Journal
STEM CELL REPORTS
Volume 10, Issue 3, Pages 822-833Publisher
CELL PRESS
DOI: 10.1016/j.stemcr.2018.01.012
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Funding
- Campus Hungary Program [CHP/200-7/2014]
- AFib-TrainNet [675351]
- National Research Development and Innovation Office [NN-109904, ANN-113273]
- German Centre for Cardiovascular Research (DZHK)
- German Ministry of Education and Research (BMBF)
- German Research Foundation [DFG Es 88/12-1]
- European Research Council (ERC AG IndivuHeart)
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Human induced pluripotent stem cell (hiPSC) cardiomyocytes (CMs) show less negative resting membrane potential (RMP), which is attributed to small inward rectifier currents (I-K1). Here, I-K1 was measured in hiPSC-CMs (proprietary and commercial cell line) cultured as monolayer (ML) or 3D engineered heart tissue (EHT) and, for direct comparison, in CMs from human right atrial (RA) and left ventricular (LV) tissue. RMP was measured in isolated cells and intact tissues. I-K1 density in ML-and EHT-CMs from the proprietary line was similar to LV and RA, respectively. I-K1 density in EHT-CMs from the commercial line was 2-fold smaller than in the proprietary line. RMP in EHT of both lines was similar to RA and LV. Repolarization fraction and IK, ACh response discriminated best between RA and LV and indicated predominantly ventricular phenotype in hiPSC-CMs/EHT. The data indicate that I-K1 is not necessarily low in hiPSCCMs, and technical issues may underlie low RMP in hiPSC-CMs.
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