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- W2051250857 abstract "Although imidazoline I2 receptor ligands have been used as discriminative stimuli, the role of efficacy of I2 receptor ligands as a critical determinant in drug discrimination has not been explored. This study characterized the discriminative stimulus effects of selective imidazoline I2 receptor ligands BU224 (a low-efficacy I2 receptor ligand) and phenyzoline (a higher efficacy I2 receptor ligand) in rats. Two groups of male Sprague–Dawley rats were trained to discriminate 5.6 mg/kg BU224 or 32 mg/kg phenyzoline (i.p.) from their vehicle in a two-lever food-reinforced drug discrimination procedure, respectively. All rats acquired the discriminations after an average of 18 (BU224) and 56 (phenyzoline) training sessions, respectively. BU224 and phenyzoline completely substituted for one another symmetrically. Several I2 receptor ligands (tracizoline, CR4056, RS45041, and idazoxan) all occasioned>80% drug-associated lever responding in both discriminations. The I2 receptor ligand 2-BFI and a monoamine oxidase inhibitor harmane occasioned>80% drug-associated lever responding in rats discriminating BU224. Other drugs that occasioned partial or less substitution to BU224 cue included clonidine, methamphetamine, ketamine, morphine, methadone and agmatine. Clonidine, methamphetamine and morphine also only produced partial substitution to phenyzoline cue. Naltrexone, dopamine D2 receptor antagonist haloperidol and serotonin (5-HT)2A receptor antagonist MDL100907 failed to alter the discriminative stimulus effects of BU224 or phenyzoline. Combined, these results are the first to demonstrate that BU224 and phenyzoline can serve as discriminative stimuli and that the low-efficacy I2 receptor ligand BU224 shares similar discriminative stimulus effects with higher-efficacy I2 receptor ligands such as phenyzoline and 2-BFI." @default.
- W2051250857 created "2016-06-24" @default.
- W2051250857 creator A5007550740 @default.
- W2051250857 creator A5060955235 @default.
- W2051250857 creator A5073508266 @default.
- W2051250857 date "2015-02-01" @default.
- W2051250857 modified "2023-10-08" @default.
- W2051250857 title "Discriminative stimulus effects of the imidazoline I2 receptor ligands BU224 and phenyzoline in rats" @default.
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- W2051250857 doi "https://doi.org/10.1016/j.ejphar.2015.01.013" @default.
- W2051250857 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4331254" @default.
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