Chelator free gallium-68 radiolabelling of silica coated iron oxide nanorods via surface interactions - Université de Bretagne Occidentale Access content directly
Journal Articles Nanoscale Year : 2015

Chelator free gallium-68 radiolabelling of silica coated iron oxide nanorods via surface interactions

Abstract

The commercial availability of combined magnetic resonance imaging (MRI)/positron emission tomography (PET) scanners for clinical use has increased demand for easily prepared agents which offer signal or contrast in both modalities. Herein we describe a new class of silica coated iron–oxide nanorods (NRs) coated with polyethylene glycol (PEG) and/or a tetraazamacrocyclic chelator (DO3A). Studies of the coated NRs validate their composition and confirm their properties as in vivo T2 MRI contrast agents. Radiolabelling studies with the positron emitting radioisotope gallium-68 (t1/2 = 68 min) demonstrate that, in the presence of the silica coating, the macrocyclic chelator was not required for preparation of highly stable radiometal-NR constructs. In vivo PET-CT and MR imaging studies show the expected high liver uptake of gallium-68 radiolabelled nanorods with no significant release of gallium-68 metal ions, validating our innovation to provide a novel simple method for labelling of iron oxide NRs with a radiometal in the absence of a chelating unit that can be used for high sensitivity liver imaging.

Dates and versions

hal-01537630 , version 1 (12-06-2017)

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Benjamin P. Burke, Neazar Baghdadi, Alicja E. Kownacka, Shubhanchi Nigam, Goncalo S. Clemente, et al.. Chelator free gallium-68 radiolabelling of silica coated iron oxide nanorods via surface interactions. Nanoscale, 2015, 7 (36), pp.14889 - 14896. ⟨10.1039/C5NR02753E⟩. ⟨hal-01537630⟩
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