Preference for a cocaine-associated environment is attenuated by augmented accumbal serotonin in cocaine withdrawn rats |
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Authors: | Harris G C Altomare K Aston-Jones G |
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Affiliation: | Department of Psychiatry, University of Pennsylvania, VAMC, Philadelphia 19104, USA. |
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Abstract: | RATIONALE: Recent studies have found decreased serotonin (5-HT) transmission within the nucleus accumbens following withdrawal from chronic cocaine. OBJECTIVE: We sought to investigate whether increasing brain 5-HT levels would decrease behavioral responses that occur following cocaine withdrawal, namely increased preference for a cocaine environment and anxiety. METHODS: The conditioned place preference and the defensive burying paradigms were used to measure the behavioral responses that occur 1 week following cocaine withdrawal. RESULTS: We show that pharmacological agents that increase 5-HT transmission (sertraline or 5-hydoxytryptophan, 5-HTP) abolish the preference of subchronically cocaine-treated, abstinent rats for a cocaine-associated environment. Similar results were seen when sertraline was microinjected into the nucleus accumbens. Conversely, rats acutely conditioned with cocaine showed an increased preference for a cocaine-associated environment when pretreated with these drugs. Sertraline also decreased the heightened anxiety-like behaviors found in subchronically treated cocaine rats. CONCLUSIONS: These results indicate that drugs that augment 5-HT function may reduce the desire for cocaine following cocaine withdrawal, and thus facilitate cocaine abstinence in dependent subjects. |
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Keywords: | Serotonin Sertraline 5-HTP Cocaine Withdrawal Place conditioning |
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