期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 331, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.129399
关键词
Circulating tumor cells (CTCs); Magnetic separation; Carbon dots (CDs); Cobalt oxyhydroxide nanosheets (CoOOH); Sandwich-Like cytosensor
资金
- National Natural Science Foundation of China [81772280, 21804015]
- Chongqing Graduate Research Innovation Project [CYB19153]
- Natural Science Foundation Project of CQ CSTC [cstc2018jcyjAX0206]
In this study, a new cytosensor was developed for ultrasensitive and specific detection of circulating tumor cells (CTCs) using aptamers-modified magnetic beads and carbon dots/cobalt oxyhydroxide nanosheets systems. The cytosensor successfully detected MCF-7 cells with a wide dynamic range and low limit of detection, showcasing its potential in ultrasensitive CTCs detection in clinical diagnosis.
As a part of tumor fluid biopsy', circulating tumor cells (CTCs) contain enormous tumor information, so the detection of CTCs is very helpful in clinical diagnosis and therapy. Here, we applied aptamers-modified magnetic beads (Apt@MBs) and carbon dots/cobalt oxyhydroxide nanosheets systems (CDs/CoOOH) to develop a new cytosensor for ultrasensitive and specific detection of CTCs. At first, amino-modified magnetic beads (MBs) were cross-linked with carboxyl-modified MUC1 aptamers (Apt) to gain Apt@MBs. Then, folic acid (FA) functionalized carbon dots (FA@CDs) were assembled onto cobalt oxyhydroxide nanosheets (CoOOH) to obtain FA@CDs/CoOOH with fluorescence quenching. In the detection systems, Apt@MBs identified and accumulated MCF-7 cells, forming Apt@MBs/MCF-7 cells, which then combined with FA@CDs/CoOOH to obtain sandwich-like Apt@MBs/MCF-7 cells/FA@CDs/CoOOH. Finally, ascorbic acid (AA) decomposed CoOOH to release carbon dots (CDs), and the fluorescence of abundant CDs act as efficient signal output. The cytosensor detected MCF-7 cells with a wide dynamic range (10 similar to 10(5) cells/mL) and a low limit of detection (5 cells/mL), owing to the specific identification and effective enrichment of Apt@MBs as well as anti-interference capability and signal amplification of FA@CDs/CoOOH. Most importantly, the cytosensor successfully discriminated MCF-7 cells from white blood cells, exhibiting potentiality in ultrasensitive CTCs detection in clinical diagnosis.
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