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Nano Lett. 2019 Nov 13;19(11):7908-7917. doi: 10.1021/acs.nanolett.9b03016. Epub 2019 Oct 2.

Introducing Specificity to Iron Oxide Nanoparticle Imaging by Combining 57Fe-Based MRI and Mass Spectrometry.

Author information

1
Translational Research Imaging Center, Institute of Clinical Radiology , University Hospital Muenster , 48149 Muenster , Germany.
2
Institute for Inorganic and Analytical Chemistry, University of Muenster , 48149 Muenster , Germany.
3
nanoPET Pharma GmbH , 10115 Berlin , Germany.
4
Institute for Musculoskeletal Medicine , University Hospital Muenster , 48149 Muenster , Germany.
5
Institute of Pathology , University Hospital Muenster , 48149 Muenster , Germany.
6
DFG Cluster of Excellence EXC 1003 "Cells in Motion" , University of Muenster , 48149 Muenster , Germany.

Abstract

Iron 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.

KEYWORDS:

MRI; cell tracking; iron oxide nanoparticles; long-term fate; mass spectrometry

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