Abstract
A simple nanoplatform based on molybdenum disulfide (MoS2) nanosheets, a fluorescence quencher (signal off), and a hybridization chain reaction (HCR) signal amplification (signal on) used for the enzyme-free, label-free, and low-background signal quantification of microRNA-21 in plasma exosome is reported. According to the sequence of microRNA-21, carboxy-fluorescein (FAM)-labeled hybridization probe 1 (FAM-H1) and hybridization probes 2 (FAM-H2) were designed with excitation maxima at 488 nm and emission maxima at 518 nm. MoS2 nanosheets could adsorb FAM-H1 and FAM-H2 and quenched their fluorescence signals to reduce the background signal. However, HCR was triggered when microRNA-21 was present. Consequently, HCR products containing a large number of FAM fluorophores can emit a strong fluorescence at 518 nm and could realize the detection of microRNA-21 as low as 6 pmol/L and had a wide linear relation of 0.01–25 nmol/L. This assay has the ability of single-base mismatch recognition and could identify microRNA-21 with high specificity. Most importantly, this approach was successfully applied to the detection of plasma exosomal microRNA-21 in patients with lung cancer, and it is proposed that other targets can also be detected by changing the FAM-H1 and FAM-H2 corresponding to the target sequence. Thus, a novel, hands-on strategy for liquid biopsy was proposed and has a potential application value in the early diagnosis of lung cancer.
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This research was supported by the National Natural Science Foundation of China (No. 81973099).
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Conceptualization: Yongjun Wu. Methodology: Yanhua Mao and Jinlan Wei. Formal analysis and investigation: Jinlan Wei, Longjie Wu. Writing, original draft preparation: Sitian He and Jinlan Wei. Writing review and editing: Yongjun Wu, Hongchao Guo, Clement Yaw Effah, Jinlan Wei, Xinlian Liu. Resources: Yanhua Mao, Sitian He, Jinlan Wei, Yongjun Wu. Supervision: Yongjun Wu, Sitian He.
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Wei, J., He, S., Mao, Y. et al. A simple “signal off–on” fluorescence nanoplatform for the label-free quantification of exosome-derived microRNA-21 in lung cancer plasma. Microchim Acta 188, 397 (2021). https://doi.org/10.1007/s00604-021-05051-1
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DOI: https://doi.org/10.1007/s00604-021-05051-1