Introducing Specificity to Iron Oxide Nanoparticle Imaging by Combining 57 Fe-Based MRI and Mass Spectrometry
2019; American Chemical Society; Volume: 19; Issue: 11 Linguagem: Inglês
10.1021/acs.nanolett.9b03016
ISSN1530-6992
AutoresMax Masthoff, Rebecca Buchholz, Andre Beuker, Lydia Wachsmuth, Alexander Kraupner, Franziska Albers, Felix Freppon, Anne Helfen, Mirjam Gerwing, Carsten Höltke, Uwe Hansen, Jan Rehkämper, Torsten Vielhaber, Walter Heindel, Michel Eisenblätter, Uwe Kärst, Moritz Wildgruber, Cornelius Faber,
Tópico(s)NMR spectroscopy and applications
ResumoIron oxide nanoparticles (ION) are highly sensitive probes for magnetic resonance imaging (MRI) that have previously been used for in vivo cell tracking and have enabled implementation of several diagnostic tools to detect and monitor disease. However, the in vivo MRI signal of ION can overlap with the signal from endogenous iron, resulting in a lack of detection specificity. Therefore, the long-term fate of administered ION remains largely unknown, and possible tissue deposition of iron cannot be assessed with established methods. Herein, we combine nonradioactive 57Fe-ION MRI with ex vivo laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) imaging, enabling unambiguous differentiation between endogenous iron (56Fe) and iron originating from applied ION in mice. We establish 57Fe-ION as an in vivo MRI sensor for cell tracking in a mouse model of subcutaneous inflammation and for assessing the long-term fate of 57Fe-ION. Our approach resolves the lack of detection specificity in ION imaging by unambiguously recording a 57Fe signature.
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