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• W1545869722 abstract "In various stem cell therapy approaches poor cell survival has been recognized as an important factor limiting therapeutic efficacy. Therefore noninvasive monitoring of cell fate is warranted for developing clinically effective stem cell therapy. In this study we investigated the use of voxel‐based R 2 mapping as a tool to monitor the fate of iron oxide‐labeled cells in the myocardium. Mesenchymal stem cells were transduced with the luciferase gene, labeled with ferumoxide particles and injected in the myocardium of healthy rats. Cell fate was monitored over a period of 8 weeks by bioluminescence and quantitative magnetic resonance imaging. Bioluminescence signal increased during the first week followed by a steep decrease to undetectable levels during the second week. MR imaging showed a sharp increase in R 2 values shortly after injection at the injection site, followed by a very gradual decrease of R 2 over a period of 8 weeks. No difference in the appearances on R 2 ‐weighted images was observed between living and dead cells over the entire time period studied. No significant correlation between the bioluminescence optical data and R 2 values was observed and quantitative R 2 mapping appeared not suitable for the in vivo assessment of stem cell. These results do not follow previous in vitro reports where it was proposed that living cells may be distinguished from dead cells on the basis of the R 2 relaxivities (intracellular and extracellular iron oxides). Cell proliferation, cell migration, cell death, extracellular superparamagnetic iron oxide dispersion and aggregation exhibit different relaxivities. In vivo these processes happen simultaneously, making quantification very complex, if not impossible. Copyright © 2013 John Wiley & Sons, Ltd." @default.
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• W1545869722 date "2013-11-01" @default.
• W1545869722 modified "2023-09-25" @default.
• W1545869722 title "<i>In vivo</i>MRI mapping of iron oxide-labeled stem cells transplanted in the heart" @default.
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• W1545869722 doi "https://doi.org/10.1002/cmmi.1582" @default.
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