1
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Paez‐Perez M, Kuimova MK. Molecular Rotors: Fluorescent Sensors for Microviscosity and Conformation of Biomolecules. Angew Chem Int Ed Engl 2024; 63:e202311233. [PMID: 37856157 PMCID: PMC10952837 DOI: 10.1002/anie.202311233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 10/17/2023] [Accepted: 10/17/2023] [Indexed: 10/20/2023]
Abstract
The viscosity and crowding of biological environment are considered vital for the correct cellular function, and alterations in these parameters are known to underly a number of pathologies including diabetes, malaria, cancer and neurodegenerative diseases, to name a few. Over the last decades, fluorescent molecular probes termed molecular rotors proved extremely useful for exploring viscosity, crowding, and underlying molecular interactions in biologically relevant settings. In this review, we will discuss the basic principles underpinning the functionality of these probes and will review advances in their use as sensors for lipid order, protein crowding and conformation, temperature and non-canonical nucleic acid structures in live cells and other relevant biological settings.
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Affiliation(s)
- Miguel Paez‐Perez
- Department of Chemistry, Imperial College London, MSRHImperial College LondonWood LaneLondonW12 0BZUK
| | - Marina K. Kuimova
- Department of Chemistry, Imperial College London, MSRHImperial College LondonWood LaneLondonW12 0BZUK
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2
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Robinson J, Stenspil SG, Maleckaite K, Bartlett M, Di Antonio M, Vilar R, Kuimova MK. Cellular Visualization of G-Quadruplex RNA via Fluorescence- Lifetime Imaging Microscopy. J Am Chem Soc 2024; 146:1009-1018. [PMID: 38151240 PMCID: PMC10786036 DOI: 10.1021/jacs.3c11908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/29/2023]
Abstract
Over the past decade, appreciation of the roles of G-quadruplex (G4) structures in cellular regulation and maintenance has rapidly grown, making the establishment of robust methods to visualize G4s increasingly important. Fluorescent probes are commonly used for G4 detection in vitro; however, achieving sufficient selectivity to detect G4s in a dense and structurally diverse cellular environment is challenging. The use of fluorescent probes for G4 detection is further complicated by variations of probe uptake into cells, which may affect fluorescence intensity independently of G4 abundance. In this work, we report an alternative small-molecule approach to visualize G4s that does not rely on fluorescence intensity switch-on and, thus, does not require the use of molecules with exclusive G4 binding selectivity. Specifically, we have developed a novel thiazole orange derivative, TOR-G4, that exhibits a unique fluorescence lifetime when bound to G4s compared to other structures, allowing G4 binding to be sensitively distinguished from non-G4 binding, independent of the local probe concentration. Furthermore, TOR-G4 primarily colocalizes with RNA in the cytoplasm and nucleoli of cells, making it the first lifetime-based probe validated for exploring the emerging roles of RNA G4s in cellulo.
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Affiliation(s)
- Jenna Robinson
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
- Molecular
Science Research Hub, Institute of Chemical
Biology, 82 Wood Lane, London W12 0BZ, U.K.
- The
Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K.
| | - Stine G. Stenspil
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
| | - Karolina Maleckaite
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
| | - Molly Bartlett
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
| | - Marco Di Antonio
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
- Molecular
Science Research Hub, Institute of Chemical
Biology, 82 Wood Lane, London W12 0BZ, U.K.
- The
Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K.
| | - Ramon Vilar
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
- Molecular
Science Research Hub, Institute of Chemical
Biology, 82 Wood Lane, London W12 0BZ, U.K.
| | - Marina K. Kuimova
- Department
of Chemistry, Molecular Science Research Hub, Imperial College London, 82 Wood Lane, London W12
0BZ, U.K.
- Molecular
Science Research Hub, Institute of Chemical
Biology, 82 Wood Lane, London W12 0BZ, U.K.
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3
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Efremov YM, Shimolina L, Gulin A, Ignatova N, Gubina M, Kuimova MK, Timashev PS, Shirmanova MV. Correlation of Plasma Membrane Microviscosity and Cell Stiffness Revealed via Fluorescence-Lifetime Imaging and Atomic Force Microscopy. Cells 2023; 12:2583. [PMID: 37947661 PMCID: PMC10650173 DOI: 10.3390/cells12212583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Revised: 10/23/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023] Open
Abstract
The biophysical properties of cells described at the level of whole cells or their membranes have many consequences for their biological behavior. However, our understanding of the relationships between mechanical parameters at the level of cell (stiffness, viscoelasticity) and at the level of the plasma membrane (fluidity) remains quite limited, especially in the context of pathologies, such as cancer. Here, we investigated the correlations between cells' stiffness and viscoelastic parameters, mainly determined via the actin cortex, and plasma membrane microviscosity, mainly determined via its lipid profile, in cancer cells, as these are the keys to their migratory capacity. The mechanical properties of cells were assessed using atomic force microscopy (AFM). The microviscosity of membranes was visualized using fluorescence-lifetime imaging microscopy (FLIM) with the viscosity-sensitive probe BODIPY 2. Measurements were performed for five human colorectal cancer cell lines that have different migratory activity (HT29, Caco-2, HCT116, SW 837, and SW 480) and their chemoresistant counterparts. The actin cytoskeleton and the membrane lipid composition were also analyzed to verify the results. The cell stiffness (Young's modulus), measured via AFM, correlated well (Pearson r = 0.93) with membrane microviscosity, measured via FLIM, and both metrics were elevated in more motile cells. The associations between stiffness and microviscosity were preserved upon acquisition of chemoresistance to one of two chemotherapeutic drugs. These data clearly indicate that mechanical parameters, determined by two different cellular structures, are interconnected in cells and play a role in their intrinsic migratory potential.
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Affiliation(s)
- Yuri M. Efremov
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia;
| | - Liubov Shimolina
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (M.V.S.)
| | - Alexander Gulin
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia; (A.G.); (M.G.)
| | - Nadezhda Ignatova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (M.V.S.)
| | - Margarita Gubina
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 119991 Moscow, Russia; (A.G.); (M.G.)
| | - Marina K. Kuimova
- Department of Chemistry, Imperial College London, White City Campus, London W12 0BZ, UK;
| | - Peter S. Timashev
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia;
- World-Class Research Center “Digital Biodesign and Personalized Healthcare”, Sechenov University, 119991 Moscow, Russia
| | - Marina V. Shirmanova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (M.V.S.)
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4
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Berrones Reyes J, Sherin PS, Sarkar A, Kuimova MK, Vilar R. Platinum(II)-Based Optical Probes for Imaging Quadruplex DNA Structures via Phosphorescence Lifetime Imaging Microscopy. Angew Chem Int Ed Engl 2023; 62:e202310402. [PMID: 37642538 PMCID: PMC10952808 DOI: 10.1002/anie.202310402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/27/2023] [Accepted: 08/29/2023] [Indexed: 08/31/2023]
Abstract
G-quadruplex DNA is a non-canonical structure that forms in guanine-rich regions of the genome. There is increasing evidence showing that G-quadruplexes have important biological functions, and therefore molecular tools to visualise these structures are important. Herein we report on a series of new cyclometallated platinum(II) complexes which, upon binding to G-quadruplex DNA, display an increase in their phosphorescence, acting as switch-on probes. More importantly, upon binding to G-quadruplexes they display a selective and distinct lengthening of their emission lifetime. We show that this effect can be used to selectively visualise these structures in cells using Phosphorescence Lifetime Imaging Microscopy (PLIM).
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Affiliation(s)
- Jessica Berrones Reyes
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Peter S. Sherin
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Amrita Sarkar
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Marina K. Kuimova
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Ramon Vilar
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
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5
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Berrones Reyes J, Sherin PS, Sarkar A, Kuimova MK, Vilar R. Platinum(II)-Based Optical Probes for Imaging Quadruplex DNA Structures via Phosphorescence Lifetime Imaging Microscopy. Angew Chem Weinheim Bergstr Ger 2023; 135:e202310402. [PMID: 38516271 PMCID: PMC10952342 DOI: 10.1002/ange.202310402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Indexed: 03/23/2024]
Abstract
G-quadruplex DNA is a non-canonical structure that forms in guanine-rich regions of the genome. There is increasing evidence showing that G-quadruplexes have important biological functions, and therefore molecular tools to visualise these structures are important. Herein we report on a series of new cyclometallated platinum(II) complexes which, upon binding to G-quadruplex DNA, display an increase in their phosphorescence, acting as switch-on probes. More importantly, upon binding to G-quadruplexes they display a selective and distinct lengthening of their emission lifetime. We show that this effect can be used to selectively visualise these structures in cells using Phosphorescence Lifetime Imaging Microscopy (PLIM).
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Affiliation(s)
- Jessica Berrones Reyes
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Peter S. Sherin
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Amrita Sarkar
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Marina K. Kuimova
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
| | - Ramon Vilar
- Department of ChemistryImperial College LondonWhite City Campus82 Wood LaneLondonW12 0BZUK
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6
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Paez-Perez M, Dent MR, Brooks NJ, Kuimova MK. Viscosity-Sensitive Membrane Dyes as Tools To Estimate the Crystalline Structure of Lipid Bilayers. Anal Chem 2023; 95:12006-12014. [PMID: 37526607 PMCID: PMC10433245 DOI: 10.1021/acs.analchem.3c01747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 07/12/2023] [Indexed: 08/02/2023]
Abstract
Lipid membranes are crucial for cellular integrity and regulation, and tight control of their structural and mechanical properties is vital to ensure that they function properly. Fluorescent probes sensitive to the membrane's microenvironment are useful for investigating lipid membrane properties; however, there is currently a lack of quantitative correlation between the exact parameters of lipid organization and a readout from these dyes. Here, we investigate this relationship for "molecular rotors", or microviscosity sensors, by simultaneously measuring their fluorescence lifetime to determine the membrane viscosity, while using X-ray diffraction to determine the membrane's structural properties. Our results reveal a phase-dependent correlation between the membrane's structural parameters and mechanical properties measured by a BODIPY-based molecular rotor, giving excellent predictive power for the structural descriptors of the lipid bilayer. We also demonstrate that differences in membrane thickness between different lipid phases are not a prerequisite for the formation of lipid microdomains and that this requirement can be disrupted by the presence of line-active molecules. Our results underpin the use of membrane-sensitive dyes as reporters of the structure of lipid membranes.
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Affiliation(s)
- Miguel Paez-Perez
- MSRH, Department of Chemistry, Imperial College London, Wood Lane, London W12 0BZ, U.K.
| | - Michael R. Dent
- MSRH, Department of Chemistry, Imperial College London, Wood Lane, London W12 0BZ, U.K.
| | - Nicholas J. Brooks
- MSRH, Department of Chemistry, Imperial College London, Wood Lane, London W12 0BZ, U.K.
| | - Marina K. Kuimova
- MSRH, Department of Chemistry, Imperial College London, Wood Lane, London W12 0BZ, U.K.
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7
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Shimolina L, Gulin A, Khlynova A, Ignatova N, Druzhkova I, Gubina M, Zagaynova E, Kuimova MK, Shirmanova M. Effects of Paclitaxel on Plasma Membrane Microviscosity and Lipid Composition in Cancer Cells. Int J Mol Sci 2023; 24:12186. [PMID: 37569560 PMCID: PMC10419023 DOI: 10.3390/ijms241512186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/22/2023] [Accepted: 07/26/2023] [Indexed: 08/13/2023] Open
Abstract
The cell membrane is an important regulator for the cytotoxicity of chemotherapeutic agents. However, the biochemical and biophysical effects that occur in the membrane under the action of chemotherapy drugs are not fully described. In the present study, changes in the microviscosity of membranes of living HeLa-Kyoto tumor cells were studied during chemotherapy with paclitaxel, a widely used antimicrotubule agent. To visualize the microviscosity of the membranes, fluorescence lifetime imaging microscopy (FLIM) with a BODIPY 2 fluorescent molecular rotor was used. The lipid profile of the membranes was assessed using time-of-flight secondary ion mass spectrometry ToF-SIMS. A significant, steady-state decrease in the microviscosity of membranes, both in cell monolayers and in tumor spheroids, was revealed after the treatment. Mass spectrometry showed an increase in the unsaturated fatty acid content in treated cell membranes, which may explain, at least partially, their low microviscosity. These results indicate the involvement of membrane microviscosity in the response of tumor cells to paclitaxel treatment.
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Affiliation(s)
- Liubov Shimolina
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (A.K.); (N.I.); (I.D.)
| | - Alexander Gulin
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Kosygin st. 4, 119991 Moscow, Russia; (A.G.); (M.G.)
| | - Alexandra Khlynova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (A.K.); (N.I.); (I.D.)
| | - Nadezhda Ignatova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (A.K.); (N.I.); (I.D.)
| | - Irina Druzhkova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (A.K.); (N.I.); (I.D.)
| | - Margarita Gubina
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Kosygin st. 4, 119991 Moscow, Russia; (A.G.); (M.G.)
| | - Elena Zagaynova
- Lopukhin Federal Research and Clinical Center of Physical-Chemical Medicine, Federal Medical Biological Agency, Malaya Pirogovskaya, 1a, 119435 Moscow, Russia;
| | - Marina K. Kuimova
- Department of Chemistry, Imperial College London (White City Campus), London W12 0BZ, UK;
| | - Marina Shirmanova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (A.K.); (N.I.); (I.D.)
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8
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Kench T, Rakers V, Bouzada D, Gomez-González J, Robinson J, Kuimova MK, Vázquez López M, Vázquez ME, Vilar R. Dimeric Metal-Salphen Complexes Which Target Multimeric G-Quadruplex DNA. Bioconjug Chem 2023; 34:911-921. [PMID: 37119235 DOI: 10.1021/acs.bioconjchem.3c00114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
G-Quadruplex DNA structures have attracted increasing attention due to their biological roles and potential as targets for the development of new drugs. While most guanine-rich sequences in the genome have the potential to form monomeric G-quadruplexes, certain sequences have enough guanine-tracks to give rise to multimeric quadruplexes. One of these sequences is the human telomere where tandem repeats of TTAGGG can lead to the formation of two or more adjacent G-quadruplexes. Herein we report on the modular synthesis via click chemistry of dimeric metal-salphen complexes (with NiII and PtII) bridged by either polyether or peptide linkers. We show by circular dichroism (CD) spectroscopy that they generally have higher selectivity for dimeric vs monomeric G-quadruplexes. The emissive properties of the PtII-salphen dimeric complexes have been used to study their interactions with monomeric and dimeric G-quadruplexes in vitro as well as to study their cellular uptake and localization.
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Affiliation(s)
- Timothy Kench
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, United Kingdom
| | - Viktoria Rakers
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, United Kingdom
| | - David Bouzada
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Jacobo Gomez-González
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Jenna Robinson
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, United Kingdom
| | - Marina K Kuimova
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, United Kingdom
| | - Miguel Vázquez López
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - M Eugenio Vázquez
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Ramon Vilar
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London W12 0BZ, United Kingdom
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9
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Chambers JE, Zubkov N, Kubánková M, Nixon-Abell J, Mela I, Abreu S, Schwiening M, Lavarda G, López-Duarte I, Dickens JA, Torres T, Kaminski CF, Holt LJ, Avezov E, Huntington JA, George-Hyslop PS, Kuimova MK, Marciniak SJ. Z-α 1-antitrypsin polymers impose molecular filtration in the endoplasmic reticulum after undergoing phase transition to a solid state. Sci Adv 2022; 8:eabm2094. [PMID: 35394846 PMCID: PMC8993113 DOI: 10.1126/sciadv.abm2094] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 02/16/2022] [Indexed: 05/06/2023]
Abstract
Misfolding of secretory proteins in the endoplasmic reticulum (ER) features in many human diseases. In α1-antitrypsin deficiency, the pathogenic Z variant aberrantly assembles into polymers in the hepatocyte ER, leading to cirrhosis. We show that α1-antitrypsin polymers undergo a liquid:solid phase transition, forming a protein matrix that retards mobility of ER proteins by size-dependent molecular filtration. The Z-α1-antitrypsin phase transition is promoted during ER stress by an ATF6-mediated unfolded protein response. Furthermore, the ER chaperone calreticulin promotes Z-α1-antitrypsin solidification and increases protein matrix stiffness. Single-particle tracking reveals that solidification initiates in cells with normal ER morphology, previously assumed to represent a healthy pool. We show that Z-α1-antitrypsin-induced hypersensitivity to ER stress can be explained by immobilization of ER chaperones within the polymer matrix. This previously unidentified mechanism of ER dysfunction provides a template for understanding a diverse group of related proteinopathies and identifies ER chaperones as potential therapeutic targets.
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Affiliation(s)
- Joseph E. Chambers
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Nikita Zubkov
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Markéta Kubánková
- Department of Chemistry, Imperial College London, Wood Lane, London W12 0BZ, UK
| | - Jonathon Nixon-Abell
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Ioanna Mela
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK
| | - Susana Abreu
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Max Schwiening
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Giulia Lavarda
- Departamento de Química Orgánica and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Ismael López-Duarte
- Departamento de Química Orgánica and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Jennifer A. Dickens
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Tomás Torres
- Departamento de Química Orgánica and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
- IMDEA Nanociencia, Campus de Cantoblanco, Madrid 28049, Spain
| | - Clemens F. Kaminski
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, UK
| | - Liam J. Holt
- Institute for Systems Genetics, New York University Grossman School of Medicine, 435 E 30th St, New York, NY 10016, USA
| | - Edward Avezov
- Department of Clinical Neurosciences and UK Dementia Research Institute, University of Cambridge, Cambridge CB2 0AH, UK
| | - James A. Huntington
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
| | - Peter St George-Hyslop
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
- Department of Medicine (Neurology), Temerty Faculty of Medicine, University of Toronto, University Health Network, Toronto, ON M5T 0S8, Canada
- Taub Institute For Research on Alzheimer’s Disease and the Ageing Brain, Department of Neurology, Columbia University Irvine Medical Center, 630 West 1/68 Street, New York, NY 10032, USA
| | - Marina K. Kuimova
- Department of Chemistry, Imperial College London, Wood Lane, London W12 0BZ, UK
| | - Stefan J. Marciniak
- Cambridge Institute for Medical Research (CIMR), Department of Medicine, University of Cambridge, The Keith Peters Building, Hills Road, Cambridge CB2 0XY, UK
- Royal Papworth Hospital, Cambridge CB2 0AY, UK
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10
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Hoyas Pérez N, Sherin PS, Posligua V, Greenfield JL, Fuchter MJ, Jelfs KE, Kuimova MK, Lewis JEM. Emerging properties from mechanical tethering within a post-synthetically functionalised catenane scaffold. Chem Sci 2022; 13:11368-11375. [DOI: 10.1039/d2sc04101d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 09/06/2022] [Indexed: 11/21/2022] Open
Abstract
Using a post-synthetic modification strategy we have prepared a series of functionalised [2]catenanes to study the impact of mechanically-enforced proximity on functional group properties, including emission, electrochemistry and photoreactivity.
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Affiliation(s)
- Nadia Hoyas Pérez
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - Peter S. Sherin
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - Victor Posligua
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - Jake L. Greenfield
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - Matthew J. Fuchter
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - Kim E. Jelfs
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - Marina K. Kuimova
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
| | - James E. M. Lewis
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, 82 Wood Lane, London W12 0BZ, UK
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11
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Shimolina L, Gulin A, Ignatova N, Druzhkova I, Gubina M, Lukina M, Snopova L, Zagaynova E, Kuimova MK, Shirmanova M. The Role of Plasma Membrane Viscosity in the Response and Resistance of Cancer Cells to Oxaliplatin. Cancers (Basel) 2021; 13:cancers13246165. [PMID: 34944789 PMCID: PMC8699340 DOI: 10.3390/cancers13246165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/19/2021] [Accepted: 11/30/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Understanding the role of the plasma membrane in the responses of cancer cells to chemotherapy is important because the cell membrane is directly involved in drug transport and the regulation of numerous biological processes. However, the role of the plasma membrane in cell resistance to platinum drugs like oxaliplatin is not fully understood. In this study we identified the changes to plasma membrane viscosity and lipid composition induced by oxaliplatin in responsive, cultured cancer cells and in mouse tumors. It was also found that the acquisition of chemoresistance is accompanied by modification of membrane lipids in ways that preserve the viscous properties unchanged upon further treatment. Therefore, new therapeutic approaches could be developed to reverse chemoresistance based on membrane lipid modifications and the de-stabilisation of membrane viscosity. Abstract Maintenance of the biophysical properties of membranes is essential for cell survival upon external perturbations. However, the links between a fluid membrane state and the drug resistance of cancer cells remain elusive. Here, we investigated the role of membrane viscosity and lipid composition in the responses of cancer cells to oxaliplatin and the development of chemoresistance. Plasma membrane viscosity was monitored in live colorectal cancer cells and tumor xenografts using two-photon excited fluorescence lifetime imaging microscopy (FLIM) using the fluorescent molecular rotor BODIPY 2. The lipid profile was analyzed using time-of-flight secondary ion mass spectrometry (ToF-SIMS). It was found that the plasma membrane viscosity increased upon oxaliplatin treatment, both in vitro and in vivo, and that this correlated with lower phosphatidylcholine and higher cholesterol content. The emergence of resistance to oxaliplatin was accompanied by homeostatic adaptation of the membrane lipidome, and the recovery of lower viscosity. These results suggest that maintaining a constant plasma membrane viscosity via remodeling of the lipid profile is crucial for drug resistance in cancer.
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Affiliation(s)
- Liubov Shimolina
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (I.D.); (M.L.); (L.S.)
- Institute of Biology and Biomedicine, Nizhny Novgorod State University, Gagarin Avenue 23, 603950 Nizhny Novgorod, Russia;
| | - Alexander Gulin
- The Semenov Institute of Chemical Physics of Russian Academy of Sciences (RAS), Kosygina Str. 4, 117977 Moscow, Russia; (A.G.); (M.G.)
| | - Nadezhda Ignatova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (I.D.); (M.L.); (L.S.)
| | - Irina Druzhkova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (I.D.); (M.L.); (L.S.)
| | - Margarita Gubina
- The Semenov Institute of Chemical Physics of Russian Academy of Sciences (RAS), Kosygina Str. 4, 117977 Moscow, Russia; (A.G.); (M.G.)
| | - Maria Lukina
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (I.D.); (M.L.); (L.S.)
| | - Ludmila Snopova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (I.D.); (M.L.); (L.S.)
| | - Elena Zagaynova
- Institute of Biology and Biomedicine, Nizhny Novgorod State University, Gagarin Avenue 23, 603950 Nizhny Novgorod, Russia;
| | - Marina K. Kuimova
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, South Kensington, London SW7 2AZ, UK;
| | - Marina Shirmanova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University, Minin and Pozharsky Square, 10/1, 603005 Nizhny Novgorod, Russia; (L.S.); (N.I.); (I.D.); (M.L.); (L.S.)
- Correspondence:
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12
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Summers PA, Thomas AP, Kench T, Vannier JB, Kuimova MK, Vilar R. Cationic helicenes as selective G4 DNA binders and optical probes for cellular imaging. Chem Sci 2021; 12:14624-14634. [PMID: 34881015 PMCID: PMC8580066 DOI: 10.1039/d1sc04567a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Accepted: 10/12/2021] [Indexed: 01/17/2023] Open
Abstract
The important role that G-quadruplex DNA (G4 DNA) structures play in regulating biological processes is becoming widely recognised. These structures have also been proposed to be attractive drug targets. Therefore, there has been significant interest in developing small molecules that can selectively bind to G4 DNA over other topologies. In this paper we investigate the interaction between DNA and helical compounds (helicenes) based on a central carbocation trisubstituted with aromatic rings. We show that the non-planar structure of these helicenes results in a significantly reduced affinity for dsDNA when compared to their planar analogues, whilst maintaining a high affinity for G4 DNA. Additionally, the right- and left-handed enantiomers of one of these helicenes recognise the chiral DNA environments of G4 and dsDNA differently. We show that upon DNA binding the helicenes display a fluorescence switch-on effect, which we have successfully used for cellular imaging in live and fixed U2OS cells, staining mitochondria and the nucleus, respectively.
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Affiliation(s)
- Peter A Summers
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London 82 Wood Lane, White City Campus W12 0BZ UK +44 (0)20 7594 1967 +44 (0)20 7594 8558
| | - Ajesh P Thomas
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London 82 Wood Lane, White City Campus W12 0BZ UK +44 (0)20 7594 1967 +44 (0)20 7594 8558
| | - Timothy Kench
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London 82 Wood Lane, White City Campus W12 0BZ UK +44 (0)20 7594 1967 +44 (0)20 7594 8558
| | - Jean-Baptiste Vannier
- Telomere Replication and Stability Group, Medical Research Council - London Institute of Medical Sciences London W12 0NN UK
- Institute of Clinical Sciences, Faculty of Medicine, Imperial College London London W12 0NN UK
| | - Marina K Kuimova
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London 82 Wood Lane, White City Campus W12 0BZ UK +44 (0)20 7594 1967 +44 (0)20 7594 8558
| | - Ramon Vilar
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London 82 Wood Lane, White City Campus W12 0BZ UK +44 (0)20 7594 1967 +44 (0)20 7594 8558
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13
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McTiernan CD, Zuñiga-Bustos M, Rosales-Rojas R, Barrias P, Griffith M, Poblete H, Sherin PS, López-Duarte I, Kuimova MK, Alarcon EI. Molecular rotors as reporters for viscosity of solutions of collagen like peptides. Phys Chem Chem Phys 2021; 23:24545-24549. [PMID: 34704576 DOI: 10.1039/d1cp04398f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied the suitability of using a molecular rotor-based steady-state fluorometric assay for evaluating changes in both the conformation and the viscosity of collagen-like peptide solutions. Our results indicate that a positive charge incorporated on the hydrophobic tail of the BODIPY molecular rotor favours the dye specificity as a reporter for viscosity of these solutions.
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Affiliation(s)
- Christopher D McTiernan
- Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Canada.
| | - Matias Zuñiga-Bustos
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, Campus Talca, 1 Poniente No. 1141, Casilla 721, Talca, Chile
| | - Roberto Rosales-Rojas
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, Campus Talca, 1 Poniente No. 1141, Casilla 721, Talca, Chile.,Doctorado en ciencias Mención Modelado de Sistemas Químicos y Biológicos, Facultad de Ingeniería, Universidad de Talca, Campus Talca, 1 Poniente No. 1141, Casilla 721, Talca, Chile
| | - Pablo Barrias
- Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago, Chile
| | - May Griffith
- Centre de Recherche Hôpital Maisonneuve-Rosemont, Montréal, QC, Canada.,Département d'ophtalmologie, Université de Montréal, Montréal, QC, Canada
| | - Horacio Poblete
- Departamento de Bioinformática, Centro de Bioinformática, Simulación y Modelado (CBSM), Facultad de Ingeniería, Universidad de Talca, Campus Talca, 1 Poniente No. 1141, Casilla 721, Talca, Chile.,Millennium Nucleus of Ion Channels-Associated Diseases (MiNICAD), Universidad de Talca, Talca, Chile
| | - Peter S Sherin
- Chemistry Department, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, London W12 0BZ, UK
| | - Ismael López-Duarte
- Chemistry Department, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, London W12 0BZ, UK
| | - Marina K Kuimova
- Chemistry Department, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, London W12 0BZ, UK
| | - Emilio I Alarcon
- Division of Cardiac Surgery, University of Ottawa Heart Institute, 40 Ruskin Street, Ottawa, Canada. .,Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, Canada
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14
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Sherin PS, Vyšniauskas A, López-Duarte I, Ogilby PR, Kuimova MK. Visualising UV-A light-induced damage to plasma membranes of eye lens. J Photochem Photobiol B 2021; 225:112346. [PMID: 34736070 DOI: 10.1016/j.jphotobiol.2021.112346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/01/2021] [Accepted: 10/19/2021] [Indexed: 01/16/2023]
Abstract
An eye lens is constantly exposed to the solar UV radiation, which is considered the most important external source of age-related changes to eye lens constituents. The accumulation of modifications of proteins and lipids with age can eventually lead to the development of progressive lens opacifications, such as cataracts. Though the impact of solar UV radiation on the structure and function of proteins is actively studied, little is known about the effect of photodamage on plasma membranes of lens cells. In this work we exploit Fluorescence Lifetime Imaging Microscopy (FLIM), together with viscosity-sensitive fluorophores termed molecular rotors, to study the changes in viscosity of plasma membranes of porcine eye lens resulting from two different types of photodamage: Type I (electron transfer) and Type II (singlet oxygen) reactions. We demonstrate that these two types of photodamage result in clearly distinct changes in viscosity - a decrease in the case of Type I damage and an increase in the case of Type II processes. Finally, to simulate age-related changes that occur in vivo, we expose an intact eye lens to UV-A light under anaerobic conditions. The observed decrease in viscosity within plasma membranes is consistent with the ability of eye lens constituents to sensitize Type I photodamage under natural irradiation conditions. These changes are likely to alter the transport of metabolites and predispose the whole tissue to the development of pathological processes such as cataracts.
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Affiliation(s)
- Peter S Sherin
- Chemistry Department, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, London W12 0BZ, UK; International Tomography Center SB RAS, Institutskaya street 3A, Novosibirsk 630090, Russia.
| | - Aurimas Vyšniauskas
- Center for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius LT-10257, Lithuania; Chemistry Department, Vilnius University, Naugarduko st. 24, Vilnius LT-03225, Lithuania
| | - Ismael López-Duarte
- Chemistry Department, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, London W12 0BZ, UK
| | - Peter R Ogilby
- Department of Chemistry, Aarhus University, Langelandsgade 140, Aarhus DK-8000, Denmark
| | - Marina K Kuimova
- Chemistry Department, Molecular Sciences Research Hub, Imperial College London, 82 Wood Lane, London W12 0BZ, UK.
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15
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Priessner M, Summers PA, Lewis BW, Sastre M, Ying L, Kuimova MK, Vilar R. Selective Detection of Cu
+
Ions in Live Cells via Fluorescence Lifetime Imaging Microscopy. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Martin Priessner
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Peter A. Summers
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Benjamin W. Lewis
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Magdalena Sastre
- Department of Brain Sciences Imperial College London Hammersmith Campus London W12 0NN UK
| | - Liming Ying
- National Heart and Lung Institute Molecular Sciences Research Hub White City Campus Imperial College London London W12 0BZ UK
| | - Marina K. Kuimova
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Ramon Vilar
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
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16
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Priessner M, Summers PA, Lewis BW, Sastre M, Ying L, Kuimova MK, Vilar R. Selective Detection of Cu + Ions in Live Cells via Fluorescence Lifetime Imaging Microscopy. Angew Chem Int Ed Engl 2021; 60:23148-23153. [PMID: 34379368 PMCID: PMC8596571 DOI: 10.1002/anie.202109349] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Indexed: 11/06/2022]
Abstract
Copper is an essential trace element in living organisms with its levels and localisation being carefully managed by the cellular machinery. However, if misregulated, deficiency or excess of copper ions can lead to several diseases. Therefore, it is important to have reliable methods to detect, monitor and visualise this metal in cells. Herein we report a new optical probe based on BODIPY, which shows a switch-on in its fluorescence intensity upon binding to copper(I), but not in the presence of high concentration of other physiologically relevant metal ions. More interestingly, binding to copper(I) leads to significant changes in the fluorescence lifetime of the new probe, which can be used to visualize copper(I) pools in lysosomes of live cells via fluorescence lifetime imaging microscopy (FLIM).
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Affiliation(s)
- Martin Priessner
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Peter A. Summers
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Benjamin W. Lewis
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Magdalena Sastre
- Department of Brain SciencesImperial College LondonHammersmith CampusLondonW12 0NNUK
| | - Liming Ying
- National Heart and Lung InstituteMolecular Sciences Research HubWhite City CampusImperial College LondonLondonW12 0BZUK
| | - Marina K. Kuimova
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
| | - Ramon Vilar
- Department of ChemistryImperial College LondonWhite City CampusLondonW12 0BZUK
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17
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Shimolina L, Lukina M, Shcheslavskiy V, Elagin V, Dudenkova V, Ignatova N, Kuimova MK, Shirmanova M. Probing Metabolism and Viscosity of Cancer Cells using Fluorescence Lifetime Imaging Microscopy. J Vis Exp 2021. [PMID: 34398152 DOI: 10.3791/62708] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Viscosity is an important physical property of a biological membrane, as it is one of the key parameters for the regulation of morphological and physiological state of living cells. Plasma membranes of tumor cells are known to have significant alterations in their composition, structure, and functional characteristics. Along with dysregulated metabolism of glucose and lipids, these specific membrane properties help tumor cells to adapt to the hostile microenvironment and develop resistance to drug therapies. Here, we demonstrate the use of fluorescence lifetime imaging microscopy (FLIM) to sequentially image cellular metabolism and plasma membrane viscosity in live cancer cell culture. Metabolic assessments are performed by detecting fluorescence of endogenous metabolic cofactors, such as reduced nicotinamide adenine dinucleotide NAD(P)H and oxidized flavins. Viscosity is measured using a fluorescent molecular rotor, a synthetic viscosity-sensitive dye, with a strong fluorescence lifetime dependence on the viscosity of the immediate environment. In combination, these techniques enable us to better understand the links between membrane state and metabolic profile of cancer cells and to visualize the changes induced by chemotherapy.
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Affiliation(s)
- Liubov Shimolina
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University
| | - Maria Lukina
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University
| | - Vladislav Shcheslavskiy
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University; Becker & Hickl GmbH
| | - Vadim Elagin
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University
| | - Varvara Dudenkova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University
| | - Nadezhda Ignatova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University
| | | | - Marina Shirmanova
- Institute of Experimental Oncology and Biomedical Technologies, Privolzhsky Research Medical University;
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18
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Vyšniauskas A, Cornell B, Sherin PS, Maleckaitė K, Kubánková M, Izquierdo MA, Vu TT, Volkova YA, Budynina EM, Molteni C, Kuimova MK. Cyclopropyl Substituents Transform the Viscosity-Sensitive BODIPY Molecular Rotor into a Temperature Sensor. ACS Sens 2021; 6:2158-2167. [PMID: 34060823 DOI: 10.1021/acssensors.0c02275] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A quantitative fluorescent probe that responds to changes in temperature is highly desirable for studies of biological environments, particularly in cellulo. Here, we report new cell-permeable fluorescence probes based on the BODIPY moiety that respond to environmental temperature. The new probes were developed on the basis of a well-established BODIPY-based viscosity probe by functionalization with cyclopropyl substituents at α and β positions of the BODIPY core. In contrast to the parent BODIPY fluorophore, α-cyclopropyl-substituted fluorophore displays temperature-dependent time-resolved fluorescence decays showing greatly diminished viscosity dependence, making it an attractive sensor to be used with fluorescence lifetime imaging microscopy (FLIM). We performed theoretical calculations that help rationalize the effect of the cyclopropyl substituents on the photophysical behavior of the new BODIPYs. In summary, we designed an attractive new quantitative FLIM-based temperature probe that can be used for temperature sensing in live cells.
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Affiliation(s)
- Aurimas Vyšniauskas
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius 10257, Lithuania
| | - Bethan Cornell
- Physics Department, King’s College London, Strand, London WC2R 2LS, U.K
| | - Peter S. Sherin
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
| | - Karolina Maleckaitė
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius 10257, Lithuania
| | - Markéta Kubánková
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
| | - Maria Angeles Izquierdo
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
| | - Thanh Truc Vu
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
| | - Yulia A. Volkova
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky pr. 47, Moscow 119991, Russia
| | - Ekaterina M. Budynina
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
- Department of Chemistry, Lomonosov Moscow State University, Leninskie gory 1-3, Moscow 119991, Russia
| | - Carla Molteni
- Physics Department, King’s College London, Strand, London WC2R 2LS, U.K
| | - Marina K. Kuimova
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, Exhibition Road, London W12 0BZ, U.K
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19
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Kench T, Summers PA, Kuimova MK, Lewis JEM, Vilar R. Rotaxanes as Cages to Control DNA Binding, Cytotoxicity, and Cellular Uptake of a Small Molecule*. Angew Chem Int Ed Engl 2021; 60:10928-10934. [PMID: 33577711 DOI: 10.1002/anie.202100151] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 02/08/2021] [Indexed: 11/08/2022]
Abstract
The efficacy of many drugs can be limited by undesirable properties, such as poor aqueous solubility, low bioavailability, and "off-target" interactions. To combat this, various drug carriers have been investigated to enhance the pharmacological profile of therapeutic agents. In this work, we demonstrate the use of mechanical protection to "cage" a DNA-targeting metallodrug within a photodegradable rotaxane. More specifically, we report the synthesis of rotaxanes incorporating as a stoppering unit a known G-quadruplex DNA binder, namely a PtII -salphen complex. This compound cannot interact with DNA when it is part of the mechanically interlocked assembly. The second rotaxane stopper can be cleaved by either light or an esterase, releasing the PtII -salphen complex. This system shows enhanced cell permeability and limited cytotoxicity within osteosarcoma cells compared to the free drug. Light activation leads to a dramatic increase in cytotoxicity, arising from the translocation of PtII -salphen to the nucleus and its binding to DNA.
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Affiliation(s)
- Timothy Kench
- Department of Chemistry, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Peter A Summers
- Department of Chemistry, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Marina K Kuimova
- Department of Chemistry, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - James E M Lewis
- Department of Chemistry, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Ramon Vilar
- Department of Chemistry, Imperial College London, White City Campus, London, W12 0BZ, UK
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20
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Kench T, Summers PA, Kuimova MK, Lewis JEM, Vilar R. Rotaxanes as Cages to Control DNA Binding, Cytotoxicity, and Cellular Uptake of a Small Molecule**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Timothy Kench
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Peter A. Summers
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Marina K. Kuimova
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - James E. M. Lewis
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
| | - Ramon Vilar
- Department of Chemistry Imperial College London White City Campus London W12 0BZ UK
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21
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Berrones Reyes J, Kuimova MK, Vilar R. Metal complexes as optical probes for DNA sensing and imaging. Curr Opin Chem Biol 2021; 61:179-190. [PMID: 33784589 DOI: 10.1016/j.cbpa.2021.02.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 02/17/2021] [Accepted: 02/18/2021] [Indexed: 12/13/2022]
Abstract
Transition and lanthanide metal complexes have rich photophysical properties that can be used for cellular imaging, biosensing and phototherapy. One of the applications of such luminescent compounds is the detection and visualisation of nucleic acids. In this brief review, we survey the recent literature on the use of luminescent metal complexes (including ReI, RuII, OsII, IrIII, PtII, EuIII and TbIII) as DNA optical probes, including examples of compounds that bind selectively to non-duplex DNA topologies such as quadruplex, i-motif and DNA mismatches. We discuss the applications of metal-based luminescent complexes in cellular imaging, including time-resolved microscopy and super-resolution techniques. Their applications in biosensing and phototherapy are briefly mentioned in the relevant sections.
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Affiliation(s)
- Jessica Berrones Reyes
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London, W12 0BZ, UK
| | - Marina K Kuimova
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London, W12 0BZ, UK
| | - Ramon Vilar
- Department of Chemistry, Imperial College London, White City Campus, 82 Wood Lane, London, W12 0BZ, UK.
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22
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Lewis BW, Bisballe N, Santella M, Summers PA, Vannier JB, Kuimova MK, Laursen BW, Vilar R. Assessing The Key Photophysical Properties of Triangulenium Dyes for DNA Binding by Alteration of the Fluorescent Core. Chemistry 2021; 27:2523-2536. [PMID: 33105523 DOI: 10.1002/chem.202003875] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Indexed: 11/09/2022]
Abstract
Four-stranded G-quadruplex (G4) DNA is a non-canonical DNA topology that has been proposed to form in cells and play key roles in how the genome is read and used by the cellular machinery. Previously, a fluorescent triangulenium probe (DAOTA-M2) was used to visualise G4s in cellulo, thanks to its distinct fluorescence lifetimes when bound to different DNA topologies. Herein, the library of available triangulenium probes is expanded to explore how modifications to the fluorescent core of the molecule affect its photophysical characteristics, interaction with DNA and cellular localisation. The benzo-bridged and isopropyl-bridged diazatriangulenium dyes, BDATA-M2 and CDATA-M2 respectively, featuring ethyl-morpholino substituents, were synthesised and characterised. The interactions of these molecules with different DNA topologies were studied to determine their binding affinity, fluorescence enhancement and fluorescence lifetime response. Finally, the cellular uptake and localisation of these optical probes were investigated. Whilst structural modifications to the triangulenium core only slightly alter the binding affinity to DNA, BDATA-M2 and CDATA-M2 cannot distinguish between DNA topologies through their fluorescence lifetime. It is argued theoretically and experimentally that this is due to reduced effectiveness of photoinduced electron transfer (PET) quenching. This work presents valuable new evidence into the critical role of PET quenching when using the fluorescence lifetime of triangulenium dyes to discriminate G4 DNA from duplex DNA, highlighting the importance of fine tuning redox and spectral properties when developing new triangulenium-based G4 probes.
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Affiliation(s)
- Benjamin W Lewis
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, London, W12 0BZ, UK.,Institute of Chemical Biology, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Niels Bisballe
- Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Marco Santella
- Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Peter A Summers
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Jean-Baptiste Vannier
- Telomere Replication and Stability Group, Medical Research Council-London Institute of Medical Sciences, London, W12 0NN, UK.,Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, London, W12 0NN, UK
| | - Marina K Kuimova
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, London, W12 0BZ, UK.,Institute of Chemical Biology, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Bo W Laursen
- Department of Chemistry & Nano-Science Center, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark
| | - Ramon Vilar
- Department of Chemistry, Molecular Sciences Research Hub, White City Campus, Imperial College London, London, W12 0BZ, UK.,Institute of Chemical Biology, White City Campus, Imperial College London, London, W12 0BZ, UK
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23
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Páez-Pérez M, López-Duarte I, Vyšniauskas A, Brooks NJ, Kuimova MK. Imaging non-classical mechanical responses of lipid membranes using molecular rotors. Chem Sci 2020; 12:2604-2613. [PMID: 34164028 PMCID: PMC8179291 DOI: 10.1039/d0sc05874b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Lipid packing in cellular membranes has a direct effect on membrane tension and microviscosity, and plays a central role in cellular adaptation, homeostasis and disease. According to conventional mechanical descriptions, viscosity and tension are directly interconnected, with increased tension leading to decreased membrane microviscosity. However, the intricate molecular interactions that combine to build the structure and function of a cell membrane suggest a more complex relationship between these parameters. In this work, a viscosity-sensitive fluorophore (‘molecular rotor’) is used to map changes in microviscosity in model membranes under conditions of osmotic stress. Our results suggest that the relationship between membrane tension and microviscosity is strongly influenced by the bilayer's lipid composition. In particular, we show that the effects of increasing tension are minimised for membranes that exhibit liquid disordered (Ld) – liquid ordered (Lo) phase coexistence; while, surprisingly, membranes in pure gel and Lo phases exhibit a negative compressibility behaviour, i.e. they soften upon compression. Viscosity-sensitive molecular rotors demonstrate that the non-classical mechanical behaviour of model lipid membranes is able to buffer external stress.![]()
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Affiliation(s)
- Miguel Páez-Pérez
- MSRH, Department of Chemistry, Imperial College London Wood Lane London W12 0BZ UK
| | - Ismael López-Duarte
- MSRH, Department of Chemistry, Imperial College London Wood Lane London W12 0BZ UK .,Departamento de Química Orgánica, Universidad Autónoma de Madrid Cantoblanco 28049 Madrid Spain
| | - Aurimas Vyšniauskas
- MSRH, Department of Chemistry, Imperial College London Wood Lane London W12 0BZ UK .,Center of Physical Sciences and Technology Saulėtekio av. 3 Vilnius Lithuania
| | - Nicholas J Brooks
- MSRH, Department of Chemistry, Imperial College London Wood Lane London W12 0BZ UK
| | - Marina K Kuimova
- MSRH, Department of Chemistry, Imperial College London Wood Lane London W12 0BZ UK
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24
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Shimolina LE, Gulin AA, Paez-Perez M, López-Duarte I, Druzhkova IN, Lukina MM, Gubina MV, Brooks NJ, Zagaynova EV, Kuimova MK, Shirmanova MV. Mapping cisplatin-induced viscosity alterations in cancer cells using molecular rotor and fluorescence lifetime imaging microscopy. J Biomed Opt 2020; 25:JBO-200248R. [PMID: 33331150 PMCID: PMC7744042 DOI: 10.1117/1.jbo.25.12.126004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 11/16/2020] [Indexed: 06/12/2023]
Abstract
SIGNIFICANCE Despite the importance of the cell membrane in regulation of drug activity, the influence of drug treatments on its physical properties is still poorly understood. The combination of fluorescence lifetime imaging microscopy (FLIM) with specific viscosity-sensitive fluorescent molecular rotors allows the quantification of membrane viscosity with high spatiotemporal resolution, down to the individual cell organelles. AIM The aim of our work was to analyze microviscosity of the plasma membrane of living cancer cells during chemotherapy with cisplatin using FLIM and correlate the observed changes with lipid composition and cell's response to treatment. APPROACH FLIM together with viscosity-sensitive boron dipyrromethene-based fluorescent molecular rotor was used to map the fluidity of the cell's membrane. Chemical analysis of membrane lipid composition was performed with time-of-flight secondary ion mass spectrometry (ToF-SIMS). RESULTS We detected a significant steady increase in membrane viscosity in viable cancer cells, both in cell monolayers and tumor spheroids, upon prolonged treatment with cisplatin, as well as in cisplatin-adapted cell line. ToF-SIMS revealed correlative changes in lipid profile of cisplatin-treated cells. CONCLUSIONS These results suggest an involvement of membrane viscosity in the cell adaptation to the drug and in the acquisition of drug resistance.
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Affiliation(s)
- Liubov E. Shimolina
- Privolzhsky Research Medical University, Institute of Experimental Oncology and Biomedical Technologies, Nizhny Novgorod, Russia
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Alexander A. Gulin
- N.N. Semenov Federal Research Center for Chemical Physics Russian Academy of Sciences, Moscow, Russia
- Lomonosov Moscow State University, Department of Chemistry, Moscow, Russia
| | - Miguel Paez-Perez
- Imperial College London, Faculty of Natural Sciences, Department of Chemistry, London, United Kingdom
| | - Ismael López-Duarte
- Imperial College London, Faculty of Natural Sciences, Department of Chemistry, London, United Kingdom
| | - Irina N. Druzhkova
- Privolzhsky Research Medical University, Institute of Experimental Oncology and Biomedical Technologies, Nizhny Novgorod, Russia
| | - Maria M. Lukina
- Privolzhsky Research Medical University, Institute of Experimental Oncology and Biomedical Technologies, Nizhny Novgorod, Russia
| | - Margarita V. Gubina
- N.N. Semenov Federal Research Center for Chemical Physics Russian Academy of Sciences, Moscow, Russia
- Moscow Institute of Physics and Technology, Dolgoprudny, Russia
| | - Nicolas J. Brooks
- Imperial College London, Faculty of Natural Sciences, Department of Chemistry, London, United Kingdom
| | - Elena V. Zagaynova
- Privolzhsky Research Medical University, Institute of Experimental Oncology and Biomedical Technologies, Nizhny Novgorod, Russia
- Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia
| | - Marina K. Kuimova
- Imperial College London, Faculty of Natural Sciences, Department of Chemistry, London, United Kingdom
| | - Marina V. Shirmanova
- Privolzhsky Research Medical University, Institute of Experimental Oncology and Biomedical Technologies, Nizhny Novgorod, Russia
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25
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Vyšniauskas A, Kuimova MK. Microviscosity and temperature sensors: The twists and turns of the photophysics of conjugated porphyrin dimers — a SPP/JPP Young Investigator Award paper. J PORPHYR PHTHALOCYA 2020. [DOI: 10.1142/s1088424620300050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Conjugated porphyrin dimers have captured the imagination of scientists due to a set of unique spectroscopic features such as remarkable nonlinear-optical properties, high yields of singlet oxygen sensitization and the absorption and emission in the far-red region of the visible spectrum. Here we review a range of newly emerged applications of porphyrin dimers as sensors of their microenvironment such as viscosity and temperature. We discuss the sensing mechanism based on the known conformational flexibility of the dimer structure and describe possible applications of these unique sensors, from detecting viscosity increase during photoinduced cell death to structural responses of polymers and artificial lipid membranes, to temperature changes, and to mechanical deformation.
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Affiliation(s)
- Aurimas Vyšniauskas
- Center of Physical Sciences and Technology, Sauletekio av. 3, Vilnius, LT-10257, Lithuania
- Chemistry Department, Vilnius University, Naugarduko st. 24, Vilnius, LT-03225, Lithuania
| | - Marina K. Kuimova
- Chemistry Department, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, W12 0BZ, UK
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26
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Shi Y, Summers PA, Kuimova MK, Azevedo HS. Unravelling the Enzymatic Degradation Mechanism of Supramolecular Peptide Nanofibers and Its Correlation with Their Internal Viscosity. Nano Lett 2020; 20:7375-7381. [PMID: 32866016 DOI: 10.1021/acs.nanolett.0c02781] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Enzyme-responsive supramolecular peptide biomaterials have attracted growing interest for disease diagnostics and treatments. However, it remains unclear whether enzymes target the peptide assemblies or dissociated peptide monomers. To gain further insight into the degradation mechanism of supramolecular peptide amphiphile (PA) nanofibers, cathepsin B with both exopeptidase and endopeptidase activities was exploited here for degradation studies. Hydrolysis was found to occur directly on the PA nanofibers as only surface amino acid residues were cleaved. The number of cleaved residues and the degradation efficiency was observed to be negatively correlated with the internal viscosity of the PA nanofibers, quantified to be between 200-800 cP (liquid phase) using fluorescence lifetime imaging microscopy combined with an environmentally sensitive molecular rotor, BODIPY-C10. These findings enhance our understanding on the enzymatic degradation of supramolecular PA nanofibers and have important implications for the development of PA probes for the real-time monitoring of disease-related enzymes.
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Affiliation(s)
- Yejiao Shi
- School of Engineering and Materials Science and Institute of Bioengineering, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
| | - Peter A Summers
- Department of Chemistry and Molecular Science Research Hub, Imperial College London, White City Campus, London W12 0BZ, United Kingdom
| | - Marina K Kuimova
- Department of Chemistry and Molecular Science Research Hub, Imperial College London, White City Campus, London W12 0BZ, United Kingdom
| | - Helena S Azevedo
- School of Engineering and Materials Science and Institute of Bioengineering, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom
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27
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Maurice J, Lett AM, Skinner C, Lim A, Richardson M, Thomas AP, Summers PA, Vyas K, Tadbier AW, Vilar R, Kuimova MK, Miodragovic S, Vergis N, Kelly P, Cordeiro MF, Hoare J, Darzi A, Goldin R, Thursz M, Thompson AJ. Transcutaneous fluorescence spectroscopy as a tool for non-invasive monitoring of gut function: first clinical experiences. Sci Rep 2020; 10:16169. [PMID: 32999336 PMCID: PMC7527451 DOI: 10.1038/s41598-020-73149-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 09/10/2020] [Indexed: 01/27/2023] Open
Abstract
Gastro-intestinal function plays a vital role in conditions ranging from inflammatory bowel disease and HIV through to sepsis and malnutrition. However, the techniques that are currently used to assess gut function are either highly invasive or unreliable. Here we present an alternative, non-invasive sensing modality for assessment of gut function based on fluorescence spectroscopy. In this approach, patients receive an oral dose of a fluorescent contrast agent and a fibre-optic probe is used to make fluorescence measurements through the skin. This provides a readout of the degree to which fluorescent dyes have permeated from the gut into the blood stream. We present preliminary results from our first measurements in human volunteers demonstrating the potential of the technique for non-invasive monitoring of multiple aspects of gastro-intestinal health.
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Affiliation(s)
- James Maurice
- Department of Surgery & Cancer, St. Mary's Hospital Campus, Imperial College London, London, W2 1NY, UK
| | - Aaron M Lett
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, W2 1NY, UK
| | - Charlotte Skinner
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, W2 1NY, UK
| | - Alexandra Lim
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, W2 1NY, UK
| | - Matthew Richardson
- Imperial College Ophthalmology Research Group, Western Eye Hospital, Imperial College London, London, NW1 5QH, UK
| | - Ajesh Painadath Thomas
- Department of Chemistry, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Peter A Summers
- Department of Chemistry, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Khushi Vyas
- The Hamlyn Centre, Institute of Global Health Innovation, South Kensington, Imperial College London, London, SW7 2AZ, UK
| | - Abdul Wadood Tadbier
- Department of Surgery & Cancer, St. Mary's Hospital Campus, Imperial College London, London, W2 1NY, UK.,The Hamlyn Centre, Institute of Global Health Innovation, South Kensington, Imperial College London, London, SW7 2AZ, UK
| | - Ramon Vilar
- Department of Chemistry, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Marina K Kuimova
- Department of Chemistry, White City Campus, Imperial College London, London, W12 0BZ, UK
| | - Serge Miodragovic
- Imperial College Ophthalmology Research Group, Western Eye Hospital, Imperial College London, London, NW1 5QH, UK
| | - Nikhil Vergis
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, W2 1NY, UK
| | - Paul Kelly
- Blizard Institute, Queen Mary University of London, London, E1 2AT, UK.,Tropical Gastroenterology and Nutrition Group, University of Zambia School of Medicine, Lusaka, Zambia
| | - Maria Francesca Cordeiro
- Imperial College Ophthalmology Research Group, Western Eye Hospital, Imperial College London, London, NW1 5QH, UK
| | - Jonathan Hoare
- Department of Surgery & Cancer, St. Mary's Hospital Campus, Imperial College London, London, W2 1NY, UK
| | - Ara Darzi
- Department of Surgery & Cancer, St. Mary's Hospital Campus, Imperial College London, London, W2 1NY, UK.,The Hamlyn Centre, Institute of Global Health Innovation, South Kensington, Imperial College London, London, SW7 2AZ, UK
| | - Robert Goldin
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, W2 1NY, UK
| | - Mark Thursz
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, W2 1NY, UK
| | - Alex J Thompson
- Department of Surgery & Cancer, St. Mary's Hospital Campus, Imperial College London, London, W2 1NY, UK. .,The Hamlyn Centre, Institute of Global Health Innovation, South Kensington, Imperial College London, London, SW7 2AZ, UK.
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28
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Robson JA, Kubánková M, Bond T, Hendley RA, White AJP, Kuimova MK, Wilton‐Ely JDET. Simultaneous Detection of Carbon Monoxide and Viscosity Changes in Cells. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008224] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jonathan A. Robson
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
| | - Markéta Kubánková
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
| | - Tamzin Bond
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
| | - Rian A. Hendley
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
| | - Andrew J. P. White
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
| | - Marina K. Kuimova
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
| | - James D. E. T. Wilton‐Ely
- Department of Chemistry Molecular Sciences Research Hub Imperial College London White City Campus London W12 0BZ UK
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29
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Robson JA, Kubánková M, Bond T, Hendley RA, White AJP, Kuimova MK, Wilton-Ely JDET. Simultaneous Detection of Carbon Monoxide and Viscosity Changes in Cells. Angew Chem Int Ed Engl 2020; 59:21431-21435. [PMID: 32686308 PMCID: PMC7756414 DOI: 10.1002/anie.202008224] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/14/2020] [Indexed: 12/11/2022]
Abstract
A new family of robust, non‐toxic, water‐compatible ruthenium(II) vinyl probes allows the rapid, selective and sensitive detection of endogenous carbon monoxide (CO) in live mammalian cells under normoxic and hypoxic conditions. Uniquely, these probes incorporate a viscosity‐sensitive BODIPY fluorophore that allows the measurement of microscopic viscosity in live cells via fluorescence lifetime imaging microscopy (FLIM) while also monitoring CO levels. This is the first example of a probe that can simultaneously detect CO alongside small viscosity changes in organelles of live cells.
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Affiliation(s)
- Jonathan A Robson
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Markéta Kubánková
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Tamzin Bond
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Rian A Hendley
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Andrew J P White
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - Marina K Kuimova
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
| | - James D E T Wilton-Ely
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, London, W12 0BZ, UK
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30
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Bednarska J, Pelchen-Matthews A, Novak P, Burden JJ, Summers PA, Kuimova MK, Korchev Y, Marsh M, Shevchuk A. Rapid formation of human immunodeficiency virus-like particles. Proc Natl Acad Sci U S A 2020; 117:21637-21646. [PMID: 32817566 PMCID: PMC7474690 DOI: 10.1073/pnas.2008156117] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Understanding the molecular mechanisms involved in the assembly of viruses is essential for discerning how viruses transmit from cell to cell and host to host. Although molecular aspects of assembly have been studied for many viruses, we still have little information about these events in real time. Enveloped viruses such as HIV that assemble at, and bud from, the plasma membrane have been studied in some detail using live cell fluorescence imaging techniques; however, these approaches provide little information about the real-time morphological changes that take place as viral components come together to form individual virus particles. Here we used correlative scanning ion conductance microscopy and fluorescence confocal microscopy to measure the topological changes, together with the recruitment of fluorescently labeled viral proteins such as Gag and Vpr, during the assembly and release of individual HIV virus-like particles (VLPs) from the top, nonadherent surfaces of living cells. We show that 1) labeling of viral proteins with green fluorescent protein affects particle formation, 2) the kinetics of particle assembly on different plasma membrane domains can vary, possibly as a consequence of differences in membrane biophysical properties, and 3) VLPs budding from the top, unimpeded surface of cells can reach full size in 20 s and disappear from the budding site in 0.5 to 3 min from the moment curvature is initially detected, significantly faster than has been previously reported.
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Affiliation(s)
- Joanna Bednarska
- Department of Medicine, Imperial College London, W12 0NN London, United Kingdom
| | - Annegret Pelchen-Matthews
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, WC1E 6BT London, United Kingdom
| | - Pavel Novak
- Department of Medicine, Imperial College London, W12 0NN London, United Kingdom
- Functional Low-Dimensional Structures Laboratory, National University of Science and Technology "MISIS", 119991 Moscow, Russian Federation
| | - Jemima J Burden
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, WC1E 6BT London, United Kingdom
| | - Peter A Summers
- Molecular Sciences Research Hub, Department of Chemistry, Imperial College London, W12 0BZ London, United Kingdom
| | - Marina K Kuimova
- Molecular Sciences Research Hub, Department of Chemistry, Imperial College London, W12 0BZ London, United Kingdom
| | - Yuri Korchev
- Department of Medicine, Imperial College London, W12 0NN London, United Kingdom
- Nano Life Science Institute, Kanazawa University, 920-1192 Kanazawa, Japan
| | - Mark Marsh
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, WC1E 6BT London, United Kingdom;
| | - Andrew Shevchuk
- Department of Medicine, Imperial College London, W12 0NN London, United Kingdom;
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31
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Kashirina AS, López-Duarte I, Kubánková M, Gulin AA, Dudenkova VV, Rodimova SA, Torgomyan HG, Zagaynova EV, Meleshina AV, Kuimova MK. Monitoring membrane viscosity in differentiating stem cells using BODIPY-based molecular rotors and FLIM. Sci Rep 2020; 10:14063. [PMID: 32820221 PMCID: PMC7441180 DOI: 10.1038/s41598-020-70972-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 07/29/2020] [Indexed: 11/09/2022] Open
Abstract
Membrane fluidity plays an important role in many cell functions such as cell adhesion, and migration. In stem cell lines membrane fluidity may play a role in differentiation. Here we report the use of viscosity-sensitive fluorophores based on a BODIPY core, termed “molecular rotors”, in combination with Fluorescence Lifetime Imaging Microscopy, for monitoring of plasma membrane viscosity changes in mesenchymal stem cells (MSCs) during osteogenic and chondrogenic differentiation. In order to correlate the viscosity values with membrane lipid composition, the detailed analysis of the corresponding membrane lipid composition of differentiated cells was performed by time-of-flight secondary ion mass spectrometry. Our results directly demonstrate for the first time that differentiation of MSCs results in distinct membrane viscosities, that reflect the change in lipidome of the cells following differentiation.
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Affiliation(s)
- Alena S Kashirina
- Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Sq., Nizhny Novgorod, Russian Federation, 603950
| | - Ismael López-Duarte
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, London, W12 0BZ, UK
| | - Markéta Kubánková
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, London, W12 0BZ, UK
| | - Alexander A Gulin
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences (FRCCP RAS), Kosygin st. 4, Moscow, Russian Federation, 119991.,Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, Russian Federation, 119991
| | - Varvara V Dudenkova
- Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Sq., Nizhny Novgorod, Russian Federation, 603950
| | - Svetlana A Rodimova
- Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Sq., Nizhny Novgorod, Russian Federation, 603950.,Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Avenue, Novgorod, Nizhny Novgorod, Russian Federation, 603950
| | - Hayk G Torgomyan
- Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Sq., Nizhny Novgorod, Russian Federation, 603950
| | - Elena V Zagaynova
- Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Sq., Nizhny Novgorod, Russian Federation, 603950.,Lobachevsky State University of Nizhny Novgorod, 23 Gagarin Avenue, Novgorod, Nizhny Novgorod, Russian Federation, 603950
| | - Aleksandra V Meleshina
- Privolzhsky Research Medical University, 10/1 Minin and Pozharsky Sq., Nizhny Novgorod, Russian Federation, 603950.
| | - Marina K Kuimova
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, London, W12 0BZ, UK.
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32
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Davidson NM, Gallimore PJ, Bateman B, Ward AD, Botchway SW, Kalberer M, Kuimova MK, Pope FD. Measurement of the fluorescence lifetime of GFP in high refractive index levitated droplets using FLIM. Phys Chem Chem Phys 2020; 22:14704-14711. [PMID: 32573569 DOI: 10.1039/c9cp06395a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Green fluorescent protein (GFP) is a widely used fluorescent probe in the life sciences and biosciences due to its high quantum yield and extinction coefficient, and its ability to bind to biological systems of interest. This study measures the fluorescence lifetime of GFP in sucrose/water solutions of known molarity in order to determine the refractive index dependent lifetime of GFP. A range of refractive indices from 1.43-1.53 were probed by levitating micron sized droplets composed of water/sucrose/GFP in an optical trap under well-constrained conditions of relative humidity. This setup allows for the first reported measurements of the fluorescence lifetime of GFP at refractive indices greater than 1.46. The results obtained at refractive indices less than 1.46 show good agreement with previous studies. Further experiments that trapped droplets of deionised water containing GFP allowed the hygroscopic properties of GFP to be measured. GFP is found to be mildly hygroscopic by mass, but the high ratio of molecular masses of GFP to water (ca. 1500 : 1) signifies that water uptake is large on a per-mole basis. Hygroscopic properties are verified using brightfield microscope imaging, of GFP droplets at low and high relative humidity, by measuring the humidity dependent droplet size. In addition, this experiment allowed the refractive index of pure GFP to be estimated for the first time (1.72 ± 0.07). This work provides reference data for future experiments involving GFP, especially for those conducted in high refractive index media. The work also demonstrates that GFP can be used as a probe for aerosol studies, which require determination of the refractive index of the aerosol of any shape.
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Affiliation(s)
- N M Davidson
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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Clark R, Nawawi MA, Dobre A, Pugh D, Liu Q, Ivanov AP, White AJP, Edel JB, Kuimova MK, McIntosh AJS, Welton T. The effect of structural heterogeneity upon the microviscosity of ionic liquids. Chem Sci 2020; 11:6121-6133. [PMID: 32874514 PMCID: PMC7448533 DOI: 10.1039/d0sc02009e] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 05/26/2020] [Indexed: 01/25/2023] Open
Abstract
The behaviour of two molecular rotors, one charged - 3,3'-diethylthiacarbocyanine iodide (Cy3) and one neutral - 8-[4-decyloxyphenyl]-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY-C10), have been studied in various ionic liquids. The fluorescent decay lifetime has been used to elucidate the structure of the immediate region around the rotor. The neutral BODIPY-C10 was found to prefer the non-polar alkyl chain environment, leading to two trends in the lifetime of the dye: one when it was fully partitioned into the non-polar domain, and one when it also sampled polar moieties. The positively charged Cy3 dye showed a complex relationship between the bulk viscosity of the ionic liquid and lifetime of the molecular rotor. This was attributed to a combination of polarity related spectral changes, changes in anion cages around the dye, and temperature dependent fluorescent lifetimes alongside the dependence of the rotor upon the viscosity.
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Affiliation(s)
- Ryan Clark
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Mohd A Nawawi
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Ana Dobre
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - David Pugh
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK . .,Department of Chemistry , Kings College London , Britannia House, 7 Trinity Street , London , SE1 1DB , UK
| | - Qingshan Liu
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK . .,School of Science , Shenyang Agricultural University , Shenyang 110866 , P. R. China
| | - Aleksandar P Ivanov
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Andrew J P White
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Joshua B Edel
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Marina K Kuimova
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Alastair J S McIntosh
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
| | - Tom Welton
- Department of Chemistry , Molecular Science Research Hub , Imperial College London , 80 Wood Lane , London , W12 0BZ , UK .
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Kubánková M, Chambers JE, Huber RG, Bond PJ, Marciniak SJ, Kuimova MK. Linker length affects photostability of protein-targeted sensor of cellular microviscosity. Methods Appl Fluoresc 2019; 7:044004. [DOI: 10.1088/2050-6120/ab481f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Kubánková M, Summers PA, López-Duarte I, Kiryushko D, Kuimova MK. Microscopic Viscosity of Neuronal Plasma Membranes Measured Using Fluorescent Molecular Rotors: Effects of Oxidative Stress and Neuroprotection. ACS Appl Mater Interfaces 2019; 11:36307-36315. [PMID: 31513373 DOI: 10.1021/acsami.9b10426] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Molecular mobility in neuronal plasma membranes is a crucial factor in brain function. Microscopic viscosity is an important parameter that determines molecular mobility. This study presents the first direct measurement of the microviscosity of plasma membranes of live neurons. Microviscosity maps were obtained using fluorescence lifetime imaging of environment-sensing dyes termed "molecular rotors". Neurons were investigated both in the basal state and following common neurodegenerative stimuli, excitotoxicity, or oxidative stress. Both types of neurotoxic challenges induced microviscosity decrease in cultured neurons, and oxidant-induced membrane fluidification was counteracted by the wide-spectrum neuroprotectant, the H3 peptide. These results provide new insights into molecular mobility in neuronal membranes, paramount for basic brain function, and suggest that preservation of membrane stability may be an important aspect of neuroprotection in brain insults and neurodegenerative disorders.
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Affiliation(s)
| | | | | | - Darya Kiryushko
- Centre for Neuroinflammation and Neurodegeneration , Imperial College London , Hammersmith Hospital Campus, Burlington Danes Building, 160 Du Cane Road , London W12 0NN , U.K
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36
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Kubánková M, Lin X, Albrecht T, Edel JB, Kuimova MK. Rapid Fragmentation during Seeded Lysozyme Aggregation Revealed at the Single Molecule Level. Anal Chem 2019; 91:6880-6886. [PMID: 30999745 DOI: 10.1021/acs.analchem.9b01221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Protein aggregation is associated with neurodegenerative disorders such as Alzheimer's and Parkinson's diseases. The poorly understood pathogenic mechanism of amyloid diseases makes early stage diagnostics or therapeutic intervention a challenge. Seeded polymerization that reduces the duration of the lag phase and accelerates fibril growth is a widespread model to study amyloid formation. Seeding effects are hypothesized to be important in the "infectivity" of amyloids and are linked to the development of systemic amyloidosis in vivo. The exact mechanism of seeding is unclear yet critical to illuminating the propagation of amyloids. Here we report on the lateral and axial fragmentation of seed fibrils in the presence of lysozyme monomers at short time scales, followed by the generation of oligomers and growth of fibrils.
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Affiliation(s)
- Markéta Kubánková
- Department of Chemistry , Imperial College London , Exhibition Road , London SW7 2AZ , U.K
| | - Xiaoyan Lin
- Department of Chemistry , Imperial College London , Exhibition Road , London SW7 2AZ , U.K
| | - Tim Albrecht
- Department of Chemistry , Imperial College London , Exhibition Road , London SW7 2AZ , U.K.,School of Chemistry, Edgbaston Campus , University of Birmingham , Birmingham B15 2TT , U.K
| | - Joshua B Edel
- Department of Chemistry , Imperial College London , Exhibition Road , London SW7 2AZ , U.K
| | - Marina K Kuimova
- Department of Chemistry , Imperial College London , Exhibition Road , London SW7 2AZ , U.K
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37
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Woodcock EM, Girvan P, Eckert J, Lopez-Duarte I, Kubánková M, van Loon JJWA, Brooks NJ, Kuimova MK. Measuring Intracellular Viscosity in Conditions of Hypergravity. Biophys J 2019; 116:1984-1993. [PMID: 31053255 DOI: 10.1016/j.bpj.2019.03.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 02/28/2019] [Accepted: 03/19/2019] [Indexed: 12/12/2022] Open
Abstract
Gravity-sensitive cellular responses are regularly observed in both specialized and nonspecialized cells. One potential mechanism for this sensitivity is a changing viscosity of the intracellular organelles. Here, we report a novel, to our knowledge, viscosity-sensitive molecular rotor based on mesosubstituted boron-dipyrrin used to investigate the response of viscosity of cellular membranes to hypergravity conditions created at the large diameter centrifuge at the European Space Agency Technology Centre. Mouse osteoblastic (MC3T3-E1) and endothelial (human umbilical vein endothelial cell) cell lines were tested, and an increase in viscosity was found with increasing hypergravity loading. This response is thought to be primarily biologically driven, with the potential for a small, instantaneous physical mechanism also contributing to the observed effect. This work provides the first, to our knowledge, quantitative data for cellular viscosity changes under hypergravity, up to 15 × g.
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Affiliation(s)
- Emma M Woodcock
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, United Kingdom; Institute of Chemical Biology, Imperial College London, South Kensington, London, United Kingdom
| | - Paul Girvan
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, United Kingdom; Institute of Chemical Biology, Imperial College London, South Kensington, London, United Kingdom
| | - Julia Eckert
- Department of Physics, School of Science, Technische Universität Dresden, Dresden, Germany; European Space Agency Technology Centre, TEC-MMG LIS Lab, Noordwijk, the Netherlands
| | - Ismael Lopez-Duarte
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, United Kingdom
| | - Markéta Kubánková
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, United Kingdom
| | - Jack J W A van Loon
- European Space Agency Technology Centre, TEC-MMG LIS Lab, Noordwijk, the Netherlands; Department of Oral and Maxillofacial Surgery/Oral Pathology, Dutch Experiment Support Centre, Academic Centre for Dentistry Amsterdam, VU University Medical Centre, Amsterdam, the Netherlands
| | - Nicholas J Brooks
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, United Kingdom; Institute of Chemical Biology, Imperial College London, South Kensington, London, United Kingdom.
| | - Marina K Kuimova
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, United Kingdom; Institute of Chemical Biology, Imperial College London, South Kensington, London, United Kingdom.
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38
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Kubánková M, López-Duarte I, Kiryushko D, Kuimova MK. Molecular rotors report on changes in live cell plasma membrane microviscosity upon interaction with beta-amyloid aggregates. Soft Matter 2018; 14:9466-9474. [PMID: 30427370 DOI: 10.1039/c8sm01633j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Amyloid deposits of aggregated beta-amyloid Aβ(1-42) peptides are a pathological hallmark of Alzheimer's disease. Aβ(1-42) aggregates are known to induce biophysical alterations in cells, including disruption of plasma membranes. We investigated the microviscosity of plasma membranes upon interaction with oligomeric and fibrillar forms of Aβ(1-42). Viscosity-sensing fluorophores termed molecular rotors were utilised to directly measure the microviscosities of giant plasma membrane vesicles (GPMVs) and plasma membranes of live SH-SY5Y and HeLa cells. The fluorescence lifetimes of membrane-inserting BODIPY-based molecular rotors revealed a decrease in bilayer microviscosity upon incubation with Aβ(1-42) oligomers, while fibrillar Aβ(1-42) did not significantly affect the microviscosity of the bilayer. In addition, we demonstrate that the neuroprotective peptide H3 counteracts the microviscosity change induced by Aβ(1-42) oligomers, suggesting the utility of H3 as a neuroprotective therapeutic agent in neurodegenerative disorders and indicating that ligand-induced membrane stabilisation may be a possible mechanism of neuroprotection during neurodegenerative disorders such as Alzheimer's disease.
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Affiliation(s)
- Markéta Kubánková
- Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AZ, UK.
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Affiliation(s)
- Aurimas Vyšniauskas
- Center of Physical Sciences and Technology, Vilnius, Lithuania
- Chemistry Department, Vilnius University, Vilnius, Lithuania
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40
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Chambers JE, Kubánková M, Huber RG, López-Duarte I, Avezov E, Bond PJ, Marciniak SJ, Kuimova MK. An Optical Technique for Mapping Microviscosity Dynamics in Cellular Organelles. ACS Nano 2018; 12:4398-4407. [PMID: 29648785 DOI: 10.1021/acsnano.8b00177] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Microscopic viscosity (microviscosity) is a key determinant of diffusion in the cell and defines the rate of biological processes occurring at the nanoscale, including enzyme-driven metabolism and protein folding. Here we establish a rotor-based organelle viscosity imaging (ROVI) methodology that enables real-time quantitative mapping of cell microviscosity. This approach uses environment-sensitive dyes termed molecular rotors, covalently linked to genetically encoded probes to provide compartment-specific microviscosity measurements via fluorescence lifetime imaging. ROVI visualized spatial and temporal dynamics of microviscosity with suborganellar resolution, reporting on a microviscosity difference of nearly an order of magnitude between subcellular compartments. In the mitochondrial matrix, ROVI revealed several striking findings: a broad heterogeneity of microviscosity among individual mitochondria, unparalleled resilience to osmotic stress, and real-time changes in microviscosity during mitochondrial depolarization. These findings demonstrate the use of ROVI to explore the biophysical mechanisms underlying cell biological processes.
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Affiliation(s)
- Joseph E Chambers
- Cambridge Institute for Medical Research (CIMR), Department of Medicine , University of Cambridge , Wellcome Trust/MRC Building, Hills Road , Cambridge , CB2 0XY , United Kingdom
| | - Markéta Kubánková
- Department of Chemistry , Imperial College London , South Kensington , London , SW7 2AZ , United Kingdom
| | - Roland G Huber
- Bioinformatics Institute (BII) , Agency for Science, Technology, and Research (A*STAR) , Matrix 07-01, 30 Biopolis Street , 138671 Singapore
| | - Ismael López-Duarte
- Department of Chemistry , Imperial College London , South Kensington , London , SW7 2AZ , United Kingdom
| | - Edward Avezov
- UK Dementia Research Institute at the University of Cambridge , Cambridge Biomedical Campus, Cambridge CB2 0AH , United Kingdom
| | - Peter J Bond
- Bioinformatics Institute (BII) , Agency for Science, Technology, and Research (A*STAR) , Matrix 07-01, 30 Biopolis Street , 138671 Singapore
- Department of Biological Sciences , National University of Singapore , 14 Science Drive 4 , 117543 Singapore
| | - Stefan J Marciniak
- Cambridge Institute for Medical Research (CIMR), Department of Medicine , University of Cambridge , Wellcome Trust/MRC Building, Hills Road , Cambridge , CB2 0XY , United Kingdom
| | - Marina K Kuimova
- Department of Chemistry , Imperial College London , South Kensington , London , SW7 2AZ , United Kingdom
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41
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Vyšniauskas A, Lopez-Duarte I, Thompson AJ, Bull JA, Kuimova MK. Surface functionalisation with viscosity-sensitive BODIPY molecular rotor. Methods Appl Fluoresc 2018; 6:034001. [PMID: 29611817 DOI: 10.1088/2050-6120/aabb2c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Surface functionalisation with viscosity sensitive dyes termed 'molecular rotors' can potentially open up new opportunities in sensing, for example for non-invasive biological viscosity imaging, in studying the effect of shear stress on lipid membranes and in cells, and in imaging contacts between surfaces upon applied pressure. We have functionalised microscope slides with BODIPY-based molecular rotor capable of viscosity sensing via its fluorescence lifetime. We have optimised functionalisation conditions and prepared the slides with the BODIPY rotor attached directly to the surface of glass slides and through polymer linkers of 5 kDa and 40 kDa in mass. The slides were characterised for their sensitivity to viscosity, and used to measure viscosity of supported lipid bilayers during photooxidation, and of giant unilamellar vesicles lying on the surface of the slide. We conclude that our functionalised slides show promise for a variety of viscosity sensing applications.
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Vyšniauskas A, López-Duarte I, Duchemin N, Vu TT, Wu Y, Budynina EM, Volkova YA, Peña Cabrera E, Ramírez-Ornelas DE, Kuimova MK. Exploring viscosity, polarity and temperature sensitivity of BODIPY-based molecular rotors. Phys Chem Chem Phys 2018; 19:25252-25259. [PMID: 28718466 DOI: 10.1039/c7cp03571c] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Microviscosity is a key parameter controlling the rate of diffusion and reactions on the microscale. One of the most convenient tools for measuring microviscosity is by fluorescent viscosity sensors termed 'molecular rotors'. BODIPY-based molecular rotors in particular proved extremely useful in combination with fluorescence lifetime imaging microscopy, for providing quantitative viscosity maps of living cells as well as measuring dynamic changes in viscosity over time. In this work, we investigate several new BODIPY-based molecular rotors with the aim of improving on the current viscosity sensing capabilities and understanding how the structure of the fluorophore is related to its function. We demonstrate that due to subtle structural changes, BODIPY-based molecular rotors may become sensitive to temperature and polarity of their environment, as well as to viscosity, and provide a photophysical model explaining the nature of this sensitivity. Our data suggests that a thorough understanding of the photophysics of any new molecular rotor, in environments of different viscosity, temperature and polarity, is a must before moving on to applications in viscosity sensing.
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Affiliation(s)
- Aurimas Vyšniauskas
- Chemistry Department, Imperial College London, Exhibition Road, SW7 2AZ, UK.
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Vyšniauskas A, Ding D, Qurashi M, Boczarow I, Balaz M, Anderson HL, Kuimova MK. Frontispiece: Tuning the Sensitivity of Fluorescent Porphyrin Dimers to Viscosity and Temperature. Chemistry 2017. [DOI: 10.1002/chem.201784664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Aurimas Vyšniauskas
- Chemistry Department; Imperial College London; Exhibition Road London SW7 2AZ UK
| | - Dong Ding
- Chemistry Department; Imperial College London; Exhibition Road London SW7 2AZ UK
| | - Maryam Qurashi
- Chemistry Department; Imperial College London; Exhibition Road London SW7 2AZ UK
| | - Igor Boczarow
- Chemistry Research Laboratory; Department of Chemistry; University of Oxford; Oxford OX1 3TA UK
| | - Milan Balaz
- Chemistry Research Laboratory; Department of Chemistry; University of Oxford; Oxford OX1 3TA UK
- Present address: Underwood International College, Integrated Science and Engineering Division; Yonsei University; Seoul 03722 Republic of Korea
| | - Harry L. Anderson
- Chemistry Research Laboratory; Department of Chemistry; University of Oxford; Oxford OX1 3TA UK
| | - Marina K. Kuimova
- Chemistry Department; Imperial College London; Exhibition Road London SW7 2AZ UK
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Vyšniauskas A, Ding D, Qurashi M, Boczarow I, Balaz M, Anderson HL, Kuimova MK. Tuning the Sensitivity of Fluorescent Porphyrin Dimers to Viscosity and Temperature. Chemistry 2017; 23:11001-11010. [PMID: 28480989 PMCID: PMC5575558 DOI: 10.1002/chem.201700740] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 01/04/2023]
Abstract
Conjugated porphyrin dimers have emerged as versatile viscosity-sensitive fluorophores that are suitable for quantitative measurements of microscopic viscosity by ratiometric and fluorescence lifetime-based methods, in a concentration-independent manner. Here, we investigate the effect of extended conjugation in a porphyrin-dimer structure on their ability to sense viscosity and temperature. We show that the sensitivity of the fluorescence lifetime to temperature is a unique property of only a few porphyrin dimers.
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Affiliation(s)
| | - Dong Ding
- Chemistry DepartmentImperial College LondonExhibition RoadLondonSW7 2AZUK
| | - Maryam Qurashi
- Chemistry DepartmentImperial College LondonExhibition RoadLondonSW7 2AZUK
| | - Igor Boczarow
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of OxfordOxfordOX1 3TAUK
| | - Milan Balaz
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of OxfordOxfordOX1 3TAUK
- Present address: Underwood International College, Integrated Science and Engineering DivisionYonsei UniversitySeoul03722Republic of Korea
| | - Harry L. Anderson
- Chemistry Research LaboratoryDepartment of ChemistryUniversity of OxfordOxfordOX1 3TAUK
| | - Marina K. Kuimova
- Chemistry DepartmentImperial College LondonExhibition RoadLondonSW7 2AZUK
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Kubánková M, López-Duarte I, Bull JA, Vadukul DM, Serpell LC, de Saint Victor M, Stride E, Kuimova MK. Probing supramolecular protein assembly using covalently attached fluorescent molecular rotors. Biomaterials 2017. [PMID: 28622603 DOI: 10.1016/j.biomaterials.2017.06.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Changes in microscopic viscosity and macromolecular crowding accompany the transition of proteins from their monomeric forms into highly organised fibrillar states. Previously, we have demonstrated that viscosity sensitive fluorophores termed 'molecular rotors', when freely mixed with monomers of interest, are able to report on changes in microrheology accompanying amyloid formation, and measured an increase in rigidity of approximately three orders of magnitude during aggregation of lysozyme and insulin. Here we extend this strategy by covalently attaching molecular rotors to several proteins capable of assembly into fibrils, namely lysozyme, fibrinogen and amyloid-β peptide (Aβ(1-42)). We demonstrate that upon covalent attachment the molecular rotors can successfully probe supramolecular assembly in vitro. Importantly, our new strategy has wider applications in cellulo and in vivo, since covalently attached molecular rotors can be successfully delivered in situ and will colocalise with the aggregating protein, for example inside live cells. This important advantage allowed us to follow the microscopic viscosity changes accompanying blood clotting and during Aβ(1-42) aggregation in live SH-SY5Y cells. Our results demonstrate that covalently attached molecular rotors are a widely applicable tool to study supramolecular protein assembly and can reveal microrheological features of aggregating protein systems both in vitro and in cellulo not observable through classical fluorescent probes operating in light switch mode.
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Affiliation(s)
- Markéta Kubánková
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Ismael López-Duarte
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - James A Bull
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Devkee M Vadukul
- School of Life Sciences, University of Sussex, Brighton, BN1 9QG, UK
| | - Louise C Serpell
- School of Life Sciences, University of Sussex, Brighton, BN1 9QG, UK
| | | | - Eleanor Stride
- Institute of Biomedical Engineering, University of Oxford, Oxford, OX3 7DQ, UK
| | - Marina K Kuimova
- Chemistry Department, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Davidson N, Tong HJ, Kalberer M, Seville PC, Ward AD, Kuimova MK, Pope FD. Measurement of the Raman spectra and hygroscopicity of four pharmaceutical aerosols as they travel from pressurised metered dose inhalers (pMDI) to a model lung. Int J Pharm 2017; 520:59-69. [PMID: 28159683 DOI: 10.1016/j.ijpharm.2017.01.051] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 01/12/2017] [Accepted: 01/25/2017] [Indexed: 10/20/2022]
Abstract
Particle inhalation is an effective and rapid delivery method for a variety of pharmaceuticals, particularly bronchodilation drugs used for treating asthma and COPD. Conditions of relative humidity and temperature inside the lungs are generally very different from the outside ambient air, with the lung typically being warmer and more humid. Changes in humidity, from inhaler to lung, can cause hygroscopic phase transitions and particle growth. Increasing particle size and mass can negatively affect particle deposition within the lung leading to inefficient treatment, while deliquescence prior to impaction is liable to accelerate drug uptake. To better understand the hygroscopic properties of four pharmaceutical aerosol particles; pharmaceutical particles from four commercially available pressurised metered dose inhalers (pMDIs) were stably captured in an optical trap, and their composition was examined online via Raman spectroscopy. Micron-sized particles of salbutamol sulfate, salmeterol xinafoate, fluticasone propionate and ciclesonide were levitated and examined over a range of relative humidity values inside a chamber designed to mimic conditions within the respiratory tract. The effect of temperature upon hygroscopicity was also investigated for salbutamol sulfate particles. Salbutamol sulfate was found to have significant hygroscopicity, salmeterol xinafoate showed some hygroscopic interactions, whilst fluticasone propionate and ciclesonide revealed no observable hygroscopicity. Thermodynamic and structural modelling is used to explain the observed experimental results.
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Affiliation(s)
- N Davidson
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - H-J Tong
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - M Kalberer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - P C Seville
- School of Pharmacy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK; School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, Lancs, PR1 2HE, UK
| | - A D Ward
- Central Laser Facility, Rutherford Appleton Laboratory, Harwell, Oxford, OX11 0QX, UK
| | - M K Kuimova
- Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - F D Pope
- School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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Shimolina LE, Izquierdo MA, López-Duarte I, Bull JA, Shirmanova MV, Klapshina LG, Zagaynova EV, Kuimova MK. Imaging tumor microscopic viscosity in vivo using molecular rotors. Sci Rep 2017; 7:41097. [PMID: 28134273 PMCID: PMC5278387 DOI: 10.1038/srep41097] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 12/12/2016] [Indexed: 01/02/2023] Open
Abstract
The microscopic viscosity plays an essential role in cellular biophysics by controlling the rates of diffusion and bimolecular reactions within the cell interior. While several approaches have emerged that have allowed the measurement of viscosity and diffusion on a single cell level in vitro, the in vivo viscosity monitoring has not yet been realized. Here we report the use of fluorescent molecular rotors in combination with Fluorescence Lifetime Imaging Microscopy (FLIM) to image microscopic viscosity in vivo, both on a single cell level and in connecting tissues of subcutaneous tumors in mice. We find that viscosities recorded from single tumor cells in vivo correlate well with the in vitro values from the same cancer cell line. Importantly, our new method allows both imaging and dynamic monitoring of viscosity changes in real time in live animals and thus it is particularly suitable for diagnostics and monitoring of the progress of treatments that might be accompanied by changes in microscopic viscosity.
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Affiliation(s)
- Lyubov’ E. Shimolina
- Institute of Biomedical Technologies, Nizhny Novgorod State Medical Academy, Minin and Pozharsky Square, 10/1, Nizhny Novgorod, 603005, Russia
- Institute of Biology and Biomedicine, Nizhny Novgorod State University, Gagarin Avenue, 23, Nizhny Novgorod, 603950, Russia
| | | | - Ismael López-Duarte
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - James A. Bull
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
| | - Marina V. Shirmanova
- Institute of Biomedical Technologies, Nizhny Novgorod State Medical Academy, Minin and Pozharsky Square, 10/1, Nizhny Novgorod, 603005, Russia
| | - Larisa G. Klapshina
- Razuvaev Institute of Organometallic Chemistry RAS, Tropinina Street, 49, Nizhny Novgorod, 603950, Russia
| | - Elena V. Zagaynova
- Institute of Biomedical Technologies, Nizhny Novgorod State Medical Academy, Minin and Pozharsky Square, 10/1, Nizhny Novgorod, 603005, Russia
| | - Marina K. Kuimova
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
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Carugo D, Aron M, Sezgin E, Bernardino de la Serna J, Kuimova MK, Eggeling C, Stride E. Modulation of the molecular arrangement in artificial and biological membranes by phospholipid-shelled microbubbles. Biomaterials 2017; 113:105-117. [DOI: 10.1016/j.biomaterials.2016.10.034] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 10/22/2016] [Accepted: 10/23/2016] [Indexed: 12/17/2022]
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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