title: Cardiac myocytes derived from murine reprogrammed fibroblasts: intact hormonal regulation, cardiac ion channel expression and development of contractility.
abstract: OBJECTIVE
  Induced pluripotent stem (iPS) cells have a developmental potential similar to that of blastocyst-derived embryonic stem (ES) cells and may serve as an autologous source of cells for tissue repair, in vitro disease modelling and toxicity assays. Here we aimed at generating iPS cell-derived cardiomyocytes (CMs) and comparing their molecular and functional characteristics with CMs derived from native murine ES cells.
  
  
  RESULTS
  Beating cardiomyocytes were generated using a mass culture system from murine N10 and O9 iPS cells as well as R1 and D3 ES cells. Transcripts of the mesoderm specification factor T-brachyury and non-atrial cardiac specific genes were expressed in differentiating iPS EBs. Using immunocytochemistry to determine the expression and intracellular organisation of cardiac specific structural proteins we demonstrate strong similarity between iPS-CMs and ES-CMs. In line with a previous study electrophysiological analyses showed that hormonal response to beta-adrenergic and muscarinic receptor stimulation was intact. Action potential (AP) recordings suggested that most iPS-CMs measured up to day 23 of differentiation are of ventricular-like type. Application of lidocaine, Cs+, SEA0400 and verapamil+ nifedipine to plated iPS-EBs during multi-electrode array (MEA) measurements of extracellular field potentials and intracellular sharp electrode recordings of APs revealed the presence of I(Na), I(f), I(NCX), and I(CaL), respectively, and suggested their involvement in cardiac pacemaking, with I(CaL) being of major importance. Furthermore, iPS-CMs developed and conferred force to avitalized ventricular tissue that was responsive to beta-adrenergic stimulation.
  
  
  CONCLUSIONS
  Our data demonstrate that the cardiogenic potential of iPS cells is comparable to that of ES cells and that iPS-CMs possess all fundamental functional elements of a typical cardiac cell, including spontaneous beating, hormonal regulation, cardiac ion channel expression and contractility. Therefore, iPS-CMs can be regarded as a potentially valuable source of cells for in vitro studies and cellular cardiomyoplasty.
authors: Institute for Neurophysiology, University of Cologne, Germany.
authors: Kurt
authors: K
authors: Pfannkuche
authors: Huamin
authors: H
authors: Liang
authors: Tobias
authors: T
authors: Hannes
authors: Jiaoya
authors: J
authors: Xi
authors: Azra
authors: A
authors: Fatima
authors: Filomain
authors: F
authors: Nguemo
authors: Matthias
authors: M
authors: Matzkies
authors: Marius
authors: M
authors: Wernig
authors: Rudolf
authors: R
authors: Jaenisch
authors: Frank
authors: F
authors: Pillekamp
authors: Marcel
authors: M
authors: Halbach
authors: Heribert
authors: H
authors: Schunkert
authors: Tomo
authors: T
authors: Sarić
authors: Juergen
authors: J
authors: Hescheler
authors: Michael
authors: M
authors: Reppel
mesh_terms: D000200:Action Potentials / Q000502:physiology; D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D000818:Animals; D002454:Cell Differentiation; D053595:Embryonic Stem Cells / Q000166:cytology; D005347:Fibroblasts / Q000166:cytology; D005786:Gene Expression Regulation; D007473:Ion Channels / Q000378:metabolism*; D051379:Mice; D009200:Myocardial Contraction; D032383:Myocytes, Cardiac / Q000166:cytology* / Q000502:physiology; D039904:Pluripotent Stem Cells / Q000166:cytology*; D011943:Receptors, Adrenergic, beta / Q000378:metabolism*; D011976:Receptors, Muscarinic / Q000378:metabolism; D023822:Tissue Engineering
chemical_list: D000318:Adrenergic beta-Agonists; D007473:Ion Channels; D011943:Receptors, Adrenergic, beta; D011976:Receptors, Muscarinic