4.6 Article

Encapsulation of Enzymes in Metal-Phenolic Network Capsules for the Trigger of Intracellular Cascade Reactions

Journal

LANGMUIR
Volume 37, Issue 38, Pages 11292-11300

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.1c01821

Keywords

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Funding

  1. National Natural Science Foundation of China [21872085, 21802088]
  2. Project for Scientific Research Innovation Team of Young Scholars in Colleges and Universities of Shandong Province [2020KJC001]
  3. Innovation Project of Jinan Science and Technology Bureau [2020GXRC022]
  4. Translational Medicine Core Facility of Advanced Medical Research Institute at the Shandong University

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This study presents a strategy for fabricating enzyme-encapsulated metal-phenolic network capsules using enzyme-loaded zeolitic imidazolate framework nanoparticles as templates. The controlled capsule size and thickness can be achieved by varying template size and coating time, and the encapsulated enzymes are effective in inhibiting cancer cell viability.
Nanoengineered capsules encapsulated with functional cargos (e.g., enzymes) are of interest for various applications including catalysis, bioreactions, sensing, and drug delivery. Herein, we report a facile strategy to engineer enzyme-encapsulated metal-phenolic network (MPN) capsules using enzyme-loaded zeolitic imidazolate framework nanoparticles (ZIF-8 NPs) as templates, which can be removed in a mild condition (e.g., ethyl-enediaminetetraacetic acid (EDTA) solution). The capsule size (from 250 nm to 1 mu m) and thickness (from 9.8 to 33.7 nm) are well controlled via varying the template size and coating time, respectively. Importantly, MPN capsules encapsulated with enzymes (i.e., glucose oxidase) can trigger the intracellular cascade reaction via the exhaustion of glucose to produce H2O2 and subsequently generate toxic hydroxyl radicals ((OH)-O-center dot) based on the Fenton reaction via the reaction between H2O2 and iron ions in MPN coatings. The intracellular cascade reaction for the generation of (OH)-O-center dot is efficient to inhibit cancer cell viability, which is promising for the application in chemodynamic therapy.

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