Non-cell autonomous cues for enhanced functionality of human embryonic stem cell-derived cardiomyocytes via maturation of sarcolemmal and mitochondrial K ATP channels

Wendy Keung, Lihuan Ren, Li Sen Li, Andy On Tik Wong, Anant Chopra, Chi Wing Kong, Gordon F. Tomaselli, Christopher S. Chen, Ronald A. Li

Research output: Contribution to journalArticle

Abstract

Human embryonic stem cells (hESCs) is a potential unlimited ex vivo source of ventricular (V) cardiomyocytes (CMs), but hESC-VCMs and their engineered tissues display immature traits. In adult VCMs, sarcolemmal (sarc) and mitochondrial (mito) ATP-sensitive potassium (K ATP) channels play crucial roles in excitability and cardioprotection. In this study, we aim to investigate the biological roles and use of sarcK ATP and mitoK ATP in hESC-VCM. We showed that SarcI K, ATP in single hESC-VCMs was dormant under baseline conditions, but became markedly activated by cyanide (CN) or the known opener P1075 with a current density that was ∼8-fold smaller than adult; These effects were reversible upon washout or the addition of GLI or HMR1098. Interestingly, sarcI K, ATP displayed a ∼3-fold increase after treatment with hypoxia (5% O 2). MitoI K, ATP was absent in hESC-VCMs. However, the thyroid hormone T3 up-regulated mitoI K, ATP, conferring diazoxide protective effect on T3-treated hESC-VCMs. When assessed using a multi-cellular engineered 3D ventricular cardiac micro-tissue (hvCMT) system, T3 substantially enhanced the developed tension by 3-folds. Diazoxide also attenuated the decrease in contractility induced by simulated ischemia (1% O 2). We conclude that hypoxia and T3 enhance the functionality of hESC-VCMs and their engineered tissues by selectively acting on sarc and mitoI K, ATP.

Original languageEnglish (US)
Article number34154
JournalScientific Reports
Volume6
DOIs
StatePublished - Sep 28 2016

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Cardiac Myocytes
Cues
Adenosine Triphosphate
Diazoxide
KATP Channels
Cyanides
Triiodothyronine
mitochondrial K(ATP) channel
Human Embryonic Stem Cells
Ischemia

ASJC Scopus subject areas

  • General

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Non-cell autonomous cues for enhanced functionality of human embryonic stem cell-derived cardiomyocytes via maturation of sarcolemmal and mitochondrial K ATP channels. / Keung, Wendy; Ren, Lihuan; Sen Li, Li; Wong, Andy On Tik; Chopra, Anant; Kong, Chi Wing; Tomaselli, Gordon F.; Chen, Christopher S.; Li, Ronald A.

In: Scientific Reports, Vol. 6, 34154, 28.09.2016.

Research output: Contribution to journalArticle

Keung, Wendy ; Ren, Lihuan ; Sen Li, Li ; Wong, Andy On Tik ; Chopra, Anant ; Kong, Chi Wing ; Tomaselli, Gordon F. ; Chen, Christopher S. ; Li, Ronald A. / Non-cell autonomous cues for enhanced functionality of human embryonic stem cell-derived cardiomyocytes via maturation of sarcolemmal and mitochondrial K ATP channels. In: Scientific Reports. 2016 ; Vol. 6.
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