151
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Apoptosis and eryptosis: Striking differences on biomembrane level. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1362-1371. [DOI: 10.1016/j.bbamem.2018.03.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 03/19/2018] [Accepted: 03/20/2018] [Indexed: 01/09/2023]
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152
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Bai Y, Shi X, Chen Y, Zhu C, Jiao Y, Han Z, He W, Guo Z. Coumarin/BODIPY Hybridisation for Ratiometric Sensing of Intracellular Polarity Oscillation. Chemistry 2018; 24:7513-7524. [DOI: 10.1002/chem.201800915] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Indexed: 12/18/2022]
Affiliation(s)
- Yang Bai
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Xiangchao Shi
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Yuncong Chen
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Chengcheng Zhu
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Yang Jiao
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Zhong Han
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Weijiang He
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
| | - Zijian Guo
- State Key Laboratory of Coordination ChemistryCoordination Chemistry InstituteSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210023 P.R. China
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153
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Pogmore AR, Seistrup KH, Strahl H. The Gram-positive model organism Bacillus subtilis does not form microscopically detectable cardiolipin-specific lipid domains. MICROBIOLOGY-SGM 2018; 164:475-482. [PMID: 29504925 DOI: 10.1099/mic.0.000639] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Rather than being homogenous diffusion-dominated structures, biological membranes can exhibit areas with distinct composition and characteristics, commonly termed as lipid domains. Arguably the most comprehensively studied examples in bacteria are domains formed by cardiolipin, which have been functionally linked to protein targeting, the cell division process and the mode of action of membrane-targeting antimicrobials. Cardiolipin domains were originally identified in the Gram-negative model organism Escherichia coli based on preferential staining by the fluorescent membrane dye nonylacridine orange (NAO), and later reported to also exist in other Gram-negative and -positive bacteria. Recently, the lipid-specificity of NAO has been questioned based on studies conducted in E. coli. This prompted us to reanalyse cardiolipin domains in the Gram-positive model organism Bacillus subtilis. Here we show that logarithmically growing B. subtilis does not form microscopically detectable cardiolipin-specific lipid domains, and that NAO is not a specific stain for cardiolipin in this organism.
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Affiliation(s)
- Alex-Rose Pogmore
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
| | - Kenneth H Seistrup
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
| | - Henrik Strahl
- Centre for Bacterial Cell Biology, Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, UK
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154
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Lin Y, Bogdanov M, Lu S, Guan Z, Margolin W, Weiss J, Zheng L. The phospholipid-repair system LplT/Aas in Gram-negative bacteria protects the bacterial membrane envelope from host phospholipase A 2 attack. J Biol Chem 2018; 293:3386-3398. [PMID: 29348168 PMCID: PMC5836115 DOI: 10.1074/jbc.ra117.001231] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 01/15/2018] [Indexed: 11/06/2022] Open
Abstract
Secretory phospholipases A2 (sPLA2s) are potent components of mammalian innate-immunity antibacterial mechanisms. sPLA2 enzymes attack bacteria by hydrolyzing bacterial membrane phospholipids, causing membrane disorganization and cell lysis. However, most Gram-negative bacteria are naturally resistant to sPLA2 Here we report a novel resistance mechanism to mammalian sPLA2 in Escherichia coli, mediated by a phospholipid repair system consisting of the lysophospholipid transporter LplT and the acyltransferase Aas in the cytoplasmic membrane. Mutation of the lplT or aas gene abolished bacterial lysophospholipid acylation activity and drastically increased bacterial susceptibility to the combined actions of inflammatory fluid components and sPLA2, resulting in bulk phospholipid degradation and loss of colony-forming ability. sPLA2-mediated hydrolysis of the three major bacterial phospholipids exhibited distinctive kinetics and deacylation of cardiolipin to its monoacyl-derivative closely paralleled bacterial death. Characterization of the membrane envelope in lplT- or aas-knockout mutant bacteria revealed reduced membrane packing and disruption of lipid asymmetry with more phosphatidylethanolamine present in the outer leaflet of the outer membrane. Moreover, modest accumulation of lysophospholipids in these mutant bacteria destabilized the inner membrane and rendered outer membrane-depleted spheroplasts much more sensitive to sPLA2 These findings indicated that LplT/Aas inactivation perturbs both the outer and inner membranes by bypassing bacterial membrane maintenance mechanisms to trigger specific interfacial activation of sPLA2 We conclude that the LplT/Aas system is important for maintaining the integrity of the membrane envelope in Gram-negative bacteria. Our insights may help inform new therapeutic strategies to enhance host sPLA2 antimicrobial activity.
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Affiliation(s)
- Yibin Lin
- From the Center for Membrane Biology, Department of Biochemistry and Molecular Biology and
| | | | - Shuo Lu
- From the Center for Membrane Biology, Department of Biochemistry and Molecular Biology and
| | - Ziqiang Guan
- the Department of Biochemistry, Duke University School of Medicine, Durham, North Carolina 27710, and
| | - William Margolin
- Microbiology and Molecular Genetics, University of Texas McGovern Medical School, Houston, Texas 77030
| | - Jerrold Weiss
- the Inflammation Program and Departments of Internal Medicine and Microbiology, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242
| | - Lei Zheng
- From the Center for Membrane Biology, Department of Biochemistry and Molecular Biology and
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155
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Saeloh D, Tipmanee V, Jim KK, Dekker MP, Bitter W, Voravuthikunchai SP, Wenzel M, Hamoen LW. The novel antibiotic rhodomyrtone traps membrane proteins in vesicles with increased fluidity. PLoS Pathog 2018; 14:e1006876. [PMID: 29451901 PMCID: PMC5833292 DOI: 10.1371/journal.ppat.1006876] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Revised: 03/01/2018] [Accepted: 01/12/2018] [Indexed: 12/11/2022] Open
Abstract
The acylphloroglucinol rhodomyrtone is a promising new antibiotic isolated from the rose myrtle Rhodomyrtus tomentosa, a plant used in Asian traditional medicine. While many studies have demonstrated its antibacterial potential in a variety of clinical applications, very little is known about the mechanism of action of rhodomyrtone. Preceding studies have been focused on intracellular targets, but no specific intracellular protein could be confirmed as main target. Using live cell, high-resolution, and electron microscopy we demonstrate that rhodomyrtone causes large membrane invaginations with a dramatic increase in fluidity, which attract a broad range of membrane proteins. Invaginations then form intracellular vesicles, thereby trapping these proteins. Aberrant protein localization impairs several cellular functions, including the respiratory chain and the ATP synthase complex. Being uncharged and devoid of a particular amphipathic structure, rhodomyrtone did not seem to be a typical membrane-inserting molecule. In fact, molecular dynamics simulations showed that instead of inserting into the bilayer, rhodomyrtone transiently binds to phospholipid head groups and causes distortion of lipid packing, providing explanations for membrane fluidization and induction of membrane curvature. Both its transient binding mode and its ability to form protein-trapping membrane vesicles are unique, making it an attractive new antibiotic candidate with a novel mechanism of action. Bacterial antibiotic resistance constitutes a major public healthcare issue and deaths caused by antimicrobial resistance are expected to soon exceed the number of cancer-related fatalities. In order to fight resistance, new antibiotics have to be developed that are not affected by existing microbial resistance strategies. Thus, antibiotics with novel or multiple targets are urgently needed. Rhodomyrtone displays excellent antibacterial activity, has been safely used in traditional Asian medicine for a long time, and resistance against this promising antibiotic candidate could not be detected in multiple passaging experiments. Here we demonstrate that rhodomyrtone possesses a completely novel mechanism of action, which is opposed to that of existing cell envelope-targeting drugs, minimizing the risk of cross-resistance, and in fact rhodomyrtone is highly active against e.g. vancomycin-resistant Staphylococcus aureus. Thus, rhodomyrtone is an extremely interesting compound for further antibacterial drug development.
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Affiliation(s)
- Dennapa Saeloh
- Excellence Research Laboratory on Natural Products, Faculty of Science and Natural Product Research Center of Excellence, Prince of Songkla University, Hat Yai, Songkhla, Thailand
- Department of Microbiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Varomyalin Tipmanee
- Department of Biomedical Sciences, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Kin Ki Jim
- Department of Medical Microbiology and Infection Control, VU University Medical Center, Amsterdam, The Netherlands
| | - Marien P. Dekker
- Department of Clinical Genetics, Center for Neurogenomics and Cognitive Research (CNCR), Neuroscience Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - Wilbert Bitter
- Department of Medical Microbiology and Infection Control, VU University Medical Center, Amsterdam, The Netherlands
- Department of Molecular Cell Biology, Amsterdam Institute for Molecules, Medicines and Systems, Faculty of Science, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Supayang P. Voravuthikunchai
- Excellence Research Laboratory on Natural Products, Faculty of Science and Natural Product Research Center of Excellence, Prince of Songkla University, Hat Yai, Songkhla, Thailand
- Department of Microbiology, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Michaela Wenzel
- Department of Medical Microbiology and Infection Control, VU University Medical Center, Amsterdam, The Netherlands
- Bacterial Cell Biology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands
- * E-mail: (MW); (LWH)
| | - Leendert W. Hamoen
- Bacterial Cell Biology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands
- * E-mail: (MW); (LWH)
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156
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Halder A, Saha B, Maity P, Kumar GS, Sinha DK, Karmakar S. Lipid chain saturation and the cholesterol in the phospholipid membrane affect the spectroscopic properties of lipophilic dye nile red. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 191:104-110. [PMID: 28992460 DOI: 10.1016/j.saa.2017.10.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/18/2017] [Accepted: 10/01/2017] [Indexed: 05/24/2023]
Abstract
We have studied the effect of composition and the phase state of phospholipid membranes on the emission spectrum, anisotropy and lifetime of a lipophilic fluorescence probe nile red. Fluorescence spectrum of nile red in membranes containing cholesterol has also been investigated in order to get insights into the influence of cholesterol on the phospholipid membranes. Maximum emission wavelength (λem) of nile red in the fluid phase of saturated and unsaturated phospholipids was found to differ by ~10nm. The λem was also found to be independent of chain length and charge of the membrane. However, the λem is strongly dependent on the temperature in the gel phase. The λem and rotational diffusion rate decrease, whereas the anisotropy and lifetime increase markedly with increasing cholesterol concentration for saturated phosoholipids, such as, dimyristoyl phosphatidylcholine (DMPC) in the liquid ordered phase. However, these spectroscopic properties do not alter significantly in case of unsaturated phospholipids, such as, dioleoyl phosphatidylcholine (DOPC) in liquid disordered phase. Interestingly, red edge excitation shift (REES) in the presence of lipid-cholesterol membranes is the direct consequences of change in rotational diffusion due to motional restriction of lipids in the presence of cholesterol. This study provides correlations between the membrane compositions and fluorescence spectral features which can be utilized in a wide range of biophysical fields as well the cell biology.
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Affiliation(s)
- Animesh Halder
- Department of Physics, Jadavpur University, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Baishakhi Saha
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian, Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700 032, India
| | - Pabitra Maity
- Department of Physics, Jadavpur University, Raja S. C. Mullick Road, Kolkata 700032, India
| | - Gopinatha Suresh Kumar
- Biophysical Chemistry Laboratory, Organic and Medicinal Chemistry Division, CSIR-Indian, Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata 700 032, India
| | - Deepak Kumar Sinha
- Department of Biological Chemistry, Indian Association for Cultivation of Sciences, Raja.S. C. Mullick Road, Kolkata - 700 032, India
| | - Sanat Karmakar
- Department of Physics, Jadavpur University, Raja S. C. Mullick Road, Kolkata 700032, India.
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157
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Sameni S, Malacrida L, Tan Z, Digman MA. Alteration in Fluidity of Cell Plasma Membrane in Huntington Disease Revealed by Spectral Phasor Analysis. Sci Rep 2018; 8:734. [PMID: 29335600 PMCID: PMC5768877 DOI: 10.1038/s41598-018-19160-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 12/22/2017] [Indexed: 12/18/2022] Open
Abstract
Huntington disease (HD) is a late-onset genetic neurodegenerative disorder caused by expansion of cytosine-adenine-guanine (CAG) trinucleotide in the exon 1 of the gene encoding the polyglutamine (polyQ). It has been shown that protein degradation and lipid metabolism is altered in HD. In many neurodegenerative disorders, impaired lipid homeostasis is one of the early events in the disease onset. Yet, little is known about how mutant huntingtin may affect phospholipids membrane fluidity. Here, we investigated how membrane fluidity in the living cells (differentiated PC12 and HEK293 cell lines) are affected using a hyperspectral imaging of widely used probes, LAURDAN. Using phasor approach, we characterized the fluorescence of LAURDAN that is sensitive to the polarity of the immediate environment. LAURDAN is affected by the physical order of phospholipids (lipid order) and reports the membrane fluidity. We also validated our results using a different fluorescent membrane probe, Nile Red (NR). The plasma membrane in the cells expressing expanded polyQ shows a shift toward increased membrane fluidity revealed by both LAURDAN and NR spectral phasors. This finding brings a new perspective in the understanding of the early stages of HD that can be used as a target for drug screening.
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Affiliation(s)
- Sara Sameni
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, CA, USA
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Leonel Malacrida
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, CA, USA
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
- Departamento de Fisiopatología, Hospital de Clinicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Zhiqun Tan
- Institute for Memory Impairments and Neurological Disorders, University of California Irvine, Irvine, USA
| | - Michelle A Digman
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, CA, USA.
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA.
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158
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Seki H, Onishi S, Asamura N, Suzuki Y, Kawamata J, Kaneno D, Hadano S, Watanabe S, Niko Y. Bright and two-photon active red fluorescent dyes that selectively move back and forth between the mitochondria and nucleus upon changing the mitochondrial membrane potential. J Mater Chem B 2018; 6:7396-7401. [DOI: 10.1039/c8tb02415d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Pyrene-based two-photon active and bright red emitters that localize between the mitochondria and nucleus in response to changes in the mitochondrial membrane potential.
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Affiliation(s)
- Hitomi Seki
- Research and Education Faculty
- Multidisciplinary Science Cluster
- Interdisciplinary Science Unit
- Kochi University
- Kochi
| | - Shozo Onishi
- Graduate School of Medicine
- Yamaguchi University
- Yoshida
- Japan
| | - Naoya Asamura
- Graduate School of Medicine
- Yamaguchi University
- Yoshida
- Japan
| | | | - Jun Kawamata
- Graduate School of Medicine
- Yamaguchi University
- Yoshida
- Japan
| | - Daisuke Kaneno
- Department of Applied Science
- Graduate School of Integrated Arts and Sciences
- Kochi University
- Nankoku City
- Japan
| | - Shingo Hadano
- Research and Education Faculty
- Multidisciplinary Science Cluster
- Interdisciplinary Science Unit
- Kochi University
- Kochi
| | - Shigeru Watanabe
- Research and Education Faculty
- Multidisciplinary Science Cluster
- Interdisciplinary Science Unit
- Kochi University
- Kochi
| | - Yosuke Niko
- Research and Education Faculty
- Multidisciplinary Science Cluster
- Interdisciplinary Science Unit
- Kochi University
- Kochi
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159
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Licari G, Beckwith JS, Soleimanpour S, Matile S, Vauthey E. Detecting order and lateral pressure at biomimetic interfaces using a mechanosensitive second-harmonic-generation probe. Phys Chem Chem Phys 2018; 20:9328-9336. [DOI: 10.1039/c8cp00773j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A mechanosensitive harmonophore is used to probe the order and lateral pressure in phospholipid monolayers by surface-second harmonic generation.
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Affiliation(s)
- Giuseppe Licari
- Department of Physical Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Joseph S. Beckwith
- Department of Physical Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Saeideh Soleimanpour
- Department of Organic Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Stefan Matile
- Department of Organic Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
| | - Eric Vauthey
- Department of Physical Chemistry, University of Geneva
- CH-1211 Geneva 4
- Switzerland
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160
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Abstract
Researchers striving to convert biology into an exact science foremost rely on structural biology and biochemical reconstitution approaches to obtain quantitative data. However, cell biological research is moving at an ever-accelerating speed into areas where these approaches lose much of their edge. Intrinsically unstructured proteins and biochemical interaction networks composed of interchangeable, multivalent, and unspecific interactions pose unique challenges to quantitative biology, as do processes that occur in discrete cellular microenvironments. Here we argue that a conceptual change in our way of conducting biochemical experiments is required to take on these new challenges. We propose that reconstitution of cellular processes in vitro should be much more focused on mimicking the cellular environment in vivo, an approach that requires detailed knowledge of the material properties of cellular compartments, essentially requiring a material science of the cell. In a similar vein, we suggest that quantitative biochemical experiments in vitro should be accompanied by corresponding experiments in vivo, as many newly relevant cellular processes are highly context-dependent. In essence, this constitutes a call for chemical biologists to convert their discipline from a proof-of-principle science to an area that could rightfully be called quantitative biochemistry in living cells. In this essay, we discuss novel techniques and experimental strategies with regard to their potential to fulfill such ambitious aims.
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Affiliation(s)
- Alf Honigmann
- Max Planck Institute of Molecular Cell Biology and Genetics , Pfotenhauerstraße 108, 01307 Dresden, Germany
| | - André Nadler
- Max Planck Institute of Molecular Cell Biology and Genetics , Pfotenhauerstraße 108, 01307 Dresden, Germany
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161
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Shaya J, Collot M, Bénailly F, Mahmoud N, Mély Y, Michel BY, Klymchenko AS, Burger A. Turn-on Fluorene Push-Pull Probes with High Brightness and Photostability for Visualizing Lipid Order in Biomembranes. ACS Chem Biol 2017; 12:3022-3030. [PMID: 29053920 DOI: 10.1021/acschembio.7b00658] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The rational design of environmentally sensitive dyes with superior properties is critical for elucidating the fundamental biological processes and understanding the biophysical behavior of cell membranes. In this study, a novel group of fluorene-based push-pull probes was developed for imaging membrane lipids. The design of these fluorogenic conjugates is based on a propioloyl linker to preserve the required spectroscopic features of the core dye. This versatile linker allowed the introduction of a polar deoxyribosyl head, a lipophilic chain, and an amphiphilic/anchoring group to tune the cell membrane binding and internalization. It was found that the deoxyribosyl head favored cell internalization and staining of intracellular membranes, whereas an amphiphilic anchor group ensured specific plasma membrane staining. The optimized fluorene probes presented a set of improvements as compared to commonly used environmentally sensitive membrane probe Laurdan such as red-shifted absorption matching the 405 nm diode laser excitation, a blue-green emission range complementary to the red fluorescent proteins, enhanced brightness and photostability, as well as preserved sensitivity to lipid order, as shown in model membranes and living cells.
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Affiliation(s)
- Janah Shaya
- Université Côte d’Azur, CNRS, Institut de Chimie de Nice, UMR 7272 − Parc Valrose, 06108 Nice cedex 2, France
| | - Mayeul Collot
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213, Faculté de Pharmacie, Université de Strasbourg, CNRS, 74 Route du Rhin, 67401 Illkirch, France
| | - Frédéric Bénailly
- Université Côte d’Azur, CNRS, Institut de Chimie de Nice, UMR 7272 − Parc Valrose, 06108 Nice cedex 2, France
| | - Najiba Mahmoud
- Université Côte d’Azur, CNRS, Institut de Chimie de Nice, UMR 7272 − Parc Valrose, 06108 Nice cedex 2, France
| | - Yves Mély
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213, Faculté de Pharmacie, Université de Strasbourg, CNRS, 74 Route du Rhin, 67401 Illkirch, France
| | - Benoît Y. Michel
- Université Côte d’Azur, CNRS, Institut de Chimie de Nice, UMR 7272 − Parc Valrose, 06108 Nice cedex 2, France
| | - Andrey S. Klymchenko
- Laboratoire
de Biophotonique et Pharmacologie, UMR 7213, Faculté de Pharmacie, Université de Strasbourg, CNRS, 74 Route du Rhin, 67401 Illkirch, France
| | - Alain Burger
- Université Côte d’Azur, CNRS, Institut de Chimie de Nice, UMR 7272 − Parc Valrose, 06108 Nice cedex 2, France
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162
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Jena P, Roxbury D, Galassi TV, Akkari L, Horoszko CP, Iaea DB, Budhathoki-Uprety J, Pipalia N, Haka AS, Harvey JD, Mittal J, Maxfield FR, Joyce JA, Heller DA. A Carbon Nanotube Optical Reporter Maps Endolysosomal Lipid Flux. ACS NANO 2017; 11:10689-10703. [PMID: 28898055 PMCID: PMC5707631 DOI: 10.1021/acsnano.7b04743] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Accepted: 08/31/2017] [Indexed: 05/18/2023]
Abstract
Lipid accumulation within the lumen of endolysosomal vesicles is observed in various pathologies including atherosclerosis, liver disease, neurological disorders, lysosomal storage disorders, and cancer. Current methods cannot measure lipid flux specifically within the lysosomal lumen of live cells. We developed an optical reporter, composed of a photoluminescent carbon nanotube of a single chirality, that responds to lipid accumulation via modulation of the nanotube's optical band gap. The engineered nanomaterial, composed of short, single-stranded DNA and a single nanotube chirality, localizes exclusively to the lumen of endolysosomal organelles without adversely affecting cell viability or proliferation or organelle morphology, integrity, or function. The emission wavelength of the reporter can be spatially resolved from within the endolysosomal lumen to generate quantitative maps of lipid content in live cells. Endolysosomal lipid accumulation in cell lines, an example of drug-induced phospholipidosis, was observed for multiple drugs in macrophages, and measurements of patient-derived Niemann-Pick type C fibroblasts identified lipid accumulation and phenotypic reversal of this lysosomal storage disease. Single-cell measurements using the reporter discerned subcellular differences in equilibrium lipid content, illuminating significant intracellular heterogeneity among endolysosomal organelles of differentiating bone-marrow-derived monocytes. Single-cell kinetics of lipoprotein-derived cholesterol accumulation within macrophages revealed rates that differed among cells by an order of magnitude. This carbon nanotube optical reporter of endolysosomal lipid content in live cells confers additional capabilities for drug development processes and the investigation of lipid-linked diseases.
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Affiliation(s)
- Prakrit
V. Jena
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
| | - Daniel Roxbury
- Department
of Chemical Engineering, University of Rhode
Island, Kingston, Rhode Island 02881, United States
| | - Thomas V. Galassi
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
- Weill
Cornell Medicine, New York, New York 10065, United States
| | - Leila Akkari
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
- Division
of Tumor Biology & Immunology, The Netherlands
Cancer Institute, Amsterdam 1066 CX, The Netherlands
| | - Christopher P. Horoszko
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
- Weill
Cornell Medicine, New York, New York 10065, United States
| | - David B. Iaea
- Weill
Cornell Medicine, New York, New York 10065, United States
| | | | - Nina Pipalia
- Weill
Cornell Medicine, New York, New York 10065, United States
| | - Abigail S. Haka
- Weill
Cornell Medicine, New York, New York 10065, United States
| | - Jackson D. Harvey
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
- Weill
Cornell Medicine, New York, New York 10065, United States
| | - Jeetain Mittal
- Department
of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | | | - Johanna A. Joyce
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
- Weill
Cornell Medicine, New York, New York 10065, United States
- Ludwig Center
for Cancer Research, University of Lausanne, Lausanne CH 1066, Switzerland
| | - Daniel A. Heller
- Memorial
Sloan Kettering Cancer Center, New York, New York 10065, United States
- Weill
Cornell Medicine, New York, New York 10065, United States
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163
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Membrane order in the plasma membrane and endocytic recycling compartment. PLoS One 2017; 12:e0188041. [PMID: 29125865 PMCID: PMC5681288 DOI: 10.1371/journal.pone.0188041] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 10/31/2017] [Indexed: 12/30/2022] Open
Abstract
The cholesterol content of membranes plays an important role in organizing membranes for signal transduction and protein trafficking as well as in modulating the biophysical properties of membranes. While the properties of model or isolated membranes have been extensively studied, there has been little evaluation of internal membranes in living cells. Here, we use a Nile Red based probe, NR12S, and ratiometric live cell imaging, to analyze the membrane order of the plasma membrane and endocytic recycling compartment. We find that after a brief incubation to allow endocytosis, NR12S is distributed between the plasma membrane and the endocytic recycling compartment. The NR12S reports that the endocytic recycling compartment is more highly ordered than the plasma membrane. We also find that the plasma membrane and the endocytic recycling compartment are differentially affected by altering cellular cholesterol levels. The membrane order of the plasma membrane, but not the endocytic recycling compartment, is altered significantly when cellular cholesterol content is increased or decreased by 20%. These results demonstrate that changes in cellular cholesterol differentially alter membrane order within different organelles.
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164
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Sena F, Sotelo-Silveira M, Astrada S, Botella MA, Malacrida L, Borsani O. Spectral phasor analysis reveals altered membrane order and function of root hair cells in Arabidopsis dry2/sqe1-5 drought hypersensitive mutant. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2017; 119:224-231. [PMID: 28910707 DOI: 10.1016/j.plaphy.2017.08.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/21/2017] [Accepted: 08/21/2017] [Indexed: 06/07/2023]
Abstract
Biological membranes allow the regulation of numerous cellular processes, which are affected when unfavorable environmental factors are perceived. Lipids and proteins are the principal components of biological membranes. Each lipid has unique biophysical properties, and, therefore the lipid composition of the membrane is critical to maintaining the bilayer structure and functionality. Membrane composition and integrity are becoming the focus of studies aiming to understand how plants adapt to its environment. In this study, using a combination of di-4-ANEPPDHQ fluorescence and spectral phasor analysis, we report that the drought hypersensitive/squalene epoxidase (dry2/sqe1-5) mutant with reduced major sterols such as sitosterol and stigmasterol in roots presented higher membrane fluidity than the wild type. Moreover, analysis of endomembrane dynamics showed that vesicle formation was affected in dry2/sqe1-5. Further analysis of proteins associated with sterol rich micro domains showed that dry2/sqe1-5 presented micro domains function altered.
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Affiliation(s)
- Florencia Sena
- Departamento de Biología Vegetal, Laboratorio de Bioquímica, Facultad de Agronomía, Montevideo, Uruguay
| | - Mariana Sotelo-Silveira
- Departamento de Biología Vegetal, Laboratorio de Bioquímica, Facultad de Agronomía, Montevideo, Uruguay.
| | | | - Miguel A Botella
- Instituto de Hortofruticultura Subtropical y Mediterránea, Universidad de Málaga-Consejo Superior de Investigaciones Científicas, Departamento de Biología Molecular y Bioquímica, Facultad de Ciencias, Universidad de Málaga, 29071 Malaga, Spain
| | - Leonel Malacrida
- Departamento de Fisiopatología, Hospital de Clínicas, Universidad de la Republica, Montevideo-Uruguay, Analytical Biochemistry and Proteomics Unit, Institut Pasteur of Montevideo, Uruguay
| | - Omar Borsani
- Departamento de Biología Vegetal, Laboratorio de Bioquímica, Facultad de Agronomía, Montevideo, Uruguay
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165
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The bacterial Sec system is required for the organization and function of the MreB cytoskeleton. PLoS Genet 2017; 13:e1007017. [PMID: 28945742 PMCID: PMC5629013 DOI: 10.1371/journal.pgen.1007017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 10/05/2017] [Accepted: 09/13/2017] [Indexed: 12/11/2022] Open
Abstract
The Sec system is responsible for protein insertion, translocation and secretion across membranes in all cells. The bacterial actin homolog MreB controls various processes, including cell wall synthesis, membrane organization and polarity establishment. Here we show that the two systems genetically interact and that components of the Sec system, especially the SecA motor protein, are essential for spatiotemporal organization of MreB in E. coli, as evidenced by the accumulation of MreB at irregular sites in Sec-impaired cells. MreB mislocalization in SecA-defective cells significantly affects MreB-coordinated processes, such as cell wall synthesis, and induce formation of membrane invaginations enriched in high fluidity domains. Additionally, MreB is not recruited to the FtsZ ring in secA mutant cells, contributing to division arrest and cell filamentation. Our results show that all these faults are due to improper targeting of MreB to the membrane in the absence of SecA. Thus, when we reroute RodZ, MreB membrane-anchor, by fusing it to a SecA-independent integral membrane protein and overproducing it, MreB localization is restored and the defect in cell division is corrected. Notably, the RodZ moiety is not properly inserted into the membrane, strongly suggesting that it only serves as a bait for placing MreB around the cell circumference. Finally, we show that MreB localization depends on SecA also in C. crescentus, suggesting that regulation of MreB by the Sec system is conserved in bacteria. Taken together, our data reveal that the secretion system plays an important role in determining the organization and functioning of the cytoskeletal system in bacteria. The notion that bacterial cells have intricate spatial organization, which affects many vital processes, is relatively new and, hence, the underlying mechanisms are largely unknown. The general secretion system and the cytoskeleton are central systems, each known to organize functions associated with certain cellular domains, in both eukaryotes and prokaryotes. While the role of the Sec system in membrane protein translocation and secretion has been largely explored, not much in known about its role in inner cell organization. We show that the Sec system is important for the localization pattern and functionality of the bacterial cytoskeletal system, which controls cell shape, cell division and polarity. Our findings highlight the Sec system as a central coordinator that controls cellular functions on both sides of the membrane.
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166
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Baleeva NS, Zaitseva SO, Gorbachev DA, Smirnov AY, Zagudaylova MB, Baranov MS. The Role of N
-Substituents in Radiationless Deactivation of Aminated Derivatives of a Locked GFP Chromophore. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700805] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Nadezhda S. Baleeva
- Institute of Bioorganic Chemistry; Russian Academy of Sciences; Miklukho-Maklaya 16/10 117997 Moscow Russia
| | - Snezhana O. Zaitseva
- Institute of Bioorganic Chemistry; Russian Academy of Sciences; Miklukho-Maklaya 16/10 117997 Moscow Russia
| | - Dmitriy A. Gorbachev
- Institute of Bioorganic Chemistry; Russian Academy of Sciences; Miklukho-Maklaya 16/10 117997 Moscow Russia
| | - Alexander Yu. Smirnov
- Institute of Bioorganic Chemistry; Russian Academy of Sciences; Miklukho-Maklaya 16/10 117997 Moscow Russia
| | - Marina B. Zagudaylova
- Institute of Bioorganic Chemistry; Russian Academy of Sciences; Miklukho-Maklaya 16/10 117997 Moscow Russia
| | - Mikhail S. Baranov
- Institute of Bioorganic Chemistry; Russian Academy of Sciences; Miklukho-Maklaya 16/10 117997 Moscow Russia
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167
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Sezgin E, Schneider F, Zilles V, Urbančič I, Garcia E, Waithe D, Klymchenko AS, Eggeling C. Polarity-Sensitive Probes for Superresolution Stimulated Emission Depletion Microscopy. Biophys J 2017; 113:1321-1330. [PMID: 28734477 PMCID: PMC5607142 DOI: 10.1016/j.bpj.2017.06.050] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 06/22/2017] [Accepted: 06/27/2017] [Indexed: 11/17/2022] Open
Abstract
The lateral organization of molecules in the cellular plasma membrane plays an important role in cellular signaling. A critical parameter for membrane molecular organization is how the membrane lipids are packed. Polarity-sensitive dyes are powerful tools to characterize such lipid membrane order, employing, for example, confocal and two-photon microscopy. The investigation of potential nanodomains, however, requires the use of superresolution microscopy. Here, we test the performance of the polarity-sensitive membrane dyes Di-4-ANEPPDHQ, Di-4-AN(F)EPPTEA, and NR12S in superresolution stimulated emission depletion microscopy. Measurements on cell-derived membrane vesicles, in the plasma membrane of live cells, and on single virus particles, show the high potential of these dyes for probing nanoscale membrane heterogeneity.
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Affiliation(s)
- Erdinc Sezgin
- MRC Human Immunology UnitWeatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Falk Schneider
- MRC Human Immunology UnitWeatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Victoria Zilles
- MRC Human Immunology UnitWeatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Iztok Urbančič
- MRC Human Immunology UnitWeatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Esther Garcia
- MRC Human Immunology UnitWeatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Dominic Waithe
- Wolfson Imaging Centre Oxford, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Andrey S Klymchenko
- CNRS UMR 7213, Laboratoire de Biophotonique et Pharmacologie, University of Strasbourg, Illkirch Cedex, France
| | - Christian Eggeling
- MRC Human Immunology UnitWeatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom; Wolfson Imaging Centre Oxford, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom.
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168
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Moon S, Yan R, Kenny SJ, Shyu Y, Xiang L, Li W, Xu K. Spectrally Resolved, Functional Super-Resolution Microscopy Reveals Nanoscale Compositional Heterogeneity in Live-Cell Membranes. J Am Chem Soc 2017; 139:10944-10947. [DOI: 10.1021/jacs.7b03846] [Citation(s) in RCA: 112] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Seonah Moon
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Rui Yan
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Samuel J. Kenny
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Yennie Shyu
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Limin Xiang
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Wan Li
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
| | - Ke Xu
- Department
of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Division
of Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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169
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Pyrshev KA, Yesylevskyy SO, Mély Y, Demchenko AP, Klymchenko AS. Caspase-3 activation decreases lipid order in the outer plasma membrane leaflet during apoptosis: A fluorescent probe study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:2123-2132. [PMID: 28784460 DOI: 10.1016/j.bbamem.2017.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 07/12/2017] [Accepted: 08/03/2017] [Indexed: 12/23/2022]
Abstract
In this research we investigate the connection between the cytoplasmic machinery of apoptosis and the plasma membrane organization by studying the coupling of caspase-3 activation and inhibition with PS exposure and the change of lipid order in plasma membrane sensed by a fluorescent membrane probe NR12S. First, we performed in silico molecular dynamics simulations, which suggest that the mechanism of response of NR12S to lipid order may combine both sensitivity to membrane polarity/hydration and change in the fluorophore orientation. Second, cellular studies revealed that upon triggering apoptosis with IPA-3 and camptothecin the NR12S response is similar to that observed after decrease of lipid order induced by cholesterol depletion, 7-ketocholesterol enrichment or sphingomyelin hydrolysis. NR12S response can be influenced by a caspase-3 inhibitor Z-DEVD-FMK. Flow cytometry data further indicate that the NR12S response correlates with the response of FITC-labeled DEVD-FMK peptide and GFP-labeled Annexin V on the whole time scale (0-24h) of apoptosis induction by camptothecin. We conclude that fine changes in lipid order observed by NR12S are coupled with early steps of cellular events in apoptosis.
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Affiliation(s)
- Kyrylo A Pyrshev
- Laboratoire de Biophotonique et Pharmacologie UMR 7213 CNRS/Université de Strasbourg, Illkirch, France; Laboratory of Nanobiotechnologies, Department of Molecular Immunology, O.V. Palladin Institute of Biochemistry of NASU, Kyiv 01601, Ukraine.
| | - Semen O Yesylevskyy
- Department of Physics of Biological Systems, Institute of Physics of NASU, Kyiv 03680, Ukraine
| | - Yves Mély
- Laboratoire de Biophotonique et Pharmacologie UMR 7213 CNRS/Université de Strasbourg, Illkirch, France
| | - Alexander P Demchenko
- Laboratory of Nanobiotechnologies, Department of Molecular Immunology, O.V. Palladin Institute of Biochemistry of NASU, Kyiv 01601, Ukraine
| | - Andrey S Klymchenko
- Laboratoire de Biophotonique et Pharmacologie UMR 7213 CNRS/Université de Strasbourg, Illkirch, France
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170
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Kim JH, Singh A, Del Poeta M, Brown DA, London E. The effect of sterol structure upon clathrin-mediated and clathrin-independent endocytosis. J Cell Sci 2017; 130:2682-2695. [PMID: 28655854 DOI: 10.1242/jcs.201731] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 06/22/2017] [Indexed: 12/25/2022] Open
Abstract
Ordered lipid domains (rafts) in plasma membranes have been hypothesized to participate in endocytosis based on inhibition of endocytosis by removal or sequestration of cholesterol. To more carefully investigate the role of the sterol in endocytosis, we used a substitution strategy to replace cholesterol with sterols that show various raft-forming abilities and chemical structures. Both clathrin-mediated endocytosis of transferrin and clathrin-independent endocytosis of clustered placental alkaline phosphatase were measured. A subset of sterols reversibly inhibited both clathrin-dependent and clathrin-independent endocytosis. The ability of a sterol to support lipid raft formation was necessary for endocytosis. However, it was not sufficient, because a sterol lacking a 3β-OH group did not support endocytosis even though it had the ability to support ordered domain formation. Double bonds in the sterol rings and an aliphatic tail structure identical to that of cholesterol were neither necessary nor sufficient to support endocytosis. This study shows that substitution using a large number of sterols can define the role of sterol structure in cellular functions. Hypotheses for how sterol structure can similarly alter clathrin-dependent and clathrin-independent endocytosis are discussed.
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Affiliation(s)
- Ji Hyun Kim
- Dept. of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794, USA
| | - Ashutosh Singh
- Dept. of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, NY 11794, USA
| | - Maurizio Del Poeta
- Dept. of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, NY 11794, USA
| | - Deborah A Brown
- Dept. of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794, USA
| | - Erwin London
- Dept. of Biochemistry and Cell Biology, Stony Brook University, Stony Brook, NY 11794, USA
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171
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Mazeres S, Fereidouni F, Joly E. Using spectral decomposition of the signals from laurdan-derived probes to evaluate the physical state of membranes in live cells. F1000Res 2017; 6:763. [PMID: 28663788 PMCID: PMC5473435 DOI: 10.12688/f1000research.11577.2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/28/2017] [Indexed: 01/22/2023] Open
Abstract
Background: We wanted to investigate the physical state of biological membranes in live cells under the most physiological conditions possible. Methods: For this we have been using laurdan, C-laurdan or M-laurdan to label a variety of cells, and a biphoton microscope equipped with both a thermostatic chamber and a spectral analyser. We also used a flow cytometer to quantify the 450/530 nm ratio of fluorescence emissions by whole cells. Results: We find that using all the information provided by spectral analysis to perform spectral decomposition dramatically improves the imaging resolution compared to using just two channels, as commonly used to calculate generalized polarisation (GP). Coupled to a new plugin called Fraction Mapper, developed to represent the fraction of light intensity in the first component in a stack of two images, we obtain very clear pictures of both the intra-cellular distribution of the probes, and the polarity of the cellular environments where the lipid probes are localised. Our results lead us to conclude that, in live cells kept at 37°C, laurdan, and M-laurdan to a lesser extent, have a strong tendency to accumulate in the very apolar environment of intra-cytoplasmic lipid droplets, but label the plasma membrane (PM) of mammalian cells ineffectively. On the other hand, C-laurdan labels the PM very quickly and effectively, and does not detectably accumulate in lipid droplets. Conclusions: From using these probes on a variety of mammalian cell lines, as well as on cells from
Drosophila and
Dictyostelium discoideum, we conclude that, apart from the lipid droplets, which are very apolar, probes in intracellular membranes reveal a relatively polar and hydrated environment, suggesting a very marked dominance of liquid disordered states. PMs, on the other hand, are much more apolar, suggesting a strong dominance of liquid ordered state, which fits with their high sterol contents.
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Affiliation(s)
- Serge Mazeres
- Membrane and DNA Dynamics Team, Institut de Pharmacologie et de Biologie Structurale, CNRS, Université de Toulouse, Toulouse, F-31077, France
| | - Farzad Fereidouni
- Department of Pathology and Laboratory Medicine, University of California Davis Medical Center, CA 95817, CA, 4400, USA
| | - Etienne Joly
- Membrane and DNA Dynamics Team, Institut de Pharmacologie et de Biologie Structurale, CNRS, Université de Toulouse, Toulouse, F-31077, France
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172
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Mazeres S, Fereidouni F, Joly E. Using spectral decomposition of the signals from laurdan-derived probes to evaluate the physical state of membranes in live cells. F1000Res 2017; 6:763. [PMID: 28663788 DOI: 10.12688/f1000research.11577.1] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/26/2017] [Indexed: 12/13/2022] Open
Abstract
Background: We wanted to investigate the physical state of biological membranes in live cells under the most physiological conditions possible. Methods: For this we have been using laurdan, C-laurdan or M-laurdan to label a variety of cells, and a biphoton microscope equipped with both a thermostatic chamber and a spectral analyser. We also used a flow cytometer to quantify the 450/530 nm ratio of fluorescence emissions by whole cells. Results: We find that using all the information provided by spectral analysis to perform spectral decomposition dramatically improves the imaging resolution compared to using just two channels, as commonly used to calculate generalized polarisation (GP). Coupled to a new plugin called Fraction Mapper, developed to represent the fraction of light intensity in the first component in a stack of two images, we obtain very clear pictures of both the intra-cellular distribution of the probes, and the polarity of the cellular environments where the lipid probes are localised. Our results lead us to conclude that, in live cells kept at 37°C, laurdan, and M-laurdan to a lesser extent, have a strong tendency to accumulate in the very apolar environment of intra-cytoplasmic lipid droplets, but label the plasma membrane (PM) of mammalian cells ineffectively. On the other hand, C-laurdan labels the PM very quickly and effectively, and does not detectably accumulate in lipid droplets. Conclusions: From using these probes on a variety of mammalian cell lines, as well as on cells from Drosophila and Dictyostelium discoideum, we conclude that, apart from the lipid droplets, which are very apolar, probes in intracellular membranes reveal a relatively polar and hydrated environment, suggesting a very marked dominance of liquid disordered states. PMs, on the other hand, are much more apolar, suggesting a strong dominance of liquid ordered state, which fits with their high sterol contents.
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Affiliation(s)
- Serge Mazeres
- Membrane and DNA Dynamics Team, Institut de Pharmacologie et de Biologie Structurale, CNRS, Université de Toulouse, Toulouse, F-31077, France
| | - Farzad Fereidouni
- Department of Pathology and Laboratory Medicine, University of California Davis Medical Center, CA 95817, CA, 4400, USA
| | - Etienne Joly
- Membrane and DNA Dynamics Team, Institut de Pharmacologie et de Biologie Structurale, CNRS, Université de Toulouse, Toulouse, F-31077, France
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173
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Bouchaala R, Anton N, Anton H, Vandamme T, Vermot J, Smail D, Mély Y, Klymchenko AS. Light-triggered release from dye-loaded fluorescent lipid nanocarriers in vitro and in vivo. Colloids Surf B Biointerfaces 2017; 156:414-421. [PMID: 28551576 DOI: 10.1016/j.colsurfb.2017.05.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 05/11/2017] [Accepted: 05/12/2017] [Indexed: 12/26/2022]
Abstract
Light is an attractive trigger for release of active molecules from nanocarriers in biological systems. Here, we describe a phenomenon of light-induced release of a fluorescent dye from lipid nano-droplets under visible light conditions. Using auto-emulsification process we prepared nanoemulsion droplets of 32nm size encapsulating the hydrophobic analogue of Nile Red, NR668. While these nano-droplets cannot spontaneously enter the cells on the time scale of hours, after illumination for 30s under the microscope at the wavelength of NR668 absorption (535nm), the dye showed fast accumulation inside the cells. The same phenomenon was observed in zebrafish, where nano-droplets initially staining the blood circulation were released into endothelial cells and tissues after illumination. Fluorescence correlation spectroscopy revealed that laser illumination at relatively low power (60mW/cm2) could trigger the release of the dye into recipient media, such as 10% serum or blank lipid nanocarriers. The photo-release can be inhibited by deoxygenation with sodium sulfite, suggesting that at least in part the release could be related to a photochemical process involving oxygen, though a photo-thermal effect could also take place. Finally, we showed that illumination of NR668 can provoke the release into the cells of another highly hydrophobic dye co-encapsulated into the lipid nanocarriers. These results suggest dye-loaded lipid nano-droplets as a prospective platform for preparation of light-triggered nanocarriers of active molecules.
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Affiliation(s)
- Redouane Bouchaala
- CNRS UMR 7213, Laboratoire de Biophotonique et Pharmacologie, University of Strasbourg,74 route du Rhin, 67401 Illkirch Cedex, France; Laboratory of Photonic Systems and Nonlinear Optics, Institute of optics and fine mechanics, University of Setif 1, 19000 Algeria
| | - Nicolas Anton
- CNRS UMR 7199, Laboratoire de Conception et Application de Molécules Bioactives, University of Strasbourg,74 route du Rhin, 67401 Illkirch Cedex, France
| | - Halina Anton
- CNRS UMR 7213, Laboratoire de Biophotonique et Pharmacologie, University of Strasbourg,74 route du Rhin, 67401 Illkirch Cedex, France
| | - Thierry Vandamme
- CNRS UMR 7199, Laboratoire de Conception et Application de Molécules Bioactives, University of Strasbourg,74 route du Rhin, 67401 Illkirch Cedex, France
| | - Julien Vermot
- IGBMC (Institut de Génétique et de Biologie Moléculaire et Cellulaire), Inserm U964, CNRS UMR7104, Université de Strasbourg, 1 rue Laurent Fries, 67404 ILLKIRCH, France
| | - Djabi Smail
- Laboratory of Photonic Systems and Nonlinear Optics, Institute of optics and fine mechanics, University of Setif 1, 19000 Algeria
| | - Yves Mély
- CNRS UMR 7213, Laboratoire de Biophotonique et Pharmacologie, University of Strasbourg,74 route du Rhin, 67401 Illkirch Cedex, France
| | - Andrey S Klymchenko
- CNRS UMR 7213, Laboratoire de Biophotonique et Pharmacologie, University of Strasbourg,74 route du Rhin, 67401 Illkirch Cedex, France.
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174
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Targeting therapeutics to the plasma membrane: opportunities for nanoparticle-mediated delivery abound. Ther Deliv 2017; 8:235-237. [DOI: 10.4155/tde-2016-0091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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175
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Sherin PS, López-Duarte I, Dent MR, Kubánková M, Vyšniauskas A, Bull JA, Reshetnikova ES, Klymchenko AS, Tsentalovich YP, Kuimova MK. Visualising the membrane viscosity of porcine eye lens cells using molecular rotors. Chem Sci 2017; 8:3523-3528. [PMID: 28580097 PMCID: PMC5435988 DOI: 10.1039/c6sc05369f] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 02/14/2017] [Indexed: 12/15/2022] Open
Abstract
The plasma membranes of cells within the eye lens play an important role in metabolite transport within the avascular tissue of the lens, maintaining its transparency over the entire lifespan of an individual. Here we use viscosity-sensitive 'molecular rotors' to map the microscopic viscosity within these unusual cell membranes, establishing that they are characterised by an unprecedentedly high degree of lipid organisation.
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Affiliation(s)
- Peter S Sherin
- International Tomography Center SB RAS , Institutskaya Street 3A , 630090 , Novosibirsk , Russia .
- Department of Natural Sciences , Novosibirsk State University , Pirogova Street 2 , 630090 , Novosibirsk , Russia
| | - Ismael López-Duarte
- Department of Chemistry , Imperial College London , Exhibition Road , London , SW7 2AZ , UK .
| | - Michael R Dent
- Department of Chemistry , Imperial College London , Exhibition Road , London , SW7 2AZ , UK .
| | - Markéta Kubánková
- Department of Chemistry , Imperial College London , Exhibition Road , London , SW7 2AZ , UK .
| | - Aurimas Vyšniauskas
- Department of Chemistry , Imperial College London , Exhibition Road , London , SW7 2AZ , UK .
| | - James A Bull
- Department of Chemistry , Imperial College London , Exhibition Road , London , SW7 2AZ , UK .
| | - Evdokiya S Reshetnikova
- Institute of Molecular and Cellular Biology SB RAS , 8/2 Lavrentiev Avenue , 630090 , Novosibirsk , Russia
| | - Andrey S Klymchenko
- Laboratoire de Biophotonique et Pharmacologie , UMR 7213 CNRS , Faculté de Pharmacie , Université de Strasbourg , 74 Route du Rhin , 67401 ILLKIRCH Cedex , France
| | - Yuri P Tsentalovich
- International Tomography Center SB RAS , Institutskaya Street 3A , 630090 , Novosibirsk , Russia .
- Department of Natural Sciences , Novosibirsk State University , Pirogova Street 2 , 630090 , Novosibirsk , Russia
| | - Marina K Kuimova
- Department of Chemistry , Imperial College London , Exhibition Road , London , SW7 2AZ , UK .
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176
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Antimicrobial peptide cWFW kills by combining lipid phase separation with autolysis. Sci Rep 2017; 7:44332. [PMID: 28276520 PMCID: PMC5343580 DOI: 10.1038/srep44332] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Accepted: 02/07/2017] [Indexed: 12/17/2022] Open
Abstract
The synthetic cyclic hexapeptide cWFW (cyclo(RRRWFW)) has a rapid bactericidal activity against both Gram-positive and Gram-negative bacteria. Its detailed mode of action has, however, remained elusive. In contrast to most antimicrobial peptides, cWFW neither permeabilizes the membrane nor translocates to the cytoplasm. Using a combination of proteome analysis, fluorescence microscopy, and membrane analysis we show that cWFW instead triggers a rapid reduction of membrane fluidity both in live Bacillus subtilis cells and in model membranes. This immediate activity is accompanied by formation of distinct membrane domains which differ in local membrane fluidity, and which severely disrupts membrane protein organisation by segregating peripheral and integral proteins into domains of different rigidity. These major membrane disturbances cause specific inhibition of cell wall synthesis, and trigger autolysis. This novel antibacterial mode of action holds a low risk to induce bacterial resistance, and provides valuable information for the design of new synthetic antimicrobial peptides.
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177
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Tian M, Liu Y, Sun Y, Zhang R, Feng R, Zhang G, Guo L, Li X, Yu X, Sun JZ, He X. A single fluorescent probe enables clearly discriminating and simultaneously imaging liquid-ordered and liquid-disordered microdomains in plasma membrane of living cells. Biomaterials 2017; 120:46-56. [DOI: 10.1016/j.biomaterials.2016.12.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 12/06/2016] [Accepted: 12/16/2016] [Indexed: 12/31/2022]
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178
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Smith WS, Baker EJ, Holmes SE, Koster G, Hunt AN, Johnston DA, Flavell SU, Flavell DJ. Membrane cholesterol is essential for triterpenoid saponin augmentation of a saporin-based immunotoxin directed against CD19 on human lymphoma cells. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:993-1007. [PMID: 28235471 DOI: 10.1016/j.bbamem.2017.02.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/16/2017] [Accepted: 02/20/2017] [Indexed: 01/06/2023]
Abstract
Triterpenoid saponins from Saponinum Album (SA) exert potent lytic effects on eukaryotic cell plasma membranes and, when used at sub-lytic concentrations, significantly augment the cytotoxicity of saporin-based immunotoxins (IT). To help elucidate the mechanism(s) behind these two phenomena we investigated the role of cholesterol to both. Human Daudi lymphoma cells were lipid deprived using a combination of three different approaches. Following treatment, the total cellular lipid content was analyzed by electrospray ionization mass spectrometry (ESI-MS) and plasma membrane (PM) cholesterol content measured using the lipophilic fluorescent probe NR12S. Maximal lipid deprivation of cells resulted in a complete loss of sensitivity to lysis by SA. Similarly augmentation of the anti-CD19 immunotoxin (IT) BU12-SAPORIN by SA was lost but without a concomitant loss of intrinsic IT cytotoxicity. The lytic activity of SA was restored following incubation of lipid deprived Daudi cells with Synthecol or LDL. The augmentative effect of SA on IT cytotoxicity for Daudi cells was restored following repletion of PM cholesterol levels with LDL. NR12S fluorescence and ESI-MS analysis of cellular lipids demonstrated that restoration of SA lytic activity by Synthecol was entirely due to increased PM cholesterol levels. Restoration of cellular and PM cholesterol levels by LDL also restored the augmentative effect of SA for IT, an effect associated with repletion of PM cholesterol with minor changes in some phospholipid species. These results indicate that the lytic and IT augmentative properties of SA are cholesterol-dependent in contrast to intrinsic IT cytotoxicity that is at least partially cholesterol independent.
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Affiliation(s)
- Wendy S Smith
- The Simon Flavell Leukaemia Research Laboratory, Southampton General Hospital, Southampton, Hampshire SO16 6YD, United Kingdom
| | - Ella J Baker
- The Simon Flavell Leukaemia Research Laboratory, Southampton General Hospital, Southampton, Hampshire SO16 6YD, United Kingdom; Human Development and Health Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Suzanne E Holmes
- The Simon Flavell Leukaemia Research Laboratory, Southampton General Hospital, Southampton, Hampshire SO16 6YD, United Kingdom
| | - Grielof Koster
- NIHR Respiratory Biomedical Research Unit, UHS, University of Southampton School of Medicine, Southampton General Hospital, Southampton SO16 6YD, United Kingdom; Clinical and Experimental Sciences, University of Southampton School of Medicine, Southampton General Hospital, Southampton SO16 6YD, United Kingdom
| | - Alan N Hunt
- Clinical and Experimental Sciences, University of Southampton School of Medicine, Southampton General Hospital, Southampton SO16 6YD, United Kingdom
| | - David A Johnston
- Biomedical Imaging Unit, University of Southampton School of Medicine, Southampton General Hospital, Southampton SO16 6YD, United Kingdom
| | - Sopsamorn U Flavell
- The Simon Flavell Leukaemia Research Laboratory, Southampton General Hospital, Southampton, Hampshire SO16 6YD, United Kingdom
| | - David J Flavell
- The Simon Flavell Leukaemia Research Laboratory, Southampton General Hospital, Southampton, Hampshire SO16 6YD, United Kingdom.
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179
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Klymchenko AS. Solvatochromic and Fluorogenic Dyes as Environment-Sensitive Probes: Design and Biological Applications. Acc Chem Res 2017; 50:366-375. [PMID: 28067047 DOI: 10.1021/acs.accounts.6b00517] [Citation(s) in RCA: 643] [Impact Index Per Article: 91.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Fluorescent environment-sensitive probes are specially designed dyes that change their fluorescence intensity (fluorogenic dyes) or color (e.g., solvatochromic dyes) in response to change in their microenvironment polarity, viscosity, and molecular order. The studies of the past decade, including those of our group, have shown that these molecules become universal tools in fluorescence sensing and imaging. In fact, any biomolecular interaction or change in biomolecular organization results in modification of the local microenvironment, which can be directly monitored by these types of probes. In this Account, the main examples of environment-sensitive probes are summarized according to their design concepts. Solvatochromic dyes constitute a large class of environment-sensitive probes which change their color in response to polarity. Generally, they are push-pull dyes undergoing intramolecular charge transfer. Emission of their highly polarized excited state shifts to the red in more polar solvents. Excited-state intramolecular proton transfer is the second key concept to design efficient solvatochromic dyes, which respond to the microenvironment by changing relative intensity of the two emissive tautomeric forms. Due to their sensitivity to polarity and hydration, solvatochromic dyes have been successfully applied to biological membranes for studying lipid domains (rafts), apoptosis and endocytosis. As fluorescent labels, solvatochromic dyes can detect practically any type of biomolecular interactions, involving proteins, nucleic acids and biomembranes, because the binding event excludes local water molecules from the interaction site. On the other hand, fluorogenic probes usually exploit intramolecular rotation (conformation change) as a design concept, with molecular rotors being main representatives. These probes were particularly efficient for imaging viscosity and lipid order in biomembranes as well as to light up biomolecular targets, such as antibodies, aptamers and receptors. The emerging concepts to achieve fluorogenic response to the microenvironment include ground-state isomerization, aggregation-caused quenching, and aggregation-induced emission. The ground-state isomerization exploits, for instance, polarity-dependent spiro-lactone formation in silica-rhodamines. The aggregation-caused quenching uses disruption of the self-quenched dimers and nanoassemblies of dyes in less polar environments of lipid membranes and biomolecules. The aggregation-induced emission couples target recognition with formation of highly fluorescent dye aggregates. Overall, solvatochromic and fluorogenic probes enable background-free bioimaging in wash-free conditions as well as quantitative analysis when combined with advanced microscopy, such as fluorescence lifetime (FLIM) and ratiometric imaging. Further development of fluorescent environment-sensitive probes should address some remaining problems: (i) improving their optical properties, especially brightness, photostability, and far-red to near-infrared operating range; (ii) minimizing nonspecific interactions of the probes in biological systems; (iii) their adaptation for advanced microscopies, notably for superresolution and in vivo imaging.
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Affiliation(s)
- Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie,
UMR 7213 CNRS, Université de Strasbourg, F-67000 Strasbourg, France
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180
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Hiruta Y, Kanda Y, Katsuyama N, Kanazawa H. Dual temperature- and pH-responsive polymeric micelle for selective and efficient two-step doxorubicin delivery. RSC Adv 2017. [DOI: 10.1039/c7ra03579a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Dual responsive polymeric micelle enabled selective intracellular uptake with thermal stimulation and effective release of doxorubicin at acidic endosomal pH.
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Affiliation(s)
- Yuki Hiruta
- Faculty of Pharmacy
- Keio University
- Minato
- Japan
| | - Yuki Kanda
- Faculty of Pharmacy
- Keio University
- Minato
- Japan
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181
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Nematollahi MH, Pardakhty A, Torkzadeh-Mahanai M, Mehrabani M, Asadikaram G. Changes in physical and chemical properties of niosome membrane induced by cholesterol: a promising approach for niosome bilayer intervention. RSC Adv 2017. [DOI: 10.1039/c7ra07834j] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Recently, the self-assembly property of nonionic surfactants has been utilized to create vesicles as alternatives to liposomes.
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Affiliation(s)
- Mohammad Hadi Nematollahi
- Pharmaceutics Research Center
- Institute of Neuropharmacology
- Kerman University of Medical Science
- Kerman
- Iran
| | - Abbas Pardakhty
- Pharmaceutics Research Center
- Institute of Neuropharmacology
- Kerman University of Medical Science
- Kerman
- Iran
| | - Masoud Torkzadeh-Mahanai
- Biotechnology Department
- Institute of Science and High Technology and Environmental Sciences
- Graduate University of Advanced Technology
- Kerman
- Iran
| | - Mehrnaz Mehrabani
- Physiology Research Center
- Institute of Basic and Clinical Physiology Sciences
- Kerman University of Medical Sciences
- Kerman
- Iran
| | - Gholamreza Asadikaram
- Department of Biochemistry
- School of Medicine
- Kerman University of Medical Sciences
- Kerman
- Iran
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182
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Gaibelet G, Tercé F, Allart S, Lebrun C, Collet X, Jamin N, Orlowski S. Fluorescent probes for detecting cholesterol-rich ordered membrane microdomains: entangled relationships between structural analogies in the membrane and functional homologies in the cell. AIMS BIOPHYSICS 2017. [DOI: 10.3934/biophy.2017.1.121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
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183
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Shulov I, Rodik RV, Arntz Y, Reisch A, Kalchenko VI, Klymchenko AS. Protein-Sized Bright Fluorogenic Nanoparticles Based on Cross-Linked Calixarene Micelles with Cyanine Corona. Angew Chem Int Ed Engl 2016; 55:15884-15888. [PMID: 27862803 PMCID: PMC5756471 DOI: 10.1002/anie.201609138] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Indexed: 01/08/2023]
Abstract
The key challenge in the field of fluorescent nanoparticles (NPs) for biological applications is to achieve superior brightness for sizes equivalent to single proteins (3-7 nm). We propose a concept of shell-cross-linked fluorescent micelles, in which PEGylated cyanine 3 and 5 bis-azides form a covalently attached corona on micelles of amphiphilic calixarene bearing four alkyne groups. The fluorescence quantum yield of the obtained monodisperse NPs, with a size of 7 nm, is a function of viscosity and reached up to 15 % in glycerol. In the on-state they are circa 2-fold brighter than quantum dots (QD-585), which makes them the smallest PEGylated organic NPs of this high brightness. FRET between cyanine 3 and 5 cross-linkers at the surface of NPs suggests their integrity in physiological media, organic solvents, and living cells, in which the NPs rapidly internalize, showing excellent imaging contrast. Calixarene micelles with a cyanine corona constitute a new platform for the development of protein-sized ultrabright fluorescent NPs.
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Affiliation(s)
- Ievgen Shulov
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 67401 Route du Rhin, 74, ILLKIRCH Cedex (France); Organic Chemistry Department, Chemistry Faculty, Taras Shevchenko National University of Kyiv, 01033 Kyiv (Ukraine)
| | - Roman V. Rodik
- Institute of Organic Chemistry, National Academy of Science of Ukraine, 02660 Kyiv (Ukraine)
| | - Youri Arntz
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 67401 Route du Rhin, 74, ILLKIRCH Cedex (France)
| | - Andreas Reisch
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 67401 Route du Rhin, 74, ILLKIRCH Cedex (France)
| | - Vitaly I. Kalchenko
- Institute of Organic Chemistry, National Academy of Science of Ukraine, 02660 Kyiv (Ukraine)
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 67401 Route du Rhin, 74, ILLKIRCH Cedex (France)
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184
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Multi-dimensional super-resolution imaging enables surface hydrophobicity mapping. Nat Commun 2016; 7:13544. [PMID: 27929085 PMCID: PMC5155161 DOI: 10.1038/ncomms13544] [Citation(s) in RCA: 134] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 10/13/2016] [Indexed: 12/20/2022] Open
Abstract
Super-resolution microscopy allows biological systems to be studied at the nanoscale, but has been restricted to providing only positional information. Here, we show that it is possible to perform multi-dimensional super-resolution imaging to determine both the position and the environmental properties of single-molecule fluorescent emitters. The method presented here exploits the solvatochromic and fluorogenic properties of nile red to extract both the emission spectrum and the position of each dye molecule simultaneously enabling mapping of the hydrophobicity of biological structures. We validated this by studying synthetic lipid vesicles of known composition. We then applied both to super-resolve the hydrophobicity of amyloid aggregates implicated in neurodegenerative diseases, and the hydrophobic changes in mammalian cell membranes. Our technique is easily implemented by inserting a transmission diffraction grating into the optical path of a localization-based super-resolution microscope, enabling all the information to be extracted simultaneously from a single image plane.
Many super-resolution imaging techniques use fluorescence emission intensity to obtain precise positional information, but other spectral information is ignored. Here, the authors develop a method that records the spectrum and position of single dye molecules to map the hydrophobicity of a surface.
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185
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Shulov I, Rodik RV, Arntz Y, Reisch A, Kalchenko VI, Klymchenko AS. Protein-Sized Bright Fluorogenic Nanoparticles Based on Cross-Linked Calixarene Micelles with Cyanine Corona. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609138] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ievgen Shulov
- Laboratoire de Biophotonique et Pharmacologie; UMR 7213 CNRS; Université de Strasbourg; Faculté de Pharmacie; Route du Rhin, 74 Illkirch 67401 Cedex France
- Organic Chemistry Department; Chemistry Faculty; Taras Shevchenko National University of Kyiv; 01033 Kyiv Ukraine
| | - Roman V. Rodik
- Institute of Organic Chemistry; National Academy of Science of Ukraine; 02660 Kyiv Ukraine
| | - Youri Arntz
- Laboratoire de Biophotonique et Pharmacologie; UMR 7213 CNRS; Université de Strasbourg; Faculté de Pharmacie; Route du Rhin, 74 Illkirch 67401 Cedex France
| | - Andreas Reisch
- Laboratoire de Biophotonique et Pharmacologie; UMR 7213 CNRS; Université de Strasbourg; Faculté de Pharmacie; Route du Rhin, 74 Illkirch 67401 Cedex France
| | - Vitaly I. Kalchenko
- Institute of Organic Chemistry; National Academy of Science of Ukraine; 02660 Kyiv Ukraine
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie; UMR 7213 CNRS; Université de Strasbourg; Faculté de Pharmacie; Route du Rhin, 74 Illkirch 67401 Cedex France
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186
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Daptomycin inhibits cell envelope synthesis by interfering with fluid membrane microdomains. Proc Natl Acad Sci U S A 2016; 113:E7077-E7086. [PMID: 27791134 DOI: 10.1073/pnas.1611173113] [Citation(s) in RCA: 269] [Impact Index Per Article: 33.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Daptomycin is a highly efficient last-resort antibiotic that targets the bacterial cell membrane. Despite its clinical importance, the exact mechanism by which daptomycin kills bacteria is not fully understood. Different experiments have led to different models, including (i) blockage of cell wall synthesis, (ii) membrane pore formation, and (iii) the generation of altered membrane curvature leading to aberrant recruitment of proteins. To determine which model is correct, we carried out a comprehensive mode-of-action study using the model organism Bacillus subtilis and different assays, including proteomics, ionomics, and fluorescence light microscopy. We found that daptomycin causes a gradual decrease in membrane potential but does not form discrete membrane pores. Although we found no evidence for altered membrane curvature, we confirmed that daptomycin inhibits cell wall synthesis. Interestingly, using different fluorescent lipid probes, we showed that binding of daptomycin led to a drastic rearrangement of fluid lipid domains, affecting overall membrane fluidity. Importantly, these changes resulted in the rapid detachment of the membrane-associated lipid II synthase MurG and the phospholipid synthase PlsX. Both proteins preferentially colocalize with fluid membrane microdomains. Delocalization of these proteins presumably is a key reason why daptomycin blocks cell wall synthesis. Finally, clustering of fluid lipids by daptomycin likely causes hydrophobic mismatches between fluid and more rigid membrane areas. This mismatch can facilitate proton leakage and may explain the gradual membrane depolarization observed with daptomycin. Targeting of fluid lipid domains has not been described before for antibiotics and adds another dimension to our understanding of membrane-active antibiotics.
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187
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Zhu H, Fan J, Mu H, Zhu T, Zhang Z, Du J, Peng X. d-PET-controlled "off-on" Polarity-sensitive Probes for Reporting Local Hydrophilicity within Lysosomes. Sci Rep 2016; 6:35627. [PMID: 27767190 PMCID: PMC5073283 DOI: 10.1038/srep35627] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 10/03/2016] [Indexed: 01/13/2023] Open
Abstract
Polarity-sensitive fluorescent probes are powerful chemical tools for studying biomolecular structures and activities both in vitro and in vivo. However, the lack of "off-on" polarity-sensing probes has limited the accurate monitoring of biological processes that involve an increase in local hydrophilicity. Here, we design and synthesize a series of "off-on" polarity-sensitive fluorescent probes BP series consisting of the difluoroboron dippyomethene (BODIPY) fluorophore connected to a quaternary ammonium moiety via different carbon linkers. All these probes showed low fluorescence quantum yields in nonpolar solution but became highly fluorescent in polar media. BP-2, which contains a two-carbon linker and a trimethyl quaternary ammonium, displayed a fluorescence intensity and quantum yield that were both linearly correlated with solvent polarity. In addition, BP-2 exhibited high sensitivity and selectivity for polarity over other environmental factors and a variety of biologically relevant species. BP-2 can be synthesized readily via an unusual Mannich reaction followed by methylation. Using electrochemistry combined with theoretical calculations, we demonstrated that the "off-on" sensing behavior of BP-2 is primarily due to the polarity-dependent donor-excited photoinduced electron transfer (d-PET) effect. Live-cell imaging established that BP-2 enables the detection of local hydrophilicity within lysosomes under conditions of lysosomal dysfunction.
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Affiliation(s)
- Hao Zhu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
| | - Jiangli Fan
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
| | - Huiying Mu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
| | - Tao Zhu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
| | - Zhen Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
| | - Jianjun Du
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China
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188
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Vyšniauskas A, Qurashi M, Kuimova MK. A Molecular Rotor that Measures Dynamic Changes of Lipid Bilayer Viscosity Caused by Oxidative Stress. Chemistry 2016; 22:13210-7. [PMID: 27487026 PMCID: PMC5096028 DOI: 10.1002/chem.201601925] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 11/23/2022]
Abstract
Oxidation of cellular structures is typically an undesirable process that can be a hallmark of certain diseases. On the other hand, photooxidation is a necessary step of photodynamic therapy (PDT), a cancer treatment causing cell death upon light irradiation. Here, the effect of photooxidation on the microscopic viscosity of model lipid bilayers constructed of 1,2-dioleoyl-sn-glycero-3-phosphocholine has been studied. A molecular rotor has been employed that displays a viscosity-dependent fluorescence lifetime as a quantitative probe of the bilayer's viscosity. Thus, spatially-resolved viscosity maps of lipid photooxidation in giant unilamellar vesicles (GUVs) were obtained, testing the effect of the positioning of the oxidant relative to the rotor in the bilayer. It was found that PDT has a strong impact on viscoelastic properties of lipid bilayers, which 'travels' through the bilayer to areas that have not been irradiated directly. A dramatic difference in viscoelastic properties of oxidized GUVs by Type I (electron transfer) and Type II (singlet oxygen-based) photosensitisers was also detected.
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Affiliation(s)
- Aurimas Vyšniauskas
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Maryam Qurashi
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Marina K Kuimova
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
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189
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Dziuba D, Pospíšil P, Matyašovský J, Brynda J, Nachtigallová D, Rulíšek L, Pohl R, Hof M, Hocek M. Solvatochromic fluorene-linked nucleoside and DNA as color-changing fluorescent probes for sensing interactions. Chem Sci 2016; 7:5775-5785. [PMID: 30034716 PMCID: PMC6021979 DOI: 10.1039/c6sc02548j] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 06/20/2016] [Indexed: 12/16/2022] Open
Abstract
A nucleoside bearing a solvatochromic push-pull fluorene fluorophore (dCFL ) was designed and synthesized by the Sonogashira coupling of alkyne-linked fluorene 8 with 5-iodo-2'-deoxycytidine. The fluorene building block 8 and labeled nucleoside dCFL exerted bright fluorescence with significant solvatochromic effect providing emission maxima ranging from 421 to 544 nm and high quantum yields even in highly polar solvents, including water. The solvatochromism of 8 was studied by DFT and ADC(2) calculations to show that, depending on the polarity of the solvent, emission either from the planar or the twisted conformation of the excited state can occur. The nucleoside was converted to its triphosphate variant dCFLTP which was found to be a good substrate for DNA polymerases suitable for the enzymatic synthesis of oligonucleotide or DNA probes by primer extension or PCR. The fluorene-linked DNA can be used as fluorescent probes for DNA-protein (p53) or DNA-lipid interactions, exerting significant color changes visible even to the naked eye. They also appear to be suitable for time-dependent fluorescence shift studies on DNA, yielding information on DNA hydration and dynamics.
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Affiliation(s)
- Dmytro Dziuba
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
| | - Petr Pospíšil
- J. H eyrovský Institute of Physical Chemistry , Czech Academy of Sciences , Dolejskova 3 , CZ-182 23 Prague , Czech Republic
| | - Ján Matyašovský
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
| | - Jiří Brynda
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
| | - Dana Nachtigallová
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
| | - Lubomír Rulíšek
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
| | - Martin Hof
- J. H eyrovský Institute of Physical Chemistry , Czech Academy of Sciences , Dolejskova 3 , CZ-182 23 Prague , Czech Republic
| | - Michal Hocek
- Institute of Organic Chemistry and Biochemistry , Czech Academy of Sciences , Gilead & IOCB Research Center , Flemingovo nam. 2 , CZ-16610 Prague 6 , Czech Republic .
- Department of Organic Chemistry , Faculty of Science , Charles University in Prague , Hlavova 8 , CZ-12843 Prague 2 , Czech Republic
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190
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Distribution of a model bioactive within solid lipid nanoparticles and nanostructured lipid carriers influences its loading efficiency and oxidative stability. Int J Pharm 2016; 511:322-330. [DOI: 10.1016/j.ijpharm.2016.07.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 05/30/2016] [Accepted: 07/09/2016] [Indexed: 12/18/2022]
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191
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Houston JE, Kraft M, Mooney I, Terry AE, Scherf U, Evans RC. Charge-Mediated Localization of Conjugated Polythiophenes in Zwitterionic Model Cell Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8141-8153. [PMID: 27434827 DOI: 10.1021/acs.langmuir.6b01828] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The selective engineering of conjugated polyelectrolyte (CPE)-phospholipid interfaces is poised to play a key role in the design of advanced biomedical and biotechnological devices. Herein, we report a strategic study to investigate the relationship between the charge of the CPE side group and their association with zwitterionic phospholipid bilayers. The interaction of dipalmitoylphosphatidylcholine (DPPC) phospholipid vesicles with a series of poly(thiophene)s bearing zwitterionic, cationic, or anionic terminal groups (P3Zwit, P3TMAHT and P3Anionic, respectively) has been probed. Although all CPEs showed an affinity for the zwitterionic vesicles, the calculated partition coefficients determined using photoluminescence spectroscopy suggested preferential incorporation within the lipid bilayer in the order P3Zwit > P3Anionic ≫ P3TMAHT. The polarity probe Prodan was used to further qualify the position of the CPE inside the vesicle bilayers via Förster resonance energy transfer (FRET) studies. The varying proximity of the CPEs to Prodan was reflected in the Stern-Volmer quenching constants and decreased in the order P3Anionic > P3TMAHT ≫ P3Zwit. Dynamic light scattering measurements showed an increase in the hydrodynamic diameter of the DPPC vesicles upon addition of each poly(thiophene), but to the greatest extent for P3Anionic. Small-angle neutron scattering studies also revealed that P3Anionic specifically increased the thickness of the headgroup region of the phospholipid bilayer. Epifluorescence and atomic force microscopy imaging showed that P3TMAHT formed amorphous agglomerates on the vesicle surface, P3Zwit was buried throughout the bilayer, and P3Anionic formed a shell of protruding chains around the surface, which promoted vesicle fusion. The global data indicate three distinctive modes of interaction for the poly(thiophene)s within DPPC vesicles, whereby the nature of the association is ultimately controlled by the pendant charge group on each CPE chain. Our results suggest that charge-mediated self-assembly may provide a simple and effective route to design luminescent CPE probes capable of specific localization within phospholipid membranes.
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Affiliation(s)
- Judith E Houston
- School of Chemistry and CRANN, University of Dublin, Trinity College , College Green, Dublin 2, Ireland
| | - Mario Kraft
- Macromolecular Chemistry Group (Buwmakro) and Institute for Polymer Technology, Bergische Universität Wuppertal , Gauss-Str. 20, D-42119 Wuppertal, Germany
| | - Ian Mooney
- School of Chemistry and CRANN, University of Dublin, Trinity College , College Green, Dublin 2, Ireland
| | - Ann E Terry
- ISIS, STFC, Rutherford Appleton Laboratory, Didcot, Oxon OX11 0QX, U.K
| | - Ullrich Scherf
- Macromolecular Chemistry Group (Buwmakro) and Institute for Polymer Technology, Bergische Universität Wuppertal , Gauss-Str. 20, D-42119 Wuppertal, Germany
| | - Rachel C Evans
- School of Chemistry and CRANN, University of Dublin, Trinity College , College Green, Dublin 2, Ireland
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192
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Ailte I, Lingelem ABD, Kavaliauskiene S, Bergan J, Kvalvaag AS, Myrann AG, Skotland T, Sandvig K. Addition of lysophospholipids with large head groups to cells inhibits Shiga toxin binding. Sci Rep 2016; 6:30336. [PMID: 27458147 PMCID: PMC4960542 DOI: 10.1038/srep30336] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 06/30/2016] [Indexed: 12/20/2022] Open
Abstract
Shiga toxin (Stx), an AB5 toxin, binds specifically to the neutral glycosphingolipid Gb3 at the cell surface before being transported into cells. We here demonstrate that addition of conical lysophospholipids (LPLs) with large head groups inhibit Stx binding to cells whereas LPLs with small head groups do not. Lysophosphatidylinositol (LPI 18:0), the most efficient LPL with the largest head group, was selected for in-depth investigations to study how the binding of Stx is regulated. We show that the inhibition of Stx binding by LPI is reversible and possibly regulated by cholesterol since addition of methyl-β-cyclodextrin (mβCD) reversed the ability of LPI to inhibit binding. LPI-induced inhibition of Stx binding is independent of signalling and membrane turnover as it occurs in fixed cells as well as after depletion of cellular ATP. Furthermore, data obtained with fluorescent membrane dyes suggest that LPI treatment has a direct effect on plasma membrane lipid packing with shift towards a liquid disordered phase in the outer leaflet, while lysophosphoethanolamine (LPE), which has a small head group, does not. In conclusion, our data show that cellular treatment with conical LPLs with large head groups changes intrinsic properties of the plasma membrane and modulates Stx binding to Gb3.
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Affiliation(s)
- Ieva Ailte
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway.,Department of Biosciences, University of Oslo, Oslo, Norway
| | - Anne Berit Dyve Lingelem
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway
| | - Simona Kavaliauskiene
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway.,Department of Biosciences, University of Oslo, Oslo, Norway
| | - Jonas Bergan
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway.,Department of Research and Innovation, Østfold Hospital, Sarpsborg, Norway
| | - Audun Sverre Kvalvaag
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway
| | - Anne-Grethe Myrann
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway
| | - Tore Skotland
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway
| | - Kirsten Sandvig
- Centre for Cancer Biomedicine, Faculty of Medicine, University of Oslo, Oslo, Norway.,Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, Montebello, Oslo, Norway.,Department of Biosciences, University of Oslo, Oslo, Norway
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193
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Jiang YW, Guo HY, Chen Z, Yu ZW, Wang Z, Wu FG. In Situ Visualization of Lipid Raft Domains by Fluorescent Glycol Chitosan Derivatives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6739-6745. [PMID: 27276053 DOI: 10.1021/acs.langmuir.6b00193] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Lipid rafts are highly ordered small microdomains mainly composed of glycosphingolipids, cholesterol, and protein receptors. Optically distinguishing lipid raft domains in cell membranes would greatly facilitate the investigations on the structure and dynamics of raft-related cellular behaviors, such as signal transduction, membrane transport (endocytosis), adhesion, and motility. However, current strategies about the visualization of lipid raft domains usually suffer from the low biocompatibility of the probes, invasive detection, or ex situ observation. At the same time, naturally derived biomacromolecules have been extensively used in biomedical field and their interaction with cells remains a long-standing topic since it is closely related to various fundamental studies and potential applications. Herein, noninvasive visualization of lipid raft domains in model lipid bilayers (supported lipid bilayers and giant unilamellar vesicles) and live cells was successfully realized in situ using fluorescent biomacromolecules: the fluorescein isothiocyanate (FITC)-labeled glycol chitosan molecules. We found that the lipid raft domains in model or real membranes could be specifically stained by the FITC-labeled glycol chitosan molecules, which could be attributed to the electrostatic attractive interaction and/or hydrophobic interaction between the probes and the lipid raft domains. Since the FITC-labeled glycol chitosan molecules do not need to completely insert into the lipid bilayer and will not disturb the organization of lipids, they can more accurately visualize the raft domains as compared with other fluorescent dyes that need to be premixed with the various lipid molecules prior to the fabrication of model membranes. Furthermore, the FITC-labeled glycol chitosan molecules were found to be able to resist cellular internalization and could successfully visualize rafts in live cells. The present work provides a new way to achieve the imaging of lipid rafts and also sheds new light on the interaction between biomacromolecules and lipid membranes.
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Affiliation(s)
- Yao-Wen Jiang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , Nanjing 210096, P. R. China
| | - Hao-Yue Guo
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , Nanjing 210096, P. R. China
| | - Zhan Chen
- Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Zhi-Wu Yu
- Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University , Beijing 100084, P. R. China
| | - Zhifei Wang
- School of Chemistry and Chemical Engineering, Southeast University , Nanjing 211189, P. R. China
| | - Fu-Gen Wu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University , Nanjing 210096, P. R. China
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194
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Collot M, Kreder R, Tatarets AL, Patsenker LD, Mely Y, Klymchenko AS. Bright fluorogenic squaraines with tuned cell entry for selective imaging of plasma membrane vs. endoplasmic reticulum. Chem Commun (Camb) 2016; 51:17136-9. [PMID: 26455447 DOI: 10.1039/c5cc06094j] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A rational design of squaraine dyes with lipophilic and zwitterionic groups tunes cell entry, allowing for selective far-red/near-infrared imaging of plasma membrane vs. endoplasmic reticulum. They exhibit up to 110-fold fluorescence enhancement in biomembranes and enable cellular imaging at 1 nM concentration, which make them the brightest membrane probes to date.
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Affiliation(s)
- Mayeul Collot
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401, Illkirch, France.
| | - Rémy Kreder
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401, Illkirch, France.
| | - Anatoliy L Tatarets
- The State Scientific Institution "Institute for Single Crystals" of the National Academy of Sciences of Ukraine, 60, Lenin Ave., Kharkiv, 61001, Ukraine
| | - Leonid D Patsenker
- The State Scientific Institution "Institute for Single Crystals" of the National Academy of Sciences of Ukraine, 60, Lenin Ave., Kharkiv, 61001, Ukraine
| | - Yves Mely
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401, Illkirch, France.
| | - Andrey S Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401, Illkirch, France.
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195
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Tang TSM, Liu HW, Lo KKW. Structural Manipulation of Ruthenium(II) Polypyridine Nitrone Complexes to Generate Phosphorogenic Bioorthogonal Reagents for Selective Cellular Labeling. Chemistry 2016; 22:9649-59. [DOI: 10.1002/chem.201601332] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Indexed: 12/12/2022]
Affiliation(s)
- Tommy Siu-Ming Tang
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
| | - Hua-Wei Liu
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
| | - Kenneth Kam-Wing Lo
- Department of Biology and Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
- State Key Laboratory of Millimeter Waves; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
- Center for Functional Photonics; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong P.R. China
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196
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Karpenko IA, Niko Y, Yakubovskyi VP, Gerasov AO, Bonnet D, Kovtun YP, Klymchenko AS. Push-pull dioxaborine as fluorescent molecular rotor: far-red fluorogenic probe for ligand-receptor interactions. JOURNAL OF MATERIALS CHEMISTRY. C 2016; 4:3002-3009. [PMID: 28491320 PMCID: PMC5421572 DOI: 10.1039/c5tc03411f] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fluorescent solvatochromic dyes and molecular rotors increase their popularity as fluorogenic probes for background-free detection of biomolecules in cellulo in no-wash conditions. Here, we introduce a push-pull boron-containing (dioxaborine) dye that presents unique spectroscopic behavior combining solvatochromism and molecular rotor properties. Indeed, in organic solvents, it shows strong red shifts in the absorption and fluorescence spectra upon increase in solvent polarity, typical for push-pull dyes. On the other hand, in polar solvents, where it probably undergoes Twisted Intramolecular Charge Transfer (TICT), the dye displays strong dependence of its quantum yield on solvent viscosity, in accordance to Förster-Hoffmann equation. In comparison to solvatochromic and molecular rotor dyes, dioxaborine derivative shows exceptional extinction coefficient (120,000 M-1 cm-1), high fluorescence quantum yields and red/far-red operating spectral range. It also displays much higher photostability in apolar media as compared to Nile Red, a fluorogenic dye of similar color. Its reactive carboxy derivative has been successfully grafted to carbetocin, a ligand of the oxytocin G protein-coupled receptor. This conjugate exhibits >1000-fold turn on between apolar 1,4-dioxane and water. It targets specifically the oxytocin receptor at the cell surface, which enables receptor imaging with excellent signal-to-background ratio (>130). We believe that presented push-pull dioxaborine dye opens a new page in the development of fluorogenic probes for bioimaging applications.
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Affiliation(s)
- Iuliia A. Karpenko
- Laboratoire d’Innovation Thérapeutique, UMR 7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Yosuke Niko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS/Université de Strasbourg, Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Viktor P. Yakubovskyi
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, 5 Murmanska Street, 02094 Kyiv, Ukraine
| | - Andriy O. Gerasov
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, 5 Murmanska Street, 02094 Kyiv, Ukraine
| | - Dominique Bonnet
- Laboratoire d’Innovation Thérapeutique, UMR 7200 CNRS/Université de Strasbourg, Labex MEDALIS, Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
| | - Yuriy P. Kovtun
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, 5 Murmanska Street, 02094 Kyiv, Ukraine
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS/Université de Strasbourg, Faculté de Pharmacie, 74 route du Rhin, 67401 Illkirch, France
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197
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Maity P, Saha B, Kumar GS, Karmakar S. Binding of monovalent alkali metal ions with negatively charged phospholipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:706-14. [DOI: 10.1016/j.bbamem.2016.01.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 01/15/2016] [Accepted: 01/18/2016] [Indexed: 11/30/2022]
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198
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Niko Y, Didier P, Mely Y, Konishi GI, Klymchenko AS. Bright and photostable push-pull pyrene dye visualizes lipid order variation between plasma and intracellular membranes. Sci Rep 2016; 6:18870. [PMID: 26750324 PMCID: PMC4707542 DOI: 10.1038/srep18870] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Accepted: 11/30/2015] [Indexed: 12/23/2022] Open
Abstract
Imaging lipid organization in cell membranes requires advanced fluorescent probes. Here, we show that a recently synthesized push-pull pyrene (PA), similarly to popular probe Laurdan, changes the emission maximum as a function of lipid order, but outperforms it by spectroscopic properties. In addition to red-shifted absorption compatible with common 405 nm diode laser, PA shows higher brightness and much higher photostability than Laurdan in apolar membrane environments. Moreover, PA is compatible with two-photon excitation at wavelengths >800 nm, which was successfully used for ratiometric imaging of coexisting liquid ordered and disordered phases in giant unilamellar vesicles. Fluorescence confocal microscopy in Hela cells revealed that PA efficiently stains the plasma membrane and the intracellular membranes at >20-fold lower concentrations, as compared to Laurdan. Finally, ratiometric imaging using PA reveals variation of lipid order within different cellular compartments: plasma membranes are close to liquid ordered phase of model membranes composed of sphingomyelin and cholesterol, while intracellular membranes are much less ordered, matching well membranes composed of unsaturated phospholipids without cholesterol. These differences in the lipid order were confirmed by fluorescence lifetime imaging (FLIM) at the blue edge of PA emission band. PA probe constitutes thus a new powerful tool for biomembrane research.
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Affiliation(s)
- Yosuke Niko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-H-134 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Pascal Didier
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
| | - Yves Mely
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
| | - Gen-ichi Konishi
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-H-134 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
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199
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Soleimanpour S, Colom A, Derivery E, Gonzalez-Gaitan M, Roux A, Sakai N, Matile S. Headgroup engineering in mechanosensitive membrane probes. Chem Commun (Camb) 2016; 52:14450-14453. [DOI: 10.1039/c6cc08771j] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Tricky chemistry had to be addressed to make mechanosensitive membrane probes ready for use, including a chalcogen-bond mediated “molecular guillotinylation”.
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Affiliation(s)
- Saeideh Soleimanpour
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
| | - Adai Colom
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
| | - Emmanuel Derivery
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
| | - Marcos Gonzalez-Gaitan
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
| | - Aurelien Roux
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
| | - Naomi Sakai
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
| | - Stefan Matile
- NCCR Chemical Biology
- School of Chemistry and Biochemistry
- University of Geneva
- Geneva
- Switzerland
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200
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Xu Q, Zhao T, Sun Z. Monitoring drug–lipid membrane interactions via a molecular rotor probe. Analyst 2016; 141:4676-84. [DOI: 10.1039/c6an00721j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A label-free sensing method based on membrane viscosity changes to study the interactions between small drug molecules and lipid bilayers.
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Affiliation(s)
- Qinqin Xu
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai
- China
| | - Tao Zhao
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai
- China
| | - Zhihua Sun
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai
- China
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