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Journal article
Kappa-opioid receptor-dependent changes in dopamine and anxiety-like or approach-avoidance behavior occur differentially across the nucleus accumbens shell rostro-caudal axis
Neuropharmacology, v 181, pp 108341-108341
15 Dec 2020
PMID: 33011200
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Neural circuit engagement within the nucleus accumbens (NAc) shell is implicated in the regulation of both negative and positive affect. Classically, the dynorphin/kappa opioid receptor (KOR) system in the NAc was believed to promote aversion, while dopamine was viewed as interacting with reward behavior, and KOR activation was known to inhibit dopamine release. Recently, however, both the KOR and dopamine systems have, separately, been shown to have differential effects across the rostro-caudal axis of the NAc shell on hedonic responses. Whether or not this is due to interactions between KORs and dopamine, and if it extends to anxiety -like or approach-avoidance behaviors, remains to be determined. In this study, we examined in rats the relationship between the KOR and dopamine systems in both the rostral and caudal NAc shell using ex vivo fast scan cyclic voltammetry and the impact of KOR activation on affective behavior using exploration-based tasks. We report here that activation of KORs in the caudal NAc shell significantly inhibits dopamine release, stimulates rearing behavior in a novel environment, increases anxiety-like or avoidance behavior, and reduces locomotor activity. In contrast, activation of KORs in the rostral NAc shell inhibits dopamine release to a lesser extent and instead reduces anxiety-like behavior or increases approach behavior. Taken together, these results indicate that there is heterogeneity across the rostro-caudal axis of the NAc shell in the effects of KOR stimulation on affective behaviors, and they suggest that this might be due to differences in KOR control over dopamine release.
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Details
- Title
- Kappa-opioid receptor-dependent changes in dopamine and anxiety-like or approach-avoidance behavior occur differentially across the nucleus accumbens shell rostro-caudal axis
- Creators
- Breanne E. Pirino - Drexel UniversityMary B. Spodnick - Binghamton UniversityAndrew T. Gargiulo - Drexel UniversityGenevieve R. Curtis - Drexel UniversityJessica R. Barson - Drexel UniversityAnushree N. Karkhanis - Binghamton University
- Publication Details
- Neuropharmacology, v 181, pp 108341-108341
- Publisher
- Elsevier
- Number of pages
- 10
- Grant note
- K01AA023874; R01AA028218; R00AA021782 / National Institute on Alcohol Abuse and Alcoholism; United States Department of Health & Human Services; National Institutes of Health (NIH) - USA; NIH National Institute on Alcohol Abuse & Alcoholism (NIAAA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy
- Web of Science ID
- WOS:000587632100005
- Scopus ID
- 2-s2.0-85091892159
- Other Identifier
- 991019168979104721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Neurosciences
- Pharmacology & Pharmacy