Abstract:
BACKGROUND AIMS:Mesenchymal stromal cells (MSC) are the focus of research in regenerative medicine aiming at the regulatory approval of these cells for specific indications. To cope with the regulatory requirements for somatic cell therapy, novel approaches that do not interfere with the natural behavior of the cells are necessary. In this context in vivo magnetic resonance imaging (MRI) of labeled MSC could be an appropriate tool. Cell labeling for MRI with a variety of different iron oxide preparations is frequently published. However, most publications lack a comprehensive assessment of the non-interference of the contrast agent with the functionality of the labeled MSC, which is a prerequisite for the validity of cell-tracking via MRI. METHODS:We studied the effects of iron oxide-poly(l-lactide) nanoparticles in MSC with flow cytometry, transmission electron microscopy (TEM), confocal laser scanning microscopy (CLSM), Prussian blue staining, CyQuant® proliferation testing, colony-forming unit-fibroblast (CFU-F) assays, flow chamber adhesion testing, immunologic tests and differentiation tests. Furthermore iron-labeled MSC were studied by MRI in agarose phantoms and Wistar rats. RESULTS:It could be demonstrated that MSC show rapid uptake of nanoparticles and long-lasting intracellular persistence in the endosomal compartment. Labeling of the MSC with these particles has no influence on viability, differentiation, clonogenicity, proliferation, adhesion, phenotype and immunosuppressive properties. They show excellent MRI properties in agarose phantoms and after subcutaneous implantation in rats over several weeks. CONCLUSIONS:These particles qualify for studying MSC homing and trafficking via MRI.
journal_name
Cytotherapyjournal_title
Cytotherapyauthors
Schmidtke-Schrezenmeier G,Urban M,Musyanovych A,Mailänder V,Rojewski M,Fekete N,Menard C,Deak E,Tarte K,Rasche V,Landfester K,Schrezenmeier Hdoi
10.3109/14653249.2011.571246subject
Has Abstractpub_date
2011-09-01 00:00:00pages
962-75issue
8eissn
1465-3249issn
1477-2566pii
S1465-3249(11)70577-1journal_volume
13pub_type
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