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.
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 cocainerats. 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.
Authors: Abigail G Schindler; Daniel I Messinger; Jeffrey S Smith; Haripriya Shankar; Richard M Gustin; Selena S Schattauer; Julia C Lemos; Nicholas W Chavkin; Catherine E Hagan; John F Neumaier; Charles Chavkin Journal: J Neurosci Date: 2012-12-05 Impact factor: 6.167
Authors: Gary Aston-Jones; Rachel J Smith; Gregory C Sartor; David E Moorman; Lema Massi; Pouya Tahsili-Fahadan; Kimberlei A Richardson Journal: Brain Res Date: 2009-10-06 Impact factor: 3.252