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Inhibition of orexin-1/hypocretin-1 receptors inhibits yohimbine-induced reinstatement of ethanol and sucrose seeking in Long-Evans rats

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Richards, Jemma K., Simms, Jeffrey A., Steensland, Pia, Taha, Sharif A., Borgland, Stephanie L., Bonci, Antonello, Bartlett, Selena E.·2008·Psychopharmacology

Abstract

RATIONALE: Previous studies have shown that orexin-1/hypocretin-1 receptors play a role in self-administration and cue-induced reinstatement of food, drug, and ethanol seeking. In the current study, we examined the role of orexin-1/hypocretin-1 receptors in operant self-administration of ethanol and sucrose and in yohimbine-induced reinstatement of ethanol and sucrose seeking. MATERIALS AND METHODS: Rats were trained to self-administer either 10% ethanol or 5% sucrose (30 min/day). The orexin-1 receptor antagonist SB334867 (0, 5, 10, 15, 20 mg/kg, i.p.) was administered 30 min before the operant self-administration sessions. After these experiments, the operant self-administration behaviors were extinguished in both the ethanol and sucrose-trained rats. Upon reaching extinction criteria, SB334867 (0, 5, 10 mg/kg, i.p.) was administered 30 min before yohimbine (0 or 2 mg/kg, i.p.). In a separate experiment, the effect of SB334867 (0, 15, or 20 mg/kg, i.p.) on general locomotor activity was determined using the open-field test. RESULTS: The orexin-1 receptor antagonist, SB334867 (10, 15 and 20 mg/kg) decreased operant self-administration of 10% ethanol but not 5% sucrose self-administration. Furthermore, SB334867 (5 and 10 mg/kg) significantly decreased yohimbine-induced reinstatement of both ethanol and sucrose seeking. SB334867 did not significantly affect locomotor activity measured using the open-field test. CONCLUSIONS: The results suggest that inhibition of OX-1/Hcrt-1 receptors modulates operant ethanol self-administration and also plays a significant role in yohimbine-induced reinstatement of both ethanol and sucrose seeking in rats.

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  1. Bremner JD Krystal JH Southwick SM Charney DS Noradrenergic mechanisms in stress and anxiety: II. Clinical studies Synapse 1996 23 39 51 10.1002/(SICI)1098-2396(199605)23:1<39::AID-SYN5>3.0.CO;2-I 8723134 Bremner JD, Krystal JH, Southwick SM, Charney DS (1996b) Noradrenergic mechanisms in stress and anxiety: II. Clinical studies. Synapse 23:39–51 8723134 · DOI

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Authors
Richards, J. K., Simms, J. A., Steensland, P., Taha, S. A., Borgland, S. L., Bonci, A., & Bartlett, S. E.
Affiliations
University of California, San Francisco (US)
Corresponding author
Bartlett, Selena E.
Venue
Psychopharmacology
Published
2008-05-10
Volume
199
Issue
1
Pages
109-117
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W2164595661
Cited by
234
References
56
Citations by year
2026: 5 · 2025: 9 · 2024: 5 · 2023: 6 · 2022: 8 · 2021: 6 · 2020: 5 · 2019: 9 · 2018: 12 · 2017: 9 · 2016: 13 · 2015: 15 · 2014: 23 · 2013: 17 · 2012: 26
FWCI
9.52
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Psychopharmacology (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Defense (W81XWH)
  • National Alliance for Research on Schizophrenia and Depression
  • National Institutes of Health (W81XWH)
  • University of California, San Francisco
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
Keywords
orexin-1 receptor, SB-334867, yohimbine, ethanol self-administration, sucrose self-administration, reinstatement, locomotor activity, Long-Evans rats
MeSH terms
Adrenergic alpha-Antagonists, Alcoholism, Animals, Benzoxazoles, Conditioning, Operant, Dose-Response Relationship, Drug, Extinction, Psychological, Male, Motivation, Motor Activity, Naphthyridines, Self Administration, Sucrose, Taste, Urea, Yohimbine, Receptors, Neuropeptide, Rats, Long-Evans, Receptors, G-Protein-Coupled, Rats, Orexin Receptors

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