title: Superparamagnetic iron oxide nanoparticles for direct labeling of stem cells and in vivo MRI tracking.
abstract: To develop effective stem cell therapies, it is important to track therapeutic cells non-invasively and monitor homing to areas of pathology. The purpose of this study was to design and evaluate the labeling efficiency of commercially available dextran-coated superparamagnetic iron oxide nanoparticles, FeraTrack Direct (FTD), in various stem and immune cells; assess the cytotoxicity and tolerability of the FTD in stem cells; and monitor stem cell homing using FTD-labeled bone-marrow-derived mesenchymal stromal cells (BMSCs) and neural stem cells (NSCs) in a tumor model by in vivo MRI. BMSCs, NSCs, hematopoietic stem cells (HSCs), T-lymphocytes, and monocytes were labeled effectively with FTD without the need for transfection agents, and Prussian blue (PB) staining and transmission electron microscopy (TEM) confirmed intracellular uptake of the agent. The viability, proliferation, and functionality of the labeled cells were minimally or not affected after labeling. When 10(6) FTD-labeled BMSCs or NSCs were injected into C6 glioma bearing nude mice, the cells homing to the tumors were detected as hypointense regions within the tumor using 3 T clinical MRI up to 10 days post injection. Histological analysis confirmed the homing of injected cells to the tumor by the presence of PB positive cells that are not macrophages. Labeling of stem cells or immune cells with FTD was non-toxic, and should facilitate the translation of this agent to clinical trials for evaluation of trafficking of cells by MRI.
authors.affiliation: Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, MD, USA.
authors.forename: Saejeong J
authors.initials: SJ
authors.lastname: Kim
authors.affiliation: Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, MD, USA.
authors.forename: Bobbi
authors.initials: B
authors.lastname: Lewis
authors.affiliation: Miltenyi Biotec, Bergisch Gladbach, Germany.
authors.forename: Mark-Steven
authors.initials: MS
authors.lastname: Steiner
authors.affiliation: Miltenyi Biotec, Bergisch Gladbach, Germany.
authors.forename: Ursula V
authors.initials: UV
authors.lastname: Bissa
authors.affiliation: Miltenyi Biotec, Bergisch Gladbach, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Dose
authors.affiliation: Frank Laboratory, Radiology and Imaging Sciences, Clinical Center, National Institutes of Health, Bethesda, MD, USA.|Intramural Research Program, National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, MD, USA.
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Frank
mesh_terms: D000818:Animals; D049109:Cell Proliferation; D058948:Cell Tracking; D005290:Ferric Compounds / Q000737:chemistry*; D006412:Hematopoietic Stem Cells / Q000737:chemistry / Q000648:ultrastructure; D008279:Magnetic Resonance Imaging; D058185:Magnetite Nanoparticles / Q000737:chemistry; D059630:Mesenchymal Stem Cells / Q000737:chemistry / Q000648:ultrastructure; D051379:Mice; D046529:Microscopy, Electron, Transmission; D013194:Staining and Labeling
chemical_list: D005290:Ferric Compounds; D058185:Magnetite Nanoparticles; C000499:ferric oxide
keywords: bone marrow stromal cells; dextran; hematopoietic stem; neural stem cells; superparamagnetic iron oxide nanoparticles; transfection reagent free or direct labeling