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• W2004451864 abstract "Extinction of drug-seeking is an integral part of addiction treatment, and can profoundly reverse or ameliorate the harmful consequences of drug use. These consequences may be the most deleterious during adolescence. The studies presented here build from recent evidence that adolescent rats are more resistant to extinction training than adults, and therefore may require unique treatment strategies. We used unbiased place-conditioning in male rats to show that passive, un-explicit extinction pairings resulted in delayed extinction in 40-day-old adolescents relative to 80-day-old adults. However, explicit-pairing of a previously cocaine-associated context with the absence of drug produces extinction in adolescents as rapidly as in adults. These data suggest that successful extinction of drug-paired associations in adolescents may be facilitated by stronger acquisition of a new (extinction) memory. Drug-paired associations are largely controlled by the prelimbic prefrontal cortex (plPFC) and its influence on the nucleus accumbens (NAc). This pathway mediates the motivational salience attributed to incoming stimuli through the D1 dopamine receptor. D1 receptors on plPFC outputs to the accumbens are transiently overproduced during adolescence. Since D1 receptors are selectively responsive to potent stimuli, we hypothesized that the adolescent plPFC hinders competition between potent drug-paired associations and the subtler, drug-free information necessary for extinction. To harness this unique profile of the adolescent plPFC, we aimed to increase the salience of unrewarded extinction memories by activating plPFC D1 receptors during extinction training. In a second study, extinction of drug-cue associations was facilitated in adolescents by elevating dopamine and norepinephrine in the PFC during extinction training with atomoxetine. In a third study, direct microinjection of the D1 receptor agonist SKF38393 mimicked this effect, also facilitating extinction in adolescent subjects. Furthermore, pharmacological intervention attenuated subsequent drug-primed reinstatement of cocaine-conditioned preferences. We establish a potential direction for distinct strategies to treat this vulnerable population." @default.
• W2004451864 created "2016-06-24" @default.
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• W2004451864 date "2010-08-01" @default.
• W2004451864 modified "2023-10-14" @default.
• W2004451864 title "Enhancing the salience of dullness: behavioral and pharmacological strategies to facilitate extinction of drug-cue associations in adolescent rats" @default.
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• W2004451864 doi "https://doi.org/10.1016/j.neuroscience.2010.05.063" @default.
• W2004451864 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2907356" @default.
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