期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 24, 页码 6798-6802出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201701325
关键词
DNAzymes; gold nanoshells; HeLa cells; metal ions; photothermal activation
资金
- US National Institutes of Health (NIH) [R21MH110975]
- National Natural Science Foundation [21335004]
- Chinese Scholarship Council
DNAzymes have enjoyed success as metal ion sensors outside cells. Their susceptibility to metal-dependent cleavage during delivery into cells has limited their intracellular applications. To overcome this limitation, a near-infrared (NIR) photothermal activation method is presented for controlling DNAzyme activity in living cells. The system consists of a three-stranded DNAzyme precursor (TSDP), the hybridization of which prevents the DNAzyme from being active. After conjugating the TSDP onto gold nanoshells and upon NIR illumination, the increased temperature dehybridizes the TSDP to release the active DNAzyme, which then carries out metal-ion-dependent cleavage, resulting in releasing the cleaved product containing a fluorophore. Using this construct, detecting Zn2+ in living HeLa cells is demonstrated. This method has expanded the DNAzyme versatility for detecting metal ions in biological systems under NIR light that exhibits lower phototoxicity and higher tissue penetration ability.
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