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• W258100382 abstract "The development of regenerative therapies using derivatives of embryonic stem (ES) cells would be facilitated by a non-invasive method to monitor transplanted cells in vivo, for example, magnetic resonance imaging of cells labeled with superparamagnetic iron oxide (SPIO) nanoparticles. Although ES cells have been labeled with SPIO particles, the potential adverse effects of the label have not been fully examined. The objective of this study was to determine whether SPIO labeling affects murine ES cell viability, proliferation, or ability to differentiate into functional endothelial cells (ECs).Cross-linked iron oxide (CLIO, an SPIO) was conjugated with human immunodeficiency virus transactivator of transcription (HIV-Tat) peptides, and murine ES cells were labeled with either CLIO-Tat, CLIO, or HIV-Tat. After labeling, ES cells were cultured for 4 days and Flk-1(+) ES cells identified and sorted by immunocytochemistry and fluorescence activated cell sorting (FACS). Flk-1(+) cells were replated on fibronectin-coated dishes, and ECs were obtained by culturing these for 4 weeks in endothelial cell growth medium supplemented with vascular endothelial growth factor (VEGF). ES cell viability was determined using trypan blue exclusion, and the proportion of SPIO(+) cells was evaluated using Prussian blue staining and transmission electron microscopy. After differentiation, the behavior and phenotype of ECs were analyzed by reverse transcription-polymerase chain reaction, flow cytometry, immunocytochemistry, DiI-labeled acetylated low-density lipoprotein (AcLDL) uptake, and Matrigel tube formation assay.CLIO-Tat was a highly effective label for ES cells, with > 96% of cells incorporating the particles, and it did not alter the viability of the labeled cells. ECs derived from CLIO-Tat(+) ES cells were very similar to murine aortic ECs in their morphology, expression of endothelial cell markers, ability to form vascular-like channels, and scavenging of AcLDL from the culture medium.CLIO-Tat is a highly effective label for ES cells and does not adversely affect cell viability, differentiation, or behavior. CLIO-Tat could be a useful marker for the non-invasive monitoring of transplanted stem cells." @default.
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• W258100382 date "2011-01-01" @default.
• W258100382 modified "2023-09-27" @default.
• W258100382 title "Functional endothelial cells derived from embryonic stem cells labeled with HIV transactivator peptide-conjugated superparamagnetic nanoparticles." @default.
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