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Franssen WMJ, Vergeldt FJ, Bader AN, van Amerongen H, Terenzi C. Full-Harmonics Phasor Analysis: Unravelling Multiexponential Trends in Magnetic Resonance Imaging Data. J Phys Chem Lett 2020; 11:9152-9158. [PMID: 33053305 PMCID: PMC7649845 DOI: 10.1021/acs.jpclett.0c02319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Phasor analysis is a robust, nonfitting, method for the study of multiexponential decays in lifetime imaging data, routinely used in Fluorescence Lifetime Imaging Microscopy (FLIM) and only recently validated for Magnetic Resonance Imaging (MRI). In the established phasor approach, typically only the first Fourier harmonic is used to unravel time-domain exponential trends and their intercorrelations across image voxels. Here, we demonstrate the potential of full-harmonics (FH) phasor analysis by using all frequency-domain data points in simulations and quantitative MRI (qMRI) T2 measurements of phantoms with bulk liquids or liquid-filled porous particles and of a human brain. We show that FH analysis, while of limited advantage in FLIM due to the correlated nature of shot noise, in MRI outperforms single-harmonic phasor in unravelling multiple physical environments and partial-volume effects otherwise undiscernible. We foresee application of FH phasor to, e.g., big-data analysis in qMRI of biological or other multiphase systems, where multiparameter fitting is unfeasible.
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Affiliation(s)
- Wouter M. J. Franssen
- Laboratory
of Biophysics, Wageningen University &
Research, Wageningen 6708 WE, The Netherlands
| | - Frank J. Vergeldt
- Laboratory
of Biophysics, Wageningen University &
Research, Wageningen 6708 WE, The Netherlands
| | - Arjen N. Bader
- Laboratory
of Biophysics, Wageningen University &
Research, Wageningen 6708 WE, The Netherlands
- MicroSpectroscopy
Centre, Wageningen University & Research, Wageningen 6708 WE, The Netherlands
| | - Herbert van Amerongen
- Laboratory
of Biophysics, Wageningen University &
Research, Wageningen 6708 WE, The Netherlands
- MicroSpectroscopy
Centre, Wageningen University & Research, Wageningen 6708 WE, The Netherlands
| | - Camilla Terenzi
- Laboratory
of Biophysics, Wageningen University &
Research, Wageningen 6708 WE, The Netherlands
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2
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Martens KJA, Bader AN, Baas S, Rieger B, Hohlbein J. Phasor based single-molecule localization microscopy in 3D (pSMLM-3D): An algorithm for MHz localization rates using standard CPUs. J Chem Phys 2018; 148:123311. [DOI: 10.1063/1.5005899] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Koen J. A. Martens
- Laboratory of Biophysics, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Laboratory of Bionanotechnology, Wageningen University and Research, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands
| | - Arjen N. Bader
- Laboratory of Biophysics, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Microspectroscopy Research Facility, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Sander Baas
- Laboratory of Biophysics, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Bernd Rieger
- Faculty of Applied Sciences, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands
| | - Johannes Hohlbein
- Laboratory of Biophysics, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Microspectroscopy Research Facility, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
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3
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Ranjbar Choubeh R, Sonani RR, Madamwar D, Struik PC, Bader AN, Robert B, van Amerongen H. Picosecond excitation energy transfer of allophycocyanin studied in solution and in crystals. Photosynth Res 2018; 135:79-86. [PMID: 28755150 PMCID: PMC5783994 DOI: 10.1007/s11120-017-0417-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 06/29/2017] [Indexed: 06/01/2023]
Abstract
Cyanobacteria perform photosynthesis with the use of large light-harvesting antennae called phycobilisomes (PBSs). These hemispherical PBSs contain hundreds of open-chain tetrapyrrole chromophores bound to different peptides, providing an arrangement in which excitation energy is funnelled towards the PBS core from where it can be transferred to photosystem I and/or photosystem II. In the PBS core, many allophycocyanin (APC) trimers are present, red-light-absorbing phycobiliproteins that covalently bind phycocyanobilin (PCB) chromophores. APC trimers were amongst the first light-harvesting complexes to be crystallized. APC trimers have two spectrally different PCBs per monomer, a high- and a low-energy pigment. The crystal structure of the APC trimer reveals the close distance (~21 Å) between those two chromophores (the distance within one monomer is ~51 Å) and this explains the ultrafast (~1 ps) excitation energy transfer (EET) between them. Both chromophores adopt a somewhat different structure, which is held responsible for their spectral difference. Here we used spectrally resolved picosecond fluorescence to study EET in these APC trimers both in crystallized and in solubilized form. We found that not all closely spaced pigment couples consist of a low- and a high-energy pigment. In ~10% of the cases, a couple consists of two high-energy pigments. EET to a low-energy pigment, which can spectrally be resolved, occurs on a time scale of tens of picoseconds. This transfer turns out to be three times faster in the crystal than in the solution. The spectral characteristics and the time scale of this transfer component are similar to what have been observed in the whole cells of Synechocystis sp. PCC 6803, for which it was ascribed to EET from C-phycocyanin to APC. The present results thus demonstrate that part of this transfer should probably also be ascribed to EET within APC trimers.
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Affiliation(s)
- Reza Ranjbar Choubeh
- Laboratory of Biophysics, Wageningen University, Wageningen, The Netherlands
- BioSolar Cells, P.O. Box 98, 6700 Wageningen, The Netherlands
| | - Ravi R. Sonani
- Post-Graduate Department of Biosciences, UGC-Centre of Advanced Study, Sardar Patel University, Bakrol, Anand, Gujarat 388 315 India
- Commission of Atomic and Alternative Energy, Institute of Biology and Technology of Saclay, 91191 Gif-sur-Yvette, France
| | - Datta Madamwar
- Post-Graduate Department of Biosciences, UGC-Centre of Advanced Study, Sardar Patel University, Bakrol, Anand, Gujarat 388 315 India
| | - Paul C. Struik
- Centre for Crop Systems Analysis, Wageningen University, Wageningen, The Netherlands
| | - Arjen N. Bader
- Laboratory of Biophysics, Wageningen University, Wageningen, The Netherlands
- MicroSpectroscopy Centre, Wageningen University, Wageningen, The Netherlands
| | - Bruno Robert
- Commission of Atomic and Alternative Energy, Institute of Biology and Technology of Saclay, 91191 Gif-sur-Yvette, France
| | - Herbert van Amerongen
- Laboratory of Biophysics, Wageningen University, Wageningen, The Netherlands
- MicroSpectroscopy Centre, Wageningen University, Wageningen, The Netherlands
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Vergeldt FJ, Prusova A, Fereidouni F, Amerongen HV, Van As H, Scheenen TWJ, Bader AN. Multi-component quantitative magnetic resonance imaging by phasor representation. Sci Rep 2017; 7:861. [PMID: 28408740 PMCID: PMC5429833 DOI: 10.1038/s41598-017-00864-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 03/20/2017] [Indexed: 12/02/2022] Open
Abstract
Quantitative magnetic resonance imaging (qMRI) is a versatile, non-destructive and non-invasive tool in life, material, and medical sciences. When multiple components contribute to the signal in a single pixel, however, it is difficult to quantify their individual contributions and characteristic parameters. Here we introduce the concept of phasor representation to qMRI to disentangle the signals from multiple components in imaging data. Plotting the phasors allowed for decomposition, unmixing, segmentation and quantification of our in vivo data from a plant stem, a human and mouse brain and a human prostate. In human brain images, we could identify 3 main T2 components and 3 apparent diffusion coefficients; in human prostate 5 main contributing spectral shapes were distinguished. The presented phasor analysis is model-free, fast and accurate. Moreover, we also show that it works for undersampled data.
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Affiliation(s)
- Frank J Vergeldt
- Laboratory of Biophysics, Wageningen University & Research, Wageningen, The Netherlands.,Wageningen NMR Centre, Wageningen University & Research, Wageningen, The Netherlands
| | - Alena Prusova
- Laboratory of Biophysics, Wageningen University & Research, Wageningen, The Netherlands
| | - Farzad Fereidouni
- Department of Pathology and Laboratory Medicine, UC Davis Medical Center, Sacramento, CA, USA
| | - Herbert van Amerongen
- Laboratory of Biophysics, Wageningen University & Research, Wageningen, The Netherlands.,MicroSpectroscopy Centre, Wageningen University and Research, Wageningen, The Netherlands
| | - Henk Van As
- Laboratory of Biophysics, Wageningen University & Research, Wageningen, The Netherlands. .,Wageningen NMR Centre, Wageningen University & Research, Wageningen, The Netherlands.
| | - Tom W J Scheenen
- Department of Radiology and Nuclear Medicine, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Arjen N Bader
- Laboratory of Biophysics, Wageningen University & Research, Wageningen, The Netherlands. .,MicroSpectroscopy Centre, Wageningen University and Research, Wageningen, The Netherlands.
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5
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Iermak I, Vink J, Bader AN, Wientjes E, van Amerongen H. Visualizing heterogeneity of photosynthetic properties of plant leaves with two-photon fluorescence lifetime imaging microscopy. Biochim Biophys Acta 2016; 1857:1473-1478. [PMID: 27239747 DOI: 10.1016/j.bbabio.2016.05.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 05/09/2016] [Accepted: 05/21/2016] [Indexed: 01/09/2023]
Abstract
Two-photon fluorescence lifetime imaging microscopy (FLIM) was used to analyse the distribution and properties of Photosystem I (PSI) and Photosystem II (PSII) in palisade and spongy chloroplasts of leaves from the C3 plant Arabidopsis thaliana and the C4 plant Miscanthus x giganteus. This was achieved by separating the time-resolved fluorescence of PSI and PSII in the leaf. It is found that the PSII antenna size is larger on the abaxial side of A. thaliana leaves, presumably because chloroplasts in the spongy mesophyll are "shaded" by the palisade cells. The number of chlorophylls in PSI on the adaxial side of the A. thaliana leaf is slightly higher. The C4 plant M. x giganteus contains both mesophyll and bundle sheath cells, which have a different PSI/PSII ratio. It is shown that the time-resolved fluorescence of bundle sheath and mesophyll cells can be analysed separately. The relative number of chlorophylls, which belong to PSI (as compared to PSII) in the bundle sheath cells is at least 2.5 times higher than in mesophyll cells. FLIM is thus demonstrated to be a useful technique to study the PSI/PSII ratio and PSII antenna size in well-defined regions of plant leaves without having to isolate pigment-protein complexes.
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Affiliation(s)
- Ievgeniia Iermak
- Laboratory of Biophysics, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands; BioSolar Cells Project Office, P.O. Box 98, 6700 AB Wageningen, The Netherlands
| | - Jochem Vink
- Laboratory of Biophysics, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands
| | - Arjen N Bader
- Laboratory of Biophysics, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands; MicroSpectroscopy Centre, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands
| | - Emilie Wientjes
- Laboratory of Biophysics, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands
| | - Herbert van Amerongen
- Laboratory of Biophysics, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands; BioSolar Cells Project Office, P.O. Box 98, 6700 AB Wageningen, The Netherlands; MicroSpectroscopy Centre, Wageningen University, P.O. Box 8128, 6700 ET Wageningen, The Netherlands
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6
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Bader AN, Visser NV, van Amerongen H, Visser AJWG. Phasor approaches simplify the analysis of tryptophan fluorescence data in protein denaturation studies. Methods Appl Fluoresc 2014; 2:045001. [PMID: 29148477 DOI: 10.1088/2050-6120/2/4/045001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The intrinsic fluorescence of tryptophan is frequently used to investigate the structure of proteins. The analysis of tryptophan fluorescence data is challenging: fluorescence (anisotropy) decays typically have multiple lifetime (correlation time) components and fluorescence spectra are broad and exhibit only minor shifts. In this work, we show that phasor approaches can substantially simplify tryptophan fluorescence analysis. To demonstrate this, we re-analyse previously recorded datasets of the denaturant (guanidinium hydrochloride, GuHCl) induced unfolding of a single-tryptophan-containing variant of apoflavodoxin from Azotobacter vinelandii. For three methods-(1) time-resolved fluorescence, (2) time-resolved fluorescence anisotropy and (3) steady-state fluorescence spectroscopy-we show that the phasor analysis can readily identify the presence of a folding intermediate. Moreover, the fractional contributions of protein states at various stages of unfolding and the values of the free energy difference of the unfolding process [Formula: see text] are obtained. The outcomes are compared to the global analysis results published previously.
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Affiliation(s)
- Arjen N Bader
- Laboratories of Biophysics and Biochemistry, Microspectroscopy Centre, Wageningen University, PO Box 8128, 6700 ET Wageningen, The Netherlands
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7
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Fereidouni F, Bader AN, Colonna A, Gerritsen HC. Phasor analysis of multiphoton spectral images distinguishes autofluorescence components of in vivo human skin. J Biophotonics 2014; 7:589-96. [PMID: 23576407 DOI: 10.1002/jbio.201200244] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2012] [Revised: 02/27/2013] [Accepted: 03/16/2013] [Indexed: 05/25/2023]
Abstract
Skin contains many autofluorescent components that can be studied using spectral imaging. We employed a spectral phasor method to analyse two photon excited autofluorescence and second harmonic generation images of in vivo human skin. This method allows segmentation of images based on spectral features. Various structures in the skin could be distinguished, including Stratum Corneum, epidermal cells and dermis. The spectral phasor analysis allowed investigation of their fluorescence composition and identification of signals from NADH, keratin, FAD, melanin, collagen and elastin. Interestingly, two populations of epidermal cells could be distinguished with different melanin content.
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Affiliation(s)
- Farzad Fereidouni
- Utrecht University, Department of Molecular Biophysics, Utrecht, The Netherlands
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8
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Heukers R, Vermeulen JF, Fereidouni F, Bader AN, Voortman J, Roovers RC, Gerritsen HC, van Bergen En Henegouwen PMP. Endocytosis of EGFR requires its kinase activity and N-terminal transmembrane dimerization motif. J Cell Sci 2013; 126:4900-12. [PMID: 23943881 DOI: 10.1242/jcs.128611] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
EGFR signaling is attenuated by endocytosis and degradation of receptor-ligand complexes in lysosomes. Endocytosis of EGFR is known to be regulated by multiple post-translational modifications. The observation that prevention of these modifications does not block endocytosis completely, suggests the involvement of other mechanism(s). Recently, receptor clustering has been suggested to induce internalization of multiple types of membrane receptors. However, the mechanism of clustering-induced internalization remains unknown. We have used biparatopic antibody fragments from llama (VHHs) to induce EGFR clustering without stimulating tyrosine kinase activity. Using this approach, we have found an essential role for the N-terminal GG4-like dimerization motif in the transmembrane domain (TMD) for clustering-induced internalization. Moreover, conventional EGF-induced receptor internalization depends exclusively on this TMD dimerization and kinase activity. Mutations in this dimerization motif eventually lead to reduced EGFR degradation and sustained signaling. We propose a novel role for the TMD dimerization motif in the negative-feedback control of EGFR. The widely conserved nature of GG4-like dimerization motifs in transmembrane proteins suggests a general role for these motifs in clustering-induced internalization.
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Affiliation(s)
- Raimond Heukers
- Cell Biology, Department of Biology, Science Faculty, Utrecht University, 3584 CH Utrecht, The Netherlands
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9
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Fereidouni F, Bader AN, Gerritsen HC. Spectral phasor analysis allows rapid and reliable unmixing of fluorescence microscopy spectral images. Opt Express 2012; 20:12729-41. [PMID: 22714302 DOI: 10.1364/oe.20.012729] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A new global analysis algorithm to analyse (hyper-) spectral images is presented. It is based on the phasor representation that has been demonstrated to be very powerful for the analysis of lifetime imaging data. In spectral phasor analysis the fluorescence spectrum of each pixel in the image is Fourier transformed. Next, the real and imaginary components of the first harmonic of the transform are employed as X and Y coordinates in a scatter (spectral phasor) plot. Importantly, the spectral phasor representation allows for rapid (real time) semi-blind spectral unmixing of up to three components in the image. This is demonstrated on slides with fixed cells containing three fluorescent labels. In addition the method is used to analyse autofluorescence of cells in a fresh grass blade. It is shown that the spectral phasor approach is compatible with spectral imaging data recorded with a low number of spectral channels.
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Affiliation(s)
- Farzad Fereidouni
- Department of Molecular Biophysics, Debye Institute, Utrecht University, Utrecht, The Netherlands
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10
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Hofman EG, Bader AN, Gerritsen HC, van Bergen En Henegouwen PM. EGF induces rapid reorganization of plasma membrane microdomains. Commun Integr Biol 2011; 2:213-4. [PMID: 19641732 DOI: 10.4161/cib.2.3.7877] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2009] [Accepted: 01/15/2009] [Indexed: 01/21/2023] Open
Abstract
The plasma membrane of mammalian cells is composed of a great variety of different lipids which are laterally organized into lipid domains. The segregation of lipids into domains has been studied in great detail in vesicles but domain formation of lipids in the plasma membrane of live cells is still unclear. We have previously used fluorescence lifetime imaging microscopy to study the colocalization of the receptor for EGF with the ganglioside GM1 and the GPI-anchored green fluorescent protein. Here we have used this technology to study the effect of EGF on the organization of GM1 in the plasma membrane. Our data show that stimulation of the cell with EGF induces rapidly a strong increase in colocalization of GM1 molecules, suggesting the formation of large lipid domains. These results support the notion that activation of EGFR signaling may result in the formation of signaling platforms.
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Affiliation(s)
- Erik G Hofman
- Department of Cellular Architecture & Dynamics; Institute of Biomembranes; Science Faculty; Utrecht University; Utrecht, The Netherlands
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11
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Palero JA, Bader AN, de Bruijn HS, der Ploeg van den Heuvel AV, Sterenborg HJCM, Gerritsen HC. In vivo monitoring of protein-bound and free NADH during ischemia by nonlinear spectral imaging microscopy. Biomed Opt Express 2011; 2:1030-9. [PMID: 21559117 PMCID: PMC3087562 DOI: 10.1364/boe.2.001030] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2011] [Revised: 03/19/2011] [Accepted: 03/29/2011] [Indexed: 05/20/2023]
Abstract
Nonlinear spectral imaging microscopy (NSIM) allows simultaneous morphological and spectroscopic investigation of intercellular events within living animals. In this study we used NSIM for in vivo time-lapse in-depth spectral imaging and monitoring of protein-bound and free reduced nicotinamide adenine dinucleotide (NADH) in mouse keratinocytes following total acute ischemia for 3.3 h at ~3 min time intervals. The high spectral resolution of NSIM images allows discrimination between the two-photon excited fluorescence emission of protein-bound and free NAD(P)H by applying linear spectral unmixing to the spectral image data. Results reveal the difference in the dynamic response between protein-bound and free NAD(P)H to ischemia-induced hypoxia/anoxia. Our results demonstrate the capability of nonlinear spectral imaging microscopy in unraveling dynamic cellular metabolic events within living animals for long periods of time.
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Affiliation(s)
- Jonathan A. Palero
- Molecular BioPhysics, Utrecht University, 3584 CC Utrecht, The Netherlands
- Currently with ICFO-Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain
| | - Arjen N. Bader
- Molecular BioPhysics, Utrecht University, 3584 CC Utrecht, The Netherlands
| | - Henriëtte S. de Bruijn
- Department of Radiation Oncology,Center of Optical Diagnostics and Therapy, Erasmus Medical Center,3008 AE Rotterdam, The Netherlands
| | | | - Henricus J. C. M. Sterenborg
- Department of Radiation Oncology,Center of Optical Diagnostics and Therapy, Erasmus Medical Center,3008 AE Rotterdam, The Netherlands
| | - Hans C. Gerritsen
- Molecular BioPhysics, Utrecht University, 3584 CC Utrecht, The Netherlands
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12
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Bader AN, Hoetzl S, Hofman EG, Voortman J, van Bergen en Henegouwen PMP, van Meer G, Gerritsen HC. Inside Cover: Homo‐FRET Imaging as a Tool to Quantify Protein and Lipid Clustering (ChemPhysChem 3/2011). Chemphyschem 2011. [DOI: 10.1002/cphc.201190012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Arjen N. Bader
- Department of Molecular Biophysics, Universiteit Utrecht, Princetonplein 1, 3584 CC Utrecht (The Netherlands), Fax: (+31) 30 253 2706
| | - Sandra Hoetzl
- Department of Membrane Enzymology, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | - Erik G. Hofman
- Department of Cellular Dynamics, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | - Jarno Voortman
- Department of Cellular Dynamics, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | | | - Gerrit van Meer
- Department of Membrane Enzymology, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | - Hans C. Gerritsen
- Department of Molecular Biophysics, Universiteit Utrecht, Princetonplein 1, 3584 CC Utrecht (The Netherlands), Fax: (+31) 30 253 2706
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13
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Esposito A, Bader AN, Schlachter SC, van den Heuvel DJ, Schierle GSK, Venkitaraman AR, Kaminski CF, Gerritsen HC. Design and application of a confocal microscope for spectrally resolved anisotropy imaging. Opt Express 2011; 19:2546-2555. [PMID: 21369074 DOI: 10.1364/oe.19.002546] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Biophysical imaging tools exploit several properties of fluorescence to map cellular biochemistry. However, the engineering of a cost-effective and user-friendly detection system for sensing the diverse properties of fluorescence is a difficult challenge. Here, we present a novel architecture for a spectrograph that permits integrated characterization of excitation, emission and fluorescence anisotropy spectra in a quantitative and efficient manner. This sensing platform achieves excellent versatility of use at comparatively low costs. We demonstrate the novel optical design with example images of plant cells and of mammalian cells expressing fluorescent proteins undergoing energy transfer.
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Affiliation(s)
- Alessandro Esposito
- The Medical Research Council Cancer Cell Unit, Hutchison/MRC Research Centre, Hills Road, Cambridge CB2 0XZ, UK.
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14
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Bader AN, Pena AM, Johan van Voskuilen C, Palero JA, Leroy F, Colonna A, Gerritsen HC. Fast nonlinear spectral microscopy of in vivo human skin. Biomed Opt Express 2011; 2:365-73. [PMID: 21339881 PMCID: PMC3038451 DOI: 10.1364/boe.2.000365] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 12/17/2010] [Accepted: 01/14/2100] [Indexed: 05/25/2023]
Abstract
An optimized system for fast, high-resolution spectral imaging of in vivo human skin is developed and evaluated. The spectrograph is composed of a dispersive prism in combination with an electron multiplying CCD camera. Spectra of autofluorescence and second harmonic generation (SHG) are acquired at a rate of 8 kHz and spectral images within seconds. Image quality is significantly enhanced by the simultaneous recording of background spectra. In vivo spectral images of 224 × 224 pixels were acquired, background corrected and previewed in real RGB color in 6.5 seconds. A clear increase in melanin content in deeper epidermal layers in in vivo human skin was observed.
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Affiliation(s)
- Arjen N. Bader
- Molecular Biophysics, Utrecht University, 3508 TA Utrecht, The Netherlands
| | - Ana-Maria Pena
- L'Oréal Recherche et Innovation, 93600 Aulnay-sous-Bois, France
| | | | - Jonathan A. Palero
- Molecular Biophysics, Utrecht University, 3508 TA Utrecht, The Netherlands
- Present address, ICFO, 08860 Castelldefels, Spain
| | - Frédéric Leroy
- L'Oréal Recherche et Innovation, 93600 Aulnay-sous-Bois, France
| | - Anne Colonna
- L'Oréal Recherche et Innovation, 93600 Aulnay-sous-Bois, France
| | - Hans C. Gerritsen
- Molecular Biophysics, Utrecht University, 3508 TA Utrecht, The Netherlands
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Bader AN, Hoetzl S, Hofman EG, Voortman J, van Bergen en Henegouwen PMP, van Meer G, Gerritsen HC. Homo‐FRET Imaging as a Tool to Quantify Protein and Lipid Clustering. Chemphyschem 2010; 12:475-83. [DOI: 10.1002/cphc.201000801] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Indexed: 11/11/2022]
Affiliation(s)
- Arjen N. Bader
- Department of Molecular Biophysics, Universiteit Utrecht, Princetonplein 1, 3584 CC Utrecht (The Netherlands), Fax: (+31) 30 253 2706
| | - Sandra Hoetzl
- Department of Membrane Enzymology, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | - Erik G. Hofman
- Department of Cellular Dynamics, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | - Jarno Voortman
- Department of Cellular Dynamics, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | | | - Gerrit van Meer
- Department of Membrane Enzymology, Universiteit Utrecht, Padualaan 8, 3584 CH Utrecht (The Netherlands)
| | - Hans C. Gerritsen
- Department of Molecular Biophysics, Universiteit Utrecht, Princetonplein 1, 3584 CC Utrecht (The Netherlands), Fax: (+31) 30 253 2706
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16
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Hofman EG, Bader AN, Voortman J, van den Heuvel DJ, Sigismund S, Verkleij AJ, Gerritsen HC, van Bergen en Henegouwen PMP. Ligand-induced EGF receptor oligomerization is kinase-dependent and enhances internalization. J Biol Chem 2010; 285:39481-9. [PMID: 20940297 DOI: 10.1074/jbc.m110.164731] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The current activation model of the EGF receptor (EGFR) predicts that binding of EGF results in dimerization and oligomerization of the EGFR, leading to the allosteric activation of the intracellular tyrosine kinase. Little is known about the regulatory mechanism of receptor oligomerization. In this study, we have employed FRET between identical fluorophores (homo-FRET) to monitor the dimerization and oligomerization state of the EGFR before and after receptor activation. Our data show that, in the absence of ligand, ∼40% of the EGFR molecules were present as inactive dimers or predimers. The monomer/predimer ratio was not affected by deletion of the intracellular domain. Ligand binding induced the formation of receptor oligomers, which were found in both the plasma membrane and intracellular structures. Ligand-induced oligomerization required tyrosine kinase activity and nine different tyrosine kinase substrate residues. This indicates that the binding of signaling molecules to activated EGFRs results in EGFR oligomerization. Induction of EGFR predimers or pre-oligomers using the EGFR fused to the FK506-binding protein did not affect signaling but was found to enhance EGF-induced receptor internalization. Our data show that EGFR oligomerization is the result of EGFR signaling and enhances EGFR internalization.
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Affiliation(s)
- Erik G Hofman
- Department of Cellular Dynamics, Science Faculty, Utrecht University, 3584 CH Utrecht, The Netherlands
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17
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Bader AN, Hofman EG, Voortman J, en Henegouwen PMPVB, Gerritsen HC. Homo-FRET imaging enables quantification of protein cluster sizes with subcellular resolution. Biophys J 2010; 97:2613-22. [PMID: 19883605 DOI: 10.1016/j.bpj.2009.07.059] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 07/13/2009] [Accepted: 07/21/2009] [Indexed: 01/10/2023] Open
Abstract
Fluorescence-anisotropy-based homo-FRET detection methods can be employed to study clustering of identical proteins in cells. Here, the potential of fluorescence anisotropy microscopy for the quantitative imaging of protein clusters with subcellular resolution is investigated. Steady-state and time-resolved anisotropy detection and both one- and two-photon excitation methods are compared. The methods are evaluated on cells expressing green fluorescent protein (GFP) constructs that contain one or two FK506-binding proteins. This makes it possible to control dimerization and oligomerization of the constructs and yields the experimental relation between anisotropy and cluster size. The results show that, independent of the experimental method, the commonly made assumption of complete depolarization after a single energy transfer step is not valid here. This is due to a nonrandom relative orientation of the fluorescent proteins. Our experiments show that this relative orientation is restricted by interactions between the GFP barrels. We describe how the experimental relation between anisotropy and cluster size can be employed in quantitative cluster size imaging experiments of other GFP fusions. Experiments on glycosylphosphatidylinisotol (GPI)-anchored proteins reveal that GPI forms clusters with an average size of more than two subunits. For epidermal growth factor receptor (EGFR), we observe that approximately 40% of the unstimulated receptors are present in the plasma membrane as preexisting dimers. Both examples reveal subcellular heterogeneities in cluster size and distribution.
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Affiliation(s)
- Arjen N Bader
- Molecular Biophysics, Universiteit Utrecht, Utrecht, The Netherlands
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18
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Esposito A, Schlachter S, Bader AN, Pancheri L, Stoppa D, Venkitaraman AR, Kaminski C, Gerritsen HC. Multiplexed Measurement of Molecular Interactions using Hyper-Spectral Imaging and Multi-Parametric Detection. Biophys J 2010. [DOI: 10.1016/j.bpj.2009.12.4179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Klerk JSD, Bader AN, Zapotoczny S, Sterzel M, Pilch M, Danel A, Gooijer C, Ariese F. Excited-State Double Proton Transfer in 1H-Pyrazolo[3,4-b]quinoline Dimers. J Phys Chem A 2009; 113:5273-9. [DOI: 10.1021/jp8086545] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joost S. de Klerk
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Arjen N. Bader
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Szczepan Zapotoczny
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Monika Sterzel
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Mariusz Pilch
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Andrzej Danel
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Cees Gooijer
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
| | - Freek Ariese
- Analytical Chemistry & Applied Spectroscopy, Laser Centre Vrije Universiteit Amsterdam, The Netherlands, Department of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Krakow, Poland, and Department of Chemistry, Agricultural University of Krakow, Al. Mickiewicz 24/28, Krakow, 30-059, Poland
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20
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Hofman EG, Ruonala MO, Bader AN, van den Heuvel D, Voortman J, Roovers RC, Verkleij AJ, Gerritsen HC, van Bergen en Henegouwen PMP. EGF induces coalescence of different lipid rafts. J Cell Sci 2008; 121:2519-28. [DOI: 10.1242/jcs.028753] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The suggestion that microdomains may function as signaling platforms arose from the presence of growth factor receptors, such as the EGFR, in biochemically isolated lipid raft fractions. To investigate the role of EGFR activation in the organization of lipid rafts we have performed FLIM analyses using putative lipid raft markers such as ganglioside GM1 and glycosylphosphatidylinositol (GPI)-anchored GFP (GPI-GFP). The EGFR was labeled using single domain antibodies from Llama glama that specifically bind the EGFR without stimulating its kinase activity. Our FLIM analyses demonstrate a cholesterol-independent colocalization of GM1 with EGFR, which was not observed for the transferrin receptor. By contrast, a cholesterol-dependent colocalization was observed for GM1 with GPI-GFP. In the resting state no colocalization was observed between EGFR and GPI-GFP, but stimulation of the cell with EGF resulted in the colocalization at the nanoscale level of EGFR and GPI-GFP. Moreover, EGF induced the enrichment of GPI-GFP in a detergent-free lipid raft fraction. Our results suggest that EGF induces the coalescence of the two types of GM1-containing microdomains that might lead to the formation of signaling platforms.
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Affiliation(s)
- Erik G. Hofman
- Department of Cellular Architecture and Dynamics, Institute of Biomembranes, Utrecht University, Utrecht, The Netherlands
| | - Mika O. Ruonala
- Center for Membrane Proteomics, University of Frankfurt, Biocenter, Frankfurt am Main, Germany
| | - Arjen N. Bader
- Department of Molecular Biophysics, Utrecht University, Utrecht, The Netherlands
| | - Dave van den Heuvel
- Department of Molecular Biophysics, Utrecht University, Utrecht, The Netherlands
| | - Jarno Voortman
- Department of Cellular Architecture and Dynamics, Institute of Biomembranes, Utrecht University, Utrecht, The Netherlands
| | - Rob C. Roovers
- Department of Cellular Architecture and Dynamics, Institute of Biomembranes, Utrecht University, Utrecht, The Netherlands
| | - Arie J. Verkleij
- Department of Cellular Architecture and Dynamics, Institute of Biomembranes, Utrecht University, Utrecht, The Netherlands
| | - Hans C. Gerritsen
- Department of Molecular Biophysics, Utrecht University, Utrecht, The Netherlands
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Bader AN, Hofman EG, van Bergen En Henegouwen PMP, Gerritsen HC. Imaging of protein cluster sizes by means of confocal time-gated fluorescence anisotropy microscopy. Opt Express 2007; 15:6934-6945. [PMID: 19547008 DOI: 10.1364/oe.15.006934] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A time-resolved fluorescence anisotropy imaging method for studying nanoscale clustering of proteins or lipids was developed and evaluated. It is based on FRET between the identical fluorophores (homo-FRET), which results in a rapid depolarization of the fluorescence. The method employs the time-resolved fluorescence anisotropy decays recorded in a confocal microscope equipped with pulsed excitation and time-gated detection. From the decay the limiting anisotropy r(inf) was derived, which is a direct measure for the number of fluorophores per cluster. The method was evaluated by imaging GPI-GFP, a lipid raft marker. Small clusters were observed in the plasma membrane while the cytoplasm and the Golgi contained predominantly monomers.
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Bader AN, van Dongen MM, van Lipzig MMH, Kool J, Meerman JHN, Ariese F, Gooijer C. The chemical interaction between the estrogen receptor and monohydroxybenzo[a]pyrene derivatives studied by fluorescence line-narrowing spectroscopy. Chem Res Toxicol 2005; 18:1405-12. [PMID: 16167832 DOI: 10.1021/tx050056c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel approach is presented for studying the chemical interaction between receptor binding sites and ligands. Monohydroxylated polyaromatic compounds were found to be environmentally sensitive ligands when applying a special mode of fluorescence: fluorescence line-narrowing spectroscopy (FLNS). With this technique, solvent dependencies and ligand-receptor interactions can be studied in great detail, due to the high spectral resolution and the fact that at cryogenic temperatures (4 K), no solvent reorientation effects complicate the interpretation. The FLN spectrum of a ligand bound to the receptor is compared to the spectra of the free ligand in solvent mixtures that mimic the functionalities present within the receptor's binding site. It is shown that for the well-known estrogen receptor (ER), the orientations of two xenoestrogenic ligands 3- and 9-hydroxybenzo[a]pyrene (3- and 9-OH-BaP) can be determined. The FLN results clearly indicate that an H-bond accepted by HIS524 plays a major role in the binding of these ligands to the ER. Furthermore, the spectra indicated a pi-pi stacking aromatic interaction for 9-OH-BaP with PHE404. These results are in line with molecular modeling studies published earlier.
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Affiliation(s)
- Arjen N Bader
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Amsterdam, The Netherlands
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23
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Bader AN, Pivovarenko VG, Demchenko AP, Ariese F, Gooijer C. Excited State and Ground State Proton Transfer Rates of 3-Hydroxyflavone and Its Derivatives Studied by Shpol'skii Spectroscopy: The Influence of Redistribution of Electron Density. J Phys Chem B 2004. [DOI: 10.1021/jp048925e] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arjen N. Bader
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Department of Chemistry, Organic Chemistry Chair, Kiev National Taras Shevchenko University, Kiev 01033, Ukraine, and TUBITAK Research Institute for Genetic Engineering and Biotechnology, Gebze-Kocaeli 41470, Turkey
| | - Vasyl G. Pivovarenko
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Department of Chemistry, Organic Chemistry Chair, Kiev National Taras Shevchenko University, Kiev 01033, Ukraine, and TUBITAK Research Institute for Genetic Engineering and Biotechnology, Gebze-Kocaeli 41470, Turkey
| | - Alexander P. Demchenko
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Department of Chemistry, Organic Chemistry Chair, Kiev National Taras Shevchenko University, Kiev 01033, Ukraine, and TUBITAK Research Institute for Genetic Engineering and Biotechnology, Gebze-Kocaeli 41470, Turkey
| | - Freek Ariese
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Department of Chemistry, Organic Chemistry Chair, Kiev National Taras Shevchenko University, Kiev 01033, Ukraine, and TUBITAK Research Institute for Genetic Engineering and Biotechnology, Gebze-Kocaeli 41470, Turkey
| | - Cees Gooijer
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands, Department of Chemistry, Organic Chemistry Chair, Kiev National Taras Shevchenko University, Kiev 01033, Ukraine, and TUBITAK Research Institute for Genetic Engineering and Biotechnology, Gebze-Kocaeli 41470, Turkey
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Bader AN, Grubor NM, Ariese F, Gooijer C, Jankowiak R, Small GJ. Probing the Interaction of Benzo[a]pyrene Adducts and Metabolites with Monoclonal Antibodies Using Fluorescence Line-Narrowing Spectroscopy. Anal Chem 2004; 76:761-6. [PMID: 14750873 DOI: 10.1021/ac034548a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new approach for studying antibody-antigen interactions of DNA adducts and metabolites of polycyclic aromatic hydrocarbons (PAHs) is demonstrated in which fluorescence line-narrowing spectroscopy (FLNS) is used. It is based on the fact that in an FLN spectrum the relative intensities of the line-narrowed bands (that correspond to the excited-state vibrations) are, in general, strongly dependent on the local environment of the fluorophore. Information on the nature of the interactions can be obtained by comparing the FLN spectra of the antigen-antibody complexes to the spectra of the antigen in different types of solvents (H-bonding, aprotic, and pi-electron-containing solvent molecules) recorded under the same conditions. The antigens used were the DNA adduct 7-(benzo[a]pyren-6-yl)guanine (BP-6-N7Gua) and the metabolite (+)-trans-anti-7,8,9,10-benzo[a]pyrenetetrol (BP-tetrol) of benzo[a]pyrene; two monoclonal antibodies (MAbs) have been developed to selectively bind these compounds. It is shown that, for BP-tetrol, H-bonding solvents have a pronounced effect on the FLN spectra. The presence of pi electrons in the solvent molecules results in relatively small but still significant changes in the spectra. When BP-tetrol is bound to its MAb, however, neither of these effects is observed; its spectrum is very similar to the one obtained with an aprotic solvent, methylcyclohexane. Therefore, we can conclude that this MAb has an internal binding site in which the interaction with BP-tetrol is of a hydrophobic character. For BP-6-N7Gua, however, there is a strong effect of the presence of pi electrons in the solvent molecules. The FLN spectrum of this antigen bound to its MAb is very similar to its spectrum in acetone, indicating that pi-pi interactions play an important role in the binding.
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Affiliation(s)
- Arjen N Bader
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Bader AN, Pivovarenko V, Demchenko AP, Ariese F, Gooijer C. Solvent influence on excited-state intramolecular proton transfer in 3-hydroxychromone derivatives studied by cryogenic high-resolution fluorescence spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2003; 59:1593-1603. [PMID: 12714082 DOI: 10.1016/s1386-1425(02)00361-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
High-resolution Shpol'skii spectra (recorded at 10 K in n-octane) of 3-hydroxychromone (3HC) substituted at the 2-position with a furan (3HC-F), a benzofuran (3HC-BF) or a naphthofuran group (3HC-NF) are presented. Being close analogues of 3-hydroxyflavone (3HF), these compounds can undergo excited-state intramolecular proton transfer (ESIPT). Luminescence can occur from the normal N* state (blue) or from the tautomeric T* state (green). Whether blue or green emission is observed is strongly dependent on hydrogen-bonding interactions with the environment. For all three chromones studied, high-resolution emission spectra in the green region (T*-->T) were obtained in pure n-octane, showing four sites with distinct emission bands and detailed vibrational structures, whereas no blue emission was detected. Contrary to the spectra published for 3HF, the emission lines were very narrow (line-broadening effects beyond detection) which implies that the ESIPT rate constants are >10(12) s(-1), at least 25 times lower than for 3HF. In order to study the effects of hydrogen-bonding solvents, four isomers of octanol (1-, 2-, 3- and 4-octanol) were added, forming 1:1 complexes with the 3HC derivatives. For all the combinations considered both blue and additional green emission was observed and in some cases narrow-banded spectra were obtained, mostly in the green. Only for the 3HC-NF/2-octanol complex, narrow-banded emission was found both in the blue and in the green region. It is demonstrated that these emissions come from different configurations of the complex. Possible structures for the two complex species are proposed, supported by semi-empirical calculations on complex formation enthalpies.
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Affiliation(s)
- Arjen N Bader
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV, Amsterdam, The Netherlands
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Bader AN, Ariese F, Gooijer C. Proton Transfer in 3-Hydroxyflavone Studied by High-Resolution 10 K Laser-Excited Shpol'skii Spectroscopy. J Phys Chem A 2002. [DOI: 10.1021/jp013840o] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arjen N. Bader
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Freek Ariese
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Cees Gooijer
- Department of Analytical Chemistry and Applied Spectroscopy, Laser Centre, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Dijkstra RJ, Bader AN, Hoornweg GP, Brinkman UAT, Gooijer C. On-Line Coupling of Column Liquid Chromatography and Raman Spectroscopy Using a Liquid Core Waveguide. Anal Chem 1999. [DOI: 10.1021/ac9902648] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Reyer J. Dijkstra
- Department of Analytical Chemistry and Applied Spectroscopy, Division of Chemistry, Free University Amsterdam, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Arjen N. Bader
- Department of Analytical Chemistry and Applied Spectroscopy, Division of Chemistry, Free University Amsterdam, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Gerard Ph. Hoornweg
- Department of Analytical Chemistry and Applied Spectroscopy, Division of Chemistry, Free University Amsterdam, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Udo A. Th. Brinkman
- Department of Analytical Chemistry and Applied Spectroscopy, Division of Chemistry, Free University Amsterdam, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
| | - Cees Gooijer
- Department of Analytical Chemistry and Applied Spectroscopy, Division of Chemistry, Free University Amsterdam, de Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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