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Photoswitchable Micelles for the Control of Singlet-Oxygen Generation in Photodynamic Therapies

Zhai, Y., Busscher, H. J., Liu, Y., Zhang, Z., van Kooten, T. G., Su, L., Zhang, Y., Liu, J., Liu, J., An, Y. & Shi, L., 11-Jun-2018, In : Biomacromolecules. 19, 6, p. 2023-2033 11 p.

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  • Photoswitchable Micelles for the Control of Singlet-Oxygen Generation in Photodynamic Therapies

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DOI

Inadvertent photosensitizer-activation and singlet-oxygen generation hampers clinical application of photodynamic therapies of superficial tumors or subcutaneous infections. Therefore, a reversible photoswitchable system was designed in micellar nanocarriers using ZnTPP as a photosensitizer and BDTE as a photoswitch. Singlet-oxygen generation upon irradiation didnot occur in closed-switch micelles with ZnTPP/BDTE feeding ratios >1:10. Deliberate switch closure/opening within 65-80 min was possible through thin layers of porcine tissue in vitro, increasing for thicker layers. Inadvertent opening of the switch by simulated daylight, took several tens of hours. Creating deliberate cell damage and prevention of inadvertent damage in vitro and in mice could be done at lower ZnTPP/BDTE feeding ratios (1:5) in open-switch micelles and at higher irradiation intensities than inferred from chemical clues to generate singlet-oxygen. The reduction of inadvertent photosensitizer activation in micellar nanocarriers, while maintaining the ability to kill tumor cells and infectious bacteria established here, brings photo dynamic therapies closer to clinical application.

Original languageEnglish
Pages (from-to)2023-2033
Number of pages11
JournalBiomacromolecules
Volume19
Issue number6
Publication statusPublished - 11-Jun-2018

    Keywords

  • METAL-ORGANIC FRAMEWORKS, BLOCK-COPOLYMER MICELLES, PHOTOCHROMIC SWITCHES, DRUG-DELIVERY, PORPHYRIN, SURFACE, CELLS, PHOTOSENSITIZERS, PHOTOCHEMISTRY, NANOPARTICLES

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