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H 2 O 2 -responsive biodegradable nanomedicine for cancer-selective dual-modal imaging guided precise photodynamic therapy.
Biomaterials 2019 July
A tumor-related stimuli-activatable and biodegradable nanoplatform for tumor-selective imaging and effective photodynamic therapy (PDT) towards precision medicine is highly desirable but still greatly challenging. Here, we developed a novel H2 O2 -activatable and biodegradable nanomedicine (BSA-MBPB) by encapsulation of a single newly synthesized pro-photosensitizer (MBPB) with its photoactivity completely annihilated within bovine serum albumin (BSA) to achieve imaging-guided tumor-targeted effective PDT. BSA-MBPB can be decomposed and activated by H2 O2 to not only produce the clinical photosensitizer methylene blue to recover its fluorescent, photoacoustic and photosensitizing properties for dual-modal imaging and cytotoxic singlet oxygen (1 O2 ) generation, but also to simultaneously produce a GSH-depleting adjuvant quinone methide to boost the 1 O2 yield, thus strengthening the efficacy of PDT. BSA-MBPB allows for highly efficient and accurate PDT without major side effects, offering potential as the next-generation nanomedicine towards clinical practice of precise PDT.
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