基于点击化学的同步辐射X射线成像标签★

doi:10.6023/A23030061

化学学报 ›› 2023, Vol. 81 ›› Issue (5): 441-444.DOI: 10.6023/A23030061 上一篇下一篇

所属专题：庆祝《化学学报》创刊90周年合辑

研究通讯

基于点击化学的同步辐射X射线成像标签^★

汤乔伟^a^,^d^,^f, 蔡小青^a^,^e^,^f, 殷大鹏^a^,^f, 孔华庭^e, 张祥志^e, 张继超^e, 闫庆龙^d, 诸颖^a^,^b^,^f, 樊春海^c

a 中国科学院上海应用物理研究所中国科学院微观界面物理与探测重点实验室上海 201800
b 上海大学理学院化学系材料生物学研究所上海 200444
c 上海交通大学化学化工学院上海 200025
d 祥符实验室嘉善 314102
e 中国科学院上海高等研究院基础交叉研究中心上海同步辐射光源张江实验室上海 201210
f 中国科学院大学北京 100049

投稿日期:2023-03-02 发布日期:2023-04-11
作者简介:
^†汤乔伟、蔡小青、殷大鹏为本文共同第一作者
^★ 庆祝《化学学报》创刊90周年.
基金资助:
受国家重点研发计划(2022YFA1603600); 国家自然科学基金(22022410); 国家自然科学基金(82050005); 上海市2022年度“科技创新行动计划”基础研究领域项目(22JC1401203); 中科院青年创新促进会(2016236)

Click Chemistry-based Synchrotron X-ray Imaging Tags^★

Tang Qiaowei^a^,^d^,^f, Cai Xiaoqing^a^,^e^,^f, Yin Dapeng^a^,^f, Kong Huating^e, Zhang Xiangzhi^e, Zhang Jichao^e, Yan Qinglong^d, Zhu Ying^a^,^b^,^f, Fan Chunhai^c

a Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800
b Institute of Materials Biology, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444
c School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200025
d Xiangfu Laboratory, Jiashan 314102
e The Interdisciplinary Research Center, Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210
f University of Chinese Academy of Sciences, Beijing 100049

Received:2023-03-02 Published:2023-04-11
Contact: *E-mail: zhuying@sinap.ac.cn, fanchunhai@sjtu.edu.cn
About author:
^†These authors contributed equally to this work.
^★Dedicated to the 90th anniversary of Acta Chimica Sinica
Supported by:
National Key Research and Development Program of China(2022YFA1603600); National Natural Science Foundation of China(22022410); National Natural Science Foundation of China(82050005); 2022 Shanghai “Science and Technology Innovation Action Plan” Fundamental Research Project(22JC1401203); Youth Innovation Promotion Association CAS(2016236)

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摘要/Abstract

基于同步辐射的X射线显微成像技术具有高空间分辨率和良好的能量(元素)分辨能力, 在细胞内生物分子的识别和成像中具有很大的应用潜力. 然而, 目前已发展的与同步辐射X射线显微技术相适合的对细胞内多种生命靶标同时进行识别与成像的探针技术仍较缺乏. 本工作应用X射线具有良好的能量分辨、且元素谱间互不干扰的特点, 可控合成聚多巴胺(PDA)纳米颗粒, 在PDA纳米颗粒上修饰叠氮基并螯合金属离子, 发展了基于点击化学的同步X射线成像标签(PDA-N₃-Metal), 并以30 nm的成像分辨率对该标签进行同步辐射X射线成像. 研究结果为进一步制备基于点击化学的X射线探针, 实现同时对细胞内多种生物分子的特异性识别和成像打下了良好的基础.

关键词: 聚多巴胺, 点击化学, 同步X射线, 金属, 成像标签

One of the basic goals of cell biology is to identify multiple biological molecules within cells and understand the complex interactions between biological molecules in cellular life activities. Synchrotron-based X-ray microscopy has high spatial resolution and good energy (element) resolution, which has great application potential in the recognition and imaging of intracellular biomolecules. At present, the probes that have been developed for synchrotron-based X-ray microscopy are mainly immunostaining probes and genetic labeling probes. Immunostaining probes are prone to lead to cross-reactions due to their dependence on antigen-antibody reactions. The genetic labeling probes, based on gene coding tags, catalyze the generation of X-ray sensitive polymers. However, the polymers used to provide X-ray imaging signals have no fixed morphology. When it is applied to cell imaging, the positioning accuracy will be reduced due to the diffusion of tags in cells, which is an inherent defect of such imaging tags. In addition, there are few existing systems that can express each other independently and step by step for this type of probe. Therefore, both types of X-ray probes mentioned above are difficult to achieve simultaneous high-resolution imaging observation of multiple biological target molecules in cellular life activities. In this research paper, by using the characteristics of X-ray that has good energy resolution and does not interfere with each other between element spectra, we can synthesize polydopamine (PDA) nanoparticles in a controlled manner, modify azide groups on PDA nanoparticles and chelate metal ions, develop a click chemistry based synchronous X-ray imaging tag (PDA-N₃-Metal), and conduct synchrotron radition X-ray imaging on the tag with an imaging resolution of 30 nm. The research results lay a good foundation for further preparation of X-ray probes based on click chemistry, and for realizing the specific recognition and imaging of multiple biological molecules in cells at the same time.

Key words: polydopamine, click chemistry, synchrotron-based X-ray, metal, imaging tag

引用此文

汤乔伟, 蔡小青, 殷大鹏, 孔华庭, 张祥志, 张继超, 闫庆龙, 诸颖, 樊春海. 基于点击化学的同步辐射X射线成像标签^★[J]. 化学学报, 2023, 81(5): 441-444.

Tang Qiaowei, Cai Xiaoqing, Yin Dapeng, Kong Huating, Zhang Xiangzhi, Zhang Jichao, Yan Qinglong, Zhu Ying, Fan Chunhai. Click Chemistry-based Synchrotron X-ray Imaging Tags^★[J]. Acta Chimica Sinica, 2023, 81(5): 441-444.

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图/表 4

图1. PDA纳米颗粒经修饰叠氮基和螯合金属离子生成基于同步辐射X射线的成像标签示意图

Figure 1. Schematic showing of the PDA nanoparticles modified with azide and chelated metal ions as a synchrotron X-ray imaging tags

28%氨水的使用量	0.4 mL	0.6 mL	1 mL	1.5 mL	2 mL
PDA纳米颗粒的粒径	762.5± 92.3 nm	507.6± 59.4 nm	283.5± 37.3 nm	177.0± 25.7 nm	136.9± 21.0 nm

表1. 氨水对PDA纳米颗粒粒径的影响

Table 1. Effect of ammonia on particle size of the PDA nanoparticles

图2. PDA-N3-Cu (a, b)和PDA-N3-Fe (c, d)的电镜成像及能谱

Figure 2. Electron microscopy imaging and energy spectrum of PDA-N3-Cu (a, b) and PDA-N3-Fe (c, d)

图3. PDA-N3-Cu在X射线能量为938.8 eV (a, d)和942.8 eV (b, e)的图像和双能图像(c, f)以及星形标准靶的X射线成像(g). 比例尺: 100 nm

Figure 3. Images of PDA-N3-Cu at X-ray energies of 938.8 eV (a, d) and 942.8 eV (b, e) and dual-energy images (c, f). X-ray imaging of a test star pattern sample (g). Scale: 100 nm

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基于点击化学的同步辐射X射线成像标签^★

Click Chemistry-based Synchrotron X-ray Imaging Tags^★