Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 599, Issue -, Pages 543-555Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.03.173
Keywords
Photodynamic therapy; Chemodynamic therapy; Glutathione-depleting; Magnetic resonance imaging; Starvation therapy
Categories
Funding
- Research Grants Council of Hong Kong SAR [CityU 11305920, 11207117, T42103/16N]
- City University of Hong Kong [7005096, 7005257, 9678122]
- National Natural Science Foundation of China [81874084]
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The study presents an intelligent ROS nanogenerator CGZPM with O-2-generating and GSH-/glucose-depleting abilities, which can achieve multifunctionality by providing O-2 and depleting GSH/glucose, resulting in enhanced PDT and CDT efficacy.
The combination of photodynamic therapy (PDT) and chemodynamic therapy (CDT) have attracted a great deal of interest, but tumor hypoxia and glutathione (GSH) overproduction still limit their further applications. Herein, an intelligent reactive oxygen species (ROS) nanogenerator Ce6/GOx@ZIF-8/PDA@MnO2 (denoted as CGZPM; Ce6, GOx, ZIF-8, PDA, MnO2 are chlorin e6, glucose oxidase, zeolitic imidazolate framework-8, polydopamine and manganese dioxide respectively) with O-2-generating and GSH-/glucose-depleting abilities was constructed by a facile and green one-pot method. After intake by tumor cells, the outer MnO2 was rapidly degraded by the acidic pH, and the overexpression of hydrogen peroxide (H2O2) and GSH with abundant Mn2+ and O-2 produced would eventually achieve multifunctionality. The Mn2+ acted as an ideal Fenton-like agent and magnetic resonance (MR) imaging contrast agent, while the O-2 promoted the PDT via hypoxia relief and facilitated the intratumoral glucose oxidation by GOx for starvation therapy (ST). Benefiting from the GOx-based glycolysis process, sufficient H2O2 was generated to improve the CDT efficacy through Mn2+-mediated Fenton-like reaction. Notably, MnO2 and PDA could decrease the tumor antioxidant activity by consuming GSH, resulting in remarkably enhanced PDT/CDT. Such a novel cascade bioreactor with tumor microenvironment (TME)-modulating capability opens new opportunities for ROS-based and combinational treatment paradigms. (C) 2021 Elsevier Inc. All rights reserved.
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