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Research Library

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Cannabidiol inhibits multiple cardiac ion channels and shortens ventricular action potential duration in vitro

  • Journal : European Journal of Pharmacology
  • Publication Year : 2020
  • Authors : Marguerite Le Marois, Véronique Ballet, Camille Sanson, Magali-Anne Maizières, Thierry Carriot, Céline Chantoiseau, Michel Partiseti, & Georg Andrees Bohme

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Abstract

Cannabidiol (CBD) is a non-psychoactive component of Cannabis which has recently received regulatory consideration for the treatment of intractable forms of epilepsy such as the Dravet and the Lennox-Gastaut syndromes. The mechanisms of the antiepileptic effects of CBD are unclear, but several pre-clinical studies suggest the involvement of ion channels. Therefore, we have evaluated the effects of CBD on seven major cardiac currents shaping the human ventricular action potential and on Purkinje fibers isolated from rabbit hearts to assess the in vitro cardiac safety profile of CBD. We found that CBD inhibits with comparable micromolar potencies the peak and late components of the NaV1.5 sodium current, the CaV1.2 mediated L-type calcium current, as well as all the repolarizing potassium currents examined except Kir2.1. The most sensitive channels were KV7.1 and the least sensitive were KV11.1 (hERG), which underly the slow (IKs) and rapid (IKr) components, respectively, of the cardiac delayed-rectifier current. In the Purkinje fibers, CBD decreased the action potential (AP) duration more potently at half-maximal than at near complete repolarization, and slightly decreased the AP amplitude and its maximal upstroke velocity. CBD had no significant effects on the membrane resting potential except at the highest concentration tested under fast pacing rate. These data show that CBD impacts cardiac electrophysiology and suggest that caution should be exercised when prescribing CBD to carriers of cardiac channelopathies or in conjunction with other drugs known to affect heart rhythm or contractility.

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