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Assayag M, Goldstein S, Samuni A, Kaufman A, Berkman N. The nitroxide/antioxidant 3-carbamoyl proxyl attenuates disease severity in murine models of severe asthma. Free Radic Biol Med 2021; 177:181-188. [PMID: 34678420 DOI: 10.1016/j.freeradbiomed.2021.10.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/14/2021] [Accepted: 10/18/2021] [Indexed: 11/19/2022]
Abstract
Asthma is characterized by airway inflammation, hyper-responsiveness, symptoms of dyspnea, wheezing and coughing. In most patients, asthma is well controlled using inhaled corticosteroids and bronchodilators. A minority of patients with asthma develop severe disease, which is frequently only partially responsive or even resistant to treatment with corticosteroids. Severe refractory asthma is associated with structural changes in the airways, termed "airway remodeling", and/or with neutrophilic rather than eosinophilic airway inflammation. While oxidative stress plays an important role in the pathophysiology of asthma, cyclic nitroxide stable radicals, which are unique and efficient catalytic antioxidants, effectively protect against oxidative injury. We have demonstrated that the nitroxide 3-carbamoyl proxyl (3-CP) attenuates airway inflammation and hyperresponsiveness in allergic asthma as well as bleomycin-induced fibrosis both using murine models, most probably through modulation of oxidative stress. The present study evaluates the effect of 3-CP on airway inflammation and remodeling using two murine models of severe asthma where mice are sensitized and challenged either by ovalbumin (OVA) or by house dust mite (HDM). 3-CP was orally administered during the entire period of the experiment or during the challenge period alone where its effect was compared to that of dexamethasone. The induced increase by OVA and by HDM of BALf cell counts, airway hyperresponsiveness, fibrosis, transforming growth factor-beta (TGF-β) levels in BALf and protein nitration levels of the lung tissue was significantly reduced by 3-CP. The effect of 3-CP, using two different murine models of severe asthma, is associated at least partially with attenuation of oxidative stress and with TGF-β expression in the lungs. The results of this study suggest a potential use of 3-CP as a novel therapeutic agent in different forms of severe asthma.
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Affiliation(s)
- Miri Assayag
- Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Sara Goldstein
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
| | - Amram Samuni
- Institute of Medical Research, Israel-Canada Medical School, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Alexander Kaufman
- Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
| | - Neville Berkman
- Institute of Pulmonary Medicine, Hadassah-Hebrew University Medical Center, Jerusalem, 91120, Israel
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Assayag M, Goldstein S, Samuni A, Berkman N. 3-Carbamoyl-proxyl nitroxide radicals attenuate bleomycin-induced pulmonary fibrosis in mice. Free Radic Biol Med 2021; 171:135-142. [PMID: 33989760 DOI: 10.1016/j.freeradbiomed.2021.05.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/05/2021] [Accepted: 05/06/2021] [Indexed: 12/31/2022]
Abstract
Idiopathic pulmonary fibrosis (IPF) is a fatal interstitial lung disease with a poor prognosis and limited treatment options. Oxidative and nitrosative stress is implicated as one of the main pathogenic pathways in IPF. The rationale for the use of antioxidants to treat lung fibrosis is appealing, however to date a consistent beneficial effect for such an approach has not been observed. We have recently demonstrated that nitroxides, particularly 3-carbamoyl-proxyl (3-CP), markedly reduce airway inflammation, airway hyper-responsiveness, and protein nitration of the lung tissue in a mouse model of ovalbumin-induced acute asthma, thus prompting its use for the treatment of IPF. The present study investigates the effect of 3-CP on the development of lung fibrosis using the murine intratracheal bleomycin model. 3-CP was administered either intranasally or orally during the entire experiment or starting 7 days after induction of the lung injury. 3-CP was found to be both a preventive and a therapeutic drug reducing the lung fibrosis (histological score), the increase in collagen content, protein nitration, TGF-β levels, the degree of weight loss as well as inhibiting the impairment of lung function. Nitroxides are catalytic antioxidants that preferentially detoxify radicals, and therefore the effect of 3-CP on the severity of the disease supports the involvement of reactive oxygen and nitrogen species in the disease pathology.
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Affiliation(s)
- Miri Assayag
- Institute of Pulmonary Medicine, Hadassah Medical Center and Faculty of Medicine, Israel
| | - Sara Goldstein
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel.
| | - Amram Samuni
- Institute of Medical Research, Israel-Canada Medical School, The Hebrew University of Jerusalem, Jerusalem, 91120, Israel
| | - Neville Berkman
- Institute of Pulmonary Medicine, Hadassah Medical Center and Faculty of Medicine, Israel
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Michl TD, Tran DTT, Kuckling HF, Zhalgasbaikyzy A, Ivanovská B, González García LE, Visalakshan RM, Vasilev K. It takes two for chronic wounds to heal: dispersing bacterial biofilm and modulating inflammation with dual action plasma coatings. RSC Adv 2020; 10:7368-7376. [PMID: 35492196 PMCID: PMC9049834 DOI: 10.1039/c9ra09875e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 02/06/2020] [Indexed: 11/21/2022] Open
Abstract
Chronic wounds are affecting increasingly larger portions of the general population and their treatment has essentially remained unchanged for the past century. This lack of progress is due to the complex problem that chronic wounds are simultaneously infected and inflamed. Both aspects need to be addressed together to achieve a better healing outcome. Hence, we hereby demonstrate that the stable nitroxide radical (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) can be plasma polymerized into smooth coatings (TEMPOpp), as seen via atomic force microscopy, X-ray photoelectron spectroscopy and ellipsometry. Upon contact with water, these coatings leach nitroxides into aqueous supernatant, as measured via EPR. We then exploited the known cell-signalling qualities of TEMPO to change the cellular behaviour of bacteria and human cells that come into contact with the surfaces. Specifically, the TEMPOpp coatings not only suppressed biofilm formation of the opportunistic bacterium Staphylococcus epidermidis but also dispersed already formed biofilm in a dose-dependent manner; a crucial aspect in treating chronic wounds that contain bacterial biofilm. Thus the coatings' microbiological efficacy correlated with their thickness and the thickest coating was the most efficient. Furthermore, this dose-dependent effect was mirrored in significant cytokine reduction of activated THP-1 macrophages for the four cytokines TNF-α, IL-1β, IL-6 and IP-10. At the same time, the THP-1 cells retained their ability to adhere and colonize the surfaces, as verified via SEM imaging. Thus, summarily, we have exploited the unique qualities of plasma polymerized TEMPO coatings in targeting both infection and inflammation simultaneously; demonstrating a novel alternative to how chronic wounds could be treated in the future. We plasma polymerized the stable nitroxide radical TEMPO into thin coatings and exploited the coatings' unique qualities in targeting both infection and inflammation simultaneously; demonstrating a novel alternative as to how chronic wounds could be treated in the future.![]()
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Affiliation(s)
| | | | | | | | - Barbora Ivanovská
- School of Engineering
- University of South Australia
- Mawson Lakes
- Australia
| | | | | | - Krasimir Vasilev
- School of Engineering
- University of South Australia
- Mawson Lakes
- Australia
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Maimon E, Samuni A, Goldstein S. Mechanistic insight into the catalytic inhibition by nitroxides of tyrosine oxidation and nitration. Biochim Biophys Acta Gen Subj 2019; 1863:129403. [PMID: 31356821 DOI: 10.1016/j.bbagen.2019.07.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 07/03/2019] [Accepted: 07/24/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND Nitroxide antioxidants (RNO•) protect from injuries associated with oxidative stress. Tyrosine residues in proteins are major targets for oxidizing species giving rise to irreversible cross-linking and protein nitration, but the mechanisms underlying the protective activity of RNO• on these processes are not sufficiently clear. METHODS Tyrosine oxidation by the oxoammonium cation (RN+=O) was studied by following the kinetics of RNO• formation using EPR spectroscopy. Tyrosine oxidation and nitration were investigated using the peroxidase/H2O2 system without and with nitrite. The inhibitory effect of RNO• on these processes was studied by following the kinetics of the evolved O2 and accumulation of tyrosine oxidation and nitration products. RESULTS Tyrosine ion is readily oxidized by RN+=O, and the equilibrium constant of this reaction depends on RNO• structure and reduction potential. RNO• catalytically inhibits tyrosine oxidation and nitration since it scavenges both tyrosyl and •NO2 radicals while recycling through RN+=O reduction by H2O2, tyrosine and nitrite. The inhibitory effect of nitroxide on tyrosine oxidation and nitration increases as its reduction potential decreases where the 6-membered ring nitroxides are better catalysts than the 5-membered ones. CONCLUSIONS Nitroxides catalytically inhibit tyrosine oxidation and nitration. The proposed reaction mechanism adequately fits the results explaining the dependence of the nitroxide inhibitory effect on its reduction potential and on the concentrations of the reducing species present in the system. GENERAL SIGNIFICANCE Nitroxides protect against both oxidative and nitrative damage. The proposed reaction mechanism further emphasizes the role of the reducing environment to the efficacy of these catalysts.
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Affiliation(s)
- Eric Maimon
- Nuclear Research Centre Negev and Chemistry Department, Ben-Gurion University, Beer-Sheva 84105, Israel
| | - Amram Samuni
- Institute of Medical Research, Israel-Canada Medical School, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Sara Goldstein
- Institute of Chemistry, The Accelerator Laboratory, the Hebrew University of Jerusalem, Jerusalem 91904, Israel.
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Studying mechanism of radical reactions: From radiation to nitroxides as research tools. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2017.07.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
Allergic asthma refers to a chronic reversible bronchoconstriction influenced by an allergic trigger, leading to symptoms of cough, wheezing, shortness of breath, and chest tightness. Allergic bronchopulmonary aspergillosis is a complex hypersensitivity reaction, often in patients with asthma or cystic fibrosis, occurring when bronchi become colonized by Aspergillus species. The clinical picture is dominated by asthma complicated by recurrent episodes of bronchial obstruction, fever, malaise, mucus production, and peripheral blood eosinophilia. Hypersensitivity pneumonitis is a syndrome associated with lung inflammation from the inhalation of airborne antigens, such as molds and dust.
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Affiliation(s)
- Jason Raymond Woloski
- Department of Family Medicine, Penn State Hershey Medical Center, 500 University Drive, H154, PO Box 850, Hershey, PA 17033-0850, USA.
| | - Skye Heston
- Department of Family Medicine, Penn State Hershey Medical Center, 500 University Drive, H154, PO Box 850, Hershey, PA 17033-0850, USA
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Samuni A, Maimon E, Goldstein S. Nitroxides catalytically inhibit nitrite oxidation and heme inactivation induced by H 2O 2, nitrite and metmyoglobin or methemoglobin. Free Radic Biol Med 2016; 101:491-499. [PMID: 27826125 DOI: 10.1016/j.freeradbiomed.2016.10.534] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 10/22/2016] [Accepted: 10/25/2016] [Indexed: 11/18/2022]
Abstract
Stable nitroxide radicals have multiple biological effects, although the mechanisms underlying them are not fully understood. Their protective effect against oxidative damage has been mainly attributed to scavenging deleterious radicals, oxidizing reduced metal ions and reducing oxyferryl centers of heme proteins. Yet, the potential of nitroxides to protect heme proteins against inactivation while suppressing or enhancing their catalytic activities has been largely overlooked. We have studied the effect of nitroxides, including TPO (2,2,6,6-tetramethylpiperidin-N-oxyl), 4-OH-TPO, 4-oxo-TPO and 3-carbamoyl proxyl, on the peroxidase-like activity of metmyoglobin (MbFeIII) and methemoglobin (HbFeIII) using nitrite as an electron donor by following heme absorption, H2O2 consumption, O2 evolution and nitrite oxidation. The results demonstrate that the peroxidase-like activity is accompanied by a progressive heme inactivation where MbFeIII is far more resistant than HbFeIII. Nitroxides convert the peroxidase-like activity into catalase-like activity while inhibiting heme inactivation and nitrite oxidation in a dose-dependent manner. The nitroxide facilitates H2O2 dismutation, yet none of its reactions with any of the intermediates formed in these systems is rate-determining, and therefore its effect on the rate of the catalysis is hardly dependent on the kind of the nitroxide derivative and its concentration. The nitroxide at µM concentrations range catalytically inhibits nitrite oxidation, and consequently prevents tyrosine nitration induced by heme protein/H2O2/nitrite due to its fast oxidation by •NO2 forming the respective oxoammonium cation, which is reduced back to the nitroxide by H2O2 and by superoxide radical. The nitroxides are superior over common antioxidants, which their reaction with •NO2 always yields secondary radicals leading eventually to consumption of the antioxidant. A mechanism is proposed, and the kinetic simulations fit very well the experimental data in the case of MbFeIII where most of the rate constants of the reactions involved are independently known.
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Affiliation(s)
- Amram Samuni
- Institute of Medical Research, Israel-Canada Medical School, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Eric Maimon
- Nuclear Research Centre Negev, Beer Sheva, Israel
| | - Sara Goldstein
- Institute of Chemistry, The Accelerator Laboratory, the Hebrew University of Jerusalem, Jerusalem 91904, Israel.
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Adebisi A, Booysen IN, Akerman MP, Xulu B. Ruthenium complexes with lumazine derivatives: structural, electrochemical, computational and radical scavenging studies. TRANSIT METAL CHEM 2016. [DOI: 10.1007/s11243-016-0062-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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