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Meng X, Zhang K, Dai W, Cao Y, Yang F, Dong H, Zhang X. Multiplex microRNA imaging in living cells using DNA-capped-Au assembled hydrogels. Chem Sci 2018; 9:7419-7425. [PMID: 30542546 PMCID: PMC6237120 DOI: 10.1039/c8sc02858c] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 08/06/2018] [Indexed: 12/14/2022] Open
Abstract
Non-invasively imaging multiplex microRNAs (miRNAs) in living cells is pivotal to understanding their physiological functions and pathological development due to the key regulatory roles of miRNAs in gene expression. However, developing smart delivery systems with large gene loading capacity, biocompatibility and responsiveness remains a significant challenge. Herein, we successfully incorporated DNA-capped Au nanoparticles (NPs) and their complementary fluorescent DNA sequences into a porous 3D hydrogel network (AuDH), in which hairpin-locked DNAzyme strands and active metal ions were loaded (AuDH/M n+/H) for simultaneously imaging multiplex miRNAs in living cells. After transfection into cells, the specific miRNAs trigger the strand-displacement reaction and sequentially activate the DNAzyme-assisted target recycling, leading to a strong increase in the corresponding fluorescence intensity for imaging. This enables simultaneous assessment of the abundance of multiplex cancer-related miRNAs, even if at a very low expression level, in different cells through the different fluorescence intensities due to the dual signal amplification, and the change in abundance of miRNAs induced by siRNA or miRNA mimics in living cells can also be efficiently monitored. The versatile and responsive DNA hydrogel system holds great potential for miRNA biomedical applications.
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Affiliation(s)
- Xiangdan Meng
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
| | - Kai Zhang
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
| | - Wenhao Dai
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
| | - Yu Cao
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
| | - Fan Yang
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
| | - Haifeng Dong
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
| | - Xueji Zhang
- Beijing Key Laboratory for Bioengineering and Sensing Technology , Research Center for Bioengineering and Sensing Technology , School of Chemistry and Biological Engineering , University of Science & Technology Beijing , Beijing 100083 , P. R. China . ;
- Beijing Advanced Innovation Center for Materials Genome Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China
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Cai W, Xie S, Zhang J, Tang D, Tang Y. Immobilized-free miniaturized electrochemical sensing system for Pb2+ detection based on dual Pb2+-DNAzyme assistant feedback amplification strategy. Biosens Bioelectron 2018; 117:312-318. [DOI: 10.1016/j.bios.2018.06.020] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 05/31/2018] [Accepted: 06/07/2018] [Indexed: 01/25/2023]
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Yang YY, He MQ, Li MX, Huang YQ, Chi T, Wang ZX. Ferrimagnetic copper-carboxyphosphinate compounds for catalytic degradation of methylene blue. INORG CHEM COMMUN 2018. [DOI: 10.1016/j.inoche.2018.05.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Practical Application of Aptamer-Based Biosensors in Detection of Low Molecular Weight Pollutants in Water Sources. Molecules 2018; 23:molecules23020344. [PMID: 29414854 PMCID: PMC6017897 DOI: 10.3390/molecules23020344] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 01/30/2018] [Accepted: 01/30/2018] [Indexed: 01/08/2023] Open
Abstract
Water pollution has become one of the leading causes of human health problems. Low molecular weight pollutants, even at trace concentrations in water sources, have aroused global attention due to their toxicity after long-time exposure. There is an increased demand for appropriate methods to detect these pollutants in aquatic systems. Aptamers, single-stranded DNA or RNA, have high affinity and specificity to each of their target molecule, similar to antigen-antibody interaction. Aptamers can be selected using a method called Systematic Evolution of Ligands by EXponential enrichment (SELEX). Recent years we have witnessed great progress in developing aptamer selection and aptamer-based sensors for low molecular weight pollutants in water sources, such as tap water, seawater, lake water, river water, as well as wastewater and its effluents. This review provides an overview of aptamer-based methods as a novel approach for detecting low molecular weight pollutants in water sources.
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Li Q, Jia Y, Feng Z, Liu F. A highly sensitive and selective fluorescent probe without quencher for detection of Pb2+ ions based on aggregation-caused quenching phenomenon. RSC Adv 2018; 8:38929-38934. [PMID: 35558300 PMCID: PMC9090614 DOI: 10.1039/c8ra07903j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Accepted: 11/06/2018] [Indexed: 11/21/2022] Open
Abstract
Lead is a highly toxic heavy metal, and various functional nucleic acid (FNA)-based biosensors have been developed for the detection of Pb2+ in environmental monitoring. However, most fluorescence biosensors that have been reported were designed on the basis of a double-labeled (fluorophore and quencher group) DNA sequence, which not only involved an inconvenient organic synthesis but also restricted their wider use in practical applications. Here, we utilized a G-rich DNA sequence as a recognition probe and conjugated fluorene (CF) to develop a fluorescence sensor without a quencher based on the aggregation-caused quenching (ACQ) effect. In the presence of Pb2+, the degree of aggregation of CF was reduced because Pb2+ induced the formation of a G-quadruplex structure of the CF-DNA probe, and the fluorescence signal increased with the concentration of Pb2+ (0–1 μM), with a limit of detection of 0.36 nM. This fluorescent probe without a quencher enables the sensitive and selective detection of Pb2+. On the basis of these advantages, the CF-DNA probe represents a promising analytical method for detecting Pb2+. Fluorescent probe with only a fluorophore but no quencher for detecting Pb2+ on the basis of the aggregation-caused quenching (ACQ) phenomenon.![]()
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Affiliation(s)
- Qianyun Li
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510640
- China
- Institute for Advanced Materials
| | - Yongmei Jia
- Institute for Advanced Materials
- Lingnan Normal University
- Zhanjiang 524048
- China
| | - Zongcai Feng
- Institute for Advanced Materials
- Lingnan Normal University
- Zhanjiang 524048
- China
| | - Fang Liu
- School of Materials Science and Engineering
- South China University of Technology
- Guangzhou 510640
- China
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Fang X, Zong B, Mao S. Metal-Organic Framework-Based Sensors for Environmental Contaminant Sensing. NANO-MICRO LETTERS 2018; 10:64. [PMID: 30393712 PMCID: PMC6199112 DOI: 10.1007/s40820-018-0218-0] [Citation(s) in RCA: 230] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 06/24/2018] [Indexed: 05/18/2023]
Abstract
Increasing demand for timely and accurate environmental pollution monitoring and control requires new sensing techniques with outstanding performance, i.e., high sensitivity, high selectivity, and reliability. Metal-organic frameworks (MOFs), also known as porous coordination polymers, are a fascinating class of highly ordered crystalline coordination polymers formed by the coordination of metal ions/clusters and organic bridging linkers/ligands. Owing to their unique structures and properties, i.e., high surface area, tailorable pore size, high density of active sites, and high catalytic activity, various MOF-based sensing platforms have been reported for environmental contaminant detection including anions, heavy metal ions, organic compounds, and gases. In this review, recent progress in MOF-based environmental sensors is introduced with a focus on optical, electrochemical, and field-effect transistor sensors. The sensors have shown unique and promising performance in water and gas contaminant sensing. Moreover, by incorporation with other functional materials, MOF-based composites can greatly improve the sensor performance. The current limitations and future directions of MOF-based sensors are also discussed.
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Affiliation(s)
- Xian Fang
- Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, People's Republic of China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, People's Republic of China
| | - Boyang Zong
- Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, People's Republic of China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, People's Republic of China
| | - Shun Mao
- Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, People's Republic of China.
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, People's Republic of China.
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