Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002369
Keywords
long-term oxygen storage; radiosensitization; tumor hypoxia
Categories
Funding
- Natural Science Foundation of China [21877049]
- Major Program for Tackling Key Problems of Industrial Technology in Guangzhou [201902020013]
- Dedicated Fund for Promoting High-Quality Marine Economic Development in Guangdong Province [GDOE-2019-A31]
- Guangzhou Key Laboratory of Molecular and Functional Imaging for Clinical Translation [201905010003]
- China Postdoctoral Science Foundation [2019M663366, 2016M600705]
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O-2-delivering nanosystems have been used to antagonize hypoxia-induced tumor therapeutic resistance. However, short-time oxygen storage is still a bottleneck for these O-2-delivering nanosystems, which results in a decrease in blood circulation time and accumulation of oxygen in tumors, thus reducing the tumor therapeutic efficacy. Herein, a long-term oxygen storage nanosystem (O-2-PIr@Si@PDA) is designed to overcome hypoxia for the treatment of nasopharyngeal carcinoma. This nanosystem is constructed by using perfluorooctyl bromide (PFOB) core as the oxygen carrier, functionalized with an oxygen sensitive probe (Ir(III) complex) and subsequently enclosed with an ultrathin-walled silica shell. Due to the silica shell, this nanosystem can store oxygen for longer than 7 days. The oxygen in the O-2-PIr@Si@PDA nanosystem can be released quickly with the temperature-responsive rupture of the silicon shell under near-infrared (NIR) irradiation. The oxygen storage and release can be self-monitored using the Ir(III) complex with its luminescence effect. As expected, this multifunctional nanosystem in combination with NIR irradiation not only inhibits tumor growth by alleviating hypoxia, but also enhances the effect of oxygen-sensitized radiotherapy against nasopharyngeal carcinoma. Taken together, this study offers a novel strategy for designing long-term oxygen storing nanosystem to relieve tumor hypoxia, thus improving the precise cancer therapeutic efficacy.
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