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Su L, Wang J, Liu B, Liu H, Chen Q, Liu J, Li S, Yuan L, An L, Lin H, Feng L, Zheng J, Ren J, Liang L, Li S. Construction of a Near-Infrared Fluorescent Probe for Dynamic Monitoring and Early Diagnosis of Heart Failure. ACS Sens 2024; 9:3075-3084. [PMID: 38807573 DOI: 10.1021/acssensors.4c00258] [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] [Indexed: 05/30/2024]
Abstract
Cardiac hypertrophy characterized by abnormal cardiomyocyte viscosity is a typical sign of heart failure (HF) with vital importance for early diagnosis. However, current biochemical and imaging diagnostic methods are unable to detect this subclinical manifestation. In this work, we developed a series of NIR-I fluorescence probes for detecting myocardial viscosity based on the pyridazinone scaffold. The probes showed weak fluorescence due to free intramolecular rotation under low-viscosity conditions, while they displayed strong fluorescence with limited intramolecular rotation in response to a high-viscosity environment. Among them, CarVis2 exhibited higher stability and photobleaching resistance than commercial dyes. Its specific response to viscosity was not influenced by the pH and biological species. Furthermore, CarVis2 showed rapid and accurate responses to the viscosity of isoproterenol (ISO)-treated H9C2 cardiomyocytes with good biocompatibility. More importantly, CarVis2 demonstrated excellent sensitivity in monitoring myocardial viscosity variation in HF mice in vivo, potentially enabling earlier noninvasive identification of myocardial abnormalities compared to traditional clinical imaging and biomarkers. These findings revealed that CarVis2 can serve as a powerful tool to monitor myocardial viscosity, providing the potential to advance insights into a pathophysiological mechanism and offering a new reference strategy for early visual diagnosis of HF.
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Affiliation(s)
- Lina Su
- Heart Failure Center, Department of Cardiology, China-Japan Friendship Hospital, Beijing 100029, China
- Department of Cardiology, Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing 100044, China
| | - Junda Wang
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Bowei Liu
- Heart Failure Center, Department of Cardiology, China-Japan Friendship Hospital, Beijing 100029, China
| | - Hui Liu
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Qixin Chen
- Department of Cardiology, Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing 100044, China
| | - Jiang Liu
- Heart Failure Center, Department of Cardiology, China-Japan Friendship Hospital, Beijing 100029, China
| | - Shuolei Li
- Laboratory Animal Unit, Peking University People's Hospital, Beijing 100044, China
| | - Lan Yuan
- Medical and Healthy Analytical Center, Peking University, Beijing 100191, China
| | - Lihua An
- Medical and Healthy Analytical Center, Peking University, Beijing 100191, China
| | - Hang Lin
- Department of Cardiology, Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing 100044, China
| | - Lina Feng
- Heart Failure Center, Department of Cardiology, China-Japan Friendship Hospital, Beijing 100029, China
| | - Jingang Zheng
- Heart Failure Center, Department of Cardiology, China-Japan Friendship Hospital, Beijing 100029, China
| | - Jingyi Ren
- Heart Failure Center, Department of Cardiology, China-Japan Friendship Hospital, Beijing 100029, China
| | - Lei Liang
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
| | - Sufang Li
- Department of Cardiology, Beijing Key Laboratory of Early Prediction and Intervention of Acute Myocardial Infarction, Center for Cardiovascular Translational Research, Peking University People's Hospital, Beijing 100044, China
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2
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Maller C, Schedel F, Köhn M. A Modular Approach for the Synthesis of Diverse Heterobifunctional Cyanine Dyes. J Org Chem 2024; 89:3844-3856. [PMID: 38413005 PMCID: PMC10949230 DOI: 10.1021/acs.joc.3c02673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/07/2024] [Accepted: 02/13/2024] [Indexed: 02/29/2024]
Abstract
Herein, we present a straightforward synthetic route for the design and synthesis of diverse heterobifunctional cyanine 5 dyes. We optimized the workup by harnessing the pH- and functional group-dependent solubility of the asymmetric cyanine 5 dyes. Therefore, purification through chromatography is deferred until the last synthesis step. Demonstrating successful large-scale synthesis, our modular approach prevents functional group degradation by introducing them in the last synthesis step. These modifiable heterobifunctional dyes offer significant utility in advancing biological studies.
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Affiliation(s)
- Corina Maller
- Signalling
Research Centres BIOSS and CIBSS, University
of Freiburg, Freiburg 79104, Germany
- Faculty
of Chemistry and Pharmacy, University of
Freiburg, Freiburg 79104, Germany
- Faculty
of Biology, University of Freiburg, Freiburg 79104, Germany
| | - Franziska Schedel
- Signalling
Research Centres BIOSS and CIBSS, University
of Freiburg, Freiburg 79104, Germany
- Faculty
of Chemistry and Pharmacy, University of
Freiburg, Freiburg 79104, Germany
- Faculty
of Biology, University of Freiburg, Freiburg 79104, Germany
- Spermann
Graduate School of Biology and Medicine (SGBM), University of Freiburg, Freiburg 79104, Germany
| | - Maja Köhn
- Signalling
Research Centres BIOSS and CIBSS, University
of Freiburg, Freiburg 79104, Germany
- Faculty
of Biology, University of Freiburg, Freiburg 79104, Germany
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3
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Synthesis and photophysical investigations of pyridine-pyrazolate bound boron(III) diaryl complexes. Sci Rep 2022; 12:16482. [PMID: 36183021 PMCID: PMC9526719 DOI: 10.1038/s41598-022-20796-2] [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: 08/09/2022] [Accepted: 09/19/2022] [Indexed: 11/09/2022] Open
Abstract
This study presents the design and synthetic pathway of unsymmetric ligands based on pyridine-pyrazolate scaffold with Donor-Acceptor (D-A) molecular arrays and their boron complexes to achieve a large Stokes shift. Intermolecular charge transfer (ICT) triggered by the uneven molecular charge distribution from electronically dense pyrazolate (donor) part of the ligands to electron-deficient boron centre (acceptor) resulted in a mega Stokes shift up to 263 nm for selected compounds while retaining the characteristic quantum efficiency and chemical stability. The photophysical properties of derivatization of pyrazolate group in the pyridine-pyrazolate scaffold of diaryl boron complexes were explored based on UV-Visible, steady-state and time-resolved fluorescence spectroscopy. An interesting dual emission along with quenching behaviour was also observed for 2-(6-methoxynaphthelene) 5-(2-pyridyl) pyrazolate boron complex (P5) due to the formation of a twisted intermolecular charge transfer (TICT) state from a locally excited (LE) state rendering it a potential candidate for sensing applications based on H-Bond quenching. In addition, the extended excited state lifetime of the reported compounds compared to classical boron-dipyrromethene (BODIPY) makes them suitable as potential probes for analytical applications requiring a longer excited state lifetime.
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4
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Mai DJ, Schroeder CM. 100th Anniversary of Macromolecular Science Viewpoint: Single-Molecule Studies of Synthetic Polymers. ACS Macro Lett 2020; 9:1332-1341. [PMID: 35638639 DOI: 10.1021/acsmacrolett.0c00523] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Single polymer studies have revealed unexpected and heterogeneous dynamics among identical or seemingly similar macromolecules. In recent years, direct observation of single polymers has uncovered broad distributions in molecular behavior that play a key role in determining bulk properties. Early single polymer experiments focused primarily on biological macromolecules such as DNA, but recent advances in synthesis, imaging, and force spectroscopy have enabled broad exploration of chemically diverse polymer systems. In this Viewpoint, we discuss the recent study of synthetic polymers using single-molecule methods. In terms of polymer synthesis, direct observation of single chain polymerization has revealed heterogeneity in monomer insertion events at catalytic centers and decoupling of local and global growth kinetics. In terms of single polymer visualization, recent advances in super-resolution imaging, atomic force microscopy (AFM), and liquid-cell transmission electron microscopy (LC-TEM) can resolve structure and dynamics in single synthetic chains. Moreover, single synthetic polymers can be probed in the context of bulk material environments, including hydrogels, nanostructured polymers, and crystalline polymers. In each area, we highlight key challenges and exciting opportunities in using single polymer techniques to enhance our understanding of polymer science. Overall, the expanding versatility of single polymer methods will enable the molecular-scale design and fundamental understanding of a broad range of chemically diverse and functional polymeric materials.
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Affiliation(s)
- Danielle J. Mai
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States
| | - Charles M. Schroeder
- Department of Materials Science and Engineering, Department of Chemical and Biomolecular Engineering, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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5
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Isselstein M, Zhang L, Glembockyte V, Brix O, Cosa G, Tinnefeld P, Cordes T. Self-Healing Dyes-Keeping the Promise? J Phys Chem Lett 2020; 11:4462-4480. [PMID: 32401520 DOI: 10.1021/acs.jpclett.9b03833] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Self-healing dyes have emerged as a new promising class of fluorescent labels. They consist of two units, a fluorescent dye and a photostabilizer. The latter heals whenever the fluorescent dye is in danger of taking a reaction pathway toward photobleaching. We describe the underlying concepts and summarize the developmental history and state-of-the-art, including latest applications in high-resolution microscopy, live-cell, and single-molecule imaging. We further discuss remaining limitations, which are (i) lower photostabilization of most self-healing dyes when compared to solution additives, (ii) limited mechanistic understanding on the influence of the biochemical environment and molecular oxygen on self-healing, and (iii) the lack of cheap and facile bioconjugation strategies. Finally, we provide ideas on how to further advance self-healing dyes, show new data on redox blinking caused by double-stranded DNA, and highlight forthcoming work on intramolecular photostabilization of fluorescent proteins.
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Affiliation(s)
- Michael Isselstein
- Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Großhadernerstr. 2-4, 82152 Planegg-Martinsried, Germany
| | - Lei Zhang
- Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Großhadernerstr. 2-4, 82152 Planegg-Martinsried, Germany
| | - Viktorija Glembockyte
- Department of Chemistry and Center for NanoScience, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, Haus E 81377 München, Germany
- Department of Chemistry and Quebec Centre for Applied Materials (QCAM), McGill University, 801 Sherbrooke Street W., H3A 0B8 Montreal, Quebec, Canada
| | - Oliver Brix
- Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Großhadernerstr. 2-4, 82152 Planegg-Martinsried, Germany
| | - Gonzalo Cosa
- Department of Chemistry and Quebec Centre for Applied Materials (QCAM), McGill University, 801 Sherbrooke Street W., H3A 0B8 Montreal, Quebec, Canada
| | - Philip Tinnefeld
- Department of Chemistry and Center for NanoScience, Ludwig-Maximilians-Universität München, Butenandtstr. 5-13, Haus E 81377 München, Germany
| | - Thorben Cordes
- Physical and Synthetic Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Großhadernerstr. 2-4, 82152 Planegg-Martinsried, Germany
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6
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Zhang X, Wang B, Liu Z, Zhou Y, Du L. How to Fluorescently Label the Potassium Channel: A Case in hERG. Curr Med Chem 2020; 27:3046-3054. [DOI: 10.2174/0929867326666181129094455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 11/13/2018] [Accepted: 11/22/2018] [Indexed: 11/22/2022]
Abstract
hERG (Human ether-a-go-go-related gene) potassium channel, which plays an essential
role in cardiac action potential repolarization, is responsible for inherited and druginduced
long QT syndrome. Recently, the Cryo-EM structure capturing the open conformation
of hERG channel was determined, thus pushing the study on hERG channel at 3.8 Å
resolution. This report focuses primarily on summarizing the design rationale and application
of several fluorescent probes that target hERG channels, which enables dynamic and real-time
monitoring of potassium pore channel affinity to further advance the understanding of the
channels.
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Affiliation(s)
- Xiaomeng Zhang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Beilei Wang
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Zhenzhen Liu
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
| | - Yubin Zhou
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, United States
| | - Lupei Du
- Department of Medicinal Chemistry, Key Laboratory of Chemical Biology (MOE), School of Pharmacy, Shandong University, Jinan, Shandong 250012, China
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7
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Demchenko AP. Photobleaching of organic fluorophores: quantitative characterization, mechanisms, protection. Methods Appl Fluoresc 2020; 8:022001. [PMID: 32028269 DOI: 10.1088/2050-6120/ab7365] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Photochemical stability is one of the most important parameters that determine the usefulness of organic dyes in different applications. This Review addresses key factors that determine the dye photostability. It is shown that photodegradation can follow different oxygen-dependent and oxygen-independent mechanisms and may involve both 1S1-3T1 and higher-energy 1Sn-3Tn excited states. Their involvement and contribution depends on dye structure, medium conditions, irradiation power. Fluorescein, rhodamine, BODIPY and cyanine dyes, as well as conjugated polymers are discussed as selected examples illustrating photobleaching mechanisms. The strategies for modulating and improving the photostability are overviewed. They include the improvement of fluorophore design, particularly by attaching protective and anti-fading groups, creating proper medium conditions in liquid, solid and nanoscale environments. The special conditions for biological labeling, sensing and imaging are outlined.
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Affiliation(s)
- Alexander P Demchenko
- Palladin Institute of Biochemistry, Leontovicha st. 9, Kyiv 01030, Ukraine. Yuriy Fedkovych National University, Chernivtsi, 58012, Ukraine
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8
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Karlsson JKG, Laude A, Hall MJ, Harriman A. Photo-isomerization of the Cyanine Dye Alexa-Fluor 647 (AF-647) in the Context of dSTORM Super-Resolution Microscopy. Chemistry 2019; 25:14983-14998. [PMID: 31515919 DOI: 10.1002/chem.201904117] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Indexed: 02/06/2023]
Abstract
Cyanine dyes, as used in super-resolution fluorescence microscopy, undergo light-induced "blinking", enabling localization of fluorophores with spatial resolution beyond the optical diffraction limit. Despite a plethora of studies, the molecular origins of this blinking are not well understood. Here, we examine the photophysical properties of a bio-conjugate cyanine dye (AF-647), used extensively in dSTORM imaging. In the absence of a potent sacrificial reductant, light-induced electron transfer and intermediates formed via the metastable, triplet excited state are considered unlikely to play a significant role in the blinking events. Instead, it is found that, under conditions appropriate to dSTORM microscopy, AF-647 undergoes reversible photo-induced isomerization to at least two long-lived dark species. These photo-isomers are characterized spectroscopically and their interconversion probed by computational means. The first-formed isomer is light sensitive and transforms to a longer-lived species in modest yield that could be involved in dSTORM related blinking. Permanent photobleaching of AF-647 occurs with very low quantum yield and is partially suppressed by the anaerobic redox buffer.
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Affiliation(s)
- Joshua K G Karlsson
- Molecular Photonics Laboratory, SNES, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Alex Laude
- Bio-Imaging Unit, Medical School, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Michael J Hall
- School of Natural and Environmental Sciences, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Anthony Harriman
- Molecular Photonics Laboratory, SNES, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
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9
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Abstract
Delivery of the drug to a desired point of body and controlled release of the therapeutic agent are important features, provided by drug delivery systems (DDSs), for development of today's effective medicines. A variety of nanomaterials or nanomolecules such as lipids/liposomes, nucleic acids, peptides/proteins, composites, polymers, or carbon nanotubes can be used as DDSs. Single-molecule characterization of these small materials in terms of their size, shape, surface, encapsulation efficiency, as well as interaction with the drug-receiving cell has importance for their efficiency. The loading, distribution, or leakage of the drug as well as its interaction with DDS should also be characterized. Although diverse techniques are present for characterization of specific DDS material, methods such as electron microscopy and fluorescence microscopy are widely used. In this review, the current methodologies utilized for the single-molecule characterization of mostly preferred DDS materials were presented.
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Affiliation(s)
- Sezer Okay
- Department of Vaccine Technology, Vaccine Institute, Hacettepe University, Ankara, Turkey.,Department of Biology, Faculty of Science, Çankırı Karatekin University, Çankırı, Turkey
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10
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Gong W, Das P, Samanta S, Xiong J, Pan W, Gu Z, Zhang J, Qu J, Yang Z. Redefining the photo-stability of common fluorophores with triplet state quenchers: mechanistic insights and recent updates. Chem Commun (Camb) 2019; 55:8695-8704. [PMID: 31073568 DOI: 10.1039/c9cc02616a] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Light microscopy can offer certain advantages over electron microscopy in terms of acquiring detailed insights into the biological/intra-cellular milieu. In recent years, with the development of new fluorescence imaging technologies, it has become extremely important to assess the role of designing appropriate fluorophores in acquiring desired biological information without encountering any untoward hitches. Over the years, external fluorophores have been prevalently used in fluorescence microscopy and single-molecule fluorescence microscopy-based studies. Photostable fluorogenic probes with high extinction coefficients and quantum yields, exhibiting minimum autofluorescence and photobleaching properties, are preferred in single-molecule microscopy as they can tolerate long-term laser exposure. Therefore, the development of triplet state quenchers and/or any other suitable new strategy to ensure the photo-stability of the fluorophores during long-term live cell imaging exercises is highly anticipated. In this feature article, various strategies for stabilizing fluorophores, including the mechanisms of TSQ-induced stabilization, have been thoroughly reviewed considering contemporary literature reports and applications.
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Affiliation(s)
- Wanjun Gong
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
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11
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Yang W, Wang S, Li R, Xu J, Hao W. Mechano-responsive fluorescent hyperbranched poly(amido amine)s. REACT FUNCT POLYM 2018. [DOI: 10.1016/j.reactfunctpolym.2018.10.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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12
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Kuo CT, Wu IC, Chen L, Yu J, Wu L, Chiu DT. Improving the Photostability of Semiconducting Polymer Dots Using Buffers. Anal Chem 2018; 90:11785-11790. [PMID: 30277754 DOI: 10.1021/acs.analchem.8b03104] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photostability of fluorescent probes is critical in biological imaging, especially for long-term observational analyses. Here, we describe a simple and universal method to improve the photostability of semiconducting polymer dots (Pdots) and other fluorescent probes by using buffers. Using Pdots as a model system, we found that HEPES or MES buffer can improve the photostability of Pdots by a factor of 20. Through a systematic study, we show that Pdot photobleaching is dominated by photoinduced radicals which can be quenched by the piperazine or morpholine structures of these buffers, which act as radical scavengers. For conditions where choice of buffer is limited, we designed fluorescent polymers conjugated with radical scavengers to improve Pdot photostability. We then demonstrate a practical application in which HEPES buffer is used to improve the photostability of Pdots during cell imaging.
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Affiliation(s)
- Chun-Ting Kuo
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - I-Che Wu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Lei Chen
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Jiangbo Yu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Li Wu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
| | - Daniel T Chiu
- Departments of Chemistry and Bioengineering , University of Washington , Seattle , Washington 98195 , United States
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13
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Seo SO, Lu T, Jin YS, Blaschek HP. Development of an oxygen-independent flavin mononucleotide-based fluorescent reporter system in Clostridium beijerinckii and its potential applications. J Biotechnol 2017; 265:119-126. [PMID: 29158189 DOI: 10.1016/j.jbiotec.2017.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 11/02/2017] [Accepted: 11/06/2017] [Indexed: 12/21/2022]
Abstract
Clostridium beijerinckii is a predominant solventogenic clostridia with great attraction for renewable liquid biofuel and biochemical production. Metabolic engineering and synthetic biology can be employed to engineer the strain toward desirable phenotypes. However, current limited information such as promoter strength and gene regulation may hinder the efficient engineering of the strain. To investigate genetic information and complex cellular bioprocesses of C. beijerinckii, an in vivo fluorescence reporter system can be employed. In general, green fluorescence protein (GFP) and relative analogs have been widely used as real-time reporters. However, GFP-family proteins require molecular oxygen for fluorescence maturation. Considering the strict anaerobic growth requirement of the clostridia, an oxygen-independent fluorescence reporter such as a flavin mononucleotide-based fluorescent protein (FbFP) can be used as an alternative fluorescence reporter. In this study, we synthesized and expressed the codon-optimized FbFP gene for C. beijerinckii (CbFbFP) based on the nucleotide sequence of Bacillus subtilis YtvA variant EcFbFP in C. beijerinckii NCIMB 8052 wild-type. Protein expression and in vivo fluorescence of CbFbFP in C. beijeirnckii were confirmed under anaerobic growth conditions. Through fluorescence-activated cell sorting (FACS), we isolated the bright cells from the heterogenous population of C. beijerinckii cells expressing CbFbFP. Several mutations were found in the isolated plasmid which may be responsible for the high-level expression of CbFbFP in C. beijerinckii. The mutant plasmid and CbFbFP reporter were further utilized for strain selection, real-time fluorescence measurement, population analysis, and metabolic engineering in this study.
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Affiliation(s)
- Seung-Oh Seo
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Ting Lu
- Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Department of Bioengineering and Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yong-Su Jin
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Hans P Blaschek
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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14
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Gao Z, Hao Y, Zheng M, Chen Y. A fluorescent dye with large Stokes shift and high stability: synthesis and application to live cell imaging. RSC Adv 2017. [DOI: 10.1039/c6ra27547h] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Abstract
A new fluorescent dye with large Stokes shift and excellent photo-stability for live cell imaging has been developed.
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Affiliation(s)
- Zheng Gao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- China
| | - Yongcao Hao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- China
| | - Meiling Zheng
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- China
| | - Yi Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- China
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