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- W2079585344 abstract "The aim of the present study was to investigate the role of different endogenous opioid systems in the expression of ethanol's discriminative stimulus effects in a two-lever operant drug discrimination paradigm. Wistar rats trained to make differential responses following the administration of ethanol (1 g/kg, i.p.) or saline. The correct response (fixed-ratio schedule; FR10) resulted in the presentation of food. Once rats had acquired the discrimination an ethanol dose-response test was conducted. The effects of opioid antagonists on the discrimination were assessed by administering the mu-opioid receptor antagonists naloxone (0.5-20 mg/kg s.c.) and cyprodime (5-100 mg/kg s.c.) and the delta-opioid receptor antagonist naltrindole (0.1-25 mg/kg s.c.) 15-30 min before the discrimination test. Furthermore, the selective kappa-opioid antagonist nor-binaltorphimine (5 mg/kg s.c.) given 24 h before the test session was examined. Results of generalization testing demonstrate that ethanol discrimination was dose dependent. Pretreatment with naloxone produced only at the highest dose a partial, but significant, antagonism, whereas cyprodime failed to alter the ethanol cue. This suggested the involvement of other opioid receptor subtypes. However, neither naltrindole nor nor-binaltorphimine had any effect on the ethanol-saline discrimination. These results demonstrate that the expression of the ethanol cue is only partly dependent on the function of endogenous opioid systems." @default.
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- W2079585344 date "1996-08-01" @default.
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- W2079585344 title "The influence of opioid antagonists on the discriminative stimulus effects of ethanol" @default.
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- W2079585344 doi "https://doi.org/10.1016/0091-3057(95)02288-0" @default.
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