The development of near-infrared (NIR) dyes with desirable photophysical characteristics for tumor therapy is highly expected at present. In this report, IR-780 iodide was loaded by the mercaptopropionic acid grafted poly(ethylene glycol)-block-poly(epsilon-caprolactone)-block-poly(allyl glycidyl ether) [mPEG(SK)-PCL10K-PAGE(6) (MPA)] copolymer to form nanomicelles (IR-780@TBMPA) in aqueous solution. On account of the hydrophobic and electrostatic interaction between mPEG(5K)-PCL10K-PAGE(6) (MPA) and IR-780, the IR-780@TBMPA micelle was structurally stable with improved solubility, light stability and biocompatibility. The encapsulation of IR-780 indicated no influence on its original physicochemical property, showing good optical and thermal characteristics. The drug-loaded micelles had appropriate micro- scopic size for endocytosis, displaying significant cytotoxicity to HeLa cells under NIR laser irradiation. In addition, the phototoxicity generated by photothermal and photodynamic effect of IR-780@TBMPA under 808 nm laser irradiation was also investigated by reactive oxygen species (ROS) detection and flow cytometry. Furthermore, the superior accumulation of IR-780@TBMPA in tumor tissues provided sufficient hyperthermia to kill tumor cells, indicating its potential in cancer clinical therapy.
[1]Chinese Acad Sci, State Key Lab Polymer Phys & Chem, Changchun Inst Appl Chem, Changchun 130022, Jilin, Peoples R China.
[2]Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China.
[3]Jilin Univ, Dept Obstet & Gynaecol, China Japan Union Hosp, Changchun 130022, Jilin, Peoples R China.
[4]Univ Southern Calif, Dept Chem, Los Angeles, CA 90089 USA.
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