荧光
炎症性肠病
DNA
纳米团簇
多路复用
溃疡性结肠炎
序列(生物学)
碱基对
分子生物学
化学
生物
材料科学
医学
纳米技术
生物信息学
遗传学
病理
疾病
物理
光学
作者
Bo Zheng,Binhui Pan,Shaohua Xu,Zhihua Xu,Guangrong Lu,Fangyan Wang,Biyun Fang,Chunyan Xu
标识
DOI:10.1016/j.saa.2022.121185
摘要
Researches demonstrated that circulating miRNAs could be used as novel diagnostic and prognostic potential markers for patients with inflammatory bowel diseases (IBD). It is of great significance in clinical to develop rapid and specific detection methods for miRNAs. Herein, we established a fluorescent probe for ulcerative colitis (UC) activity-associated two serum biomarkers (miR-23a and miR-223) simultaneous detection, which used multi-color fluorescent DNA-stabilized silver nanoclusters (DNA-AgNC) illuminated by a close guanine (G)-rich sequence as a signal transducer and two split DNA probes as recognition units. In principle, the two DNA probe sequences containing AgNC nucleation sequence and G-rich sequence respectively, formed a ternary complex when in the presence of target miRNA through base pairing, so as to induce enhancement of fluorescence emission of AgNC by shortening the distance from G-rich sequence. The combined probes for miR-23a and miR-223 detection generated increased fluorescence signals at 460 nm ex/545 nm em and at 560 nm ex/630 nm em, respectively. With this technique, we successfully quantified the two target miRNAs with high selectivity. Furthermore, the potential clinic applicability of this method was verified by testing the spiked standard miRNAs in human serum. Thus, this one-step, low-cost, and homogenous method offers a great opportunity for disease-associated multiplex miRNAs simultaneous detection.
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