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Halliwell B, Watt F, Minqin R. Iron and atherosclerosis: Lessons learned from rabbits relevant to human disease. Free Radic Biol Med 2023; 209:165-170. [PMID: 37852545 DOI: 10.1016/j.freeradbiomed.2023.10.383] [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: 08/22/2023] [Revised: 10/02/2023] [Accepted: 10/10/2023] [Indexed: 10/20/2023]
Abstract
The role of iron in promoting atherosclerosis, and hence the cardiovascular, neurodegenerative and other diseases that result from atherosclerosis, has been fiercely controversial. Many studies have been carried out on various rodent models of atherosclerosis, especially on apoE-knockout (apoE-/-) mice, which develop atherosclerosis more readily than normal mice. These apoE-/- mouse studies generally support a role for iron in atherosclerosis development, although there are conflicting results. The purpose of the current article is to describe studies on another animal model that is not genetically manipulated; New Zealand White (NZW) rabbits fed a high-cholesterol diet. This may be a better model than the apoE-/- mice for human atherosclerosis, although it has been given much less attention. Studies on NZW rabbits support the view that iron promotes atherosclerosis, although some uncertainties remain, which need to be resolved by further experimentation.
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Affiliation(s)
- Barry Halliwell
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Neurobiology Research Programme, National University of Singapore, Centre for Life Sciences, #05-01A, 28 Medical Drive, 117456, Singapore.
| | - Frank Watt
- Department of Physics, National University of Singapore, Faculty of Science, 2 Science Drive 3, Blk S12, Level 2, 117551, Singapore.
| | - Ren Minqin
- Department of Physics, National University of Singapore, Faculty of Science, 2 Science Drive 3, Blk S12, Level 2, 117551, Singapore.
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2
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Lopez-Blazquez C, Lacalle-Gonzalez C, Sanz-Criado L, Ochieng’ Otieno M, Garcia-Foncillas J, Martinez-Useros J. Iron-Dependent Cell Death: A New Treatment Approach against Pancreatic Ductal Adenocarcinoma. Int J Mol Sci 2023; 24:14979. [PMID: 37834426 PMCID: PMC10573128 DOI: 10.3390/ijms241914979] [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: 08/14/2023] [Revised: 10/02/2023] [Accepted: 10/05/2023] [Indexed: 10/15/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is a devastating tumor type where a very high proportion of people diagnosed end up dying from cancer. Surgical resection is an option for only about 20% of patients, where the 5-year survival increase ranges from 10 to 25%. In addition to surgical resection, there are adjuvant chemotherapy schemes, such as FOLFIRINOX (a mix of Irinotecan, oxaliplatin, 5-Fluorouraci and leucovorin) or gemcitabine-based treatment. These last two drugs have been compared in the NAPOLI-3 clinical trial, and the NALIRIFOX arm was found to have a higher overall survival (OS) (11.1 months vs. 9.2 months). Despite these exciting improvements, PDAC still has no effective treatment. An interesting approach would be to drive ferroptosis in PDAC cells. A non-apoptotic reactive oxygen species (ROS)-dependent cell death, ferroptosis was first described by Dixon et al. in 2012. ROS are constantly produced in the tumor cell due to high cell metabolism, which is even higher when exposed to chemotherapy. Tumor cells have detoxifying mechanisms, such as Mn-SOD or the GSH-GPX system. However, when a threshold of ROS is exceeded in the tumor cell, the cell's antioxidant systems are overwhelmed, resulting in lipid peroxidation and, ultimately, ferroptosis. In this review, we point out ferroptosis as an approach to consider in PDAC and propose that altering the cellular ROS balance by combining oxidizing agents or with inhibitors of the main cellular detoxifiers triggers ferroptosis in PDAC.
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Affiliation(s)
- Carlos Lopez-Blazquez
- Translational Oncology Division, OncoHealth Institute, Health Research Institute—Fundación Jimenéz Diaz, Fundación Jimenéz Díaz University Hospital/Universidad Autónoma de Madrid (IIS-FJD/UAM), 28040 Madrid, Spain; (C.L.-B.); (L.S.-C.)
| | - Carlos Lacalle-Gonzalez
- Department of Medical Oncology, Fundación Jiménez Díaz University Hospital, 28040 Madrid, Spain;
| | - Lara Sanz-Criado
- Translational Oncology Division, OncoHealth Institute, Health Research Institute—Fundación Jimenéz Diaz, Fundación Jimenéz Díaz University Hospital/Universidad Autónoma de Madrid (IIS-FJD/UAM), 28040 Madrid, Spain; (C.L.-B.); (L.S.-C.)
| | - Michael Ochieng’ Otieno
- Translational Oncology Division, OncoHealth Institute, Health Research Institute—Fundación Jimenéz Diaz, Fundación Jimenéz Díaz University Hospital/Universidad Autónoma de Madrid (IIS-FJD/UAM), 28040 Madrid, Spain; (C.L.-B.); (L.S.-C.)
| | - Jesus Garcia-Foncillas
- Department of Medical Oncology, Fundación Jiménez Díaz University Hospital, 28040 Madrid, Spain;
| | - Javier Martinez-Useros
- Translational Oncology Division, OncoHealth Institute, Health Research Institute—Fundación Jimenéz Diaz, Fundación Jimenéz Díaz University Hospital/Universidad Autónoma de Madrid (IIS-FJD/UAM), 28040 Madrid, Spain; (C.L.-B.); (L.S.-C.)
- Area of Physiology, Department of Basic Health Sciences, Faculty of Health Sciences, Rey Juan Carlos University, 28922 Madrid, Spain
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3
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Beale AD, Hayter EA, Crosby P, Valekunja UK, Edgar RS, Chesham JE, Maywood ES, Labeed FH, Reddy AB, Wright KP, Lilley KS, Bechtold DA, Hastings MH, O'Neill JS. Mechanisms and physiological function of daily haemoglobin oxidation rhythms in red blood cells. EMBO J 2023; 42:e114164. [PMID: 37554073 PMCID: PMC10548169 DOI: 10.15252/embj.2023114164] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/16/2023] [Accepted: 07/16/2023] [Indexed: 08/10/2023] Open
Abstract
Cellular circadian rhythms confer temporal organisation upon physiology that is fundamental to human health. Rhythms are present in red blood cells (RBCs), the most abundant cell type in the body, but their physiological function is poorly understood. Here, we present a novel biochemical assay for haemoglobin (Hb) oxidation status which relies on a redox-sensitive covalent haem-Hb linkage that forms during SDS-mediated cell lysis. Formation of this linkage is lowest when ferrous Hb is oxidised, in the form of ferric metHb. Daily haemoglobin oxidation rhythms are observed in mouse and human RBCs cultured in vitro, or taken from humans in vivo, and are unaffected by mutations that affect circadian rhythms in nucleated cells. These rhythms correlate with daily rhythms in core body temperature, with temperature lowest when metHb levels are highest. Raising metHb levels with dietary sodium nitrite can further decrease daytime core body temperature in mice via nitric oxide (NO) signalling. These results extend our molecular understanding of RBC circadian rhythms and suggest they contribute to the regulation of body temperature.
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Affiliation(s)
| | - Edward A Hayter
- Centre for Biological Timing, Faculty of Biology, Medicine and HealthUniversity of ManchesterManchesterUK
| | - Priya Crosby
- MRC Laboratory of Molecular BiologyCambridgeUK
- Present address:
Department of Chemistry and BiochemistryUniversity of California, Santa CruzSanta CruzCAUSA
| | - Utham K Valekunja
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
- Institute for Translational Medicine and Therapeutics, Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Rachel S Edgar
- Department of Infectious DiseasesImperial College LondonLondonUK
| | | | | | - Fatima H Labeed
- Faculty of Engineering and Physical SciencesUniversity of SurreyGuildfordUK
| | - Akhilesh B Reddy
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
- Institute for Translational Medicine and Therapeutics, Perelman School of MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - Kenneth P Wright
- Department of Integrative Physiology, Sleep and Chronobiology LaboratoryUniversity of Colorado BoulderBoulderCOUSA
| | - Kathryn S Lilley
- Cambridge Centre for Proteomics, Department of BiochemistryUniversity of CambridgeCambridgeUK
| | - David A Bechtold
- Centre for Biological Timing, Faculty of Biology, Medicine and HealthUniversity of ManchesterManchesterUK
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4
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Nasir NJM, Heemskerk H, Jenkins J, Hamadee NH, Bunte R, Tucker-Kellogg L. Myoglobin-derived iron causes wound enlargement and impaired regeneration in pressure injuries of muscle. eLife 2023; 12:85633. [PMID: 37267120 DOI: 10.7554/elife.85633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 04/25/2023] [Indexed: 06/04/2023] Open
Abstract
The reasons for poor healing of pressure injuries are poorly understood. Vascular ulcers are worsened by extracellular release of hemoglobin, so we examined the impact of myoglobin (Mb) iron in murine muscle pressure injuries (mPI). Tests used Mb-knockout or treatment with deferoxamine iron chelator (DFO). Unlike acute injuries from cardiotoxin, mPI regenerated poorly with a lack of viable immune cells, persistence of dead tissue (necro-slough), and abnormal deposition of iron. However, Mb-knockout or DFO-treated mPI displayed a reversal of the pathology: decreased tissue death, decreased iron deposition, decrease in markers of oxidative damage, and higher numbers of intact immune cells. Subsequently, DFO treatment improved myofiber regeneration and morphology. We conclude that myoglobin iron contributes to tissue death in mPI. Remarkably, a large fraction of muscle death in untreated mPI occurred later than, and was preventable by, DFO treatment, even though treatment started 12 hr after pressure was removed. This demonstrates an opportunity for post-pressure prevention to salvage tissue viability.
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Affiliation(s)
- Nurul Jannah Mohamed Nasir
- Cancer & Stem Cell Biology, Duke-NUS Medical School, Singapore, Singapore
- Centre for Computational Biology, Duke-NUS Medical School, Singapore, Singapore
| | - Hans Heemskerk
- Cancer & Stem Cell Biology, Duke-NUS Medical School, Singapore, Singapore
- BioSyM and CAMP Interdisciplinary Research Group, Singapore-MIT Alliance for Research and Technology, CREATE, Singapore, Singapore
| | - Julia Jenkins
- Cancer & Stem Cell Biology, Duke-NUS Medical School, Singapore, Singapore
| | | | - Ralph Bunte
- Cancer & Stem Cell Biology, Duke-NUS Medical School, Singapore, Singapore
| | - Lisa Tucker-Kellogg
- Cancer & Stem Cell Biology, Duke-NUS Medical School, Singapore, Singapore
- Centre for Computational Biology, Duke-NUS Medical School, Singapore, Singapore
- BioSyM and CAMP Interdisciplinary Research Group, Singapore-MIT Alliance for Research and Technology, CREATE, Singapore, Singapore
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Ahmed NM, Lotfallah AH, Gaballah MS, Awad SM, Soltan MK. Novel 2-Thiouracil-5-Sulfonamide Derivatives: Design, Synthesis, Molecular Docking, and Biological Evaluation as Antioxidants with 15-LOX Inhibition. Molecules 2023; 28:molecules28041925. [PMID: 36838913 PMCID: PMC9963659 DOI: 10.3390/molecules28041925] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 02/15/2023] [Accepted: 02/15/2023] [Indexed: 02/22/2023] Open
Abstract
New antioxidant agents are urgently required to combat oxidative stress, which is linked to the emergence of serious diseases. In an effort to discover potent antioxidant agents, a novel series of 2-thiouracil-5-sulfonamides (4-9) were designed and synthesized. In line with this approach, our target new compounds were prepared from methyl ketone derivative 3, which was used as a blocking unit for further synthesis of a novel series of chalcone derivatives 4a-d, thiosemicarbazone derivatives 5a-d, pyridine derivatives 6a-d and 7a-d, bromo acetyl derivative 8, and thiazole derivatives 9a-d. All compounds were evaluated as antioxidants against 2,2-diphenyl-1-picrylhydrazyl (DPPH), hydrogen peroxide (H2O2), lipid peroxidation, and 15-lipoxygenase (15-LOX) inhibition activity. Compounds 5c, 6d, 7d, 9b, 9c, and 9d demonstrated significant RSA in all three techniques in comparison with ascorbic acid and 15-LOX inhibitory effectiveness using quercetin as a standard. Molecular docking of compound 9b endorsed its proper binding at the active site pocket of the human 15-LOX which explains its potent antioxidant activity in comparison with standard ascorbic acid.
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Affiliation(s)
- Naglaa M. Ahmed
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Helwan University, Ein Helwan, Cairo 11795, Egypt
- Correspondence: or ; Tel.: +20-012-4228559 or Tel./Fax: +20-202-5541601
| | - Ahmed H. Lotfallah
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Sinai University, El-Arish 16020, Egypt
| | - Mohamed S. Gaballah
- Biochemistry Department, Faculty of Pharmacy, Helwan University, Ein Helwan, Cairo 11795, Egypt
| | - Samir M. Awad
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Helwan University, Ein Helwan, Cairo 11795, Egypt
| | - Moustafa K. Soltan
- Ministry of Health, Oman College of Health Sciences, Muscat 132, Oman
- Medicinal Chemistry Department, Faculty of Pharmacy, Zagazig University, Zagazig 44519, Egypt
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Gáll T, Nagy P, Garai D, Potor L, Balla GJ, Balla G, Balla J. Overview on hydrogen sulfide-mediated suppression of vascular calcification and hemoglobin/heme-mediated vascular damage in atherosclerosis. Redox Biol 2022; 57:102504. [PMID: 36240620 PMCID: PMC9576974 DOI: 10.1016/j.redox.2022.102504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 10/06/2022] [Accepted: 10/07/2022] [Indexed: 12/04/2022] Open
Abstract
Vulnerable atherosclerotic plaques with hemorrhage considerably contribute to cardiovascular morbidity and mortality. Calcification is the main characteristic of advanced atherosclerotic lesions and calcified aortic valve disease (CAVD). Lyses of red blood cells and hemoglobin (Hb) release occur in human hemorrhagic complicated lesions. During the interaction of cell-free Hb with plaque constituents, Hb is oxidized to ferric and ferryl states accompanied by oxidative changes of the globin moieties and heme release. Accumulation of both ferryl-Hb and metHb has been observed in atherosclerotic plaques. The oxidation hotspots in the globin chain are the cysteine and tyrosine amino acids associated with the generation of Hb dimers, tetramers and polymers. Moreover, fragmentation of Hb occurs leading to the formation of globin-derived peptides. A series of these pro-atherogenic cellular responses can be suppressed by hydrogen sulfide (H2S). Since H2S has been explored to exhibit a wide range of physiologic functions to maintain vascular homeostasis, it is not surprising that H2S may play beneficial effects in the progression of atherosclerosis. In the present review, we summarize the findings about the effects of H2S on atherosclerosis and CAVD with a special emphasis on the oxidation of Hb/heme in atherosclerotic plaque development and vascular calcification.
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Affiliation(s)
- Tamás Gáll
- Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Hungary; ELKH-UD Vascular Pathophysiology Research Group, 11003, University of Debrecen, Hungary; Kálmán Laki Doctoral School, University of Debrecen, Debrecen, Hungary
| | - Péter Nagy
- Department of Molecular Immunology and Toxicology, National Institute of Oncology, Budapest, Hungary; Institute of Oncochemistry, University of Debrecen, Hungary
| | - Dorottya Garai
- Department of Molecular Immunology and Toxicology, National Institute of Oncology, Budapest, Hungary
| | - László Potor
- Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Hungary; ELKH-UD Vascular Pathophysiology Research Group, 11003, University of Debrecen, Hungary; Kálmán Laki Doctoral School, University of Debrecen, Debrecen, Hungary
| | | | - György Balla
- Department of Pediatrics, Faculty of Medicine, University of Debrecen, Hungary; ELKH-UD Vascular Pathophysiology Research Group, 11003, University of Debrecen, Hungary; Kálmán Laki Doctoral School, University of Debrecen, Debrecen, Hungary
| | - József Balla
- Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, University of Debrecen, Hungary; ELKH-UD Vascular Pathophysiology Research Group, 11003, University of Debrecen, Hungary; Kálmán Laki Doctoral School, University of Debrecen, Debrecen, Hungary.
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7
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Radiolysis Studies of Oxidation and Nitration of Tyrosine and Some Other Biological Targets by Peroxynitrite-Derived Radicals. Int J Mol Sci 2022; 23:ijms23031797. [PMID: 35163717 PMCID: PMC8836854 DOI: 10.3390/ijms23031797] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 01/31/2022] [Accepted: 02/02/2022] [Indexed: 01/27/2023] Open
Abstract
The widespread interest in free radicals in biology extends far beyond the effects of ionizing radiation, with recent attention largely focusing on reactions of free radicals derived from peroxynitrite (i.e., hydroxyl, nitrogen dioxide, and carbonate radicals). These radicals can easily be generated individually by reactions of radiolytically-produced radicals in aqueous solutions and their reactions can be monitored either in real time or by analysis of products. This review first describes the general principles of selective radical generation by radiolysis, the yields of individual species, the advantages and limitations of either pulsed or continuous radiolysis, and the quantitation of oxidizing power of radicals by electrode potentials. Some key reactions of peroxynitrite-derived radicals with potential biological targets are then discussed, including the characterization of reactions of tyrosine with a model alkoxyl radical, reactions of tyrosyl radicals with nitric oxide, and routes to nitrotyrosine formation. This is followed by a brief outline of studies involving the reactions of peroxynitrite-derived radicals with lipoic acid/dihydrolipoic acid, hydrogen sulphide, and the metal chelator desferrioxamine. For biological diagnostic probes such as ‘spin traps’ to be used with confidence, their reactivities with radical species have to be characterized, and the application of radiolysis methods in this context is also illustrated.
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Wilson MT, Reeder BJ. The peroxidatic activities of Myoglobin and Hemoglobin, their pathological consequences and possible medical interventions. Mol Aspects Med 2021; 84:101045. [PMID: 34654576 PMCID: PMC8837633 DOI: 10.1016/j.mam.2021.101045] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 09/30/2021] [Indexed: 11/30/2022]
Abstract
Under those pathological conditions in which Myoglobin and Hemoglobin escape their cellular environments and are thus separated from cellular reductive/protective systems, the inherent peroxidase activities of these proteins can be expressed. This activity leads to the formation of the highly oxidizing oxo-ferryl species. Evidence that this happens in vivo is provided by the formation of a covalent bond between the heme group and the protein and this acts as an unambiguous biomarker for the presence of the oxo ferryl form. The peroxidatic activity also leads to the oxidation of lipids, the products of which can be powerful vasoconstrictive agents (e.g. isoprostanes, neuroprostanes). Here we review the evidence that lipid oxidation occurs following rhabdomyolysis and sub-arachnoid hemorrhage and that the products formed from arachidonic acid chains of phospholipids lead, through vasoconstriction, to kidney failure and brain vasospasm. Intervention in these pathological conditions through administration of reducing agents to remove ferryl heme is discussed. Through-protein electron transfer pathways that facilitate ferryl reduction at low reductant concentration have been identified. We conclude with consideration of the therapeutic use of Hemoglobin Based Oxygen carriers and how the toxicity of these may be reduced by engineering such electron transfer pathways into hemoglobin.
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Affiliation(s)
- Michael T Wilson
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester, Essex, CO4 3SQ, UK.
| | - Brandon J Reeder
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester, Essex, CO4 3SQ, UK.
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Mohiuddin M, Kasahara K. The emerging role of oxidative stress in complications of COVID-19 and potential therapeutic approach to diminish oxidative stress. Respir Med 2021; 187:106605. [PMID: 34507024 PMCID: PMC8420129 DOI: 10.1016/j.rmed.2021.106605] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 09/03/2021] [Indexed: 01/20/2023]
Affiliation(s)
- Md Mohiuddin
- Department of Respiratory Medicine, Kanazawa University, Ishikawa, Japan.
| | - Kazuo Kasahara
- Department of Respiratory Medicine, Kanazawa University, Ishikawa, Japan
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Yang J, He Y, Li Y, Zhang X, Wong YK, Shen S, Zhong T, Zhang J, Liu Q, Wang J. Advances in the research on the targets of anti-malaria actions of artemisinin. Pharmacol Ther 2020; 216:107697. [PMID: 33035577 PMCID: PMC7537645 DOI: 10.1016/j.pharmthera.2020.107697] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 09/30/2020] [Accepted: 09/30/2020] [Indexed: 01/01/2023]
Abstract
Malaria has been a global epidemic health threat since ancient times. It still claims roughly half a million lives every year in this century. Artemisinin and its derivatives, are frontline antimalarial drugs known for their efficacy and low toxicity. After decades of wide use, artemisinins remain our bulwark against malaria. Here, we review decades of efforts that aim to understand the mechanism of action (MOA) of artemisinins, which help explain the specificity and potency of this anti-malarial drug. We summarize the methods and approaches employed to unravel the MOA of artemisinin over the last three decades, showing how the development of advanced techniques can help provide mechanistic insights and resolve some long-standing questions in the field of artemisinin research. We also provide examples to illustrate how to better repurpose artemisinins for anti-cancer therapies by leveraging on MOA. These examples point out a practical direction to engineer artemisinin for broader applications beyond malaria.
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Affiliation(s)
- Jing Yang
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou, China; Artemisinin Research Center, and Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yingke He
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou, China; Department of Anaesthesiology, Singapore General Hospital, Singapore
| | - Yinbao Li
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou, JiangXi 341000, China
| | - Xing Zhang
- Artemisinin Research Center, and Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yin-Kwan Wong
- Artemisinin Research Center, and Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Shengnan Shen
- Artemisinin Research Center, and Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Tianyu Zhong
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou, China; Laboratory Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou, China.
| | - Jianbin Zhang
- Department of Oncology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, China.
| | - Qian Liu
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou, China.
| | - Jigang Wang
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou, China; Artemisinin Research Center, and Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China; Central People's Hospital of Zhanjiang, Zhanjiang, Guangdong, China; Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China.
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11
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El-Sheikh AA, Ameen SH, AbdEl-Fatah SS. Ameliorating Iron Overload in Intestinal Tissue of Adult Male Rats: Quercetin vs Deferoxamine. J Toxicol 2018; 2018:8023840. [PMID: 30584425 PMCID: PMC6280249 DOI: 10.1155/2018/8023840] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 10/03/2018] [Accepted: 10/09/2018] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE The aim of our study is to compare the role of the new natural alternative (Quercetin) with the current iron-chelation therapy (Deferoxamine (DFO)) in the effect of iron overload on small intestinal tissues and to investigate the possible underlying molecular mechanisms of such toxicity. METHODS Forty-two adult male albino rats were divided into six groups: control groups, DFO, Quercetin, iron overload, iron overload+DFO, and iron overload+Quercetin groups. Animals received daily intraperitoneal injection of Deferoxamine (125 mg /kg), Quercetin (10 mg/kg), and ferric dextran (200 mg/kg) for 2 weeks. RESULTS Iron overloaded group showed significant increase in serum iron, total iron binding capacity (TIBC), transferrin saturation percentage (TS %) hepcidin (HEPC), serum ferritin, nontransferrin bound iron (NTBI), and small intestinal tissues iron levels. Iron overload significantly increased the serum oxidative stress indicator (MDA) and reduced serum total antioxidant capacity (TAC). On the other hand, iron overload increased IL6 and reduced IL10 in small intestinal tissues reflecting inflammatory condition and increased caspase 3 reactivity indicating apoptosis and increased iNOs expressing cell indicting oxidative stress especially in ileum. In addition, it induced small intestinal tissues pathological alterations. The treatment with Quercetin showed nonsignificant differences as compared to treatment with DFO that chelated the serum and tissue iron and improved the oxidative stress and reduced tissue IL6 and increased IL10 and decreased caspase 3 and iNOs expressing cells in small intestinal tissues. Moreover, it ameliorated the iron overload induced pathological alterations. CONCLUSION Our study showed the potential role of Quercetin as iron chelator like DFO in case of iron overload induced small intestinal toxicity in adult rats because of its serum and tissue iron chelation, improvement of serum, and small intestinal oxidative stress, ameliorating iron induced intestinal inflammation, apoptosis, and histopathological alterations.
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Affiliation(s)
- Arwa A. El-Sheikh
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Zagazig University, Egypt
| | - Shimaa Hamed Ameen
- Forensic Medicine and Clinical Toxicology Department, Faculty of Medicine, Zagazig University, Egypt
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12
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Basak M, Dutta S, Chowdhury M. Wild raspberry: Antioxidant fruits from Eastern Himalaya. J Food Biochem 2018. [DOI: 10.1111/jfbc.12560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mridushree Basak
- Taxonomy of Angiosperms and Biosystematics Laboratory, Department of Botany; University of North Bengal; Siliguri West Bengal, 734 013 India
| | - Somit Dutta
- Cellular Immunology Laboratory, Department of Zoology; University of North Bengal; Siliguri West Bengal, 734 013 India
| | - Monoranjan Chowdhury
- Taxonomy of Angiosperms and Biosystematics Laboratory, Department of Botany; University of North Bengal; Siliguri West Bengal, 734 013 India
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13
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Guerrero-Hue M, Rubio-Navarro A, Sevillano Á, Yuste C, Gutiérrez E, Palomino-Antolín A, Román E, Praga M, Egido J, Moreno JA. Efectos adversos de la acumulación renal de hemoproteínas. Nuevas herramientas terapéuticas. Nefrologia 2018; 38:13-26. [DOI: 10.1016/j.nefro.2017.05.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 04/21/2017] [Accepted: 05/16/2017] [Indexed: 12/18/2022] Open
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Reeder BJ. Redox and Peroxidase Activities of the Hemoglobin Superfamily: Relevance to Health and Disease. Antioxid Redox Signal 2017; 26:763-776. [PMID: 27637274 DOI: 10.1089/ars.2016.6803] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
SIGNIFICANCE Erythrocyte hemoglobin (Hb) and myocyte myoglobin, although primarily oxygen-carrying proteins, have the capacity to do redox chemistry. Such redox activity in the wider family of globins now appears to have important associations with the mechanisms of cell stress response. In turn, an understanding of such mechanisms in vivo may have a potential in the understanding of cancer therapy resistance and neurodegenerative disorders such as Alzheimer's. Recent Advances: There has been an enhanced understanding of the redox chemistry of the globin superfamily in recent years, leading to advances in development of Hb-based blood substitutes and in hypotheses relating to specific disease mechanisms. Neuroglobin (Ngb) and cytoglobin (Cygb) have been linked to cell protection mechanisms against hypoxia and oxidative stress, with implications in the onset and progression of neurodegenerative diseases for Ngb and cancer for Cygb. CRITICAL ISSUES Despite advances in the understanding of redox chemistry of globins, the physiological roles of many of these proteins still remain ambiguous at best. Confusion over potential physiological roles may relate to multifunctional roles for globins, which may be modulated by surface-exposed cysteine pairs in some globins. Such roles may be critical in deciphering the relationships of these globins in human diseases. FUTURE DIRECTIONS Further studies are required to connect the considerable knowledge on the mechanisms of globin redox chemistry in vitro with the physiological and pathological roles of globins in vivo. In doing so, new therapies for neurodegenerative disorders and cancer therapy resistance may be targeted. Antioxid. Redox Signal. 26, 763-776.
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Affiliation(s)
- Brandon J Reeder
- School of Biological Sciences, University of Essex , Essex, United Kingdom
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Zhang CJ, Wang J, Zhang J, Lee YM, Feng G, Lim TK, Shen HM, Lin Q, Liu B. Mechanism-Guided Design and Synthesis of a Mitochondria-Targeting Artemisinin Analogue with Enhanced Anticancer Activity. Angew Chem Int Ed Engl 2016; 55:13770-13774. [DOI: 10.1002/anie.201607303] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Chong-Jing Zhang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Jigang Wang
- The State Key Laboratory of Pharmaceutical Biotechnology; College of Life Science; Nanjing University; Nanjing 210023 China
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Jianbin Zhang
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; 2 Medical Drive Singapore 117597 Singapore
| | - Yew Mun Lee
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Guangxue Feng
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Teck Kwang Lim
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Han-Ming Shen
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; 2 Medical Drive Singapore 117597 Singapore
| | - Qingsong Lin
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Bin Liu
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
- Institute of Materials Research and Engineering; 2 Fusionopolis Way Singapore 138634 Singapore
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16
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Zhang CJ, Wang J, Zhang J, Lee YM, Feng G, Lim TK, Shen HM, Lin Q, Liu B. Mechanism-Guided Design and Synthesis of a Mitochondria-Targeting Artemisinin Analogue with Enhanced Anticancer Activity. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Chong-Jing Zhang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Jigang Wang
- The State Key Laboratory of Pharmaceutical Biotechnology; College of Life Science; Nanjing University; Nanjing 210023 China
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Jianbin Zhang
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; 2 Medical Drive Singapore 117597 Singapore
| | - Yew Mun Lee
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Guangxue Feng
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
| | - Teck Kwang Lim
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Han-Ming Shen
- Department of Physiology; Yong Loo Lin School of Medicine; National University of Singapore; 2 Medical Drive Singapore 117597 Singapore
| | - Qingsong Lin
- Department of Biological Science; National University of Singapore; 14 Science Drive 4 Singapore 117543 Singapore
| | - Bin Liu
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive 4 Singapore 117585 Singapore
- Institute of Materials Research and Engineering; 2 Fusionopolis Way Singapore 138634 Singapore
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Lu N, Ding Y, Tian R, Yang Z, Chen J, Peng YY. Effects of pharmacological ascorbate on hemoglobin-induced cancer cell proliferation. Int J Biol Macromol 2016; 92:1215-1219. [PMID: 27527692 DOI: 10.1016/j.ijbiomac.2016.08.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 08/08/2016] [Accepted: 08/11/2016] [Indexed: 01/03/2023]
Abstract
The high heme content in red meat is associated with an increased risk of developing cancer. Pharmacologic concentrations of ascorbate can specifically kill a wide range of cancer cells. In this study, the impact of ascorbate at pharmacologic concentrations on hemoglobin (Hb)-modulated human hepatoma HepG2 cell survival was investigated. It was found that HepG2 cells were proliferated by Hb (5-25μM), but killed by high pharmacologic concentrations of ascorbate (2-10mM). Although ascorbate at the low pharmacologic concentration (0.5mM) alone exhibited insignificant effect on cell viability, it effectively inhibited Hb (10μM)-induced cancer cell proliferation. The mechanism of this cytotoxicity was based on the production of extracellular H2O2 and involved transition iron. The influence of ascorbate on Hb-dependent redox reactions (i.e. the oxidative stability of Hb and its cytotoxic ferryl intermediate) was further investigated to illustrate the reaction mechanism of ascorbate toxicity, where H2O2 was generated in the reaction of ascorbate with Hb. Furthermore, circular dichroism demonstrated no significant change in the secondary structure of Hb after ascorbate addition and molecular docking revealed binding modes of ascorbate with Hb. These results demonstrated that ascorbate could possess anti-cancer activity through interfering in Hb-dependent redox reactions.
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Affiliation(s)
- Naihao Lu
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China.
| | - Yun Ding
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China
| | - Rong Tian
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China
| | - Zhen Yang
- Department of Physics, University of Houston, Houston, TX, USA
| | - Jianfa Chen
- Department of Physics, University of Houston, Houston, TX, USA
| | - Yi-Yuan Peng
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China.
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18
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Awodele O, Adeneye AA, Aiyeola SA, Benebo AS. Modulatory effect of Mangifera indica against carbon tetrachloride induced kidney damage in rats. Interdiscip Toxicol 2016; 8:175-83. [PMID: 27486379 PMCID: PMC4961916 DOI: 10.1515/intox-2015-0027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 11/21/2015] [Accepted: 11/27/2015] [Indexed: 12/13/2022] Open
Abstract
There is little scientific evidence on the local use of Mangifera indica in kidney diseases. This study investigated the reno-modulatory roles of the aqueous stem bark extract of Mangifera indica (MIASE) against CCl4-induced renal damage. Rats were treated intragastrically with 125, 250 and 500 mg/kg/day MIASE for 7 days before and after the administration of CCl4 (3 ml/kg of 30% CCl4, i.p.). Serum levels of electrolytes (Na+, K+, Cl(-), HCO3(-)), urea and creatinine were determined. Renal tissue reduced glutathione (GSH), malondialdehyde (MDA), catalase (CAT), superoxide (SOD) activities were also assessed. The histopathological changes in kidneys were determined using standard methods. In CCl4 treated rats the results showed significant (p<0.05) increases in serum Na+, K+, Cl(-), urea and creatinine. CCl4 also caused significant (p<0.05) decreases in renal tissue SOD, CAT and GSH and significant (p<0.05) increases in MDA. The oral MIASE treatment (125-500 mg/kg) was found to significantly (p<0.05) attenuate the increase in serum electrolytes, urea and creatinine. Similarly, MIASE significantly (p<0.05) attenuated the decrease in SOD, CAT and GSH levels and correspondingly attenuated increases in MDA. Mangifera indica may present a great prospect for drug development in the management of kidney disease with lipid peroxidation as its etiology.
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Affiliation(s)
- Olufunsho Awodele
- Department of Pharmacology, Therapeutics and Toxicology, Faculty of Basic Medical Science, College of Medicine, University of Lagos, Idi-Araba, Suruiere, Lagos State, Nigeria
| | - Adejuwon Adewale Adeneye
- Department of Pharmacology, Faculty of Basic Medical Science, Lagos State University College of Medicine, Ikeja G.R.A., Lagos State, Nigeria
| | - Sheriff Aboyade Aiyeola
- Department of Pharmacology, Therapeutics and Toxicology, Faculty of Basic Medical Science, College of Medicine, University of Lagos, Idi-Araba, Suruiere, Lagos State, Nigeria
| | - Adokiye Senibo Benebo
- Department of Pathology and Forensic Medicine, Faculty of Basic Medical Science, Lagos State University College of Medicine, Ikeja G.R.A., Lagos State, Nigeria
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Lu N, Ding Y, Yang Z, Gao P. Effects of rutin on the redox reactions of hemoglobin. Int J Biol Macromol 2016; 89:175-80. [DOI: 10.1016/j.ijbiomac.2016.04.066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Revised: 04/21/2016] [Accepted: 04/22/2016] [Indexed: 01/17/2023]
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20
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López-Martínez LM, Pitarch-Jarque J, Martínez-Camarena À, García-España E, Tejero R, Santacruz-Ortega H, Navarro RE, Sotelo-Mundo RR, Leyva-Peralta MA, Doménech-Carbó A, Verdejo B. Synthesis, Characterization, and Cu(2+) Coordination Studies of a 3-Hydroxy-4-pyridinone Aza Scorpiand Derivative. Inorg Chem 2016; 55:7564-75. [PMID: 27433814 DOI: 10.1021/acs.inorgchem.6b01006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis, acid-base behavior, and Cu(2+) coordination chemistry of a new ligand (L1) consisting of an azamacrocyclic core appended with a lateral chain containing a 3-hydroxy-2-methyl-4(1H)-pyridinone group have been studied by potentiometry, cyclic voltammetry, and NMR and UV-vis spectroscopy. UV-vis and NMR studies showed that phenolate group was protonated at the highest pH values [log K = 9.72(1)]. Potentiometric studies point out the formation of Cu(2+) complexes of 1:2, 2:2, 4:3, 1:1, and 2:1 Cu(2+)/L1 stoichiometries. UV-vis analysis and electrochemical studies evidence the implication of the pyridinone moieties in the metal coordination of the 1:2 Cu(2+)/L1 complexes. L1 shows a stronger chelating ability than the reference chelating ligand deferiprone. While L1 shows no cytotoxicity in HeLa and ARPE-19 human cell lines (3.1-25.0 μg/mL), it has significant antioxidant activity, as denoted by TEAC assays at physiological pH. The addition of Cu(2+) diminishes the antioxidant activity because of its coordination to the pyridinone moiety phenolic group.
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Affiliation(s)
- Luis M López-Martínez
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora , Calle Rosales y Blvd. Luis Encinas s/n, Col. Centro, Hermosillo, Sonora 83000, México.,Instituto de Ciencia Molecular , C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain
| | - Javier Pitarch-Jarque
- Instituto de Ciencia Molecular , C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain
| | - Àlvar Martínez-Camarena
- Instituto de Ciencia Molecular , C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain
| | - Enrique García-España
- Instituto de Ciencia Molecular , C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain
| | - Roberto Tejero
- Departamento de Química Física, Universidad de Valencia , C/Dr Moliner 50, 46100 Burjassot, Valencia, Spain
| | - Hisila Santacruz-Ortega
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora , Calle Rosales y Blvd. Luis Encinas s/n, Col. Centro, Hermosillo, Sonora 83000, México
| | - Rosa-Elena Navarro
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora , Calle Rosales y Blvd. Luis Encinas s/n, Col. Centro, Hermosillo, Sonora 83000, México
| | - Rogerio R Sotelo-Mundo
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora , Calle Rosales y Blvd. Luis Encinas s/n, Col. Centro, Hermosillo, Sonora 83000, México.,Laboratorio de Estructura Biomolecular. Centro de Investigación en Alimentación y Desarrollo (CIAD) , A. C. Carretera a Ejido La Victoria Km 0.6, Hermosillo, Sonora 83304, México
| | - Mario Alberto Leyva-Peralta
- Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora , Calle Rosales y Blvd. Luis Encinas s/n, Col. Centro, Hermosillo, Sonora 83000, México
| | - Antonio Doménech-Carbó
- Departamento de Química Analítica, Universidad de Valencia , C/Dr Moliner 50, 46100 Burjassot, Valencia, Spain
| | - Begoña Verdejo
- Instituto de Ciencia Molecular , C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain
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21
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van Lith R, Wang X, Ameer G. Biodegradable Elastomers with Antioxidant and Retinoid-like Properties. ACS Biomater Sci Eng 2016; 2:268-277. [PMID: 27347559 DOI: 10.1021/acsbiomaterials.5b00534] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Intimal hyperplasia (IH) is a type of scarring that involves complex pathophysiological responses of the vasculature to injury, including overproliferation and migration of vascular smooth muscle cells (VSMCs), adventitial fibroblasts, and the activation of macrophages. The objective of this research was to develop a biodegradable polymer with intrinsic properties that would combat the cellular processes that contribute to IH. Citric acid, 1,8-octanediol, and all-trans retinoic acid (atRA) were incorporated into a polyester network via a condensation reaction to form the thermoset poly(1,8-octamethylene-citrate-co-retinate) (POCR). POCR was chemically characterized and assessed for the presence of antioxidant and retinoidlike properties. HNMR and ATR-FTIR confirmed the incorporation of atRA into the backbone of the polymer network. POCR was able to scavenge radicals and inhibit lipid peroxidation. The proliferation and migration of vascular smooth muscle cells cultured on POCR were inhibited, whereas endothelial cell proliferation and migration were not. These results are consistent with the biological effects of atRA. These results are the first to demonstrate the synthesis of a polymer with intrinsic antirestenotic properties for potential use in the fabrication of vascular devices such as stents and vascular grafts.
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Affiliation(s)
- Robert van Lith
- Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, United States
| | - Xuesong Wang
- Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, United States
| | - Guillermo Ameer
- Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, United States; Department of Surgery, Feinberg School of Medicine, Chicago, Illinois 60611, United States; Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, United States; Simpson Querrey Institute for BioNanotechnology in Medicine, Northwestern University, Chicago, Illinois 60611, United States; International Institute for Nanotechnology, Northwestern University, Evanston, Illinois 60208, United States
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Haem-activated promiscuous targeting of artemisinin in Plasmodium falciparum. Nat Commun 2015; 6:10111. [PMID: 26694030 PMCID: PMC4703832 DOI: 10.1038/ncomms10111] [Citation(s) in RCA: 406] [Impact Index Per Article: 45.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 11/04/2015] [Indexed: 12/17/2022] Open
Abstract
The mechanism of action of artemisinin and its derivatives, the most potent of the anti-malarial drugs, is not completely understood. Here we present an unbiased chemical proteomics analysis to directly explore this mechanism in Plasmodium falciparum. We use an alkyne-tagged artemisinin analogue coupled with biotin to identify 124 artemisinin covalent binding protein targets, many of which are involved in the essential biological processes of the parasite. Such a broad targeting spectrum disrupts the biochemical landscape of the parasite and causes its death. Furthermore, using alkyne-tagged artemisinin coupled with a fluorescent dye to monitor protein binding, we show that haem, rather than free ferrous iron, is predominantly responsible for artemisinin activation. The haem derives primarily from the parasite's haem biosynthesis pathway at the early ring stage and from haemoglobin digestion at the latter stages. Our results support a unifying model to explain the action and specificity of artemisinin in parasite killing. The mechanism of action of artemisinin, an antimalarial drug, is not well understood. Here, the authors use a labelled artemisinin analogue to show that the drug is mainly activated by haem and then binds covalently to over 120 proteins in the malaria parasite, affecting many of its cellular processes.
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3-Hydroxypyridinone derivatives as metal-sequestering agents for therapeutic use. Future Med Chem 2015; 7:383-410. [PMID: 25826364 DOI: 10.4155/fmc.14.162] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Although iron is one of the most important metal ions for living organisms, it becomes toxic when in excess or misplaced. This review presents a glance at representative examples of hydroxypyridinone-based chelators, which have been recently developed as potential clinically useful drugs for metal overload diseases, mostly associated with excess of iron but also other hard metal-ions. It also includes a detailed discussion on the factors assisting chelator design strategy toward fulfillment of the most relevant biochemical properties of hydroxypyridinone chelators, highlighting structure-activity relationships and a variety of potential clinical applications, beyond chelatotherapy. This study appears as a response to the growing interest on metal chelation therapy and opens new perspectives of possible applications in future medicine.
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Lu N, Li J, Ren X, Tian R, Peng YY. Nitrite attenuated hypochlorous acid-mediated heme degradation in hemoglobin. Chem Biol Interact 2015; 238:25-32. [DOI: 10.1016/j.cbi.2015.05.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 04/30/2015] [Accepted: 05/29/2015] [Indexed: 01/08/2023]
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25
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Bielitza M, Belorgey D, Ehrhardt K, Johann L, Lanfranchi DA, Gallo V, Schwarzer E, Mohring F, Jortzik E, Williams DL, Becker K, Arese P, Elhabiri M, Davioud-Charvet E. Antimalarial NADPH-Consuming Redox-Cyclers As Superior Glucose-6-Phosphate Dehydrogenase Deficiency Copycats. Antioxid Redox Signal 2015; 22:1337-51. [PMID: 25714942 PMCID: PMC4410756 DOI: 10.1089/ars.2014.6047] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 01/28/2015] [Accepted: 02/24/2015] [Indexed: 12/21/2022]
Abstract
AIMS Early phagocytosis of glucose-6-phosphate dehydrogenase (G6PD)-deficient erythrocytes parasitized by Plasmodium falciparum were shown to protect G6PD-deficient populations from severe malaria. Here, we investigated the mechanism of a novel antimalarial series, namely 3-[substituted-benzyl]-menadiones, to understand whether these NADPH-consuming redox-cyclers, which induce oxidative stress, mimic the natural protection of G6PD deficiency. RESULTS We demonstrated that the key benzoylmenadione metabolite of the lead compound acts as an efficient redox-cycler in NADPH-dependent methaemoglobin reduction, leading to the continuous formation of reactive oxygen species, ferrylhaemoglobin, and subsequent haemichrome precipitation. Structure-activity relationships evidenced that both drug metabolites and haemoglobin catabolites contribute to potentiate drug effects and inhibit parasite development. Disruption of redox homeostasis by the lead benzylmenadione was specifically induced in Plasmodium falciparum parasitized erythrocytes and not in non-infected cells, and was visualized via changes in the glutathione redox potential of living parasite cytosols. Furthermore, the redox-cycler shows additive and synergistic effects in combination with compounds affecting the NADPH flux in vivo. INNOVATION The lead benzylmenadione 1c is the first example of a novel redox-active agent that mimics the behavior of a falciparum parasite developing inside a G6PD-deficient red blood cell (RBC) giving rise to malaria protection, and it exerts specific additive effects that are inhibitory to parasite development, without harm for non-infected G6PD-sufficient or -deficient RBCs. CONCLUSION This strategy offers an innovative perspective for the development of future antimalarial drugs for G6PD-sufficient and -deficient populations.
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Affiliation(s)
- Max Bielitza
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
| | - Didier Belorgey
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
| | - Katharina Ehrhardt
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
- Department of Infectiology, University of Heidelberg, Heidelberg, Germany
| | - Laure Johann
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
| | - Don Antoine Lanfranchi
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
| | - Valentina Gallo
- Department of Oncology, University of Torino Medical School, Torino, Italy
| | - Evelin Schwarzer
- Department of Oncology, University of Torino Medical School, Torino, Italy
| | - Franziska Mohring
- Biochemistry and Molecular Biology, Interdisciplinary Research Center (IFZ), Justus Liebig University of Giessen, Giessen, Germany
| | - Esther Jortzik
- Biochemistry and Molecular Biology, Interdisciplinary Research Center (IFZ), Justus Liebig University of Giessen, Giessen, Germany
| | - David L. Williams
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Katja Becker
- Biochemistry and Molecular Biology, Interdisciplinary Research Center (IFZ), Justus Liebig University of Giessen, Giessen, Germany
| | - Paolo Arese
- Department of Oncology, University of Torino Medical School, Torino, Italy
| | - Mourad Elhabiri
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
| | - Elisabeth Davioud-Charvet
- UMR 7509 Centre National de la Recherche Scientifique and University of Strasbourg, European School of Chemistry, Polymers and Materials (ECPM), Strasbourg, France
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26
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Zhang Y, Wang H, Cui L, Zhang Y, Liu Y, Chu X, Liu Z, Zhang J, Chu L. Continuing treatment with Salvia miltiorrhiza injection attenuates myocardial fibrosis in chronic iron-overloaded mice. PLoS One 2015; 10:e0124061. [PMID: 25850001 PMCID: PMC4388639 DOI: 10.1371/journal.pone.0124061] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 02/28/2015] [Indexed: 12/27/2022] Open
Abstract
Iron overload cardiomyopathy results from iron accumulation in the myocardium that is closely linked to iron-mediated myocardial fibrosis. Salvia miltiorrhiza (SM, also known as Danshen), a traditional Chinese medicinal herb, has been widely used for hundreds of years to treat cardiovascular diseases. Here, we investigated the effect and potential mechanism of SM on myocardial fibrosis induced by chronic iron overload (CIO) in mice. Kunming male mice (8 weeks old) were randomized to six groups of 10 animals each: control (CONT), CIO, low-dose SM (L-SM), high-dose SM (H-SM), verapamil (VRP) and deferoxamine (DFO) groups. Normal saline was injected in the CONT group. Mice in the other five groups were treated with iron dextran at 50 mg/kg per day intraperitoneally for 7 weeks, and those in the latter four groups also received corresponding daily treatments, including 3 g/kg or 6 g/kg of SM, 100 mg/kg of VRP, or 100 mg/kg of DFO. The iron deposition was estimated histologically using Prussian blue staining. Myocardial fibrosis was determined by Masson's trichrome staining and hydroxyproline (Hyp) quantitative assay. Superoxide dismutase (SOD) activity, malondialdehyde (MDA) content and protein expression levels of type I collagen (COL I), type I collagen (COL III), transforming growth factor-β1 (TGF-β1) and matrix metalloproteinase-9 (MMP-9) were analyzed to investigate the mechanisms underlying the effects of SM against iron-overloaded fibrosis. Treatment of chronic iron-overloaded mice with SM dose-dependently reduced iron deposition levels, fibrotic area percentage, Hyp content, expression levels of COL I and COL III, as well as upregulated the expression of TGF- β1 and MMP-9 proteins in the heart. Moreover, SM treatment decreased MDA content and increased SOD activity. In conclusion, SM exerted activities against cardiac fibrosis induced by CIO, which may be attributed to its inhibition of iron deposition, as well as collagen metabolism and oxidative stress.
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Affiliation(s)
- Ying Zhang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Hao Wang
- Department of Chinese Materia Medica, Hebei Medical University, Shijiazhuang, China
| | - Lijing Cui
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Yuanyuan Zhang
- Department of Pharmaceutics, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Yang Liu
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Xi Chu
- The Fourth Hospital of Hebei Medical University, Shijiazhuang, China
| | - Zhenyi Liu
- Department of Pharmaceutics, Hebei University of Chinese Medicine, Shijiazhuang, China
| | - Jianping Zhang
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China
| | - Li Chu
- Department of Pharmacology, Hebei Medical University, Shijiazhuang, China
- * E-mail:
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In vitro heme and non-heme iron capture from hemoglobin, myoglobin and ferritin by bovine lactoferrin and implications for suppression of reactive oxygen species in vivo. Biometals 2014; 27:1371-82. [PMID: 25280951 DOI: 10.1007/s10534-014-9798-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 09/28/2014] [Indexed: 01/18/2023]
Abstract
Lactoferrin (Lf), present in colostrum and milk is a member of the transferrin family of iron-binding glyco-proteins, with stronger binding capacity to ferric iron than hemoglobin, myoglobin or transferrin. Unlike hemoglobin and myoglobin, iron-bound Lf is reasonably stable to gastric and duodenal digestive conditions. Unlike ferrous iron, ferric iron is not directly reactive with oxygen supporting the capacity of Lf capture of heme iron to suppress reactive oxygen species (ROS) production. We therefore hypothesized that bovine Lf could capture and thereby terminate the cycle of ROS production by heme iron. The transfer of heme iron from either intact or digested forms of hemoglobin and myoglobin and from intact ferritin was demonstrated by in vitro methods, monitoring Fe-saturation status of Lf by changes in absorptivity at 465 nm. The results are discussed in the context of new proposed opportunities for orally administered Lf to regulate oxidative damage associated with heme iron. In addition to potentially suppressing oxidative heme-iron-mediated tissue damage in the lumen, Lf is expected to also reverse the overload of ferritin-bound iron, that accompanies chronic inflammation and aging. These new proposed uses of Lf are additional to known host defense functions that include anti-microbial, anti-viral properties, immune and cancer cell growth regulation. The findings and interpretations presented require clinical substantiation and may support important additional protective and therapeutic uses for Lf in the future.
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Lu N, Chen C, He Y, Tian R, Xiao Q, Peng YY. The dual effects of nitrite on hemoglobin-dependent redox reactions. Nitric Oxide 2014; 40:1-9. [DOI: 10.1016/j.niox.2014.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 04/22/2014] [Accepted: 04/25/2014] [Indexed: 12/18/2022]
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van Lith R, Gregory EK, Yang J, Kibbe MR, Ameer GA. Engineering biodegradable polyester elastomers with antioxidant properties to attenuate oxidative stress in tissues. Biomaterials 2014; 35:8113-22. [PMID: 24976244 DOI: 10.1016/j.biomaterials.2014.06.004] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 06/01/2014] [Indexed: 12/22/2022]
Abstract
Oxidative stress plays an important role in the limited biological compatibility of many biomaterials due to inflammation, as well as in various pathologies including atherosclerosis and restenosis as a result of vascular interventions. Engineering antioxidant properties into a material is therefore a potential avenue to improve the biocompatibility of materials, as well as to locally attenuate oxidative stress-related pathologies. Moreover, biodegradable polymers that have antioxidant properties built into their backbone structure have high relative antioxidant content and may provide prolonged, continuous attenuation of oxidative stress while the polymer or its degradation products are present. In this report, we describe the synthesis of poly(1,8-octanediol-co-citrate-co-ascorbate) (POCA), a citric-acid based biodegradable elastomer with native, intrinsic antioxidant properties. The in vitro antioxidant activity of POCA as well as its effects on vascular cells in vitro and in vivo were studied. Antioxidant properties investigated included scavenging of free radicals, iron chelation and the inhibition of lipid peroxidation. POCA reduced reactive oxygen species generation in cells after an oxidative challenge and protected cells from oxidative stress-induced cell death. Importantly, POCA antioxidant properties remained present upon degradation. Vascular cells cultured on POCA showed high viability, and POCA selectively inhibited smooth muscle cell proliferation, while supporting endothelial cell proliferation. Finally, preliminary data on POCA-coated ePTFE grafts showed reduced intimal hyperplasia when compared to standard ePTFE grafts. This biodegradable, intrinsically antioxidant polymer may be useful for tissue engineering application where oxidative stress is a concern.
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Affiliation(s)
- Robert van Lith
- Biomedical Engineering Department, Northwestern University, Evanston IL 60208, USA
| | - Elaine K Gregory
- Department of Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA; Institute for BioNanotechnology in Medicine, Northwestern University, Chicago IL 60611, USA
| | - Jian Yang
- Biomedical Engineering Department, Northwestern University, Evanston IL 60208, USA
| | - Melina R Kibbe
- Department of Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA; Institute for BioNanotechnology in Medicine, Northwestern University, Chicago IL 60611, USA
| | - Guillermo A Ameer
- Biomedical Engineering Department, Northwestern University, Evanston IL 60208, USA; Department of Surgery, Feinberg School of Medicine, Northwestern University, Chicago IL 60611, USA; Chemistry of Life Processes Institute, Northwestern University, Evanston IL 60208, USA; Institute for BioNanotechnology in Medicine, Northwestern University, Chicago IL 60611, USA.
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Lu N, He Y, Chen C, Tian R, Xiao Q, Peng YY. Tyrosine can protect against oxidative stress through ferryl hemoglobin reduction. Toxicol In Vitro 2014; 28:847-55. [PMID: 24698734 DOI: 10.1016/j.tiv.2014.03.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 02/19/2014] [Accepted: 03/21/2014] [Indexed: 10/25/2022]
Abstract
The toxic mechanism of hemoglobin (Hb) under oxidative stress is linked to the formations of highly cytotoxic ferryl species and subsequently heme-to-protein cross-linked derivative of Hb (Hb-X). In this study, we have examined the effects of free tyrosine and its analogues (3-chlorotyrosine, phenylalanine) on the stability of ferryl hemoglobin and the formation of Hb-X. The results showed that free tyrosine (not phenylalanine, 10-500 μM) was an efficient reducing agent of ferryl species and also effective at preventing the formation of cytotoxic Hb-X. Meanwhile, the dimeric tyrosine was formed as the oxidation product of tyrosine during Hb redox reaction. Compared with free tyrosine, 3-chlorotyrosine, an oxidation product of tyrosine and a proposed biomarker for hypochlorous acid (HOCl) in vivo, exhibited stronger antioxidant properties in Hb-induced oxidative stress, which was consistent with its more efficient ability in the reduction of ferryl species. These results showed that the presence of tyrosine and its derivative in vivo and vitro could ameliorate oxidative damage through ferryl heme reduction. The antioxidant ability, therefore, may provide new insights into the nutritional and physiological significance of free tyrosine with redox active heme proteins-related oxidative stress.
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Affiliation(s)
- Naihao Lu
- Jiangxi Key Laboratory of Functional Organic Molecules, Jiangxi Science and Technology Normal University, Nanchang 330013, China; Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.
| | - Yingjie He
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
| | - Chao Chen
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
| | - Rong Tian
- Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
| | - Qiang Xiao
- Jiangxi Key Laboratory of Functional Organic Molecules, Jiangxi Science and Technology Normal University, Nanchang 330013, China.
| | - Yi-Yuan Peng
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China; Key Laboratory of Green Chemistry, Jiangxi Province and College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
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Lu NH, Chen C, He YJ, Tian R, Xiao Q, Peng YY. Effects of quercetin on hemoglobin-dependent redox reactions: relationship to iron-overload rat liver injury. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2013; 15:1265-1276. [PMID: 24215437 DOI: 10.1080/10286020.2013.838952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Flavonoids have been widely reported to protect liver injury in iron-overload diseases, where the mechanism of this therapeutic action is dependent on their antioxidant effects, including free radical scavenging and metal-chelating. In this study, in contrast to the significant decrease in iron content, quercetin (Qu) from lower diet (0.3%, w/w) showed pro-oxidant ability on protein carbonyl formation and exhibited unobvious effect on iron-overload rat liver injury. Furthermore, the anti- and pro-oxidant activities of Qu on hemoglobin (Hb)-dependent redox reactions (i.e. the oxidative stability of Hb and its cytotoxic ferryl intermediate, Hb-induced protein oxidation) were investigated to illustrate the elevated protein oxidation in lower Qu-treated iron-overload rat. It was found that superoxide (O₂·⁻) and hydrogen peroxide (H₂O₂) were generated during the reaction between Qu and Hb. Qu, however, effectively reduced ferryl intermediate back to ferric Hb in a biphasic kinetic reaction. Moreover, Qu could significantly aggravate Hb-H₂O₂-induced protein oxidation at low concentrations and exhibit protective effects at high concentrations. Different from the classic antioxidant mechanisms of Qu, the dual effects on Hb redox reactions in vitro, therefore, may provide new insights into the physiological and pharmacological implications of Qu with iron-overload disease.
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Affiliation(s)
- Nai-Hao Lu
- a Jiangxi Key Laboratory of Functional Organic Molecules, Jiangxi Science and Technology Normal University , Nanchang , 330013 , China
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Heme oxygenase 1-generated carbon monoxide and biliverdin attenuate the course of experimental necrotizing pancreatitis. Pancreas 2013; 42:265-71. [PMID: 23000891 DOI: 10.1097/mpa.0b013e318264cc8b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE The cytoprotective enzyme heme oxygenase 1 (HO-1) is highly up-regulated in acute pancreatitis (AP). In this study, we tested its metabolites as potential therapeutic agents for AP in rats. METHODS Acute necrotizing pancreatitis was induced by retrograde intraductal injection of sodium taurocholate in rats. Biliverdin hydrochloride (BV HCl) (50 μmol/kg subcutaneously), the carbon monoxide, donor methylene chloride (MC) (500 mg/kg orally), or iron-chelating desferrioxamine (DFO) (125 mg/kg subcutaneously) were administered in a therapeutic manner starting with the first dose 4 hours after taurocholate injection to mimic the effects of HO-1 metabolites. RESULTS Administration of BV HCl, MC, or DFO showed significant reduction of inflammatory activity in comparison to controls leading to lower myeloperoxidase activity in the pancreas, less edema, lower ascites volumes, and preservation of tissue integrity (P < 0.05). Administration of either BV HCl or MC markedly increased 5-day survival rate (70% and 75% vs 40%; P < 0.05), whereas DFO had no significant effect on survival (60%). When given in therapeutic manner, all 3 substances led to diminished nuclear factor κB activity in the pancreas (P < 0.05). CONCLUSIONS Therapeutic use of BV HCl and MC led to marked reduction of mortality in experimental pancreatitis. Thus, HO-1 metabolites may present a novel therapeutic approach in AP treatment.
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Reeder BJ, Svistunenko DA, Cooper CE, Wilson MT. Engineering Tyrosine-Based Electron Flow Pathways in Proteins: The Case of Aplysia Myoglobin. J Am Chem Soc 2012; 134:7741-9. [DOI: 10.1021/ja211745g] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brandon J. Reeder
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ,
United Kingdom
| | - Dimitri A. Svistunenko
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ,
United Kingdom
| | - Chris E. Cooper
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ,
United Kingdom
| | - Michael T. Wilson
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ,
United Kingdom
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Carbon monoxide promotes respiratory hemoproteins iron reduction using peroxides as electron donors. PLoS One 2012; 7:e33039. [PMID: 22427940 PMCID: PMC3299724 DOI: 10.1371/journal.pone.0033039] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Accepted: 02/09/2012] [Indexed: 01/27/2023] Open
Abstract
The physiological role of the respiratory hemoproteins (RH), hemoglobin and myoglobin, is to deliver O(2) via its binding to their ferrous (Fe(II)) heme-iron. Under variety of pathological conditions RH proteins leak to blood plasma and oxidized to ferric (Fe(III), met) forms becoming the source of oxidative vascular damage. However, recent studies have indicated that both metRH and peroxides induce Heme Oxygenase (HO) enzyme producing carbon monoxide (CO). The gas has an extremely high affinity for the ferrous heme-iron and is known to reduce ferric hemoproteins in the presence of suitable electron donors. We hypothesized that under in vivo plasma conditions, peroxides at low concentration can assist the reduction of metRH in presence of CO. The effect of CO on interaction of metRH with hydrophilic or hydrophobic peroxides was analyzed by following Soret and visible light absorption changes in reaction mixtures. It was found that under anaerobic conditions and low concentrations of RH and peroxides mimicking plasma conditions, peroxides served as electron donors and RH were reduced to their ferrous carboxy forms. The reaction rates were dependent on CO as well as peroxide concentrations. These results demonstrate that oxidative activity of acellular ferric RH and peroxides may be amended by CO turning on the reducing potential of peroxides and facilitating the formation of redox-inactive carboxyRH. Our data suggest the possible role of HO/CO in protection of vascular system from oxidative damage.
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Santos MA, Marques SM, Chaves S. Hydroxypyridinones as “privileged” chelating structures for the design of medicinal drugs. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.08.008] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Percy ME, Kruck TPA, Pogue AI, Lukiw WJ. Towards the prevention of potential aluminum toxic effects and an effective treatment for Alzheimer's disease. J Inorg Biochem 2011; 105:1505-12. [PMID: 22099160 PMCID: PMC3714848 DOI: 10.1016/j.jinorgbio.2011.08.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2011] [Revised: 07/31/2011] [Accepted: 08/01/2011] [Indexed: 01/19/2023]
Abstract
In 1991, treatment with low dose intramuscular desferrioxamine (DFO), a trivalent chelator that can remove excessive iron and/or aluminum from the body, was reported to slow the progression of Alzheimer's disease (AD) by a factor of two. Twenty years later this promising trial has not been followed up and why this treatment worked still is not clear. In this critical interdisciplinary review, we provide an overview of the complexities of AD and involvement of metal ions, and revisit the neglected DFO trial. We discuss research done by us and others that is helping to explain involvement of metal ion catalyzed production of reactive oxygen species in the pathogenesis of AD, and emerging strategies for inhibition of metal-ion toxicity. Highlighted are insights to be considered in the quests to prevent potentially toxic effects of aluminum toxicity and prevention and intervention in AD.
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Affiliation(s)
- Maire E Percy
- Neurogenetics Laboratory, Surrey Place Centre, Toronto, ON, Canada M5S 2C2.
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Boutaud O, Roberts LJ. Mechanism-based therapeutic approaches to rhabdomyolysis-induced renal failure. Free Radic Biol Med 2011; 51:1062-7. [PMID: 21034813 PMCID: PMC3116013 DOI: 10.1016/j.freeradbiomed.2010.10.704] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 10/18/2010] [Accepted: 10/19/2010] [Indexed: 10/18/2022]
Abstract
Rhabdomyolysis-induced renal failure represents up to 15% of all cases of acute renal failure. Many studies over the past 4 decades have demonstrated that accumulation of myoglobin in the kidney is central in the mechanism leading to kidney injury. However, some discussion exists regarding the mechanism mediating this oxidant injury. Although the free-iron-catalyzed Fenton reaction has been proposed to explain the tissue injury, more recent evidence strongly suggests that the main cause of oxidant injury is myoglobin redox cycling and generation of oxidized lipids. These molecules can propagate tissue injury and cause renal vasoconstriction, two of the three main conditions associated with acute renal failure. This review presents the evidence supporting the two mechanisms of oxidative injury, describes the central role of myoglobin redox cycling in the pathology of renal failure associated with rhabdomyolysis, and discusses the value of therapeutic interventions aiming at inhibiting myoglobin redox cycling for the treatment of rhabdomyolysis-induced renal failure.
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Affiliation(s)
- Olivier Boutaud
- Department of Pharmacology, Vanderbilt University Medical Center, Nashville, TN 37232, USA.
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Synthetic and natural iron chelators: therapeutic potential and clinical use. Future Med Chem 2011; 1:1643-70. [PMID: 21425984 DOI: 10.4155/fmc.09.121] [Citation(s) in RCA: 155] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Iron-chelation therapy has its origins in the treatment of iron-overload syndromes. For many years, the standard for this purpose has been deferoxamine. Recently, considerable progress has been made in identifying synthetic chelators with improved pharmacologic properties relative to deferoxamine. Most notable are deferasirox (Exjade(®)) and deferiprone (Ferriprox(®)), which are now available clinically. In addition to treatment of iron overload, there is an emerging role for iron chelators in the treatment of diseases characterized by oxidative stress, including cardiovascular disease, atherosclerosis, neurodegenerative diseases and cancer. While iron is not regarded as the underlying cause of these diseases, it does play an important role in disease progression, either through promotion of cellular growth and proliferation or through participation in redox reactions that catalyze the formation of reactive oxygen species and increase oxidative stress. Thus, iron chelators may be of therapeutic benefit in many of these conditions. Phytochemicals, many of which bind iron, may also owe some of their beneficial properties to iron chelation. This review will focus on the advances in iron-chelation therapy for the treatment of iron-overload disease and cancer, as well as neurodegenerative and chronic inflammatory diseases. Established and novel iron chelators will be discussed, as well as the emerging role of dietary plant polyphenols that effectively modulate iron biochemistry.
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Comparing the potential renal protective activity of desferrioxamine B and the novel chelator desferrioxamine B-N-(3-hydroxyadamant-1-yl)carboxamide in a cell model of myoglobinuria. Biochem J 2011; 435:669-77. [PMID: 21320071 DOI: 10.1042/bj20101728] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Accumulating Mb (myoglobin) in the kidney following severe burns promotes oxidative damage and inflammation, which leads to acute renal failure. The potential for haem-iron to induce oxidative damage has prompted testing of iron chelators [e.g. DFOB (desferrioxamine B)] as renal protective agents. We compared the ability of DFOB and a DFOB-derivative {DFOB-AdAOH [DFOB-N-(3-hydroxyadamant-1-yl)carboxamide]} to protect renal epithelial cells from Mb insult. Loading kidney-tubule epithelial cells with dihydrorhodamine-123 before exposure to 100 μM Mb increased rhodamine-123 fluorescence relative to controls (absence of Mb), indicating increased oxidative stress. Extracellular Mb elicited a reorganization of the transferrin receptor as assessed by monitoring labelled transferrin uptake with flow cytometry and inverted fluorescence microscopy. Mb stimulated HO-1 (haem oxygenase-1), TNFα (tumour necrosis factor α), and both ICAM (intercellular adhesion molecule) and VCAM (vascular cell adhesion molecule) gene expression and inhibited epithelial monolayer permeability. Pre-treatment with DFOB or DFOB-AdAOH decreased Mb-mediated rhodamine-123 fluorescence, HO-1, ICAM and TNFα gene expression and restored monolayer permeability. MCP-1 (monocyte chemotactic protein 1) secretion increased in cells exposed to Mb-insult and this was abrogated by DFOB or DFOB-AdAOH. Cells treated with DFOB or DFOB-AdAOH alone showed no change in permeability, MCP-1 secretion or HO-1, TNFα, ICAM or VCAM gene expression. Similarly to DFOB, incubation of DFOB-AdAOH with Mb plus H2O2 yielded nitroxide radicals as detected by EPR spectroscopy, indicating a potential antioxidant activity in addition to metal chelation; Fe(III)-loaded DFOB-AdAOH showed no nitroxide radical formation. Overall, the chelators inhibited Mb-induced oxidative stress and inflammation and improved epithelial cell function. DFOB-AdAOH showed similar activity to DFOB, indicating that this novel low-toxicity chelator may protect the kidney after severe burns.
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Anti- and pro-oxidant effects of (+)-catechin on hemoglobin-induced protein oxidative damage. Toxicol In Vitro 2011; 25:833-8. [DOI: 10.1016/j.tiv.2011.02.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 01/07/2011] [Accepted: 02/11/2011] [Indexed: 01/16/2023]
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Lu N, Chen W, Peng YY. Effects of glutathione, Trolox and desferrioxamine on hemoglobin-induced protein oxidative damage: anti-oxidant or pro-oxidant? Eur J Pharmacol 2011; 659:95-101. [PMID: 21419762 DOI: 10.1016/j.ejphar.2011.03.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Revised: 02/21/2011] [Accepted: 03/08/2011] [Indexed: 12/23/2022]
Abstract
Evidence to support the role of heme proteins as major inducers of oxidative damage is increasingly present. Antioxidants have been widely used to ameliorate oxidative damage in vivo and in vitro, where the mechanism of this therapeutic action was usually dependent on their anti-oxidant effects. In this study, we chose three classic antioxidants, i.e. glutathione (GSH, an important intracellular antioxidant), 6-hydroxy-2, 5, 7, 8-tetramethylchroman-2-carboxylic acid (Trolox, a phenolic antioxidant without chelating effect) and desferrioxamine (DFO, a good iron chelator), to study their efficiencies on hemoglobin-induced protein oxidative damage. It was found that all of these antioxidants had the capacities to act as free radical scavengers and reducing agents to remove cytotoxic ferryl hemoglobin, demonstrating apparent anti-oxidant activities. However, the effects on hemoglobin-H(2)O(2)-induced protein oxidation depended on the categories and concentrations of antioxidants. GSH efficiently inhibited protein (bovine serum albumin or rat heart homogenate) carbonyl formation in a dose-dependent manner. In contrast to their protective effects at high concentrations, both Trolox and DFO could significantly aggravate protein oxidation at low concentrations. The pro-oxidant effects of Trolox and DFO on hemoglobin-mediated oxidative damage were probably related to their abilities in producing additional free radicals, such as superoxide (O·(2)(-)) and hydroxyl radical (·OH). The dual effects on hemoglobin redox reactions may provide new insights into the physiological implications of Trolox and DFO with cellular heme proteins.
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Affiliation(s)
- Naihao Lu
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Life Science, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China
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Reeder BJ. The redox activity of hemoglobins: from physiologic functions to pathologic mechanisms. Antioxid Redox Signal 2010; 13:1087-123. [PMID: 20170402 DOI: 10.1089/ars.2009.2974] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Pentacoordinate respiratory hemoproteins such as hemoglobin and myoglobin have evolved to supply cells with oxygen. However, these respiratory heme proteins are also known to function as redox enzymes, reacting with compounds such as nitric oxide and peroxides. The recent discoveries of hexacoordinate hemoglobins in vertebrates and nonsymbiotic plants suggest that the redox activity of globins is inherent to the molecule. The uncontrolled formation of radical species resulting from such redox chemistry on respiratory hemoproteins can lead to oxidative damage and cellular toxicity. In this review, we examine the functions of various globins and the mechanisms by which these globins act as redox enzymes under physiologic conditions. Evidence that redox reactions also occur under disease conditions, leading to pathologic complications, also is examined, focusing on recent discoveries showing that the ferryl oxidation state of these hemoproteins is present in these disease states in vivo. In addition, we review the latest advances in the understanding of globin redox mechanisms and how they might affect cellular signaling pathways and how they might be controlled therapeutically or, in the case of hemoglobin-based blood substitutes, through rational design.
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Affiliation(s)
- Brandon J Reeder
- Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex, England.
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ROLE OF CHELATABLE IRON VERSUS MYOGLOBIN IN OXIDATIVE STRESS AFTER CRUSH TRAUMA. Shock 2010; 33:552-3. [DOI: 10.1097/shk.0b013e3181c24fa7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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O’Neill PM, Barton VE, Ward SA. The molecular mechanism of action of artemisinin--the debate continues. Molecules 2010; 15:1705-21. [PMID: 20336009 PMCID: PMC6257357 DOI: 10.3390/molecules15031705] [Citation(s) in RCA: 370] [Impact Index Per Article: 26.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Revised: 02/23/2010] [Accepted: 03/09/2010] [Indexed: 12/24/2022] Open
Abstract
Despite international efforts to 'roll back malaria' the 2008 World Malaria Report revealed the disease still affects approximately 3 billion people in 109 countries; 45 within the WHO African region. The latest report however does provide some 'cautious optimism'; more than one third of malarious countries have documented greater than 50% reductions in malaria cases in 2008 compared to 2000. The goal of the Member States at the World Health Assembly and 'Roll Back Malaria' (RBM) partnership is to reduce the numbers of malaria cases and deaths recorded in 2000 by 50% or more by the end of 2010. Although malaria is preventable it is most prevalent in poorer countries where prevention is difficult and prophylaxis is generally not an option. The burden of disease has increased by the emergence of multi drug resistant (MDR) parasites which threatens the use of established and cost effective antimalarial agents. After a major change in treatment policies, artemisinins are now the frontline treatment to aid rapid clearance of parasitaemia and quick resolution of symptoms. Since artemisinin and its derivatives are eliminated rapidly, artemisinin combination therapies (ACT's) are now recommended to delay resistance mechanisms. In spite of these precautionary measures reduced susceptibility of parasites to the artemisinin-based component of ACT's has developed at the Thai-Cambodian border, a historical 'hot spot' for MDR parasite evolution and emergence. This development raises serious concerns for the future of the artemsinins and this is not helped by controversy related to the mode of action. Although a number of potential targets have been proposed the actual mechanism of action remains ambiguous. Interestingly, artemisinins have also shown potent and broad anticancer properties in cell lines and animal models and are becoming established as anti-schistosomal agents. In this review we will discuss the recent evidence explaining bioactivation and potential molecular targets in the chemotherapy of malaria and cancer.
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Affiliation(s)
- Paul M. O’Neill
- Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L697ZD, UK; E-Mail: (V.E.B.)
- Author to whom correspondence should be addressed; E-Mail: .
| | - Victoria E. Barton
- Department of Chemistry, University of Liverpool, Oxford Street, Liverpool L697ZD, UK; E-Mail: (V.E.B.)
| | - Stephen A. Ward
- Liverpool School of Tropical Medicine, Pembroke Place Liverpool L35QA, UK; E-Mail: (S.A.W.)
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Kovacic P, Somanathan R. Unifying mechanism for metals in toxicity, carcinogenicity and therapeutic action: integrated approach involving electron transfer, oxidative stress, antioxidants, cell signaling and receptors. J Recept Signal Transduct Res 2010; 30:51-60. [DOI: 10.3109/10799890903582578] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Buehler PW, D'Agnillo F. Toxicological consequences of extracellular hemoglobin: biochemical and physiological perspectives. Antioxid Redox Signal 2010; 12:275-91. [PMID: 19659434 DOI: 10.1089/ars.2009.2799] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Under normal physiology, human red blood cells (RBCs) demonstrate a circulating lifespan of approximately 100-120 days with efficient removal of senescent RBCs taking place via the reticuloendothelial system, spleen, and bone marrow phagocytosis. Within this time frame, hemoglobin (Hb) is effectively protected by efficient RBC enzymatic systems designed to allow for interaction between Hb and diffusible ligands while preventing direct contact between Hb and the external environment. Under normal resting conditions, the concentration of extracellular Hb in circulation is therefore minimal and controlled by specific plasma and cellular (monocyte/macrophage) binding proteins (haptoglobin) and receptors (CD163), respectively. However, during pathological conditions leading to hemolysis, extracellular Hb concentrations exceed normal plasma and cellular binding capacities, allowing Hb to become a biologically relevant vasoactive and redox active protein within the circulation and at extravascular sites. Under conditions of genetic, drug-induced, and autoimmune hemolytic anemias, large quantities of Hb are introduced into the circulation and often lead to acute renal failure and vascular dysfunction. Interestingly, the study of chemically modified Hb for use as oxygen therapeutics has allowed for some basic understanding of extracellular Hb toxicity, particularly in the absence of functional clearance mechanisms and in circulatory antioxidant depleted states.
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Affiliation(s)
- Paul W Buehler
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892, USA.
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Lu N, Zhou G, Pei D, Yi L, Gao Z. Peroxynitrite and heme protein – Mediated nitrative/oxidative modification of human plasma protein: The role of free radical scavenging vs. complex forming. Toxicol In Vitro 2009; 23:1227-33. [DOI: 10.1016/j.tiv.2009.07.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2009] [Revised: 06/03/2009] [Accepted: 07/30/2009] [Indexed: 10/20/2022]
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Jia Y, Alayash AI. Effects of (-)-epigallocatechin gallate on the redox reactions of human hemoglobin. Free Radic Biol Med 2008; 45:659-66. [PMID: 18539156 DOI: 10.1016/j.freeradbiomed.2008.05.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Revised: 04/21/2008] [Accepted: 05/15/2008] [Indexed: 01/31/2023]
Abstract
The toxicity of acellular hemoglobin (Hb)-based therapeutics has been attributed in part to the uncontrolled oxidative reactions. A variety of antioxidant strategies to ameliorate potential oxidative damage in vivo have been suggested. We have examined the effects of (-)-epigallocatechin gallate (EGCG), a green tea polyphenol compound widely regarded as a chain-breaking antioxidant, on the oxidative stability of diaspirin crosslinked Hb (DBBF) and its cytotoxic ferryl intermediate. DBBF (ferrous) was rapidly oxidized to the ferric form in the presence of EGCG relative to the normal spontaneous oxidation of this Hb. The fast elimination of ferrous Hb is probably due to the ability of EGCG to produce hydrogen peroxide (H2O2) as these reactions were almost completely reversed by the addition of catalase and superoxide dismutase to the reaction medium. EGCG, however, effectively reduced ferryl back to ferric Hb in a biphasic kinetic reaction at physiological pH. At acidic pH where the autoreduction of protonated ferryl Hb is enhanced, a monophasic reduction process of the ferryl heme is achieved. A balance between pro and antioxidant properties of EGCG should be taken into account if EGCG is used in combination therapy with redox active acellular Hbs.
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Affiliation(s)
- Yiping Jia
- Laboratory of Biochemistry and Vascular Biology, Division of Hematology, Center for Biologics Evaluation and Research, Food and Drug Administration, National Institutes of Health Campus, Bethesda, MD 20892, USA.
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Reeder BJ, Grey M, Silaghi-Dumitrescu RL, Svistunenko DA, Bülow L, Cooper CE, Wilson MT. Tyrosine residues as redox cofactors in human hemoglobin: implications for engineering nontoxic blood substitutes. J Biol Chem 2008; 283:30780-7. [PMID: 18728007 DOI: 10.1074/jbc.m804709200] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Respiratory proteins such as myoglobin and hemoglobin can, under oxidative conditions, form ferryl heme iron and protein-based free radicals. Ferryl myoglobin can safely be returned to the ferric oxidation state by electron donation from exogenous reductants via a mechanism that involves two distinct pathways. In addition to direct transfer between the electron donor and ferryl heme edge, there is a second pathway that involves "through-protein" electron transfer via a tyrosine residue (tyrosine 103, sperm whale myoglobin). Here we show that the heterogeneous subunits of human hemoglobin, the alpha and beta chains, display significantly different kinetics for ferryl reduction by exogenous reductants. By using selected hemoglobin mutants, we show that the alpha chain possesses two electron transfer pathways, similar to myoglobin. Furthermore, tyrosine 42 is shown to be a critical component of the high affinity, through-protein electron transfer pathway. We also show that the beta chain of hemoglobin, lacking the homologous tyrosine, does not possess this through-protein electron transfer pathway. However, such a pathway can be engineered into the protein by mutation of a specific phenylalanine residue to a tyrosine. High affinity through-protein electron transfer pathways, whether native or engineered, enhance the kinetics of ferryl removal by reductants, particularly at low reductant concentrations. Ferryl iron has been suggested to be a major cause of the oxidative toxicity of hemoglobin-based blood substitutes. Engineering hemoglobin with enhanced rates of ferryl removal, as we show here, is therefore likely to result in molecules better suited for in vivo oxygen delivery.
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Affiliation(s)
- Brandon J Reeder
- Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK.
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Cooper CE, Silaghi-Dumitrescu R, Rukengwa M, Alayash AI, Buehler PW. Peroxidase activity of hemoglobin towards ascorbate and urate: a synergistic protective strategy against toxicity of Hemoglobin-Based Oxygen Carriers (HBOC). BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2008; 1784:1415-20. [PMID: 18457681 DOI: 10.1016/j.bbapap.2008.03.019] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 02/29/2008] [Accepted: 03/25/2008] [Indexed: 11/30/2022]
Abstract
Acellular hemoglobins developed as oxygen bridging agents with volume expanding properties ("blood substitutes") are prone to autoxidation and oxidant-mediated structural changes in circulation. In the presence of hydrogen peroxide and either ascorbate or urate we show that ferric hemoglobin functions as a true enzymatic peroxidase. The activity saturates with both substrates and is linearly dependent on protein concentration. The activity is enhanced at low pH with a pKa of 4.7, consistent with protonation of the ferryl species (Fe(IV)-OH) as the active intermediate. To test whether these redox reactions define its behaviour in vivo we exchanged transfused guinea pigs with 50% polymerized bovine Hb (PolyHbBv) and monitored plasma levels of endogenous ascorbate and urate. Immediately after transfusion, met PolyHbBv levels increased up to 30% of total Hb and remained at this level during the first 24 h post transfusion. Plasma ascorbate decreased by 50% whereas urate levels remained unchanged after transfusion. A simple kinetic model, assuming that ascorbate was a more active ferric heme reductase and peroxidase substrate than urate, was consistent with the in vivo data. The present finding confirms the primary and secondary roles of ascorbate and urate respectively in maintaining the oxidative stability of infused Hb.
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Affiliation(s)
- Chris E Cooper
- Department of Biological Sciences, University of Essex, Colchester, CO4 3SQ UK.
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