Capacity of human monocytes to phagocytose approved iron oxide MR contrast agents in vitro |
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Authors: | Email author" target="_blank">Stephan?MetzEmail author Gabriel?Bonaterra Martina?Rudelius Marcus?Settles Ernst?J?Rummeny Heike?E?Daldrup-Link |
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Institution: | (1) Department of Diagnostic Radiology, Technical University Munich, 81675 Munich, Germany;(2) Institute of Anatomy and Cell Biology, Ruprecht-Karls-University, Heidelberg, Germany;(3) Department of Pathology, Technical University Munich, 81675 Munich, Germany |
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Abstract: | To evaluate the capacity of human monocytes to phagocytose various approved iron oxide based magnetic resonance (MR) contrast agents and to optimize in vitro labeling of these cells. Human monocytes were incubated with two superparamagnetic iron oxide particles (SPIO) as well as two ultrasmall SPIO (USPIO) at varying iron oxide concentrations and incubation times. Iron uptake in monocytes was proven by histology, quantified by atomic emission absorption spectrometry and depicted with T2* weighted fast field echo (FFE) MR images at 1.5 T. Additionally, induction of apoptosis in iron oxide labeled monocytes was determined by YO-PRO-1 staining. Cellular iron uptake was significantly (P<0.01) higher after incubation with SPIO compared with USPIO. For SPIO, the iron oxide uptake was significantly (P<0.01) higher after incubation with the ionic Ferucarbotran as compared with the non-ionic Ferumoxides. Efficient cell labeling was achieved after incubation with Ferucarbotran at concentrations 500 g Fe/ml and incubation times 1 h, resulting in a maximal iron oxide uptake of up to 50 pg Fe/cell without impairment of cell viability. In vitro labeling of human monocytes for MR imaging is most effectively obtained with the approved SPIO Ferucarbotran. Potential subsequent in vivo cell tracking applications comprise, e.g. specific targeting of inflammatory processes. |
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Keywords: | Monocytes Cell labeling Iron oxides Nanoparticles MR imaging |
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