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MRI reveals slow clearance of dead cell transplants in mouse forelimb muscles.
Molecular Medicine Reports 2017 October
A small molecule tetraazacyclododecane-1,4,7,10-tetraacetic acid (Gd‑DOTA)4‑TPP agent is used to label human mesenchymal stem cells (hMSCs) via electroporation (EP). The present study assessed the cytotoxicity of cell labeling, in addition to its effect on cell differentiation potential. There were no significant adverse effects on cell viability or differentiation induced by either EP or cellular uptake of (Gd‑DOTA)4‑TPP. Labeled live and dead hMSCs were transplanted into mouse forelimb muscles. T2‑weighted magnetic resonance imaging (MRI) was used to track the in vivo fate of the cell transplants. The labeling and imaging strategy allowed long term tracking of the cell transplants and unambiguous distinguishing of the cell transplants from their surrounding tissues. Cell migration was observed for live hMSCs injected into subcutaneous tissues, however not for either live or dead hMSCS injected into limb muscles. A slow clearance process occurred of the dead cell transplants in the limb muscular tissue. The MRI results therefore reveal that the fate and physiological activities of cell transplants depend on the nature of their host tissue.
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