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Locomotor hyperactivity induced by MK-801 in rats
Polish Journal of Pharmacology and Pharmacy
|November 1, 1991
Summary
MK-801 causes hyperactivity in rats, which is reduced by dopamine antagonists. This suggests the dopamine system plays a key role in MK-801-induced locomotor hyperactivity.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- MK-801 is an NMDA receptor antagonist known to induce hyperactivity.
- The precise neurochemical pathways underlying MK-801-induced hyperactivity require further elucidation.
Purpose of the Study:
- To investigate the neurochemical mechanisms, particularly the involvement of the dopamine system, in MK-801-induced locomotor hyperactivity in rats.
Main Methods:
- Rats were administered MK-801 alone or in combination with various dopaminergic agents (haloperidol, SCH 23390, sulpiride, D-amphetamine, apomorphine).
- The effects of other receptor antagonists (atropine, prazosin, idazoxan, ritanserin) and catecholamine depletors (alpha-methyl-p-tyrosine, reserpine) on MK-801-induced hyperactivity were assessed.
Main Results:
- Haloperidol, SCH 23390 (dopamine D-1 antagonist), and sulpiride (dopamine D-2 antagonist) antagonized MK-801-induced hyperactivity.
- Combined administration of MK-801 with D-amphetamine or apomorphine potentiated hyperactivity.
- Pretreatment with alpha-methyl-p-tyrosine or reserpine reduced or abolished hyperactivity, respectively.
Conclusions:
- The dopamine system is significantly involved in mediating MK-801-induced locomotor hyperactivity.
- These findings highlight the complex interplay between NMDA receptors and dopaminergic pathways in regulating motor activity.