Biocompatible Ruthenium Single-Atom Catalyst for Cascade Enzyme-Mimicking Therapy
Wenyu Wang, Yang Zhu, Xiaorong Zhu, Yafei Zhao, Zhenggang Xue, Can Xiong, Zhiyuan Wang, Yunteng Qu, Junjie Cheng, Min Chen, Manman Liu, Fangyao Zhou, Haoran Zhang, Zheng Jiang, Yidong Hu, Huang Zhou, Huijuan Wang, Yafei Li, Yangzhong Liu, Yuen Wu
Abstract
Rationally constructing single-atom enzymes (SAEs) with superior activity, robust stability, and good biocompatibility is crucial for tumor therapy but still remains a substantial challenge. In this work, we adopt biocompatible carbon dots as the carrier material to load Ru single atoms, achieving Ru SAEs with superior multiple enzyme-like activity and stability. Ru SAEs behave as oxidase, peroxidase, and glutathione oxidase mimics to synchronously catalyze the generation of reactive oxygen species (ROS) and the depletion of glutathione, thus amplifying the ROS damage and finally causing the death of cancer cells. Notably, Ru SAEs exhibit excellent peroxidase-like activity with a specific activity of 7.5 U/mg, which surpasses most of the reported SAEs and is 20 times higher than that of Ru/C. Theoretical results reveal that the electrons of the Ru 4d orbital in Ru SAEs are transferred to O atoms in H2O2 and then efficiently activate H2O2 to produce •OH. Our work may provide some inspiration for the design of SAEs for cancer therapy.