期刊
PLOS ONE
卷 9, 期 2, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0088685
关键词
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资金
- National Institutes of Health [R37-HL-074272, HL-095375, HL-087246]
- National Natural Science Foundation of China [81120108003]
- National Key Basic Research Program of China [2012CB526602]
Mesenchymal stem cells (MSCs) have potential application for the treatment of ischemic heart diseases. Besides differentiation properties, MSCs protect ischemic cardiomyocytes by secretion of paracrine factors. In this study, we found exosomes enriched with miR-22 were secreted by MSCs following ischemic preconditioning (Exo(IPC)) and mobilized to cardiomyocytes where they reduced their apoptosis due to ischemia. Interestingly, by time-lapse imaging, we for the first time captured the dynamic shedding of miR-22 loaded exosomes from cytosol to extracellular space. Furthermore, the antiapoptotic effect of miR-22 was mediated by direct targeting of methyl CpG binding protein 2 (Mecp2). In vivo data showed that delivery of Exo(IPC) significantly reduced cardiac fibrosis. Our data identified a significant benefit of Exo(IPC) for the treatment of cardiac diseases by targeting Mecp2 via miR-22.
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