Abstract
The effects of cocaine andd-amphetamine, two psychomotor stimulant drugs with pronounced addictive properties, on the electroencephalogram (EEG) of rats were studied by telemetric recordings from the skull in non-anesthetized, freely moving rats. The electrocorticogram (ECoG) was recorded. Both cocaine (10 mg/kg IP) andd-amphetamine (0.4 mg/kg IP) produced a desynchronization, characterized by a general lowering in power in all of the frequency bands. These effects of both drugs were mimicked by the selective agonist at D1 receptors SK&F 38393 (3 mg/kg SC) and were reversed by the antagonist at D1 receptors SCH 23390 (0.2 mg/kg IP) but not influenced by haloperidol (0.1 mg/kg IP) in a dose which is likely to block D2 rather than D1 receptors. These doses of cocaine ord-amphetamine did not produce stereotyped behaviour and slight, if any, increases in locomotor activity only. Large doses of cocaine (30 mg/kg IP) ord-amphetamine (4 mg/kg IP) produced stereotyped behaviour and alterations in EEG which are, based on previous own studies, characteristic for additional stimulation of D2 receptors. This was manifest in a selective increase in power of the alpha-1 band. A similar effect was also produced by the agonist both at D1 and D2 receptors, apomorphine (0.5 mg/kg SC). These results suggest that moderate, but probably rewarding doses of cocaine ord-amphetamine mainly activate D1 dopamine receptors. This activation might be relevant for the rewarding properties of these drugs.
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Ferger, B., Kropf, W. & Kuschinsky, K. Studies on electroencephalogram (EEG) in rats suggest that moderate doses of cocaine ord-amphetamine activate D1 rather than D2 receptors. Psychopharmacology 114, 297–308 (1994). https://doi.org/10.1007/BF02244852
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DOI: https://doi.org/10.1007/BF02244852