Role of D1 receptor mechanisms in the potentiation of motor responses to L-DOPA and apomorphine by MK 801 in the reserpine-treated mouse

  • S. Kaur
  • M. S. Starr
  • B. S. Starr
Full Papers


In 24 h reserpine-treated akinetic mice, locomotion was induced by the D1-selective agonist SKF 38393 (30 mg/kg IP), or by the mixed D1/D2 agonists L-DOPA (150 mg/kg IP, plus benserazide 100 mg/kg IP) and apomorphine (0.5 mg/kg SC). The non-competitive NMDA receptor antagonist MK 801 (0.01–1.6 mg/kg IP) did not induce motor activity by itself, but potentiated the motor responses to L-DOPA and apomorphine at roughly 10-fold lower doses than those which facilitated D1 responding. These data cast doubt on the notion that glutamate antagonists enhance the antiparkinsonian efficacy of mixed D1/D2 agonists solely through a D1 receptor mechanism.

Key words

Mouse reserpine locomotion MK 801 SKF 38393 L-DOPA apomorphine 


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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • S. Kaur
    • 1
  • M. S. Starr
    • 2
  • B. S. Starr
    • 2
  1. 1.Department of PharmacologySchool of PharmacyLondonUK
  2. 2.Psychology Division, School of Health and Human SciencesUniversity of HertfordshireHatfieldUK

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