Abstract
This study examined the interaction between various glutamate antagonists and selective D1 (SKF 38393) and D2 (RU 24213) dopamine agonists in the production of locomotion in the reserpine-treated mouse. Firstly, in normal mice, the NMDA channel blocker MK 801 (0.1–1.6 mg/kg) caused a biphasic stimulation/depression of locomotor activity, whereas the competitive NMDA antagonists CGP 40116 (0.25–8 mg/kg) and CPP (0.2–20 mg/kg), and the NMDA glycine site antagonist HA 966 (0.4–10 mg/kg) inhibited locomotion monophasically. These compounds caused varying degrees of muscle weakness and impairment of posture and gait, whilst the AMPA receptor blocker NBQX (0.2–25 mg/kg) had no significant effect on unconditioned mouse motor behaviour. None of the antagonists reversed reserpine-induced akinesia by themselves, but they all potentiated the locomotor movements induced by 30 mg/kg SKF 38393. Movements remained fluent with low doses of CPP, HA 966 and NBQX, but became ataxic with MK 801 and CGP 40116, with sedation prevailing at high doses of all the antagonists, as in normal mice. CPP and NBQX also combined synergistically with SKF 38393 to promote tonic convulsions. By contrast, RU 24213-induced locomotion was dose-dependently depressed by MK 801, CGP 40116 and HA 966, but was unaffected by CPP or NBQX. These differential effects of NMDA and AMPA antagonists on D1 and D2 motor responding in the monoamine-depleted mouse are discussed in terms of possible mechanisms and sites of action within the brain, and the implications for their putative use as adjuvants tol-dopa in antiparkinson therapy.
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Starr, M.S., Starr, B.S. Comparison of the effects of NMDA and AMPA antagonists on the locomotor activity induced by selective D1 and D2 dopamine agonists in reserpine-treated mice. Psychopharmacology 114, 469–476 (1994). https://doi.org/10.1007/BF02249338
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DOI: https://doi.org/10.1007/BF02249338