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Neuromodulatory effects of the dorsal hippocampal endocannabinoid system in dextromethorphan/morphine-induced amnesia.

Abstract：

:Dextromethorphan which is an active ingredient in many cough medicines has been previously shown to potentiate amnesic effect of morphine in rats. However, the effect of dextromethorphan, that is also a noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonist, in combination with morphine on hippocampus-based long term memory has not been well characterized. The aim of the present study was to assess the possible role of endocannabinoid system of the dorsal hippocampus in dextromethorphan /morphine-induced amnesia. Our results showed that intraperitoneal (i.p.) injection of morphine (5mg/kg) or dextromethorphan (5-15mg/kg) before testing the passive avoidance learning induced amnesia. Combination of ineffective doses of dextromethorphan (7.5mg/kg, i.p.) and morphine (2mg/kg, i.p.) also produced amnesia, suggesting the enhancing effects of the drugs. To assess the effect of the activation or inhibition of the dorsal hippocampal cannabinoid CB1 receptors on this amnesia, ACPA or AM251 as selective receptor agonists or antagonists were respectively injected into the CA1 regions before systemic injection of dextromethorphan and morphine. Interestingly, intra-CA1 microinjection of ACPA (0.5-1ng/rat) improved the amnesic effect of dextromethorphan /morphine combination. The microinjection of AM251 into the CA1 region enhanced the response of the combination of dextromethorphan /morphine in inducing amnesia. Moreover, Intra-CA1 microinjection of AM251 inhibited the improving effect of ACPA on dextromethorphan /morphine-induced amnesia. It is important to note that intra-CA1 microinjection of the same doses of the agonist or antagonist by itself had no effects on memory formation. Thus, it can be concluded that the dorsal hippocampal endocannabinoid system, via CB1 receptor-dependent mechanism, may be involved in morphine/dextromethorphan -induced amnesia.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Ghasemzadeh Z,Rezayof A

doi

10.1016/j.ejphar.2016.11.025

subject

Has Abstract

pub_date

2017-01-05 00:00:00

pages

100-105

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(16)30728-2

journal_volume

794

pub_type

杂志文章

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