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Repeated cycles of ethanol intoxication and withdrawal associated with dependence induce neuroadaptations in a variety of brain systems. Withdrawal-induced negative emotional states can be ameliorated by ethanol consumption; a learned process termed negative reinforcement. Accordingly, a dependence-induced phenotype is escalated ethanol self-administration. Matrix metalloproteinases (MMPs) are proteolytic...
Previously, it was shown that ethanol-dependent animals display increased sensitivity to the general opioid receptor antagonist nalmefene compared to naltrexone. It was hypothesized that the dissociable effects of the two antagonists were attributable to a κ-opioid receptor mechanism. Nucleus accumbens dynorphin is upregulated following chronic ethanol exposure and such neuroadaptations could contribute...
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