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Gadolinium Metallofullerene-Polypyrrole Nanoparticles for Activatable Dual-Modal Imaging-Guided Photothermal Therapy.
ACS Applied Materials & Interfaces 2018 August 30
Accurate diagnosis of tumor is promising to guide photothermal therapy (PTT) for efficacious tumor ablation with minimal damage to healthy tissues. Here, we report an activatable dual-modal imaging agent, which is based on PEGylated-gadolinium metallofullerene-polypyrrole nanoparticle (PEG-GMF-PPy NP) for imaging-guided PTT. A contrast agent (gadolinium metallofullerene, GMF) with excellent magnetic resonance imaging (MRI) performance and an ultra-pH-responsive polymer (PEG-PC7A) are successively modified to the surface of photothermal agent (PPy NP). The prepared PEG-GMF-PPy NPs show strong absorption in the near-infrared (NIR) region, so they can be utilized for photoacoustic imaging. Furthermore, in a tumor extracellular environment, the PEG-GMF-PPy NPs can achieve pH-enhanced MRI because of the hydrophobic-to-hydrophilic conversion of the PC7A. Upon accurate diagnosis-guided NIR laser irradiation, excellent tumor ablation effect is achieved. The results suggest that the PEG-GMF-PPy NPs are promising agents for activatable imaging-guided PTT.
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