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Communication
Open Access

CXCR4‐Targeted and MMP‐Responsive Iron Oxide Nanoparticles for Enhanced Magnetic Resonance Imaging

Juan Gallo

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ (UK)

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Nazila Kamaly

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ (UK)

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Ioannis Lavdas

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

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Elizabeth Stevens

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

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Quang‐De Nguyen

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

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Marzena Wylezinska‐Arridge

Biological Imaging Centre, Medical Research Council (MRC) Clinical Science Centre, Imperial College London, Du Cane Road, London, W12 0NN (UK)

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Eric O. Aboagye

Corresponding Author

E-mail address: e.aboagye@imperial.ac.uk

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)
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Nicholas J. Long

Corresponding Author

E-mail address: n.long@imperial.ac.uk

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)

Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ (UK)

Comprehensive Cancer Imaging Centre, Department of Surgery and Cancer, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN (UK)
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First published: 15 July 2014
Cited by: 58

Funding for this project was provided by CRUK, EPSRC, MRC and the Department of Health, grant (C2536/A10337).

Abstract

MRI offers high spatial resolution with excellent tissue penetration but it has limited sensitivity and the commonly administered contrast agents lack specificity. In this study, two sets of iron oxide nanoparticles (IONPs) were synthesized that were designed to selectively undergo copper‐free click conjugation upon sensing of matrix metalloproteinase (MMP) enzymes, thereby leading to a self‐assembled superparamagnetic nanocluster network with T2 signal enhancement properties. For this purpose, IONPs with bioorthogonal azide and alkyne surfaces masked by polyethylene glycol (PEG) layers tethered to CXCR4‐targeted peptide ligands were synthesized and characterized. The IONPs were tested in vitro and T2 signal enhancements of around 160 % were measured when the IONPs were incubated with cells expressing MMP2/9 and CXCR4. Simultaneous systemic administration of the bioorthogonal IONPs in tumor‐bearing mice demonstrated the signal‐enhancing ability of these ‘smart’ self‐assembling nanomaterials.

Number of times cited according to CrossRef: 58

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