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• W2552930736 abstract "Mitochondria in cancer cells maintain a more negative membrane potential than normal cells. Mitochondria are the primary source of cellular reactive oxygen species (ROS), which are necessary for photodynamic therapy. Thus, the strategy of targeting mitochondria can maximize the photodynamic therapeutic efficiency for cancer. Here we report, for the first time, synthesis of a new mitochondria-targeting drug delivery system, ZnPc/CPT-TPPNPs. To synthesize this novel compound, polyethylene glycol was functionalized with thioketal linker-modified camptothecin (TL-CPT) and triphenylphosphonium to form the block copolymer, TL-CPT-PEG1K-TPP. The ZnPc/CPT-TPPNPs was constructed for delivery of the photosensitizer Zinc phthalocyanine (ZnPc) by blending the block copolymer TL-CPT-PEG1K-TPP with 1, 2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy (polyethylene glycol)] (DSPE-PEG).Triphenylphosphine can accumulate selectively several hundred-fold within mitochondria. The thioketal linker is ROS-responsive and CPT can be released upon ROS cleavage. We also show that the ZnPc loaded in ZnPc/CPT-TPPNPs absorbed the 633 nm laser to produce ROS, which could be utilized both in photodynamic therapy and to cleave the thioketal linker thereby releasing camptothecin for chemotherapy. Thus, the mitochondria-targeting nanoparticles could elevate photodynamic therapeutic efficacy. Our results showed that surface modification of the nanoparticles with triphenylphosphine cations facilitated efficient subcellular delivery of the photosensitizer to mitochondria. The nanoparticles had a good ROS-responsive effect to release CPT, which could transfer to the nucleus and interfere with DNA replication as a topoisomeraseⅠinhibitor. Thus, the blended nanoparticles provide a new promising approach as a mitochondria-targeting ROS-activated chemo- and photodynamic therapy with a single light source for lung cancer." @default.
• W2552930736 created "2016-11-30" @default.
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• W2552930736 date "2016-01-01" @default.
• W2552930736 modified "2023-10-16" @default.
• W2552930736 title "ROS-Responsive Mitochondria-Targeting Blended Nanoparticles: Chemo- and Photodynamic Synergistic Therapy for Lung Cancer with On-Demand Drug Release upon Irradiation with a Single Light Source." @default.
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• W2552930736 doi "https://doi.org/10.7150/thno.15433" @default.
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