Biomimetic Hybrid Nanozymes with Self-Supplied H+ and Accelerated O2 Generation for Enhanced Starvation
and Photodynamic Therapy against Hypoxic Tumors
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Nanozymes
as artificial enzymes that mimicked natural enzyme-like
activities have received great attention in cancer diagnosis and therapy.
Biomimetic nanozymes require more consideration regarding complicated
tumor microenvironments to mimic biological enzymes, thus achieving
superior nanozyme activity in vivo. Here we report a biomimetic hybrid
nanozyme (named rMGB) which integrates natural enzyme glucose oxidase
(GOx) with nanozyme manganese dioxide (MnO2) by mutual
promotion for maximizing the enzymatic activity of MnO2 and GOx. Under hypoxia environment, we observed that MnO2 could react with endogenous H2O2 to produce
O2 for enhancing the catalytic efficiency of GOx for starvation
therapy. Meanwhile, we confirmed that glucose oxidation generated
gluconic acid and further improved the catalytic efficiency of MnO2 subsequently. The biochemical reaction cycle, consisting
of MnO2, O2, GOx, and H+, was triggered
by the tumor microenvironment and accelerated each other so as to
achieve self-supplied H+ and accelerate O2 generation,
enhancing the starvation therapy, alleviating tumor hypoxia and accelerating
the reactive oxygen species generation in photodynamic therapy. This
biomimetic hybrid nanozyme would further facilitate the development
of biological nanozymes for cancer treatment.
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Yang, Xue; Yang, Ying; Gao, Fang; Wei, Jia-Jia; Qian, Cheng-Gen; Sun, Min-Jie (2019). Biomimetic Hybrid Nanozymes with Self-Supplied H+ and Accelerated O2 Generation for Enhanced Starvation
and Photodynamic Therapy against Hypoxic Tumors. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.9b00934