Innovative Magnetic Nanoparticles for PET/MRI Bimodal Imaging

Abstract : Superparamagnetic iron oxide nanoparticles were developed as positron emission tomography (PET) and magnetic resonance imaging (MRI) bimodal imaging agents. These nanoparticles (NPs), with a specific nanoflower morphology, were first synthesized and simultaneously functionalized with 3,4-dihydroxy-l-phenylalanine (LDOPA) under continuous hydrothermal conditions. The resulting NPs exhibited a low hydrodynamic size of 90 ± 2 nm. The functional groups of LDOPA (-NH2 and -COOH) were successfully used for the grafting of molecules of interest in a second step. The nanostructures were modified by poly(ethylene glycol) (PEG) and a new macrocyclic chelator MANOTA for further ⁶⁴Cu radiolabeling for PET imaging. The functionalized NPs showed promising bimodal (PET and MRI) imaging capability with high r2 and r2∗ (T2 and T2∗ relaxivities) values and good stability. They were mainly uptaken from liver and kidneys. No cytotoxicity effect was observed. These NPs appear as a good candidate for bimodal tracers in PET/MRI.
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Submitted on : Friday, March 15, 2019 - 10:27:02 AM
Last modification on : Monday, October 21, 2019 - 3:35:36 PM

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Guillaume Thomas, Julien Boudon, Lionel Maurizi, Mathieu Moreau, Paul Walker, et al.. Innovative Magnetic Nanoparticles for PET/MRI Bimodal Imaging. ACS Omega, ACS Publications, 2019, 4 (2), pp.2637-2648. ⟨10.1021/acsomega.8b03283⟩. ⟨hal-02068644⟩

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