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Wu Y, Gao Z, Chai Y, Zhang A, He S, Liu X, Yuan H, Tan L, Ding L, Wu Y. One-step and label-free ratiometric fluorescence assay for the detection of plasma exosome towards cancer diagnosis. Talanta 2024; 271:125700. [PMID: 38277965 DOI: 10.1016/j.talanta.2024.125700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 01/01/2024] [Accepted: 01/18/2024] [Indexed: 01/28/2024]
Abstract
Exosomes are closely associated with tumor development and are regarded as viable biomarkers for cancer. Here, a ratiometric fluorescence method was proposed for the one-step and label-free detection of plasma exosomes. A bicolor streptavidin magnetic beads were specifically created with an immobilized Cy5-labeled hairpin aptamer for CD63 (Cy5-Apt) on its surface to identify exosome, and a green color SYBR Green I (SGI) embedded in the stem of Cy5-Apt to respond to exosomes. After exosome capture, the Cy5-Apt could undergo a conformational shift and release the encapsulated SGI, allowing exosome measurement based on the fluorescence ratio of Cy5 and SGI. The enrichment, separation and detection of exosomes in proposed method could be completed in one step (30 min), which is a significant improvement over previous method. Furthermore, the use of ratiometric fluorescence and magnetic separation allows for exosome enrichment and interference elimination from complex matrices, improving accuracy and sensitivity. Particularly, the assay could detect exosomes in plasma and has potential to distinguish lung cancer patients from healthy volunteers with an area under the receiver operator characteristic curve of 0.85. Besides, the study provided an efficient method for analyzing the various divisions of exosomes by merely modifying the aptamer, which holds great promise for point-of-care applications.
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Affiliation(s)
- Yan Wu
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Zibo Gao
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China; Department of Epidemiology and Biostatistics, School of Public Health, Jilin University, Changchun, Jilin Province, 130000, China
| | - Yaru Chai
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Aiai Zhang
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Sitian He
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Xia Liu
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Huijie Yuan
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Longlong Tan
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China
| | - Lihua Ding
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China.
| | - Yongjun Wu
- College of Public Health, Zhengzhou University, Zhengzhou, 450001, China.
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García-Guzmán C, Morales-Narváez E, Coutino-Gonzalez E. Bioactive Luminescent Silver Clusters Confined in Zeolites Enable Quick and Wash-Free Biosensing. Angew Chem Int Ed Engl 2023; 62:e202307718. [PMID: 37782257 DOI: 10.1002/anie.202307718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 09/27/2023] [Accepted: 10/02/2023] [Indexed: 10/03/2023]
Abstract
The simultaneous capture and detection of biomolecules is crucial for revolutionizing bioanalytical platforms in terms of portability, response time and cost-efficiency. Herein, we demonstrate how the sensitivity to external stimuli and changes in the local electronic environment of silver clusters lead to an advantageous biosensing platform based on the fluorometric response of bioactive luminescent silver clusters (BioLuSiC) confined in faujasite X zeolites functionalized with antibodies. The photoluminescence response of BioLuSiC was enhanced upon immunocomplex formation, empowering a wash-free and quick biodetection system offering optimal results from 5 min. Proteins and pathogens (immunoglobulin G and Escherichia coli) were targeted to demonstrate the biosensing performance of BioLuSiC, and a human serum titration assay was also established. BioLuSiC will pave the way for innovative bioanalytical platforms, including real-time monitoring systems, point-of-care devices and bioimaging techniques.
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Affiliation(s)
- Cecilia García-Guzmán
- Centro de Investigaciones en Óptica, A. C., Loma del Bosque 115, Lomas del Campestre, León, Guanajuato, 37150, Mexico
| | - Eden Morales-Narváez
- Biophotonic Nanosensors Laboratory, Centro de Física Aplicada y Tecnología Avanzada (CFATA), Universidad Nacional Autónoma de México (UNAM), Querétaro, 76230, Mexico
| | - Eduardo Coutino-Gonzalez
- Sustainable Materials Unit, VITO, Flemish Institute for Technological Research, Boeretang 200, Mol, B-2400, Belgium
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Zhang Y, Yang C, He J, Li M, Yuan R, Xu W. Ratiometric Fluorescence Biosensing of Tandem Biemissive Ag Clusters Boosted by Confined Catalytic DNA Assembly. Anal Chem 2023; 95:17928-17936. [PMID: 37971735 DOI: 10.1021/acs.analchem.3c04388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
The reaction kinetics and yield of traditional DNA assembly with a low local concentration in homogeneous solution remain challenging. Exploring confined catalytic DNA assembly (CCDA) is intriguing to boost the reaction rate and efficacy for creating rapid and sensitive biosensing platforms. A rolling circle amplification (RCA) product containing multiple tandem repeats is a natural scaffold capable of guiding the periodic assembly of customized functional probes at precise sites. Here, we present a RCA-confined CCDA strategy to speed up amplifiable conversion for ratiometric fluorescent sensing of a sequence-specific inducer (I*) by using string green-/red-Ag clusters (sgAgCs and srAgCs) as two counterbalance emitters. Upon recognition of I*, CCDA events are operated by two toehold-mediated strand displacements and localized in repetitive units, thereby releasing I* for recycled signal amplification in the as-grown RCA concatemer. The local concentration of reactive species is increased to facilitate rapider dsDNA complex assembly and more efficient input-output conversion, on which the clustering template sequences of sgAgCs and srAgCs are blocked and opened, enabling srAgCs synthesis but opposite to sgAgCs. Thus, the fluorescence emission of srAgCs goes up, while sgAgCs go down. With the resultant ratio featuring inherent built-in correction, rapid, sensitive, and accurate quantification of I* at the picomolar level is achieved. Benefiting from efficient RCA confinement to enhance reaction kinetics and conversion yield, this CCDA-based strategy provides a new paradigm for developing simple and diverse biosensing methodologies.
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Affiliation(s)
- Yuqing Zhang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
| | - Chunli Yang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
| | - Jiayang He
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
| | - Mengdie Li
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
| | - Ruo Yuan
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
| | - Wenju Xu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China
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Fredrick D, Yourston L, Krasnoslobodtsev AV. Detection of cancer-associated miRNA using a fluorescence switch of AgNC@NA and guanine-rich overhang sequences. LUMINESCENCE 2023; 38:1385-1392. [PMID: 36843363 DOI: 10.1002/bio.4471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 02/03/2023] [Accepted: 02/18/2023] [Indexed: 02/28/2023]
Abstract
DNA-templated silver nanoclusters (AgNC@DNA) are a novel type of nanomaterial with advantageous optical properties. Only a few atoms in size, the fluorescence of nanoclusters can be tuned using DNA overhangs. In this study, we explored the properties of AgNCs manufactured on a short single-stranded (dC)12 when adjacent G-rich sequences (dGN , with N = 3-15) were added. The 'red' emission of AgNC@dC12 with λMAX = 660 nm dramatically changed upon the addition of a G-rich overhang with NG = 15. The pattern of the emission-excitation matrix (EEM) suggested the emergence of two new emissive states at λMAX = 575 nm and λMAX = 710 nm. The appearance of these peaks provides an effective way to design biosensors capable of detecting specific nucleic acid sequences with low fluorescence backgrounds. We used this property to construct an NA-based switch that brings AgNC and the G overhang near one another, turning 'ON' the new fluorescence peaks only when a specific miRNA sequence is present. Next, we tested this detection switch on miR-371, which is overexpressed in prostate cancer. The results presented provide evidence that this novel fluorescent switch is both sensitive and specific with a limit of detection close to 22 picomoles of the target miR-371 molecule.
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Affiliation(s)
- Dylan Fredrick
- Department of Physics, University of Nebraska Omaha, 6001 Dodge Street, Omaha, Nebraska, USA
| | - Liam Yourston
- Department of Physics, University of Nebraska Omaha, 6001 Dodge Street, Omaha, Nebraska, USA
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Lin Y, Li Y, Chang H, Ye S, Ye Y, Yang L, Liao L, Dai H, Wei Z, Deng Y, Zhang J, Zheng C. Rapid Testing of Δ9-Tetrahydrocannabinol and Its Metabolite On-Site Using a Label-Free Ratiometric Fluorescence Assay on a Smartphone. Anal Chem 2023; 95:7363-7371. [PMID: 37127404 DOI: 10.1021/acs.analchem.3c00666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Excessive consumption of Δ9-tetrahydrocannabinol (THC) severely endangers human health and has raised public safety concerns. However, its quantification by readily rapid tools with simplicity and low cost is still challenging. Herein, we found that a G-rich THC aptamer (THC1.2) can tightly bind to thioflavin T (ThT) with strong fluorescence, which would be specifically quenched in the presence of THC. Based on that, a label-free ratiometric fluorescent sensor for the sensing of THC and its metabolite (THC-COOH) based on THC1.2/ThT as a color emitter and red CdTe quantum dots as reference fluorescence was constructed. Notably, a transition of the fluorescent color of the ratiometric probe from green to red can be instantly observed upon the increased concentration of THC and THC-COOH. Furthermore, a portable smartphone-based fluorescence device integrated with a self-programmed Python program was fabricated and used to accomplish on-site monitoring of THC and THC-COOH within 5 min. Under optimized conditions, this ratiometric fluorescent sensor allowed for an instant response toward THC and its metabolite with considerable limits of detection of 97 and 254 nM, respectively. The established sensor has been successfully applied to urine and saliva samples and exhibited satisfactory recoveries (88-116%). This ratiometric fluorescent sensor can be used for the simultaneous detection of THC and THC-COOH with the advantages of rapidness, low cost, ease of operation, and portability, providing a promising strategy for on-site detection and facilitating law enforcement regulation and roadside control of THC.
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Affiliation(s)
- Yao Lin
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yuyang Li
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Hongqi Chang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Simin Ye
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yi Ye
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Lin Yang
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Linchuan Liao
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Hao Dai
- West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Zeliang Wei
- Core Facilities of West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yurong Deng
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Jinyi Zhang
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Chengbin Zheng
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
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Zhang Y, Yang C, He J, Zuo S, Shang X, Gao J, Yuan R, Xu W. Target DNA-Activating Proximity-Localized Catalytic Hairpin Assembly Enables Forming Split-DNA Ag Nanoclusters for Robust and Sensitive Fluorescence Biosensing. Anal Chem 2022; 94:14947-14955. [PMID: 36269062 DOI: 10.1021/acs.analchem.2c02733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Proximity-localized catalytic hairpin assembly (plCHA) is intriguing for rapid and sensitive assay of an HIV-specific DNA segment (T*). Using template-integrated green Ag nanoclusters (igAgNCs) as emitters, herein, we report the first design of a T*-activated plCHA circuit that is confined in a three-way-junction architecture (3WJA) for the fluorescence sensing of T*. To this end, the T*-recognizable complement is programmed in a stem-loop hairpin (H1), and two split template sequences of igAgNCs are separately overhung contiguous to the paired stems of H1 and another hairpin (H2). The hybridization among H1, H2, and two single-stranded linkers (L1 and L2) allows the stable construction of 3WJA. Upon presenting the input T*, the 3WJA-localized plCHA is operated through toehold-mediated strand displacements of H1 and H2 reactants, and T* is rationally displaced and repeatably recycled, analogous to a specific catalyst, inducing more hairpin assembly events. Resultantly, the hybridized products enable the collective combination of two splits in the parent scaffold for hosting igAgNCs, outputting T*-dependent fluorescence response. Because of 3WJA structural confinement, the spatial proximity of two reactive hairpins yielded high local concentrations to manipulate the plCHA operation, achieving rapider reaction kinetics via T*-catalyzed recycling than typical catalytic hairpin assembly (CHA). This simple assay strategy would open the arena to develop various plCHA-based circuits capable of modulating the fluorescence emission of igAgNCs for applicable biosensing and bioanalysis.
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Affiliation(s)
- Yuqing Zhang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Chunli Yang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Jiayang He
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Siyu Zuo
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Xin Shang
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Jiaxi Gao
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Ruo Yuan
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
| | - Wenju Xu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing400715, P. R. China
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