Abstract
X-ray nanoscintillator-based photoresponsive therapy is emerging as a promising strategy to treat in vivo tumors, necessitating the development of nanoscintillators with X-ray-excited luminescence in the ultraviolet region (UV-XEL) for the photoactivation of therapeutic precursors. However, it remains a challenge to achieve high-efficiency X-ray-activated tumor therapy due to the limited UV-XEL efficacy. Herein, we developed novel Gd3+/Ce3+-codoped LiLuF4 nanoscintillators with strong UV-XEL for in vivo tumor therapy. Significantly, through optimization of host materials, dopants, and energy transfer process, the developed nanoscintillators enabled effective enhancement of UV-XEL (up to 18-fold) as compared with the traditional Ce3+-doped counterparts. As a proof-of-concept study to evaluate the in vivo therapeutic applications of the nanoscintillators, we integrated them with nitric oxide (NO) precursors for controllably generating NO upon the X-ray exposure, achieving superior in vivo antitumor effect upon X-ray-induced synergetic NO therapy and radiotherapy. Moreover, X-ray-activated NO therapy can inhibit tumor metastasis into liver to suppress tumor regrowth and prolong mice survival. This work might motivate future development of X-ray nanoscintillators for treating diseases in deep tissue.
摘要
基于X射线纳米闪烁体的光响应疗法是一种新兴的有良好应用前景的活体肿瘤治疗策略, 迫切需要开发具有高效X射线激发紫外发光性能的纳米闪烁体. 然而, 由于当前纳米闪烁体的X射线紫外发光性能仍较弱, 实现高效的X射线激活肿瘤治疗仍然是一个巨大的挑战. 为此, 我们发展了一种新型的具有良好X射线紫外发光性能的Gd3+/Ce3+共掺杂的LiLuF 4 纳米闪烁体, 并将其应用于活体肿瘤治疗. 通过优化基质材料、 掺杂剂和能量传递设计合成的纳米闪烁体, 其X射线紫外发光强度比传统的Ce3+单掺杂材料增强了约18倍. 我们进一步将纳米闪烁体与一氧化氮(NO)前体结合以概念验证研究纳米闪烁体的应用. 在X射线照射下, 该纳米复合物能够可控地产生NO, 并在X射线诱导的NO和放射治疗协同作用下实现了优异的抗肿瘤效果. 此外, X射线激活的NO治疗可以抑制肿瘤向肝脏转移, 抑制肿瘤再生, 延长小鼠存活率. 这项工作有望推动纳米闪烁体的发展及其在活体深层组织疾病治疗中的应用.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (22027805 and 22274024), the Major Project of Science and Technology of Fujian Province (2020HZ06006), the Young Elite Scientist Sponsorship Program by CAST (YESS20200110), and China Postdoctoral Science Foundation (2022M720737 and 2021T140117)
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Author contributions Song X conceived the idea and supervised this work. Yang K, Yang Y, and Sun D conducted the experiments, analyzed the data, and prepared the manuscript. Li S, Song X, and Yang H revised the manuscript. All authors contributed to the general discussion.
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Kaidong Yang is a Master candidate at Fuzhou University. His current research focuses on the lanthanide-doped nanoscintillators.
Xiaorong Song is an associate professor at the college of chemistry, Fuzhou University. He received his PhD degree in 2017 from Fuzhou University, and continued his visiting scholar study at the National University of Singapore (NUS) and postdoctoral research at Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (China). His research interests focus on the luminescent nanomaterials and bioapplications.
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Yang, K., Yang, Y., Sun, D. et al. Designing highly UV-emitting lanthanide nanoscintillators for in vivo X-ray-activated tumor therapy. Sci. China Mater. 66, 4090–4099 (2023). https://doi.org/10.1007/s40843-023-2548-8
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DOI: https://doi.org/10.1007/s40843-023-2548-8