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] [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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Dos Santos DNS, Naskar N, Delgado-Pinar E, Reess K, Seixas de Melo JS, Rueck A. Bromine indirubin FLIM/PLIM sensors to measure oxygen in normoxic and hypoxic PDT conditions. Photodiagnosis Photodyn Ther 2024; 45:103964. [PMID: 38218570 DOI: 10.1016/j.pdpdt.2024.103964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/26/2023] [Accepted: 01/04/2024] [Indexed: 01/15/2024]
Abstract
BACKGROUND The induction of phototoxicity during photodynamic therapy (PDT) is dependent on oxygen availability. For this reason, the development of sensors to measure oxygen and oxygen consumption is extremely important. APPROACH In this project we have used Fluorescence Lifetime imaging (FLIM) and Phosphorescence Lifetime Imaging/ delayed Fluorescence Lifetime Imaging (PLIM/dFLIM) to investigate the ability of bromine indirubin derivatives as oxygen sensors. RESULTS The oxygen sensitivity of bromine indirubins was detected through PLIM/dFLIM. Moreover, we have observed, by measuring nicotinamide adenine dinucleotide (NADH) FLIM, that bromine indirubin has a significant impact on cellular metabolism by shifting the SCC-4 Cells metabolism from oxidative phosphorylation (OXPHOS) to glycolysis. CONCLUSIONS In conclusion, this study successfully achieves its goals and provides important insights into the use of indirubin as a potential oxygen consumption sensor with the capability to identify and differentiate between normoxic and hypoxic regions within the cells.
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Affiliation(s)
- D N S Dos Santos
- University Ulm, Core Facility Confocal and Multiphoton Microscopy N24, Albert-Einstein-Allee 11, 89081 Ulm, Germany; University of Coimbra, CQC-ISM, Department of Chemistry, Coimbra, P3004-535, Portugal.
| | - N Naskar
- University Ulm, Core Facility Confocal and Multiphoton Microscopy N24, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - E Delgado-Pinar
- University of Coimbra, CQC-ISM, Department of Chemistry, Coimbra, P3004-535, Portugal; Molecular Science Institute, Inorganic Chemistry Department, University of Valencia, C/Catedrático José Beltrán 2, Paterna 46980, Valencia, Spain
| | - K Reess
- University Ulm, Core Facility Confocal and Multiphoton Microscopy N24, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - J S Seixas de Melo
- University of Coimbra, CQC-ISM, Department of Chemistry, Coimbra, P3004-535, Portugal
| | - A Rueck
- University Ulm, Core Facility Confocal and Multiphoton Microscopy N24, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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3
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Deng J, Wang X, Zhao Y, Zhao X, Yang L, Qi Z. A dual donor-acceptor fluorescent probe with viscosity response and lipid droplets targeting to initiate oxidative stress for tumor elimination. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 305:123503. [PMID: 37857075 DOI: 10.1016/j.saa.2023.123503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/09/2023] [Accepted: 10/07/2023] [Indexed: 10/21/2023]
Abstract
A dual donor-acceptor photosensitizer TCN-2 prepared based on single donor-acceptor could fulfil lipid droplets targeting to trigger apoptosis and tumor growth arrest. Meanwhile, all of experiments both in phosphate buffer solution and intracellular surroundings have demonstrated that TCN-2 catalyzed the production of type I as well as type II reactive oxygen species, forming a hybrid reactive oxygen species pattern, indicating that TCN-2 could be applied to initiate a series of biological responses triggered by oxidative stress within most high-viscosity solid tumors. In addition, TCN-2 also has the capability of fluorescence imaging, which could perfectly combine therapeutic imaging to achieve therapeutic effects while identifying cancerous lesions. Due to the structural design of double electron-absorbing groups, TCN-2 retained excellent lipophilicity while enhancing solubility in the biological environment. Terrific biocompatibility, minimal phototoxic damage to normal cells and tissues, and specific driving to prescriptive organelles to maximize therapeutic effects were used to enhance the therapeutic effect of photodynamic therapy to cease disease progression.
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Affiliation(s)
- Jing Deng
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
| | - Xing Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
| | - Yongfei Zhao
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
| | - Xinxin Zhao
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
| | - Li Yang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China
| | - Zhengjian Qi
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China.
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4
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Baranova AA, Tyurin AP, Korshun VA, Alferova VA. Sensing of Antibiotic-Bacteria Interactions. Antibiotics (Basel) 2023; 12:1340. [PMID: 37627760 PMCID: PMC10451291 DOI: 10.3390/antibiotics12081340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 08/15/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023] Open
Abstract
Sensing of antibiotic-bacteria interactions is an important area of research that has gained significant attention in recent years. Antibiotic resistance is a major public health concern, and it is essential to develop new strategies for detecting and monitoring bacterial responses to antibiotics in order to maintain effective antibiotic development and antibacterial treatment. This review summarizes recent advances in sensing strategies for antibiotic-bacteria interactions, which are divided into two main parts: studies on the mechanism of action for sensitive bacteria and interrogation of the defense mechanisms for resistant ones. In conclusion, this review provides an overview of the present research landscape concerning antibiotic-bacteria interactions, emphasizing the potential for method adaptation and the integration of machine learning techniques in data analysis, which could potentially lead to a transformative impact on mechanistic studies within the field.
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Affiliation(s)
| | | | | | - Vera A. Alferova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia; (A.A.B.); (A.P.T.); (V.A.K.)
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5
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Polita A, Stancikaitė M, Žvirblis R, Maleckaitė K, Dodonova-Vaitkūnienė J, Tumkevičius S, Shivabalan AP, Valinčius G. Designing a green-emitting viscosity-sensitive 4,4-difluoro-4-bora-3a,4a-diaza- s-indacene (BODIPY) probe for plasma membrane viscosity imaging. RSC Adv 2023; 13:19257-19264. [PMID: 37377877 PMCID: PMC10291278 DOI: 10.1039/d3ra04126c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 06/29/2023] Open
Abstract
Viscosity is a key characteristic of lipid membranes - it governs the passive diffusion of solutes and affects the lipid raft formation and membrane fluidity. Precise determination of viscosity values in biological systems is of great interest and viscosity-sensitive fluorescent probes offer a convenient solution for this task. In this work we present a novel membrane-targeting and water-soluble viscosity probe BODIPY-PM, which is based on one of the most frequently used probes BODIPY-C10. Despite its regular use, BODIPY-C10 suffers from poor integration into liquid-ordered lipid phases and lack of water solubility. Here, we investigate the photophysical characteristics of BODIPY-PM and demonstrate that solvent polarity only slightly affects the viscosity-sensing qualities of BODIPY-PM. In addition, with fluorescence lifetime imaging microscopy (FLIM), we imaged microviscosity in complex biological systems - large unilamellar vesicles (LUVs), tethered bilayer membranes (tBLMs) and live lung cancer cells. Our study showcases that BODIPY-PM preferentially stains the plasma membranes of live cells, equally well partitions into both liquid-ordered and liquid-disordered phases and reliably distinguishes lipid phase separation in tBLMs and LUVs.
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Affiliation(s)
- Artūras Polita
- Institute of Biochemistry, Life Sciences Center, Vilnius University Saulėtekio Av. 7 Vilnius LT-10257 Lithuania
| | - Milda Stancikaitė
- Center of Physical Sciences and Technology Saulėtekio Av. 3 Vilnius LT-10257 Lithuania
| | - Rokas Žvirblis
- Life Sciences Center, Institute of Biotechnology, Vilnius University Saulėtekio Av. 7 Vilnius LT-10257 Lithuania
| | - Karolina Maleckaitė
- Center of Physical Sciences and Technology Saulėtekio Av. 3 Vilnius LT-10257 Lithuania
| | - Jelena Dodonova-Vaitkūnienė
- Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University Naugarduko St. 24 Vilnius LT-03225 Lithuania
| | - Sigitas Tumkevičius
- Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University Naugarduko St. 24 Vilnius LT-03225 Lithuania
| | - Arun Prabha Shivabalan
- Institute of Biochemistry, Life Sciences Center, Vilnius University Saulėtekio Av. 7 Vilnius LT-10257 Lithuania
| | - Gintaras Valinčius
- Institute of Biochemistry, Life Sciences Center, Vilnius University Saulėtekio Av. 7 Vilnius LT-10257 Lithuania
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6
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Yang R, Zhu T, Xu J, Zhao Y, Kuang Y, Sun M, Chen Y, He W, Wang Z, Jiang T, Zhang H, Wei M. Organic Fluorescent Probes for Monitoring Micro-Environments in Living Cells and Tissues. Molecules 2023; 28:molecules28083455. [PMID: 37110689 PMCID: PMC10147038 DOI: 10.3390/molecules28083455] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 04/07/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023] Open
Abstract
As a vital parameter in living cells and tissues, the micro-environment is crucial for the living organisms. Significantly, organelles require proper micro-environment to achieve normal physiological processes, and the micro-environment in organelles can reflect the state of organelles in living cells. Moreover, some abnormal micro-environments in organelles are closely related to organelle dysfunction and disease development. So, visualizing and monitoring the variation of micro-environments in organelles is helpful for physiologists and pathologists to study the mechanisms of the relative diseases. Recently, a large variety of fluorescent probes was developed to study the micro-environments in living cells and tissues. However, the systematic and comprehensive reviews on the organelle micro-environment in living cells and tissues have rarely been published, which may hinder the research progress in the field of organic fluorescent probes. In this review, we will summarize the organic fluorescent probes for monitoring the microenvironment, such as viscosity, pH values, polarity, and temperature. Further, diverse organelles (mitochondria, lysosome, endoplasmic reticulum, cell membrane) about microenvironments will be displayed. In this process, the fluorescent probes about the "off-on" and ratiometric category (the diverse fluorescence emission) will be discussed. Moreover, the molecular designing, chemical synthesis, fluorescent mechanism, and the bio-applications of these organic fluorescent probes in cells and tissues will also be discussed. Significantly, the merits and defects of current microenvironment-sensitive probes are outlined and discussed, and the development tendency and challenges for this kind of probe are presented. In brief, this review mainly summarizes some typical examples and highlights the progress of organic fluorescent probes for monitoring micro-environments in living cells and tissues in recent research. We anticipate that this review will deepen the understanding of microenvironment in cells and tissues and facilitate the studies and development of physiology and pathology.
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Affiliation(s)
- Rui Yang
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Tao Zhu
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Jingyang Xu
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Yuang Zhao
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Yawei Kuang
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Mengni Sun
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Yuqi Chen
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Wei He
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Zixing Wang
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Tingwang Jiang
- Department of Key Laboratory, The Second People's Hospital of Changshu, the Affiliated Changshu Hospital of Nantong University, Changshu 215500, China
| | - Huiguo Zhang
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
| | - Mengmeng Wei
- School of Electronics and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
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7
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Directly imaging emergence of phase separation in peroxidized lipid membranes. Commun Chem 2023; 6:15. [PMID: 36697756 PMCID: PMC9845225 DOI: 10.1038/s42004-022-00809-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 12/29/2022] [Indexed: 01/19/2023] Open
Abstract
Lipid peroxidation is a process which is key in cell signaling and disease, it is exploited in cancer therapy in the form of photodynamic therapy. The appearance of hydrophilic moieties within the bilayer's hydrocarbon core will dramatically alter the structure and mechanical behavior of membranes. Here, we combine viscosity sensitive fluorophores, advanced microscopy, and X-ray diffraction and molecular simulations to directly and quantitatively measure the bilayer's structural and viscoelastic properties, and correlate these with atomistic molecular modelling. Our results indicate an increase in microviscosity and a decrease in the bending rigidity upon peroxidation of the membranes, contrary to the trend observed with non-oxidized lipids. Fluorescence lifetime imaging microscopy and MD simulations give evidence for the presence of membrane regions of different local order in the oxidized membranes. We hypothesize that oxidation promotes stronger lipid-lipid interactions, which lead to an increase in the lateral heterogeneity within the bilayer and the creation of lipid clusters of higher order.
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8
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Sharma S, Srinivas S, Rakshit S, Sengupta S. Aminoindole and naphthalimide based charge transfer fluorescent probes for pH sensing and live cell imaging. Org Biomol Chem 2022; 20:9422-9430. [PMID: 36408696 DOI: 10.1039/d2ob01614a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Fluorescent probes are essential for imaging of cancer cells and for tracking organelles inside cells. We have synthesized three molecular rotors AIN, AINP and F-AINP based on 1-aminoindole (AI) as an electron donor and naphthalimide as an electron acceptor. All compounds showed charge transfer (CT) character, aggregation induced emission (AIE) and emission responsiveness towards temperature variation and solvent viscosity. AINP was most sensitive towards viscosity among all molecules with a viscosity sensitivity of ∼0.37. AIN, AINP and F-AINP showed negative temperature coefficients in chloroform with internal sensitivities of -0.04% °C-1, -0.08% °C-1 and -0.1% °C-1, respectively. Furthermore, all the rotors were sensitive towards the pH of the solvent environment as revealed by acid titration and base back-titration and served as colorimetric pH sensors with intriguing photophysical characteristics. Additionally, AINP and F-AINP were used to image the live cancer cell line A549 and the fibroblast cell line L929, and the imaging studies revealed the incorporation of dyes in the cytoplasmic space of the cells except for the nuclei.
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Affiliation(s)
- Sushil Sharma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, P.O. Manauli, Mohali, Punjab 140306, India.
| | - Sai Srinivas
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, P.O. Manauli, Mohali, Punjab 140306, India.
| | - Sabyasachi Rakshit
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, P.O. Manauli, Mohali, Punjab 140306, India.
| | - Sanchita Sengupta
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, P.O. Manauli, Mohali, Punjab 140306, India.
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9
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Ultrafast Isomerization vs. Bond Twisting Process - Role of a Proton. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Hanaoka K, Iwaki S, Yagi K, Myochin T, Ikeno T, Ohno H, Sasaki E, Komatsu T, Ueno T, Uchigashima M, Mikuni T, Tainaka K, Tahara S, Takeuchi S, Tahara T, Uchiyama M, Nagano T, Urano Y. General Design Strategy to Precisely Control the Emission of Fluorophores via a Twisted Intramolecular Charge Transfer (TICT) Process. J Am Chem Soc 2022; 144:19778-19790. [PMID: 36191139 DOI: 10.1021/jacs.2c06397] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fluorogenic probes for bioimaging have become essential tools for life science and medicine, and the key to their development is a precise understanding of the mechanisms available for fluorescence off/on control, such as photoinduced electron transfer (PeT) and Förster resonance energy transfer (FRET). Here we establish a new molecular design strategy to rationally develop activatable fluorescent probes, which exhibit a fluorescence off/on change in response to target biomolecules, by controlling the twisted intramolecular charge transfer (TICT) process. This approach was developed on the basis of a thorough investigation of the fluorescence quenching mechanism of N-phenyl rhodamine dyes (commercially available as the QSY series) by means of time-dependent density functional theory (TD-DFT) calculations and photophysical evaluation of their derivatives. To illustrate and validate this TICT-based design strategy, we employed it to develop practical fluorogenic probes for HaloTag and SNAP-tag. We further show that the TICT-controlled fluorescence off/on mechanism is generalizable by synthesizing a Si-rhodamine-based fluorogenic probe for HaloTag, thus providing a palette of chemical dyes that spans the visible and near-infrared range.
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Affiliation(s)
- Kenjiro Hanaoka
- Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30 Shibakoen, Minoto-ku, Tokyo105-8512, Japan
| | | | - Kiyoshi Yagi
- Theoretical Molecular Science Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama351-0198, Japan
| | | | | | - Hisashi Ohno
- Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30 Shibakoen, Minoto-ku, Tokyo105-8512, Japan
| | - Eita Sasaki
- Graduate School of Pharmaceutical Sciences, Keio University, 1-5-30 Shibakoen, Minoto-ku, Tokyo105-8512, Japan
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11
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Schmitt S, Renzer G, Benrath J, Best A, Jiang S, Landfester K, Butt HJ, Simonutti R, Crespy D, Koynov K. Monitoring the Formation of Polymer Nanoparticles with Fluorescent Molecular Rotors. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sascha Schmitt
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Galit Renzer
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Jennifer Benrath
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Andreas Best
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Shuai Jiang
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Hans-Jürgen Butt
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Roberto Simonutti
- Department of Material Science, University Milano Bicocca, Via R Cozzi 55, I-20125 Milan, Italy
| | | | - Kaloian Koynov
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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12
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Eivgi O, Blum SA. Real-Time Polymer Viscosity-Catalytic Activity Relationships on the Microscale. J Am Chem Soc 2022; 144:13574-13585. [PMID: 35866383 DOI: 10.1021/jacs.2c03711] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Polymer growth induces physical changes to catalyst microenvironments. Here, these physical changes are quantified in real time and are found to influence microscale chemical catalysis and the polymerization rate. By developing a method to "peer into" optically transparent living-polymer particles, simultaneous imaging of both viscosity changes and chemical activity was achieved for the first time with high spatiotemporal resolution through a combination of fluorescence intensity microscopy and fluorescence lifetime imaging microscopy techniques. Specifically, an increase in microenvironment viscosity led to a corresponding local decrease in the catalytic molecular ruthenium ring-opening metathesis polymerization rate, plausibly by restricting diffusional access to active catalytic centers. Consistent with this diffusional-access model, these viscosity changes were found to be monomer-dependent, showing larger changes in microenvironment viscosity in cross-linked polydicyclopentadiene compared to non-crosslinked polynorbornene. The sensitivity and high spatial resolution of the imaging technique revealed significant variations in microviscosities between different particles and subparticle regions. These revealed spatial heterogeneities would not be observable through alternative ensemble analytical techniques that provide sample-averaged measurements. The observed spatial heterogeneities provide a physical mechanism for variation in catalytic chemical activity on the microscale that may accumulate and lead to nonhomogeneous polymer properties on the bulk scale.
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Affiliation(s)
- Or Eivgi
- Department of Chemistry, University of California, Irvine, Irvine California 92697-2025, United States
| | - Suzanne A Blum
- Department of Chemistry, University of California, Irvine, Irvine California 92697-2025, United States
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13
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Maleckaitė K, Dodonova-Vaitkūnienė J, Žilėnaitė R, Tumkevičius S, Vyšniauskas A. Red fluorescent BODIPY molecular rotor for high microviscosity environments. Methods Appl Fluoresc 2022; 10. [PMID: 35705104 DOI: 10.1088/2050-6120/ac7943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/15/2022] [Indexed: 11/11/2022]
Abstract
Microviscosity has a strong impact for diffusion-controlled processes in biological environments. BODIPY molecular rotors are viscosity-sensitive fluorophores that provide a simple and non-invasive way to visualise microviscosity. Although green fluorescent probes are already well developed for imaging, thick biological samples require longer wavelengths for investigation. This work focuses on the examination of novelβ-substitutedmeso-phenyl-BODIPYs possessing a red emission. We report a new red fluorescent BODIPY-based probe BP-Vinyl-NO2suitable for sensing microviscosity in rigid environments of over 100 000 cP viscosities. Furthermore, we demonstrate that changing the methyl position fromorthotometaon theβ-phenyl-substituted conjugate BP-PH-m2M-NO2redshifts absorbance and fluorescence spectra while maintaining viscosity sensitivity. Finally, we show that nitro-substitution ofmeso-phenyl is a versatile approach to improve the sensitivity to viscosity while suppressing sensitivity to polarity and temperature of such derivatives. In summary, we present two nitro-substituted red fluorescent probes that could be used as lifetime-based microviscosity sensors.
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Affiliation(s)
- Karolina Maleckaitė
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, LT-10257, Lithuania
| | - Jelena Dodonova-Vaitkūnienė
- Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko str. 24, Vilnius, LT-03225, Lithuania
| | - Rugilė Žilėnaitė
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, LT-10257, Lithuania.,Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko str. 24, Vilnius, LT-03225, Lithuania
| | - Sigitas Tumkevičius
- Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko str. 24, Vilnius, LT-03225, Lithuania
| | - Aurimas Vyšniauskas
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, LT-10257, Lithuania.,Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko str. 24, Vilnius, LT-03225, Lithuania
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14
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Dziuba D. Environmentally sensitive fluorescent nucleoside analogues as probes for nucleic acid - protein interactions: molecular design and biosensing applications. Methods Appl Fluoresc 2022; 10. [PMID: 35738250 DOI: 10.1088/2050-6120/ac7bd8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 06/23/2022] [Indexed: 11/12/2022]
Abstract
Fluorescent nucleoside analogues (FNAs) are indispensable in studying the interactions of nucleic acids with nucleic acid-binding proteins. By replacing one of the poorly emissive natural nucleosides, FNAs enable real-time optical monitoring of the binding interactions in solutions, under physiologically relevant conditions, with high sensitivity. Besides that, FNAs are widely used to probe conformational dynamics of biomolecular complexes using time-resolved fluorescence methods. Because of that, FNAs are tools of high utility for fundamental biological research, with potential applications in molecular diagnostics and drug discovery. Here I review the structural and physical factors that can be used for the conversion of the molecular binding events into a detectable fluorescence output. Typical environmentally sensitive FNAs, their properties and applications, and future challenges in the field are discussed.
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Affiliation(s)
- Dmytro Dziuba
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, Illkirch-Graffenstaden, Grand Est, 67401, FRANCE
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15
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Ruan N, Yu X, Li H, Wang Y, Huang C. A HBDI-Based Fluorescent Probe for Labeling Endoplasmic Reticulum in Living Cells. Chem Asian J 2022; 17:e202200383. [PMID: 35674678 DOI: 10.1002/asia.202200383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/27/2022] [Indexed: 11/10/2022]
Abstract
The endoplasmic reticulum (ER) is an important organelle in eukaryotic cells and is closely involved in the synthesis and processing of proteins, as well as the storage, regulation, and release of calcium. A series of signaling pathways within the ER play a crucial part in the pathogenesis of various diseases, including cancer. Thus, it is necessary to design ER-targeting probes to monitor these signaling pathways. Additionally, precision medicine also requires new ER-targeting group to facilitate the delivery of drug cargoes to the ER. However, only a limited number of ER-targeting groups have been used for the design of fluorescent probes for ER imaging in living cells, as well as the development of ER-targeted drug delivery systems. Herein, a new ER-targeting fluorescent probe (BDI-ER) was designed and prepared. BDI-ER contains the hydrophilic fluorophore, derived from the core structure of GFP, and two hydrophobic octadecane chains. The amphipathic nature of BDI-ER facilitates localization in the ER. Live cell imaging demonstrated selective localization of BDI-ER towards ER compared to other organelles. Additionally, co-localization imaging in various cell lines indicate that BDI-ER is effective at targeting the ER.
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Affiliation(s)
- Nanan Ruan
- The Education Ministry Key Laboratory of Resource Chemistry, Shanghai, Frontiers Science Research Base of Biomimetic Catalysis, Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, China
| | - Xiang Yu
- The Education Ministry Key Laboratory of Resource Chemistry, Shanghai, Frontiers Science Research Base of Biomimetic Catalysis, Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, China
| | - Huan Li
- The Education Ministry Key Laboratory of Resource Chemistry, Shanghai, Frontiers Science Research Base of Biomimetic Catalysis, Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, China
| | - Yang Wang
- The Education Ministry Key Laboratory of Resource Chemistry, Shanghai, Frontiers Science Research Base of Biomimetic Catalysis, Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, China
| | - Chusen Huang
- The Education Ministry Key Laboratory of Resource Chemistry, Shanghai, Frontiers Science Research Base of Biomimetic Catalysis, Shanghai Key Laboratory of Rare Earth Functional Materials, Department of Chemistry, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, China
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16
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Bochenkov VE, Sopova NS, Shakhov AM, Astafiev AA, Bochenkova AV. Protein Mobility Measurements through Oxidative Green-to-Red Photoconversion of EGFP. J Phys Chem B 2022; 126:4184-4188. [PMID: 35657700 DOI: 10.1021/acs.jpcb.2c00643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Protein dynamics plays a key role in live cell functioning, stimulating the development of new experimental techniques for studying protein transport phenomena. Here, we introduce a relaxation method that is based on the rapid formation of a nonequilibrium concentration profile of the enhanced green fluorescent protein (EGFP) across a sample by its oxidative green-to-red photoconversion. Following the blue-light irradiation of a part of a sample containing EGFP and an oxidant, the diffusion-controlled response of a system is monitored. Changes in the concentration of the initial green-emitting and oxidized red-emitting forms are simultaneously tracked by fluorescence lifetime measurements using the time-correlated single photon counting. We show that the diffusion coefficient of EGFP in water, determined by this method, is in good agreement with previously published data. This approach opens a way for the studies of intracellular viscosity changes combined with sensing of elevated levels of reactive oxygen species.
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Affiliation(s)
- Vladimir E Bochenkov
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Nina S Sopova
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Aleksander M Shakhov
- N.N. Semenov Federal Research Center for Chemical Physics of RAS, 119991 Moscow, Russia
| | - Artyom A Astafiev
- N.N. Semenov Federal Research Center for Chemical Physics of RAS, 119991 Moscow, Russia
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17
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Give or Take: Effects of Electron-Accepting/-Withdrawing Groups in Red-Fluorescent BODIPY Molecular Rotors. MOLECULES (BASEL, SWITZERLAND) 2021; 27:molecules27010023. [PMID: 35011252 PMCID: PMC8746292 DOI: 10.3390/molecules27010023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/09/2021] [Accepted: 12/16/2021] [Indexed: 01/12/2023]
Abstract
Mapping microviscosity, temperature, and polarity in biosystems is an important capability that can aid in disease detection. This can be achieved using fluorescent sensors based on a green-emitting BODIPY group. However, red fluorescent sensors are desired for convenient imaging of biological samples. It is known that phenyl substituents in the β position of the BODIPY core can shift the fluorescence spectra to longer wavelengths. In this research, we report how electron-withdrawing (EWG) and -donating (EDG) groups can change the spectral and sensory properties of β-phenyl-substituted BODIPYs. We present a trifluoromethyl-substituted (EWG) conjugate with moderate temperature sensing properties and a methoxy-substituted (EDG) molecule that could be used as a lifetime-based polarity probe. In this study, we utilise experimental results of steady-state and time-resolved fluorescence, as well as quantum chemical calculations using density functional theory (DFT). We also explain how the energy barrier height (Ea) for non-radiative relaxation affects the probe’s sensitivity to temperature and viscosity and provide appropriate Ea ranges for the best possible sensitivity to viscosity and temperature.
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18
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A novel near-infrared viscosity probe based on synergistic effect of AIE property and molecular rotors for mitophagy imaging during liver injury. Anal Chim Acta 2021; 1187:339146. [PMID: 34753564 DOI: 10.1016/j.aca.2021.339146] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/28/2021] [Accepted: 10/03/2021] [Indexed: 11/21/2022]
Abstract
Mitophagy, a specialized form of autophagy, holds the key to cellular metabolism and physiology. Viscosity is a significant marker for visualization of the mitophagy process in real-time. Hence, development of well-performing viscosity probe is beneficial to study mitophagy-related dynamic physiological and pathological processes. Here, a new strategy was proposed by combination of AIE property and molecular rotors to design novel viscosity probe. The probe named TPA-Py was obtained by Knoevenagel condensation reaction of AIE unit and pyridine salt, which giving the probe excellent near-infrared emission, good water-solubility and mitochondrial targeting ability. Most importantly, TPA-Py owns two rotatable parts of triphenylamine and double bond, enabling the probe to equip with AIE property and sensitive recognition units for viscosity. With the environmental viscosity increasing, the rotation of the molecular rotor and the AIE unit is restricted effectively, the probe displayed strong fluorescence. Then, TPA-Py was successfully employed for monitoring the mitophagy process in A549 cells by imaging viscosity alterations. As mitophagy constitutes an important consideration in the pathogenesis of drug-induced liver injury, TPA-Py was also applied to explore the variation of viscosity in production and remediation pathways of APAP-induced liver injury. These results demonstrated that TPA-Py was a highly sensitive viscosity probe which holds great potential of biological applications.
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19
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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] [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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20
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Maleckaitė K, Dodonova J, Toliautas S, Žilėnaitė R, Jurgutis D, Karabanovas V, Tumkevičius S, Vyšniauskas A. Designing a Red-Emitting Viscosity-Sensitive BODIPY Fluorophore for Intracellular Viscosity Imaging. Chemistry 2021; 27:16768-16775. [PMID: 34553449 DOI: 10.1002/chem.202102743] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Indexed: 11/11/2022]
Abstract
Viscosity imaging at a microscopic scale can provide important information about biosystems, including the development of serious illnesses. Microviscosity imaging is achievable with viscosity-sensitive fluorophores, the most popular of which are based on the BODIPY group. However, most of the BODIPY probes fluoresce green light, whereas the red luminescence is desired for the imaging of biological samples. Designing a new viscosity probe with suitable spectroscopic properties is a challenging task because it is difficult to preserve viscosity sensitivity after modifying the molecular structure. Here we describe how we developed a new red-emitting, viscosity-sensitive, BODIPY fluorophore BP-PH-2M-NO2 that is suitable for reliable intracellular viscosity imaging of lipid droplets in MCF-7 breast cancer cells. The design of BP-PH-2M-NO2 was aided by DFT calculations that allowed a successful prediction of the viscosity sensitivity of fluorophores before synthesis. In summary, we report a new red viscosity probe possessing monoexponential fluorescence decay that makes it attractive for lifetime-based viscosity imaging.
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Affiliation(s)
- Karolina Maleckaitė
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, LT, 10257, Lithuania
| | - Jelena Dodonova
- Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko str. 24, Vilnius, LT, 03225, Lithuania
| | - Stepas Toliautas
- Institute of Chemical Physics, Faculty of Physics, Vilnius University, Saulėtekio av. 9-III, Vilnius, LT, 10222, Lithuania
| | - Rugilė Žilėnaitė
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, LT, 10257, Lithuania
| | - Džiugas Jurgutis
- Biomedical Physics Laboratory, National Cancer Institute, P. Baublio str. 3b, Vilnius, LT, 08406, Lithuania
| | - Vitalijus Karabanovas
- Biomedical Physics Laboratory, National Cancer Institute, P. Baublio str. 3b, Vilnius, LT, 08406, Lithuania.,Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, Saulėtekio av. 11, Vilnius, LT, 10223, Lithuania
| | - Sigitas Tumkevičius
- Institute of Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko str. 24, Vilnius, LT, 03225, Lithuania
| | - Aurimas Vyšniauskas
- Center of Physical Sciences and Technology, Saulėtekio av. 3, Vilnius, LT, 10257, Lithuania
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21
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Remarkable Increase of Fluorescence Quantum Efficiency by Cyano Substitution on an ESIPT Molecule 2-(2-Hydroxyphenyl)benzothiazole: A Highly Photoluminescent Liquid Crystal Dopant. CRYSTALS 2021. [DOI: 10.3390/cryst11091105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Fluorescent molecules with excited-state intramolecular proton transfer (ESIPT) character allow the efficient solid-state luminescence with large Stokes shift that is important for various applications, such as organic electronics, photonics, and bio-imaging fields. However, the lower fluorescence quantum yields (ΦFL) in the solution or viscous media, due to their structural relaxations in the excited state to reach the S0/S1 conical intersection, shackle further applications of ESIPT-active luminophores. Here we report that the introduction of a cyano group (-CN) into the phenyl group of 2-(2-hydroxyphenyl)benzothiazole (HBT), a representative ESIPT compound, remarkably increase its fluorescence quantum yield (ΦFL) from 0.01 (without -CN) to 0.49 (with -CN) in CH2Cl2, without disturbing its high ΦFL (=0.52) in the solid state. The large increase of the solution-state ΦFL of the cyano-substituted HBT (CN-HBT) is remarkable, comparing with our previously reported ΦFL values of 0.05 (with 4-pentylphenyl), 0.07 (with 1-hexynyl), and 0.15 (with 4-pentylphenylethynyl). Of interest, the newly-synthesized compound, CN-HBT, is miscible in a conventional room-temperature nematic liquid crystal (LC), 4-pentyl-4′-cyano biphenyl (5CB), up to 1 wt% (~1 mol%), and exhibits a large ΦFL of 0.57 in the viscous LC medium. A similar ΦFL value of ΦFL = 0.53 was also recorded in another room-temperature LC, trans-4-(4-pentylcyclohexyl)benzonitrile (PCH5), with a doping ratio of 0.5 wt% (~0.5 mol%). These 5CB/CN-HBT and PCH5/CN-HBT mixtures serve as light-emitting room-temperature LCs, and show anisotropic fluorescence with the dichroic ratio of 3.1 upon polarized excitation, as well as electric field response of luminescence intensity changes.
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22
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Maillard J, Rumble CA, Fürstenberg A. Red-Emitting Fluorophores as Local Water-Sensing Probes. J Phys Chem B 2021; 125:9727-9737. [PMID: 34406003 DOI: 10.1021/acs.jpcb.1c05773] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Fluorescent probes are known for their ability to sense changes in their direct environment. We introduce here the idea that common red-emitting fluorophores recommended for biological labeling and typically used for simple visualization of biomolecules can also act as reporters of the water content in their first solvent sphere by a simple measurement of their fluorescence lifetime. Using fluorescence spectroscopy, we investigated the excited-state dynamics of seven commercially available fluorophores emitting between 650 and 800 nm that are efficiently quenched by H2O. The amount of H2O in their direct surrounding was modulated in homogeneous H2O-D2O mixtures or, in heterogeneous systems, by confining them into reverse micelles, by encapsulating them into host-guest complexes with cyclodextrins, or by attaching them to peptides and proteins. We found that their fluorescence properties can be rationalized in terms of the amount of H2O in their direct surroundings, which provides a general mechanism for protein-induced fluorescence enhancements of red-emitting dyes and opens perspectives for directly counting water molecules in key biological environments or in polymers.
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Affiliation(s)
| | - Christopher A Rumble
- Department of Chemistry, The Pennsylvania State University, Altoona College, 3000 Ivyside Park, Altoona, Pennsylvania 16601, United States
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23
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Quan W, Zhang G, Huang L, Song W, Lin W. A novel fluorescent probe for high-fidelity imaging of mitochondria viscosity changes. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115973] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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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] [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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25
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Hao Q, Li C, Niu J, Yang R, Yu X. Construction of fluorescent rotors with multiple intramolecular rotation sites for visualization of cellular viscous compartments with elevated fidelity. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1132-1137. [PMID: 33595554 DOI: 10.1039/d0ay02247k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Viscosity-sensitive fluorescent dyes are widely utilized to image viscous intracellular compartments with high fidelity. However, the sensitivity of many fluorescent rotors needs improvement for bioimaging applications. Herein, we proposed to construct a fluorescent rotor with multiple intramolecular rotation sites to elevate its sensitivity to environmental viscosity. The fabricated fluorescent rotor showed evidently increased sensitivity to viscosity and had the potential to image intracellular viscous compartments with improved fidelity. By decorating the rotor with sidechains of different lengths, we successfully fabricated two fluorescent probes, TAPI-6 and TAPI-16, to visualize the mitochondria and plasma membrane, respectively, with high fidelity. The two probes were also successfully utilized to clearly visualize the mitochondria and plasma membranes in skeletal muscle tissue, cardiac muscle tissue, and liver tissue, demonstrating the potential of the fluorescent rotor for bioimaging applications. We believe that the strategy of increasing the sensitivity to viscosity using multiple rotation sites is valuable for the construction of fluorescent rotors, and the presented fluorescent probes in this work can serve as powerful tools for biological research.
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Affiliation(s)
- Qiuhua Hao
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
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26
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Xiao H, Li P, Tang B. Small Molecular Fluorescent Probes for Imaging of Viscosity in Living Biosystems. Chemistry 2021; 27:6880-6898. [DOI: 10.1002/chem.202004888] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 12/15/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Haibin Xiao
- School of Chemistry and Chemical Engineering Shandong University of Technology Zibo 255049 P. R. China
- College of Chemistry, Chemical Engineering and Materials Science Institute of Biomedical Sciences Shandong Normal University Jinan 250014 P. R. China
| | - Ping Li
- College of Chemistry, Chemical Engineering and Materials Science Institute of Biomedical Sciences Shandong Normal University Jinan 250014 P. R. China
| | - Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science Institute of Biomedical Sciences Shandong Normal University Jinan 250014 P. R. China
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27
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McClements DJ. Food hydrocolloids: Application as functional ingredients to control lipid digestion and bioavailability. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106404] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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28
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Suhina T, Bonn D, Weber B, Brouwer AM. Photophysics of Fluorescent Contact Sensors Based on the Dicyanodihydrofuran Motif. Chemphyschem 2021; 22:221-227. [PMID: 33210435 PMCID: PMC7898878 DOI: 10.1002/cphc.202000860] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 11/12/2020] [Indexed: 11/10/2022]
Abstract
Fluorescent molecular rotors have been used for measurements of local mobility on molecular length scales, for example to determine viscosity, and for the visualization of contact between two surfaces. In the present work, we deepen our insight into the excited-state deactivation kinetics and mechanics of dicyanodihydrofuran-based molecular rotors. We extend the scope of the use of this class of rotors for contact sensing with a red-shifted member of the family. This allows for contact detection with a range of excitation wavelengths up to ∼600 nm. Steady-state fluorescence shows that the fluorescence quantum yield of these rotors depends not only on the rigidity of their environment, but - under certain conditions - also on its polarity. While excited state decay via rotation about the exocyclic double bond is rapid in nonpolar solvents and twisting of a single bond allows for fast decay in polar solvents, the barriers for both processes are significant in solvents of intermediate polarity. This effect may also occur in other molecular rotors, and it should be considered when applying such molecules as local mobility probes.
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Affiliation(s)
- Tomislav Suhina
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
- Institute of PhysicsUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Daniel Bonn
- Institute of PhysicsUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Bart Weber
- Institute of PhysicsUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Albert M. Brouwer
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
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29
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Danylchuk DI, Jouard PH, Klymchenko AS. Targeted Solvatochromic Fluorescent Probes for Imaging Lipid Order in Organelles under Oxidative and Mechanical Stress. J Am Chem Soc 2021; 143:912-924. [DOI: 10.1021/jacs.0c10972] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Dmytro I. Danylchuk
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
| | - Pierre-Henri Jouard
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
| | - Andrey S. Klymchenko
- Laboratoire de Bioimagerie et Pathologies, UMR 7021 CNRS, Université de Strasbourg, 74 Route du Rhin, 67401 Illkirch, France
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30
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Evans JD, Krause S, Feringa BL. Cooperative and synchronized rotation in motorized porous frameworks: impact on local and global transport properties of confined fluids. Faraday Discuss 2021; 225:286-300. [DOI: 10.1039/d0fd00016g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Simulations reveal the influence of rotating molecular motors and the importance of orientation and directionality for altering the transport properties of fluids. This has outlined that motors with specific rotation can generate directed diffusion.
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Affiliation(s)
- Jack D. Evans
- Department of Inorganic Chemistry
- Technische Universität Dresden
- 01062 Dresden
- Germany
| | - Simon Krause
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- University of Groningen
- Groningen
- The Netherlands
| | - Ben L. Feringa
- Centre for Systems Chemistry
- Stratingh Institute for Chemistry
- University of Groningen
- Groningen
- The Netherlands
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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] [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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Molecular rotor as a structural probe of glucan polymers: Amylopectin, phytoglycogen, and their β-limit dextrins as models. Carbohydr Polym 2020; 250:116859. [PMID: 33049814 DOI: 10.1016/j.carbpol.2020.116859] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 07/24/2020] [Accepted: 07/30/2020] [Indexed: 11/20/2022]
Abstract
Fluorescence emissions of molecular rotors (MRs) are affected by local restrictions to molecular motion, and therefore it was considered that MRs can be used as structural probes of biopolymers. In this study, 9-(2-carboxy-2-cyanovinyl)-julolidine (CCVJ), a hydrophilic MR, was used to differentiate branched α-D-glucans, including amylopectin, phytoglycogen, and their β-limit dextrins. CCVJ emissions of glucan dispersions were correlated with dispersion viscosities and glucan branch structures. In diluted glucan dispersions, CCVJ emission showed essentially linear correlation with glucan content. In concentrated glucan dispersions, CCVJ emission correlated with viscosity in a double-logarithmic linear pattern, with phytoglycogen showing much greater sensitivities than amylopectin. In the plots of CCVJ emission vs. molar amount of branch, phytoglycogen materials showed greater slopes than their amylopectin counterparts, suggesting evident effects of branch structure on the restrictions to CCVJ molecules. Overall, CCVJ has demonstrated its fluorescent sensitivity with glucans, showing strong potentials as a structural probe of biopolymers.
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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. JOURNAL OF BIOMEDICAL OPTICS 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] [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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34
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Sharma S, Wei Z, Grozema FC, Sengupta S. Structure-property relationships in multi-stimuli responsive BODIPY-biphenyl-benzodithiophene TICT rigidochromic rotors exhibiting (pseudo-)Stokes shifts up to 221 nm. Phys Chem Chem Phys 2020; 22:25514-25521. [PMID: 33164016 DOI: 10.1039/d0cp04579a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structure-property relationships of donor-π-acceptor (D-π-A) type molecular dyad (pp-AD) and triads (pp-ADA and Me-pp-ADA) based on benzodithiophene and BODIPY with biphenyl spacers have been reported. Rotors pp-AD and pp-ADA showed efficient twisted intramolecular charge transfer (TICT) with near infrared (NIR) emissions at ∼712 nm and ∼725 nm with (pseudo-)Stokes shifts of ∼208 nm and ∼221 nm, respectively, and prominent solvatochromism. A structurally similar triad, Me-pp-ADA, with tetramethyl substituents on the BODIPY core instead was TICT inactive and exhibited excitation energy transfer with a transfer efficiency of ∼88% as revealed using steady state emission and transient absorption measurements. Rotors pp-AD and pp-ADA showed NIR emission with an enhancement in intensity with the addition of water in THF solution as well as a pronounced change in emission intensity with temperature and viscosity variations, which justify their utility as temperature and viscosity sensors. Furthermore, the linear correlation of lifetime with fluorescence intensity ratios of the donor and acceptor justifies the rigidochromic behaviour of these rotors.
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Affiliation(s)
- Sushil Sharma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City, Sector 81, Punjab-140306, India.
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35
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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] [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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36
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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 LETTERS 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] [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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37
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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] [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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38
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Kijak M, Nawara K, Listkowski A, Masiera N, Buczyńska J, Urbańska N, Orzanowska G, Pietraszkiewicz M, Waluk J. 2 + 2 Can Make Nearly a Thousand! Comparison of Di- and Tetra- Meso-Alkyl-Substituted Porphycenes. J Phys Chem A 2020; 124:4594-4604. [PMID: 32423205 PMCID: PMC7590974 DOI: 10.1021/acs.jpca.0c02155] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two porphycenes, substituted at the meso positions with two and four methyl groups, respectively, reveal similar absorption spectra, but their photophysical properties are completely different. 9,20-dimethylporphycene emits fluorescence with about 20% quantum yield, independent of the solvent. In contrast, fluorescence of 9,10,19,20-tetramethylporphycene is extremely weak in nonviscous solvents, but it can be recovered by placing the chromophore in a rigid environment. We propose a model that explains these differences, based on calculations and structural analogies with other extremely weakly emitting derivatives, dibenzo[cde,mno]porphycenes. The efficient S1 deactivation involves delocalization of two inner cavity protons coupled with proton translocation toward a high-energy cis tautomer. The latter process leads to distortion from planarity. The probability of deactivation increases with the strength of the intramolecular NH···N hydrogen bonds. The model also explains the observation of biexponential fluorescence decay in weakly emitting porphycenes. It can be extended to other derivatives, in particular, the asymmetrically substituted ones. We also point to the possibility of using specific porphycenes as viscosity sensors, in particular, when working in single molecule regime.
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Affiliation(s)
- Michał Kijak
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Krzysztof Nawara
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.,Faculty of Mathematics and Science, Cardinal Stefan Wyszyński University, Dewajtis 5, 01-815 Warsaw, Poland
| | - Arkadiusz Listkowski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.,Faculty of Mathematics and Science, Cardinal Stefan Wyszyński University, Dewajtis 5, 01-815 Warsaw, Poland
| | - Natalia Masiera
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Joanna Buczyńska
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Natalia Urbańska
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Grażyna Orzanowska
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Marek Pietraszkiewicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Jacek Waluk
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.,Faculty of Mathematics and Science, Cardinal Stefan Wyszyński University, Dewajtis 5, 01-815 Warsaw, Poland
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39
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Güixens-Gallardo P, Humpolickova J, Miclea SP, Pohl R, Kraus T, Jurkiewicz P, Hof M, Hocek M. Thiophene-linked tetramethylbodipy-labeled nucleotide for viscosity-sensitive oligonucleotide probes of hybridization and protein-DNA interactions. Org Biomol Chem 2020; 18:912-919. [PMID: 31919486 DOI: 10.1039/c9ob02634g] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Cytosine 2'-deoxyribonucleoside dCTBdp and its triphosphate (dCTBdpTP) bearing tetramethylated thiophene-bodipy fluorophore attached at position 5 were designed and synthesized. The green fluorescent nucleoside dCTBdp showed a perfect dependence of fluorescence lifetime on the viscosity. The modified triphosphate dCTBdpTP was substrate to several DNA polymerases and was used for in vitro enzymatic synthesis of labeled oligonucleotides (ONs) or DNA by primer extension. The labeled single-stranded ONs showed a significant decrease in mean fluorescence lifetime when hybridized to the complementary strand of DNA or RNA and were also sensitive to mismatches. The labeled dsDNA sensed protein binding (p53), which resulted in the increase of its fluorescence lifetime. The triphosphate dCTBdpTP was transported to live cells where its interactions could be detected by FLIM but it did not show incorporation to genomic DNA in cellulo.
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Affiliation(s)
- Pedro Güixens-Gallardo
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic. and Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, CZ-12843 Prague 2, Czech Republic
| | - Jana Humpolickova
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic.
| | - Sebastian Paul Miclea
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic.
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic.
| | - Tomáš Kraus
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic.
| | - Piotr Jurkiewicz
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejskova 3, 18223 Prague 8, Czech Republic
| | - Martin Hof
- J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences, Dolejskova 3, 18223 Prague 8, Czech Republic
| | - Michal Hocek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic. and Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, CZ-12843 Prague 2, Czech Republic
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40
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Polita A, Toliautas S, Žvirblis R, Vyšniauskas A. The effect of solvent polarity and macromolecular crowding on the viscosity sensitivity of a molecular rotor BODIPY-C10. Phys Chem Chem Phys 2020; 22:8296-8303. [DOI: 10.1039/c9cp06865a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Viscosity is the key parameter of many biological systems such as live cells. It can be conveniently measured with ‘molecular rotors’ – fluorescent sensors of microviscosity. Here, we investigate one of the most applied molecular rotors BODIPY-C10.
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Affiliation(s)
- Artūras Polita
- Center of Physical Sciences and Technology
- Vilnius
- Lithuania
| | - Stepas Toliautas
- Institute of Chemical Physics
- Faculty of Physics
- Vilnius University
- 10222 Vilnius
- Lithuania
| | - Rokas Žvirblis
- Center of Physical Sciences and Technology
- Vilnius
- Lithuania
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41
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Darvin JR, Berg MA. Micelle Heterogeneity from the 2D Kinetics of Solute Rotation. J Phys Chem Lett 2019; 10:6885-6891. [PMID: 31618033 DOI: 10.1021/acs.jpclett.9b02783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The chemical and physical properties of microstructured materials vary with position. The photophysics of solute molecules can measure these local properties, but they often show multiple rates (rate dispersion), which complicates the interpretation. In the case of micelles, rate dispersion in a solute's anisotropy decay has been assigned to either local anisotropy or heterogeneity in the local viscosity. To resolve this conflict, the rotation of PM597 molecules in SDS micelles has been measured by polarized MUPPETS (multiple population-period transient spectroscopy). This 2D technique shows that heterogeneity is strong and that local anisotropy is minimal. The results suggest that on a subnanosecond time scale, the solute sees only one strong fluctuation of the micelle structure. The anisotropic, average structure emerges on longer time scales.
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Affiliation(s)
- Jason R Darvin
- Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States
| | - Mark A Berg
- Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States
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42
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Aswathy PR, Sharma S, Tripathi NP, Sengupta S. Regioisomeric BODIPY Benzodithiophene Dyads and Triads with Tunable Red Emission as Ratiometric Temperature and Viscosity Sensors. Chemistry 2019; 25:14870-14880. [DOI: 10.1002/chem.201902952] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/17/2019] [Indexed: 02/06/2023]
Affiliation(s)
- P. R. Aswathy
- Department of Chemical SciencesIndian Institute of Science, Education and Research (IISER) Mohali Punjab 140306 India
| | - Sushil Sharma
- Department of Chemical SciencesIndian Institute of Science, Education and Research (IISER) Mohali Punjab 140306 India
| | - Narendra Pratap Tripathi
- Department of Chemical SciencesIndian Institute of Science, Education and Research (IISER) Mohali Punjab 140306 India
| | - Sanchita Sengupta
- Department of Chemical SciencesIndian Institute of Science, Education and Research (IISER) Mohali Punjab 140306 India
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43
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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44
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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] [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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