J. Mater. Sci. Technol. ›› 2023, Vol. 155: 227-237.DOI: 10.1016/j.jmst.2023.01.033

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Defect engineering endows NiTi stents with photothermal-enhanced catalytic activity for high-efficiency tumor therapy

Haifeng Zhanga,b, Min Xingc, Wenhao Qianc, Shun Xingb,d, Jiajun Qiub,*, Xuanyong Liua,b,d,*   

  1. aSchool of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou 310024, China;
    bState Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    cShanghai Xuhui District Dental Center, Shanghai 200032, China;
    dCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-11-09 Revised:2023-01-20 Accepted:2023-01-21 Published:2023-08-20 Online:2023-03-18
  • Contact: *E-mail addresses: qiujiajun@mail.sic.ac.cn (J. Qiu), xyliu@mail.sic.ac.cn (X. Liu).

Abstract: NiTi stents are widely used in clinic for palliative care to relieve obstruction caused by Gastrointestinal (GI) cancers, which have high morbidity and mortality rates. However, tumor invasion and tumor overgrowth around the stent after surgery may lead to re-obstruction of the lumen. Thus, it is urgent to endow NiTi stents with excellent tumor suppressive ability and good biocompatibility. In this study, Ce-BTC was firstly prepared on the surface of NiTi pretreated by alkaline heat, followed by pyrolysis in Ar atmosphere at 450 °C. Then, a composite coating consisting of defective cerium oxide and black Ni-Ti hydroxide/oxide was constructed on NiTi surface, which exhibited tumor microenvironment-response and hyperthermia-enhanced catalytic ability. Under near-infrared light irradiation, the photothermal performance of black Ni-Ti hydroxide/oxide and hyperthermia-enhanced catalytic activity of defective cerium oxide can achieve a synergistic effect of photothermal therapy and tumor catalytic therapy. Thereafter, defective cerium oxide can sustainably inhibit the proliferation of residual tumor cells by the generation of reactive oxygen species. Moreover, the composite coating has no obvious cytotoxicity to normal cells. This work provides a new insight for the preparation of stimulus-responsive antitumor stents for palliative treatment of gastrointestinal cancer.

Key words: Defect engineering, NiTi, Photothermal, Nanozyme, Tumor therapy