Imaging Endogenous Metal Ions in Living Cells Using a DNAzyme-Catalytic Hairpin Assembly Probe.
Imaging Endogenous Metal Ions in Living Cells Using a DNAzyme-Catalytic Hairpin Assembly Probe.
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DOI:
10.1002/anie.201703540
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发表时间:
2017-07-17
期刊:
影响因子:
--
通讯作者:
Lu Y
中科院分区:
文献类型:
--
作者:
Wu Z;Fan H;Satyavolu NSR;Wang W;Lake R;Jiang JH;Lu Y
DNAzymes have been shown as a promising platform for metal ions detection and a few DNAzyme-based sensors have been reported to detect metal ions inside cells. However, these methods required an influx of metal ions to increase their concentrations for detection. To address this major issue, we herein report the design of a catalytic hairpin assembly (CHA) reaction to amplify the signal from photocaged Na+-specific DNAzyme to detect endogenous Na+ inside cells. Upon light activation and in the presence of Na+, NaA43 DNAzymes cleave the substrate strands and release initiator DNA that trigger the followed CHA amplification reaction. This strategy has allowed detection of endogenous Na+ inside cells, which has been demonstrated by both fluorescent imaging of individual cells and flow cytometry of the whole cell population. This method can be generally applied to detect other endogenous metal ions and thus contribute to deeper understanding of the role of metal ions in biological systems. DNAzyme-Catalytic Hairpin Assembly (DzCHA) Probe: we designed a catalytic hairpin assembly (CHA) reaction to amplify the signal from photocaged Na+-specific DNAzyme cleavage to detect endogenous Na+ inside cells. Upon light activation and in the presence of Na+, NaA43 DNAzymes cleave the substrate strands and release initiator DNA that can trigger the CHA signal amplification reaction.
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