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Abstract

The self-administration of MK-801 can depend upon drug-reinforcement history, and its discriminative stimulus properties are phencyclidine-like in rhesus monkeys.

P M Beardsley, B A Hayes and R L Balster
Journal of Pharmacology and Experimental Therapeutics March 1990, 252 (3) 953-959;
P M Beardsley
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B A Hayes
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R L Balster
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Abstract

The proposed noncompetitive N-methyl-D-aspartate antagonist MK-801 [(+)-5-methyl-10,11-dihydro-5H-dibenzo(a,d)cyclohepten-5,10-imine maleate] has therapeutic potential as an anticonvulsant and neuroprotectant. Previous research has demonstrated that MK-801 shares many of the biochemical and pharmacological actions of the abused drug phencyclidine (PCP). The purpose of the present study was to determine whether rhesus monkeys would self-administer i.v. MK-801 and to determine whether MK-801 has discriminative stimulus properties similar to those of PCP. Four Rhesus monkeys were trained to press response levers according to fixed-ratio 10 schedules of reinforcement for infusions of cocaine (33 micrograms/kg/injection) or PCP (10 micrograms/kg/injection). Various doses of MK-801 were evaluated during substitution tests to determine whether they would maintain lever pressing. None of the four rhesus monkeys tested self-administered MK-801 when it was offered to them after a recent history of cocaine self-administration. Three of the four monkeys, however, did self-administer MK-801 when provided a history of PCP self-administration. All four rhesus monkeys given drug discrimination training with 80 micrograms/kg PCP and tested with MK-801 generalized from the PCP stimulus in a dose-dependent manner. MK-801 was about 2 to 3 times more potent and had a longer duration of action than PCP. Overall, these results provide further evidence in a primate species of similarities in the behavioral effects of MK-801 and PCP, and suggest that MK-801 may have abuse potential of the PCP type.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 252, Issue 3
1 Mar 1990
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Abstract

The self-administration of MK-801 can depend upon drug-reinforcement history, and its discriminative stimulus properties are phencyclidine-like in rhesus monkeys.

P M Beardsley, B A Hayes and R L Balster
Journal of Pharmacology and Experimental Therapeutics March 1, 1990, 252 (3) 953-959;

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Abstract

The self-administration of MK-801 can depend upon drug-reinforcement history, and its discriminative stimulus properties are phencyclidine-like in rhesus monkeys.

P M Beardsley, B A Hayes and R L Balster
Journal of Pharmacology and Experimental Therapeutics March 1, 1990, 252 (3) 953-959;
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