Reversible Ratiometric Electrochemiluminescence Biosensor Based on DNAzyme Regulated Resonance Energy Transfer for Myocardial miRNA Detection

Myocardial miRNAs in peripheral blood are closely related to the pathogenic process of myocardial infarction. Rapid identification and accurate quantification of myocardial miRNAs are of great significance to clinical interventions for treating cardiovascular lesions. Therefore, a ratiometric electr...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2022-05, Vol.94 (19), p.7035-7040
Main Authors: Sun, Yudie, Fang, La, Han, Yunxiang, Feng, Aobo, Liu, Shengjun, Zhang, Kui, Xu, Jing-Juan
Format: Article
Language:English
Subjects:
Biosensors
Cadmium tellurides
Chemistry
DNA probes
Electrochemiluminescence
Emitters
Energy transfer
miRNA
Myocardial infarction
Nanoparticles
Peripheral blood
Quantum dots
Resonance
Silica
Substrates
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Summary:Myocardial miRNAs in peripheral blood are closely related to the pathogenic process of myocardial infarction. Rapid identification and accurate quantification of myocardial miRNAs are of great significance to clinical interventions for treating cardiovascular lesions. Therefore, a ratiometric electrochemiluminescence (ECL) biosensor integrating DNAzyme with a resonance energy transfer (RET) system was designed to detect myocardial miRNA. The dual-signal system was composed of rA marked substrate strand functionalized CdTe quantum dots (QDs) as reductive–oxidative (R–O) emitters and Cy5-labeled strand-functionalized Ru­(bpy)3 2+-filled silica nanoparticles (RuSi NPs) as oxidative–reductive (O–R) emitters. In the presence of target miRNA, DNAzyme was activated to cut substrate strands on the CdTe QDs and release triggers for opening hairpin probes. Then, the Cy5 molecule-labeled hairpin DNA on the RuSi NPs was opened to introduce Cy5 molecules and RuSi NPs into the system. The R–O ECL was quenched by ECL-RET between CdTe QDs and Cy5 molecules and the O–R ECL was introduced by the RuSi NPs. In this way, based on the simultaneous changing of the ECL signal, the dual-potential dynamic signal ratiometric ECL sensing platform was developed. By measuring the ratio of O–R ECL signal to R–O ECL signal, the concentration of miRNA-499 was accurately quantified in the range of 10 fM to 10 nM, and the detection limit was as low as 2.44 fM (S/N = 3). This DNAzyme guided dual-potential ratiometric ECL method provides a sensitive and reliable method for myocardial miRNA detection, and it has great potential in clinical diagnosis and treatment.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.2c00195