Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5556508 | Journal of Pharmacological and Toxicological Methods | 2017 | 21 Pages |
Abstract
Drug-induced cardiotoxicity poses a negative impact on public health and drug development. Cardiac safety pharmacology issues urged for the preclinical assessment of drug-induced ventricular arrhythmia leading to the design of several in vitro electrophysiological screening assays. In general, patch clamp systems allow for intracellular recordings, while multi-electrode array (MEA) technology detect extracellular activity. Here, we demonstrate a complementary metal oxide semiconductor (CMOS)-based MEA system as a reliable platform for non-invasive, long-term intracellular recording of cardiac action potentials at high resolution. Quinidine (8 concentrations from 10â 7 to 2.10â 5 M) and verapamil (7 concentrations from 10â 11 to 10â 5 M) were tested for dose-dependent responses in a network of cardiomyocytes. Electrophysiological parameters, such as the action potential duration (APD), rates of depolarization and repolarization and beating frequency were assessed. In hiPSC, quinidine prolonged APD with EC50 of 2.2·10â 6 M. Further analysis indicated a multifactorial action potential prolongation by quinidine: (1) decreasing fast repolarization with IC50 of 1.1·10â 6 M; (2) reducing maximum upstroke velocity with IC50 of 2.6·10â 6 M; and (3) suppressing spontaneous activity with EC50 of 3.8·10â 6 M. In rat neonatal cardiomyocytes, verapamil blocked spontaneous activity with EC50 of 5.3·10â 8 M and prolonged the APD with EC50 of 2.5·10â 8 M. Verapamil reduced rates of fast depolarization and repolarization with IC50s of 1.8 and 2.2·10â 7 M, respectively. In conclusion, the proposed action potential-based MEA platform offers high quality and stable long-term recordings with high information content allowing to characterize multi-ion channel blocking drugs. We anticipate application of the system as a screening platform to efficiently and cost-effectively test drugs for cardiac safety.
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Authors
Danny Jans, Geert Callewaert, Olga Krylychkina, Luis Hoffman, Francesco Gullo, Dimiter Prodanov, Dries Braeken,