Abstract
The adult human heart has limited regenerative capacity; hence, stem cell therapy has been investigated as a potential approach for cardiac repair. However, a large part of the benefit of the injection of stem and progenitor cells into injured hearts is mediated by secreted factors. Exosomes-nano-sized secreted extracellular vesicles of endosomal origin-have emerged as key signaling organelles in intercellular communication, and are now viewed as the key regenerative constituent of the secretome of stem and progenitor cells. Exosomes released from mesenchymal stem cells, cardiac-derived progenitor cells, embryonic stem cells, induced pluripotent stem cells (iPSCs), and iPSC-derived cardiomyocytes exhibit cardioprotective, immunomodulatory, and reparative abilities. This concise review discusses the therapeutic benefit of exosomes secreted by stem and progenitor cells in preclinical models of ischemic heart disease.
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