Abstract:
:The present study was designed to investigate possible involvement of the central amygdala (CeA) nicotinic acetylcholine (nACh) and 5-hydroxytryptamine 1A (5-HT1A) receptors in the reversal effect of nicotine and 3,4-methylenedioxy-N-methylamphetamine (MDMA or ecstasy) on morphine-induced amnesia. Two guide cannulas were stereotaxically implanted in the CeA regions and a step-through passive avoidance task was used for the assessment of memory retrieval in adult male Wistar rats. Our results indicated that post-training s.c. administration of morphine (3-7-mg/kg) impaired memory retrieval. Pre-test administration of nicotine (0.3- and 0.5-mg/kg, s.c.) reversed morphine-induced amnesia. In addition, pre-test intra-CeA injection of MDMA (1-2-μg/rat) with an ineffective dose of nicotine (0.1-mg/kg, s.c.) improved memory retrieval, suggesting the interactive effect of the drugs on memory formation. It should be noted that that pre-test intra-CeA injection of 2-μg/rat of MDMA by itself produced amnesia. Interestingly, pre-test intra-CeA injection of mecamylamine, a nACh receptor antagonist (1-2-μg/rat) or (S)-WAY 100135 (0.25-1-μg/rat), a selective 5-HT1A receptor antagonist inhibited the improvement of morphine-induced amnesia which was produced by pre-test co-injection of nicotine and MDMA. Pre-test intra-CeA injection of the same doses of MDMA, mecamylamine or (S)-WAY 100135 by itself had no effect on morphine-induced amnesia. Moreover, pre-test injection of the same doses of mecamylamine or (S)-WAY 100135 into the CeA alone could not change memory retrieval. Taken together, it can be concluded that there is a functional interaction between morphine, nicotine and MDMA via the CeA nicotinic and serotonergic receptor mechanisms in passive avoidance memory retrieval. Moreover, cross state-dependent memory retrieval may have been induced between the drugs and this probably depends on the rewarding effects of the drugs.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Tirgar F,Rezayof A,Zarrindast MRdoi
10.1016/j.neuroscience.2014.07.014subject
Has Abstractpub_date
2014-09-26 00:00:00pages
392-402eissn
0306-4522issn
1873-7544pii
S0306-4522(14)00577-6journal_volume
277pub_type
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