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.
Original language | English (US) |
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Pages (from-to) | 242-255 |
Number of pages | 14 |
Journal | Neuropharmacology |
Volume | 47 |
Issue number | SUPPL. 1 |
DOIs | |
State | Published - 2004 |
Keywords
- Cocaine
- Dopamine receptors
- Heroin
- Nucleus accumbens
- Ventral tegmental area
- α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) glutamate receptors
ASJC Scopus subject areas
- Pharmacology
- Cellular and Molecular Neuroscience