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Behavioral effects of N-ethyl-3,4-methylenedioxyamphetamine (MDE; "EVE")
1Department of Pharmacology, Northeastern Ohio Universities College of Medicine, Rootstown 44272.
Abstract:
Eight male rats were trained to discriminate 2.0 mg/kg N-ethyl-3,4-methylenedioxyamphetamine (MDE) from its vehicle using a two-lever, food-motivated operant discrimination task. Once trained, the rats showed a dose-dependent decrease in discriminative accuracy following administration of decreased doses of MDE (ED50 = 0.75 mg/kg). Administration of 1.5 mg/kg 3,4-methylenedioxymethamphetamine (MDMA), a recently restricted Schedule I drug, produced 100% MDE-appropriate responding in the MDE-trained rats and decreased discriminative performance was similarly observed following lower doses of MDMA (ED50 = 0.62 mg/kg). The difference in relative potencies of MDE and MDMA in rats is reminiscent of those seen in human abusers who report effective oral psychotomimetic doses. Time-course data indicated that MDE has a fast onset, 100% drug-correct responding 10 min post-injection, and a peak effect between 10-20 min with declining effect at 60-120 min post-administration. These findings along with those of others show a pharmacological similarity between MDE and MDMA. Implications as to the future scheduling of MDE are discussed.
Insights
N-ethyl-3,4-methylenedioxyamphetamine (MDE) and 3,4-methylenedioxymethamphetamine (MDMA) show similar pharmacological effects in rats. Both drugs produced dose-dependent decreases in discriminative accuracy, suggesting comparable psychotomimetic properties.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- N-ethyl-3,4-methylenedioxyamphetamine (MDE) and 3,4-methylenedioxymethamphetamine (MDMA) are psychoactive substances with reported similarities in human abuse.
- Understanding the comparative pharmacology of MDE and MDMA is crucial for assessing their abuse potential and informing regulatory decisions.
Purpose of the Study:
- To investigate the discriminative stimulus properties of MDE in a rat operant task.
- To compare the relative potencies of MDE and MDMA in trained rats.
- To characterize the time course of MDE's effects.
Main Methods:
- Eight male rats were trained to discriminate MDE (2.0 mg/kg) from its vehicle using a two-lever, food-motivated operant task.
- Dose-response curves were generated for MDE and MDMA to determine ED50 values for discriminative accuracy.
- Time-course data were collected post-injection to assess the onset, peak, and duration of MDE's effects.
Main Results:
- Rats reliably discriminated MDE from its vehicle.
- MDE produced a dose-dependent decrease in discriminative accuracy (ED50 = 0.75 mg/kg).
- MDMA (1.5 mg/kg) produced 100% MDE-appropriate responding, with lower doses showing decreased performance (ED50 = 0.62 mg/kg).
- MDE demonstrated a rapid onset of action, with peak effects observed 10-20 minutes post-injection.
Conclusions:
- MDE and MDMA exhibit pharmacological similarities in rats, as evidenced by comparable discriminative stimulus effects and relative potencies.
- The findings support the notion of shared psychotomimetic properties between MDE and MDMA, consistent with human abuse reports.
- The data have implications for the scheduling and regulation of MDE.