Sub‐Nanosheet Induced Inverse Growth of Negative Valency Au Clusters for Tumor Treatment by Enhanced Oxidative Stress

Author:

Wang Dong1,Yuan Feng1,Deng Xuliang2,Liu Qingda1,Shi Wenxiong3,Wang Xun1ORCID

Affiliation:

1. Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry Tsinghua University Beijing 100084 China

2. Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry Peking University School and Hospital of Stomatology Beijing 100081 China

3. Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science and Engineering Tianjin University of Technology Tianjin 300387 China

Abstract

AbstractCluster aggregation states are thermodynamically favored at the subnanoscale, for which an inverse growth from nanoparticles to clusters may be realized on subnanometer supports. Herein, we develop Au‐polyoxometalate‐layered double hydroxide (Au‐POM‐LDH) sub‐1 nm nanosheets (Sub‐APL) based on the above strategy, where sub‐1 nm Au clusters with negative valence are generated by the in situ disintegration of Au nanoparticles on POM‐LDH supports. Sub‐1 nm Au clusters with ultrahigh surface atom ratios exhibit remarkable efficiency for glutathione (GSH) depletion. The closely connected sub‐1 nm Au with negative valence and POM hetero‐units can promote the separation of hole‐electrons, resulting in the enhanced reactive oxygen species (ROS) generation under ultrasound (US). Besides, the reversible redox of Mo in POM is able to deplete GSH and trigger chemodynamic therapy (CDT) simultaneously, further enhancing the oxidative stress. Consequently, the Sub‐APL present 2‐fold ROS generation under US and 7‐fold GSH depletion compared to the discrete Au and POM‐LDH mixture. Therefore, the serious imbalance of redox in the TME caused by the sharp increase of ROS and rapid decrease of GSH leads to death of tumor ultimately.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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