Regulation of drug-taking and -seeking behaviors by neuroadaptations in the mesolimbic dopamine system - PubMed (original) (raw)
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Regulation of drug-taking and -seeking behaviors by neuroadaptations in the mesolimbic dopamine system
David W Self. Neuropharmacology. 2004.
Abstract
Previous studies have identified several neuroadaptations to chronic drug use, but relatively few have been functionally linked to addiction-related changes in drug-taking and -seeking behaviors. This article summarizes our past and present studies on the contribution of drug-induced neuroadaptations in the mesolimbic dopamine system to addiction-related changes in drug self-administration and the propensity for relapse in drug withdrawal. Our studies suggest that drug-induced up-regulation in cyclic AMP (cAMP)-protein kinase A (PKA) signaling in the nucleus accumbens (NAc) contributes to escalating drug intake and a propensity for relapse by differentially altering the sensitivity of D1 and D2 dopamine receptors that regulate drug-taking and -seeking behaviors. In addition, our studies suggest that drug-induced neuroplasticity at excitatory synapses in both the ventral tegmental area (VTA) and the NAc also facilitates drug-seeking behavior and the propensity for relapse. Finally, the role of both transient and enduring neuroadaptations in regulating drug-seeking behavior is discussed in view of different learning- and memory-based interactions.
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