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Stem Cell Res. 2010 May;4(3):214-22. doi: 10.1016/j.scr.2009.12.003. Epub 2010 Jan 4.

Exosome secreted by MSC reduces myocardial ischemia/reperfusion injury.

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  • 1Institute of Medical Biology, ASTAR, 138648 Singapore.

Abstract

Human ESC-derived mesenchymal stem cell (MSC)-conditioned medium (CM) was previously shown to mediate cardioprotection during myocardial ischemia/reperfusion injury through large complexes of 50-100 nm. Here we show that these MSCs secreted 50- to 100-nm particles. These particles could be visualized by electron microscopy and were shown to be phospholipid vesicles consisting of cholesterol, sphingomyelin, and phosphatidylcholine. They contained coimmunoprecipitating exosome-associated proteins, e.g., CD81, CD9, and Alix. These particles were purified as a homogeneous population of particles with a hydrodynamic radius of 55-65 nm by size-exclusion fractionation on a HPLC. Together these observations indicated that these particles are exosomes. These purified exosomes reduced infarct size in a mouse model of myocardial ischemia/reperfusion injury. Therefore, MSC mediated its cardioprotective paracrine effect by secreting exosomes. This novel role of exosomes highlights a new perspective into intercellular mediation of tissue injury and repair, and engenders novel approaches to the development of biologics for tissue repair.

PMID:
20138817
DOI:
10.1016/j.scr.2009.12.003
[PubMed - indexed for MEDLINE]
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