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- W3018133722 abstract "Tumor hypoxia severely impedes the therapeutic efficacy of type II photodynamic therapy (PDT) depending on singlet oxygen (1O2) generation. To combat hypoxic tumors, herein, a new approach is devised to boost superoxide radical (O2•−) photogeneration for type I PDT. Heavy atoms are introduced onto aza-BODIPY molecules (iodine substituted butoxy-aza-BODIPY, IBAB) to promote their intersystem-crossing (ISC) ability. Meanwhile, methoxy-poly(ethylene glycol)-b-poly(2-(diisopropylamino) ethyl methacrylate) (mPEG-PPDA) with enhanced electron-donating efficiency is employed as a coating matrix to encapsulate IBAB, thereby obtaining amphiphilic aza-BODIPY nanoplatforms (PPIAB NPs). Under irradiation, triplet-state IBAB in PPIAB NPs is efficiently generated from singlet state favored by the elevated ISC ability. The electron-rich environment provided by mPEG-PPDA can donate triplet-state IBAB with one electron to form charge-separated-state IBAB, which in turn transfers electron to O2 for O2•− production. Significantly, owing to recyclable O2 generated by disproportionation or Harber–Weiss/Fenton reaction, prominent O2•− is generated by PPIAB NPs even in a severe hypoxic environment (2% O2), enabling superior therapeutic efficacy (96.2% tumor-inhibition rate) over NPs not following this strategy. Thus, the proof-of-concept design of ISC-enhanced and electron-rich polymer encapsulating PPIAB NPs illuminates the path to preparing O2•− photogenerator for hypoxic cancer treatment." @default.
- W3018133722 created "2020-05-01" @default.
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- W3018133722 date "2020-04-19" @default.
- W3018133722 modified "2023-10-15" @default.
- W3018133722 title "Boosting O<sub>2</sub><sup>•−</sup>Photogeneration via Promoting Intersystem‐Crossing and Electron‐Donating Efficiency of Aza‐BODIPY‐Based Nanoplatforms for Hypoxic‐Tumor Photodynamic Therapy" @default.
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- W3018133722 doi "https://doi.org/10.1002/smtd.202000013" @default.
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