期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 33, 页码 14115-14119出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005974
关键词
aptamers; circulating tumor cells; DNA nanostructures; microfluidics; nanolithography
资金
- National Natural Science Foundation of China [21874089, 21735004, 21705024, 21927806]
- Innovative Research Team of High-level Local Universities in Shanghai [SSMU-ZLCX20180701]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13036]
Microfluidic chips with nano-scale structures have shown great potential, but the fabrication and cost issues restrict their application. Herein, we propose a conceptually new DNA nanolithography in a microfluidic chip by using sub-10 nm three-dimensional DNA structures (TDNs) as frameworks with a pendant aptamer at the top vertex (ApTDN-Chip). The nano-scale framework ensures that the aptamer is in a highly ordered upright orientation, avoiding the undesired orientation or crowding effects caused by conventional microfluidic interface fabrication processes. Compared with a monovalent aptamer modified chip, the capture efficiency of ApTDN-Chip was enhanced nearly 60 % due to the highly precise dimension and rigid framework of TDNs. In addition, the scaffolds make DNase I more accessible to the aptamer with up to 83 % release efficiency and 91 % cell viability, which is fully compatible with downstream molecular analysis. Overall, this strategy provides a novel perspective on engineering nano-scaffolds to achieve a more ordered nano-topography of microfluidic chips.
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