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[Comparison of central stimulating effects between ephedrine and apomorphine]
Zhongguo Yao Li Xue Bao = Acta Pharmacologica Sinica
|September 1, 1991
Summary
Ephedrine enhances motor activity via alpha 1-adrenoceptors, not dopamine receptors, unlike apomorphine. Ephedrine
Area of Science:
- Pharmacology
- Neuroscience
Background:
- Ephedrine and apomorphine are known psychoactive compounds.
- Their mechanisms of action on central nervous system receptors are not fully elucidated.
Purpose of the Study:
- To investigate the receptor mechanisms underlying the central stimulating effects of ephedrine.
- To differentiate the actions of ephedrine from apomorphine on motor activity and related behaviors.
Main Methods:
- Comparative pharmacological studies in mice, rats, and dogs.
- Administration of ephedrine and apomorphine with and without receptor antagonists (prazosin, sulpiride).
- Assessment of motor activity, stereotyped behavior, catalepsy, and emesis.
Main Results:
- Ephedrine's motor potentiation was blocked by prazosin (alpha 1-adrenoceptor antagonist) but not sulpiride (dopamine antagonist).
- Apomorphine's motor effects and stereotyped behaviors were not inhibited by prazosin.
- Ephedrine did not induce stereotyped behavior or antagonize catalepsy, unlike apomorphine.
- Ephedrine did not cause vomiting, even at lethal doses, whereas apomorphine did.
Conclusions:
- The central stimulating action of ephedrine is primarily mediated by alpha 1-adrenoceptors.
- Ephedrine's mechanism of action differs significantly from that of apomorphine, which acts on dopamine receptors.