RÉSUMÉ
Induced pluripotent stem cells (iPSCs) are promising cell source for cardiac tissue engineering and cell based therapies for heart repair as they can be expanded in vitro and differentiated into most cardiovascular cell types, including cardiomyocytes. During embryonic heart development, this differentiation occurs under the influence of internal and external stimuli that guide cells to go down the cardiac lineage. The aim of this study was to characterize the cardiac differentiation potential of a canine iPS cell. With the use of a standard embryoid body–based differentiation protocol for iPS cells were differentiated for 24 days. In vitro differentiations of canine iPSCs via embryoid bodies (EBs) were produced by ‘Hanging Drop’ method. EB’s were differentiated using 5-azacytidine (5-Aza). During differentiation, EBs were collected on day 4, 6, 8, 12, 16, 20 and 24 to evaluate the expression of cardiomyocyte specific marker. Analyses on molecular, structural, and functional levels demonstrated that iPS cell– derived cardiomyocytes show typical features of ES cell– derived cardiomyocytes. Reverse transcription polymerase chain reaction analyses demonstrated expression of marker genes. The differentiated cells expressed cardiac-specific gene myosin light chain 2 (MYL2) which started from day 8 of differentiation and highest expression was observed on day 16. Immunocytochemistry and relative expression of cardiac specific genes revealed that iPS cells differentiate into functional cardiomyocytes and allow to derivation of autologous functional cardiomyocytes for cellular cardiomyoplasty and myocardial tissue engineering