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Nanoscale metal−organic frameworks for combined photodynamic & radiation therapy in cancer treatmentLiu, Jingjing; Yang, Yu; Zhu, Wenwen; Yi, Xuan; Dong, Ziliang; Xu, Xiaona; Chen, Meiwan; Yang, Kai; Lu, Guang; Jiang, Lixin; Liu, Zhuang
Biomaterials, 08/2016, Volume: 97Journal Article
Abstract Nanoscale metal organic frameworks (NMOFs) have shown great potential in biomedicine owing to their structural/chemical diversities, high molecular loading capacities, and intrinsic biodegradability. Herein, we report the rational design of a NMOF composed by hafnium (Hf4+ ) and tetrakis (4-carboxyphenyl) porphyrin (TCPP). In such Hf-TCPP NMOFs, while TCPP is a photosensitizer to allow photodynamic therapy (PDT), Hf4+ with strong X-ray attenuation ability could serve as a radio-sensitizer to enhance radiotherapy (RT). Those NMOFs with polyethylene glycol (PEG) coating show efficient tumor homing upon intravenous injection, and thus could be used for in vivo combined RT & PDT, achieving a remarkable anti-tumor effect. Importantly, Hf-TCPP NMOFs show efficient clearance from the mouse body, minimizing concerns regarding their possible long-term toxicity. Our work thus presents a new concept of developing multifunctional NMOFs as a biodegradable carrier-free system, in which both metal ions and organic ligands are fully utilized to exert their therapeutic functions.
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