DNA
适体
化学
互补DNA
双模
荧光染料
纳米技术
生物物理学
组合化学
分子生物学
聚合酶链反应
材料科学
生物化学
生物
基因
航空航天工程
工程类
作者
Jiaying Zhao,Yanyi Long,Congjuan He,Yinjiang Leng,Zhen Huang,Yi Ma,Changjun Hou,Ya Zhang
标识
DOI:10.1016/j.cej.2023.147513
摘要
Circulating tumor cells (CTCs) monitoring as a means of liquid biopsy can be effective in aiding the diagnosis, treatment monitoring, and prognosis of cancer. Herein, we fabricated a dual-mode cytosensor for ultrasensitive detection of CTCs via DNA walker powered by a DNA circuit and MOF-on-MOF nanozyme. The anti-EpCAM aptamer was hybridized with complementary DNA (cDNA) and modified onto the magnetic nanospheres (MNs). In the presence of CTCs, cDNA strand can be released by cell-aptamer specific recognition and was separated through a magnet to trigger the subsequent DNA walking process. In the DNA walking process, the cDNA strand could trigger cascade toehold-mediated DNA displacement reactions by fuel nanozyme-functionalized DNA strands and recycle to further accelerate the DNA circuit thus amplifying the output signal. What's more, since the MOF-on-MOF nanozyme had good peroxidase activity, electrochemical and colorimetric dual-mode signal output can be achieved in the presence of 3,3′,5,5′-tetramethylbenzidine (TMB) and hydrogen peroxide (H2O2) for CTCs determination through an ITO chamber. As a proof of concept, by virtue of the outstanding synergistic signal amplification of DNA walker and MOF-on-MOF nanozymes, the designed dual-mode cytosensor exhibited a comprehensive linear range of 5 to 5 × 105 cells/mL and a sensitivity of 5 cells/mL and performed well in complex environment. This work provided important references for further investigations on CTC-related diagnosis and individualized treatment.
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