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Pallidal substrate of morphine-induced locomotion
Y Anagnostakis1, Y Krikos, C Spyraki
1Department of Basic Sciences, Medical School, University of Crete, Heraklion, Greece.
Summary
Morphine administration into the rat globus pallidus dose-dependently increased locomotor activity. This effect, mediated by opiate receptors, was observed across all tested pallidal regions.
Area of Science:
- Neuroscience
- Pharmacology
- Behavioral Science
Background:
- The globus pallidus is implicated in motor control and reward pathways.
- Opiate receptors are known to modulate motor activity.
Purpose of the Study:
- To investigate the effects of morphine microinjections into distinct regions of the rat globus pallidus on locomotor activity.
- To determine if the observed effects are mediated by opiate receptors.
Main Methods:
- Bilateral microinjections of varying doses of morphine hydrochloride or saline were administered into the dorsal, medial, and ventral regions of the rat globus pallidus.
- Locomotor activity was measured before and after microinjections.
- Naloxone pretreatment was used to assess the role of opiate receptors.
Main Results:
- Morphine induced a dose-dependent increase in locomotor activity.
- The increase in locomotion varied significantly across the three pallidal regions.
- Naloxone pretreatment blocked the hyperlocomotive effect of morphine.
Conclusions:
- The entire globus pallidus acts as a substrate for morphine-induced hyperlocomotion.
- Morphine's effects on locomotion in the globus pallidus are mediated by opiate receptors.