Theranostics 2021; 11(6):2806-2821. doi:10.7150/thno.51912

Research Paper

Catalytic patch with redox Cr/CeO2 nanozyme of noninvasive intervention for brain trauma

Shaofang Zhang1*, Ying Liu1*, Si Sun1*, Junying Wang1, Qifeng Li4, Ruijuan Yan1, Yalong Gao4, Haile Liu1, Shuangjie Liu2, Wenting Hao2, Haitao Dai1, Changlong Liu1, Yuanming Sun3, Wei Long3✉, Xiaoyu Mu2✉, Xiao-Dong Zhang1,2✉

1. Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology, Institute of Advanced Materials Physics, School of Sciences, Tianjin University, Tianjin, 300350, China.
2. Academy of Medical Engineering and Translational Medicine, Medical College, Tianjin University, Tianjin, 300072, China.
3. Tianjin Key Laboratory of Molecular Nuclear Medicine, Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin, 300192, China.
4. Department of Neurosurgery and Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Tianjin Medical University General Hospital, Tianjin 300052, China.
* These authors have contributed equally.

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Citation:
Zhang S, Liu Y, Sun S, Wang J, Li Q, Yan R, Gao Y, Liu H, Liu S, Hao W, Dai H, Liu C, Sun Y, Long W, Mu X, Zhang XD. Catalytic patch with redox Cr/CeO2 nanozyme of noninvasive intervention for brain trauma. Theranostics 2021; 11(6):2806-2821. doi:10.7150/thno.51912. Available from https://www.thno.org/v11p2806.htm

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Abstract

Traumatic brain injury (TBI) is a sudden injury to the brain, accompanied by the production of large amounts of reactive oxygen and nitrogen species (RONS) and acute neuroinflammation responses. Although traditional pharmacotherapy can effectively decrease the immune response of neuron cells via scavenging free radicals, it always involves in short reaction time as well as rigorous clinical trial. Therefore, a noninvasive topical treatment method that effectively eliminates free radicals still needs further investigation.

Methods: In this study, a type of catalytic patch based on nanozymes with the excellent multienzyme-like activity is designed for noninvasive treatment of TBI. The enzyme-like activity, free radical scavenging ability and therapeutic efficacy of the designed catalytic patch were assessed in vitro and in vivo. The structural composition was characterized by the X-ray diffraction, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy technology.

Results: Herein, the prepared Cr-doped CeO2 (Cr/CeO2) nanozyme increases the reduced Ce3+ states, resulting in its enzyme-like activity 3-5 times higher than undoped CeO2. Furthermore, Cr/CeO2 nanozyme can improve the survival rate of LPS induced neuron cells via decreasing excessive RONS. The in vivo experiments show the Cr/CeO2 nanozyme can promote wound healing and reduce neuroinflammation of mice following brain trauma. The catalytic patch based on nanozyme provides a noninvasive topical treatment route for TBI as well as other traumas diseases.

Conclusions: The catalytic patch based on nanozyme provides a noninvasive topical treatment route for TBI as well as other traumas diseases.

Keywords: nanozyme, multienzyme-like activity, RONS-scavenging, traumatic brain injury, noninvasive treatment