title: High-resolution electrophysiological assessment of human embryonic stem cell-derived cardiomyocytes: a novel in vitro model for the study of conduction.
abstract: The goal of the present report was to establish a new in vitro model for the study of impulse propagation in human cardiac tissue. By using the human embryonic stem cell differentiating system, spontaneously contracting areas were generated in three-dimensional differentiating cell aggregates (embryoid bodies). Morphological analysis revealed an isotropic tissue of early-stage cardiac phenotype. Gap junctions, assessed by immunostaining of connexin43 and connexin45, were distributed along the cell borders. High-resolution activation maps demonstrated the presence of a functional syncytium with stable focal activation and conduction properties. Conduction was significantly slower in narrow bands of contracting tissue compared with broad cardiomyocyte regions. Establishment of this unique in vitro human model may be used for the assessment of long-term structure-function relationships, for pharmacological studies, for tissue engineering, and may permit the study of genetically modified cardiomyocytes.
authors.affiliation: Cardiovascular Research Laboratory, the Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel.
authors.forename: Izhak
authors.initials: I
authors.lastname: Kehat
authors.forename: Amira
authors.initials: A
authors.lastname: Gepstein
authors.forename: Alon
authors.initials: A
authors.lastname: Spira
authors.forename: Joseph
authors.initials: J
authors.lastname: Itskovitz-Eldor
authors.forename: Lior
authors.initials: L
authors.lastname: Gepstein
mesh_terms: D000200:Action Potentials; D002454:Cell Differentiation; D002478:Cells, Cultured; D017630:Connexins / Q000032:analysis; D004594:Electrophysiology / Q000379:methods*; D004622:Embryo, Mammalian / Q000166:cytology*; D017629:Gap Junctions / Q000737:chemistry; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D008839:Microelectrodes; D008955:Models, Cardiovascular; D009206:Myocardium / Q000737:chemistry / Q000166:cytology; D012680:Sensitivity and Specificity; D013234:Stem Cells / Q000502:physiology*
chemical_list: D017630:Connexins