1
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Zhu H, Xu C, Wang DW, Yakovlev VV, Zhang D. Enhanced Chemical Sensing with Multiorder Coherent Raman Scattering Spectroscopic Dephasing. Anal Chem 2022; 94:8409-8415. [PMID: 35623094 DOI: 10.1021/acs.analchem.2c01060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Molecular vibrational spectroscopy is widely used in various sensing and imaging applications, providing intrinsic information at the molecular level. Nonlinear optical interactions using ultrashort laser pulses facilitate the selective coherent excitation of molecular vibrational modes by focusing energy into specific molecular bonds, boosting the signal level for multiple orders of magnitude. The dephasing of such coherence, which is susceptible to the local molecular environment, however, is often neglected. The unique capability of vibrational dephasing dynamics to serve as a unique probe for complex molecular interactions and the effect of local nano- and microenvironments are beyond the reach of conventional, intensity-based spectroscopy. Here, we developed a novel multiorder coherent Raman spectroscopy platform with a special focus on the temporal evolution of molecular vibrational dephasing, termed as time-resolved coherent Raman scattering (T-CRS) spectroscopy. By utilizing a high dynamic range detection, molecular vibrational dynamics and the environmental effects are demonstrated with multidimensional spectroscopic sensing, which promises a new range of applications in biology, materials, and chemical sciences.
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Affiliation(s)
- Hanlin Zhu
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
| | - Chenran Xu
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
| | - Da-Wei Wang
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
| | - Vladislav V Yakovlev
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843 United States.,Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843 United States.,Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843 United States
| | - Delong Zhang
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
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2
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Plant Sterol Clustering Correlates with Membrane Microdomains as Revealed by Optical and Computational Microscopy. MEMBRANES 2021; 11:membranes11100747. [PMID: 34677513 PMCID: PMC8539253 DOI: 10.3390/membranes11100747] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 11/26/2022]
Abstract
Local inhomogeneities in lipid composition play a crucial role in the regulation of signal transduction and membrane traffic. This is particularly the case for plant plasma membrane, which is enriched in specific lipids, such as free and conjugated forms of phytosterols and typical phytosphingolipids. Nevertheless, most evidence for microdomains in cells remains indirect, and the nature of membrane inhomogeneities has been difficult to characterize. We used a new push–pull pyrene probe and fluorescence lifetime imaging microscopy (FLIM) combined with all-atom multiscale molecular dynamics simulations to provide a detailed view on the interaction between phospholipids and phytosterol and the effect of modulating cellular phytosterols on membrane-associated microdomains and phase separation formation. Our understanding of the organization principles of biomembranes is limited mainly by the challenge to measure distributions and interactions of lipids and proteins within the complex environment of living cells. Comparing phospholipids/phytosterol compositions typical of liquid-disordered (Ld) and liquid-ordered (Lo) domains, we furthermore show that phytosterols play crucial roles in membrane homeostasis. The simulation work highlights how state-of-the-art modeling alleviates some of the prior concerns and how unrefuted discoveries can be made through a computational microscope. Altogether, our results support the role of phytosterols in the lateral structuring of the PM of plant cells and suggest that they are key compounds for the formation of plant PM microdomains and the lipid-ordered phase.
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3
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Osella S, Paloncýová M, Sahi M, Knippenberg S. Influence of Membrane Phase on the Optical Properties of DPH. Molecules 2020; 25:E4264. [PMID: 32957614 PMCID: PMC7570797 DOI: 10.3390/molecules25184264] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 09/05/2020] [Accepted: 09/14/2020] [Indexed: 11/24/2022] Open
Abstract
The fluorescent molecule diphenylhexatriene (DPH) has been often used in combination with fluorescence anisotropy measurements, yet little is known regarding the non-linear optical properties. In the current work, we focus on them and extend the application to fluorescence, while paying attention to the conformational versatility of DPH when it is embedded in different membrane phases. Extensive hybrid quantum mechanics/molecular mechanics calculations were performed to investigate the influence of the phase- and temperature-dependent lipid environment on the probe. Already, the transition dipole moments and one-photon absorption spectra obtained in the liquid ordered mixture of sphingomyelin (SM)-cholesterol (Chol) (2:1) differ largely from the ones calculated in the liquid disordered DOPC and solid gel DPPC membranes. Throughout the work, the molecular conformation in SM:Chol is found to differ from the other environments. The two-photon absorption spectra and the ones obtained by hyper-Rayleigh scattering depend strongly on the environment. Finally, a stringent comparison of the fluorescence anisotropy decay and the fluorescence lifetime confirm the use of DPH to gain information upon the surrounding lipids and lipid phases. DPH might thus open the possibility to detect and analyze different biological environments based on its absorption and emission properties.
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Affiliation(s)
- Silvio Osella
- Chemical and Biological Systems Simulation Lab, Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Markéta Paloncýová
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
| | - Maryam Sahi
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
| | - Stefan Knippenberg
- Regional Centre of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacký University Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic;
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, SE-10691 Stockholm, Sweden;
- Theory Lab, Hasselt University, Agoralaan Building D, 3590 Diepenbeek, Belgium
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4
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Finn S, Byrne A, Gkika KS, Keyes TE. Photophysics and Cell Uptake of Self-Assembled Ru(II)Polypyridyl Vesicles. Front Chem 2020; 8:638. [PMID: 32850654 PMCID: PMC7406788 DOI: 10.3389/fchem.2020.00638] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 05/19/2020] [Indexed: 12/04/2022] Open
Abstract
Effective delivery of luminescent probes for cell imaging requires both cell membrane permeation and directing to discrete target organelles. Combined, these requirements can present a significant challenge for metal complex luminophores, that have excellent properties as imaging probes but typically show poor membrane permeability. Here, we report on highly luminescent Ruthenium polypyridyl complexes based on the parent; [Ru(dpp)2(x-ATAP)](PF6)2 structure, where dpp is 4,7-diphenyl-1,10-phenanthroline and x-ATAP is 5-amino-1,10-phenanthroline with pendant alkyl-acetylthio chains of varying length; where x is 6; 5-Amido-1,10-phenanthroline-(6-acetylthio-hexanyl). 8; 5-Amido-1,10-phenanthroline-(8-acetylthio-octanyl). 11; 5-Amido-1,10-phenanthroline-(11-acetylthio-undecanyl); and 16; 5-Amido-1,10-phenanthroline-(16-acetylthio-hexadecanyl). Soluble in organic media, the alkyl-acetylthiolated complexes form nanoaggregates of low polydispersity in aqueous solution. From dynamic light scattering the nanoaggregate diameter was measured as 189 nm and 135 nm for 5 × 10-6 M aqueous solutions of [Ru(dpp)2(N∧N)](PF6)2 with the hexadecanoyl and hexanyl tails respectivly. The nanoaggregate exhibited dual exponential emission decays with kinetics that matched closely those of the [Ru(dpp)2(16-ATAP)]2+ incorporated into the membrane of a DPPC liposome. Cell permeability and distribution of [Ru(dpp)2(11-ATAP)]2+ or [Ru(dpp)2(16-ATAP)]2+ were evaluated in detail in live HeLa and CHO cell lines and it was found from aqueous media, that the nanoaggregate complexes spontaneously cross the membrane of mammalian cells. This process seems, on the basis of temperature dependent studies to be activated. Fluorescence imaging of live cells reveal that the complexes localize highly specifically within organelles and that organelle localization changes dramatically in switching the pendent alkyl chains from C16 to C11 as well as on cell line identity. Our data suggests that building metal complexes capable of self-assembling into nano-dimensional vesicles in this way may be a useful means of promoting cell membrane permeability and driving selective targeting that is facile and relatively low cost compared to use of biomolecular vectors.
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Affiliation(s)
| | | | | | - Tia E. Keyes
- School of Chemical Sciences and National Centre for Sensor Research, Dublin City University, Dublin, Ireland
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5
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Abstract
Many critical biological events, including biochemical signaling, membrane traffic, and cell motility, originate at membrane surfaces. Each such event requires that members of a specific group of proteins and lipids rapidly assemble together at a specific site on the membrane surface. Understanding the biophysical mechanisms that stabilize these assemblies is critical to decoding and controlling cellular functions. In this article, we review progress toward a quantitative biophysical understanding of the mechanisms that drive membrane heterogeneity and organization. We begin from a physical perspective, reviewing the fundamental principles and key experimental evidence behind each proposed mechanism. We then shift to a biological perspective, presenting key examples of the role of heterogeneity in biology and asking which physical mechanisms may be responsible. We close with an applied perspective, noting that membrane heterogeneity provides a novel therapeutic target that is being exploited by a growing number of studies at the interface of biology, physics, and engineering.
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Affiliation(s)
- Wade F Zeno
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA;
| | - Kasey J Day
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA;
| | - Vernita D Gordon
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, USA
- Center for Nonlinear Dynamics, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Jeanne C Stachowiak
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA;
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, USA
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6
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Osella S, Knippenberg S. Laurdan as a Molecular Rotor in Biological Environments. ACS APPLIED BIO MATERIALS 2019; 2:5769-5778. [DOI: 10.1021/acsabm.9b00789] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Silvio Osella
- Chemical and Biological Systems Simulation Lab, Centre of New Technologies, University of Warsaw, Banacha 2C, 02-097 Warsaw, Poland
| | - Stefan Knippenberg
- RCPTM, Department of Physical Chemistry, Fac. Sciences, Palacký University, 771 46 Olomouc, Czech Republic
- Theoretical Physics, Hasselt University, Agoralaan Building D, 3590 Diepenbeek, Belgium
- Department of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
- Research Group PLASMANT, Department of Chemistry, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium
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7
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Dimova R. Giant Vesicles and Their Use in Assays for Assessing Membrane Phase State, Curvature, Mechanics, and Electrical Properties. Annu Rev Biophys 2019; 48:93-119. [DOI: 10.1146/annurev-biophys-052118-115342] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Giant unilamellar vesicles represent a promising and extremely useful model biomembrane system for systematic measurements of mechanical, thermodynamic, electrical, and rheological properties of lipid bilayers as a function of membrane composition, surrounding media, and temperature. The most important advantage of giant vesicles over other model membrane systems is that the membrane responses to external factors such as ions, (macro)molecules, hydrodynamic flows, or electromagnetic fields can be directly observed under the microscope. Here, we briefly review approaches for giant vesicle preparation and describe several assays used for deducing the membrane phase state and measuring a number of material properties, with further emphasis on membrane reshaping and curvature.
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Affiliation(s)
- Rumiana Dimova
- Max Planck Institute of Colloids and Interfaces, Science Park Golm, 14424 Potsdam, Germany
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8
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Visualizing Biological Membrane Organization and Dynamics. J Mol Biol 2019; 431:1889-1919. [DOI: 10.1016/j.jmb.2019.02.018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 02/02/2019] [Accepted: 02/13/2019] [Indexed: 11/22/2022]
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9
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Osella S, Di Meo F, Murugan NA, Fabre G, Ameloot M, Trouillas P, Knippenberg S. Combining (Non)linear Optical and Fluorescence Analysis of DiD To Enhance Lipid Phase Recognition. J Chem Theory Comput 2018; 14:5350-5359. [DOI: 10.1021/acs.jctc.8b00553] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Silvio Osella
- Centre of New Technologies, University of Warsaw, Banacha 2C, 02-097 Warsaw, Poland
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Florent Di Meo
- Faculty of Pharmacy, UMR 1248 INSERM, Limoges University, 2 rue du Docteur Marcland, 87025 Limoges Cedex, France
| | - N. Arul Murugan
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Gabin Fabre
- LCSN-EA1069, Faculty of Pharmacy, Limoges University, 2, rue du Dr. Marcland, 87025 Limoges Cedex, France
| | - Marcel Ameloot
- Biomedical Research Institute, Hasselt University, B-3590, Diepenbeek, Belgium
| | - Patrick Trouillas
- Faculty of Pharmacy, UMR 1248 INSERM, Limoges University, 2 rue du Docteur Marcland, 87025 Limoges Cedex, France
- Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University, tř. 17 listopadu 12, 771 46 Olomouc, Czech Republic
| | - Stefan Knippenberg
- Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-10691 Stockholm, Sweden
- Biomedical Research Institute, Hasselt University, B-3590, Diepenbeek, Belgium
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10
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Sharma V, Sahoo D, Chandra F, Koner AL. Highly Fluorescent Peri
-functionalized Perylenemonoimide Derivatives with Tunable Optical Properties for Selective Sensing of Electron-rich Aromatic Amines. ChemistrySelect 2017. [DOI: 10.1002/slct.201702368] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Vikas Sharma
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal Bypass Road Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Dhananjaya Sahoo
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal Bypass Road Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Falguni Chandra
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal Bypass Road Bhauri, Bhopal 462066, Madhya Pradesh India
| | - Apurba L. Koner
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal Bypass Road Bhauri, Bhopal 462066, Madhya Pradesh India
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11
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Osella S, Knippenberg S. Triggering On/Off States of Photoswitchable Probes in Biological Environments. J Am Chem Soc 2017; 139:4418-4428. [DOI: 10.1021/jacs.6b13024] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Silvio Osella
- Division of Theoretical Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Stefan Knippenberg
- Division of Theoretical Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
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12
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Osella S, Murugan NA, Jena NK, Knippenberg S. Investigation into Biological Environments through (Non)linear Optics: A Multiscale Study of Laurdan Derivatives. J Chem Theory Comput 2016; 12:6169-6181. [DOI: 10.1021/acs.jctc.6b00906] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Silvio Osella
- Division of Theoretical
Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - N. Arul Murugan
- Division of Theoretical
Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Naresh K. Jena
- Division of Theoretical
Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - Stefan Knippenberg
- Division of Theoretical
Chemistry
and Biology, School of Biotechnology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
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13
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Chen L, Zhang K, Zhu L, Xiao Y. New and Efficient Approach to the Versatile Building Block of 3,4-Perylenedicarboxylic Monoanhydride. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b04203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lingcheng Chen
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China
| | - Kaichen Zhang
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China
| | - Linlin Zhu
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China
| | - Yi Xiao
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, P. R. China
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14
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Kilin V, Glushonkov O, Herdly L, Klymchenko A, Richert L, Mely Y. Fluorescence lifetime imaging of membrane lipid order with a ratiometric fluorescent probe. Biophys J 2015; 108:2521-2531. [PMID: 25992730 PMCID: PMC4457243 DOI: 10.1016/j.bpj.2015.04.003] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 03/23/2015] [Accepted: 04/03/2015] [Indexed: 12/11/2022] Open
Abstract
To monitor the lateral segregation of lipids into liquid-ordered (Lo) and -disordered (Ld) phases in lipid membranes, environment-sensitive dyes that partition in both phases but stain them differently have been developed. Of particular interest is the dual-color F2N12S probe, which can discriminate the two phases through the ratio of its two emission bands. These bands are associated with the normal (N(∗)) and tautomer (T(∗)) excited-state species that result from an excited-state intramolecular proton transfer. In this work, we investigated the potency of the time-resolved fluorescence parameters of F2N12S to discriminate lipid phases in model and cell membranes. Both the long and mean lifetime values of the T(∗) form of F2N12S were found to differ by twofold between Ld and Lo phases as a result of the restriction in the relative motions of the two aromatic moieties of F2N12S imposed by the highly packed Lo phase. This differed from the changes in the ratio of the two emission bands between the two phases, which mainly resulted from the decreased hydration of the N(∗) form in the Lo phase. Importantly, the strong difference in lifetimes between the two phases was preserved when cholesterol was added to the Ld phase. The two phases could be imaged with high contrast by fluorescence lifetime imaging microscopy (FLIM) on giant unilamellar vesicles. FLIM images of F2N12S-labeled live HeLa cells confirmed that the plasma membrane was mainly in the Lo-like phase. Furthermore, the two phases were found to be homogeneously distributed all over the plasma membrane, indicating that they are highly mixed at the spatiotemporal resolution of the FLIM setup. Finally, FLIM could also be used to sensitively monitor the change in lipid phase upon cholesterol depletion and apoptosis.
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Affiliation(s)
- Vasyl Kilin
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, Illkirch Cedex, France
| | - Oleksandr Glushonkov
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, Illkirch Cedex, France
| | - Lucas Herdly
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, Illkirch Cedex, France
| | - Andrey Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, Illkirch Cedex, France
| | - Ludovic Richert
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, Illkirch Cedex, France
| | - Yves Mely
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Faculté de Pharmacie, Université de Strasbourg, Illkirch Cedex, France.
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15
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Hutchison JA, Uji-i H, Deres A, Vosch T, Rocha S, Müller S, Bastian AA, Enderlein J, Nourouzi H, Li C, Herrmann A, Müllen K, De Schryver F, Hofkens J. A surface-bound molecule that undergoes optically biased Brownian rotation. NATURE NANOTECHNOLOGY 2014; 9:131-6. [PMID: 24441983 DOI: 10.1038/nnano.2013.285] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2013] [Accepted: 11/25/2013] [Indexed: 05/09/2023]
Abstract
Developing molecular systems with functions analogous to those of macroscopic machine components, such as rotors, gyroscopes and valves, is a long-standing goal of nanotechnology. However, macroscopic analogies go only so far in predicting function in nanoscale environments, where friction dominates over inertia. In some instances, ratchet mechanisms have been used to bias the ever-present random, thermally driven (Brownian) motion and drive molecular diffusion in desired directions. Here, we visualize the motions of surface-bound molecular rotors using defocused fluorescence imaging, and observe the transition from hindered to free Brownian rotation by tuning medium viscosity. We show that the otherwise random rotations can be biased by the polarization of the excitation light field, even though the associated optical torque is insufficient to overcome thermal fluctuations. The biased rotation is attributed instead to a fluctuating-friction mechanism in which photoexcitation of the rotor strongly inhibits its diffusion rate.
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Affiliation(s)
- James A Hutchison
- 1] Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium [2] ISIS & icFRC, Université de Strasbourg & CNRS UMR 7006, Strasbourg 67000, France
| | - Hiroshi Uji-i
- Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium
| | - Ania Deres
- Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium
| | - Tom Vosch
- Nano-Science Center/Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
| | - Susana Rocha
- Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium
| | - Sibylle Müller
- Synthetic Chemistry Group, Max Plank Institute for Polymer Research, Mainz D-55128 Germany
| | - Andreas A Bastian
- Department of Polymer Chemistry, Zernike Institute for Advanced Materials, Rijksuniversiteit Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Jörg Enderlein
- Drittes Physikalisches Institut, Universität Göttingen, Göttingen D-37077 Germany
| | - Hassan Nourouzi
- Synthetic Chemistry Group, Max Plank Institute for Polymer Research, Mainz D-55128 Germany
| | - Chen Li
- Synthetic Chemistry Group, Max Plank Institute for Polymer Research, Mainz D-55128 Germany
| | - Andreas Herrmann
- Department of Polymer Chemistry, Zernike Institute for Advanced Materials, Rijksuniversiteit Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Klaus Müllen
- Synthetic Chemistry Group, Max Plank Institute for Polymer Research, Mainz D-55128 Germany
| | - Frans De Schryver
- Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium
| | - Johan Hofkens
- 1] Laboratory for Photochemistry and Spectroscopy, Katholieke Universiteit Leuven, Heverlee 3001 Belgium [2] Nano-Science Center/Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
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16
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Benfenati V, Toffanin S, Bonetti S, Turatti G, Pistone A, Chiappalone M, Sagnella A, Stefani A, Generali G, Ruani G, Saguatti D, Zamboni R, Muccini M. A transparent organic transistor structure for bidirectional stimulation and recording of primary neurons. NATURE MATERIALS 2013; 12:672-80. [PMID: 23644524 DOI: 10.1038/nmat3630] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Accepted: 03/14/2013] [Indexed: 05/20/2023]
Abstract
Real-time stimulation and recording of neural cell bioelectrical activity could provide an unprecedented insight in understanding the functions of the nervous system, and it is crucial for developing advanced in vitro drug screening approaches. Among organic materials, suitable candidates for cell interfacing can be found that combine long-term biocompatibility and mechanical flexibility. Here, we report on transparent organic cell stimulating and sensing transistors (O-CSTs), which provide bidirectional stimulation and recording of primary neurons. We demonstrate that the device enables depolarization and hyperpolarization of the primary neuron membrane potential. The transparency of the device also allows the optical imaging of the modulation of the neuron bioelectrical activity. The maximal amplitude-to-noise ratio of the extracellular recording achieved by the O-CST device exceeds that of a microelectrode array system on the same neuronal preparation by a factor of 16. Our organic cell stimulating and sensing device paves the way to a new generation of devices for stimulation, manipulation and recording of cell bioelectrical activity in vitro and in vivo.
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Affiliation(s)
- Valentina Benfenati
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività, via Gobetti, 101, 40129 Bologna, Italy.
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Heek T, Nikolaus J, Schwarzer R, Fasting C, Welker P, Licha K, Herrmann A, Haag R. An Amphiphilic Perylene Imido Diester for Selective Cellular Imaging. Bioconjug Chem 2013; 24:153-8. [DOI: 10.1021/bc3005655] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Timm Heek
- Institut für Chemie und
Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Jörg Nikolaus
- Institut für Biologie/Molekulare
Biophysik, Humboldt Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany
| | - Roland Schwarzer
- Institut für Biologie/Molekulare
Biophysik, Humboldt Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany
| | - Carlo Fasting
- Institut für Chemie und
Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
| | - Pia Welker
- mivenion GmbH, Robert-Koch-Platz
4, 10115 Berlin, Germany
| | - Kai Licha
- mivenion GmbH, Robert-Koch-Platz
4, 10115 Berlin, Germany
| | - Andreas Herrmann
- Institut für Biologie/Molekulare
Biophysik, Humboldt Universität zu Berlin, Invalidenstraße 42, 10115 Berlin, Germany
| | - Rainer Haag
- Institut für Chemie und
Biochemie, Freie Universität Berlin, Takustraße 3, 14195 Berlin, Germany
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18
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Štefl M, Šachl R, Humpolíčková J, Cebecauer M, Macháň R, Kolářová M, Johansson LBÅ, Hof M. Dynamics and size of cross-linking-induced lipid nanodomains in model membranes. Biophys J 2012; 102:2104-13. [PMID: 22824274 DOI: 10.1016/j.bpj.2012.03.054] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2012] [Revised: 03/21/2012] [Accepted: 03/23/2012] [Indexed: 01/05/2023] Open
Abstract
Changes of membrane organization upon cross-linking of its components trigger cell signaling response to various exogenous factors. Cross-linking of raft gangliosides GM1 with cholera toxin (CTxB) was shown to cause microscopic phase separation in model membranes, and the CTxB-GM1 complexes forming a minimal lipid raft unit are the subject of ongoing cell membrane research. Yet, those subdiffraction sized rafts have never been described in terms of size and dynamics. By means of two-color z-scan fluorescence correlation spectroscopy, we show that the nanosized domains are formed in model membranes at lower sphingomyelin (Sph) content than needed for the large-scale phase separation and that the CTxB-GM1 complexes are confined in the domains poorly stabilized with Sph. Förster resonance energy transfer together with Monte Carlo modeling of the donor decay response reveal the domain radius of ~8 nm, which increases at higher Sph content. We observed two types of domains behaving differently, which suggests a dual role of the cross-linker: first, local transient condensation of the GM1 molecules compensating for a lack of Sph and second, coalescence of existing nanodomains ending in large-scale phase separation.
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Affiliation(s)
- Martin Štefl
- Department of Biophysical Chemistry, J. Heyrovsky Institute of Physical Chemistry of the Academy of Sciences of the Czech Republic, Dolejškova, Prague, Czech Republic
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Doval DA, Fin A, Takahashi-Umebayashi M, Riezman H, Roux A, Sakai N, Matile S. Amphiphilic dynamic NDI and PDI probes: imaging microdomains in giant unilamellar vesicles. Org Biomol Chem 2012; 10:6087-93. [DOI: 10.1039/c2ob25119a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Goldsmith RH, Moerner WE. Watching conformational- and photo-dynamics of single fluorescent proteins in solution. Nat Chem 2011; 2:179-86. [PMID: 20625479 PMCID: PMC2899709 DOI: 10.1038/nchem.545] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Observing the dynamics of single biomolecules over prolonged time periods is difficult to achieve without significantly altering the molecule through immobilization. It can, however, be accomplished using the Anti-Brownian ELectrokinetic (ABEL) Trap, which allows extended investigation of solution-phase biomolecules - without immobilization -through real-time electrokinetic feedback. Here we apply the ABEL trap to study an important photosynthetic antenna protein, Allophycocyanin (APC). The technique allows the observation of single molecules of solution-phase APC for more than one second. We observe a complex relationship between fluorescence intensity and lifetime that cannot be explained by simple static kinetic models. Light-induced conformational changes are shown to occur and evidence is obtained for fluctuations in the spontaneous emission lifetime, which is typically assumed to be constant. Our methods provide a new window into the dynamics of fluorescent proteins and the observations are relevant for the interpretation of in vivo single-molecule imaging experiments, bacterial photosynthetic regulation, and biomaterials for solar energy harvesting.
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21
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AFM characterization of spin-coated multilayered dry lipid films prepared from aqueous vesicle suspensions. Colloids Surf B Biointerfaces 2011; 82:25-32. [DOI: 10.1016/j.colsurfb.2010.08.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2010] [Revised: 07/26/2010] [Accepted: 08/04/2010] [Indexed: 11/20/2022]
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22
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Mizuno H, Abe M, Dedecker P, Makino A, Rocha S, Ohno-Iwashita Y, Hofkens J, Kobayashi T, Miyawaki A. Fluorescent probes for superresolution imaging of lipid domains on the plasma membrane. Chem Sci 2011. [DOI: 10.1039/c1sc00169h] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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23
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Weil T, Vosch T, Hofkens J, Peneva K, Müllen K. Rylenfarbstoffe als maßgeschneiderte Nanoemitter für die Photonik. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200902532] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Weil T, Vosch T, Hofkens J, Peneva K, Müllen K. The Rylene Colorant Family-Tailored Nanoemitters for Photonics Research and Applications. Angew Chem Int Ed Engl 2010; 49:9068-93. [DOI: 10.1002/anie.200902532] [Citation(s) in RCA: 520] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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25
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Botchway SW, Lewis AM, Stubbs CD. Development of fluorophore dynamics imaging as a probe for lipid domains in model vesicles and cell membranes. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2010; 40:131-41. [PMID: 20953783 DOI: 10.1007/s00249-010-0631-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Revised: 09/27/2010] [Accepted: 09/28/2010] [Indexed: 11/28/2022]
Abstract
The ability to detect raft structures in membranes continues to present a problem, especially in the membranes of live cells. Rafts, generally considered to be small (< 200 nm) sphingolipid-rich regions, are commonly modelled using lipid vesicle systems where the ability of fluorophore-labelled lipids to preferentially locate into domains (basically large rafts) is investigated. Instead, in this study the motional properties of different fluorophores were determined using two-photon excitation and time-correlated single-photon counting coupled with diffraction-limited imaging with polarizing optics in scanning mode to obtain nanosecond rotational correlation time images. To develop the method, well-characterized domain-containing models consisting of giant unilamellar vesicles comprising mixtures of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, sphingomyelin and cholesterol were used with the fluorophores diphenylhexatriene, 1-palmitoyl-2-{6-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]hexanoyl}-sn-glycero-3-phosphocholine and 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine-N-(7-nitro-2-1,3-benzoxadiazol-4-yl). Accordingly, images of rotational correlation times of the probes revealed domain structures for all three probes consistent with other studies using different approaches. Rotational correlation time images of living cell membranes were also observed. The method has the advantage that not only does it enable domains to be visualised or imaged in a unique manner but that it can also potentially provide useful information on the lipid dynamics within the structures.
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Affiliation(s)
- Stanley W Botchway
- Lasers for Science, Central Laser Facility, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot OX110QX, UK
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26
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Stöckl M, Herrmann A. Detection of lipid domains in model and cell membranes by fluorescence lifetime imaging microscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1798:1444-56. [DOI: 10.1016/j.bbamem.2009.12.015] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Revised: 11/30/2009] [Accepted: 12/21/2009] [Indexed: 01/17/2023]
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27
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Navarro JRG, Plugge M, Loumaigne M, Sanchez-Gonzalez A, Mennucci B, Débarre A, Brouwer AM, Werts MHV. Probing the interactions between disulfide-based ligands and gold nanoparticles using a functionalised fluorescent perylene-monoimide dye. Photochem Photobiol Sci 2010; 9:1042-54. [PMID: 20514373 DOI: 10.1039/c0pp00063a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The binding of disulfides to gold nanoparticles was investigated using fluorescence spectroscopy and a perylene-monoimide dye coupled to a dissymmetric disulfide via a tetraethyleneglycolalkyl chain (PMImSS). Quantum chemical calculations using the polarizable continuum model (PCM) predict a strong quenching of perylene-monoimide fluorescence by gold nanoparticles as a result of efficient excitation energy transfer from the dye to the particle. Such quenching is indeed observed when unfunctionalised gold nanoparticles are added to a solution of PMImSS. The fluorimetric titration curves show behaviour indicative of the existence of an equilibrium between free and bound ligands (association constant 5 x 10(5) M(-1)), whereas the affinity of thiols and disulfide for gold surfaces is in general assumed to be much higher. Gold nanoparticles fully functionalised with PMImSS were synthesised and purified. Fluorescence correlation spectroscopy shows the appearance of free PMImSS ligands in dilute (approx. pM) suspensions of these PMImSS-functionalised nanoparticles over a period of several days.
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Affiliation(s)
- Julien R G Navarro
- Ecole Normale Supérieure de Cachan/Bretagne, Laboratoire SATIE (UMR 8029), Campus de Ker Lann, F-35170 Bruz, France
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28
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Affiliation(s)
- Mikhail Y. Berezin
- Department of Radiology, Washington University School of Medicine, 4525 Scott Ave, St. Louis, USA, Tel. 314-747-0701, 314-362-8599, fax 314-747-5191
| | - Samuel Achilefu
- Department of Radiology, Washington University School of Medicine, 4525 Scott Ave, St. Louis, USA, Tel. 314-747-0701, 314-362-8599, fax 314-747-5191
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29
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Antoku Y, Hotta JI, Mizuno H, Dickson RM, Hofkens J, Vosch T. Transfection of living HeLa cells with fluorescent poly-cytosine encapsulated Ag nanoclusters. Photochem Photobiol Sci 2010; 9:716-21. [PMID: 20442932 PMCID: PMC2913586 DOI: 10.1039/c0pp00015a] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 03/05/2010] [Indexed: 11/21/2022]
Abstract
The fluorescence of silver clusters encapsulated by single stranded oligo-DNA (24 cytosine base pairs, C(24):Ag(n)) was used to monitor the transfection of this new silver/DNA fluorophore inside living HeLa cells. For this, the C(24):Ag(n) molecules were complexed with a commercially available transfection reagent Lipofectamine and the internalization of C(24):Ag(n) was followed with confocal fluorescence microscopy. Bright near-infrared fluorescence was observed from inside the transfected HeLa cells, when exciting with 633 nm excitation, opening up the possibility for the use of these C(24):Ag(n) clusters for biological labelling and imaging of living cells and for monitoring the transfection process with limited harm to the living cells.
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Affiliation(s)
- Yasuko Antoku
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
| | - Jun-ichi Hotta
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
| | - Hideaki Mizuno
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
| | - Robert M. Dickson
- School of Chemistry and Biochemistry and Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 901 Atlantic Drive, Atlanta, GA, 30332-0400, USA
| | - Johan Hofkens
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
| | - Tom Vosch
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001, Heverlee, Belgium
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30
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Membrane lipid domains and rafts: current applications of fluorescence lifetime spectroscopy and imaging. Chem Phys Lipids 2009; 157:61-77. [DOI: 10.1016/j.chemphyslip.2008.07.011] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Accepted: 07/24/2008] [Indexed: 11/30/2022]
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31
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Zarubica A, Plazzo AP, Stöckl M, Trombik T, Hamon Y, Müller P, Pomorski T, Herrmann A, Chimini G. Functional implications of the influence of ABCA1 on lipid microenvironment at the plasma membrane: a biophysical study. FASEB J 2009; 23:1775-85. [PMID: 19151332 DOI: 10.1096/fj.08-122192] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The ABCA1 transporter orchestrates cellular lipid homeostasis by promoting the release of cholesterol to plasmatic acceptors. The molecular mechanism is, however, unknown. We report here on the biophysical analysis in living HeLa cells of the ABCA1 lipid microenvironment at the plasma membrane. The modifications of membrane attributes induced by ABCA1 were assessed at both the outer and inner leaflet by monitoring either the lifetime of membrane inserted fluorescent lipid analogues by fluorescence lifetime imaging microscopy (FLIM) or, respectively, the membrane translocation of cationic sensors. Analysis of the partitioning of dedicated probes in plasma membrane blebs vesiculated from these cells allowed visualization of ABCA1 partitioning into the liquid disordered-like phase and corroborated the idea that ABCA1 destabilizes the lipid arrangement at the membrane. Specificity was demonstrated by comparison with cells expressing an inactive transporter. The physiological relevance of these modifications was finally demonstrated by the reduced membrane mobility and function of transferrin receptors under the influence of an active ABCA1. Collectively, these data assess that the control of both transversal and lateral lipid distribution at the membrane is the primary function of ABCA1 and positions the effluxes of cholesterol from cell membranes downstream to the redistribution of the sterol into readily extractable membrane pools.
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Affiliation(s)
- Ana Zarubica
- Centre d'Immunologie de Marseille Luminy, Institut National de la Santè et de la Recherche Médicale, Centre National de la Recherche Scientifique, Université de la Méditerranée, Parc Scientifique de Luminy case 906, 13288 Marseille, Cedex 09 France
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32
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Combining fluorescence lifetime and polarization microscopy to discriminate phase separated domains in giant unilamellar vesicles. Biophys J 2008; 95:5737-47. [PMID: 18790852 DOI: 10.1529/biophysj.108.131490] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Using fluorescence lifetime microscopy we study the structure of lipid domains in giant unilamellar vesicles made from sphingomyelin, 1,2-dioleoyl-sn-glycero-3-phosphocholine, and cholesterol. Lifetimes and orientation of a derivative of the fluorescent probe DPH embedded in the membrane were measured for binary and ternary lipid mixtures incorporating up to 42 mol % of cholesterol. The results show that adding cholesterol always increases the lifetime of the probe studied. In addition, the analysis of the probe orientation indicates that cholesterol has little influence on the ordering of the sphingomyelin alkyl chains whereas it has a noticeable effect on the structure of the 1,2-dioleoyl-sn-glycero-3-phosphocholine chains. The measurements made on the orientation and lifetime of the probe show the structure of the membrane in its liquid ordered and liquid disordered domains.
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33
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Stöckl M, Plazzo AP, Korte T, Herrmann A. Detection of lipid domains in model and cell membranes by fluorescence lifetime imaging microscopy of fluorescent lipid analogues. J Biol Chem 2008; 283:30828-37. [PMID: 18708353 DOI: 10.1074/jbc.m801418200] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The presence of lipid domains in cellular membranes and their characteristic features are still an issue of dividing discussion. Several recent studies implicate lipid domains in plasma membranes of mammalian cells as short lived and in the submicron range. Measuring the fluorescence lifetime of appropriate lipid analogues is a proper approach to detect domains with such properties. Here, the sensitivity of the fluorescence lifetime of1-palmitoyl-2-[6-[(7-nitro-2-1,3-benzoxadiazol-4-yl)amino]-hexanoyl]-sn-glycero-3-phospholipid (C6-NBD-phospholipid) analogues has been employed to characterize lipid domains in giant unilamellar vesicles (GUVs) and the plasma membrane of mammalian cells by fluorescence lifetime imaging (FLIM). Fluorescence decay of C6-NBD-phosphatidylcholine is characterized by a short and long lifetime. For GUVs forming microscopically visible lipid domains the longer lifetime in the liquid disordered (ld) and the liquid ordered (lo) phase was clearly distinct, being approximately 7 ns and 11 ns, respectively. Lifetimes were not sensitive to variation of cholesterol concentration of domain-forming GUVs indicating that the lipid composition and physical properties of those lipid domains are well defined entities. Even the existence of submicroscopic domains can be detected by FLIM as demonstrated for GUVs of palmitoyloleoyl phosphatidylcholine/N-palmitoyl-d-sphingomyelin/cholesterol mixtures. A broad distribution of the long lifetime was found for C6-NBD-phosphatidylcholine inserted in the plasma membrane of HepG2 and HeLa cells centered around 11 ns. FLIM studies on lipid domains forming giant vesicles derived from the plasma membrane of HeLa cells may suggest that a variety of submicroscopic lipid domains exists in the plasma membrane of intact cells.
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Affiliation(s)
- Martin Stöckl
- Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, Institut für Biologie/Biophysik, Invalidenstrasse 42, Berlin D-10115, Germany
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Yan P, Xie A, Wei M, Loew LM. Amino(oligo)thiophene-based environmentally sensitive biomembrane chromophores. J Org Chem 2008; 73:6587-94. [PMID: 18665648 DOI: 10.1021/jo800852h] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
There is a growing need for cellular imaging with fluorescent probes that emit at longer wavelengths to minimize the effects of absorption, autofluorescence, and scattering from biological tissue. In this paper a series of new environmentally sensitive hemicyanine dyes featuring amino(oligo)thiophene donors have been synthesized via aldol condensation between a 4-methylpyridinium salt and various amino(oligo)thiophene carboxaldehydes, which were, in turn, obtained from amination of bromo(oligo)thiophene carboxaldehyde. Side chains on these fluorophores impart a strong affinity for biological membranes. Compared with benzene analogues, these thiophene fluorophores show significant red shift in the absorption and emission spectra, offering compact red and near-infrared emitting fluorophores. More importantly, both the fluorescence quantum yields and the emission peaks are very sensitive to various environmental factors such as solvent polarity or viscosity, membrane potential, and membrane composition. These chromophores also exhibit strong nonlinear optical properties, including two-photon fluorescence and second harmonic generation, which are themselves environmentally sensitive. The combination of long wavelength fluorescence and nonlinear optical properties make these chromophores very suitable for applications that require sensing or imaging deep inside tissues.
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Affiliation(s)
- Ping Yan
- Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, Connecticut 06030, USA
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35
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Lowry M, Fakayode SO, Geng ML, Baker GA, Wang L, McCarroll ME, Patonay G, Warner IM. Molecular Fluorescence, Phosphorescence, and Chemiluminescence Spectrometry. Anal Chem 2008; 80:4551-74. [DOI: 10.1021/ac800749v] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Mark Lowry
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Sayo O. Fakayode
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Maxwell L. Geng
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Gary A. Baker
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Lin Wang
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Matthew E. McCarroll
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Gabor Patonay
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
| | - Isiah M. Warner
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110, Department of Chemistry, Nanoscience and Nanotechnology Institute and the Optical Science and Technology Center, University of Iowa, Iowa City, Iowa 52242, Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale,
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Johnny S, Liana, C. S, Anthony, H. F. Ceramide-containing membranes: the interface between biophysics and biology. TRENDS GLYCOSCI GLYC 2008. [DOI: 10.4052/tigg.20.297] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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