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Contrasting effects of the competitive NMDA antagonist CPP and the non-competitive NMDA antagonist MK 801 on performance of an operant delayed matching to position task in rats

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Abstract

The effects of the competitive NMDA antagonist CPP and the non-competitive NMDA antagonist MK 801 (dizolcipine) on short term working memory in the rat were investigated. The behavioural paradigm used was discrete trial, operant delayed matching to position, as originally described by Dunnett (1985), with delays of 0, 5, 15 and 30 s. These delays generated an orderly “forgetting” curve in control rats, with matching accuracy decreasing from approximately 100% at 0-s delay to approximately 75% at 30-s delay. Intraperitoneal (IP) administration of CPP (10 mg/kg) produced a markeddelay dependent impairment in performance, suggesting a specific effect on short term working memory. This effect was accompanied by a minor decrease in the speed of responding, and a slight increase in the number of missed trials. Lower doses of CPP had no significant effects on either matching accuracy or sedation. In contrast, IP administration of MK 801 (0.1 and 0.2 mg/kg) caused a markeddelay independent impairment in the accuracy of delayed matching performance, suggesting a non-specific disruption of performance. A lower dose (0.05 mg/kg) of MK 801 had no significant effect on matching accuracy. The two lower doses of MK 801 increased the number of nose pokes made during the delays and tended to increase the speed of responding, suggesting a stimulant-like action. The highest dose of MK 801 had the opposite effects and also decreased the number of trials completed. The results with CPP therefore support the hypothesized role of NMDA receptors in learning and memory, and the contrasting effects of these two NMDA antagonists support previous suggestions of different behavioural effects resulting from administration of competitive and non-competitive NMDA antagonists.

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  1. Department of Neuropsychopharmacology. Schering AG, Müllerstr. 170-178, W-1000, Berlin 65, Germany

    B. J. Cole, M. Klewer, G. H. Jones & D. N. Stephens

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  1. B. J. Cole
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  2. M. Klewer
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  3. G. H. Jones
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  4. D. N. Stephens
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Cole, B.J., Klewer, M., Jones, G.H. et al. Contrasting effects of the competitive NMDA antagonist CPP and the non-competitive NMDA antagonist MK 801 on performance of an operant delayed matching to position task in rats. Psychopharmacology 111, 465–471 (1993). https://doi.org/10.1007/BF02253537

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  • DOI: https://doi.org/10.1007/BF02253537

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