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Cell-based therapies have emerged during the last decade in various clinical fields. Especially mesenchymal stromal cells (MSCs) have been used in pre-clinical and clinical applications in cardiovascular, neurodegenerative and musculoskeletal disorders. In order to validate survival and viability as well as possible engraftment of MSCs into the host tissue a live cell imaging technique is needed that allows non-invasive, temporal imaging of cellular kinetics as well as evaluation of cell viability after transplantation. In this study we used luciferase-based bioluminescence imaging (BLI) to investigate the survival of autologous MSCs transplanted into a severely crushed soleus muscle of the rats. Furthermore we compared local as well as intra-arterial (i.a.) administration of cells and analyzed if luciferase transduced MSCs depict the same characteristics in vitro as non-transduced MSCs. We could show that transduction of MSCs does not alter their in vitro characteristics, thus, transduced MSCs display the same differentiation, proliferation and migration capacity as non-transduced cells. Using BLI we could track MSCs transplanted into a crushed soleus muscle until day 7 irrespective of local or i.a.

In Vivo Bioluminescence Imaging – A Suitable Method to Track Mesenchymal Stromal Cells in a Skeletal Muscle Trauma§