/1

PubMed ID: 1982526

Journal name: Brain research. Developmental brain research (ISSN: 0165-3806)

ABSTRACT

Release of [3H]arachidonic acid mediated by excitatory amino acid (EAA) receptors was investigated from prelabelled primary cultures of hippocampal neurons and astroglial cells. Treatment with N-methyl-D-aspartate (NMDA), quisqualate (QA) and kainate resulted in age- and dose-dependent stimulation of [3H]arachidonic acid release. During development, the maximum response for NMDA was observed relatively earlier (at 7 days) than those for QA and kainate (at 14 days) in the hippocampal neuronal cultures. The half maximal effects were obtained at about 15 microM NMDA at all ages studied and about 0.5 microM QA at 14 and 20 days. At optimum concentrations NMDA- and QA-induced releases were additive. Unlike with neurons, treatment with all the 3 EAA receptor agonists, NMDA, QA and kainate, had no significant effect on [3H]arachidonate release in hippocampal astroglial cells. In cultured 14-day-old neurons, the increases in NMDA- and QA-mediated [3H]arachidonic acid release were completely blocked by the NMDA receptor antagonist, 2-amino-5-phosphonovaleric acid, and the ionotropic QA receptor antagonist, 6-cyano-7-nitroquinoxaline-2,3-dione, respectively. But the iontropic QA receptor agonist alpha-amino-3-hydroxy-5-methyl-isoxazole-4- propionic acid (AMPA) had no significant effect on [3H]arachidonate release, indicating that interaction between ionotropic QA and metabolotropic QA receptors may be essential for optimal QA-mediated arachidonic acid release. At physiological concentrations of Mg2+ (1.2 mM), AMPA was found to potentiate NMDA-induced release of [3H]arachidonic acid; the effect appeared to be related to a removal of Mg2+ blockade mediated by mild depolarisation.(ABSTRACT TRUNCATED AT 250 WORDS)

This document is available from: http://directlinks.cc/files/muscimol/1982526.pdf

Author List: Patel A J, Sanfeliu C, Hunt A

Publication Types: Journal Article; Research Support, Non-U.S. Gov't

Substances mentioned in the article: Arachidonic Acids; Quinoxalines; Receptors, Amino Acid; Receptors, Cell Surface; Ibotenic Acid; Arachidonic Acid; N-Methylaspartate; 6-Cyano-7-nitroquinoxaline-2,3-dione; alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid; Quisqualic Acid;

Mesh terms: 6-Cyano-7-nitroquinoxaline-2,3-dione; Aging/metabolism; Animals; Arachidonic Acid; Arachidonic Acids/metabolism; Astrocytes/metabolism; Cells, Cultured; Female; Hippocampus/growth & development; Ibotenic Acid/analogs & derivatives; N-Methylaspartate/metabolism; Neurons/metabolism; Pregnancy; Quinoxalines/pharmacology; Quisqualic Acid/metabolism; Rats; Receptors, Amino Acid; Receptors, Cell Surface/metabolism; alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid;

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