Cardiomyocyte differentiation of human induced pluripotent stem cells.
BACKGROUND
The ability to derive human induced pluripotent stem (hiPS) cell lines by reprogramming of adult fibroblasts with a set of transcription factors offers unique opportunities for basic and translational cardiovascular research. In the present study, we aimed to characterize the cardiomyocyte differentiation potential of hiPS cells and to study the molecular, structural, and functional properties of the generated hiPS-derived cardiomyocytes.


RESULTS
Cardiomyocyte differentiation of the hiPS cells was induced with the embryoid body differentiation system. Gene expression studies demonstrated that the cardiomyocyte differentiation process of the hiPS cells was characterized by an initial increase in mesoderm and cardiomesoderm markers, followed by expression of cardiac-specific transcription factors and finally by cardiac-specific structural genes. Cells in the contracting embryoid bodies were stained positively for cardiac troponin-I, sarcomeric alpha-actinin, and connexin-43. Reverse-transcription polymerase chain reaction studies demonstrated the expression of cardiac-specific sarcomeric proteins and ion channels. Multielectrode array recordings established the development of a functional syncytium with stable pacemaker activity and action potential propagation. Positive and negative chronotropic responses were induced by application of isoproterenol and carbamylcholine, respectively. Administration of quinidine, E4031 (I(Kr) blocker), and chromanol 293B (I(Ks) blocker) significantly affected repolarization, as manifested by prolongation of the local field potential duration.


CONCLUSIONS
hiPS cells can differentiate into myocytes with cardiac-specific molecular, structural, and functional properties. These results, coupled with the potential of this technology to generate patient-specific hiPS lines, hold great promise for the development of in vitro models of cardiac genetic disorders, for drug discovery and testing, and for the emerging field of cardiovascular regenerative medicine.
Sohnis Family Research Laboratory for Cardiac Electrophysiology and Regenerative Medicine, the Rappaport Family Institute for Research in the Medical Sciences, Technion-Israel Institute of Technology, Haifa, Israel.
Limor
L
Zwi
Oren
O
Caspi
Gil
G
Arbel
Irit
I
Huber
Amira
A
Gepstein
In-Hyun
IH
Park
Lior
L
Gepstein
D000328:Adult; D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D002460:Cell Line; D002478:Cells, Cultured; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology; D006801:Humans; D051379:Mice; D032383:Myocytes, Cardiac / Q000166:cytology* / Q000502:physiology*; D039904:Pluripotent Stem Cells / Q000166:cytology* / Q000502:physiology*