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Neurosci."],"published-print":{"date-parts":[[2008,12,3]]},"abstract":"<jats:p>Cue-induced drug-seeking in rodents progressively increases after withdrawal from operant self-administration of cocaine, heroin, methamphetamine, and alcohol, a phenomenon termed \u201cincubation of drug craving.\u201d Here, we used the opiate drug morphine and explored whether incubation of drug craving also occurs in a pavlovian conditioned place preference (CPP) procedure in which rats learn to associate drug effects with a distinct environmental context. We also explored the role of amygdala extracellular signal-regulated kinase (ERK) and cAMP response element-binding protein (CREB) in this incubation. We found that the expression of morphine CPP progressively increases over the first 14 d after the last drug exposure in rats receiving four pairings of low-dose (1 or 3 mg\/kg) but not high-dose (10 mg\/kg) morphine with a distinct environment. The progressive increase in low-dose (3 mg\/kg) morphine CPP was associated with increased ERK phosphorylation (a measure of ERK activity) and CREB (a downstream target of ERK) phosphorylation in central but not basolateral amygdala. Furthermore, inhibition of central but not basolateral amygdala ERK and CREB phosphorylation by U0126 [1,4-diamino-2,3-dicyano-1,4-bis(<jats:italic>o<\/jats:italic>-aminophenylmercapto)butadiene] decreased the enhanced (incubated) drug CPP after 14 d of withdrawal from morphine. Finally, stimulation of central amygdala ERK and CREB phosphorylation by NMDA enhanced drug CPP after 1 d of withdrawal from morphine, an effect reversed by U0126. These findings indicate that the rat's response to environmental cues previously paired with morphine progressively increases or incubates over the first 14 d of withdrawal from low but not high morphine doses. Additionally, this \u201cincubation of morphine craving\u201d is mediated by acute activation of central amygdala ERK pathway.<\/jats:p>","DOI":"10.1523\/jneurosci.3027-08.2008","type":"journal-article","created":{"date-parts":[[2008,12,3]],"date-time":"2008-12-03T20:16:24Z","timestamp":1228335384000},"page":"13248-13257","source":"Crossref","is-referenced-by-count":134,"title":["Central Amygdala Extracellular Signal-Regulated Kinase Signaling Pathway Is Critical to Incubation of Opiate 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