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文章编号: 1672-6987(2025)04-0012-09DOI: 10.16351/j.1672-6987.2025.04.002
李甜甜, 何鹏*, 李东祥(青岛科技大学 化学与分子工程学院, 山东 青岛 266042)
摘要: 活细胞中低水平miRNA检测的扩增策略对于肿瘤生物标志物的精准检测具有重要意义。因此在本工作中设计了一种在活细胞内利用h-BNNS和四向催化发夹组装(FCHA)技术进行miRNA-21成像的扩增策略。具有低细胞毒性的h-BNNS作为优异的载体和荧光猝灭剂,将修饰有FAM的发夹DNA递送至细胞内。在细胞内miRNA-21的存在下,触发FCHA反应形成十字型DNA结构,以减弱DNA和h-BNNS之间的作用力,同时在一个DNA纳米产物上实现多个荧光信号的标记提高了检测的准确度。这种方法为活细胞内miRNA的超灵敏检测提供了强有力的工具,检测限低至0.5 pmol · L-1。
关键词: h-BNNS; FCHA; miRNA检测; 可视化成像
中图分类号: O 657.3 文献标志码: A
引用格式: 李甜甜, 何鹏, 李东祥. 四向催化发夹组装用于活细胞中miRNA的精准检测[J]. 青岛科技大学学报(自然科学版), 2025, 46(4): 12-20.
LI Tiantian, HE Peng, LI Dongxiang. Four-way catalytic hairpin assembly for precise detection of miRNA in living cells[J]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2025, 46(4): -.
Four-Way Catalytic Hairpin Assembly for Precise Detection of miRNA in Living Cells
LI Tiantian, HE Peng, LI Dongxiang(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract: The amplification strategy of low level miRNA detection in living cells is of great significance for the accurate detection of tumor biomarkers. This work was designed an amplification strategy for miRNA-21 imaging using h-BNNS and four-way catalytic hairpin assembly(FCHA)in living cells. As an excellent carrier and fluorescence quencher, h-BNNS with low cytotoxicity delivers hairpin DNA modified with FAM into cells. In the presence of miRNA-21, the FCHA reaction is triggered to form a cross DNA structure for weakening the force between DNA and h-BNNS. At the same time, the labeling of multiple FAM signal on a DNA nanoproduct improves the detection accuracy. This method provides a powerful tool for the ultra-sensitive detection of miRNA in living cells, and the detection limit is as low as 0.5 pmol · L-1.
Key words: h-BNNS; FCHA; miRNA detection; visual imaging
收稿日期: 2024-08-22
基金项目: 国家自然科学基金项目(21975139).
作者简介: 李甜甜(1997—), 女, 硕士研究生. * 通信联系人.