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• W1497437537 abstract "Rationale: It has been reported that passive administration of nicotine increases preferentially extra- cellular dopamine (DA) release in the shell as compared to that in the core of the nucleus accumbens (NAc). To date, no information is available if this also applies to active, response-contingent nicotine administration. Objective: This studywas aimed to monitorthechanges ofextracellularDAin the NAc shell and core during activeintravenous nicotine self- administration(SA). Methods: Ratswerebilaterallyimplant- ed with chronic cannulae and were trained to self-administer nicotine (0.03 mg/kg, i.v.) in single daily 1-h session for 6 weeks, with an initial fixed ratio (FR) 1 schedule increased to FR 2. Dialysate DA from the NAc shell and core was monitored before and for 90 min after the start of SA. Results: Significant increases of active nose-pokes over in- active ones were found starting from the 16th SA session. No differences were found in basal extracellular DA in the NAc subdivisions. Data analysis showed (1) significant increases over basal of dialysate DA in the NAc subdivisions during nicotine SA, starting from the first week in the shell and from the second week in the core, (2) preferential increase of extracellular DA during nicotine SA in the shell (24-43%) compared to that in the core (10-23%) and (3) no change in dialysate DA in NAc subdivisions during extinction. Conclusions: Response-contingent nicotine SA preferen- tially increases the DA output in the NAc shell as compared to that in the core, independently from the duration of the nicotine exposure. Increase in NAc DA is strictly related to nicotine action since is not observed during extinction in spite of active responding." @default.
• W1497437537 created "2016-06-24" @default.
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• W1497437537 date "2006-01-01" @default.
• W1497437537 modified "2023-09-26" @default.
• W1497437537 title "Preferential increase of extracellular dopamine in the rat nucleus accumbens shell as compared to that in the core during acquisition and maintenance of intravenous nicotine" @default.
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• W1497437537 hasPublicationYear "2006" @default.
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