Abstract
Mesenchymal stem cells (MSCs) have generated a great deal of promise as a potential source of cells for cell-based therapies. Various labeling techniques have been developed to trace MSC survival, migration, and behavior in vitro or in vivo. In the present study, we labeled MSCs derived from rat bone marrow (rMSCs) with florescent membrane dyes PKH67 and DiI, and with nuclear labeling using 5 μM BrdU and 10 μM BrdU. The cells were then cultured for 6 d or passaged (1–3 passages). The viability of rMSCs, efficacy of fluorescent expression, and transfer of the dyes were assessed. Intense fluorescence in rMSCs was found immediately after membrane labeling (99.3 ± 1.6% PKH67+ and 98.4 ± 1.7% DiI+) or after 2 d when tracing of nuclei was applied (91.2 ± 4.6% 10 μM BrdU+ and 77.6 ± 4.6% 5 μM BrdU+), which remained high for 6 d. Viability of labeled cells was 91 ± 3.8% PKH67+, 90 ± 1.5% DiI+, 91 ± 0.8% 5 μM BrdU+, and 76.9 ± 0.9% 10 μM BrdU+. The number of labeled rMSCs gradually decreased during the passages, with almost no BrdU+ nuclei left at final passage 3. Direct cocultures of labeled rMSCs (PKH67+ or DiI+) with unlabeled rMSCs revealed almost no dye transfer from donor to unlabeled recipient cells. Our results confirm that labeling of rMSCs with PKH67 or DiI represents a non-toxic, highly stable, and efficient method suitable for steady tracing of cells, while BrdU tracing is more appropriate for temporary labeling due to decreasing signal over time.
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This work was supported by grant project VEGA 2/0169/13, APVV-0472-11.
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Editor: T. Okamoto
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Nagyova, M., Slovinska, L., Blasko, J. et al. A comparative study of PKH67, DiI, and BrdU labeling techniques for tracing rat mesenchymal stem cells. In Vitro Cell.Dev.Biol.-Animal 50, 656–663 (2014). https://doi.org/10.1007/s11626-014-9750-5
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DOI: https://doi.org/10.1007/s11626-014-9750-5