Cited by 186Pluripotent Stem Cells ResearchCardiac electrophysiology and arrhythmiasTissue Engineering and Regenerative Medicine

Functional sarcoplasmic reticulum for calcium handling of human embryonic stem cell-derived cardiomyocytes: insights for driven maturation

Liu, Jing, Fu, Ji Dong, Siu, Chung Wah, Li, Ronald A.·2007·Stem Cells

Abstract

Cardiomyocytes (CMs) are nonregenerative. Self-renewable pluripotent human embryonic stem cells (hESCs) can differentiate into CMs for cell-based therapies. In adult CMs, Ca2+-induced Ca2+ release from the sarcoplasmic reticulum (SR) via the ryanodine receptor (RyR) is key in excitation-contraction coupling. Therefore, proper Ca2+ handling properties of hESC-derived CMs are required for their successful functional integration with the recipient heart. Here, we performed a comprehensive analysis of CMs differentiated from the H1 (H1-CMs) and HES2 (HES2-CMs) hESC lines and human fetal (F) and adult (A) left ventricular (LV) CMs. Upon electrical stimulation, all of H1-, HES2-, and FLV-CMs generated similar Ca2+ transients. Caffeine induced Ca2+ release in 65% of FLV-CMs and ∼38% of H1- and HES2-CMs. Ryanodine significantly reduced the electrically evoked Ca2+ transient amplitudes of caffeine-responsive but not -insensitive HES2- and H1-CMs and slowed their upstroke; thapsigargin, which inhibits the sarco/endoplasmic reticulum Ca2+-ATPase (SERCA) pump, reduced the amplitude of only caffeine-responsive HES2- and H1-CMs and slowed the decay. SERCA2a expression was highest in ALV-CMs but comparable among H1-, HES2-, and FLV-CMs. The Na+-Ca2+ exchanger was substantially expressed in both HES2- and H1-CMs relative to FLV- and ALV-CMs. RyR was expressed in HES2-, H1-, and FLV-CMs, but the organized pattern for ALV-CMs was not observed. The regulatory proteins junctin, triadin, and calsequestrin were expressed in ALV-CMs but not HES2- and H1-CMs. We conclude that functional SRs are indeed expressed in hESC-CMs, albeit immaturely. Our results may lead to driven maturation of Ca2+ handling properties of hESC-CMs for enhanced contractile functions. Disclosure of potential conflicts of interest is found at the end of this article.

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Crossref · 10.1634/stemcells.2007-0549

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  • Transcript analysis of hvCOC and other engineered constructs showed changes consistent with prior maturation studies.

    “Transcript analysis of 2D-cultured clusters [24] and alternative engineered constructs, including human ventricular cardiac micro-tissues (hvCMT; ~1000 cells) [18], tissue strips (hvCTS; ~106 cells) [14] and hvCOC made of identical constituent hPSC-vCMs, revealed changes consistent with our previous maturation studies [18,24–28].”

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Authors
Liu, J., Fu, J. D., Siu, C. W., & Li, R. A.
Affiliations
  • University of California, Davis (US)
  • Shriners Hospitals for Children - Northern California (US)
Corresponding author
Li, Ronald A.
Venue
Stem Cells
Published
2007-09-13
Volume
25
Issue
12
Pages
3038-3044
ISSN
  • 1066-5099 (ISSN-L)
  • 1549-4918
OpenAlex
W1991421066
Cited by
186
References
40
Citations by year
2025: 1 · 2023: 4 · 2022: 1 · 2021: 6 · 2020: 4 · 2019: 8 · 2018: 9 · 2017: 9 · 2016: 17 · 2015: 17 · 2014: 16 · 2013: 19 · 2012: 17
FWCI
4.76
Type
journal article
Language
en
Open access
closed
Locations
  • Stem Cells (publishedVersion)
  • PubMed (publishedVersion)
  • The HKU Scholars Hub (University of Hong Kong) (submittedVersion)
Funders
  • California Institute for Regenerative Medicine
  • Croucher Foundation
  • National Institutes of Health
  • University of California, Davis
  • National Heart, Lung, and Blood Institute (R01 HL-72857, R01HL072857)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pluripotent Stem Cells Research
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
  • Health Sciences › Medicine › Surgery › Tissue Engineering and Regenerative Medicine
Keywords
sarcoplasmic reticulum, calcium handling, human embryonic stem cell-derived cardiomyocytes, ryanodine receptor, SERCA2a, Na+/Ca2+ exchanger, excitation-contraction coupling, cardiomyocyte maturation, caffeine-induced calcium release, thapsigargin, junctin, triadin, calsequestrin, H1 cell line
MeSH terms
Adolescent, Caffeine, Calcium, Cell Differentiation, Cell Line, Fetus, Humans, Ryanodine, Sarcoplasmic Reticulum, Myocytes, Cardiac, Embryonic Stem Cells

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