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Combined Magnetic Resonance Imaging and Photodynamic Therapy Using Polyfunctionalised Nanoparticles Bearing Robust Gadolinium Surface Units
Author(s) -
Chabloz Nicolas G.,
Perry Hannah L.,
Yoon IlChul,
Coulson Andrew J.,
White Andrew J. P.,
Stasiuk Graeme J.,
Botnar René M.,
WiltonEly James D. E. T.
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904757
Subject(s) - gadolinium , biocompatibility , photodynamic therapy , nanoparticle , hela , conjugated system , materials science , colloidal gold , nanotechnology , chemistry , biophysics , in vitro , organic chemistry , polymer , biochemistry , biology
A robust dithiocarbamate tether allows novel gadolinium units based on DOTAGA ( q =1) to be attached to the surface of gold nanoparticles (2.6–4.1 nm diameter) along with functional units offering biocompatibility, targeting and photodynamic therapy. A dramatic increase in relaxivity ( r 1 ) per Gd unit from 5.01 m m −1 s −1 in unbound form to 31.68 m m −1 s −1 (10 MHz, 37 °C) is observed when immobilised on the surface due to restricted rotation and enhanced rigidity of the Gd complex on the nanoparticle surface. The single‐step synthetic route provides a straightforward and versatile way of preparing multifunctional gold nanoparticles, including examples with conjugated zinc–tetraphenylporphyrin photosensitizers. The lack of toxicity of these materials (MTT assays) is transformed on irradiation of HeLa cells for 30 minutes (PDT), leading to 75 % cell death. In addition to passive targeting, the inclusion of units capable of actively targeting overexpressed folate receptors illustrates the potential of these assemblies as targeted theranostic agents.