Glutamate-evoked Release of Endogenous Brain Dopamine: Inhibition by an Excitatory Amino Acid Antagonist and an Enkephalin Analogue

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 1987 Apr 1

PMID 2884003

Citations 9

Authors

K Jhamandas

M Marien

Affiliations

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Abstract

The present study examined the effect of a selective delta-opioid receptor agonist [D-Ala2-D-Leu5] enkephalin (DADL) on the spontaneous and the L-glutamic acid (L-Glu)-evoked release of endogenous dopamine from superfused slices of rat caudate-putamen. The amount of dopamine in slice superfusates was measured by a sensitive method employing high-performance liquid chromatography with electrochemical detection (h.p.l.c.-e.d.) after a two-step separation procedure. The spontaneous release of endogenous dopamine was partially dependent on Ca2+, enhanced in Mg2+-free superfusion medium, partially reduced by tetrodotoxin (TTX, 0.3 microM), partially reduced by the putative excitatory amino acid receptor antagonist DL-2-amino-7-phosphonoheptanoic acid (DL-APH, 1 mM), and increased 10 fold by the dopamine uptake blocker, nomifensine (10 microM). DADL (5 and 50 nM) did not significantly affect spontaneous dopamine release. L-Glu (0.1-10 mM) produced a concentration-dependent release of endogenous dopamine from slices of caudate-putamen. This effect was Ca2+-dependent, strongly inhibited by 1.2 mM Mg2+, attenuated by DL-APH (1 mM), attenuated by TTX (0.3 microM), and enhanced by nomifensine (10 microM). In the presence of nomifensine DADL (50 nM) reduced significantly the L-Glu-evoked release of endogenous dopamine by 20%. The inhibitory effect of DADL was blocked by 10 microM naloxone. These results indicate that L-Glu stimulates the Ca2+-dependent release of endogenous dopamine in the caudate-putamen by activation of N-methy-D-aspartate-type of excitatory amino acid receptors. This release can be selectively modified by the delta-opioid agonist DADL in a naloxone-sensitive manner.

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