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Open AccessArticle

A H2O2-Responsive Boron Dipyrromethene-Based Photosensitizer for Imaging-Guided Photodynamic Therapy

State Key Laboratory of Photocatalysis on Energy and Environment & National & Local Joint Biomedical Engineering Research Center on Photodynamic Technologies, College of Chemistry, Fuzhou University, Fuzhou 350108, China
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Author to whom correspondence should be addressed.
These two authors contributed equally to this work.
Academic Editors: M. Graça P. M. S. Neves, M. Amparo F. Faustino and Nuno M. M. Moura
Molecules 2019, 24(1), 32; https://doi.org/10.3390/molecules24010032
Received: 26 November 2018 / Revised: 18 December 2018 / Accepted: 18 December 2018 / Published: 21 December 2018
In this study, we demonstrate a novel H2O2 activatable photosensitizer (compound 7) which contains a diiodo distyryl boron dipyrromethene (BODIPY) core and an arylboronate group that quenches the excited state of the BODIPY dye by photoinduced electron transfer (PET). The BODIPY-based photosensitizer is highly soluble and remains nonaggregated in dimethyl sulfoxide (DMSO) as shown by the intense and sharp Q-band absorption (707 nm). As expected, compound 7 exhibits negligible fluorescence emission and singlet oxygen generation efficiency. However, upon interaction with H2O2, both the fluorescence emission and singlet oxygen production of the photosensitizer can be restored in phosphate buffered saline (PBS) solution and PBS buffer solution containing 20% DMSO as a result of the cleavage of the arylboronate group. Due to the higher concentration of H2O2 in cancer cells, compound 7 even with low concentration is particularly sensitive to human cervical carcinoma (HeLa) cells (IC50 = 0.95 μM) but hardly damage human embryonic lung fibroblast (HELF) cells. The results above suggest that this novel BODIPY derivative is a promising candidate for fluorescence imaging-guided photodynamic cancer therapy. View Full-Text
Keywords: photodynamic therapy; activatable photosensitizers; H2O2-responsive; photoinduced electron transfer (PET) photodynamic therapy; activatable photosensitizers; H2O2-responsive; photoinduced electron transfer (PET)
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MDPI and ACS Style

Wang, Z.-W.; Su, D.; Li, X.-Q.; Cao, J.-J.; Yang, D.-C.; Liu, J.-Y. A H2O2-Responsive Boron Dipyrromethene-Based Photosensitizer for Imaging-Guided Photodynamic Therapy. Molecules 2019, 24, 32.

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