Zeolitic imidazolate metal organic framework-8 as an efficient pH-controlled delivery vehicle for zinc phthalocyanine in photodynamic therapy

Zeolitic imidazolate metal organic framework-8 as an efficient pH-controlled delivery vehicle for... To improve the aqueous solubility and cancer targeting of the photosensitizers in photodynamic therapy (PDT), we encapsulated the photosensitizer in a biocompatibility and pH-sensitive drug delivery system, zeolitic imidazolate frameworks-8 (ZIF-8) nanospheres. Powder X-ray diffraction and electron microscopy show that our nanospheres are uniform and single-crystalline particles. Owing to the cleavage of zinc–ligand coordination bonds, more ZnPc–COOH were released much faster in the mild acidic conditions (pH 5.0 and 6.0) in comparison with physiological environment (pH 7.4). By incorporating ZnPc–COOH in ZIF-8, our nanospheres exhibited high singlet oxygen quantum yield and intracellular ROS generation. Cell viability experiments toward HepG2 cells demonstrated the low toxicity of ZIF-8 and the good anticancer efficacy of the nanospheres with low IC50 values (4.2–4.9 μg/mL) under light illumination (670 nm, 1.5 J/cm2). Collectively, these results suggested that our nanospheres are the promising pH-responsive drug delivery systems for PDT. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Zeolitic imidazolate metal organic framework-8 as an efficient pH-controlled delivery vehicle for zinc phthalocyanine in photodynamic therapy

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-017-1716-z
Publisher site
See Article on Publisher Site

Abstract

To improve the aqueous solubility and cancer targeting of the photosensitizers in photodynamic therapy (PDT), we encapsulated the photosensitizer in a biocompatibility and pH-sensitive drug delivery system, zeolitic imidazolate frameworks-8 (ZIF-8) nanospheres. Powder X-ray diffraction and electron microscopy show that our nanospheres are uniform and single-crystalline particles. Owing to the cleavage of zinc–ligand coordination bonds, more ZnPc–COOH were released much faster in the mild acidic conditions (pH 5.0 and 6.0) in comparison with physiological environment (pH 7.4). By incorporating ZnPc–COOH in ZIF-8, our nanospheres exhibited high singlet oxygen quantum yield and intracellular ROS generation. Cell viability experiments toward HepG2 cells demonstrated the low toxicity of ZIF-8 and the good anticancer efficacy of the nanospheres with low IC50 values (4.2–4.9 μg/mL) under light illumination (670 nm, 1.5 J/cm2). Collectively, these results suggested that our nanospheres are the promising pH-responsive drug delivery systems for PDT.

Journal

Journal of Materials ScienceSpringer Journals

Published: Oct 16, 2017

References

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