Journal
BIOSENSORS & BIOELECTRONICS
Volume 77, Issue -, Pages 435-441Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2015.09.069
Keywords
MicroRNAs; Catalytic hairpin assembly; Streptavidin aptamer; DNA-nanotechnology; Surface plasmon resonance
Categories
Funding
- National Natural Science Foundation of China [81371904]
- Natural Science Foundation [CSTC2013jjB10019]
- Application Development Plan Project of Chongqing [cstc2014yykfB10003]
- Science and Technology Plan Project of Yuzhong District of Chongqing [20120212]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1413449] Funding Source: National Science Foundation
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MicroRNAs (miRNAs) play significant regulatory roles in a variety of diseases and have been emerging as a group of promising biomarkers in cancer cells. Here, a novel and simple surface plasmon resonance (SPR) biosensor was developed for specific and highly sensitive detection of target miRNA employing the mismatched catalytic hairpin assembly (CHA) amplification coupling with programmable streptavidin aptamer (SA-aptamer). The presence of target miRNA triggered the allosteric effect of CHA amplification, which brought about the recycling of the target miRNA and produced large amounts of CHA products and activated SA-aptemers. Meanwhile, the plentiful CHA products could hybridize with the capture probes on the sensor chip, and the massive activated SA-aptamers could capture the streptavidin to achieve enhancement and output of the detection signal. Benefiting from the outstanding performance of the enzyme-free CHA amplification and non-label SPR biosensor, the established biosensor exhibited simplified process, high sensitivity and good selectivity. Under the optimal conditions, this designed strategy could detect target miRNA down to 1 pM with a dynamic range from 5 pM to 100 nM, and was successfully applied to the determination of target miRNA spiked into human total RNA samples. Thus, this SPR-based biosensor might become a potential alternative tool for miRNA detection in medical research and early clinical diagnosis. (C) 2015 Elsevier B.V. All rights reserved.
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