Self-production of oxygen system CaO2 /MnO2 @PDA-MB for the photodynamic therapy research and switch-control tumor cell imaging.

Self-production of oxygen system CaO2 /MnO2 @PDA-MB for the photodynamic therapy research and switch-control tumor cell imaging.
J Biomed Mater Res B Appl Biomater. 2018 Jan 18;:
Authors: Ji C, Lu Z, Xu Y, Shen B, Yu S, Shi D
Abstract
Photodynamic therapy (PDT) holds promise in biochemical study and tumor treatment. A novel multifunctional nanosystem CaO2 /MnO2 @polydopamine (PDA)-methylene blue (MB) nanosheet (CMP-MB) was designed. CaO2 nanoparticles were encapsulated by MnO2 nanosheet, and then PDA was coated on the surface of CaO2 /MnO2 nanosheets, which could adsorb photosensitizer MB through hydrophobic interaction or π-π stacking. In this nanosystem, CaO2 /MnO2 had the ability of self-production of oxygen, which solved the problem of tumor hypoxia largely. Moreover, it is worth mentioning that the fluorescence of MB was suppressed by MnO2 , while its emission was triggered in the simulated tumor microenvironment. Therefore, CMP-MB nanosheet could be used to switch-control cell imaging potentially. 3-(4,5-dimethyl-thiazol-2-yl)-2,5-diphenyltetrazolium bromide testing and Live/Dead assay confirmed CMP-MB nanosheet had fewer side effects without illumination while it destroyed Hela cell with the illumination of light. Vitro cell experiment demonstrated CMP-MB nanosheet could achieve tumor microenvironment responsive imaging and inhibit tumor cell growth under illumination effectively. Therefore, the system has great potential fo...

Source: Biomed Res - January 18, 2018 Category: Research Authors: Ji C, Lu Z, Xu Y, Shen B, Yu S, Shi D Tags: J Biomed Mater Res B Appl Biomater Source Type: research