In Vitro and In Vivo Magnetic Resonance Tracking of Sinerem-Labeled Human Umbilical Mesenchymal Stromal Cell-Derived Schwann Cells
Tóm tắt
Tracking of ultrasmall superparamagnetic iron oxide (USPIO) nanoparticles-labeled embryonic stem cells, neural stem cells, or adult mesenchymal stem cells in vitro and in vivo by using magnetic resonance (MR) imaging have been reported. However, whether the transdifferentiated cells can be effectively labeled by USPIO has not yet been investigated. The requirement for nerve donor material evokes additional morbidity and inability to generate a sufficiently large number of cells in a short time to hamper the clinic application of Schwann cells (SCs) transplantation. These limitations may be avoided if SCs can be generated from clinically accessible sources, such as bone marrow and umbilical cord. However, a reliable means of inducing the selective differentiation of human mesenchymal stromal cells isolated from the umbilical cord (HUMSCs) into SCs in vitro has not yet been established. In this study, we induce HUMSCs into Schwann-like cells in terms of morphology, phenotype, and function by an improved protocol basing on our previous studies. Furthermore, HUMSCs-derived SCs are labeled efficiently in vitro with ultrasmall superparamagnetic iron oxide contrast agent (USPIO) Sinerem and poly-l-lysine (PLL) without affecting morphology, cell cycle, proliferation, and differentiation ability of the labeled cells between the concentration of 200 to 800 μg/ml. Importantly, when grafted into the intact cerebral cortex and striatum, the survival and migration of these Sinerem-labeled cells were observed using MRI. Our study suggest the effective concentration field for Sinerem use in tracking transdifferentiated HUMSCs, and Sinerem labeling transdifferentiated HUMSCs is feasible, efficient, and safe for MRI tracing following grafting into nervous system.
Tài liệu tham khảo
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