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      1. Author :
        Li, Shi-Ying; Cheng, Hong; Xie, Bo-Ru; Qiu, Wen-Xiu; Song, Li-Lin; Zhuo, Ren-Xi; Zhang, Xian-Zheng
      2. Title :
      3. Type :
        Journal Article
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      11. Keywords :
        Theranostic; Ratiometric imaging; Apoptosis imaging; FRET; Photodynamic therapy; IVIS; IVIS FLI in vivo
      12. Abstract :
        Feedback imaging-guided precise photodynamic therapy (PDT) can facilitate the development of personalized medicine. In this work, a Förster resonance energy transfer (FRET) based theranostic probe was fabricated for simultaneous tumor targeting PDT and ratiometric imaging of the therapeutic effect. The theranostic probe (designated as P-PpIX) was comprised of a targeting moiety, a caspase-3 responsive linker, a FRET fluorophore pair and a photosensitizer. It was found that P-PpIX exhibited low intrinsic background fluorescence due to the high FRET quenching efficiency. The Arg-Gly-Asp (RGD) targeting moiety allowed P-PpIX to selectively accumulate in αvβ3 integrin overexpressed tumor cells. Upon photo irradiation, the PDT effect of P-PpIX could induce cell death with apoptosis related mechanism, and the activated caspase-3 would subsequently cleave the Asp-Glu-Val-Asp (DEVD) peptide sequence to terminate the intramolecular FRET process. The activated caspase-3 expression and the real time therapeutic efficacy could be precisely assessed in situ by the fluorescence intensity ratio of the released 5(6)-carboxylfluorescein (FAM, reporter fluorescence) and protoporphyrin IX (PpIX, internal reference fluorescence). This novel ratiometric theranostic probe could provide the real-time feedback for precise PDT.
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      14. Call Number :
        PKI @ user @ 12157
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