Polyamine effects upon N-methyl-D-aspartate receptor functioning: differential alteration by glutamate and glycine site antagonists

Polyamine effects upon N-methyl-D-aspartate receptor functioning: differential alteration by glutamate and glycine site antagonists

Polyamines such as spermidine potentiate activation of the N-methyl-D-aspartate (NMDA)-type excitatory amino acid receptor. The goal of the present study was to investigate interactions between the putative polyamine binding site and previously described sites for glutamate and glycine. Binding of t...

Full description

Saved in:
Bibliographic Details
Published in:Brain research Vol. 561; no. 2; p. 285
Main Authors: Nussenzveig, I Z, Sircar, R, Wong, M L, Frusciante, M J, Javitt, D C, Zukin, S R
Format: Journal Article
Language:English
Published: Netherlands 11-10-1991
Subjects:
2-Amino-5-phosphonovalerate - pharmacology
Animals
Binding Sites
Cell Membrane - metabolism
Cerebral Cortex - metabolism
Dizocilpine Maleate - metabolism
Glutamates - metabolism
Glutamates - pharmacology
Glutamic Acid
Glycine - metabolism
Glycine - pharmacology
Hippocampus - metabolism
Kinetics
Kynurenic Acid - analogs & derivatives
Kynurenic Acid - pharmacology
Male
Radioligand Assay
Rats
Rats, Inbred Strains
Receptors, N-Methyl-D-Aspartate - drug effects
Receptors, N-Methyl-D-Aspartate - metabolism
Spermidine - pharmacology
Online Access:Get more information
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Polyamines such as spermidine potentiate activation of the N-methyl-D-aspartate (NMDA)-type excitatory amino acid receptor. The goal of the present study was to investigate interactions between the putative polyamine binding site and previously described sites for glutamate and glycine. Binding of the high-potency PCP receptor ligand [3H]MK-801 to well-washed rat brain membranes was used as an in vitro probe of NMDA receptor activation. Spermidine concentration-response studies were performed in the absence and presence of both glutamate and glycine, with and without D-(-)-2-amino-5-phosphonovaleric acid (D(-)-AP-5) or 7-chlorokynurenic acid (7Cl-KYN). Incubation in the presence of spermidine alone induced a 20.4-fold increase in [3H]MK-801 binding with an EC50 value of 13.3 microM. The mean concentration of spermidine which induced maximal stimulation of binding was 130 microM (n = 10, S.E.M. = 24.66, range = 25-250 microM). Glutamate (10 microM) decreased the EC50 value for spermidine-induced stimulation of [3H]MK-801 binding to 3.4 microM. Glycine (10 microM) did not significantly alter either maximum spermidine-induced [3H]MK-801 binding or the EC50 value for spermidine-induced stimulation of [3H]MK-801 binding. Incubation in the presence of the specific glutamate antagonist D(-)AP-5 attenuated [3H]MK-801 binding in a glutamate-reversible fashion. The competitive glycine antagonist 7Cl-KYN decreased maximum spermidine-induced [3H]MK-801 binding in a glycine-reversible fashion. In addition, 7Cl-KYN increased the EC50 value for spermidine-induced stimulation of [3H]MK-801 binding while D(-)AP-5 was without effect.
ISSN:0006-8993
DOI:10.1016/0006-8993(91)91606-2