Coculturing with endothelial cells promotes in vitro maturation and electrical coupling of human embryonic stem cell-derived cardiomyocytes

Jennifer Pasquier, Renuka Gupta, Damien Rioult, Jessica Hoarau, Raphael Jean Courjaret, Khaled Machaca, Jassim Al Suwaidi, Edouard G. Stanley, Shahin Rafii, David A. Elliott, Charbel Abi Khalil, Arash Rafii Tabrizi

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10 Citations (Scopus)

Abstract

Background: Pluripotent human embryonic stem cells (hESC) are a promising source of repopulating cardiomyocytes. We hypothesized that we could improve maturation of cardiomyocytes and facilitate electrical interconnections by creating a model that more closely resembles heart tissue; that is, containing both endothelial cells (ECs) and cardiomyocytes. Methods: We induced cardiomyocyte differentiation in the coculture of an hESC line expressing the cardiac reporter NKX2.5-green fluorescent protein (GFP), and an Akt-activated EC line (E4+ECs). We quantified spontaneous beating rates, synchrony, and coordination between different cardiomyocyte clusters using confocal imaging of Fura Red-detected calcium transients and computer-assisted image analysis. Results: After 8 days in culture, 94% ± 6% of the NKX2-5GFP+ cells were beating when hESCs embryonic bodies were plated on E4+ECs compared with 34% ± 12.9% for controls consisting of hESCs cultured on BD Matrigel (BD Biosciences) without ECs at Day 11 in culture. The spatial organization of beating areas in cocultures was different. The GFP+ cardiomyocytes were close to the E4+ECs. The average beats/min of the cardiomyocytes in coculture was faster and closer to physiologic heart rates compared with controls (50 ± 14 [n = 13] vs 25 ± 9 [n = 8]; p < 0.05). The coculture with ECs led to synchronized beating relying on the endothelial network, as illustrated by the loss of synchronization upon the disruption of endothelial bridges. Conclusions: The coculturing of differentiating cardiomyocytes with Akt-activated ECs but not EC-conditioned media results in (1) improved efficiency of the cardiomyocyte differentiation protocol and (2) increased maturity leading to better intercellular coupling with improved chronotropy and synchrony.

Original languageEnglish
JournalJournal of Heart and Lung Transplantation
DOIs
Publication statusAccepted/In press - 2017

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Keywords

  • Cardiomyocytes
  • Cardiovascular disease
  • Embryonic stem cells
  • Endothelial cells
  • Vascular niche

ASJC Scopus subject areas

  • Surgery
  • Pulmonary and Respiratory Medicine
  • Cardiology and Cardiovascular Medicine
  • Transplantation

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