The effects of paeonol on the electrophysiological properties of cardiac ventricular myocytes

Yu ling Ma, Susan Bates, Alison M. Gurney

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Previous studies have shown that "Mudanpi", a Chinese herbal medicine, has a significant cardioprotective effect against myocardial ischaemia. Based on these findings we hypothesised that paeonol, the main component of Mudanpi, might have an effect on the cellular electrophysiology of cardiac ventricular myocytes. The effects of paeonol on the action potential and ion channels of cardiac ventricular myocytes were studied using the standard whole-cell configuration of the patch-clamp technique. Ventricular myocytes were isolated from the hearts of adult guinea-pig by enzymic dispersion. The myocytes were continuously perfused with various experimental solutions at room temperature and paeonol applied in the perfusate. Action potentials and membrane currents were recorded using both current and voltage clamp modes of the patch-clamp technique. Paeonol, at concentrations 160 μM and 640 μM, decreased the action potential upstroke phase, an action associated with the blockade of the voltage-gated, fast sodium channel. The effects of paeonol on both action potential and Na+ current were concentration dependent. Paeonol had a high affinity for inactivated sodium channels. Paeonol also shortened the action potential duration, in a manner not associated with the blockade of the calcium current, or the enhancement of potassium currents. These findings suggest that paeonol, and therefore Mudanpi, may possess antiarrhythmic activity, which may confer its cardioprotective effects. © 2006 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)87-92
    Number of pages5
    JournalEuropean journal of pharmacology
    Volume545
    Issue number2-3
    DOIs
    Publication statusPublished - 18 Sep 2006

    Keywords

    • Action potential
    • Paeonol
    • Sodium current
    • Ventricular myocyte
    • Whole-cell patch-clamp

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