Biocompatible Ruthenium Single-Atom Catalyst for Cascade Enzyme-Mimicking Therapy.
Wenyu WangYang ZhuXiaorong ZhuYafei ZhaoZhenggang XueCan XiongZhiyuan WangYunteng QuJunjie ChengMin ChenManman LiuFangyao ZhouHaoran ZhangZheng JiangYidong HuHuang ZhouHuijuan WangYa-Fei LiYang-Zhong LiuYuen WuPublished in: ACS applied materials & interfaces (2021)
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.