Synthesis Of Heteronanostructures For Multimodality Molecular Imaging-Guided Photothermal Therapy
JOURNAL OF MATERIALS CHEMISTRY B(2020)
摘要
Combining photothermal therapy (PTT) and multimodality molecular imaging into one nanotheranostic can improve the diagnostics and therapeutics outcome of malignant tumors significantly. Herein, a heteronanostructure (named Au-Fe3O4@PDA-PEG-DTPA-Gd) has been synthesized for multimodality molecular imaging-guided PTT by conjugation of gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA) on a polydopamine (PDA) coated Au-Fe3O4 heterodimeric via a polyethylene glycol (PEG) crosslinker. Au-Fe3O4@PDA-PEG-DTPA-Gd exhibits reasonable biocompatibility, high photothermal conversion efficiency (eta = 41.3%), integration of excellent T-1-/T-2-weighted magnetic resonance imaging (MRI, the molar longitudinal relaxivity rate (r(1)) = 6.14 mM(-1) s(-1)/transverse relaxation rate (r(2)) = 71.88 mM(-1) s(-1)) and X-ray computed tomography imaging (CT, approximately 1.94 times higher than that of the commercial CT contrast agent ioversol) contrast functionality. The theranostic capability of Au-Fe3O4@PDA-PEG-DTPA-Gd has been verified on the triple negative breast tumor cell (MDA-MB-231 cell) and MDA-MB-231 tumor-bearing mouse model. From MR/CT imaging, Au-Fe3O4@PDA-PEG-DTPA-Gd shows remarkable PTT efficacy, which completely inhibits MDA-MB-231 tumor growth in vivo with a single treatment.
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