Discriminative properties of l-cathinone compared to dl- and d-cathinone.
Rats were trained to discriminate between the stimulus properties of 0.6 mg/kg l-cathinone and its vehicle in a two-lever, food-motivated operant task. Once trained, rats showed a dose-dependent decrease in discrimination performance with lower l-cathinone doses and analysis of the dose-response relationship indicated an ED50 of 0.19 mg/kg. Administration of either dl-or d-cathinone produced a pattern of discriminative responding similar to l-cathinone with ED50s of 0.29 and 0.63 mg/kg, respectively. Thus, the potency of the racemeric cathinone lies approximately midway between that of the two isomers. Time-course data indicate that l-cathinone has a peak effect at 15-30 min post-administration with a duration of 180 min. Pretreatment with the serotonic receptor blocker pirenperone did not affect l-cathinone discrimination, whereas pretreatment with 0.2 mg/kg haloperidol, a dopamine receptor blocking agent, attenuated the l-cathinone discrimination. These data suggest that the stimulus properties of l-cathinone are possibly mediated by brain dopaminergic systems.
D000470:Alkaloids / Q000494:pharmacology*; D000818:Animals; D004192:Discrimination, Psychological / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005793:Generalization, Psychological / Q000187:drug effects; D006220:Haloperidol / Q000494:pharmacology; D008297:Male; D010880:Piperidines / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013237:Stereoisomerism; D013997:Time Factors
D000470:Alkaloids; D010880:Piperidines; C023665:cathinone; D006220:Haloperidol; C034177:pirenperone