Effect of baclofen on morphine-induced conditioned place preference, extinction, and stress-induced reinstatement in chronically stressed mice |
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Authors: | Shanshan Meng Wuxing Quan Xu Qi Zhiqiang Su Shanshan Yang |
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Institution: | 1. Daqiao Branch Institute, the First Affiliated Hospital of Harbin Medical University, Harbin, 150076, China 2. Emergency Department, the Second RENMIN Hospital of Mudanjiang, Mudanjiang, China 3. Department of Neurology, the First Affiliated Hospital of Harbin Medical University, Harbin, 150001, China
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Abstract: | Rationale and Objective A stress-induced increase in excitability can result from a reduction in inhibitory neurotransmission. Modulation of gamma-aminobutyric acid (GABA)ergic transmission is an effective treatment for drug seeking and relapse. This study investigated whether baclofen, a GABAB receptor agonist, had an impact on morphine-induced conditioned place preference (CPP), extinction, and stress-induced relapse in chronically stressed mice. Methods Chronic stress was induced by restraining mice for 2 h for seven consecutive days. We first investigated whether chronic stress influenced morphine-induced CPP, extinction, and stress-induced relapse in the stressed mice. Next, we investigated whether three different doses of baclofen influenced chronic stress as measured by the expression of morphine-induced CPP. We chose the most effective dose for subsequent extinction and reinstatement experiments. Reinstatement of morphine-induced CPP was induced by a 6-min forced swim stress. Locomotor activity was also measured for each test. Results Chronic stress facilitated the expression of morphine-induced CPP and prolonged extinction time. Forced swim stress primed the reinstatement of morphine-induced CPP in mice. Baclofen treatment affected the impact of chronic stress on different phases of morphine-induced CPP. Conclusions Our results showed that baclofen antagonized the effects of chronic stress on morphine-induced CPP. These findings suggest the potential clinical utility of GABAB receptor-positive modulators as an anti-addiction agent in people suffering from chronic stress. |
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