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H2O2-responsive biodegradable nanomedicine for cancer-selective dual-modal imaging guided precise photodynamic therapy

Zeng, Qin, Zhang, Ruijing, Zhang, Tao, Xing, Da
Biomaterials 2019 v.207 pp. 39-48
adjuvants, adverse effects, biodegradability, bovine serum albumin, cytotoxicity, encapsulation, fluorescence, hydrogen peroxide, image analysis, methylene blue, nanomedicine, photochemotherapy, photosensitizing agents, precision medicine, quinones, singlet oxygen
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 H2O2-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 H2O2 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 (1O2) generation, but also to simultaneously produce a GSH-depleting adjuvant quinone methide to boost the 1O2 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.