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Coupling of Inositol Phospholipid Metabolism with Excitatory Amino Acid Recognition Sites in Rat Hippocampus

Coupling of Inositol Phospholipid Metabolism with Excitatory Amino Acid Recognition Sites in Rat... Abstract: Ibotenate, a rigid structural analogue of glutamate, markedly enhances the hydrolysis of membrane inositol phospholipids, as reflected by the stimulation of (3H)inositol monophosphate formation in rat hippocampal slices prelabeled with (3H)inositol and treated with Li+. Quisqualate, homocysteate, l‐glutamate, and l‐aspartate also induce a significant (albeit weaker) increase in (3H)inositol monophosphate formation, whereas N‐methyl‐d‐aspartate, kainate, quinolinate, and N‐acetylaspartylglutamate are inactive. The increase in (3H)inositol monophosphate formation elicited by the above‐mentioned excitatory amino acids is potently and selectively antagonized by dl‐2‐amino‐4‐phosphonobutyric acid, a dicarboxylic amino acid receptor antagonist. These results suggest that, in the hippocampus, a class of dicarboxylic amino acid recognition sites is coupled with phospholipase C, the enzyme that catalyzes the hydrolysis of membrane inositol phospholipids. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurochemistry Wiley

Coupling of Inositol Phospholipid Metabolism with Excitatory Amino Acid Recognition Sites in Rat Hippocampus

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References (36)

Publisher
Wiley
Copyright
Copyright © 1986 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-3042
eISSN
1471-4159
DOI
10.1111/j.1471-4159.1986.tb12922.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: Ibotenate, a rigid structural analogue of glutamate, markedly enhances the hydrolysis of membrane inositol phospholipids, as reflected by the stimulation of (3H)inositol monophosphate formation in rat hippocampal slices prelabeled with (3H)inositol and treated with Li+. Quisqualate, homocysteate, l‐glutamate, and l‐aspartate also induce a significant (albeit weaker) increase in (3H)inositol monophosphate formation, whereas N‐methyl‐d‐aspartate, kainate, quinolinate, and N‐acetylaspartylglutamate are inactive. The increase in (3H)inositol monophosphate formation elicited by the above‐mentioned excitatory amino acids is potently and selectively antagonized by dl‐2‐amino‐4‐phosphonobutyric acid, a dicarboxylic amino acid receptor antagonist. These results suggest that, in the hippocampus, a class of dicarboxylic amino acid recognition sites is coupled with phospholipase C, the enzyme that catalyzes the hydrolysis of membrane inositol phospholipids.

Journal

Journal of NeurochemistryWiley

Published: Jan 1, 1986

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