Effect of 1-aminocyclopropanecarboxylic acid on N-methyl-D-aspartate-stimulated [3H]-noradrenaline release in rat hippocampal synaptosomes.

Abstract:

:1. The effect of 1-aminocyclopropanecarboxylic acid (ACPC), a partial agonist at the glycine site of the N-methyl-D-aspartate (NMDA) receptor complex that exhibits neuroprotective, anxiolytic and antidepressant-like actions, was investigated in a functional assay for presynaptic NMDA receptors. 2. NMDA (100 microM) produced a 36% increase of tritium efflux above basal efflux in rat hippocampal synaptosomes preincubated with [3H]-noradrenaline ([3H]-NA), reflecting a release of tritiated noradrenaline. This effect was prevented by 10 microM 7-chlorokynurenic acid, an antagonist of the glycine site of the NMDA receptor. 3. Glycine enhanced the effect of NMDA with Emax and EC50 values of 84 +/- 11% and 1.82 +/- 0.04 microM, respectively. ACPC potentiated the effect of NMDA on tritium overflow with a lower EC50 (43 +/- 6 nM) and a lower maximal effect (Emax = 40 +/- 9%) than glycine. Furthermore, ACPC (0.1 microM) shifted the EC50 of glycine from 1.82 microM to > or = 3 mM. 4. These results show that ACPC can reduce the potentiation by glycine of NMDA-evoked [3H]-NA release and hence, may act as an antagonist at the glycine site of presynaptic hippocampal NMDA receptors when the concentration of glycine is high.

journal_name

Br J Pharmacol

authors

Clos MV,Garcia Sanz A,Trullas R,Badia A

doi

10.1111/j.1476-5381.1996.tb15484.x

subject

Has Abstract

pub_date

1996-06-01 00:00:00

pages

901-4

issue

4

eissn

0007-1188

issn

1476-5381

journal_volume

118

pub_type

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