Journal
JOURNAL OF PHARMACOLOGICAL AND TOXICOLOGICAL METHODS
Volume 87, Issue -, Pages 93-98Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.vascn.2017.03.003
Keywords
Dimethyl sulfoxide (DMSO); Ethanol; Human-induced pluripotent stem cells-derived cardiomyocytes (hiPSC-CMs); Multi-electrode array (MEA); Patch clamp technique
Categories
Funding
- Ministry of Food and Drug Safety [14182MFDS506]
- Korea Institute of Toxicology [KK-1610-01]
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Introduction: Recently, electrophysiological activity has been effectively measured in human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) to predict drug-induced arrhythmia. Dimethyl sulfoxide (DMSO) and ethanol have been used as diluting agents in many experiments. However, the maximum DMSO and ethanol concentrations that can be effectively used in the measurement of electrophysiological parameters in hiPSC-CMs-based patch clamp and multi-electrode array (MEA) have not been fully elucidated. Methods: We investigated the effects of varying concentrations of DMSO and ethanol used as diluting agents on several electrophysiological parameters in hiPSC-CMs using patch clamp and MEA. Results: Both DMSO and ethanol at concentrations > 1% in external solution resulted in osmolality >400 mOsmol/kg, but pH was not affected by either agent. Neither DMSO nor ethanol led to cell death at the concentrations examined. However, resting membrane potential, action potential amplitude, action potential duration at 90% and 40%, and corrected field potential duration were decreased significantly at 1% ethanol concentration. DMSO at 1% also significantly decreased the sodium spike amplitude. In addition, the waveform of action potential and field potential was recorded as irregular at 3% concentrations of both DMSO and ethanol. Concentrations of up to 0.3% of either agent did not affect osmolality, pH, cell death, or electrophysiological parameters in hiPSC-CMs. Discussion: Our findings suggest that 0.3% is the maximum concentration at which DMSO or ethanol should be used for dilution purposes in hiPSC-CMs-based patch clamp and MEA.
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