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HERO ID
1454255
Reference Type
Journal Article
Title
Dopaminergic and GABA-ergic markers of impulsivity in rats: evidence for anatomical localisation in ventral striatum and prefrontal cortex
Author(s)
Jupp, B; Caprioli, D; Saigal, N; Reverte, I; Shrestha, S; Cumming, P; Everitt, BJ; Robbins, TW; Dalley, JW
Year
2013
Is Peer Reviewed?
Yes
Journal
European Journal of Neuroscience
ISSN:
0953-816X
EISSN:
1460-9568
Volume
37
Issue
9
Page Numbers
1519-1528
Language
English
PMID
23368520
DOI
10.1111/ejn.12146
Web of Science Id
WOS:000318444700016
Abstract
Accumulating evidence indicates that impulsivity, in its multiple forms, involves cortical and subcortical mechanisms and abnormal dopamine (DA) transmission. Although decreased DA D2/D3 receptor availability in the nucleus accumbens (NAcb) predicts trait-like impulsivity in rats it is unclear whether this neurochemical marker extends to both the NAcb core (NAcbC) and shell (NAcbS) and whether markers for other neurotransmitter systems implicated in impulsivity such as serotonin (5-HT), endogenous opioids and γ-amino-butyric acid (GABA) are likewise altered in impulsive rats. We therefore used autoradiography to investigate DA transporter (DAT), 5-HT transporter (5-HTT) and D1, D2/D3, μ-opioid and GABA(A) receptor binding in selected regions of the prefrontal cortex and striatum in rats expressing low and high impulsive behaviour on the five-choice serial reaction-time task. High-impulsive (HI) rats exhibited significantly lower binding for DAT and D2/D3 receptors in the NAcbS and for D1 receptors in the NAcbC compared with low-impulsive (LI) rats. HI rats also showed significantly lower GABA(A) receptor binding in the anterior cingulate cortex. For all regions where receptor binding was altered in HI rats, binding was inversely correlated with impulsive responding on task. There were no significant differences in binding for 5-HTT or μ-opioid receptors in any of the regions investigated. These results indicate that altered D2/D3 receptor binding is localised to the NAcbS of trait-like impulsive rats and is accompanied by reduced binding for DAT. Alterations in binding for D1 receptors in the NAcbC and GABA(A) receptors in the anterior cingulate cortex demonstrate additional markers and putative mechanisms underlying the expression of behavioural impulsivity.
Keywords
autoradiography; dopamine; GABA; nucleus accumbens; opioid; serotonin
Tags
IRIS
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n-Butanol
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Pubmed
WOS
Source – January 2013 (private)
Pubmed - 1/2013
Merged reference set - 1/2013
Database Searches - March 2014 (private)
WOS – 3/2014
Excluded (not pertinent)
Not chemical specific
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