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[The antiarrhythmic effect of sophoramine]
Yao Xue Xue Bao = Acta Pharmaceutica Sinica
|January 1, 1989
Summary
Sophoramine, an alkaloid from Sophora alopecuroides L., effectively treats experimental arrhythmias in animals. It prolongs cardiac intervals and the effective refractory period, suggesting potential anti-arrhythmic properties.
Area of Science:
- Pharmacology
- Cardiovascular Research
- Natural Products Chemistry
Context:
- Cardiac arrhythmias represent a significant global health burden, necessitating the discovery of novel therapeutic agents.
- Natural products, such as alkaloids, have historically provided valuable leads for drug development.
- Sophora alopecuroides L. is a traditional medicinal plant with a long history of use, prompting investigation into its bioactive constituents.
Purpose:
- To investigate the anti-arrhythmic effects of sophoramine, an alkaloid isolated from Sophora alopecuroides L., in various animal models.
- To elucidate the underlying electrophysiological mechanisms responsible for sophoramine's anti-arrhythmic actions.
- To determine the acute toxicity profile of sophoramine.
Summary:
- Sophoramine demonstrated significant efficacy in suppressing experimental arrhythmias induced by diverse agents (aconitine, BaCl2, CaCl2, chloroform, and chloroform-adrenalin) in rats, mice, and rabbits.
- Electrophysiological studies in rats revealed that intravenous sophoramine administration prolonged RR and PR intervals, depressed isoprenaline-induced tachycardia but not atropine-induced tachycardia.
- In vitro experiments showed sophoramine prolonged the effective refractory period (ERP) of isolated rabbit left atria and exhibited negative automaticity, chronotropic, and conduction effects.
Impact:
- These findings establish sophoramine as a promising candidate for further development as an anti-arrhythmic drug.
- The study provides a pharmacological basis for the traditional use of Sophora alopecuroides L. in cardiovascular conditions.
- Understanding sophoramine's mechanism of action can guide the design of novel anti-arrhythmic therapies with improved efficacy and safety profiles.
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