Kappa-opioid receptors and relapse-like drinking in long-term ethanol-experienced rats.
paper
Cited
Public
Unavailable
- Authors
- HΓΆlter, S M; Henniger, M S; Lipkowski, A W; Spanagel, R
- Year
- 2000
- Journal
- Psychopharmacology
- PMID
- 11255932
- DOI
- 10.1007/s002130000601
RATIONALE: The role of the dynorphin/kappa-opioid receptor system in ethanol reinforcement is unclear. OBJECTIVE: Examination of the effects of the highly selective kappa-opioid receptor agonist CI-977 (enadoline) and of the long-acting selective kappa-opioid receptor antagonist nor-binaltorphimine (nor-BNI) on relapse-like drinking measured by the alcohol deprivation effect (ADE) in long-term ethanol-experienced rats. METHODS: Rats were either implanted with mini-osmotic pumps delivering 0 or 0.01 mg/kg per h CI-977 or received two injections (12 h apart) of nor-BNI (0 or 5 mg/kg i.p.) before representation of alcohol after 2 weeks of alcohol deprivation in a four-bottle home cage drinking paradigm. In a second experiment, long-term ethanol-experienced rats trained in an operant ethanol self-administration paradigm received either acute CI-977 treatment (0, 0.003-0.1 mg/kg i.p.) or two injections (12 h apart) of nor-BNI (0 or 5 mg/kg i.p.) before a 23-h session. RESULTS: Chronic CI-977 potentiated ethanol intake and preference during the ADE. Acute CI-977 dose-dependently reduced total lever pressing activity demonstrating an unspecific sedative effect, except for the lowest dose (0.003 mg/kg), which selectively increased lever pressing for ethanol during basal drinking. Nor-BNI did not affect relapse-like drinking at all. CONCLUSIONS: Stimulation of kappa-opioid receptors can increase ethanol intake, at least in long-term ethanol-experienced rats. Since kappa-opioid receptor agonists have aversive motivational consequences, increased ethanol drinking might be an attempt to counteract the aversive effects of this treatment. On the other hand, the nor-BNI experiments indicate that endogenous kappa-opioid receptor stimulation does not seem to be involved in relapse-like drinking after protracted abstinence.
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