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Mecamylamine attenuates ephedrine-induced hyperactivity in rats
Dennis K Miller1, Ines L Segert
1Department of Psychological Sciences and Interdisciplinary Neuroscience Program, University of Missouri, 208 McAlester Hall, Columbia, MO 65211, USA. millerden@missouri.edu
Pharmacology, Biochemistry, and Behavior
|May 17, 2005
Summary
Nicotinic acetylcholine receptors (nAChRs) mediate locomotor sensitization to ephedrine in rats. Blocking nAChRs reduced ephedrine
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Ephedrine is a central nervous system stimulant with amphetamine-like effects.
- Repeated ephedrine administration leads to locomotor sensitization in rats.
- Nicotinic acetylcholine receptors (nAChRs) are implicated in locomotor sensitization to other stimulants like amphetamine.
Purpose of the Study:
- To investigate the role of nAChRs in mediating the locomotor effects of ephedrine.
- To determine if nAChRs are involved in the development of acute and repeated ephedrine-induced hyperactivity and sensitization.
Main Methods:
- Rats received daily injections of ephedrine (10-30 mg/kg) or saline for 12 days.
- Locomotor activity was measured after pretreatment with the nAChR antagonist mecamylamine (0.3-3.0 mg/kg) or saline.
- Dose-dependent effects of ephedrine and mecamylamine on locomotor activity were assessed.
Main Results:
- Ephedrine caused a dose-dependent increase in locomotor activity.
- Sensitization to ephedrine developed with repeated administration.
- Mecamylamine attenuated ephedrine-induced hyperactivity and sensitization, particularly with repeated lower doses, but this effect was overcome by higher ephedrine doses.
Conclusions:
- Nicotinic acetylcholine receptors (nAChRs) play a significant role in the development of locomotor sensitization to ephedrine.
- The findings suggest nAChRs are key mediators of ephedrine's long-term behavioral effects.