1
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Rajput D, Pradhan N, Mansuri S, Soppina V, Kanvah S. A multipurpose mitochondrial NIR probe for imaging ferroptosis and mitophagy. J Mater Chem B 2024; 12:4698-4707. [PMID: 38652007 DOI: 10.1039/d4tb00293h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
This paper explores the use of a di-cationic fluorophore for visualizing mitochondria in live cells independent of membrane potential. Through the synthesized di-cationic fluorophore, we investigate the monitoring of viscosity, ferroptosis, stress-induced mitophagy, and lysosomal uptake of damaged mitochondria. The designed fluorophore is based on DQAsomes, cationic vesicles responsible for transporting drugs and DNA to mitochondria. The symmetric fluorophores possess two charge centres separated by an alkyl chain and are distinguished by a pyridinium group for mitochondrial selectivity, the C-12 alkyl substitution for membrane affinity, and an electron donor-π-acceptor fluorescent scaffold for intramolecular charge transfer. The synthesized fluorophores, PP and NP, emit wavelengths exceeding 600 nm, with a significant Stokes shift (130-211 nm), and NP demonstrates near-infrared emission (∼690 nm). Our study underscores the potential of these fluorophores for live-cell imaging, examining physiological responses such as viscosity and ferroptosis, and highlights their utility in investigating mitophagy damage and lysosomal uptake.
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Affiliation(s)
- Deeksha Rajput
- Department of Chemistry, Indian Institute of Technology, Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India.
| | - Nachiket Pradhan
- Department of Chemistry, Indian Institute of Technology, Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India.
| | - Shabnam Mansuri
- Department of Chemistry, Indian Institute of Technology, Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India.
| | - Virupakshi Soppina
- Department of Biological Engineering, Indian Institute of Technology, Gandhinagar 382355, India.
| | - Sriram Kanvah
- Department of Chemistry, Indian Institute of Technology, Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India.
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2
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Ma J, Sun R, Xia K, Xia Q, Liu Y, Zhang X. Design and Application of Fluorescent Probes to Detect Cellular Physical Microenvironments. Chem Rev 2024; 124:1738-1861. [PMID: 38354333 DOI: 10.1021/acs.chemrev.3c00573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
The microenvironment is indispensable for functionality of various biomacromolecules, subcellular compartments, living cells, and organisms. In particular, physical properties within the biological microenvironment could exert profound effects on both the cellular physiology and pathology, with parameters including the polarity, viscosity, pH, and other relevant factors. There is a significant demand to directly visualize and quantitatively measure the fluctuation in the cellular microenvironment with spatiotemporal resolution. To satisfy this need, analytical methods based on fluorescence probes offer great opportunities due to the facile, sensitive, and dynamic detection that these molecules could enable in varying biological settings from in vitro samples to live animal models. Herein, we focus on various types of small molecule fluorescent probes for the detection and measurement of physical parameters of the microenvironment, including pH, polarity, viscosity, mechanical force, temperature, and electron potential. For each parameter, we primarily describe the chemical mechanisms underlying how physical properties are correlated with changes of various fluorescent signals. This review provides both an overview and a perspective for the development of small molecule fluorescent probes to visualize the dynamic changes in the cellular environment, to expand the knowledge for biological process, and to enrich diagnostic tools for human diseases.
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Affiliation(s)
- Junbao Ma
- Department of Chemistry and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China
- Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
- Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310030, Zhejiang Province, China
| | - Rui Sun
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
- University of the Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Kaifu Xia
- Department of Chemistry and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China
- Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
- Institute of Natural Sciences, Westlake Institute for Advanced Study, Hangzhou 310030, Zhejiang Province, China
| | - Qiuxuan Xia
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
- University of the Chinese Academy of Sciences, 19 A Yuquan Road, Shijingshan District, Beijing 100049, China
| | - Yu Liu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, China
- State Key Laboratory of Medical Proteomics, National Chromatographic R. & A. Center, Chinese Academy of Sciences Dalian Liaoning 116023, China
| | - Xin Zhang
- Department of Chemistry and Research Center for Industries of the Future, Westlake University, 600 Dunyu Road, Hangzhou 310030, Zhejiang Province, China
- Westlake Laboratory of Life Sciences and Biomedicine, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
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3
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Kramarova EP, Lyakhmun DN, Tarasenko DV, Borisevich SS, Khamitov EM, Yusupova AR, Korlyukov AA, Romanenko AR, Shmigol TA, Bylikin SY, Baukov YI, Negrebetsky VV. Reaction of Picolinamides with Ketones Producing a New Type of Heterocyclic Salts with an Imidazolidin-4-One Ring. Molecules 2023; 29:206. [PMID: 38202789 PMCID: PMC10780162 DOI: 10.3390/molecules29010206] [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: 11/02/2023] [Revised: 12/20/2023] [Accepted: 12/22/2023] [Indexed: 01/12/2024] Open
Abstract
Reactions of picolinamides with 1,3-propanesultone in methanol followed by the treatment with ketones led to a series of previously unknown chemical transformations, yielding first pyridinium salts (2a-f), with a protonated endocyclic nitrogen atom, and then heterocyclic salts (3a-j) containing an imidazolidin-4-one ring. The structures of intermediate and final products were determined by IR and 1H, 13C NMR spectroscopy, and X-ray study. The effects of the ketone and alcohol structures on the product yield were studied by quantum-chemical calculations. The stability of salts 3a-j towards hydrolysis and alcoholysis makes them excellent candidates for the search for new types of biologically active compounds.
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Affiliation(s)
- Eugenia P. Kramarova
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
| | - Dmitry N. Lyakhmun
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
| | - Dmitry V. Tarasenko
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
| | - Sophia S. Borisevich
- Ufa Institute of Chemistry, Oktyabrya Aven., 71, 450054 Ufa, Russia; (S.S.B.); (E.M.K.); (A.R.Y.)
| | - Edward M. Khamitov
- Ufa Institute of Chemistry, Oktyabrya Aven., 71, 450054 Ufa, Russia; (S.S.B.); (E.M.K.); (A.R.Y.)
| | - Alfia R. Yusupova
- Ufa Institute of Chemistry, Oktyabrya Aven., 71, 450054 Ufa, Russia; (S.S.B.); (E.M.K.); (A.R.Y.)
| | - Alexander A. Korlyukov
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
- A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, Bl. 1, 119334 Moscow, Russia;
| | - Alexander R. Romanenko
- A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Vavilova St. 28, Bl. 1, 119334 Moscow, Russia;
- D.I. Mendeleev Russian University of Chemical Technology, Miusskaya Sq., 9, 125047 Moscow, Russia
| | - Tatiana A. Shmigol
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
| | | | - Yuri I. Baukov
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
| | - Vadim V. Negrebetsky
- Institute of Pharmacy and Medical Chemistry, Pirogov Russian National Research Medical University, Ostrovityanov St., Bl. 1, 117997 Moscow, Russia; (E.P.K.); (D.N.L.); (D.V.T.); (A.A.K.); (T.A.S.); (Y.I.B.)
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4
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Yan P, Acker CD, Biasci V, Judge G, Monroe A, Sacconi L, Loew LM. Near-infrared voltage-sensitive dyes based on chromene donor. Proc Natl Acad Sci U S A 2023; 120:e2305093120. [PMID: 37579138 PMCID: PMC10450434 DOI: 10.1073/pnas.2305093120] [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: 03/29/2023] [Accepted: 06/29/2023] [Indexed: 08/16/2023] Open
Abstract
Voltage-sensitive dyes (VSDs) are used to image electrical activity in cells and tissues with submillisecond time resolution. Most of these fast sensors are constructed from push-pull chromophores whose fluorescence spectra are modulated by the electric field across the cell membrane. It was found that the substitution of naphthalene with chromene produces a 60 to 80 nm red-shift in absorption and emission spectra while maintaining fluorescence quantum efficiency and voltage sensitivity. One dye was applied to ex vivo murine heart with excitation at 730 nm, by far the longest wavelength reported in voltage imaging. This VSD resolves cardiac action potentials in single trials with 12% ΔF/F per action potential. The well-separated excitation spectra between these long-wavelength VSDs and channelrhodopsin (ChR2) enabled monitoring of action potential propagation in ChR2 hearts without any perturbation of electrical dynamics. Importantly, by employing spatially localized optogenetic manipulation, action potential dynamics can be assessed in an all-optical fashion with no artifact related to optical cross-talk between the reporter and actuator. These new environmentally sensitive chromene-based chromophores are also likely to have applications outside voltage imaging.
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Affiliation(s)
- Ping Yan
- Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, CT06030
| | - Corey D. Acker
- Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, CT06030
| | - Valentina Biasci
- European Laboratory for Non-Linear Spectroscopy, University of Florence, Sesto Fiorentino50019, Italy
| | - Giuliana Judge
- Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, CT06030
| | - Alexa Monroe
- Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, CT06030
| | - Leonardo Sacconi
- Institute of Clinical Physiology, National Research Council, Florence50139, Italy
- Institute for Experimental Cardiovascular Medicine, Faculty of Medicine, University of Freiburg, Freiburg79110, Germany
| | - Leslie M. Loew
- Richard D. Berlin Center for Cell Analysis and Modeling, University of Connecticut Health Center, Farmington, CT06030
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5
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Aseyev N, Ivanova V, Balaban P, Nikitin E. Current Practice in Using Voltage Imaging to Record Fast Neuronal Activity: Successful Examples from Invertebrate to Mammalian Studies. BIOSENSORS 2023; 13:648. [PMID: 37367013 DOI: 10.3390/bios13060648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/09/2023] [Accepted: 06/12/2023] [Indexed: 06/28/2023]
Abstract
The optical imaging of neuronal activity with potentiometric probes has been credited with being able to address key questions in neuroscience via the simultaneous recording of many neurons. This technique, which was pioneered 50 years ago, has allowed researchers to study the dynamics of neural activity, from tiny subthreshold synaptic events in the axon and dendrites at the subcellular level to the fluctuation of field potentials and how they spread across large areas of the brain. Initially, synthetic voltage-sensitive dyes (VSDs) were applied directly to brain tissue via staining, but recent advances in transgenic methods now allow the expression of genetically encoded voltage indicators (GEVIs), specifically in selected neuron types. However, voltage imaging is technically difficult and limited by several methodological constraints that determine its applicability in a given type of experiment. The prevalence of this method is far from being comparable to patch clamp voltage recording or similar routine methods in neuroscience research. There are more than twice as many studies on VSDs as there are on GEVIs. As can be seen from the majority of the papers, most of them are either methodological ones or reviews. However, potentiometric imaging is able to address key questions in neuroscience by recording most or many neurons simultaneously, thus providing unique information that cannot be obtained via other methods. Different types of optical voltage indicators have their advantages and limitations, which we focus on in detail. Here, we summarize the experience of the scientific community in the application of voltage imaging and try to evaluate the contribution of this method to neuroscience research.
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Affiliation(s)
- Nikolay Aseyev
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
| | - Violetta Ivanova
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
| | - Pavel Balaban
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
| | - Evgeny Nikitin
- Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Butlerova 5A, Moscow 117485, Russia
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6
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Zhao Y, Xiao C, Mejia E, Garg A, Song J, Agrawal A, Zhou W. Voltage Modulation of Nanoplasmonic Metal Luminescence from Nano-Optoelectrodes in Electrolytes. ACS NANO 2023; 17:8634-8645. [PMID: 37093562 DOI: 10.1021/acsnano.3c01491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Metallic nanostructures supporting surface plasmon modes can concentrate optical fields and enhance luminescence processes from the metal surface at plasmonic hotspots. Such nanoplasmonic metal luminescence contributes to the spectral background in surface-enhanced Raman spectroscopy (SERS) measurements and is helpful in bioimaging, nanothermometry and chemical reaction monitoring applications. Although there is growing interest in nanoplasmonic metal luminescence, its dependence on voltage modulation has received limited attention in research investigations. Also, the hyphenated electrochemical surface-enhanced Raman spectroscopy (EC-SERS) technique typically ignores voltage-dependent spectral background information associated with nanoplasmonic metal luminescence due to limited mechanistic understanding and poor measurement reproducibility. Here, we report a combined experiment and theory study on dynamic voltage-modulated nanoplasmonic metal luminescence from hotspots at the electrode-electrolyte interface using multiresonant nanolaminate nano-optoelectrode arrays. Our EC-SERS measurements under 785 nm continuous wavelength laser excitation demonstrate that short-wavenumber nanoplasmonic metal luminescence associated with plasmon-enhanced electronic Raman scattering (PE-ERS) exhibits a negative voltage modulation slope (up to ≈30% V-1) in physiological ionic solutions. Furthermore, we have developed a phenomenological model to intuitively capture the plasmonic, electronic, and ionic characteristics at the metal-electrolyte interface to understand the observed dependence of the PE-ERS voltage modulation slope on voltage polarization and ionic strength. The current work represents a critical step toward the general application of nanoplasmonic metal luminescence signals in optical voltage biosensing, hybrid optical-electrical signal transduction, and interfacial electrochemical monitoring.
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Affiliation(s)
- Yuming Zhao
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Chuan Xiao
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Elieser Mejia
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Aditya Garg
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Junyeob Song
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Amit Agrawal
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Wei Zhou
- Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
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7
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Kramarova EP, Borisevich SS, Khamitov EM, Korlyukov AA, Dorovatovskii PV, Shagina AD, Mineev KS, Tarasenko DV, Novikov RA, Lagunin AA, Boldyrev I, Ezdoglian AA, Karpechenko NY, Shmigol TA, Baukov YI, Negrebetsky VV. Pyridine Carboxamides Based on Sulfobetaines: Design, Reactivity, and Biological Activity. Molecules 2022; 27:7542. [PMID: 36364369 PMCID: PMC9658115 DOI: 10.3390/molecules27217542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 10/20/2022] [Accepted: 10/27/2022] [Indexed: 03/09/2024] Open
Abstract
The synthesis of the products of the 1,3-propanesultone ring opening during its interaction with amides of pyridinecarboxylic acids has been carried out. The dependence of the yield of the reaction products on the position (ortho-, meta-, para-) of the substituent in the heteroaromatic fragment and temperature condition was revealed. In contrast to the meta- and para-substituted substrates, the reaction involving ortho-derivatives at the boiling point of methanol unexpectedly led to the formation of a salt. On the basis of spectroscopic, X-Ray, and quantum-chemical calculation data, a model of the transition-state, as well as a mechanism for this alkylation reaction of pyridine carboxamides with sultone were proposed in order to explain the higher yields obtained with the nicotinamide and its N-methyl analog compared to ortho or meta parents. Based on the analysis of ESP maps, the positions of the binding sites of reagents with a potential complexing agent in space were determined. The in silico evaluation of possible biological activity showed that the synthetized compounds revealed some promising pharmacological effects and low acute toxicity.
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Affiliation(s)
- Eugene P. Kramarova
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Sophia S. Borisevich
- Laboratory of Physical Chemistry, Ufa Institute of Chemistry, Ufa Federal Research Center, Russian Academy of Sciences, 450071 Ufa, Russia
| | - Edward M. Khamitov
- Laboratory of Physical Chemistry, Ufa Institute of Chemistry, Ufa Federal Research Center, Russian Academy of Sciences, 450071 Ufa, Russia
| | - Alexander A. Korlyukov
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | | | - Anastasia D. Shagina
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Konstantin S. Mineev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia
| | - Dmitri V. Tarasenko
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Roman A. Novikov
- N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia
| | - Alexey A. Lagunin
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Ivan Boldyrev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia
| | - Aiarpi A. Ezdoglian
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Natalia Yu. Karpechenko
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Tatiana A. Shmigol
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Yuri I. Baukov
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
| | - Vadim V. Negrebetsky
- Department of Medical Chemistry and Toxicology, Pirogov National Research Medical University, Ministry of Health of Russia, 117997 Moscow, Russia
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8
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Yang MH, Russell JL, Mifune Y, Wang Y, Shi H, Moresco EMY, Siegwart DJ, Beutler B, Boger DL. Next-Generation Diprovocims with Potent Human and Murine TLR1/TLR2 Agonist Activity That Activate the Innate and Adaptive Immune Response. J Med Chem 2022; 65:9230-9252. [PMID: 35767437 DOI: 10.1021/acs.jmedchem.2c00419] [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
The diprovocims, a new class of toll-like receptor (TLR) agonists, bear no similarity to prior TLR agonists, act through a well-defined mechanism (TLR1/TLR2 agonist), exhibit exquisite structure-activity relationships, and display in vivo adjuvant activity. They possess potent and efficacious agonist activity toward human TLR1/TLR2 but modest agonism toward the murine receptor. A manner by which diprovocims can be functionalized without impacting hTLR1/TLR2 activity is detailed, permitting future linkage to antigenic, targeting, or delivery moieties. Improvements in both potency and its low efficacy in the murine system were also achieved, permitting more effective use in animal models while maintaining the hTLR1/TLR2 activity. The prototypical member diprovocim-X exhibits the excellent potency/efficacy of diprovocim-1 in human cells, displays substantially improved potency/efficacy in mouse macrophages, and serves as an adjuvant in mice when coadministered with a nonimmunogenic antigen, indicating stimulation of the adaptive as well as innate immune response.
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Affiliation(s)
- Ming-Hsiu Yang
- Department of Chemistry and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Jamie L Russell
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Yuto Mifune
- Department of Chemistry and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
| | - Ying Wang
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Hexin Shi
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Eva Marie Y Moresco
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Daniel J Siegwart
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Bruce Beutler
- Center for the Genetics of Host Defense, University of Texas Southwestern Medical Center, Dallas, Texas 75390, United States
| | - Dale L Boger
- Department of Chemistry and the Skaggs Institute of Chemical Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States
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9
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Bloxham W, Brinks D, Kheifets S, Cohen AE. Linearly polarized excitation enhances signals from fluorescent voltage indicators. Biophys J 2021; 120:5333-5342. [PMID: 34710379 DOI: 10.1016/j.bpj.2021.10.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/10/2021] [Accepted: 10/20/2021] [Indexed: 10/20/2022] Open
Abstract
Voltage imaging in cells requires high-speed recording of small fluorescent signals, often leading to low signal/noise ratios. Because voltage indicators are membrane bound, their orientations are partially constrained by the plane of the membrane. We explored whether tuning the linear polarization of excitation light could enhance voltage indicator fluorescence. We tested a panel of dye- and protein-based voltage indicators in mammalian cells. The dye BeRST1 showed a 73% increase in brightness between the least and most favorable polarizations. The protein-based reporter ASAP1 showed a 22% increase in brightness, and QuasAr3 showed a 14% increase in brightness. In very thin neurites expressing QuasAr3, improvements were anomalously large, with a 170% increase in brightness between polarization parallel versus perpendicular to the dendrite. Signal/noise ratios of optically recorded action potentials were increased by up to 50% in neurites expressing QuasAr3. These results demonstrate that polarization control can be a facile means to enhance signals from fluorescent voltage indicators, particularly in thin neurites or in high-background environments.
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Affiliation(s)
- William Bloxham
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts; Department of Physics, Harvard University, Cambridge, Massachusetts; Physics of Living Systems, Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts
| | - Daan Brinks
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts; Department of Imaging Physics, Delft University of Technology, Delft, the Netherlands; Department of Molecular Genetics, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Simon Kheifets
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts
| | - Adam E Cohen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts; Department of Physics, Harvard University, Cambridge, Massachusetts.
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10
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Sirbu D, Zeng L, Waddell PG, Tkachenko NV, Botchway SW, Benniston AC. Voltage-induced fluorescence lifetime imaging of a BODIPY derivative in giant unilamellar vesicles as potential neuron membrane mimics. Chem Commun (Camb) 2021; 57:12631-12634. [PMID: 34761753 DOI: 10.1039/d1cc03756k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Fluorescence lifetime imaging (FLIM) was used to study the behaviour of a BODIPY dye in a giant unilamellar vesicle (GUV) in the presence of an electric field. The modulation of the electric field resulted in distinctive fluorescence lifetime changes in line with environment alterations within the membrane mimic.
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Affiliation(s)
- Dumitru Sirbu
- School of Mathematics, Statistics & Physics, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.
| | - Lingli Zeng
- Molecular Photonics Laboratory, Chemistry-School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.
| | - Paul G Waddell
- Crystallography Laboratory, Chemistry-School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Nikolai V Tkachenko
- Faculty of Engineering and Natural Sciences, Tampere University, Tampere, Finland
| | - Stanley W Botchway
- Central Laser Facility, Rutherford Appleton Laboratory, Harwell, Oxford, OX11 0QX, UK
| | - Andrew C Benniston
- Molecular Photonics Laboratory, Chemistry-School of Natural & Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK.
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11
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Grupi A, Shapira Z, Yudovich S, Degani-Katzav N, Weiss S. Point-localized, site-specific membrane potential optical recording by single fluorescent nanodiscs. ACTA ACUST UNITED AC 2021; 1:None. [PMID: 34568861 PMCID: PMC8448295 DOI: 10.1016/j.bpr.2021.100007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 07/20/2021] [Indexed: 01/02/2023]
Abstract
Nanodisc technology was implemented as a platform for voltage nanosensors. A fluorescence (Förster) resonance energy transfer (FRET)- based voltage-sensing scheme employing fluorescent nanodiscs and the hydrophobic ion dipicrylamine was developed and utilized to optically record membrane potentials on the single-nanodisc level. Ensemble and single-nanosensor recordings were demonstrated for HEK293 cells and primary cortical neuron cells. Conjugation of nanodiscs to anti-GABAA antibodies allowed for site-specific membrane potential measurements from postsynaptic sites.
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Affiliation(s)
- Asaf Grupi
- Department of Physics, Institute for Nanotechnology and Advanced Materials.,Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, Israel
| | - Zehavit Shapira
- Department of Physics, Institute for Nanotechnology and Advanced Materials.,Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, Israel
| | - Shimon Yudovich
- Department of Physics, Institute for Nanotechnology and Advanced Materials.,Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, Israel
| | - Nurit Degani-Katzav
- Department of Physics, Institute for Nanotechnology and Advanced Materials.,Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, Israel
| | - Shimon Weiss
- Department of Physics, Institute for Nanotechnology and Advanced Materials.,Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, Israel.,Department of Chemistry and Biochemistry.,California NanoSystems Institute, University of California Los Angeles, Los Angeles, California
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12
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Yu Q, Wang X, Nie L. Optical recording of brain functions based on voltage-sensitive dyes. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.12.060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Benlian BR, Klier PEZ, Martinez KN, Schwinn MK, Kirkland TA, Miller EW. Small Molecule-Protein Hybrid for Voltage Imaging via Quenching of Bioluminescence. ACS Sens 2021; 6:1857-1863. [PMID: 33723996 DOI: 10.1021/acssensors.1c00058] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We report a small-molecule enzyme pair for optical voltage sensing via quenching of bioluminescence. This quenching bioluminescent voltage indicator, or Q-BOLT, pairs the dark absorbing, voltage-sensitive dipicrylamine with membrane-localized bioluminescence from the luciferase NanoLuc (NLuc). As a result, bioluminescence is quenched through resonance energy transfer (QRET) as a function of membrane potential. Fusion of HaloTag to NLuc creates a two-acceptor bioluminescence resonance energy transfer (BRET) system when a tetramethylrhodamine (TMR) HaloTag ligand is ligated to HaloTag. In this mode, Q-BOLT is capable of providing direct visualization of changes in membrane potential in live cells via three distinct readouts: change in QRET, BRET, and the ratio between bioluminescence emission and BRET. Q-BOLT can provide up to a 29% change in bioluminescence (ΔBL/BL) and >100% ΔBRET/BRET per 100 mV change in HEK 293T cells, without the need for excitation light. In cardiac monolayers derived from human-induced pluripotent stem cells (hiPSCs), Q-BOLT readily reports on membrane potential oscillations. Q-BOLT is the first example of a hybrid small molecule-protein voltage indicator that does not require excitation light and may be useful in contexts where excitation light is limiting.
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Affiliation(s)
| | | | | | | | - Thomas A. Kirkland
- Promega Biosciences LLC, San Luis Obispo, California 93401, United States
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14
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Acker CD, Yan P, Loew LM. Recent progress in optical voltage-sensor technology and applications to cardiac research: from single cells to whole hearts. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2020; 154:3-10. [PMID: 31474387 PMCID: PMC7048644 DOI: 10.1016/j.pbiomolbio.2019.07.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 07/16/2019] [Accepted: 07/31/2019] [Indexed: 12/25/2022]
Abstract
The first workshop on Novel Optics-based approaches for Cardiac Electrophysiology (NOtiCE) was held in Florence Italy in 2018. Here, we learned how optical approaches have shaped our basic understanding of cardiac electrophysiology and how new technologies and approaches are being developed and validated to advance the field. Several technologies are being developed that may one day allow for new clinical approaches for diagnosing cardiac disorders and possibly intervening to treat human patients. In this review, we discuss several technologies and approaches to optical voltage imaging with voltage-sensitive dyes. We highlight the development and application of fluorinated and long wavelength voltage-sensitive dyes. These optical voltage sensors have now been applied and well validated in several different assays from cultured human stem cell-derived cardiomyocytes to whole hearts in-vivo. Imaging concepts such as dual wavelength ratiometric techniques, which are crucial to maximizing the information from optical sensors by increasing the useful signal and eliminating noise and artifacts, are presented. Finally, novel voltage sensors including photoacoustic voltage-sensitive dyes, their current capabilities and potential advantages, are introduced.
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Affiliation(s)
- Corey D Acker
- R. D. Berlin Center for Cell Analysis and Modeling, University of Connecticut School of Medicine, 400 Farmington Avenue, Farmington, CT, 06030, USA.
| | - Ping Yan
- R. D. Berlin Center for Cell Analysis and Modeling, University of Connecticut School of Medicine, 400 Farmington Avenue, Farmington, CT, 06030, USA
| | - Leslie M Loew
- R. D. Berlin Center for Cell Analysis and Modeling, University of Connecticut School of Medicine, 400 Farmington Avenue, Farmington, CT, 06030, USA
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15
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Hughes HJ, Demers SME, Zhang A, Hafner JH. The orientation of a membrane probe from structural analysis by enhanced Raman scattering. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1862:183109. [PMID: 31785235 DOI: 10.1016/j.bbamem.2019.183109] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 10/10/2019] [Accepted: 10/14/2019] [Indexed: 02/04/2023]
Abstract
Small fluorescent molecules are widely used as probes of biomembranes. Different probes optically indicate membrane properties such as the lipid phase, thickness, viscosity, and electrical potential. The detailed molecular mechanisms behind probe signals are not well understood, in part due to the lack of tools to determine probe position and orientation in the membrane. Optical measurements on aligned biomembranes and lipid bilayers provide some degree of orientational information based on anisotropy in absorption, fluorescence, or nonlinear optical properties. These methods typically find the polar tilt angle between the membrane normal and the long axis of the molecule. Here we show that solution-phase surface enhanced Raman scattering (SERS) spectra of lipid membranes on gold nanorods can be used to determine molecular orientation of molecules within the membrane. The voltage sensitive dye 4-(2-(6-(dibutylamino)-2-naphthalenyl)ethenyl)-1-(3-sulfopropyl)-hydroxide, known as di-4-ANEPPS, is studied. Through the analysis of several peaks in the SERS spectrum, the polar angle from the membrane normal is found to be 66°, and the roll angle around the long axis of the molecule to be 305° from the original orientation. This structural analysis method could help elucidate the meaning of fluorescent membrane probe signals, and how they are affected by different lipid compositions.
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Affiliation(s)
- Hannah J Hughes
- Department of Physics & Astronomy, Rice University, Houston, TX, United States of America
| | - Steven M E Demers
- Department of Physics & Astronomy, Rice University, Houston, TX, United States of America
| | - Aobo Zhang
- Department of Physics & Astronomy, Rice University, Houston, TX, United States of America
| | - Jason H Hafner
- Department of Physics & Astronomy, Rice University, Houston, TX, United States of America; Department of Chemistry, Rice University, Houston, TX, United States of America.
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