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Lepekhina TB, Nikolaev VV, Darvin ME, Zuhayri H, Snegerev MS, Lozhkomoev AS, Senkina EI, Kokhanenko AP, Lozovoy KA, Kistenev YV. Two-Photon-Excited FLIM of NAD(P)H and FAD-Metabolic Activity of Fibroblasts for the Diagnostics of Osteoimplant Survival. Int J Mol Sci 2024; 25:2257. [PMID: 38396933 PMCID: PMC10889693 DOI: 10.3390/ijms25042257] [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: 12/21/2023] [Revised: 02/04/2024] [Accepted: 02/11/2024] [Indexed: 02/25/2024] Open
Abstract
Bioinert materials such as the zirconium dioxide and aluminum oxide are widely used in surgery and dentistry due to the absence of cytotoxicity of the materials in relation to the surrounding cells of the body. However, little attention has been paid to the study of metabolic processes occurring at the implant-cell interface. The metabolic activity of mouse 3T3 fibroblasts incubated on yttrium-stabilized zirconium ceramics cured with aluminum oxide (ATZ) and stabilized zirconium ceramics (Y-TZP) was analyzed based on the ratio of the free/bound forms of cofactors NAD(P)H and FAD obtained using two-photon microscopy. The results show that fibroblasts incubated on ceramics demonstrate a shift towards the free form of NAD(P)H, which is observed during the glycolysis process, which, according to our assumptions, is related to the porosity of the surface of ceramic structures. Consequently, despite the high viability and good proliferation of fibroblasts assessed using an MTT test and a scanning electron microscope, the cells are in a state of hypoxia during incubation on ceramic structures. The FLIM results obtained in this work can be used as additional information for scientists who are interested in manufacturing osteoimplants.
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Affiliation(s)
- Tatiana B. Lepekhina
- Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, Russia; (T.B.L.); (V.V.N.); (H.Z.); (M.S.S.); (E.I.S.); (Y.V.K.)
| | - Viktor V. Nikolaev
- Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, Russia; (T.B.L.); (V.V.N.); (H.Z.); (M.S.S.); (E.I.S.); (Y.V.K.)
| | | | - Hala Zuhayri
- Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, Russia; (T.B.L.); (V.V.N.); (H.Z.); (M.S.S.); (E.I.S.); (Y.V.K.)
| | - Mikhail S. Snegerev
- Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, Russia; (T.B.L.); (V.V.N.); (H.Z.); (M.S.S.); (E.I.S.); (Y.V.K.)
| | - Aleksandr S. Lozhkomoev
- Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences (ISPMS SB RAS), 634021 Tomsk, Russia;
| | - Elena I. Senkina
- Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, Russia; (T.B.L.); (V.V.N.); (H.Z.); (M.S.S.); (E.I.S.); (Y.V.K.)
- Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences (ISPMS SB RAS), 634021 Tomsk, Russia;
| | - Andrey P. Kokhanenko
- Department of Quantum Electronics and Photonics, Faculty of Radiophysics, National Research Tomsk State University, Lenin Av. 36, 634050 Tomsk, Russia;
| | - Kirill A. Lozovoy
- Department of Quantum Electronics and Photonics, Faculty of Radiophysics, National Research Tomsk State University, Lenin Av. 36, 634050 Tomsk, Russia;
| | - Yury V. Kistenev
- Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University, Lenin Ave. 36, 634050 Tomsk, Russia; (T.B.L.); (V.V.N.); (H.Z.); (M.S.S.); (E.I.S.); (Y.V.K.)
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Bernardi M, Cardarelli F. Phasor identifier: A cloud-based analysis of phasor-FLIM data on Python notebooks. BIOPHYSICAL REPORTS 2023; 3:100135. [PMID: 38053971 PMCID: PMC10694583 DOI: 10.1016/j.bpr.2023.100135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Accepted: 11/03/2023] [Indexed: 12/07/2023]
Abstract
This paper introduces an innovative approach utilizing Google Colaboratory for the versatile analysis of phasor fluorescence lifetime imaging microscopy (FLIM) data collected from various samples (e.g., cuvette, cells, tissues) and in various input file formats. In fact, phasor-FLIM widespread adoption has been hampered by complex instrumentation and data analysis requirements. We mean to make advanced FLIM analysis more accessible to researchers through a cloud-based solution that 1) harnesses robust computational resources, 2) eliminates hardware limitations, and 3) supports both CPU and GPU processing. We envision a paradigm shift in FLIM data accessibility and potential, aligning with the evolving field of artificial intelligence-driven FLIM analysis. This approach simplifies FLIM data handling and opens doors for diverse applications, from studying cellular metabolism to investigating drug encapsulation, benefiting researchers across multiple domains. The comparative analysis of freely distributed FLIM tools highlights the unique advantages of this approach in terms of adaptability, scalability, and open-source nature.
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3
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Li H, Cao S, Chen J, Zhang S, Xu J, Knutson JR. Ultrafast fluorescence dynamics of NADH in aprotic solvents: Quasi-static self-quenching unmasked. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2022.114384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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4
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Torrado B, Dvornikov A, Gratton E. Method of transmission filters to measure emission spectra in strongly scattering media. BIOMEDICAL OPTICS EXPRESS 2021; 12:3760-3774. [PMID: 34457378 PMCID: PMC8367243 DOI: 10.1364/boe.422236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 04/20/2021] [Accepted: 05/20/2021] [Indexed: 06/13/2023]
Abstract
We describe a method based on a pair of transmission filters placed in the emission path of a microscope to resolve the emission wavelength of every point in an image. The method can be applied to any type of imaging device that provides the light in the wavelength transmission range of the filters. Unique characteristics of the filter approach are that the light does not need to be collimated and the wavelength response does not depend on the scattering of the sample or tissue. The pair of filters are used to produce the spectral phasor of the transmitted light, which is sufficient to perform spectral deconvolution over a broad wavelength range. The method is sensitive enough to distinguish free and protein-bound NADH and can be used in metabolic studies.
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Affiliation(s)
- Belén Torrado
- Laboratory for Fluorescence Dynamics, Biomedical Engineering Department, University of California at Irvine, California 92697, USA
| | - Alexander Dvornikov
- Laboratory for Fluorescence Dynamics, Biomedical Engineering Department, University of California at Irvine, California 92697, USA
| | - Enrico Gratton
- Laboratory for Fluorescence Dynamics, Biomedical Engineering Department, University of California at Irvine, California 92697, USA
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5
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Cao S, Li H, Liu Y, Wang M, Zhang M, Zhang S, Chen J, Xu J, Knutson JR, Brand L. Dehydrogenase Binding Sites Abolish the "Dark" Fraction of NADH: Implication for Metabolic Sensing via FLIM. J Phys Chem B 2020; 124:6721-6727. [PMID: 32660250 PMCID: PMC7477841 DOI: 10.1021/acs.jpcb.0c04835] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The fluorescence of dinucleotide NADH has been exploited for decades to determine the redox state of cells and tissues in vivo and in vitro. Particularly, nanosecond (ns) fluorescence lifetime imaging microscopy (FLIM) of NADH (in free vs bound forms) has recently offered a label-free readout of mitochondrial function and allowed the different "pools" of NADH to be distinguished in living cells. In this study, the ultrafast fluorescence dynamics of NADH-dehydrogenase (MDH/LDH) complexes have been investigated by using both a femtosecond (fs) upconversion spectrophotofluorometer and a picosecond (ps) time-correlated single photon counting (TCSPC) apparatus. With these enhanced time-resolved tools, a few-picosecond decay process with a signatory spectrum was indeed found for bound NADH, and it can best be ascribed to the solvent relaxation originating in "bulk water". However, it is quite unlike our previously discovered ultrafast "dark" component (∼26 ps) that is prominent in free NADH (Chemical Physics Letters 2019, 726, 18-21). For these two critical protein-bound NADH exemplars, the decay transients lack the ultrafast quenching that creates the "dark" subpopulation of free NADH. Therefore, we infer that the apparent ratio of free to bound NADH recovered by ordinary (>50 ps) FLIM methods may be low, since the "dark" molecule subpopulation (lifetime too short for conventional FLIM), which effectively hides about a quarter of free molecules, is not present in the dehydrogenase-bound state.
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Affiliation(s)
- Simin Cao
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Haoyang Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Yangyi Liu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Mengyu Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Mengjie Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Sanjun Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jinquan Chen
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jianhua Xu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jay R Knutson
- Laboratory for Advanced Microscopy and Biophotonics, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, United States
| | - Ludwig Brand
- Department of Biology, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
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Penjweini R, Roarke B, Alspaugh G, Gevorgyan A, Andreoni A, Pasut A, Sackett DL, Knutson JR. Single cell-based fluorescence lifetime imaging of intracellular oxygenation and metabolism. Redox Biol 2020; 34:101549. [PMID: 32403080 PMCID: PMC7217996 DOI: 10.1016/j.redox.2020.101549] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 04/15/2020] [Accepted: 04/20/2020] [Indexed: 12/02/2022] Open
Abstract
Oxidation-reduction chemistry is fundamental to the metabolism of all living organisms, and hence quantifying the principal redox players is important for a comprehensive understanding of cell metabolism in normal and pathological states. In mammalian cells, this is accomplished by measuring oxygen partial pressure (pO2) in parallel with free and enzyme-bound reduced nicotinamide adenine dinucleotide (phosphate) [H] (NAD(P)H) and flavin adenine dinucleotide (FAD, a proxy for NAD+). Previous optical methods for these measurements had accompanying problems of cytotoxicity, slow speed, population averaging, and inability to measure all redox parameters simultaneously. Herein we present a Förster resonance energy transfer (FRET)-based oxygen sensor, Myoglobin-mCherry, compatible with fluorescence lifetime imaging (FLIM)-based measurement of nicotinamide coenzyme state. This offers a contemporaneous reading of metabolic activity through real-time, non-invasive, cell-by-cell intracellular pO2 and coenzyme status monitoring in living cells. Additionally, this method reveals intracellular spatial heterogeneity and cell-to-cell variation in oxygenation and coenzyme states.
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Affiliation(s)
- Rozhin Penjweini
- Laboratory of Advanced Microscopy and Biophotonics, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Building 10, Room 5D14, Bethesda, MD, 20892-1412, USA
| | - Branden Roarke
- Laboratory of Advanced Microscopy and Biophotonics, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Building 10, Room 5D14, Bethesda, MD, 20892-1412, USA
| | - Greg Alspaugh
- Laboratory of Advanced Microscopy and Biophotonics, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Building 10, Room 5D14, Bethesda, MD, 20892-1412, USA
| | - Anahit Gevorgyan
- Laboratory of Advanced Microscopy and Biophotonics, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Building 10, Room 5D14, Bethesda, MD, 20892-1412, USA
| | - Alessio Andreoni
- Laboratory of Advanced Microscopy and Biophotonics, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Building 10, Room 5D14, Bethesda, MD, 20892-1412, USA; Laboratory of Optical Neurophysiology, Department of Biochemistry and Molecular Medicine, University of California Davis, Tupper Hall, Davis, CA, 95616, USA
| | - Alessandra Pasut
- Laboratory of Angiogenesis and Vascular Metabolism, Center for Cancer Biology, VIB, Leuven Cancer Institute, KU Leuven, Leuven, 3000, Belgium
| | - Dan L Sackett
- Cytoskeletal Dynamics Group, Division of Basic and Translational Biophysics, Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH), Building 9, Room 1E129, Bethesda, MD, 20892-0924, USA
| | - Jay R Knutson
- Laboratory of Advanced Microscopy and Biophotonics, National Heart, Lung, and Blood Institute (NHLBI), National Institutes of Health (NIH), Building 10, Room 5D14, Bethesda, MD, 20892-1412, USA.
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Ranjit S, Malacrida L, Stakic M, Gratton E. Determination of the metabolic index using the fluorescence lifetime of free and bound nicotinamide adenine dinucleotide using the phasor approach. JOURNAL OF BIOPHOTONICS 2019; 12:e201900156. [PMID: 31194290 PMCID: PMC6842045 DOI: 10.1002/jbio.201900156] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 06/09/2019] [Accepted: 06/12/2019] [Indexed: 05/05/2023]
Abstract
The fluorescence lifetime of nicotinamide adenine dinucleotide (NADH) is commonly used in conjunction with the phasor approach as a molecular biomarker to provide information on cellular metabolism of autofluorescence imaging of cells and tissue. However, in the phasor approach, the bound and free lifetime defining the phasor metabolic trajectory is a subject of debate. The fluorescence lifetime of NADH increases when bound to an enzyme, in contrast to the short multiexponential lifetime displayed by NADH in solution. The extent of fluorescence lifetime increase depends on the enzyme to which NADH is bound. With proper preparation of lactate dehydrogenase (LDH) using oxalic acid (OA) as an allosteric factor, bound NADH to LDH has a lifetime of 3.4 ns and is positioned on the universal semicircle of the phasor plot, inferring a monoexponential lifetime for this species. Surprisingly, measurements in the cellular environments with different metabolic states show a linear trajectory between free NADH at about 0.37 ns and bound NADH at 3.4 ns. These observations support that in a cellular environment, a 3.4 ns value could be used for bound NADH lifetime. The phasor analysis of many cell types shows a linear combination of fractional contributions of free and bound species NADH.
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Affiliation(s)
- Suman Ranjit
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, California
| | - Leonel Malacrida
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, California
- Departamento de Fisiopatología, Hospital de Clínicas, Universidad de la República, Montevideo, Uruguay
| | - Milka Stakic
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, California
| | - Enrico Gratton
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, California
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8
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Cao S, Zhou Z, Li H, Jia M, Liu Y, Wang M, Zhang M, Zhang S, Chen J, Xu J, Knutson JR. A fraction of NADH in solution is "dark": Implications for metabolic sensing via fluorescence lifetime. Chem Phys Lett 2019; 726:18-21. [PMID: 32921799 PMCID: PMC7486008 DOI: 10.1016/j.cplett.2019.04.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The metabolic cofactor and energy carrier NADH (nicotinamide adenine dinucleotide, reduced) has fluorescence yield and lifetime that depends strongly on conformation, a fact that has enabled metabolic monitoring of cells via FLIM (Fluorescence Lifetime Microscopy). Using femtosecond fluorescence upconversion, we show that this molecule in solution participates in ultrafast self-quenching along with both bulk solvent relaxation and spectral relaxation on 1.4 and 26 ps timescales. This, in effect, means up to a third of NADH is effectively "dark" for FLIM in the 400-500 nm observation window commonly employed. Methods to compensate for, avoid or measure dark species corrections are outlined.
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Affiliation(s)
- Simin Cao
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Zhongneng Zhou
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Haoyang Li
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Menghui Jia
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Yangyi Liu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Mengyu Wang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Mengjie Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Sanjun Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jinquan Chen
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jianhua Xu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
| | - Jay R. Knutson
- Laboratory for Advanced Microscopy and Biophotonics, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, United States
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9
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Kolenc OI, Quinn KP. Evaluating Cell Metabolism Through Autofluorescence Imaging of NAD(P)H and FAD. Antioxid Redox Signal 2019; 30:875-889. [PMID: 29268621 PMCID: PMC6352511 DOI: 10.1089/ars.2017.7451] [Citation(s) in RCA: 151] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
SIGNIFICANCE Optical imaging using the endogenous fluorescence of metabolic cofactors has enabled nondestructive examination of dynamic changes in cell and tissue function both in vitro and in vivo. Quantifying NAD(P)H and FAD fluorescence through an optical redox ratio and fluorescence lifetime imaging (FLIM) provides sensitivity to the relative balance between oxidative phosphorylation and glucose catabolism. Since its introduction decades ago, the use of NAD(P)H imaging has expanded to include applications involving almost every major tissue type and a variety of pathologies. Recent Advances: This review focuses on the use of two-photon excited fluorescence and NAD(P)H fluorescence lifetime techniques in cancer, neuroscience, tissue engineering, and other biomedical applications over the last 5 years. In a variety of cancer models, NAD(P)H fluorescence intensity and lifetime measurements demonstrate a sensitivity to the Warburg effect, suggesting potential for early detection or high-throughput drug screening. The sensitivity to the biosynthetic demands of stem cell differentiation and tissue repair processes indicates the range of applications for this imaging technology may be broad. CRITICAL ISSUES As the number of applications for these fluorescence imaging techniques expand, identifying and characterizing additional intrinsic fluorophores and chromophores present in vivo will be vital to accurately measure and interpret metabolic outcomes. Understanding the full capabilities and limitations of FLIM will also be key to future advances. FUTURE DIRECTIONS Future work is needed to evaluate whether a combination of different biochemical and structural outcomes using these imaging techniques can provide complementary information regarding the utilization of specific metabolic pathways.
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Affiliation(s)
- Olivia I Kolenc
- Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas
| | - Kyle P Quinn
- Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas
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Molano-Arevalo JC, Gonzalez W, Jeanne Dit Fouque K, Miksovska J, Maitre P, Fernandez-Lima F. Insights from ion mobility-mass spectrometry, infrared spectroscopy, and molecular dynamics simulations on nicotinamide adenine dinucleotide structural dynamics: NAD +vs. NADH. Phys Chem Chem Phys 2018; 20:7043-7052. [PMID: 29473073 DOI: 10.1039/c7cp05602h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Nicotinamide adenine dinucleotide (NAD) is found in all living cells where the oxidized (NAD+) and reduced (NADH) forms play important roles in many enzymatic reactions. However, little is known about NAD+ and NADH conformational changes and kinetics as a function of the cell environment. In the present work, an analytical workflow is utilized to study NAD+ and NADH dynamics as a function of the organic content in solution using fluorescence lifetime spectroscopy and in the gas-phase using trapped ion mobility spectrometry coupled to mass spectrometry (TIMS-MS) and infrared multiple photon dissociation (IRMPD) spectroscopy. NAD solution time decay studies showed a two-component distribution, assigned to changes from a "close" to "open" conformation with the increase of the organic content. NAD gas-phase studies using nESI-TIMS-MS displayed two ion mobility bands for NAD+ protonated and sodiated species, while four and two ion mobility bands were observed for NADH protonated and sodiated species, respectively. Changes in the mobility profiles were observed for NADH as a function of the starting solution conditions and the time after desolvation, while NAD+ profiles showed no dependence. IRMPD spectroscopy of NAD+ and NADH protonated species in the 800-1800 and 3200-3700 cm-1 spectral regions showed common and signature bands between the NAD forms. Candidate structures were proposed for NAD+ and NADH kinetically trapped intermediates of the protonated and sodiated species, based on their collision cross sections and IR profiles. Results showed that NAD+ and NADH species exist in open, stack, and closed conformations and that the driving force for conformational dynamics is hydrogen bonding of the N-H-O and O-H-O forms with ribose rings.
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11
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Mah EJ, Lefebvre AEYT, McGahey GE, Yee AF, Digman MA. Collagen density modulates triple-negative breast cancer cell metabolism through adhesion-mediated contractility. Sci Rep 2018; 8:17094. [PMID: 30459440 DOI: 10.2139/ssrn.3188427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 10/30/2018] [Indexed: 05/21/2023] Open
Abstract
Extracellular matrix (ECM) mechanical properties upregulate cancer invasion, cell contractility, and focal adhesion formation. Alteration in energy metabolism is a known characteristic of cancer cells (i.e., Warburg effect) and modulates cell invasion. There is little evidence to show if collagen density can alter cancer cell metabolism. We investigated changes in energy metabolism due to collagen density in five breast cell lines by measuring the fluorescence lifetime of NADH. We found that only triple-negative breast cancer cells, MDA-MB231 and MDA-MB468 cells, had an increased population of bound NADH, indicating an oxidative phosphorylation (OXPHOS) signature, as collagen density decreased. When inhibiting ROCK and cell contractility, MDA-MB231 cells on glass shifted from glycolysis (GLY) to OXPHOS, confirming the intricate relationship between mechanosensing and metabolism. MCF10A cells showed less significant changes in metabolism, shifting towards GLY as collagen density decreased. The MCF-7 and T-47D, less invasive breast cancer cells, compared to the MDA-MB231 and MDA-MB468 cells, showed no changes regardless of substrate. In addition, OXPHOS or GLY inhibitors in MDA-MB231 cells showed dramatic shifts from OXPHOS to GLY or vice versa. These results provide an important link between cellular metabolism, contractility, and collagen density in human breast cancer.
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Affiliation(s)
- Emma J Mah
- Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California, USA
- Laboratory for Fluorescence Dynamics, University of California, Irvine, Irvine, USA
| | - Austin E Y T Lefebvre
- Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA
- Laboratory for Fluorescence Dynamics, University of California, Irvine, Irvine, USA
| | - Gabrielle E McGahey
- Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA
- Laboratory for Fluorescence Dynamics, University of California, Irvine, Irvine, USA
| | - Albert F Yee
- Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California, USA
- Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA
| | - Michelle A Digman
- Department of Chemical Engineering and Materials Science, University of California, Irvine, Irvine, California, USA.
- Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA.
- Laboratory for Fluorescence Dynamics, University of California, Irvine, Irvine, USA.
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12
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Collagen density modulates triple-negative breast cancer cell metabolism through adhesion-mediated contractility. Sci Rep 2018; 8:17094. [PMID: 30459440 PMCID: PMC6244401 DOI: 10.1038/s41598-018-35381-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 10/30/2018] [Indexed: 01/01/2023] Open
Abstract
Extracellular matrix (ECM) mechanical properties upregulate cancer invasion, cell contractility, and focal adhesion formation. Alteration in energy metabolism is a known characteristic of cancer cells (i.e., Warburg effect) and modulates cell invasion. There is little evidence to show if collagen density can alter cancer cell metabolism. We investigated changes in energy metabolism due to collagen density in five breast cell lines by measuring the fluorescence lifetime of NADH. We found that only triple-negative breast cancer cells, MDA-MB231 and MDA-MB468 cells, had an increased population of bound NADH, indicating an oxidative phosphorylation (OXPHOS) signature, as collagen density decreased. When inhibiting ROCK and cell contractility, MDA-MB231 cells on glass shifted from glycolysis (GLY) to OXPHOS, confirming the intricate relationship between mechanosensing and metabolism. MCF10A cells showed less significant changes in metabolism, shifting towards GLY as collagen density decreased. The MCF-7 and T-47D, less invasive breast cancer cells, compared to the MDA-MB231 and MDA-MB468 cells, showed no changes regardless of substrate. In addition, OXPHOS or GLY inhibitors in MDA-MB231 cells showed dramatic shifts from OXPHOS to GLY or vice versa. These results provide an important link between cellular metabolism, contractility, and collagen density in human breast cancer.
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13
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Lagarto JL, Dyer BT, Talbot CB, Peters NS, French PMW, Lyon AR, Dunsby C. Characterization of NAD(P)H and FAD autofluorescence signatures in a Langendorff isolated-perfused rat heart model. BIOMEDICAL OPTICS EXPRESS 2018; 9:4961-4978. [PMID: 30319914 PMCID: PMC6179415 DOI: 10.1364/boe.9.004961] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/10/2018] [Accepted: 08/11/2018] [Indexed: 05/22/2023]
Abstract
Autofluorescence spectroscopy is a promising label-free approach to characterize biological samples with demonstrated potential to report structural and biochemical alterations in tissues in a number of clinical applications. We report a characterization of the ex vivo autofluorescence fingerprint of cardiac tissue, exploiting a Langendorff-perfused isolated rat heart model to induce physiological insults to the heart, with a view to understanding how metabolic alterations affect the autofluorescence signals. Changes in the autofluorescence intensity and lifetime signatures associated with reduced nicotinamide adenine dinucleotide (phosphate) (NAD(P)H) and flavin adenine dinucleotide (FAD) were characterized during oxygen- or glucose-depletion protocols. Results suggest that both NAD(P)H and FAD autofluorescence intensity and lifetime parameters are sensitive to changes in the metabolic state of the heart owing to oxygen deprivation. We also observed changes in NAD(P)H fluorescence intensity and FAD lifetime parameter on reperfusion of oxygen, which might provide information on reperfusion injury, and permanent tissue damage or changes to the tissue during recovery from oxygen deprivation. We found that changes in the autofluorescence signature following glucose-depletion are, in general, less pronounced, and most clearly visible in NAD(P)H related parameters. Overall, the results reported in this investigation can serve as baseline for future investigations of cardiac tissue involving autofluorescence measurements.
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Affiliation(s)
- João L Lagarto
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK
- Authors contributed equally to this work
| | - Benjamin T Dyer
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
- Authors contributed equally to this work
| | - Clifford B Talbot
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK
| | - Nicholas S Peters
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
| | - Paul M W French
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK
| | - Alexander R Lyon
- National Heart and Lung Institute, Imperial College London, Du Cane Road, London W12 0NN, UK
- Authors contributed equally to this work
| | - Chris Dunsby
- Photonics Group, Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK
- Centre for Pathology, Imperial College London, Du Cane Road, London, W12 0NN, UK
- Authors contributed equally to this work
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15
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Pouli D, Tozzi L, Alonzo CA, Liu Z, Kaplan DL, Balduini A, Georgakoudi I. Label free monitoring of megakaryocytic development and proplatelet formation in vitro. BIOMEDICAL OPTICS EXPRESS 2017; 8:4742-4755. [PMID: 29082099 PMCID: PMC5654814 DOI: 10.1364/boe.8.004742] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 09/01/2017] [Accepted: 09/05/2017] [Indexed: 06/07/2023]
Abstract
Megakaryopoiesis and platelet production are complex biological processes that require tight regulation of successive lineage commitment steps and are ultimately responsible for maintaining and renewing the pool of circulating platelets in the blood. Despite major advancements in the understanding of megakaryocytic biology, the detailed mechanisms driving megakaryocytic differentiation have yet to be elucidated. Here we show that automated image analysis algorithms applied to two-photon excited fluorescence (TPEF) images can non-invasively monitor structural and metabolic megakaryocyte behavior changes occurring during differentiation and platelet formation in vitro. Our results demonstrate that high-contrast, label-free two photon imaging holds great potential in studying the underlying physiological processes controlling the intricate process of platelet production.
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Affiliation(s)
- Dimitra Pouli
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
- These authors contributed equally to this work
| | - Lorenzo Tozzi
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
- Biotechnology Research Laboratories, IRCCS San Matteo Foundation, Pavia, Italy
- These authors contributed equally to this work
| | - Carlo A. Alonzo
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
| | - Zhiyi Liu
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
| | - David L. Kaplan
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
| | - Alessandra Balduini
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
- Biotechnology Research Laboratories, IRCCS San Matteo Foundation, Pavia, Italy
| | - Irene Georgakoudi
- Department of Biomedical Engineering, Tufts University, 4 Colby St., 02155 Medford MA, USA
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16
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Alonzo CA, Karaliota S, Pouli D, Liu Z, Karalis KP, Georgakoudi I. Two-photon excited fluorescence of intrinsic fluorophores enables label-free assessment of adipose tissue function. Sci Rep 2016; 6:31012. [PMID: 27491409 PMCID: PMC4974509 DOI: 10.1038/srep31012] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 07/11/2016] [Indexed: 01/24/2023] Open
Abstract
Current methods for evaluating adipose tissue function are destructive or have low spatial resolution. These limit our ability to assess dynamic changes and heterogeneous responses that occur in healthy or diseased subjects, or during treatment. Here, we demonstrate that intrinsic two-photon excited fluorescence enables functional imaging of adipocyte metabolism with subcellular resolution. Steady-state and time-resolved fluorescence from intracellular metabolic co-factors and lipid droplets can distinguish the functional states of excised white, brown, and cold-induced beige fat. Similar optical changes are identified when white and brown fat are assessed in vivo. Therefore, these studies establish the potential of non-invasive, high resolution, endogenous contrast, two-photon imaging to identify distinct adipose tissue types, monitor their functional state, and characterize heterogeneity of induced responses.
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Affiliation(s)
- Carlo Amadeo Alonzo
- Department of Biomedical Engineering, Tufts University 4 Colby Street, Medford, MA 02155, USA
| | | | - Dimitra Pouli
- Department of Biomedical Engineering, Tufts University 4 Colby Street, Medford, MA 02155, USA
| | - Zhiyi Liu
- Department of Biomedical Engineering, Tufts University 4 Colby Street, Medford, MA 02155, USA
| | - Katia P Karalis
- Biomedical Research Foundation, Academy of Athens, Athens, Greece.,Endocrine Division, Children's Hospital, Boston, MA 02115, USA
| | - Irene Georgakoudi
- Department of Biomedical Engineering, Tufts University 4 Colby Street, Medford, MA 02155, USA
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17
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Ma N, Digman MA, Malacrida L, Gratton E. Measurements of absolute concentrations of NADH in cells using the phasor FLIM method. BIOMEDICAL OPTICS EXPRESS 2016; 7:2441-52. [PMID: 27446681 PMCID: PMC4948605 DOI: 10.1364/boe.7.002441] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 05/19/2016] [Accepted: 05/19/2016] [Indexed: 05/18/2023]
Abstract
We propose a graphical method using the phasor representation of the fluorescence decay to derive the absolute concentration of NADH in cells. The method requires the measurement of a solution of NADH at a known concentration. The phasor representation of the fluorescence decay accounts for the differences in quantum yield of the free and bound form of NADH, pixel by pixel of an image. The concentration of NADH in every pixel in a cell is obtained after adding to each pixel in the phasor plot a given amount of unmodulated light which causes a shift of the phasor towards the origin by an amount that depends on the intensity at the pixel and the fluorescence lifetime at the pixel. The absolute concentration of NADH is obtained by comparison of the shift obtained at each pixel of an image with the shift of the calibrated solution.
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18
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Quantification of the Metabolic State in Cell-Model of Parkinson's Disease by Fluorescence Lifetime Imaging Microscopy. Sci Rep 2016; 6:19145. [PMID: 26758390 PMCID: PMC4725947 DOI: 10.1038/srep19145] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 12/07/2015] [Indexed: 12/17/2022] Open
Abstract
Intracellular endogenous fluorescent co-enzymes, reduced nicotinamide adenine dinucleotide (NADH) and flavin adenine dinucleotide (FAD), play a pivotal role in cellular metabolism; quantitative assessment of their presence in living cells can be exploited to monitor cellular energetics in Parkinson's disease (PD), a neurodegenerative disorder. Here, we applied two-photon fluorescence lifetime imaging microscopy (2P-FLIM) to noninvasively measure the fluorescence lifetime components of NADH and FAD, and their relative contributions in MPP(+) (1-methyl-4-phenylpyridinium) treated neuronal cells, derived from PC12 cells treated with nerve growth factor (NGF), to mimic PD conditions. A systematic FLIM data analysis showed a statistically significant (p < 0.001) decrease in the fluorescence lifetime of both free and protein-bound NADH, as well as free and protein-bound FAD in MPP(+) treated cells. On the relative contributions of the free and protein-bound NADH and FAD to the life time, however, both the free NADH contribution and the corresponding protein-bound FAD contribution increase significantly (p < 0.001) in MPP(+) treated cells, compared to control cells. These results, which indicate a shift in energy production in the MPP(+) treated cells from oxidative phosphorylation towards anaerobic glycolysis, can potentially be used as cellular metabolic metrics to assess the condition of PD at the cellular level.
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Plotegher N, Stringari C, Jahid S, Veronesi M, Girotto S, Gratton E, Bubacco L. NADH fluorescence lifetime is an endogenous reporter of α-synuclein aggregation in live cells. FASEB J 2015; 29:2484-94. [PMID: 25713058 DOI: 10.1096/fj.14-260281] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 02/06/2015] [Indexed: 12/22/2022]
Abstract
α-Synuclein (aS) aggregation has been amply investigated for its involvement in Parkinson's disease because its amyloid fibrils are the main constituent of Lewy bodies, one of the hallmarks of the disease. aS aggregation was studied here in vitro and in cellular models to correlate aggregation products with toxicity mechanisms. Independent results published elsewhere suggested that aS overexpression and/or aggregation may impair cellular metabolism and cause mitochondrial damage. In this context, we report the characterization of changes in NADH fluorescence properties in vitro and in human embryonic kidney 293 cells upon aS aggregation. The application of the phasor approach to study NADH fluorescence lifetime and emission allowed us to identify changes that correlate with aS aggregation. In particular, the fraction of bound NADH, characterized by longer lifetimes in comparison to free NADH, is increased, and the maximum of the NADH emission is shifted toward shorter wavelengths in the presence of aggregating aS both in vitro and in cells. These data suggest that NADH binds to aggregated aS. NMR experiments in vitro substantiate such binding, which occurs during aggregation. NADH fluorescence is thus useful to detect aS aggregation and by extension the associated oxidative stress.
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Affiliation(s)
- Nicoletta Plotegher
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Chiara Stringari
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Sohail Jahid
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Marina Veronesi
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Stefania Girotto
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Enrico Gratton
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
| | - Luigi Bubacco
- *Department of Biology, University of Padua, Padua, Italy; Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, Irvine, California, USA; and Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genoa, Italy
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20
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Chorvatova A, Elzwiei F, Mateasik A, Chorvat D. Effect of ouabain on metabolic oxidative state in living cardiomyocytes evaluated by time-resolved spectroscopy of endogenous NAD(P)H fluorescence. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:101505. [PMID: 23223981 DOI: 10.1117/1.jbo.17.10.101505] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Time-resolved spectrometry of endogenous nicotinamide dinucleotide phosphate [NAD(P)H] fluorescence is a useful method to evaluate metabolic oxidative state in living cells. Ouabain is a well-known pharmaceutical drug used in the treatment of cardiovascular disease, the effects of which on myocardial metabolism were recently demonstrated. Mechanisms implicated in these actions are still poorly understood. We investigate the effect of ouabain on the metabolic oxidative state of living cardiac cells identified by time-resolved fluorescence spectroscopy of mitochondrial NAD(P)H. Spectral unmixing is used to resolve individual NAD(P)H fluorescence components. Ouabain decreased the integral intensity of NAD(P)H fluorescence, leading to a reduced component amplitudes ratio corresponding to a change in metabolic state. We also noted that lactate/pyruvate, affecting the cytosolic NADH gradient, increased the effect of ouabain on the component amplitudes ratio. Cell oxidation levels, evaluated as the percentage of oxidized NAD(P)H, decreased exponentially with rising concentrations of the cardiac glycoside. Ouabain also stimulated the mitochondrial NADH production. Our study sheds a new light on the role that ouabain plays in the regulation of metabolic state, and presents perspective on a noninvasive, pharmaceutical approach for testing the effect of drugs on the mitochondrial metabolism by means of time-resolved fluorescence spectroscopy in living cells.
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Affiliation(s)
- Alzbeta Chorvatova
- Department of Biophotonics, International Laser Center, 84104 Bratislava, Slovakia.
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21
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Butte PV, Mamelak AN, Nuno M, Bannykh SI, Black KL, Marcu L. Fluorescence lifetime spectroscopy for guided therapy of brain tumors. Neuroimage 2011; 54 Suppl 1:S125-35. [PMID: 21055475 PMCID: PMC3335732 DOI: 10.1016/j.neuroimage.2010.11.001] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2010] [Revised: 10/27/2010] [Accepted: 11/01/2010] [Indexed: 11/30/2022] Open
Abstract
This study evaluates the potential of time-resolved laser induced fluorescence spectroscopy (TR-LIFS) as intra-operative tool for the delineation of brain tumor from normal brain. Forty two patients undergoing glioma (WHO grade I-IV) surgery were enrolled in this study. A TR-LIFS prototype apparatus (gated detection, fast digitizer) was used to induce in-vivo fluorescence using a pulsed N2 laser (337 nm excitation, 0.7 ns pulse width) and to record the time-resolved spectrum (360-550 nm range, 10 nm interval). The sites of TR-LIFS measurement were validated by conventional histopathology (H&E staining). Parameters derived from the TR-LIFS data including intensity values and time-resolved intensity decay features (average fluorescence lifetime and Laguerre coefficients values) were used for tissue characterization and classification. 71 areas of tumor and normal brain were analyzed. Several parameters allowed for the differentiation of distinct tissue types. For example, normal cortex (N=35) and normal white matter (N=12) exhibit a longer-lasting fluorescence emission at 390 nm (τ390=2.12±0.10 ns) when compared with 460 nm (τ460=1.16±0.08 ns). High grade glioma (grades III and IV) samples (N=17) demonstrate emission peaks at 460 nm, with large variation at 390 nm while low grade glioma (I and II) samples (N=7) demonstrated a peak fluorescence emission at 460 nm. A linear discriminant algorithm allowed for the classification of low-grade gliomas with 100% sensitivity and 98% specificity. High-grade glioma demonstrated a high degree of heterogeneity thus reducing the discrimination accuracy of these tumors to 47% sensitivity and 94% specificity. Current findings demonstrate that TR-LIFS holds the potential to diagnose brain tumors intra-operatively and to provide a valuable tool for aiding the neurosurgeon-neuropathologist team in to rapidly distinguish between tumor and normal brain during surgery.
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Affiliation(s)
- Pramod V. Butte
- Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA – 90048
| | - Adam N. Mamelak
- Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA – 90048
| | - Miriam Nuno
- Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA – 90048
| | - Serguei I. Bannykh
- Department of Pathology, Cedars-Sinai Medical Center, Los Angeles, CA – 90048
| | - Keith L. Black
- Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA – 90048
| | - Laura Marcu
- Biomedical Engineering, University of California, Davis, CA – 95616
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22
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Butte PV, Fang Q, Jo JA, Yong WH, Pikul BK, Black KL, Marcu L. Intraoperative delineation of primary brain tumors using time-resolved fluorescence spectroscopy. JOURNAL OF BIOMEDICAL OPTICS 2010; 15:027008. [PMID: 20459282 PMCID: PMC4171753 DOI: 10.1117/1.3374049] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 01/18/2010] [Accepted: 02/09/2010] [Indexed: 05/20/2023]
Abstract
The goal of this study is to determine the potential of time-resolved laser-induced fluorescence spectroscopy (TR-LIFS) as an adjunctive tool for delineation of brain tumor from surrounding normal tissue in order to assist the neurosurgeon in near-complete tumor excision. A time-domain TR-LIFS prototype apparatus (gated photomultiplier detection, fast digitizer) was used for recording tissue autofluorescence in normal cortex (NC), normal white matter (NWM), and various grades of gliomas intraoperatively. Tissue fluorescence was induced with a pulsed nitrogen laser (337 nm, 700 ps), and the intensity decay profiles were recorded in the 360- to 550-nm spectral range (10-nm interval). Histopathological analysis (hematoxylin & eosin) of the biopsy samples taken from the site of TR-LIFS measurements was used for validation of spectroscopic results. Preliminary results on 17 patients demonstrate that normal cortex (N=16) and normal white matter (N=3) show two peaks of fluorescence emission at 390 nm (lifetime=1.8+/-0.3 ns) and 460 nm (lifetime=0.8+/-0.1 ns). The 390-nm emission peak is absent in low-grade glioma (N=5; lifetime=1.1 ns) and reduced in high-grade glioma (N=9; lifetime=1.7+/-0.4 ns). The emission characteristics at 460 nm in all tissues correlated with the nicotinamide adenine dinucleotide fluorescence (peak: 440 to 460 nm; lifetime: 0.8 to 1.0 ns). These findings demonstrate the potential of using TR-LIFS as a tool for enhanced delineation of brain tumors during surgery. In addition, this study evaluates similarities and differences between TR-LIFS signatures of brain tumors obtained in vivo and those previously reported in ex vivo brain tumor specimens.
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Affiliation(s)
- Pramod V Butte
- Cedars-Sinai Medical Center, Department of Neurosurgery, 8631 West 3rd Street, Suite 800E, Los Angeles, California 90048, USA
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Selective detection of NADPH oxidase in polymorphonuclear cells by means of NAD(P)H-based fluorescence lifetime imaging. JOURNAL OF BIOPHYSICS 2008; 2008:602639. [PMID: 20107577 PMCID: PMC2809359 DOI: 10.1155/2008/602639] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2008] [Accepted: 09/02/2008] [Indexed: 11/18/2022]
Abstract
NADPH oxidase (NOX2) is a multisubunit membrane-bound enzyme complex that, upon assembly in activated cells,
catalyses the reduction of free oxygen to its superoxide anion, which further leads to reactive oxygen species (ROS) that are
toxic to invading pathogens, for example, the fungus Aspergillus fumigatus. Polymorphonuclear cells (PMNs) employ both
nonoxidative and oxidative mechanisms to clear this fungus from the lung. The oxidative mechanisms mainly depend on the
proper assembly and function of NOX2. We identified for the first time the NAD(P)H-dependent enzymes involved in such
oxidative mechanisms by means of biexponential NAD(P)H-fluorescence lifetime imaging (FLIM). A specific fluorescence
lifetime of 3670±140 picoseconds as compared to 1870 picoseconds for NAD(P)H bound to mitochondrial enzymes could be
associated with NADPH bound to oxidative enzymes in activated PMNs. Due to its predominance in PMNs and due to the
use of selective activators and inhibitors, we strongly believe that this specific lifetime mainly originates from NOX2. Our
experiments also revealed the high site specificity of the NOX2 assembly and, thus, of the ROS production as well as the
dynamic nature of these phenomena. On the example of NADPH oxidase, we demonstrate the potential of NAD(P)H-based
FLIM in selectively investigating enzymes during their cellular function.
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24
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Eftink MR. Fluorescence techniques for studying protein structure. METHODS OF BIOCHEMICAL ANALYSIS 2006; 35:127-205. [PMID: 2002770 DOI: 10.1002/9780470110560.ch3] [Citation(s) in RCA: 230] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- M R Eftink
- Department of Chemistry, University of Mississippi
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25
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Evans ND, Gnudi L, Rolinski OJ, Birch DJS, Pickup JC. Glucose-dependent changes in NAD(P)H-related fluorescence lifetime of adipocytes and fibroblasts in vitro: potential for non-invasive glucose sensing in diabetes mellitus. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2005; 80:122-9. [PMID: 15908228 DOI: 10.1016/j.jphotobiol.2005.04.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2005] [Revised: 04/01/2005] [Accepted: 04/02/2005] [Indexed: 11/20/2022]
Abstract
The aim of this study was to test the hypothesis that glucose can be monitored non-invasively by measuring NAD(P)H-related fluorescence lifetime of cells in an in vitro cell culture model. Autofluorescence decay functions were measured in 3T3-L1 adipocytes by time-correlated single-photon counting (excitation 370nm, emission 420-480nm). Free NADH had a two-exponential decay but cell autofluorescence fitted best to a three-exponential decay. Addition of 30mM glucose caused a 29% increase in autofluorescence intensity, a significantly shortened mean lifetime (from 7.23 to 6.73ns), and an increase in the relative amplitude and fractional intensity of the short-lifetime component at the expense of the two longer-lifetime components. Similar effects were seen with rotenone, an agent that maximizes mitochondrial NADH. 3T3-L1 fibroblasts stained with the fluorescent mitochondrial marker, rhodamine 123 showed a 16% quenching of fluorescence intensity when exposed to 30mM glucose, and an increase in the relative amplitude and fractional intensity of the short lifetime at the expense of the longer lifetime component. We conclude that, though the effect size is relatively small, glucose can be measured non-invasively in cells by monitoring changes in the lifetimes of cell autofluorescence or of a dye marker of mitochondrial metabolism. Further investigation and development of fluorescence intensity and lifetime sensing is therefore indicated for possible non-invasive metabolic monitoring in human diabetes.
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Affiliation(s)
- N D Evans
- Department of Chemical Pathology, Guy's, King's and St. Thomas's School of Medicine, King's College, London SE1 9RT, UK
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26
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Fisher WG, Piston DW, Wachter EA. Phase sensitive demodulation in multiphoton microscopy. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2002; 8:191-202. [PMID: 12533235 DOI: 10.1017/s1431927602020147] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Multiphoton laser scanning microscopy offers advantages in depth of penetration into intact samples over other optical sectioning techniques. To achieve these advantages it is necessary to detect the emitted light without spatial filtering. In this nondescanned (nonconfocal) approach, ambient room light can easily contaminate the signal, forcing experiments to be performed in absolute darkness. For multiphoton microscope systems employing mode-locked lasers, signal processing can be used to reduce such problems by taking advantage of the pulsed characteristics of such lasers. Specifically, by recovering fluorescence generated at the mode-locked frequency, interference from stray light and other ambient noise sources can be significantly reduced. This technology can be adapted to existing microscopes by inserting demodulation circuitry between the detector and data collection system. The improvement in signal-to-noise ratio afforded by this approach yields a more robust microscope system and opens the possibility of moving multiphoton microscopy from the research lab to more demanding settings, such as the clinic.
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Affiliation(s)
- Walt G Fisher
- Photogen, Inc., 7327 Oak Ridge Highway, Knoxville, TN 37931, USA
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27
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Combs CA, Balaban RS. Direct imaging of dehydrogenase activity within living cells using enzyme-dependent fluorescence recovery after photobleaching (ED-FRAP). Biophys J 2001; 80:2018-28. [PMID: 11259315 PMCID: PMC1301391 DOI: 10.1016/s0006-3495(01)76172-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Reduced nicotine adenine dinucleotide (NADH) is a key metabolite involved in cellular energy conversion and many redox reactions. We describe the use of confocal microscopy in conjunction with enzyme-dependent fluorescence recovery after photobleaching (ED-FRAP) of NADH as a topological assay of NADH generation capacity within living cardiac myocytes. Quantitative validation of this approach was performed using a dehydrogenase system, in vitro. In intact cells the NADH ED-FRAP was sensitive to temperature (Q(10) of 2.5) and to dehydrogenase activation by dichloroacetate or cAMP (twofold increase for each). In addition, NADH ED-FRAP was correlated with flavin adenine dinucleotide (FAD(+)) fluorescence. These data, coupled with the cellular patterns of NADH ED-FRAP changes with dehydrogenase stimulation, suggest that NADH ED-FRAP is localized to the mitochondria. These results suggest that ED-FRAP enables measurement of regional dynamics of mitochondrial NADH production in intact cells, thus providing information regarding region-specific intracellular redox reactions and energy metabolism.
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Affiliation(s)
- C A Combs
- Laboratory of Cardiac Energetics, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1061, USA.
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28
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Shaw S, Geyer R, Alter GM. Dissociation of mitochondrial malate dehydrogenase into active soluble subunits. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1478:248-56. [PMID: 10825536 DOI: 10.1016/s0167-4838(00)00033-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Gel exclusion chromatographic studies demonstrate that cytosolic and mitochondrial malate dehydrogenases (cMDH and mMDH) dissociate into subunits in the presence of 0.1% of the non-ionic detergent Triton X-100 (TX-100). The presence of cofactor and catalytically competent cofactor-substrate pairs does not protect mMDH against this dissociation. In contrast, cMDH dimers resist dissociation in the presence of either addition. Since steady state kinetic studies indicate both enzymes are fully active in the presence of 0.1% TX-100, we conclude that quaternary structure is not a kinetically important feature of mMDH structure and cooperativity does not account for mMDH kinetic anomalies. In contrast, cooperativity is a reasonable explanation for cMDH kinetic properties even in the presence of 0.1% TX-100, since this enzyme's subunits associate in the presence of active site ligands. The existence of fully active mMDH subunits raises the possibility that this species rather than the dimer may be a constituent of proposed multi-enzyme complexes of the mitochondrion. Preliminary chromatographic experiments involving gently disrupted mitochondria have found MDH activity in differently sized complexes, all with molecular weights larger than the mMDH dimer but smaller than complexes anticipated for multi-enzyme complexes involving other enzymes and the mMDH dimer.
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Affiliation(s)
- S Shaw
- Electronic Data Systems, Dayton, OH 45439, USA
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Atherton SJ, Lambert C, Schultz J, Williams N, Zigman S. Fluorescence Studies of Lens Epithelial Cells and Their Constituents. Photochem Photobiol 1999. [DOI: 10.1111/j.1751-1097.1999.tb08289.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Jameson DM, Seifried SE. Quantification of protein-protein interactions using fluorescence polarization. Methods 1999; 19:222-33. [PMID: 10527728 DOI: 10.1006/meth.1999.0853] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Quantitative determinations of the dissociation constants of biomolecular interactions, in particular protein-protein interactions, are essential for a detailed understanding of the molecular basis of their specificities. Fluorescence spectroscopy is particularly well suited for such studies. This article highlights the theoretical and practical aspects of fluorescence polarization and its application to the study of protein-protein interactions. Consideration is given to the nature of the different types of fluorescence probes available and the probe characteristics appropriate for the system under investigation. Several examples from the literature are discussed that illustrate different practical aspects of the technique applied to diverse systems.
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Affiliation(s)
- D M Jameson
- Department of Genetics and Molecular Biology, University of Hawaii, 1960 East-West Road, Honolulu, Hawaii 96822, USA.
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Sánchez SA, Hazlett TL, Brunet JE, Jameson DM. Aggregation states of mitochondrial malate dehydrogenase. Protein Sci 1998; 7:2184-9. [PMID: 9792106 PMCID: PMC2143840 DOI: 10.1002/pro.5560071016] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The oligomeric state of fluorescein-labeled mitochondrial malate dehydrogenase (L-malate NAD+ oxidoreductase; mMDH; EC 1.1.1.37), as a function of protein concentration, has been examined using steady-state and dynamic polarization methodologies. A "global" rotational relaxation time of 103 +/- 7 ns was found for micromolar concentrations of mMDH-fluorescein, which is consistent with the reported size and shape of mMDH. Dilution of the mMDH-fluorescein conjugates, prepared using a phosphate buffer protocol, to nanomolar concentrations had no significant effect on the rotational relaxation time of the adduct, indicating that the dimer-monomer dissociation constant for mMDH is below 10(-9) M. In contrast to reports in the literature suggesting a pH-dependent dissociation of mMDH, the oligomeric state of this mMDH-fluorescein preparation remained unchanged between pH 5.0 and 8.0. Application of hydrostatic pressure up to 2.5 kilobars was ineffective in dissociating the mMDH dimer. However, the mMDH dimer was completely dissociated in 1.5 M guanidinium hydrochloride. Dilution of a mMDH-fluorescein conjugate, prepared using a Tris buffer protocol, did show dissociation, which can be attributed to aggregates present in these preparations. These results are considered in light of the disparities in the literature concerning the properties of the mMDH dimer-monomer equilibrium.
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Affiliation(s)
- S A Sánchez
- Instituto de Química, Universidad Católica de Valparaíso, Chile
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Jiskoot W, Hlady V, Naleway JJ, Herron JN. Application of fluorescence spectroscopy for determining the structure and function of proteins. PHARMACEUTICAL BIOTECHNOLOGY 1995; 7:1-63. [PMID: 8564015 DOI: 10.1007/978-1-4899-1079-0_1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- W Jiskoot
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City 84112, USA
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Cerovic ZG, Morales F, Moya I. Time-resolved spectral studies of blue-green fluorescence of leaves, mesophyll and chloroplasts of sugar beet (Beta vulgaris L.). BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1994. [DOI: 10.1016/0005-2728(94)90022-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ghiron CA, Eftink MR, Waters JK, Emerich DW. Fluorescence studies with malate dehydrogenase from Bradyrhizobium japonicum 3I1B-143 bacteroids: a two-tryptophan containing protein. Arch Biochem Biophys 1990; 283:102-6. [PMID: 2241162 DOI: 10.1016/0003-9861(90)90618-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A number of fluorescence studies, both of trp residues and bound NADH, have been reported for porcine malate dehydrogenase (MDH). The large number of trp residues (six) complicates the interpretation of some studies. To circumvent this we have performed studies with a two-tryptophan (per subunit) MDH from Bradyrhizobium japonicum 3I1B-143 bacteroids. We have performed phase/modulation fluorescence lifetime measurements, as a function of temperature and added quencher KI, in order to resolved the 1.2-ns (blue) and 6.5-ns (red) contributions from the two classes of trp residues. Anisotropy decay studies have also been performed. The binding of NADH dynamically quenches the fluorescence of both trp residues, but, unlike mammalian cytoplasmic and mitochondrial MDH, there is not a large enhancement in fluorescence of bound NADH upon forming a ternary complex with either tartronic acid or D-malate.
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Affiliation(s)
- C A Ghiron
- Department of Biochemistry, University of Missouri, Columbia 65211
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