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Jain K, Pandey A, Wang H, Chung T, Nemati A, Kanchanawong P, Sheetz MP, Cai H, Changede R. TiO 2 Nano-Biopatterning Reveals Optimal Ligand Presentation for Cell-Matrix Adhesion Formation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309284. [PMID: 38340044 PMCID: PMC11126362 DOI: 10.1002/adma.202309284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 01/31/2024] [Indexed: 02/12/2024]
Abstract
Nanoscale organization of transmembrane receptors is critical for cellular functions, enabled by the nanoscale engineering of bioligand presentation. Previously, a spatial threshold of ≤60 nm for integrin binding ligands in cell-matrix adhesion is demonstrated using monoliganded gold nanoparticles. However, the ligand geometric arrangement is limited to hexagonal arrays of monoligands, while plasmonic quenching limits further investigation by fluorescence-based high-resolution imaging. Here, these limitations are overcome with dielectric TiO2 nanopatterns, eliminating fluorescence quenching, thus enabling super-resolution fluorescence microscopy on nanopatterns. By dual-color super-resolution imaging, high precision and consistency among nanopatterns, bioligands, and integrin nanoclusters are observed, validating the high quality and integrity of both nanopattern functionalization and passivation. By screening TiO2 nanodiscs with various diameters, an increase in fibroblast cell adhesion, spreading area, and Yes-associated protein (YAP) nuclear localization on 100 nm diameter compared with smaller diameters was observed. Focal adhesion kinase is identified as the regulatory signal. These findings explore the optimal ligand presentation when the minimal requirements are sufficiently fulfilled in the heterogenous extracellular matrix network of isolated binding regions with abundant ligands. Integration of high-fidelity nano-biopatterning with super-resolution imaging allows precise quantitative studies to address early signaling events in response to receptor clustering and their nanoscale organization.
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Affiliation(s)
- Kashish Jain
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
| | - Ashish Pandey
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Hao Wang
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Taerin Chung
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Arash Nemati
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
| | - Pakorn Kanchanawong
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- Department of Biomedical Engineering, National University of Singapore, Singapore, Singapore
| | - Michael P. Sheetz
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- Molecular Mechanomedicine Program, Biochemistry and Molecular Biology Department, University of Texas Medical Branch, Galveston, TX, USA
| | - Haogang Cai
- Tech4Health Institute and Department of Radiology, NYU Langone Health, New York, NY, USA
- Department of Biomedical Engineering, New York University, Brooklyn, NY, USA
| | - Rishita Changede
- Mechanobiology Institute, National University of Singapore, Singapore, Singapore
- TeOra Pte. Ltd, Singapore, Singapore
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Kim SK, Lee JU, Jeon MJ, Kim SK, Hwang SH, Hong ME, Sim SJ. Bio-conjugated nanoarchitectonics with dual-labeled nanoparticles for a colorimetric and fluorescent dual-mode serological lateral flow immunoassay sensor in detection of SARS-CoV-2 in clinical samples. RSC Adv 2023; 13:27225-27232. [PMID: 37701275 PMCID: PMC10494995 DOI: 10.1039/d3ra04373h] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 09/05/2023] [Indexed: 09/14/2023] Open
Abstract
Serological detection of antibodies for diagnosing infectious diseases has advantages in facile diagnostic procedures, thereby contributing to controlling the spread of the pathogen, such as in the recent SARS-CoV-2 pandemic. Lateral flow immunoassay (LFIA) is a representative serological antibody detection method suitable for on-site applications but suffers from low clinical accuracy. To achieve a simple and rapid serological screening as well as the sensitive quantification of antibodies against SARS-CoV-2, a colorimetric and fluorescent dual-mode serological LFIA sensor incorporating metal-enhanced fluorescence (MEF) was developed. For the strong fluorescence signal amplification, fluorophore Cy3 was immobilized onto gold nanoparticles (AuNPs) with size-controllable spacer polyethyleneglycol (PEG) to maintain an optimal distance to induce MEF. The sensor detects the target IgG with a concentration as low as 1 ng mL-1 within 8 minutes. The employment of the MEF into the dual-mode serological LFIA sensor shows a 1000-fold sensitivity improvement compared with that of colorimetric LFIAs. The proposed serological LFIA sensor was tested with 73 clinical samples, showing sensitivity, specificity, and accuracy of 95%, 100%, and 97%, respectively. In conclusion, the dual-mode serological LFIA has great potential for application in diagnosis and an epidemiological survey of vaccine efficacy and immunity status of individuals.
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Affiliation(s)
- Sang Ki Kim
- Department of Chemical and Biological Engineering, Korea University 145, Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea
| | - Jong Uk Lee
- Department of Chemical Engineering, Sunchon National University 225 Jungang-ro Suncheon Jeollanam-do 57922 Republic of Korea
| | - Myeong Jin Jeon
- Department of Chemical and Biological Engineering, Korea University 145, Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea
| | - Soo-Kyung Kim
- Department of Laboratory Medicine, Ewha Womans University Mokdong Hospital Seoul 07985 Republic of Korea
| | - Sang-Hyun Hwang
- Department of Laboratory Medicine, Asan Medical Center, University of Ulsan College of Medicine Seoul 05505 Republic of Korea
| | - Min Eui Hong
- Business Development, Kyung Nam Pharm.Co.,Ltd 702 Eonju-ro Gangnam-gu Seoul 06061 Republic of Korea
| | - Sang Jun Sim
- Department of Chemical and Biological Engineering, Korea University 145, Anam-ro, Seongbuk-gu Seoul 02841 Republic of Korea
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Emerson NT, Yang H. Reproducibly Measuring Plasmon-Enhanced Fluorescence in Bulk Solution Across a 20-Fold Range of Optical Densities. Anal Chem 2021; 93:8045-8053. [PMID: 34038099 DOI: 10.1021/acs.analchem.1c01210] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
It is well-known that plasmonic nanoparticles can modify the spectroscopic properties of nearby optical probes, for example, enhanced emission of a fluorescent dye. Yet, the detection and quantification of this effect in bulk solution remain challenging even while size- and shape-controlled nanoparticles have become readily available. We investigated this problem and identified two main difficulties which we were able to overcome through systematic studies. For the detection of fluorescence emanating from optically dense nanoparticle solutions, we describe an analytical model that provides guidelines for experimentalists to maximize the fluorescence intensity by optimizing the concentration, light paths, and excitation-detection volume of the sample. For the quantification of enhancement, which critically hinges upon the comparison to an accurate reference sample, we exploit the tools of DNA nanotechnology to remove the fluorophore from plasmonic coupling on-demand, forming an in situ reference. Using a model system of fluorophore Cy3 and 80 nm gold nanoparticles, we show that these strategies enable the quantitative measurement of plasmonic enhancement across a 20-fold range of optical densities. We anticipate that the presented experimental framework will allow for routine, quantitative measurements for the research and development of plasmon-enhanced phenomena.
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Affiliation(s)
- Nyssa T Emerson
- Department of Chemistry, Princeton University 225A Frick Laboratory, Princeton, New Jersey 08544-1023, United States
| | - Haw Yang
- Department of Chemistry, Princeton University 225A Frick Laboratory, Princeton, New Jersey 08544-1023, United States
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Gezgin SY, Kepceoğlu A, Gündoğdu Y, Zongo S, Zawadzka A, Kiliç HŞ, Sahraoui B. Effect of Ar Gas Pressure on LSPR Property of Au Nanoparticles: Comparison of Experimental and Theoretical Studies. NANOMATERIALS 2020; 10:nano10061071. [PMID: 32486386 PMCID: PMC7352769 DOI: 10.3390/nano10061071] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 01/08/2023]
Abstract
In this study, the thin films were produced by using pulsed laser deposition (PLD) technique from gold (Au) nanoparticles deposited on two kinds of substrates under different argon (Ar) gas pressure. Microscope glass slides and silicon (100) wafers were used as amorphous and crystal substrates. The films were deposited under 2 × 10−3 mbar, 1 × 10−2 mbar, 2 × 10−2 mbar argon (Ar) ambient gas pressure. Effect of the background gas pressure on the plasma plume of the ablated Au nanoparticles was investigated in details. Morphology of Au nanoparticle thin films was investigated by means of atomic force microscopy (AFM) technique. Absorption spectra of Au nanoparticles were examined by using UV-Vis spectrometry. Extinction spectra of Au nanoparticles were calculated by using metallic nano particles boundary element method (MNPBEM) simulation programme. Both experimental spectra and simulation data for Au nanoparticles were obtained and compared in this work. It was concluded that they are also in good agreement with literature data. The measurements and the simulation results showed that localized surface plasmon resonance (LSPR) peaks for Au nanoparticles were located in the near infrared region (NIR) because of the larger size of the disk-like shape of Au nanoparticles, and the near-field coupling between Au nanoparticles. It was demonstrated that as the ambient gas (Ar) pressure was increased, the size and the density of Au nanoparticles on the substrate were decreased and the LSPR peak shifts toward the short wavelength region in the spectrum. This shift has been explained by the changes in the morphology of produced thin films.
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Affiliation(s)
- Serap Yiğit Gezgin
- Department of Physics, Faculty of Science, University of Selcuk, Selcuklu 42031, Konya, Turkey; (S.Y.G.); (A.K.)
| | - Abdullah Kepceoğlu
- Department of Physics, Faculty of Science, University of Selcuk, Selcuklu 42031, Konya, Turkey; (S.Y.G.); (A.K.)
| | - Yasemin Gündoğdu
- Department of Electric and Energy, Kadınhanı Faik İçil Vocational High School, University of Selçuk, Selçuklu 42031, Konya, Turkey;
| | - Sidiki Zongo
- Department of Physics, LPCE, Joseph KI-ZERBO University, 03 P.O. Box 7021, Ouagadougou 03, Burkina Faso;
| | - Anna Zawadzka
- Department of Applied Physics, Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland;
| | - Hamdi Şükür Kiliç
- Department of Physics, Faculty of Science, University of Selcuk, Selcuklu 42031, Konya, Turkey; (S.Y.G.); (A.K.)
- Directorate of High Technology Research and Application Center, University of Selcuk, Selcuklu 2031, Konya, Turkey
- Correspondence: (H.Ş.K.); (B.S.)
| | - Bouchta Sahraoui
- University of Angers, MOLTECH Anjou, CNRS UMR 6200, 2 Bd Lavoisier, F-49045 Angers, France
- Correspondence: (H.Ş.K.); (B.S.)
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Ang Y, Woon W, Yung LYL. The role of spacer sequence in modulating turn-on fluorescence of DNA-templated silver nanoclusters. Nucleic Acids Res 2018; 46:6974-6982. [PMID: 29982768 PMCID: PMC6101541 DOI: 10.1093/nar/gky521] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Revised: 05/18/2018] [Accepted: 06/09/2018] [Indexed: 12/18/2022] Open
Abstract
Guanine activation of fluorescence in DNA templated silver nanoclusters (AgNCs) is an interesting physical phenomenon which has yet to be fully understood to date. While the individual role of cytosine and guanine has been established, there is still a knowledge gap on how the AgNC-DNA system switches from dark to bright state. Here, we present evidence on the universal role of the DNA spacer sequence in physically separating two Ag+-binding cytosine sites to maintain the dark state while holding them together for structural re-organization by the guanine-rich strand to activate the bright state. The extent of turn-on signal could be modulated by adjusting the spacer length and composition. The ATATA spacer sequence was found to have negligible dark state fluorescence and a turn-on effect of 2440-fold, which was almost five times of the highest factor reported to date.
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Affiliation(s)
- Yan Shan Ang
- Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585
| | - Wei Wen Elvin Woon
- Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585
| | - Lin-Yue Lanry Yung
- Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585
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