Morphine Withdrawal in Cortical Slices: Suppression by Ca2+-channel Inhibitors of Abstinence-induced [3H]-noradrenaline Release

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 1988 Mar 1

PMID 2453241

Citations 8

Authors

D E Pellegrini-Giampietro

L Bacciottini

V Carla

F Moroni

Affiliations

Soon will be listed here.

Abstract

1. The effects of morphine withdrawal were evaluated in vitro by monitoring the actions of naloxone on the depolarization-induced release of [3H]-noradrenaline (NA) in cortical slices taken from naïve or dependent rats. The effects of dihydropyridine molecules acting on Ca2+-channels (nimodipine and Bay K 8644) were also studied in this model. 2. Naloxone (10(-8)-10(-5) M) dose-dependently enhanced the K+ induced release of [3H]-NA in slices taken from dependent rats, but failed to modify the [3H]-NA release from 'naïve' slices. 3. The naloxone-induced potentiation of release was significantly reversed by nimodipine (10(-8)-10(-6) M). These doses of nimodipine did not change [3H]-NA release (both basal and K+ induced) in preparations obtained from naïve rats. 4. Bay K 8644 potentiated the K+-induced [3H]-NA release from cortical slices taken from naïve rats to a similar extent as that of naloxone in dependent rats. 5. These results suggest that the naloxone potentiation of the depolarization-induced [3H]-NA release in slices taken from dependent rats may be considered a model of morphine withdrawal in vitro. In this model dihydropyridine Ca2+-channel antagonists suppress morphine-withdrawal effects in a similar manner to observations made in vivo.

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