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Intravenous self-injection of four novel phenethylamines in baboons

Christine A. Sannerud, B. Kaminski, Roland R. Griffiths

Behavioural Pharmacology August 1, 1996 DOI: 10.1097/00008877-199608000-00002 (opens in new tab)

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Study at a glance

AI-extracted from the abstract
Characteristics Preclinical experimental study Peer reviewed
Population Baboons
Interventions MDE N-OH-MDA NNDMA BDMPEA
Dose 0.32 mg/kg/injection cocaine (training dose); doses of test compounds not specified in abstract
Duration 15 or more successive days of substitution for cocaine
Topics Serotonin
Keywords Phenethylamines Self-administration Pharmacology Amphetamine Phencyclidine Fenfluramine Decussation Toxicity Anesthesia Dopamine
Citations 9
Key findings High doses of MDE and N-OH-MDA maintained self-injection in baboons, while NNDMA did not reliably do so, and BDMPEA maintained self-injection in each of three baboons at one or more doses.

Abstract

The present study evaluated the intravenous self-administration of four substituted phenethylamines, using a substitution procedure in baboons. Baboons were trained to self-inject 0.32mg/kg/injection cocaine under a fixed-ration (FR) schedule, with a 3h timeout following each injection. Doses of (+/-)-N-ethyl-3, 4-methylenedioxyamphetamine HCI (MDE), (+/-)-N-hydroxy-3, 4-methylendioxyamphetamine HCI (N-OH-MDA), (+)-N-N-dimethylamphetamine HCI (NNDMA), and 4-bromo-2,5-dimethyoxy-beta-phenethylamine (BDMPEA) and their vehicles were substituted for cocaine for 15 or more successive days. High doses of MDE and N-OH-MDA maintained self-injection; however, NNDMA and BDMPEA self-injection was less consistent. NNDMA did not reliably maintain self-injection, whereas one or more doses of BDMPEA maintained self-injection in each of three baboons. Intermediate to high doses of all four compounds decreased food pellet intake maintained under a FR schedule of reinforcement on a different lever. In some baboons, high doses of N-OH-MDA, NNDMA and BDMPEA produced signs of behavioral toxicity (e.g. cyclic pattern of self-injection, behavioral agitation, stereotypical movements) that were similar to those previously observed after administration of high doses of classic psychomotor stimulants such as d-amphetamine; however, the severity and profile of this behavioral toxicity differed between compounds. Thus, the present study documents both similarities and differences in the behavioral profiles of these four phenethylamines.

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