Volume 28, Issue 1 (March 2024)
Physiol Pharmacol 2024, 28(1): 66-79 |
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Beirami E, Seyedhosseini Tamijani S M. Effects of CA1 α2-adrenergic receptors on morphine-induced exploratory behaviors. Physiol Pharmacol 2024; 28 (1) : 9
URL: http://ppj.phypha.ir/article-1-2138-en.html
URL: http://ppj.phypha.ir/article-1-2138-en.html
Abstract: (450 Views)
Introduction: The adrenergic and opioidergic systems play a crucial role in regulating cognitive and non-cognitive behaviors. The aim of this study was to evaluate the effects of CA1 α2-adrenoceptors on the exploratory behaviors induced by morphine.
Methods: This assessment was conducted in rats using the elevated plus-maze test based on a test-retest paradigm. Bilateral guide cannulas were stereotaxically implanted in the CA1 regions of rats to allow intra-CA1 α2-adrenoceptors agonist (clonidine) or antagonist (yohimbine) microinjections.
Results: Pre-test administration of morphine (6 mg/kg) showed an anxiolytic-like response. The extension of this effect during the retest session, 24h later, indicated impairment of aversive memory. Pre-test microinjection of clonidine (4 µg/rat) induced anxiolytic-like behavior on the test day in the absence or presence of a subthreshold dose of morphine (4 mg/kg) and increased avoidance to the open-arms during the retest session, but it was not significant compared with control group. Pre-test microinjection of yohimbine (4 µg/rat) induced an anxiogenic-like behavior on test day in the absence or presence of an effective dose of morphine (6mg/kg) and increased avoidance to the open-arms during the retest session. Concurrent microinjection of a subthreshold dose of yohimbine (1 μg/rat) with an effective dose of clonidine or with an effective dose of clonidine plus a subthreshold dose of morphine blocked anxiolytic-like behaviors, but did not change avoidance to the open-arms.
Conclusion: According to our findings, it appears that CA1 α2-adrenoceptors affect anxiolytic-like effects of morphine, but they do not appear to play a significant role in the morphine-induced memory impairment.
Methods: This assessment was conducted in rats using the elevated plus-maze test based on a test-retest paradigm. Bilateral guide cannulas were stereotaxically implanted in the CA1 regions of rats to allow intra-CA1 α2-adrenoceptors agonist (clonidine) or antagonist (yohimbine) microinjections.
Results: Pre-test administration of morphine (6 mg/kg) showed an anxiolytic-like response. The extension of this effect during the retest session, 24h later, indicated impairment of aversive memory. Pre-test microinjection of clonidine (4 µg/rat) induced anxiolytic-like behavior on the test day in the absence or presence of a subthreshold dose of morphine (4 mg/kg) and increased avoidance to the open-arms during the retest session, but it was not significant compared with control group. Pre-test microinjection of yohimbine (4 µg/rat) induced an anxiogenic-like behavior on test day in the absence or presence of an effective dose of morphine (6mg/kg) and increased avoidance to the open-arms during the retest session. Concurrent microinjection of a subthreshold dose of yohimbine (1 μg/rat) with an effective dose of clonidine or with an effective dose of clonidine plus a subthreshold dose of morphine blocked anxiolytic-like behaviors, but did not change avoidance to the open-arms.
Conclusion: According to our findings, it appears that CA1 α2-adrenoceptors affect anxiolytic-like effects of morphine, but they do not appear to play a significant role in the morphine-induced memory impairment.
Article number: 9
Type of Manuscript: Experimental research article |
Subject:
Neurophysiology/Pharmacology
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