Abstract
Stem cell-based therapies are considered to be promising and innovative therapeutic strategies for heart repair. Patient-derived induced pluripotent stem cells (iPSCs) are now available, which combine the advantages of autologous adult stem cells with the unlimited potential of embryonic stem cells for proliferation and differentiation. Intense research has driven dramatic progress in various areas of iPSC technology relevant for clinically applicable iPSC-based cellular therapies. At this point, it is already possible to generate transgene-free autologous iPSCs from small blood samples or hair, to scale up the expansion and differentiation of iPSCs to clinically required dimensions, and to obtain highly enriched cardiomyocyte preparations. On the other hand, critical hurdles such as the targeted specification of distinct cardiomyocyte subpopulations, survival and proper functional integration of cellular transplants after myocardial infarction, and in vitro engineering of prevascularized muscle patches have yet to be overcome. Nevertheless, concepts of cellular cardiomyoplasty seem to have come of age and the first clinical applications of iPSC-based heart repair can be expected within the coming years.
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