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• W2017207175 abstract "Abstract Advances in the biology of stem cells have evoked great interest in cell replacement therapies for the regeneration of heart tissue after myocardial infarction. However, results from human trials are controversial, since the destination of the injected cells, their engraftment and their long‐term fate have remained unclear. Here we investigate whether transplanted cells can be identified in the intact and lesioned murine myocardium employing high‐resolution MRI. Cardiac progenitor cells, expressing the enhanced green fluorescent protein (EGFP), were labeled with ultra‐small paramagnetic iron‐oxide (USPIO) nanoparticles and transplanted into the intact or injured myocardium of mice. Their precise location was determined with high‐resolution MRI and compared with histological tissue sections, stained with Prussian blue for iron content. These experiments showed that iron nanoparticle‐loaded cells could be identified at high resolution in the mouse heart. However, ischemic myocardium (after cryoinjury or left coronary artery ligation) was characterized by a signal attenuation similar to that induced by USPIO‐labeled cells in T ‐weighted MR images, making detection of labeled stem cells in this area by T ‐sensitive contrast rather difficult. In animals with myocardial injury only, the signal attenuated areas were of the same size in proton density‐ and T ‐weighted MR images. In injured animals also receiving labeled cells the lesioned area appeared larger in T ‐ than in proton density‐weighted MR images. This sequence‐dependent lesion size change is due to the increased signal loss caused by the iron oxide nanoparticles, most sensitively detectable in the T ‐sensitive images. Thus, using the novel combination of these two parameter weightings, USPIO‐labeled cells can be detected at high resolution in ischemic myocardium. Copyright © 2005 John Wiley & Sons, Ltd." @default.
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• W2017207175 date "2005-06-10" @default.
• W2017207175 modified "2023-10-17" @default.
• W2017207175 title "Stem cell implantation in ischemic mouse heart: a high-resolution magnetic resonance imaging investigation" @default.
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• W2017207175 doi "https://doi.org/10.1002/nbm.967" @default.
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