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Microchimica Acta

, 185:403 | Cite as

Molecular beacon-templated silver nanoclusters as a fluorescent probe for determination of bleomycin via DNA scission

  • Xiaolu Yan
  • Jing Sun
  • Xian-En Zhao
  • Renjun Wang
  • Xiao Wang
  • Ya-Nan Zuo
  • Wei Liu
  • Rongmei Kong
  • Shuyun Zhu
Original Paper
  • 206 Downloads

Abstract

The authors describe a molecular beacon-based fluorescent probe for the determination of the cancer drug bleomycin (BLM). The probe was tagged with DNA-templated silver nanoclusters (DNA-AgNCs) and guanine-rich sequences (GRSs) at two terminals serving as signal reporter with a loop. In the absence of the BLM-iron(II) complex [BLM-Fe(II)], the probe has a hairpin shape and displays strong fluorescence because the AgNCs are close to the GRSs. In the presence of the BLM-Fe(II) complex, it will selectively cleave the probe at the 5’-GC-3′ scission site of the loop. This displaces the AgNCs away from the GRSs and causes a decrease in fluorescence, best measured at excitation/emission wavelengths of 565/623 nm. This effect enables BLM to be detected with a detection limit as low as 33 pM, which was 1–3 orders of magnitude more sensitive than most of the previous reports. The probe was applied for the determination of BLM in spiked human serum samples, and excellent performance was achieved. In our perception, the method described here represents a promising tool for highly sensitive and specific analysis of BLM during cancer treatment.

Graphical abstract

Schematic of a highly sensitive fluorometric assay forbleomycin. It is based on molecular beacon-templated silver nanoclusters and DNA scission.

Keywords

Fluorescence DNA-templated synthesis Silver nanoclusters Bleomycin Guanine-rich sequence Antitumor drug DNA scission 

Notes

Acknowledgements

This work is kindly supported by the National Natural Science Foundation of China (Nos. 21405094, 21775088, and 81403051), the Natural Science Foundation of Shandong Province (Nos. ZR2017MC037, ZR2017QB008), the Natural Science Foundation of Qinghai Province of China (2016-ZJ-955), and the Development Project of Qinghai Key Laboratory (No. 2017-ZJ-Y10), and the Open Funds of Shandong Key Laboratory of TCM Quality Control Technology of Shandong Academy of Sciences. We also thank Xiaoqing Qu for her good advice in the design of DNA.

Compliance with ethical standards

The authors declare that they have no competing interest.

Supplementary material

604_2018_2939_MOESM1_ESM.doc (230 kb)
ESM 1 (DOC 230 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  1. 1.College of Chemistry and Chemical EngineeringQufu Normal UniversityQufuChina
  2. 2.Qinghai Key Laboratory of Qinghai-Tibet Plateau Biological Resources, Northwest Institute of Plateau BiologyChinese Academy of SciencesXining CityChina
  3. 3.College of Life ScienceQufu Normal UniversityQufuChina
  4. 4.Shandong Key Laboratory of TCM Quality Control Technology, Shandong Analysis and Test CenterQilu University of Technology (Shandong Academy of Sciences)JinanChina

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