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Neurochemical and behavioural investigations of the NMDA receptor-associated glycine site in the rat striatum: Functional implications for treatment of parkinsonian symptoms

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Abstract

The glutamatergic cortico-striatal and subthalamo-entopeduncular pathways are both overactive in parkinsonism. Previous behavioural investigations have shown that intra-entopeduncular injection of either NMDA-site or glycine-site antagonists results in alleviation of parkinsonian symptoms, although injection of the former is associated with the appearance of anaesthetic-like side effects. These behavioural differences may be mediated by action on different NMDA receptor subtypes. Recent neurochemical and molecular pharmacological studies have indicated the existence of NMDA receptor subtypes which display differential modulation by glycine. In the present study, three potential modes of NMDA antagonism were differentiated in vitro by effects on [3H]-glycine binding to striatal sections. Specific [3H]-glycine binding was totally displaced by the glycine partial agonist (R)-HA-966; the NMDA-site antagonistd-CPP had no effect; and the NMDA-site antagonistd-AP5 displaced [3H]-glycine binding in a subpopulation of glycine sites. The anti-parkinsonian effects of (R)-HA-966,d-CPP andd-AP5 were assessed by intra-striatal injection in reserpine-treated rats and 6-OHDA-lesioned rats. Injection of (R)-HA-966 andd-CPP resulted in alleviation of parkinsonian akinesia, although the latter elicited anaesthetic-like side effects;d-AP5 was ineffective as an anti-parkinsonian agent. (R)-HA-966 was also effective as an anti-parkinsonian agent when administered systemically in the reserpine-treated rat. These data suggest that different classes of NMDA antagonist mediate different behavioural responses within the parkinsonian striatum. The behavioural response produced may depend on the exact nature of the conformational change induced by the antagonist and the location of the subtype most sensitive to that class of compound. Selection of a specific mode of NMDA receptor antagonism or targeting of striatal NMDA receptor subtypes may form the basis of a novel therapeutic approach to Parkinson's disease.

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Authors and Affiliations

  1. 1.124, Biological Sciences, Stopford Building, University of Manchester, Oxford Road, M13 9PT, Manchester, UK

    C. B. Carroll, V. Holloway & J. M. Brotchie

  2. School of Psychology, Edgbastow, The University of Birmingham, B15 2TT, Birmingham, UK

    I. J. Mitchell

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  1. C. B. Carroll
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  2. V. Holloway
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  3. J. M. Brotchie
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  4. I. J. Mitchell
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Carroll, C.B., Holloway, V., Brotchie, J.M. et al. Neurochemical and behavioural investigations of the NMDA receptor-associated glycine site in the rat striatum: Functional implications for treatment of parkinsonian symptoms. Psychopharmacology 119, 55–65 (1995). https://doi.org/10.1007/BF02246054

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  • DOI: https://doi.org/10.1007/BF02246054

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