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Du W, Tian Y, Feng YA, Cong XW, Tan R, Wang YW, Peng Y. A highly sensitive and colorimetric fluorescent probe for visualizing hydroxylamine in immune cells. Anal Chim Acta 2024; 1318:342941. [PMID: 39067920 DOI: 10.1016/j.aca.2024.342941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 06/30/2024] [Accepted: 07/02/2024] [Indexed: 07/30/2024]
Abstract
BACKGROUND Hydroxylamine (HA) is vital industrial raw material and pharmaceutical intermediate. In addition, HA is an important cellular metabolite, which is intermediate in the formation of nitric oxide and nitroxide. However, excessive amounts of HA are toxic to both animals and plants. Conventional methods for the detection of HA are cumbersome and complicated. The detection of HA with fluorescent probes is convenient and sensitive. There are few probes available for the detection of hydroxylamine. Therefore, a fluorescent probe for the sensitive and selective detection of HA was developed in this work. RESULTS A coumarin derivative SWJT-22 was synthesized as a colorimetric fluorescent probe to detect hydroxylamine (HA), with high sensitivity and selectivity. The detection limit of the probe to HA was 0.15 μM, which was lower than most probes of HA. Upon the addition of HA to aqueous solution containing SWJT-22, the color of the solution changed from orange to yellow, and the fluorescence color also changed from orange to green. The reaction mechanism of SWJT-22 to HA was confirmed by 1H NMR titrations, mass spectrometry and round bottom flask experiments. Moreover, SWJT-22 had been fabricated into portable test strips for the detection of HA. SWJT-22 had been successfully used in cellular imaging and could detect both endogenous and exogenous HA in HeLa cells and RAW 264.7 cells. SIGNIFICANCE Due to the physiological role of hydroxylamine in organisms, it is crucial to detect hydroxylamine selectively and sensitively. This work provided a convenient tool for the detection of hydroxylamine, not only to detect endogenous and exogenous HA in cells, but also made into portable test strips. The HA fluorescent probe SWJT-22 is expected to promote the study of HA in physiological processes.
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Affiliation(s)
- Wei Du
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Ministry of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Yang Tian
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Ministry of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Yu-An Feng
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Ministry of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
| | - Xiao-Wei Cong
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 730000, People's Republic of China
| | - Rui Tan
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Ministry of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China; State Key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, 210023, Jiangsu, People's Republic of China.
| | - Ya-Wen Wang
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Ministry of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China.
| | - Yu Peng
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Ministry of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, People's Republic of China
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Bu L, Chen X, Wu Y, Zhou S. Enhanced formation of 2,6-dichloro-4-nitrophenol during chlorination after UV/chlorine process: free amino acid versus oligopeptide. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Sun Y, Sun P, Li Z, Qu L, Guo W. Natural flavylium-inspired far-red to NIR-II dyes and their applications as fluorescent probes for biomedical sensing. Chem Soc Rev 2022; 51:7170-7205. [PMID: 35866752 DOI: 10.1039/d2cs00179a] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Fluorescent probes that emit in the far-red (600-700 nm), first near-infrared (NIR-I, 700-900 nm), and second NIR (NIR-II, 900-1700 nm) regions possess unique advantages, including low photodamage and deep penetration into biological samples. Notably, NIR-II optical imaging can achieve tissue penetration as deep as 5-20 mm, which is critical for biomedical sensing and clinical applications. Much research has focused on developing far-red to NIR-II dyes to meet the needs of modern biomedicine. Flavylium compounds are natural colorants found in many flowers and fruits. Flavylium-inspired dyes are ideal platforms for constructing fluorescent probes because of their far-red to NIR emissions, high quantum yields, high molar extinction coefficients, and good water solubilities. The synthetic and structural diversities of flavylium dyes also enable NIR-II probe development, which markedly advance the field of NIR-II in vivo imaging. In the last decade, there have been huge developments in flavylium-inspired dyes and their applications as far-red to NIR fluorescent probes for biomedical applications. In this review, we highlight the optical properties of representative flavylium dyes, design strategies, sensing mechanisms, and applications as fluorescent probes for detecting and visualizing important biomedical species and events. This review will prompt further research not only on flavylium dyes, but also into all far-red to NIR fluorophores and fluorescent probes. Moreover, this interest will hopefully spillover into applications related to complex biological systems and clinical treatments, ranging in focus from the sub-organelle to whole-animal levels.
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Affiliation(s)
- Yuanqiang Sun
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Pengjuan Sun
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Zhaohui Li
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Lingbo Qu
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Wei Guo
- School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China.
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Wu Y, Zhang W, Bu L, Zhu S, Wang J, Zhou S. UV-induced activation of organic chloramine: Radicals generation, transformation pathway and DBP formation. JOURNAL OF HAZARDOUS MATERIALS 2022; 421:126459. [PMID: 34365233 DOI: 10.1016/j.jhazmat.2021.126459] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/03/2021] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Organic chloramines of little disinfection efficacy commonly exist in disinfection process (chlor(am)ination) due to the wide presence of organic amines in water, of which N-chlorodimethylamine (CDMA) is a typical one. For the first time, UV photolysis for the activation of CDMA was investigated. UV photolysis caused the cleavage of N-Cl bond in CDMA to form Cl• and subsequently HO•, both of which are dominant contributors to the destruction of model contaminant bisphenol A (BPA). Typical spectra of HO• were detected by electron paramagnetic resonance (EPR) experiments, while spectra of reactive nitrogen species (RNS) were not detected during UV photolysis of CDMA. The increase of pH (6.0-8.0), HCO3-/CO32-, Cl- and nature organic matter inhibited the degradation of BPA. We proposed pathways of CDMA and BPA degradation based on the identified transformation products. UV photolysis of CDMA and BPA reduced the formation of N-nitrosodimethylamine (NDMA) at pH 8.0, but increased the formation of trichloronitromethane (TCNM) at pH 7.0 and 8.0. The increasing toxicity and the formation of TCNM and NDMA gave us a hint that formation of organic chloramines should be concerned.
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Affiliation(s)
- Yangtao Wu
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China
| | - Weiqiu Zhang
- School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, GA 30332, United States
| | - Lingjun Bu
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China
| | - Shumin Zhu
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China.
| | - Jue Wang
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China
| | - Shiqing Zhou
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China
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5
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Photolysis of nitrate by solar light in agricultural runoffs: Degradation of emerging contaminant vs. formation of unintended products. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118751] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Nitric Oxide Modulation by Folic Acid Fortification. Antioxidants (Basel) 2020; 9:antiox9050393. [PMID: 32392814 PMCID: PMC7278735 DOI: 10.3390/antiox9050393] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/04/2020] [Accepted: 05/04/2020] [Indexed: 12/02/2022] Open
Abstract
Folic acid (FA) can be protected the neural tube defects (NTDs) causing nitric oxide (NO) induction, but the alleviation mechanism of the detailed FA function against NO has not yet been clarified. This study focused on elucidation of the interaction of FA and NO. FA suppressed nitrite accumulation as the NO indicator in lipopolysaccharide (LPS)-stimulated RAW264.7 cells, then the expression of the iNOS gene due to the LPS treatment was not inhibited by FA, suggesting that FA can modulate against NO or nitrogen radicals. NOR3 (4-ethyl-2-hydroxyamino-5-nitro-3-hexenamide) as the NO donor was used for evaluation of the NO scavenging activity of FA. FA suppressed the nitrite accumulation in a dose-dependent manner. To confirm the reaction product of FA and NO (FA-NO), liquid chromatography–mass spectrometry (LC/MS) was used to measure a similar system containing NOR3 and FA, and then detected the mass numbers of the FA-NO as m/z 470.9 (M + H)+ and m/z 469.1 (M − H)−. In addition, the adducts of the FA-NO derived from 14NO and 15NO gave individual mass numbers of the isotopic ratio of nitrogen for the following products: FA-14NO, m/z 471.14 (M + H)+; m/z 469.17 (M − H)− and FA-15NO, m/z 472.16 (M + H)+; m/z 470.12 (M − H)–. To clarify the detailed NO scavenging action of FA, an electron spin resonance (ESR) study for radical detecting of the system containing carboxy-PTIO (2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) as an NO detection reagent in the presence of NOR3 and FA was performed. The carboxy-PTI (2-carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl) radical produced from the reaction with NO reduced in the presence of FA showing that FA can directly scavenge NO. These results indicated that NO scavenging activity of FA reduced the accumulation of nitrite in the LPS-stimulated RAW264.7 cells. The NO modulation due to FA would be responsible for the alleviation from the failure in neural tube formation causing a high level of NO production.
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Dong B, Tian M, Kong X, Song W, Lu Y, Lin W. Förster Resonance Energy Transfer-Based Fluorescent Probe for the Selective Imaging of Hydroxylamine in Living Cells. Anal Chem 2019; 91:11397-11402. [PMID: 31402659 DOI: 10.1021/acs.analchem.9b02737] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Hydroxylamine (HA) is an important product of cell metabolism and plays a significant role in many biological processes, and therefore, real-time imaging of HA is of great importance for the in-depth study of its physiological and pathological functions. However, a HA-specific fluorescent probe is currently lacking primarily because the highly selective HA-responsive site is undeveloped. To address this critical issue, we present a HA-specific FRET-based fluorescent probe (RhChr) for the selective detection of HA in living systems. Inspired by aza-Michael addition, the unsaturated system appended with an iminium ion was employed as the new HA-specific response site. In response to HA, RhChr provided a ratiometric signal output with excellent selectivity toward HA over biothiols and ammonia. We have demonstrated that RhChr could be applied for the ratiometric imaging of endogenous HA in living cells and the evaluation of xanthine oxidase (XOD) activity in living organs.
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Affiliation(s)
- Baoli Dong
- Institute of Fluorescent Probes for Biological Imaging, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering , University of Jinan , Jinan , Shandong 250022 , People's Republic of China
| | - Minggang Tian
- Institute of Fluorescent Probes for Biological Imaging, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering , University of Jinan , Jinan , Shandong 250022 , People's Republic of China
| | - Xiuqi Kong
- Institute of Fluorescent Probes for Biological Imaging, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering , University of Jinan , Jinan , Shandong 250022 , People's Republic of China
| | - Wenhui Song
- Institute of Fluorescent Probes for Biological Imaging, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering , University of Jinan , Jinan , Shandong 250022 , People's Republic of China
| | - Yaru Lu
- Institute of Fluorescent Probes for Biological Imaging, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering , University of Jinan , Jinan , Shandong 250022 , People's Republic of China
| | - Weiying Lin
- Institute of Fluorescent Probes for Biological Imaging, School of Chemistry and Chemical Engineering, School of Materials Science and Engineering , University of Jinan , Jinan , Shandong 250022 , People's Republic of China
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Taira J, Tsuchida E, Katoh MC, Uehara M, Ogi T. Antioxidant capacity of betacyanins as radical scavengers for peroxyl radical and nitric oxide. Food Chem 2014; 166:531-536. [PMID: 25053090 DOI: 10.1016/j.foodchem.2014.05.102] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 05/12/2014] [Accepted: 05/17/2014] [Indexed: 11/30/2022]
Abstract
This study was designed to assess the antioxidant capacity of betacyanins as indole derived plant pigments, such as betanin, phyllocactin and betanidin. The antioxidant capacity of the betacyanins was evaluated as an index of radical scavenging ability using the peroxyl radical generating system in the presence of AAPH and NO generating system using NOR3 as an NO donor. The peroxyl radical scavenging capacity was dose-dependent in the low concentration range (25-100 nM). The mol-Trolox equivalent activity/mol compound (mol-TEA/mol-compound) as an index of the antioxidant capacity indicated the following order at 10.70 ± 0.01, 3.31 ± 0.14 and 2.83 ± 0.01 mol-TEA/mol-compound for betanidin, betanin and phyllocactin, respectively. In addition, betacyanins reduced the nitrite-level in the low concentration range of 2.5-20 μM. The IC₅₀ values (μM) of nitrogen radical scavenging activity were 24.48, 17.51 and 6.81 for betanin, phyllocactin and betanidin. ESR studies provided evidence that the compounds directly scavenged NO. These results indicated that betacyanins have a strong antioxidant capacity, particularly betanidin with a catechol group had higher activity than those of the glycoside of betacyanins. This study demonstrated that the betacyanins will be useful as natural pigments to provide defence against oxidative stress.
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Affiliation(s)
- Junsei Taira
- Department of Bioresource Technology, Okinawa National College of Technology, 905 Henoko, Nago City, Okinawa 905-2192, Japan.
| | - Eito Tsuchida
- Department of Bioresource Technology, Okinawa National College of Technology, 905 Henoko, Nago City, Okinawa 905-2192, Japan
| | - Megumi C Katoh
- Department of Bioresource Technology, Okinawa National College of Technology, 905 Henoko, Nago City, Okinawa 905-2192, Japan
| | - Masatsugu Uehara
- Department of Bioresource Technology, Okinawa National College of Technology, 905 Henoko, Nago City, Okinawa 905-2192, Japan
| | - Takayuki Ogi
- Okinawa Industrial Technology Center, 12-2 Suzaki, Uruma City, Okinawa 904-2234, Japan
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9
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Helbo S, Fago A, Gesser H. Myoglobin-dependent O2 consumption of the hypoxic trout heart. Comp Biochem Physiol A Mol Integr Physiol 2013; 165:40-5. [DOI: 10.1016/j.cbpa.2013.01.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 01/14/2013] [Accepted: 01/17/2013] [Indexed: 11/29/2022]
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10
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Helbo S, Weber RE, Fago A. Expression patterns and adaptive functional diversity of vertebrate myoglobins. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2013; 1834:1832-9. [PMID: 23388387 DOI: 10.1016/j.bbapap.2013.01.037] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2012] [Revised: 01/23/2013] [Accepted: 01/26/2013] [Indexed: 02/06/2023]
Abstract
Recent years have witnessed a new round of research on one of the most studied proteins - myoglobin (Mb), the oxygen (O2) carrier of skeletal and heart muscle. Two major discoveries have stimulated research in this field: 1) that Mb has additional protecting functions, such as the regulation of in vivo levels of the signaling molecule nitric oxide (NO) by scavenging and generating NO during normoxia and hypoxia, respectively; and 2) that Mb in vertebrates (particularly fish) is expressed as tissue-specific isoforms in other tissues than heart and skeletal muscle, such as vessel endothelium, liver and brain, as found in cyprinid fish. Furthermore, Mb has also been found to protect against oxidative stress after hypoxia and reoxygenation and to undergo allosteric, O2-linked S-nitrosation, as in rainbow trout. Overall, the emerging evidence, particularly from fish species, indicates that Mb fulfills a broader array of physiological functions in a wider range of different tissues than hitherto appreciated. This new knowledge helps to better understand how variations in Mb structure and function may correlate with differences in animals' lifestyles and hypoxia-tolerance. This review integrates old and new results on Mb expression patterns and functional properties amongst vertebrates and discusses how these may relate to adaptive variations in different species. This article is part of a special issue entitled: Oxygen Binding and Sensing Proteins.
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Affiliation(s)
- Signe Helbo
- Department of Bioscience, Aarhus University, Denmark.
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Suppression of nitric oxide production on LPS/IFN-γ-stimulated RAW264.7 macrophages by a novel catechin, pilosanol N, from Agrimonia pilosa Ledeb. Bioorg Med Chem Lett 2012; 22:1766-9. [DOI: 10.1016/j.bmcl.2011.12.086] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Revised: 12/14/2011] [Accepted: 12/16/2011] [Indexed: 11/22/2022]
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12
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Taira J, Ohmine W, Ohmi N, Taira K, Nagata J. Nitric Oxide-scavenging Activity of Okinawan Sweet Potato (Ipomoea batatas L.) Leave Extracts. J JPN SOC FOOD SCI 2012. [DOI: 10.3136/nskkk.59.295] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Samuni Y, Flores-Santana W, Krishna MC, Mitchell JB, Wink DA. The inhibitors of histone deacetylase suberoylanilide hydroxamate and trichostatin A release nitric oxide upon oxidation. Free Radic Biol Med 2009; 47:419-23. [PMID: 19447172 PMCID: PMC2730666 DOI: 10.1016/j.freeradbiomed.2009.05.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 05/07/2009] [Accepted: 05/09/2009] [Indexed: 11/16/2022]
Abstract
Suberoylanilide hydroxamic acid (SAHA, vorinostat, Zolinza) is the lead compound of a new class of histone deacetylase (HDAC) inhibitors used as anticancer drugs that have been shown to affect multiple proteins associated with gene expression, cell proliferation, and migration. Studies have also demonstrated the essential role of the hydroxamate moiety of SAHA in HDAC inhibition. The ability of SAHA and its structural analog trichostatin A (TSA) to generate NO upon oxidation was tested directly, by spin trapping of NO using electron paramagnetic resonance spectroscopy, and also indirectly, via the determination of nitrite using the Griess assay. H2O2/metmyoglobin was used to oxidize SAHA and TSA. These studies demonstrate, for the first time, the release of NO from SAHA and its structural analog TSA. We tested the protective effects of SAHA, TSA, and valproic acid (VPA) in mammalian Chinese hamster V79 cells exposed to a bolus of H2O2 for 1 h and monitored the clonogenic cell survival. Both SAHA and TSA afforded significant cytoprotection when co-incubated with H2O2, whereas VPA was ineffective. These studies provide evidence for the release of NO by hydroxamate-containing HDAC inhibitors and their antioxidant effects. Such roles may be an added advantage of this class of HDAC agents used for epigenetic therapies in cancer.
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Affiliation(s)
- Yuval Samuni
- Radiation Biology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
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15
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Klink M, Sawierzko A, SuLowska Z. Nitric oxide generation from hydroxylamine in the presence of neutrophils and in the cell-free system. APMIS 2008. [DOI: 10.1111/j.1600-0463.2001.907802.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fernández ML, Estrin DA, Bari SE. Theoretical insight into the hydroxylamine oxidoreductase mechanism. J Inorg Biochem 2008; 102:1523-30. [PMID: 18336913 DOI: 10.1016/j.jinorgbio.2008.01.032] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Revised: 01/18/2008] [Accepted: 01/21/2008] [Indexed: 10/22/2022]
Abstract
The multiheme enzyme hydroxylamine oxidoreductase from the autotrophic bacteria Nitrosomonas europaea catalyzes the conversion of hydroxylamine to nitrite, with a complicate arrangement of heme groups in three subunits. As a distinctive feature, the protein has a covalent linkage between a tyrosyl residue of one subunit and a meso carbon atom of the heme active site of another. We studied the influence of this bond in the catalysis from a theoretical perspective through electronic structure calculations at the density functional theory level, starting from the crystal structure of the protein. Geometry optimizations of proposed reaction intermediates were used to calculate the dissociation energy of different nitrogen containing ligands, considering the presence and absence of the meso tyrosyl residue. The results indicate that the tyrosine residue enhances the binding of hydroxylamine, and increases the stability of a Fe(III)NO intermediate, while behaving indifferently in the Fe(II)NO form. The calculations performed on model systems including neighboring aminoacids revealed the probable formation of a bidentate hydrogen bond between the Fe(III)H(2)O complex and Asp 257, in a high-spin aquo complex as the resting state. Characterization of non-planar heme distortions showed that the meso-substituent induces significant ruffling in the evaluated intermediates.
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Affiliation(s)
- M Laura Fernández
- Departamento de Química Inorgánica, Analítica y Química Física/INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, C1428EHA, Argentina
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Gutiérrez MM, Alluisetti GB, Olabe JA, Amorebieta VT. Nitrosation of N-methylhydroxylamine by nitroprusside. A kinetic and mechanistic study. Dalton Trans 2008:5025-30. [DOI: 10.1039/b805329d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Vasil’tsov AM, Demenev AP, Mikhaleva AI, Sobenina LN, Vakul’skaya TI, Trofimov BA. N,N-dimethylhydroxylamine carbonate and oxalate as sources of N,N-dimethylaminoxyl radicals. DOKLADY CHEMISTRY 2007. [DOI: 10.1134/s0012500807080022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Vidrio H, Medina M. Hypotensive effect of hydroxylamine, an endogenous nitric oxide donor and SSAO inhibitor. J Neural Transm (Vienna) 2007; 114:863-5. [PMID: 17385063 DOI: 10.1007/s00702-007-0702-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2006] [Accepted: 10/13/2006] [Indexed: 10/23/2022]
Abstract
The endogenous compound hydroxylamine relaxes vascular smooth muscle in vitro, apparently through conversion to the vasodilator factor nitric oxide, but its effect on blood pressure has not been characterized. We found that in the anesthetized rat the amine elicits dose-related hypotension when administered by continuous iv infusion. In experiments designed to explore the mechanism of this effect, hydroxylamine was compared with the nitric oxide donor nitroprusside and the direct-acting vasodilator hydralazine, using pretreatments known to modify diverse mechanisms of vasodilation. Hydroxylamine hypotension was enhanced by the SSAO inhibitor isoniazid and the SSAO substrate methylamine, a pattern shared by hydralazine. Responses were blocked by the guanylate cyclase inhibitor methylene blue and were increased by the nitric oxide synthase inhibitor L-NAME, a pattern shared by nitroprusside. It was concluded that hydroxylamine exerts hypotension partly through conversion to nitric oxide and partly by a "hydralazine-like" mechanism involving SSAO inhibition.
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Affiliation(s)
- H Vidrio
- Department of Pharmacology, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico.
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Tang G, Wu L, Wang R. The effect of hydroxylamine on KATP channels in vascular smooth muscle and underlying mechanisms. Mol Pharmacol 2005; 67:1723-31. [PMID: 15716463 DOI: 10.1124/mol.104.008953] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Hydroxylamine (HA) is a putative intermediate in the conversion of l-arginine to nitric oxide (NO). HA was reported to cause the relaxation of precontracted aorta strips; however, the ionic mechanisms of HA-induced vasorelaxation were not yet known. In the present study, the whole-cell patch-clamp technique was used to examine the effects of HA on ATP-sensitive K+ (K(ATP)) currents and membrane potentials in vascular smooth muscle cells from rat mesenteric arteries and underlying mechanisms. It was found that bath-applied HA reversibly enhanced K(ATP) currents in a concentration-dependent fashion with an EC50 of 54 +/- 3.4 microM and hyperpolarized the cell membrane from -48 +/- 5.2 to -65 +/- 7.5 mV (n = 6, p < 0.01). The increase in K(ATP) currents induced by HA was suppressed by superoxide dismutase (-380 +/- 45 to -160 +/- 20 pA, n = 4, p < 0.01) and N-acetyl-L-cysteine (-385 +/- 55 to -150 +/- 16 pA, n = 5, p < 0.01), indicating the involvement of different free radicals, including superoxide anion. Hypoxanthine/xanthine oxidase increased not only basal K(ATP) currents, but also HA-enhanced K(ATP) currents (from -355 +/- 40 to -480 +/- 62 pA, n = 6, p < 0.05). Sodium nitroprusside, a spontaneous NO donor, and a membrane-permeable cGMP analog (8-bromo-cGMP) were without effects on HA-enhanced K(ATP) currents or basal K(ATP) currents. Our results indicate that HA augmented K(ATP) channel activity and hyperpolarized cell membrane, possibly via increased free radical generation.
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Affiliation(s)
- Guanghua Tang
- Department of Physiology, College of Medicine, University of Saskatchewan, Saskatoon, Canada
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Fradette C, Yamaguchi N, du Souich P. 5-Hydroxytryptamine is biotransformed by CYP2C9, 2C19 and 2B6 to hydroxylamine, which is converted into nitric oxide. Br J Pharmacol 2004; 141:407-14. [PMID: 14718257 PMCID: PMC1574215 DOI: 10.1038/sj.bjp.0705632] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
There is circumstantial evidence suggesting that 5-hydroxytryptamine (5-HT) could be biotransformed by enzymatic systems other than monoamino oxidase A, and that the isoforms of cytochrome P450 may be a source of nitric oxide. This study aimed to assess whether cytochrome P450 contributes to 5-HT biotransformation, and to provide evidence that 5-HT metabolism generates nitric oxide. Addition of 5-HT to cultured hepatocytes yielded 5-hydroxyindol acetic acid, a formation modulated by cytochrome P450 enzyme inducers and inhibitors. Recombinant human CYP2B6, 2C9 and 2C19 biotransformed 5-HT in 5-hydroxyindol acetic acid, but not CYP1A2, 2D6 or 3A4. Cultured hepatocytes with 5-HT generated nitric oxide, the amount of which was altered by cytochrome P450 enzyme inducers and inhibitors. In the presence of CYP2B6, 2C9 and 2C19, 5-HT relaxed precontracted isolated aortic rings, with or without endothelium, an effect prevented by the addition of methylene blue and an inhibitor of catalase, but not by myoglobin. In the absence of catalase, hydroxylamine was always assayed as a byproduct of 5-HT metabolism. In conclusion, CYP2B6, 2C9 and 2C19 biotransform 5-HT, yielding hydroxylamine, which is converted to nitric oxide in the presence of catalase. British Journal of Pharmacology (2004) 141, 407-414. doi:10.1038/sj.bjp.0705632
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Affiliation(s)
- Caroline Fradette
- Department of Pharmacology, Faculty of Medicine, University of Montréal, P.O. Box 6128, Stat. Centre-Ville, Montréal, Québec, Canada H3C 3J7
| | - Nobuharu Yamaguchi
- Faculty of Pharmacy, University of Montréal, P.O. Box 6128, Stat. Centre-Ville, Montréal, Québec, Canada H3C 3J7
| | - Patrick du Souich
- Department of Pharmacology, Faculty of Medicine, University of Montréal, P.O. Box 6128, Stat. Centre-Ville, Montréal, Québec, Canada H3C 3J7
- Author for correspondence:
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Affiliation(s)
- Jens K S Møller
- Food Chemistry, Department of Dairy and Food Science, Royal Veterinary and Agricultural University, Rolighedsvej 30, DK-1958 Frederiksberg C., Denmark
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Wang PG, Xian M, Tang X, Wu X, Wen Z, Cai T, Janczuk AJ. Nitric oxide donors: chemical activities and biological applications. Chem Rev 2002; 102:1091-134. [PMID: 11942788 DOI: 10.1021/cr000040l] [Citation(s) in RCA: 972] [Impact Index Per Article: 44.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Peng George Wang
- Department of Chemistry, Wayne State University, Detroit, Michigan 48202, USA.
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Taira J, Miyagi C, Aniya Y. Dimerumic acid as an antioxidant from the mold, Monascus anka: the inhibition mechanisms against lipid peroxidation and hemeprotein-mediated oxidation. Biochem Pharmacol 2002; 63:1019-26. [PMID: 11911855 DOI: 10.1016/s0006-2952(01)00923-6] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study aimed to investigate the antioxidant mechanism of dimerumic acid isolated as the active component with a radical scavenging action from the mold Monascus anka, traditionally used for the fermentation of foods. Dimerumic acid inhibited NADPH- and iron(II)-dependent lipid peroxidation (LPO) of rat liver microsomes at 20 and 200 microM, respectively. When ferrylmyoglobin was incubated with dimerumic acid, the myoglobin was scavenged and an electron spin resonance (ESR) signal with nine peaks was observed. The spin adduct was identified as a nitroxide radical by analysis of hyperfine structure. Similar ESR signal was also detected by incubation of dimerumic acid with peroxyl radicals. Thus, it was clarified that the antioxidant action of dimerumic acid is due to one electron donation of the hydroxamic acid group in the dimerumic acid molecule toward oxidants resulting in formation of nitroxide radical.
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Affiliation(s)
- Junsei Taira
- Okinawa Prefectural Institute of Health and Environment, Okinawa, Japan
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Liang JL, Huang JS, Zhou ZY, Cheung KK, Che CM. Interaction between dioxoruthenium(VI) porphyrins and hydroxylamines: coordination of N-substituted hydroxylamine to ruthenium and X-ray crystal structures of ruthenium complexes with a unidentate nitrosoarene ligand. Chemistry 2001; 7:2306-17. [PMID: 11446633 DOI: 10.1002/1521-3765(20010601)7:11<2306::aid-chem23060>3.0.co;2-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The interactions between dioxoruthenium(VI) porphyrins 1 with N-phenylhydroxylamine or unsubstituted hydroxylamine are described. Reaction of complexes 1 with excess PhNHOH leads to isolation of bis(nitrosobenzene)ruthenium(II) porphyrins 3 and mono(nitrosobenzene)ruthenium(II) porphyrins 4. Both the types of ruthenium complexes are characterized by 1H NMR, IR, and UV/Vis spectroscopy, and mass spectrometry. The X-ray structure determinations on [Ru(II)(TPP)(PhNO)2] (3a), [Ru(II)(2,6-Cl-TPP)(PhNO)2] (3e), and [Ru(II)(4-MeO-TPP)(PhNO)(PhNH2)] (4d) (TPP tetraarylporphyrin) disclose a unidentate nitrosoarene coordination in all these complexes, with Ru-N(PhNO) bond lengths of 2.003(3) (3a, average), 1.991(3) (3e, average), and 2.042(2) A (4d). In the case of 4d, the Ru-N(PhNH2) bond length is found to be 2.075(3) A. Mechanistic investigations reveal the formation of intermediates [Ru(II)(Por)(PhNO)(PhNHOH)] (5; Por=porphyrin), a ruthenium complex with N-substituted hydroxylamine ligand, in the "1 + PhNHOH" system. The Ru-NH(OH)Ph moiety in 5 undergoes no rapid exchange with free PhNHOH in solution at room temperature, as revealed by 1H NMR spectroscopy. Unlike the interaction between complexes 1 and PhNHOH, reaction of such complexes with NH2OH affords nitrosylruthenium(II) porphyrins [Ru(II)(Por)(NO)(OH)] (6).
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Affiliation(s)
- J L Liang
- Department of Chemistry, The University of Hong Kong.
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Même W, Léoty C. Changes in voltage activation of contraction in frog skeletal muscle fibres as a result of sarcoplasmic reticulum Ca2+-ATPase activity. ACTA PHYSIOLOGICA SCANDINAVICA 1999; 166:209-16. [PMID: 10468657 DOI: 10.1046/j.1365-201x.1999.00551.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The effects of cyclopiazonic acid, a specific sarcoplasmic reticulum Ca2+-ATPase inhibitor, on isometric tension were studied in response to prolonged steady-state depolarization induced by a rapid change in extracellular potassium concentration (potassium contractures) in frog semitendinosus muscle fibres. Cyclopiazonic acid (1-10 microM) enhanced the amplitude and time-course of relaxation of 146 mM potassium contracture. In the presence of cyclopiazonic acid 0.5 microM, the relationship between the amplitude of potassium contractures and the membrane potential shifted to more negative potentials, whereas the steady-state inactivation curve was unchanged. These observations suggest that cyclopiazonic acid has no effect on voltage sensors. The difference between potassium contractures in the absence and presence of cyclopiazonic acid in skeletal muscle fibres implies that the amplitude and slow relaxation of tension during prolonged steady-state depolarization may be expected to depend not only on inactivation of the process regulating calcium release from the sarcoplasmic reticulum but also on the ability of the sarcoplasmic reticulum to pump calcium.
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Affiliation(s)
- W Même
- Laboratoire de Physiologie Générale, CNRS EP1593, Faculté des Sciences et des Techniques, 2 Rue de la Houssinière, Nantes Cedex 3, France
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