期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 22, 页码 12261-12269出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03067
关键词
scintillating nanoparticles; mesoporous; photodynamic therapy; FRET; X-ray; deep-seated tumor
资金
- National Basic Research Program of China (program 973) [2012CB932500]
- National Science Foundation of China [81201193, 81473171]
Photodynamic therapy (PDT) for deep-seated tumor is largely impeded by the limited penetration depth of excitation light in tissue. X-ray is considered as an ideal energy source to activate photosensitizers (PSs) located deep within the body with the assistance of scintillating nanoparticles (ScNPs). However, the efficacy under this concept is not satisfying due to the low scintillating luminescence and weak energy transfer from ScNPs to PSs. Here, mesoporous LaF3:Tb ScNPs were successfully synthesized by a facile hydrothermal process to act as PS carriers and X-ray energy transducers, owing to their good ionizing radiation stopping power and high luminescence efficiency. The formation mechanism of porous structure was elucidated in detail with classical crystallization theory. After a systematic investigation, LaF3:Tb ScNPs with optimized Scintillating luminescence were obtained for loading Rose Bengal (RB) to establish an efficient FRET system, owing to their excellent Spectral match. The FRET efficiency between SeNPs and RB was calculated to be as high as 85%. Under irradiation, enhanced O-1(2) generation induced by LaF3:Tb-RB nanocomposites via FRET process was detected. This LaF3:Tb-RB FRET system shows great potential to be applied in X-ray stimulated PDT for deep-seated tumors in the future.
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