1
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Huang LD, Gou XY, Yang MJ, Li MJ, Chen SN, Yan J, Liu XX, Sun AH. Peptidoglycan biosynthesis-associated enzymatic kinetic characteristics and β-lactam antibiotic inhibitory effects of different Streptococcus pneumoniae penicillin-binding proteins. Int J Biol Macromol 2024; 254:127784. [PMID: 37949278 DOI: 10.1016/j.ijbiomac.2023.127784] [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: 05/24/2023] [Revised: 09/15/2023] [Accepted: 10/28/2023] [Indexed: 11/12/2023]
Abstract
Penicillin-binding proteins (PBPs) include transpeptidases, carboxypeptidases, and endopeptidases for biosynthesis of peptidoglycans in the cell wall to maintain bacterial morphology and survival in the environment. Streptococcus pneumoniae expresses six PBPs, but their enzymatic kinetic characteristics and inhibitory effects on different β-lactam antibiotics remain poorly understood. In this study, all the six recombinant PBPs of S. pneumoniae displayed transpeptidase activity with different substrate affinities (Km = 1.56-9.11 mM) in a concentration-dependent manner, and rPBP3 showed a greater catalytic efficiency (Kcat = 2.38 s-1) than the other rPBPs (Kcat = 3.20-7.49 × 10-2 s-1). However, only rPBP3 was identified as a carboxypeptidase (Km = 8.57 mM and Kcat = 2.57 s-1). None of the rPBPs exhibited endopeptidase activity. Penicillin and cefotaxime inhibited the transpeptidase and carboxypeptidase activity of all the rPBPs but imipenem did not inhibited the enzymatic activities of rPBP3. Except for the lack of binding of imipenem to rPBP3, penicillin, cefotaxime, and imipenem bound to all the other rPBPs (KD = 3.71-9.35 × 10-4 M). Sublethal concentrations of penicillin, cefotaxime, and imipenem induced a decrease of pneumococcal pbps-mRNA levels (p < 0.05). These results indicated that all six PBPs of S. pneumoniae are transpeptidases, while only PBP3 is a carboxypeptidase. Imipenem has no inhibitory effect on pneumococcal PBP3. The pneumococcal genes for encoding endopeptidases remain to be determined.
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Affiliation(s)
- Li-Dan Huang
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China; Yiwu Central Blood Station, Yiwu, Zhejiang 322000, PR China
| | - Xiao-Yu Gou
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China
| | - Mei-Juan Yang
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China; The First Hospital of Putian City, Putian, Fujian 351100, PR China
| | - Meng-Jie Li
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China
| | - Sui-Ning Chen
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China
| | - Jie Yan
- Zhejiang University School of Medicine, Hangzhou, Zhejiang 310058, PR China
| | - Xiao-Xiang Liu
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China.
| | - Ai-Hua Sun
- School of Basic Medical Sciences and Forensic Medicine, Hangzhou Medical College, Hangzhou, Zhejiang 310053, PR China.
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2
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Soha SA, Santhireswaran A, Huq S, Casimir-Powell J, Jenkins N, Hodgson GK, Sugiyama M, Antonescu CN, Impellizzeri S, Botelho RJ. Improved imaging and preservation of lysosome dynamics using silver nanoparticle-enhanced fluorescence. Mol Biol Cell 2023; 34:ar96. [PMID: 37405751 PMCID: PMC10551705 DOI: 10.1091/mbc.e22-06-0200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 06/26/2023] [Accepted: 06/27/2023] [Indexed: 07/06/2023] Open
Abstract
The dynamics of living cells can be studied by live-cell fluorescence microscopy. However, this requires the use of excessive light energy to obtain good signal-to-noise ratio, which can then photobleach fluorochromes, and more worrisomely, lead to phototoxicity. Upon light excitation, noble metal nanoparticles such as silver nanoparticles (AgNPs) generate plasmons, which can then amplify excitation in direct proximity of the nanoparticle's surface and couple to the oscillating dipole of nearby radiating fluorophores, modifying their rate of emission and thus, enhancing their fluorescence. Here, we show that AgNPs fed to cells to accumulate within lysosomes enhanced the fluorescence of lysosome-targeted Alexa488-conjugated dextran, BODIPY-cholesterol, and DQ-BSA. Moreover, AgNP increased the fluorescence of GFP fused to the cytosolic tail of LAMP1, showing that metal enhanced fluorescence can occur across the lysosomal membrane. The inclusion of AgNPs in lysosomes did not disturb lysosomal properties such as lysosomal pH, degradative capacity, autophagy and autophagic flux, and membrane integrity, though AgNP seemed to increase basal lysosome tubulation. Importantly, by using AgNP, we could track lysosome motility with reduced laser power without damaging and altering lysosome dynamics. Overall, AgNP-enhanced fluorescence may be a useful tool to study the dynamics of the endo-lysosomal pathway while minimizing phototoxicity.
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Affiliation(s)
- Sumaiya A. Soha
- Molecular Science Graduate Program, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Araniy Santhireswaran
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Saaimatul Huq
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Jayde Casimir-Powell
- Molecular Science Graduate Program, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Nicala Jenkins
- Molecular Science Graduate Program, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Gregory K. Hodgson
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Michael Sugiyama
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Costin N. Antonescu
- Molecular Science Graduate Program, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Stefania Impellizzeri
- Molecular Science Graduate Program, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
| | - Roberto J. Botelho
- Molecular Science Graduate Program, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
- Department of Chemistry and Biology, Toronto Metropolitan University, Toronto, Ontario, Canada, M5B 2K3
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3
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Zhang P, Zhou X, Jiang J, Kolay J, Wang R, Ma G, Wan Z, Wang S. In Situ Analysis of Membrane-Protein Binding Kinetics and Cell-Surface Adhesion Using Plasmonic Scattering Microscopy. Angew Chem Int Ed Engl 2022; 61:e202209469. [PMID: 35922374 PMCID: PMC9561081 DOI: 10.1002/anie.202209469] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Indexed: 11/09/2022]
Abstract
Surface plasmon resonance microscopy (SPRM) is an excellent platform for in situ studying cell-substrate interactions. However, SPRM suffers from poor spatial resolution and small field of view. Herein, we demonstrate plasmonic scattering microscopy (PSM) by adding a dry objective on a popular prism-coupled surface plasmon resonance (SPR) system. PSM not only retains SPRM's high sensitivity and real-time analysis capability, but also provides ≈7 times higher spatial resolution and ≈70 times larger field of view than the typical SPRM, thus providing more details about membrane protein response to ligand binding on over 100 cells simultaneously. In addition, PSM allows quantifying the target movements in the axial direction with a high spatial resolution, thus allowing mapping adhesion spring constants for quantitatively describing the mechanical properties of the cell-substrate contacts. This work may offer a powerful and cost-effective strategy for upgrading current SPR products.
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Affiliation(s)
- Pengfei Zhang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
| | - Xinyu Zhou
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85287, USA
| | - Jiapei Jiang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85287, USA
| | - Jayeeta Kolay
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
| | - Rui Wang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
| | - Guangzhong Ma
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
| | - Zijian Wan
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
- School of Electrical, Energy and Computer Engineering, Arizona State University, Tempe, AZ 85287, USA
| | - Shaopeng Wang
- Biodesign Center for Bioelectronics and Biosensors, Arizona State University, Tempe, AZ 85287, USA
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, AZ 85287, USA
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4
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Zhang P, Zhou X, Jiang J, Kolay J, Wang R, Ma G, Wan Z, Wang S. In Situ Analysis of Membrane‐Protein Binding Kinetics and Cell–Surface Adhesion Using Plasmonic Scattering Microscopy. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pengfei Zhang
- Arizona State University Biodesign Center for Bioelectronics and Biosensors 1001 S. McAllister Ave. 85287 Tempe UNITED STATES
| | - Xinyu Zhou
- Arizona State University Biodesign Institute Biodesign Center for Bioelectronics and Biosensors UNITED STATES
| | - Jiapei Jiang
- Arizona State University Biodesign Institute Biodesign Center for Bioelectronics and Biosensors UNITED STATES
| | - Jayeeta Kolay
- Arizona State University Biodesign Institute Biodesign Center for Bioelectronics and Biosensors UNITED STATES
| | - Rui Wang
- Arizona State University Biodesign Institute Biodesign Center for Bioelectronics and Biosensors UNITED STATES
| | - Guangzhong Ma
- Arizona State University Biodesign Institute Biodesign Center for Bioelectronics and Biosensors UNITED STATES
| | - Zijian Wan
- Arizona State University Biodesign Institute Biodesign Center for Bioelectronics and Biosensors UNITED STATES
| | - Shaopeng Wang
- Arizona State University Biodesign Institute Center for Bioelectronics and Biosensors 1001 S McAllister AvenuePO BOX 875801 85248 Tempe UNITED STATES
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5
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Lai JJ, Chau ZL, Chen S, Hill JJ, Korpany KV, Liang N, Lin L, Lin Y, Liu JK, Liu Y, Lunde R, Shen W. Exosome Processing and Characterization Approaches for Research and Technology Development. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2103222. [PMID: 35332686 PMCID: PMC9130923 DOI: 10.1002/advs.202103222] [Citation(s) in RCA: 127] [Impact Index Per Article: 63.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 01/28/2022] [Indexed: 05/05/2023]
Abstract
Exosomes are extracellular vesicles that share components of their parent cells and are attractive in biotechnology and biomedical research as potential disease biomarkers as well as therapeutic agents. Crucial to realizing this potential is the ability to manufacture high-quality exosomes; however, unlike biologics such as proteins, exosomes lack standardized Good Manufacturing Practices for their processing and characterization. Furthermore, there is a lack of well-characterized reference exosome materials to aid in selection of methods for exosome isolation, purification, and analysis. This review informs exosome research and technology development by comparing exosome processing and characterization methods and recommending exosome workflows. This review also provides a detailed introduction to exosomes, including their physical and chemical properties, roles in normal biological processes and in disease progression, and summarizes some of the on-going clinical trials.
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Affiliation(s)
- James J. Lai
- Department of BioengineeringUniversity of WashingtonSeattleWA98195USA
| | - Zoe L. Chau
- Department of BioengineeringUniversity of WashingtonSeattleWA98195USA
| | - Sheng‐You Chen
- Department of Mechanical EngineeringUniversity of WashingtonSeattleWA98195USA
| | - John J. Hill
- Department of BioengineeringUniversity of WashingtonSeattleWA98195USA
| | | | - Nai‐Wen Liang
- Department of Materials Science and EngineeringNational Tsing Hua UniversityHsinchu30013Taiwan
| | - Li‐Han Lin
- Department of Mechanical EngineeringNational Taiwan UniversityTaipei City10617Taiwan
| | - Yi‐Hsuan Lin
- Department of Engineering and System ScienceNational Tsing Hua UniversityHsinchu30013Taiwan
| | - Joanne K. Liu
- Department of BioengineeringUniversity of WashingtonSeattleWA98195USA
| | - Yu‐Chung Liu
- Department of Materials Science and EngineeringNational Tsing Hua UniversityHsinchu30013Taiwan
| | - Ruby Lunde
- Department of BioengineeringUniversity of WashingtonSeattleWA98195USA
| | - Wei‐Ting Shen
- Department of Biomedical Engineering and Environmental SciencesNational Tsing Hua UniversityHsinchu30013Taiwan
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6
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Oldak L, Lukaszewski Z, Gorodkiewicz E. Studies of interactions between fibronectin and a specific antibody against fibronectin using SPRi and QCM. J Pharm Biomed Anal 2022; 212:114640. [DOI: 10.1016/j.jpba.2022.114640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 01/25/2022] [Accepted: 01/30/2022] [Indexed: 10/19/2022]
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7
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A review of optical methods for ultrasensitive detection and characterization of nanoparticles in liquid media with a focus on the wide field surface plasmon microscopy. Anal Chim Acta 2022; 1204:339633. [DOI: 10.1016/j.aca.2022.339633] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 12/27/2022]
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8
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Deep learning-based single-shot phase retrieval algorithm for surface plasmon resonance microscope based refractive index sensing application. Sci Rep 2021; 11:16289. [PMID: 34381103 PMCID: PMC8357982 DOI: 10.1038/s41598-021-95593-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 07/28/2021] [Indexed: 11/08/2022] Open
Abstract
A deep learning algorithm for single-shot phase retrieval under a conventional microscope is proposed and investigated. The algorithm has been developed using the context aggregation network architecture; it requires a single input grayscale image to predict an output phase profile through deep learning-based pattern recognition. Surface plasmon resonance imaging has been employed as an example to demonstrate the capability of the deep learning-based method. The phase profiles of the surface plasmon resonance phenomena have been very well established and cover ranges of phase transitions from 0 to 2π rad. We demonstrate that deep learning can be developed and trained using simulated data. Experimental validation and a theoretical framework to characterize and quantify the performance of the deep learning-based phase retrieval method are reported. The proposed deep learning-based phase retrieval performance was verified through the shot noise model and Monte Carlo simulations. Refractive index sensing performance comparing the proposed deep learning algorithm and conventional surface plasmon resonance measurements are also discussed. Although the proposed phase retrieval-based algorithm cannot achieve a typical detection limit of 10-7 to 10-8 RIU for phase measurement in surface plasmon interferometer, the proposed artificial-intelligence-based approach can provide at least three times lower detection limit of 4.67 × 10-6 RIU compared to conventional intensity measurement methods of 1.73 × 10-5 RIU for the optical energy of 2500 pJ with no need for sophisticated optical interferometer instrumentation.
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9
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Wang X, Wang C, Sun X, Li X, Liu H, Sun X, Wang F, Lu X, Huang C. Locally excited surface plasmon resonance for refractive index sensing with high sensitivity and high resolution. OPTICS LETTERS 2021; 46:3625-3628. [PMID: 34329241 DOI: 10.1364/ol.432385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 06/27/2021] [Indexed: 06/13/2023]
Abstract
An angle-interrogated surface plasmon resonance (SPR) sensor based on a prism-coupled configuration has been extensively applied in biomedicine, environment monitoring, and food safety. Yet, the low sensitivity and low spatial resolution impede its further development. In this Letter, we investigated objective-coupled locally excited SPR for refractive index (RI) sensing with high sensitivity and high resolution. Through theoretical analysis, the SPR angle was retrieved from back focal plane imaging, which was highly correlated to the RI of the surrounding medium. Experimentally, a RI sensitivity of 77.41° refractive index unit (RIU)-1 was achieved with a detection range of 0.068 RIU when using glucose solutions for the demonstration. Furthermore, we acquired the spatial resolution of the configuration being 290 nm, and the RI measurement to a polydimethylsiloxane droplet with high spatial resolution was implemented. As a result, compared with the classical prism-coupled configuration, the locally excited SPR provides a method to achieve RI sensing with high sensitivity and high resolution.
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10
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Kwee E, Peterson A, Halter M, Elliott J. Practical application of microsphere samples for benchmarking a quantitative phase imaging system. Cytometry A 2020; 99:1022-1032. [PMID: 33305901 PMCID: PMC8195315 DOI: 10.1002/cyto.a.24291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 11/11/2020] [Accepted: 12/01/2020] [Indexed: 01/12/2023]
Abstract
Quantitative phase imaging (QPI) provides an approach for monitoring the dry mass of individual cells by measuring the optical pathlength of visible light as it passes through cells. A distinct advantage of QPI is that the measurements result in optical path length quantities that are, in principle, instrument independent. Reference materials that induce a well‐defined optical pathlength shift and are compatible with QPI imaging systems will be valuable in assuring the accuracy of such measurements on different instruments. In this study, we evaluate seven combinations of microspheres embedded in index refraction matching media as candidate reference materials for benchmarking the performance of a QPI system and as calibration standards for the optical pathlength measurement. Poly(methyl metharylate) microspheres and mineral oil were used to evaluate the range of illumination apertures, signal‐to‐noise ratios, and focus positions that allow an accurate quantitative optical pathlength measurement. The microsphere‐based reference material can be used to verify settings on an instrument that are suitable for obtaining an accurate pathlength measurement from biological cells. The microsphere/media reference material is applied to QPI‐based dry mass measurements of a population of HEK293 cells to benchmark and provide evidence that the QPI image data are accurate.
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Affiliation(s)
- Edward Kwee
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
| | - Alexander Peterson
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
| | - Michael Halter
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
| | - John Elliott
- Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
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11
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Wang D, Loo JFC, Chen J, Yam Y, Chen SC, He H, Kong SK, Ho HP. Recent Advances in Surface Plasmon Resonance Imaging Sensors. SENSORS 2019; 19:s19061266. [PMID: 30871157 PMCID: PMC6471112 DOI: 10.3390/s19061266] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 02/22/2019] [Accepted: 02/26/2019] [Indexed: 12/12/2022]
Abstract
The surface plasmon resonance (SPR) sensor is an important tool widely used for studying binding kinetics between biomolecular species. The SPR approach offers unique advantages in light of its real-time and label-free sensing capabilities. Until now, nearly all established SPR instrumentation schemes are based on single- or several-channel configurations. With the emergence of drug screening and investigation of biomolecular interactions on a massive scale these days for finding more effective treatments of diseases, there is a growing demand for the development of high-throughput 2-D SPR sensor arrays based on imaging. The so-called SPR imaging (SPRi) approach has been explored intensively in recent years. This review aims to provide an up-to-date and concise summary of recent advances in SPRi. The specific focuses are on practical instrumentation designs and their respective biosensing applications in relation to molecular sensing, healthcare testing, and environmental screening.
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Affiliation(s)
- Dongping Wang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China.
| | - Jacky Fong Chuen Loo
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, China.
- Biochemistry Programme, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
| | - Jiajie Chen
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, China.
| | - Yeung Yam
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China.
| | - Shih-Chi Chen
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China.
| | - Hao He
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Siu Kai Kong
- Biochemistry Programme, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.
| | - Ho Pui Ho
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong, China.
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12
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Jiang Y, Wang W. Point Spread Function of Objective-Based Surface Plasmon Resonance Microscopy. Anal Chem 2018; 90:9650-9656. [PMID: 29965733 DOI: 10.1021/acs.analchem.8b02800] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Objective-based surface plasmon resonance microscopy (SPRM) is a novel optical imaging technique that can map the spatial distribution of a local refractive index based on propagating surface plasmon polaritons (SPPs). Different from some other optical microscopy that shows a dot-like point spread function (PSF), a nanosized object appears as a wave-like pattern containing parabolic tails in SPRM. The geometrical complexity of the wave-like pattern hampered the quantitative interpretation of the PSF of SPRM. Previous studies have shown that two adjacent rings were obtained in the frequency domain by applying a two-dimensional Fourier transform to such patterns. In the present work, a ring-fitting method was developed to extract geometrical features out of the dual rings and to connect these features with several experimental parameters. It was found that the radius of ring equaled to the wavevector of SPPs. Its orientation revealed the propagation direction of SPPs. The coordinate distance of the center of ring gave the parallel component of the wavevector of the incident light, which was regulated by the incident angle. The ring-broadening factor reflected the propagation length of SPPs in a reciprocal relationship. Systematical and quantitative interpretations in the frequency domain not only advanced the basic understanding on the PSF of SPRM but also opened up the possibility to utilize these frequency-domain features for detection and sensing purposes in future.
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Affiliation(s)
- Yingyan Jiang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210093 , China
| | - Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210093 , China
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13
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Peterson AW, Halter M, Tona A, Plant AL, Elliott JT. Mass Measurements of Focal Adhesions in Single Cells Using High Resolution Surface Plasmon Resonance Microscopy. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2018; 10509:1050905. [PMID: 29755164 PMCID: PMC5947864 DOI: 10.1117/12.2290776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Surface plasmon resonance microscopy (SPRM) is a powerful label-free imaging technique with spatial resolution approaching the optical diffraction limit. The high sensitivity of SPRM to small changes in index of refraction at an interface allows imaging of dynamic protein structures within a cell. Visualization of subcellular features, such as focal adhesions (FAs), can be performed on live cells using a high numerical aperture objective lens with a digital light projector to precisely position the incident angle of the excitation light. Within the cell-substrate region of the SPRM image, punctate regions of high contrast are putatively identified as the cellular FAs. Optical parameter analysis is achieved by application of the Fresnel model to the SPRM data and resulting refractive index measurements are used to calculate protein density and mass. FAs are known to be regions of high protein density that reside at the cell-substratum interface. Comparing SPRM with fluorescence images of antibody stained for vinculin, a component in FAs, reveals similar measurements of FA size. In addition, a positive correlation between FA size and protein density is revealed by SPRM. Comparing SPRM images for two cell types reveals a distinct difference in the protein density and mass of their respective FAs. Application of SPRM to quantify mass can greatly aid monitoring basic processes that control FA mass and growth and contribute to accurate models that describe cell-extracellular interactions.
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14
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Liu C, Hu F, Yang W, Xu J, Chen Y. A critical review of advances in surface plasmon resonance imaging sensitivity. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.10.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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15
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Drescher DG, Selvakumar D, Drescher MJ. Analysis of Protein Interactions by Surface Plasmon Resonance. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2017; 110:1-30. [PMID: 29412994 DOI: 10.1016/bs.apcsb.2017.07.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Surface plasmon resonance is an optical technique that is utilized for detecting molecular interactions, such as interactions that occur between proteins or other classes of molecules. Binding of a mobile molecule (analyte) to a molecule immobilized on a thin metal film (ligand) changes the refractive index of the film. The angle of extinction of light that is completely reflected after polarized light impinges upon the film, is altered and monitored as a change in detector position for a dip in reflected intensity (the surface plasmon resonance phenomenon). Because the method strictly detects mass, there is no need to label the interacting components, thus eliminating possible changes of their molecular properties. In this chapter, we review essential SPR methodology and present applications to basic science and human disease.
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Affiliation(s)
- Dennis G Drescher
- Wayne State University School of Medicine, Detroit, MI, United States.
| | | | - Marian J Drescher
- Wayne State University School of Medicine, Detroit, MI, United States
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16
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Wang X, Li Z, Ly N, Zhou F. One-Step Ligand Immobilization and Single Sample Injection for Regeneration-Free Surface Plasmon Resonance Measurements of Biomolecular Interactions. Anal Chem 2017; 89:3261-3265. [PMID: 28225259 DOI: 10.1021/acs.analchem.7b00121] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Surface plasmon resonance (SPR) has been well established as a method of choice for label-free kinetic measurements of biomolecular interactions. The conventional approach involves multiple injections of an analyte of different concentrations into a fluidic channel covered with a fixed ligand density. Optimization of the experimental conditions and assessment of the data quality can be complicated by issues such as disruption of the ligand structure by the regeneration step and the limited availability of the sample solution. By sequentially closing fluidic channels on a five-channel SPR instrument, different densities of a ligand can be immobilized and determined in one step. With a subsequent injection of a single sample solution, SPR sensorgrams can be simultaneously collected to yield binding and dissociation rate constants (ka and kd) and dissociation constant (KD) between the ligand and analyte. For biomolecular interactions that obey the Langmuir isotherm, we show that the fidelity of the kinetic data can only be reliably confirmed when there exists a strong linear correlation between the SPR signals and the ligand densities. The use of a multichannel SPR instrument also obviates the regeneration step, allowing the binding kinetics between the green fluorescent protein and its antibody to be measured. In comparison to the conventional approach, the method simplifies the experimental procedure, reduces costs associated with sensor chips and biological samples, expedites kinetic measurements, and allows affinity constants to be determined more straightforwardly.
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Affiliation(s)
- Xiaoying Wang
- College of Chemistry and Chemical Engineering, Central South University , Changsha, Hunan, P. R. China , 410083.,Department of Chemistry and Biochemistry, California State University, Los Angeles , Los Angeles, California 90032, United States
| | - Zhiqiang Li
- College of Chemistry and Chemical Engineering, Central South University , Changsha, Hunan, P. R. China , 410083.,Department of Chemistry and Biochemistry, California State University, Los Angeles , Los Angeles, California 90032, United States
| | - Nguyen Ly
- Biosensing Instrument Inc. , Tempe, Arizona 85284, United States
| | - Feimeng Zhou
- Department of Chemistry and Biochemistry, California State University, Los Angeles , Los Angeles, California 90032, United States
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