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Chien FC, Lin CY, Abrigo G. Enhancing the blinking fluorescence of single-molecule localization imaging by using a surface-plasmon-polariton-enhanced substrate. Phys Chem Chem Phys 2018; 20:27245-27255. [PMID: 30182107 DOI: 10.1039/c8cp02942c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Super-resolution imaging based on single-molecule localization microscopy combined with the surface plasmon polariton (SPP)-enhanced fluorescence of spontaneously blinking fluorophores was demonstrated to visualize the nanoscale-level positioning information of cell-adhesion-associated proteins. Glass substrates with a deposited silver layer were utilized to induce a SPP-enhanced field on the silver surface and significantly strengthen the fluorescence signals of the fluorophores by more than 300%. The illumination power density for localization imaging at a spatial resolution of 25 ± 11 nm was 31.6 W cm-2. This low illumination power density will facilitate the reduction of phototoxicity of the biospecimens for single-molecule localization imaging. The proposed strategy provides a uniform distribution of the SPP-enhanced field on the silver surface, enabling visualization of the spatial distribution of labeled proteins without interference caused by the enhanced field distribution.
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Affiliation(s)
- Fan-Ching Chien
- Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan.
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2
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Schreiber B, Heil HS, Kamp M, Heinze KG. Live-cell fluorescence imaging with extreme background suppression by plasmonic nanocoatings. OPTICS EXPRESS 2018; 26:21301-21313. [PMID: 30119432 DOI: 10.1364/oe.26.021301] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 07/05/2018] [Indexed: 06/08/2023]
Abstract
Fluorescence microscopy allows specific and selective imaging of biological samples. Unfortunately, unspecific background due to auto-fluorescence, scattering, and non-ideal labeling efficiency often adversely affect imaging. Surface plasmon-coupled emission (SPCE) is known to selectively mediate fluorescence that spatially originates from regions close to the metal interface. However, SPCE combined with fluorescence imaging has not been widely successful so far, most likely due to its limited photon yield, which makes it tedious to identify the exact window of the application. As the strength of SPCE based imaging is its unique sectioning capabilities. We decided to identify its clear beneficial operational regime for biological settings by interrogating samples in the presence of ascending background levels. For fluorescent beads as well as live-cell imaging as examples, we show how to extend the imaging performance in extremely high photon background environments. In a common setup using plasmonic gold-coated coverslips using an objective-based total internal reflection fluorescence microscope (TIRF-M), we theoretically and experimentally characterize our fluoplasmonics (f-Pics) approach by providing general user guidance in choosing f-Pics over TIRF-M or classical wide-field (WF).
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3
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Söllradl T, Chabot K, Fröhlich U, Canva M, Charette PG, Grandbois M. Monitoring individual cell-signaling activity using combined metal-clad waveguide and surface-enhanced fluorescence imaging. Analyst 2018; 143:5559-5567. [DOI: 10.1039/c8an00911b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Validation of a combined metal-clad waveguide and surface enhanced fluorescence imaging platform for live cell imaging.
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Affiliation(s)
- Thomas Söllradl
- Laboratoire Nanotechnologies Nanosystèmes (LN2) – CNRS UMI-3463
- Université de Sherbrooke
- Canada
- Institut Interdisciplinaire d'Innovation Technologique (3IT)
- Université de Sherbrooke
| | - Kevin Chabot
- Laboratoire Nanotechnologies Nanosystèmes (LN2) – CNRS UMI-3463
- Université de Sherbrooke
- Canada
- Institut Interdisciplinaire d'Innovation Technologique (3IT)
- Université de Sherbrooke
| | - Ulrike Fröhlich
- Département de Pharmacologie et Physiologie
- Université de Sherbrooke
- Canada
| | - Michael Canva
- Laboratoire Nanotechnologies Nanosystèmes (LN2) – CNRS UMI-3463
- Université de Sherbrooke
- Canada
- Institut Interdisciplinaire d'Innovation Technologique (3IT)
- Université de Sherbrooke
| | - Paul G. Charette
- Laboratoire Nanotechnologies Nanosystèmes (LN2) – CNRS UMI-3463
- Université de Sherbrooke
- Canada
- Institut Interdisciplinaire d'Innovation Technologique (3IT)
- Université de Sherbrooke
| | - Michel Grandbois
- Laboratoire Nanotechnologies Nanosystèmes (LN2) – CNRS UMI-3463
- Université de Sherbrooke
- Canada
- Département de Pharmacologie et Physiologie
- Université de Sherbrooke
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4
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Kuroda C, Ohki Y, Fujimaki M. Optimization of a waveguide-mode sensing chip for an ultraviolet near-field illumination biosensor. OPTICS EXPRESS 2017; 25:26011-26019. [PMID: 29041263 DOI: 10.1364/oe.25.026011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 10/06/2017] [Indexed: 06/07/2023]
Abstract
A waveguide-mode sensor with a planar sensing chip, consisting of two waveguiding layers and a glass substrate, is a promising candidate for a near-field illumination biosensor. Aiming at using fluorescent labeling induced by ultraviolet light, we optimize the structure of a waveguide-mode sensing chip, based on the mechanism for enhancing ultraviolet near-field light revealed by numerical calculations. Candidates of optimal materials are also presented. The chip optimized as above should be able to enhance the intensity of ultraviolet near-field light 25 times as high as an Al surface plasmon resonance sensing chip.
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Liu Q, Cao SH, Cai WP, Liu XQ, Weng YH, Xie KX, Huo SX, Li YQ. Surface Plasmon Coupled Emission in Micrometer-Scale Cells: A Leap from Interface to Bulk Targets. J Phys Chem B 2015; 119:2921-7. [DOI: 10.1021/jp512031r] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qian Liu
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Shuo-Hui Cao
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Wei-Peng Cai
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Xiao-Qing Liu
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yu-Hua Weng
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Kai-Xin Xie
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Si-Xin Huo
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yao-Qun Li
- Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis & Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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7
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Plasmon based super resolution imaging for single molecular detection: Breaking the diffraction limit. Biomed Eng Lett 2014. [DOI: 10.1007/s13534-014-0154-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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8
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Identification of the molecular mechanisms in cellular processes that elicit a surface plasmon resonance (SPR) response using simultaneous surface plasmon-enhanced fluorescence (SPEF) microscopy. Biosens Bioelectron 2013; 50:125-31. [DOI: 10.1016/j.bios.2013.06.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 05/29/2013] [Accepted: 06/07/2013] [Indexed: 11/24/2022]
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9
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Shih CY, Yeh HC. Surface plasmon-enhanced lasing in dye-doped cholesteric liquid crystals. OPTICS EXPRESS 2012; 20:20698-20704. [PMID: 23037118 DOI: 10.1364/oe.20.020698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study shows the results of a photonic band-edge laser using dye-doped cholesteric liquid crystals (CLCs) combined with silver (Ag) nanoparticles. When the Ag nanoparticle surface plasmon resonance wavelength matched the excitation source wavelength, the large optical fields provided by surface plasmons increased the fluorescence of dye molecules by enhancing the molecular excitation rate, achieving a low lasing threshold and high pumping efficiency.
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Affiliation(s)
- Cheng-Yu Shih
- Graduate Institute of Electro-Optical Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung 811, Taiwan
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10
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Wang Y, Liu X, Halpern AR, Cho K, Corn RM, Potma EO. Wide-field, surface-sensitive four-wave mixing microscopy of nanostructures. APPLIED OPTICS 2012; 51:3305-12. [PMID: 22695564 DOI: 10.1364/ao.51.003305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We describe a wide-field four-wave mixing (FWM) microscope with imaging characteristics optimized for examining nanostructures. The microscope employs surface-plasmon polariton (SPP) excitation in a gold film to achieve surface-sensitive imaging conditions. The SPP surface fields boost the FWM efficiency by 2 orders of magnitude relative to the excitation efficiency of the evanescent fields at a bare glass surface. We demonstrate two excitation geometries that completely suppress the electronic FWM response of the metal film while allowing the far-field detection of FWM radiation from nanostructures at the interface. We obtained wide-field FWM images from individual carbon nanotubes and nanoclusters of neocyanine molecules at image acquisition times of 1 s, demonstrating the potential for background free, surface-enhanced FWM imaging of nanomaterials.
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Affiliation(s)
- Yong Wang
- Department of Chemistry, University of California, Irvine, Irvine, California 92697-2025, USA
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11
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Abstract
AbstractThe ability of metal surfaces and nanostructures to localize and enhance optical fields is the primary reason for their application in biosensing and imaging. Local field enhancement boosts the signal-to-noise ratio in measurements and provides the possibility of imaging with resolutions significantly better than the diffraction limit. In fluorescence imaging, local field enhancement leads to improved brightness of molecular emission and to higher detection sensitivity and better discrimination. We review the principles of plasmonic fluorescence enhancement and discuss applications ranging from biosensing to bioimaging.
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12
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Zhang H, Zhao M, Peng L. Nonlinear structured illumination microscopy by surface plasmon enhanced stimulated emission depletion. OPTICS EXPRESS 2011; 19:24783-24794. [PMID: 22109506 PMCID: PMC5802240 DOI: 10.1364/oe.19.024783] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 10/24/2011] [Accepted: 11/07/2011] [Indexed: 05/29/2023]
Abstract
Nonlinear structured illumination microscopy (SIM) in theory has unlimited resolution over a full field of view. However under a realistic signal-to-noise ratio and a limited photon budget, the performance of nonlinear SIM strongly depends on the behavior of the nonlinear effect. Saturated SIM (SSIM) is not ideal in biological applications due to its strong photobleaching. Stimulated emission depletion (STED) SIM will have high sensitivity, higher resolution and less photo toxicity than SSIM. However, the laser power necessary to support a strong full-field STED effect is not attainable with current laser technology. We experimentally proved that surface plasmon resonance enhances (SPR) near surface STED effect by a factor of 8, and therefore STED-SIM is feasible in the total internal reflection microscopy mode with SPR enhancement. Simulation analysis predicts that SPR enhanced 2D STED is strong enough for nonlinear SIM to achieve high-speed imaging at 30-nm resolution and single molecule sensitivity. The STED-SIM superresolution microscopy method would provide a solution for observing single molecule processes in vitro or on the basal membrane of live cells.
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13
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Kim K, Choi JW, Ma K, Lee R, Yoo KH, Yun CO, Kim D. Nanoisland-based random activation of fluorescence for visualizing endocytotic internalization of adenovirus. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:1293-1299. [PMID: 20517876 DOI: 10.1002/smll.201000058] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Kyujung Kim
- Department of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea
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Lin CY, Chiu KC, Chang CY, Chang SH, Guo TF, Chen SJ. Surface plasmon-enhanced and quenched two-photon excited fluorescence. OPTICS EXPRESS 2010; 18:12807-12817. [PMID: 20588409 DOI: 10.1364/oe.18.012807] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This study investigated theoretically and experimentally that two-photon excited fluorescence is enhanced and quenched via surface plasmons (SPs) excited by total internal reflection with a silver film. The fluorescence intensity is fundamentally affected by the local electromagnetic field enhancement and the quantum yield change according to the surrounding structure and materials. By utilizing the Fresnel equation and classical dipole radiation modeling, local electric field enhancement, fluorescence quantum yield, and fluorescence emission coupling yield via SPs were theoretically analyzed at different dielectric spacer thicknesses between the fluorescence dye and the metal film. The fluorescence lifetime was also decreased substantially via the quenching effect. A two-photon excited total internal reflection fluorescence (TIRF) microscopy with a time-correlated single photon counting device has been developed to measure the fluorescence lifetimes, photostabilities, and enhancements. The experimental results demonstrate that the fluorescence lifetimes and the trend of the enhancements are consistent with the theoretical analysis. The maximum fluorescence enhancement factor in the surface plasmon-total internal reflection fluorescence (SP-TIRF) configuration can be increased up to 30 fold with a suitable thickness SiO(2) spacer. Also, to compromise for the fluorescence enhancement and the fluorophore photostability, we find that the SP-TIRF configuration with a 10 nm SiO(2) spacer can provide an enhanced and less photobleached fluorescent signal via the assistance of enhanced local electromagnetic field and quenched fluorescence lifetime, respectively.
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Affiliation(s)
- Chun-Yu Lin
- Department of Engineering Science, National Cheng Kung University, Tainan 701, Taiwan
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15
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He RY, Lin CY, Su YD, Chiu KC, Chang NS, Wu HL, Chen SJ. Imaging live cell membranes via surface plasmon-enhanced fluorescence and phase microscopy. OPTICS EXPRESS 2010; 18:3649-3659. [PMID: 20389375 DOI: 10.1364/oe.18.003649] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper demonstrates the first combination for wide-field surface plasmon (SP) phase microscopy and SP-enhanced fluorescence microscopy to image living cells' contacts on the surface of a bio-substrate simultaneously. The phase microscopy with a phase-shift interferometry and common-path optical setup can provide high-sensitivity phase information in long-term stability. Simultaneously, the fluorescence microscopy with the enhancement of a local electromagnetic field can supply bright fluorescent images. The combined microscope imposes a high numerical aperture objective upon the excitation of surface plasmon through a silver film with a thickness of 30 nm. The developed SP microscope is successfully applied to the real-time bright observation of the transfected fluorescence of living cells localized near the cell membrane on the bio-substrate and the high-sensitivity phase image of the cell-substrate contacts at the same time.
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Affiliation(s)
- Ruei-Yu He
- Institute of Biomedical Engineering, National Cheng Kung University, Tainan 701, Taiwan
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16
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Hong Q, Sze CI, Lin SR, Lee MH, He RY, Schultz L, Chang JY, Chen SJ, Boackle RJ, Hsu LJ, Chang NS. Complement C1q activates tumor suppressor WWOX to induce apoptosis in prostate cancer cells. PLoS One 2009; 4:e5755. [PMID: 19484134 PMCID: PMC2685983 DOI: 10.1371/journal.pone.0005755] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2009] [Accepted: 05/05/2009] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Tissue exudates contain low levels of serum complement proteins, and their regulatory effects on prostate cancer progression are largely unknown. We examined specific serum complement components in coordinating the activation of tumor suppressors p53 and WWOX (also named FOR or WOX1) and kinases ERK, JNK1 and STAT3 in human prostate DU145 cells. METHODOLOGY/PRINCIPAL FINDINGS DU145 cells were cultured overnight in 1% normal human serum, or in human serum depleted of an indicated complement protein. Under complement C1q- or C6-free conditions, WOX1 and ERK were mainly present in the cytoplasm without phosphorylation, whereas phosphorylated JNK1 was greatly accumulated in the nuclei. Exogenous C1q rapidly restored the WOX1 activation (with Tyr33 phosphorylation) in less than 2 hr. Without serum complement C9, p53 became activated, and hyaluronan (HA) reversed the effect. Under C6-free conditions, HA induced activation of STAT3, an enhancer of metastasis. Notably, exogenous C1q significantly induced apoptosis of WOX1-overexpressing DU145 cells, but not vehicle-expressing cells. A dominant negative and Y33R mutant of WOX1 blocked the apoptotic effect. C1q did not enhance p53-mediated apoptosis. By total internal reflection fluorescence (TIRF) microscopy, it was determined that C1q destabilized adherence of WOX1-expressing DU145 cells by partial detaching and inducing formation of clustered microvilli for focal adhesion particularly in between cells. These cells then underwent shrinkage, membrane blebbing and death. Remarkably, as determined by immunostaining, benign prostatic hyperplasia and prostate cancer were shown to have a significantly reduced expression of tissue C1q, compared to age-matched normal prostate tissues. CONCLUSIONS/SIGNIFICANCE We conclude that complement C1q may induce apoptosis of prostate cancer cells by activating WOX1 and destabilizing cell adhesion. Downregulation of C1q enhances prostate hyperplasia and cancerous formation due to failure of WOX1 activation.
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Affiliation(s)
- Qunying Hong
- Guthrie Research Institute, Laboratory of Molecular Immunology, Sayre, Pennsylvania, United States of America
| | - Chun-I Sze
- Department of Pathology, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
- Department of Anatomy and Cell Biology, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
| | - Sing-Ru Lin
- Institute of Molecular Medicine, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
| | - Ming-Hui Lee
- Institute of Molecular Medicine, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
| | - Ruei-Yu He
- Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Lori Schultz
- Guthrie Research Institute, Laboratory of Molecular Immunology, Sayre, Pennsylvania, United States of America
| | - Jean-Yun Chang
- Institute of Molecular Medicine, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
| | - Shean-Jen Chen
- Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, Republic of China
| | - Robert J. Boackle
- Section of Oral Biology, Department of Stomatology, Medical University of South Carolina, Charleston, South Carolina, United States of America
| | - Li-Jin Hsu
- Department of Microbiology and Immunology, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
- Center for Gene Regulation and Signal Transduction Research, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
| | - Nan-Shan Chang
- Guthrie Research Institute, Laboratory of Molecular Immunology, Sayre, Pennsylvania, United States of America
- Institute of Molecular Medicine, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
- Center for Gene Regulation and Signal Transduction Research, National Cheng Kung University Medical College, Tainan, Taiwan, Republic of China
- Department of Neuroscience and Physiology, SUNY Upstate Medical University, Syracuse, New York, United States of America
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He RY, Su YD, Cho KC, Lin CY, Chang NS, Chang CH, Chen SJ. Surface plasmon-enhanced two-photon fluorescence microscopy for live cell membrane imaging. OPTICS EXPRESS 2009; 17:5987-5997. [PMID: 19365417 DOI: 10.1364/oe.17.005987] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A surface plasmon-enhanced two-photon total-internal-reflection fluorescence (TIRF) microscope has been developed to provide fluorescent images of living cell membranes. The proposed microscope with the help of surface plasmons (SPs) not only provides brighter fluorescent images based on the mechanism of local electromagnetic field enhancement, but also reduces photobleaching due to having a shorter fluorophore lifetime. In comparison with a one-photon TIRF, the two-photon TIRF can achieve higher signal-to-noise ratio cell membrane imaging due its smaller excitation volume and lower scattering. By combining the SP enhancement and two-photon excitation TIRF, the microscope has demonstrated it's capability for brighter and more contrasted fluorescence membrane images of living monkey kidney COS-7 fibroblasts transfected with an EYFP-MEM or EGFP-WOX1 construct.
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Affiliation(s)
- Ruei-Yu He
- Institute of Biomedical Engineering, National Cheng Kung University, Tainan 701, Taiwan
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Guo Y, Ye JY, Divin C, Thomas TP, Myc A, Bersano-Begey TF, Baker JR, Norris TB. Label-free biosensing using a photonic crystal structure in a total-internal-reflection geometry. PROCEEDINGS OF SPIE--THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 2009; 7188:71880B-71880B12. [PMID: 20700480 DOI: 10.1117/12.808369] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
A novel optical biosensor using a one-dimensional photonic crystal structure in a total-internal-reflection geometry (PC-TIR) is presented and investigated for label-free biosensing applications. This simple configuration forms a micro Fabry-Perot resonator in the top layer which provides a narrow optical resonance to enable label-free, highly sensitive measurements for the presence of analytes on the sensing surface or the refractive index change of the surrounding medium in the enhanced evanescent field; and at the same time it employs an open sensing surface for real-time biomolecular binding detection. The high sensitivity of the sensor was experimentally demonstrated by bulk solvent refractive index changes, ultrathin molecular films adsorbed on the sensing surface, and real-time analytes binding, measuring both the spectral shift of the photonic crystal resonance and the change of the intensity ratio in a differential reflectance measurement. Detection limits of 7x10(-8) RIU for bulk solvent refractive index, 6x10(-5) nm for molecular layer thickness and 24 fg/mm(2) for mass density were obtained, which represent a significant improvement relative to state-of-the-art surface-plasmon-resonance (SPR)-based systems. The PC-TIR sensor is thus seen to be a promising technology platform for high sensitivity and accurate biomolecular detection.
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Affiliation(s)
- Yunbo Guo
- Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, MI 48109-2099, USA
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Kim K, Kim DJ, Cho EJ, Suh JS, Huh YM, Kim D. Nanograting-based plasmon enhancement for total internal reflection fluorescence microscopy of live cells. NANOTECHNOLOGY 2009; 20:015202. [PMID: 19417244 DOI: 10.1088/0957-4484/20/1/015202] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We investigated evanescent field enhancement based on subwavelength nanogratings for improved sensitivity in total internal reflection microscopy of live cells. The field enhancement is associated with subwavelength-grating-coupled plasmon excitation. An optimum sample employed a silver grating on a silver film and an SF10 glass substrate. Field intensity was enhanced by approximately 90% when measured by fluorescent excitation of microbeads relative to that on a bare prism as a control, which is in good agreement with numerical results. The subwavelength-grating-mediated field enhancement was also applied to live cell imaging of quantum dots, which confirmed the sensitivity enhancement qualitatively.
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Affiliation(s)
- Kyujung Kim
- Program for Nanomedical Science and Technology, Yonsei University, Seoul 120-749, Korea
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Abstract
Imaging membrane dynamics is an important goal, motivated by the abundance of biochemical and biophysical events that are orchestrated at, or by, cellular membranes. The short length scales, fast timescales, and environmental requirements of membrane phenomena present challenges to imaging experiments. Several technical advances offer means to overcome these challenges, and we describe here three powerful techniques applicable to membrane imaging: total internal reflection fluorescence (TIRF) microscopy, fluorescence interference contrast (FLIC) microscopy, and fluorescence correlation spectroscopy (FCS). For each, we discuss the physics underpinning the approach, its practical implementation, and recent examples highlighting its achievements in exploring the membrane environment.
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Affiliation(s)
- Jay T Groves
- Department of Chemistry, University of California, Berkeley, CA 94720, USA.
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Tsai SW, Chen YY, Liaw JW. Compound Cellular Imaging of Laser Scanning Confocal Microscopy by Using Gold Nanoparticles and Dyes. SENSORS 2008; 8:2306-2316. [PMID: 27879823 PMCID: PMC3673419 DOI: 10.3390/s8042306] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Accepted: 03/21/2008] [Indexed: 11/18/2022]
Abstract
Combining the scattered light of gold nanoparticles (GNPs) and the fluorescence of dye molecules, a compound cellular imaging of laser scanning confocal microscopy (LSCM) is obtained. The human breast cancer cell line (MDA-MB-435S, BCRC 60429) is used for experiment. These cells are incubated with a glucose medium containing GNPs for 26 hours, and then are stained by Prodium Iodide (PI) for their nuclei. By using a single laser to illuminate these cells and adjusting the ranges of two bandpass filters for the detection, the scattered light from the GNPs and the fluorescence of PI can be induced simultaneously, but be detected separately without crosstalk. Furthermore, a compound cellular image can be obtained by merging the two images of the expressions of GNP and PI together. From the TEM images of these cells, it is observed that GNPs are aggregated in the vesicles of the cytoplasm due to the cell's endocytosis. The aggregation of GNPs makes the surface plasmon resonance band of GNPs broadened, so that strong scattered light from GNPs can be generated by the illumination of different-wavelength lasers (458, 488, 514, 561, and 633 nm).
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Affiliation(s)
- Shiao-Wen Tsai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University259 Wen-Hwa 1 Rd., Kwei-Shan, Tao-Yuan, 333, Taiwan; E-mail:
| | - Yi-Yun Chen
- Institute of Biochemical and Biomedical Engineering, Chang Gung University259 Wen-Hwa 1 Rd., Kwei-Shan, Tao-Yuan, 333, Taiwan; E-mail:
| | - Jiunn-Woei Liaw
- Department of Mechanical Engineering, Chang Gung University, 259 Wen-Hwa 1 Rd., Kwei-Shan, Tao-Yuan, 333, Taiwan; E-mail:
- Author to whom correspondence should be addressed; E-mail:
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