Cited by 25Cardiac electrophysiology and arrhythmiasIon channel regulation and functionCardiac Arrhythmias and Treatments

Atrial-selective prolongation of refractory period with AVE0118 is due principally to inhibition of sodium channel activity

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Burashnikov, Alexander, Barajas-Martinez, Hector, Hu, Dan, Nof, Eyal, Blazek, Jonathan, Antzelevitch, Charles·2012·Journal of Cardiovascular Pharmacology

Abstract

The action of AVE0118 to prolong effective refractory period (ERP) in atria but not in ventricles is thought to be due to its inhibition of IKur. However, in nonremodeled atria, AVE0118 prolongs ERP but not action potential duration (APD70-90), which can be explained with the inhibition of sodium but not potassium channel current. ERP, APD, and the maximum rate of increase of the AP upstroke (Vmax) were measured in the canine-isolated coronary-perfused right atrial and in superfused ventricular tissue preparations. Whole-cell patch-clamp techniques were used to measure sodium channel current in HEK293 cells stably expressing SCN5A. AVE0118 (5-10 μM) prolonged ERP (P < 0.001) but not APD70 and decreased Vmax (by 15%, 10 μM, P < 0.05; n = 10 for each). Ventricular ERP, APD90, and Vmax were not changed significantly by 10 μM AVE0118 (all P = ns; n = 7). AVE0118 effectively suppressed acetylcholine-mediated persistent atrial fibrillation. AVE0118 (10 μM) reduced peak current amplitude of SCN5A-WT current by 36.5% ± 6.6% (P < 0.01; n = 7) and shifted half-inactivation voltage (V0.5) of the steady-state inactivation curve from -89.9 ± 0.5 to -96.0 ± 0.9 mV (P < 0.01; n = 7). Our data suggest that AVE0118-induced prolongation of atrial, but not ventricular ERP, is due largely to atrial-selective depression of sodium channel current, which likely contributes to the effectiveness of AVE0118 to suppress atrial fibrillation.

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Authors
Burashnikov, A., Barajas-Martinez, H., Hu, D., Nof, E., Blazek, J., & Antzelevitch, C.
Affiliations
Masonic Medical Research Laboratory (US)
Venue
Journal of Cardiovascular Pharmacology
Published
2012-06
Volume
59
Issue
6
Pages
539-546
ISSN
0160-2446 (ISSN-L)
OpenAlex
W2068541942
Cited by
25
References
47
Citations by year
2025: 1 · 2024: 3 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 1 · 2016: 5 · 2015: 2 · 2014: 7
FWCI
1.85
Type
journal article
Language
en
Open access
Locations
  • Journal of Cardiovascular Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Heart, Lung, and Blood Institute (R01HL047678)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Arrhythmias and Treatments
Keywords
effective refractory period, atrial fibrillation, IKur, sodium current, SCN5A, action potential upstroke velocity, atrial electrophysiology, antiarrhythmic drugs
MeSH terms
Acetylcholine, Action Potentials, Animals, Atrial Fibrillation, Biphenyl Compounds, Dogs, Dose-Response Relationship, Drug, Heart Atria, Humans, Refractory Period, Electrophysiological, Potassium Channels, Sodium Channels, Patch-Clamp Techniques, Potassium Channel Blockers, Sodium Channel Blockers, HEK293 Cells

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