Abstract
The present study shows that a dual-signal nanoprobe consisting of DNAzyme-functionalized porous carbon nanospheres (PCNs) responds to microRNA-21 and zinc ion (Zn2+). The fluorescent probe undergoes an increase in the fluorescence intensity of fluorescein isothiocyanate (FITC) (with excitation/emission wavelengths at 488/517 nm) and the fluorescence intensity of cyanine-5 (Cy5) (with excitation/emission wavelengths at 633/670 nm) in the presence of microRNA-21 and Zn2+. The recognition between microRNA-21 and its complementary strand in the PCNs induces the separation of Zn2+-specific DNAzyme from PCNs, thus resulting in the increase of green fluorescence, and the exogenous Zn2+ triggers the rupture of cleavage strand of DNAzyme and recovery of red fluorescence. This nanoprobe allows us to acquire in vitro the determination of microRNA-21 in the range of 2–300 nM with a detection limit of 0.57 nM and the determination of Zn2+ in the range 2–100 nM with a detection limit of 0.43 nM, and in situ simultaneous imaging in MCF-7 breast cancer cells. Therefore, this strategy permits to obtain the expression levels of different biomarkers in living cells, providing a useful tool for diagnosis of cancers and understanding their biological process.
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Acknowledgments
The authors greatly acknowledge support from the Project Fund for Shangdong Key R&D Program (2017GGX20121). In addition, Xiaoting Ji particularly wishes to thank Zhan Xiao, whose sincere personality has given her powerful spiritual impetus to overcome various difficulties in her doctoral research.
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Ji, X., Wang, Z., Niu, S. et al. DNAzyme-functionalized porous carbon nanospheres serve as a fluorescent nanoprobe for imaging detection of microRNA-21 and zinc ion in living cells. Microchim Acta 187, 249 (2020). https://doi.org/10.1007/s00604-020-04226-6
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DOI: https://doi.org/10.1007/s00604-020-04226-6