Cited by 101Neurotransmitter Receptor Influence on BehaviorSleep and Wakefulness ResearchRegulation of Appetite and Obesity

Central orexin (hypocretin) 2 receptor antagonism reduces ethanol self-administration, but not cue-conditioned ethanol-seeking, in ethanol-preferring rats

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Brown, Robyn Mary, Khoo, Shaun Yon-Seng, Lawrence, Andrew John·2013·International Journal of Neuropsychopharmacology

Abstract

Orexins are hypothalamic neuropeptides which bind to two G-protein-coupled receptors, orexin-1 (OX(1)R) and orexin-2 (OX(2)R) receptor. While a role for OX(1)R has been established in both ethanol reinforcement and ethanol-seeking behaviour, the role of OX(2)R in these behaviours is relatively less-studied. The aim of this study was to determine the role of central OX(2)R in ethanol-taking and ethanol-seeking behaviour. Indiana ethanol-preferring rats were trained to self-administer ethanol (10% w/v) or sucrose (0.7–1% w/v) in the presence of reward-associated cues before being implanted with indwelling guide cannulae. The selective OX(2)R antagonist TCS-OX2-29 was administered i.c.v. to assess its effect on operant self-administration and cue-induced reinstatement following extinction. Following i.c.v. injection TCS-OX2-29 reduced self-administration of ethanol, but not sucrose. Despite reducing ethanol self-administration, TCS-OX2-29 had no impact on cue-induced reinstatement of ethanol seeking. To determine where in the brain OX(2)R were acting to modulate ethanol self-administration, TCS-OX2-29 was microinjected into either the shell or core of the nucleus accumbens (NAc). Intra-NAc core, but not shell, infusions of TCS-OX2-29 decreased responding for ethanol. Importantly, the doses of TCS-OX2-029 used were non-sedating. Collectively, these findings implicate OX(2)R in the NAc in mediating the reinforcing effects of ethanol. This effect appears to be drug-specific as antagonism of central OX(2)R had no impact on sucrose self-administration. Thus, OX(2)R in addition to OX(1)R may represent a potential therapeutic target for the treatment of ethanol-use disorders. However, unlike OX(1)R, no impact of OX(2)R antagonism was observed on cue-induced reinstatement, suggesting a more prominent role for OX(2)R in ethanol self-administration compared to cue-conditioned ethanol-seeking.

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Authors
Brown, R. M., Khoo, S. Y.-S., & Lawrence, A. J.
Affiliations
  • Medical University of South Carolina (US)
  • The University of Melbourne (AU)
Corresponding author
Lawrence, Andrew John
Venue
International Journal of Neuropsychopharmacology
Published
2013-10-01
Volume
16
Issue
9
Pages
2067-2079
ISSN
  • 1461-1457 (ISSN-L)
  • 1469-5111
OpenAlex
W1987854393
Cited by
101
References
75
Citations by year
2026: 3 · 2025: 9 · 2024: 6 · 2023: 2 · 2022: 5 · 2021: 10 · 2020: 8 · 2019: 9 · 2018: 10 · 2017: 6 · 2016: 12 · 2015: 10 · 2014: 10 · 2013: 1
FWCI
5.40
Type
journal article
Language
en
Open access
Locations
  • The International Journal of Neuropsychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion)
Funders
  • State Government of Victoria
  • Medical Research Council
  • National Health and Medical Research Council (1021227)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
orexin receptor 2, TCS OX2 29, ethanol self-administration, ethanol seeking, cue-induced reinstatement, nucleus accumbens, nucleus accumbens shell, nucleus accumbens core, ethanol reinforcement, sucrose self-administration, alcoholism, G protein-coupled receptors
MeSH terms
Orexin Receptor Antagonists, Alcohol Drinking, Ethanol, Animals, Behavior, Animal, Brain, Conditioning, Psychological, Cues, Isoquinolines, Male, Motor Activity, Pyridines, Reward, Self Administration, Sucrose, Rats, Drug-Seeking Behavior, Orexin Receptors

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