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The Journal of Neuroscience, July 28, 2004, 24(30):6686-6692; doi:10.1523/JNEUROSCI.1706-04.2004

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Behavioral/Systems/Cognitive
cAMP Response Element-Binding Protein Is Required for Stress But Not Cocaine-Induced Reinstatement

Arati S. Kreibich and Julie A. Blendy

Department of Pharmacology, University of Pennsylvania, Philadelphia, Pennsylvania 19104

Reinstatement of previously extinguished conditioned place preference (CPP) is precipitated by stress or drug exposure. Here, we show that acute exposure to forced swim stress (FS), in a context distinct from conditioning, induces reinstatement of cocaine CPP in wild-type mice. This behavior is accompanied by a pattern of phosphorylated cAMP response element-binding protein (pCREB) activation in discrete brain regions that is distinct from the pattern observed after cocaine-induced reinstatement. For example, previous cocaine conditioning increases pCREB levels in the amygdala, and acute exposure to FS, but not to cocaine, further augments these changes. In contrast, previous cocaine conditioning does not alter levels of pCREB in the nucleus accumbens, but acute exposure to FS increases pCREB levels in this region on reinstatement day. Furthermore, to determine whether these alterations of CREB are necessary in FS or cocaine-induced reinstatement, we examined the effect of these stimuli on reinstatement behavior in mice deficient in and isoforms of CREB. The CREB mutant mice show deficits in FS-induced reinstatement of conditioned place preference. In contrast, they show robust cocaine-induced reinstatement. This deficit in stress but not drug-induced reinstatement indicates a specific requirement for CREB in stress-induced behavioral responses to drugs of abuse.

Key words: CREB; FS; reinstatement; RI; conditioned place preference; CPP; cocaine; stress

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Received May 4, 2004; revised June 9, 2004; accepted June 14, 2004.

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