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Golubev D, Platonova E, Zemskaya N, Shevchenko O, Shaposhnikov M, Nekrasova P, Patov S, Ibragimova U, Valuisky N, Borisov A, Zhukova X, Sorokina S, Litvinov R, Moskalev A. Berberis vulgaris L. extract supplementation exerts regulatory effects on the lifespan and healthspan of Drosophila through its antioxidant activity depending on the sex. Biogerontology 2024; 25:507-528. [PMID: 38150086 DOI: 10.1007/s10522-023-10083-6] [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: 09/20/2023] [Accepted: 11/13/2023] [Indexed: 12/28/2023]
Abstract
Worldwide the aging population continues to increase, so the concept of healthy longevity medicine has become increasingly significant in modern society. Berberis vulgaris L. fruits serve as a functional food supplement with a high concentration of bioactive compounds, which offer numerous health-promoting benefits. The goal of this study was to investigate the geroprotective effect of Berberis vulgaris L. extract. Here we show that extract of Berberis vulgaris L. can, depending on concentrate, increases lifespan up to 6%, promote healthspan (stress resistance up to 35%, locomotor activity up to 25%, integrity of the intestinal barrier up to 12%, metabolic rate up to 5%) of Drosophila melanogaster (in vitro) and exhibits antioxidant (using red blood cell tests) and antiglycation activity (using glycation of bovine serum albumin) (in vitro). In addition to this, the extract does not exhibit cytotoxic properties in vitro, unlike the well-known polyphenolic compound quercetin. qRT-PCR has revealed the involvement of metabolic, heat shock response and lipid metabolism genes in the observed effects.
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Affiliation(s)
- Denis Golubev
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
- Pitirim Sorokin Syktyvkar State University, Syktyvkar, Russian Federation, 167001
| | - Elena Platonova
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
| | - Nadezhda Zemskaya
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
| | - Oksana Shevchenko
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
| | - Mikhail Shaposhnikov
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
| | - Polina Nekrasova
- Institute of Chemistry of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
| | - Sergey Patov
- Institute of Chemistry of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982
| | - Umida Ibragimova
- Volgograd State Medical University, Volgograd, Russian Federation, 400131
| | - Nikita Valuisky
- Volgograd State Medical University, Volgograd, Russian Federation, 400131
| | - Alexander Borisov
- Volgograd State Medical University, Volgograd, Russian Federation, 400131
| | - Xenia Zhukova
- Volgograd State Medical University, Volgograd, Russian Federation, 400131
| | - Svetlana Sorokina
- Volgograd State Medical University, Volgograd, Russian Federation, 400131
| | - Roman Litvinov
- Volgograd State Medical University, Volgograd, Russian Federation, 400131
| | - Alexey Moskalev
- Institute of Biology of Komi Scientific Centre of the Ural Branch of the RAS, Syktyvkar, Russian Federation, 167982.
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2
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Wheeler JJ, Davis JM, Mishra SK. A Calcium Imaging Approach to Measure Functional Sensitivity of Neurons. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2022; 2413:97-106. [PMID: 35044658 DOI: 10.1007/978-1-0716-1896-7_11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pain associated with chemotherapy and radiation therapy is one of the most common reasons for discontinuation of these treatments and has a dramatic effect on the quality of life in cancer patients. However, the mechanisms underlying chemotherapy and radiation therapy associated with pain are not well understood. Pain sensations are mediated through sensory neurons whose cell bodies are located in the dorsal root ganglia (DRG). Pain mediators activate these sensory neurons causing an influx of ions, including calcium. One common technique to study pain is to use primary cell culturing mouse DRG to study this calcium influx in vitro. This protocol details from an isolation to culture and maintenance of DRG neurons and functional recording using calcium imaging caused by either pain mediators or neuronal sensitization that are induced by drugs that are often used in the treatment of cancer.
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Affiliation(s)
- Joshua J Wheeler
- Department of Molecular Biomedical Sciences, North Carolina State University College of Veterinary Medicine, Raleigh, NC, USA.,Comparative Medicine Institute, North Carolina State University, Raleigh, NC, USA
| | - John M Davis
- Department of Psychology, University of Chicago, Chicago, IL, USA
| | - Santosh K Mishra
- Comparative Medicine Institute, North Carolina State University, Raleigh, NC, USA. .,Comparative Pain Research and Education Center, North Carolina State University, Raleigh, NC, USA.
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3
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Zhang G, Jacquemin D, Buccella D. Tuning the Spectroscopic Properties of Ratiometric Fluorescent Metal Indicators: Experimental and Computational Studies on Mag-fura-2 and Analogues. J Phys Chem B 2017; 121:696-705. [DOI: 10.1021/acs.jpcb.6b11045] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Guangqian Zhang
- Department
of Chemistry, New York University, New York, New York 10003, United States
| | - Denis Jacquemin
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
- Institut Universitaire de France, 1 rue Descartes, F-75231 Paris Cedex 05, France
| | - Daniela Buccella
- Department
of Chemistry, New York University, New York, New York 10003, United States
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4
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Milovic C, Oses C, Villalón M, Uribe S, Lizama C, Prieto C, Andia ME, Irarrazaval P, Tejos C. Calcium (Ca2+) waves data calibration and analysis using image processing techniques. BMC Bioinformatics 2013; 14:162. [PMID: 23679062 PMCID: PMC3667061 DOI: 10.1186/1471-2105-14-162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 05/07/2013] [Indexed: 11/16/2022] Open
Abstract
Background Calcium (Ca2+) propagates within tissues serving as an important information carrier. In particular, cilia beat frequency in oviduct cells is partially regulated by Ca2+ changes. Thus, measuring the calcium density and characterizing the traveling wave plays a key role in understanding biological phenomena. However, current methods to measure propagation velocities and other wave characteristics involve several manual or time-consuming procedures. This limits the amount of information that can be extracted, and the statistical quality of the analysis. Results Our work provides a framework based on image processing procedures that enables a fast, automatic and robust characterization of data from two-filter fluorescence Ca2+ experiments. We calculate the mean velocity of the wave-front, and use theoretical models to extract meaningful parameters like wave amplitude, decay rate and time of excitation. Conclusions Measurements done by different operators showed a high degree of reproducibility. This framework is also extended to a single filter fluorescence experiments, allowing higher sampling rates, and thus an increased accuracy in velocity measurements.
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Affiliation(s)
- Carlos Milovic
- Department of Electrical Engineering, Pontificia Universidad Catolica de Chile, Santiago, Chile.
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5
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Chen Y, Chen ZP, Yang J, Jin JW, Zhang J, Yu RQ. Quantitative Fluorescence Spectroscopy in Turbid Media: A Practical Solution to the Problem of Scattering and Absorption. Anal Chem 2013; 85:2015-20. [DOI: 10.1021/ac302815e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yao Chen
- State Key Laboratory
of Chemo/Biosensing and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China
| | - Zeng-Ping Chen
- State Key Laboratory
of Chemo/Biosensing and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China
| | - Jing Yang
- State Key Laboratory
of Chemo/Biosensing and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China
| | - Jing-Wen Jin
- State Key Laboratory
of Chemo/Biosensing and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China
| | - Juan Zhang
- State Key Laboratory
of Chemo/Biosensing and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China
| | - Ru-Qin Yu
- State Key Laboratory
of Chemo/Biosensing and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, PR China
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6
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Li S, Zhao Z, Zhou X, Liu S. The effect of lead on intracellular Ca2+ in mouse lymphocytes. Toxicol In Vitro 2008; 22:1815-9. [DOI: 10.1016/j.tiv.2008.08.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Revised: 07/19/2008] [Accepted: 08/12/2008] [Indexed: 11/29/2022]
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Caplanusi A, Fuller AJ, Gonzalez-Villalobos RA, Hammond TG, Navar LG. Metabolic inhibition-induced transient Ca2+ increase depends on mitochondria in a human proximal renal cell line. Am J Physiol Renal Physiol 2007; 293:F533-40. [PMID: 17522266 DOI: 10.1152/ajprenal.00030.2007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
During ischemia or hypoxia an increase in intracellular cytosolic Ca(2+) induces deleterious events but is also implicated in signaling processes triggered in such conditions. In MDCK cells (distal tubular origin), it was shown that mitochondria confer protection during metabolic inhibition (MI), by buffering the Ca(2+) overload via mitochondrial Na(+)-Ca(2+) exchanger (NCX). To further assess this process in cells of human origin, human cortical renal epithelial cells (proximal tubular origin) were subjected to MI and changes in cytosolic Ca(2+) ([Ca(2+)](i)), Na(+), and ATP concentrations were monitored. MI was accomplished with both antimycin A and 2-deoxyglucose and induced a 3.5-fold increase in [Ca(2+)](i), reaching 136.5 +/- 15.8 nM in the first 3.45 min. Subsequently [Ca(2+)](i) dropped and stabilized to 62.7 +/- 7.3 nM by 30 min. The first phase of the transient increase was La(3+) sensitive, not influenced by diltiazem, and abolished when mitochondria were deenergized with the protonophore carbonylcyanide p-trifluoromethoxyphenylhydrazone. The subsequent recovery phase was impaired in a Na(+)-free medium and weakened when the mitochondrial NCX was blocked with 7-chloro-5-(2-chlorophenyl)-1,5-dihydro-4,1-benzothiazepin-2(3H)-one (CGP-37157). Thus Ca(2+) entry is likely mediated by store-operated Ca(2+) channels and depends on energized mitochondria, whereas [Ca(2+)](i) recovery relied partially on the activity of mitochondrial NCX. These results indicate a possible mitochondrial-mediated signaling process triggered by MI, support the hypothesis that mitochondrial NCX has an important role in the Ca(2+) clearance, and overall suggest that mitochondria play a preponderant role in the regulation of responses to MI in human renal epithelial cells.
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Affiliation(s)
- Adrian Caplanusi
- Department of Physiology, Tulane University Health Sciences Center, New Orleans, Louisiana, USA
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8
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Maton L, Taziaux D, Soumillion JP, Habib Jiwan JL. About the use of an amide group as a linker in fluoroionophores: competition between linker and ionophore acting as chelating groups. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b501613d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Smets I, Caplanusi A, Despa S, Molnar Z, Radu M, VandeVen M, Ameloot M, Steels P. Ca2+ uptake in mitochondria occurs via the reverse action of the Na+/Ca2+ exchanger in metabolically inhibited MDCK cells. Am J Physiol Renal Physiol 2003; 286:F784-94. [PMID: 14665432 DOI: 10.1152/ajprenal.00284.2003] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
In ischemic or hypoxic tissues, elevated Ca2+ levels have emerged as one of the main damaging agents among other Ca2+-independent mechanisms of cellular injury. Because mitochondria, besides the endoplasmic reticulum, play a key role in the maintainance of cellular Ca2+ homeostasis, alterations in the mitochondrial Ca2+ content ([Ca2+]m) were monitored in addition to changes in cytosolic Ca2+ concentration ([Ca2+]i) during metabolic inhibition (MI) in renal epithelial Madin-Darby canine kidney (MDCK) cells. [Ca2+]i and [Ca2+]m were monitored via, respectively, fura 2 and rhod 2 measurements. MI induced an increase in [Ca2+]i reaching 631+/-78 nM in approximately 20 min, followed by a decrease to 118+/-9 nM in the next approximately 25 min. A pronounced drop in cellular ATP levels and a rapid increase in intracellular Na+ concentrations in the first 20 min of MI excluded Ca2+ efflux in the second phase via plasma membrane ATPases or Na+/Ca2+ exchangers (NCE). Mitochondrial rhod 2 intensities increased to 434+/-46% of the control value during MI, indicating that mitochondria sequester Ca2+ during MI. The mitochondrial potential (deltapsim) was lost in 20 min of MI, excluding mitochondrial Ca2+ uptake via the deltapsim-dependent mitochondrial Ca2+ uniporter after 20 min of MI. Under Na+-free conditions, or when CGP-37157, a specific inhibitor of the mitochondrial NCE, was used, no drop in [Ca2+]i was seen during MI, whereas the MI-induced increase in mitochondrial rhod 2 fluorescence was strongly reduced. To our knowledge, this study is the first to report that in metabolically inhibited renal epithelial cells mitochondria take up Ca2+ via the NCE acting in the reverse mode.
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Affiliation(s)
- Ilse Smets
- MBW-Dept. of Physiology, Limburgs Universitair Centrum/Transnationale Universiteit Limburg, Biomedisch Onderzoeksinstituut, Universitaire Campus Gebouw D, B-3590 Diepenbeek, Belgium.
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10
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Malval JP, Gosse I, Morand JP, Lapouyade R. Photoswitching of cation complexation with A monoaza-crown dithienylethene photochrome. J Am Chem Soc 2002; 124:904-5. [PMID: 11829588 DOI: 10.1021/ja0167203] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A photochromic dithienylethene, bearing a phenyl azacrown as an ionophore and a formyl group as an electron-accepting substituent, changes its binding ability for Ca2+ by a factor higher than 103 by photoirradiation. This new photoionochromic displays a wavelength-dependent competition between fluorescence and photocyclization assigned to a red-shifted absorption of the fluorescing conformer compared to the absorption of the photoreactive conformer.
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Affiliation(s)
- Jean-Pierre Malval
- Laboratoire d'Analyse Chimique par Reconnaissance Moléculaire, Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux, 16 Avenue Pey Berland, 33607 Pessac Cedex France
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11
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Integrated Supramolecular Systems: From Sensors to Switches. FLUORESCENCE SPECTROSCOPY, IMAGING AND PROBES 2002. [DOI: 10.1007/978-3-642-56067-5_4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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12
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Valeur B, Leray I. PCT (Photoinduced Charge Transfer) Fluorescent Molecular Sensors for Cation Recognition. NEW TRENDS IN FLUORESCENCE SPECTROSCOPY 2001. [DOI: 10.1007/978-3-642-56853-4_10] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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13
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14
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Despa S, Vecer J, Steels P, Ameloot M. Fluorescence lifetime microscopy of the Na+ indicator Sodium Green in HeLa cells. Anal Biochem 2000; 281:159-75. [PMID: 10870831 DOI: 10.1006/abio.2000.4560] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study investigates the usefulness of lifetime measurements of Sodium Green for evaluating intracellular Na+ concentration ([Na+]i) in HeLa cells. Frequency-domain lifetime measurements are performed in HeLa cells and in different buffer solutions (with and without K+ and bovine serum albumin). In all cases, the fluorescence decays of Sodium Green are multiexponential, with decay times independent of [Na+]. Three relaxation times are found in the various buffer solutions. Binding of the indicator to albumin results in an increase in the long and intermediate decay times. For Sodium Green inside HeLa cells, the intensity decay can be approximated by a biexponential. The ratio of the fractional intensity of the long decay time (tau2 = 2.4 +/- 0.2 ns) to that of the short component (tau1 = 0.4 +/- 0.1 ns) increases with [Na+]i. The changes in fluorescence decay with [Na+] are significantly less pronounced in cells as compared with the buffer solutions. Similar values for the resting [Na+]i were estimated from lifetime measurements of Sodium Green and from ratiometric measurements using SBFI. Alternatively, [Na+]i can be monitored by measuring only the phase angle at the modulation frequency of 160 MHz. The usefulness of this latter approach is demonstrated by following the changes in [Na+]i induced by reversible inhibition of the Na+/K+ pump.
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Affiliation(s)
- S Despa
- Laboratory of Physiology, Biomedisch Onderzoeksinstituut DWI, Limburgs Universitair Centrum, Universitaire Campus, Diepenbeek, Belgium
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15
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Affiliation(s)
- Eugene Novikov
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium, Systems Analysis Department, Belarussian State University, F. Skariny Ave. 4, Minsk 220050, Belarus, and Department of General Food Chemistry, Technical University, Stefanowskiego 4/10, 90-924 Lodz, Poland
| | - Agnieszka Stobiecka
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium, Systems Analysis Department, Belarussian State University, F. Skariny Ave. 4, Minsk 220050, Belarus, and Department of General Food Chemistry, Technical University, Stefanowskiego 4/10, 90-924 Lodz, Poland
| | - Noël Boens
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200 F, 3001 Heverlee, Belgium, Systems Analysis Department, Belarussian State University, F. Skariny Ave. 4, Minsk 220050, Belarus, and Department of General Food Chemistry, Technical University, Stefanowskiego 4/10, 90-924 Lodz, Poland
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16
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Despa S, Steels P, Ameloot M. Fluorescence lifetime microscopy of the sodium indicator sodium-binding benzofuran isophthalate in HeLa cells. Anal Biochem 2000; 280:227-41. [PMID: 10790305 DOI: 10.1006/abio.2000.4505] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The behavior of the sodium indicator sodium-binding benzofuran isophthalate (SBFI) is investigated in HeLa cells by time-resolved fluorescence microscopy. The fluorescence relaxation of SBFI in HeLa cells can be described by a triexponential for intracellular sodium concentration ([Na(+)](i)) between 0 and 90 mM. Changes in [Na(+)](i) affect neither the fluorescence relaxation times (0.21, 0. 60, and 2.7 ns) nor the average decay time (2.2 ns). The preexponential factor of the shortest decay time is negative. However, the ratio of the fluorescence excitation signal at 340 nm to that at 380 nm increases with [Na(+)](i). To elucidate the behavior of SBFI in cells, experiments are performed on SBFI in buffer at various concentrations of sodium, potassium, and bovine serum albumin (BSA) and at various viscosities. The fluorescence decay is triexponential only in the presence of BSA. The relaxation times are independent of [Na(+)] and [BSA]. The preexponential factor of the shortest decay time is negative from a certain [BSA] on, which depends on [Na(+)]. The data indicate that interactions with intracellular components rather than microviscosity influence the SBFI behavior in cells. A model is suggested in which the fluorescence intensities are mainly determined by the signals from the Na(+) subsetSBFI and SBFI subsetprotein complexes.
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Affiliation(s)
- S Despa
- Laboratory of Physiology, Limburgs Universitair Centrum, Diepenbeek, B-3590, Belgium
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17
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Meuwis K, Boens N, De Schryver FC, Ameloot M, Gallay J, Vincent M. Photophysics of SBFO: A Fluorescent Indicator for Na+. J Phys Chem B 1998. [DOI: 10.1021/jp972224i] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katrien Meuwis
- Department of Chemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium, Limburgs Universitair Centrum, 3590 Diepenbeek, Belgium, and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, 91405 Orsay, France
| | - Noël Boens
- Department of Chemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium, Limburgs Universitair Centrum, 3590 Diepenbeek, Belgium, and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, 91405 Orsay, France
| | - Frans C. De Schryver
- Department of Chemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium, Limburgs Universitair Centrum, 3590 Diepenbeek, Belgium, and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, 91405 Orsay, France
| | - Marcel Ameloot
- Department of Chemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium, Limburgs Universitair Centrum, 3590 Diepenbeek, Belgium, and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, 91405 Orsay, France
| | - Jacques Gallay
- Department of Chemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium, Limburgs Universitair Centrum, 3590 Diepenbeek, Belgium, and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, 91405 Orsay, France
| | - Michel Vincent
- Department of Chemistry, Katholieke Universiteit Leuven, 3001 Heverlee, Belgium, Limburgs Universitair Centrum, 3590 Diepenbeek, Belgium, and Laboratoire pour l'Utilisation du Rayonnement Electromagnétique, Centre Universitaire Paris-Sud, 91405 Orsay, France
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18
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van Stam J, De Schryver FC, Boens N, Hermans B, Jérôme R, Trossaert G, Goethals E, Schacht E. Intramolecular Excited-State Processes of a Halato-Telechelic Polymer, Evaluated by Global Compartmental Analysis of the Fluorescence Decay Surface with the Use of Model Compounds. Macromolecules 1997. [DOI: 10.1021/ma961271q] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan van Stam
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Frans C. De Schryver
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Noël Boens
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Bart Hermans
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Robert Jérôme
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Geert Trossaert
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Erik Goethals
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
| | - Etienne Schacht
- Departement Scheikunde, Katholieke Universiteit Leuven, Celestijnenlaan 200F, BE-3001 Heverlee, Belgium, Université de Liège, Sart Tilman, BE-4000 Liège, Belgium, and Universiteit Gent, BE-9000 Gent, Belgium
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de Silva AP, Gunaratne HQN, Gunnlaugsson T, Huxley AJM, McCoy CP, Rademacher JT, Rice TE. Signaling Recognition Events with Fluorescent Sensors and Switches. Chem Rev 1997; 97:1515-1566. [PMID: 11851458 DOI: 10.1021/cr960386p] [Citation(s) in RCA: 5169] [Impact Index Per Article: 191.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Molski A, Boens N. Convolution Kinetics with Generation and Decay for Reversible Excited-State Processes. J Phys Chem A 1997. [DOI: 10.1021/jp9630075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrzej Molski
- Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
| | - Noël Boens
- Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium
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Dutt GB, Boens N, Kowalczyk A, De Schryver FC, Ameloot M. Experimental Design in Global Compartmental Analysis of Reversible Intramolecular Two-State Excited-State Processes with Added Quencher. J Phys Chem A 1997. [DOI: 10.1021/jp962147b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- G. Bhaskar Dutt
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, and Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium
| | - Noël Boens
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, and Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium
| | - Andrzej Kowalczyk
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, and Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium
| | - Frans C. De Schryver
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, and Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium
| | - Marcel Ameloot
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, and Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium
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22
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Kowalczyk A, Boens N, Ameloot M. Determination of ground-state dissociation constant by fluorescence spectroscopy. Methods Enzymol 1997; 278:94-113. [PMID: 9170311 DOI: 10.1016/s0076-6879(97)78008-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- A Kowalczyk
- Institute of Physics, Nicholas Copernicus University, Toruń, Poland
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Abstract
We have developed a fluorescence ratio-imaging system which is based on a 12 bit, 2 MHz slow scan CCD camera and a patented (patent number P 42 28 366.3-52) polychromatic illumination system. The latter produces monochromatic light (12 nm bandwidth) of high intensity (> 3 mW between 300 and 500 nm) and allows one to switch to any wavelength between 260 and 680 nm in less than 3.5 ms in a computer-controlled fashion. The possibility to execute complex wavelength protocols facilitates multiple dye measurements with optimal exposure time for a given wavelength and the return to a dark phase in between exposures. Moreover, it allows sweeping over extended spectral regions in order to determine optimal experimental conditions for a given task. Wavelength selection is performed by a diffraction grating which is mounted onto a galvanometric scanner. The grating is illuminated by white light from a 75 W xenon lamp, using exclusively reflective optics, and the diffracted monochromatic light is coupled into the microscope by means of a single fibre quartz light guide. The epifluorescence optics, a special, achromatic, aplanatic UV condensor, image the exit face plate of the fibre into the specimen plane of an inverted microscope. This 'critical illumination' yields better homogeneity in the specimen plane than the classical Köhler illumination. Thus, with the Zeiss Fluar objective 40 x, NA = 1.3, fluence rates close to 10(23) photons m2 s-1 may be achieved at 340 nm. A DOS programme has been written in 'C' which controls both the monochromator and slow scan imaging system. It can acquire up to 13 full frames per s, and in its binning and skipping mode up to 100 subframes per s may be acquired. The frame-transfer structure of the chip allows one to acquire images at wavelength 'B' while simultaneously writing image data previously acquired at wavelength 'A' into the computer.
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Affiliation(s)
- P Messler
- Abteilung Physikalische Biologie der Ludwig-Maximilians-Universität München, Germany
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Martin MM, Plaza P, Meyer YH, Badaoui F, Bourson J, Lefèvre JP, Valeur B. Steady-State and Picosecond Spectroscopy of Li+ or Ca2+ Complexes with a Crowned Merocyanine. Reversible Photorelease of Cations. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp952783u] [Citation(s) in RCA: 79] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Boens N, Kowalczyk A, Cielen E. Identifiability of Irreversible Intermolecular Two-State Excited-State Processes. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9532733] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Noël Boens
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium
| | - Andrzej Kowalczyk
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium
| | - Els Cielen
- Department of Chemistry, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium
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Meuwis K, Depuydt G, Boens N, C. De Schryver F. Comparison of simultaneous biexponential and compartmental analyses of fluorescence decay surfaces of intermolecular two-state excited-state processes. Chem Phys Lett 1995. [DOI: 10.1016/0009-2614(95)01169-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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