4 research outputs found
Highly Efficient FRET System Capable of Deep Photodynamic Therapy Established on X‑ray Excited Mesoporous LaF<sub>3</sub>:Tb Scintillating Nanoparticles
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
LaF<sub>3</sub>: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, LaF<sub>3</sub>: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 ScNPs and RB was calculated to be as high
as 85%. Under irradiation, enhanced <sup>1</sup>O<sub>2</sub> generation
induced by LaF<sub>3</sub>:Tb-RB nanocomposites via FRET process was
detected. This LaF<sub>3</sub>:Tb-RB FRET system shows great potential
to be applied in X-ray stimulated PDT for deep-seated tumors in the
future
Enhancing the activity of platinum-based drugs by improved inhibitors of ERCC1–XPF-mediated DNA repair
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