1
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Cai B, Huang P, Fang Y, Tian H. Recyclable and Stable Porphyrin-Based Self-Assemblies by Electrostatic Force for Efficient Photocatalytic Organic Transformation. Adv Sci (Weinh) 2024:e2308469. [PMID: 38460154 DOI: 10.1002/advs.202308469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/19/2024] [Indexed: 03/11/2024]
Abstract
Development of efficient, stable, and recyclable photocatalysts for organic synthesis is vital for transformation of traditional thermal organic chemistry into green sustainable organic chemistry. In this work, the study reports an electrostatic approach to assemble meso-tetra (4-sulfonate phenyl) porphyrin (TPPS)tetra (4-sulfonate phenyl) porphyrin (TPPS) as a donor and benzyl viologen (BV) as an acceptor into stable and recyclable photocatalyst for an efficient organic transformation reaction - aryl sulfide oxidation. By use of the electrostatic TPPS-BV photocatalysts, 0.1 mmol aryl sulfide with electron-donating group can be completely transformed into aryl sulfoxide in 60 min without overoxidation into sulfone, rendering near 100% yield and selectivity. The photocatalyst can be recycled up to 95% when 10 mg amount is used. Mechanistic study reveals that efficient charge separation between TPPS and BV results in sufficient formation of superoxide which further reacts with the oxidized sulfide by the photocatalyst to produce the sulfoxide. This mechanistic pathway differs significantly from the previously proposed singlet oxygen-dominated process in homogeneous TPPS photocatalysis.
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Affiliation(s)
- Bin Cai
- Department of Chemistry-Ångström Lab, Uppsala University, Box 523, Uppsala, SE 751 20, Sweden
| | - Ping Huang
- Department of Chemistry-Ångström Lab, Uppsala University, Box 523, Uppsala, SE 751 20, Sweden
| | - Yuan Fang
- Department of Chemistry, KTH Royal Institute of Technology, Teknikringen 30-36, Stockholm, SE 100 44, Sweden
| | - Haining Tian
- Department of Chemistry-Ångström Lab, Uppsala University, Box 523, Uppsala, SE 751 20, Sweden
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2
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Uruk G, Mocanu E, Shaw AE, Bamburg JR, Swanson RA. Cofilactin rod formation mediates inflammation-induced neurite degeneration. Cell Rep 2024; 43:113914. [PMID: 38451813 DOI: 10.1016/j.celrep.2024.113914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 01/17/2024] [Accepted: 02/19/2024] [Indexed: 03/09/2024] Open
Abstract
Stroke, trauma, and neurodegenerative disorders cause loss of neurites (axons and dendrites) in addition to neuronal death. Neurite loss may result directly from a primary insult, secondary to parental neuron death, or secondary to a post-injury inflammatory response. Here, we use lipopolysaccharide and the alarmin S100β to selectively evaluate neurite loss caused by the inflammatory response. Activation of microglia and infiltrating macrophages by these stimuli causes neurite loss that far exceeds neuronal death, both in vitro and in vivo. Neurite loss is accompanied by the formation of cofilactin rods and aggregates (CARs), which are polymers of cofilin-1 and actin induced by oxidative stress and other factors. Mice deficient in either cofilin-1 or the superoxide-generating enzyme NADPH oxidase-2 show reduced CAR formation, neurite loss, and motor impairment. The findings identify a mechanism by which inflammation leads to neurite loss via CAR formation and highlight the relevance of neurite loss to functional impairment.
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Affiliation(s)
- Gökhan Uruk
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Neurology Service, San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA
| | - Ebony Mocanu
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Neurology Service, San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA
| | - Alisa E Shaw
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO, USA
| | - James R Bamburg
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO, USA
| | - Raymond A Swanson
- Department of Neurology, University of California, San Francisco, San Francisco, CA, USA; Neurology Service, San Francisco Veterans Affairs Health Care System, San Francisco, CA, USA.
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3
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Yang Z, Marcoci C, Öztürk HK, Giama E, Yenicelik AG, Slanař O, Linington C, Desai R, Smith KJ. Tissue Hypoxia and Associated Innate Immune Factors in Experimental Autoimmune Optic Neuritis. Int J Mol Sci 2024; 25:3077. [PMID: 38474322 DOI: 10.3390/ijms25053077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 03/03/2024] [Accepted: 03/04/2024] [Indexed: 03/14/2024] Open
Abstract
Visual loss in acute optic neuritis is typically attributed to axonal conduction block due to inflammatory demyelination, but the mechanisms remain unclear. Recent research has highlighted tissue hypoxia as an important cause of neurological deficits and tissue damage in both multiple sclerosis (MS) and experimental autoimmune encephalomyelitis (EAE) and, here, we examine whether the optic nerves are hypoxic in experimental optic neuritis induced in Dark Agouti rats. At both the first and second peaks of disease expression, inflamed optic nerves labelled significantly for tissue hypoxia (namely, positive for hypoxia inducible factor-1α (HIF1α) and intravenously administered pimonidazole). Acutely inflamed nerves were also labelled significantly for innate markers of oxidative and nitrative stress and damage, including superoxide, nitric oxide and 3-nitrotyrosine. The density and diameter of capillaries were also increased. We conclude that in acute optic neuritis, the optic nerves are hypoxic and come under oxidative and nitrative stress and damage. Tissue hypoxia can cause mitochondrial failure and thus explains visual loss due to axonal conduction block. Tissue hypoxia can also induce a damaging oxidative and nitrative environment. The findings indicate that treatment to prevent tissue hypoxia in acute optic neuritis may help to restore vision and protect from damaging reactive oxygen and nitrogen species.
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Affiliation(s)
- Zhiyuan Yang
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
| | - Cristina Marcoci
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
| | - Hatice Kübra Öztürk
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
- Institute of Pharmacology, First Faculty of Medicine, Charles University and General University Hospital in Prague, 12800 Prague, Czech Republic
| | - Eleni Giama
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
| | - Ayse Gertrude Yenicelik
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
| | - Ondřej Slanař
- Institute of Pharmacology, First Faculty of Medicine, Charles University and General University Hospital in Prague, 12800 Prague, Czech Republic
| | - Christopher Linington
- School of Infection and Immunity, The Sir Graeme Davies Building, Glasgow G12 8TA, UK
| | - Roshni Desai
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
| | - Kenneth J Smith
- Department of Neuroinflammation, UCL Queen Square Institute of Neurology, University College London, London WC1N 1PJ, UK
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4
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Casella AC, Prolo C, Pereyra J, Ríos N, Piacenza L, Radi R, Álvarez MN. Superoxide, nitric oxide and peroxynitrite production by macrophages under different physiological oxygen tensions. Free Radic Biol Med 2024; 212:330-335. [PMID: 38141888 DOI: 10.1016/j.freeradbiomed.2023.12.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 12/05/2023] [Accepted: 12/16/2023] [Indexed: 12/25/2023]
Abstract
Macrophages count on two O2-consuming enzymes to form reactive radical species: NAPDH oxidase 2 (Nox2) and nitric oxide synthase 2 (inducible isoform, iNOS) that produce superoxide radical (O2•-) and nitric oxide (•NO), respectively. If formed simultaneously, the diffusion-controlled reaction of O2•- and •NO yields peroxynitrite, a potent cytotoxic oxidant. In human tissues and cells, the oxygen partial pressure (pO2) normally ranges within 2-14 %, with a typical average pO2 value for most tissues ca. 5 %. Given that O2 is a substrate for both Nox2 and iNOS, its tissue and cellular concentration can affect O2•- and •NO production. Also, O2 is a modulator of the macrophage adaptative response and may influence iNOS expression in a hypoxia inducible factor 1-α (HIF1α-)-dependent manner. However, most of the reported experiments in cellula, analyzing the formation and effects of O2•- and •NO during macrophage activation and cytotoxicity towards pathogens, have been performed in cells exposed to atmospheric air supplemented with 5 % CO2; under these conditions, most cells are exposed to supraphysiologic oxygen tensions (ca. 20 % O2) which are far from the physiological pO2. Here, the role of O2 as substrate in the oxidative response of J774A.1 macrophages was explored upon exposure to different pO2 and O2•- and •NO formation rates were measured, obtaining a KM of 26 and 42 μM O2 for Nox2 and iNOS, respectively. Consequently, peroxynitrite formation was influenced by pO2, reaching a maximum at ≥ 10 % O2, but even at levels as low as 2 % O2, a substantial formation rate of this oxidant was detected. Indeed, the cytotoxic capacity of immunostimulated macrophages against the intracellular parasite T. cruzi was significant, even at low pO2 values, confirming the role of peroxynitrite as a potent oxidizing cytotoxin within a wide range of physiological oxygen tensions.
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Affiliation(s)
- Ana Clara Casella
- Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Carolina Prolo
- Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Josefina Pereyra
- Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Natalia Ríos
- Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Lucía Piacenza
- Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Rafael Radi
- Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
| | - María Noel Álvarez
- Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay; Departamento de Educación Médica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
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Konjalwar S, Ceyhan B, Rivera O, Nategh P, Neghabi M, Pavlovic M, Allani S, Ranji M. Demonstrating drug treatment efficacies by monitoring superoxide dynamics in human lung cancer cells with time-lapse fluorescence microscopy. J Biophotonics 2024; 17:e202300331. [PMID: 37822188 DOI: 10.1002/jbio.202300331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 10/02/2023] [Accepted: 10/05/2023] [Indexed: 10/13/2023]
Abstract
Metformin hydrochloride, an antihyperglycemic agent, and sulindac, a nonsteroidal anti-inflammatory drug, are FDA-approved drugs known to exert anticancer effects. Previous studies demonstrated sulindac and metformin's anticancer properties through mitochondrial dysfunction and inhibition of mitochondrial electron transport chain complex I and key signaling pathways. In this study, various drugs were administered to A549 lung cancer cells, and results revealed that a combination of sulindac and metformin enhanced cell death compared to the administration of the drugs separately. To measure superoxide production over time, we employed a time-lapse fluorescence imaging technique using mitochondrial-targeted hydroethidine. Fluorescence microscopy data showed the most significant increases in superoxide production in the combination treatment of metformin and sulindac. Results showed significant differences between the combined drug treatment and control groups and between the positive control and control groups. This approach can be utilized to quantify the anticancer efficacy of drugs, creating possibilities for additional therapeutic options.
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Affiliation(s)
- Shalaka Konjalwar
- Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, Florida, USA
| | - Busenur Ceyhan
- Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, Florida, USA
| | - Oscar Rivera
- Center for Molecular Biology and Biotechnology, Florida Atlantic University, Boca Raton, Florida, USA
| | - Parisa Nategh
- Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, Florida, USA
| | - Mehrnoosh Neghabi
- Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, Florida, USA
| | - Mirjana Pavlovic
- Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, Florida, USA
| | - Shailaja Allani
- Center for Molecular Biology and Biotechnology, Florida Atlantic University, Boca Raton, Florida, USA
| | - Mahsa Ranji
- Department of Electrical Engineering and Computer Science, Florida Atlantic University, Boca Raton, Florida, USA
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6
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Paul BD, Pieper AA. Neuroprotective Roles of the Biliverdin Reductase-A/Bilirubin Axis in the Brain. Biomolecules 2024; 14:155. [PMID: 38397392 PMCID: PMC10887292 DOI: 10.3390/biom14020155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 02/25/2024] Open
Abstract
Biliverdin reductase-A (BVRA) is a multi-functional enzyme with a multitude of important roles in physiologic redox homeostasis. Classically, BVRA is well known for converting the heme metabolite biliverdin to bilirubin, which is a potent antioxidant in both the periphery and the brain. However, BVRA additionally participates in many neuroprotective signaling cascades in the brain that preserve cognition. Here, we review the neuroprotective roles of BVRA and bilirubin in the brain, which together constitute a BVRA/bilirubin axis that influences healthy aging and cognitive function.
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Affiliation(s)
- Bindu D. Paul
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- The Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Lieber Institute for Brain Development, Baltimore, MD 21205, USA
| | - Andrew A. Pieper
- Department of Psychiatry, Case Western Reserve University, Cleveland, OH 44106, USA
- Brain Health Medicines Center, Harrington Discovery Institute, University Hospitals Cleveland Medical Center, Cleveland, OH 44106, USA
- Geriatric Psychiatry, GRECC, Louis Stokes Cleveland VA Medical Center, Cleveland, OH 44106, USA
- Institute for Transformative Molecular Medicine, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Pathology, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
- Department of Neurosciences, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
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7
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Foyer CH, Kunert K. The ascorbate/glutathione cycle coming of age. J Exp Bot 2024:erae023. [PMID: 38243395 DOI: 10.1093/jxb/erae023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Indexed: 01/21/2024]
Abstract
Concepts, regarding the operation of the ascorbate/glutathione cycle and the associated water/water cycle in the processing of metabolically-generated hydrogen peroxide and other forms of reactive oxygen species (ROS), are well established in the literature. However, our knowledge of functions of these cycles and their component enzymes continues to grow and evolve. Recent insights include participation in the intrinsic environmental and developmental signaling pathways that regulate plant growth, development and defense. In addition to ROS processing, the enzymes of the two cycles not only support the functions of ascorbate and glutathione, they also have "moonlighting" functions. They are subject to post-translational modifications and have an extensive interactome, particularly with other signaling proteins. In this assessment of current knowledge, we highlight the central position of the ascorbate/glutathione cycle in the network of cellular redox systems that underpin the energy-sensitive communication within the different cellular compartments and integrate plant signalling pathways.
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Affiliation(s)
- Christine H Foyer
- School of Biosciences, College of Life and Environmental Sciences, University of Birmingham, Edgbaston, B15 2TT, United Kingdom
| | - Karl Kunert
- Department of Plant Sciences, FABI, University of Pretoria, Pretoria, 2001, South Africa
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8
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KrishnaPriya S, Nair PS, Bhalla P, Karunagaran D, Suraishkumar GK. Shear stress and microRNAs for better metastatic cancer management. Biotechnol Prog 2024; 40:e3396. [PMID: 37843824 DOI: 10.1002/btpr.3396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 09/15/2023] [Accepted: 09/24/2023] [Indexed: 10/17/2023]
Abstract
Metastasis is the process by which cancer cells move from the primary location to establish themselves in a new location in the human body. It is still a significant challenge in cancer management because it is responsible for 90% of cancer-related deaths. In this work, we present an idea to use shear stress encountered by all metastasizing cells as an elegant means to deactivate metastasizing cancer cells. Shear-induced ROS and cross-talk between ROS and miRNA play crucial roles in deactivating metastasizing cancer cells. In addition, there exists a vast therapeutic potential for miRNAs. Therefore, this study explores the effect of shear on miRNAs and reactive oxygen species (ROS), the two molecular mediators in the proposed {shear-stress}-{miRNA}-{metastasizing-cancer-cell-deactivation} approach. In this context, to understand the effect of defined shear on HCT116 colon cancer cells, they were cultivated in a defined shear environment provided by an appropriately designed and fabricated cone-and-plate device. Shear rate affected the culture growth characteristics and the specific intracellular reactive oxygen species level (si-ROS). HCT116 cell growth was observed at 0 and 0.63 s-1 but not at 1.57 s-1 or beyond. Shear rate induced upregulation of the hsa-miR-335-5p but induced downregulation of hsa-miR-34a-5p. Furthermore, the specific levels of hsa-miR-335-5p, hsa-miR-26b-5p, and hsa-miR-34a-5p negatively correlated with specific intracellular (si)-hydroxyl radical levels. In addition, some messenger RNAs (mRNAs) in HCT116 cells showed a differential expression under shear stress, notably the ROS-associated mRNA of PMAIP1. The above miRNAs (and possibly some mRNAs) could be targeted to manage colon cancer metastasis.
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Affiliation(s)
- Siluveru KrishnaPriya
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Building-1, Indian Institute of Technology Madras, Chennai, India
| | - Pallavi S Nair
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Building-1, Indian Institute of Technology Madras, Chennai, India
| | - Prerna Bhalla
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Building-1, Indian Institute of Technology Madras, Chennai, India
| | - D Karunagaran
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Building-1, Indian Institute of Technology Madras, Chennai, India
| | - G K Suraishkumar
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Building-1, Indian Institute of Technology Madras, Chennai, India
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Rossi M, Caruso F, Thieke N, Belli S, Kim A, Damiani E, Morresi C, Bacchetti T. Examining the Antioxidant and Superoxide Radical Scavenging Activity of Anise, (Pimpinella anisum L. Seeds), Esculetin, and 4-Methyl-Esculetin Using X-ray Diffraction, Hydrodynamic Voltammetry and DFT Methods. Pharmaceuticals (Basel) 2023; 17:67. [PMID: 38256900 PMCID: PMC10818671 DOI: 10.3390/ph17010067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 12/19/2023] [Accepted: 12/26/2023] [Indexed: 01/24/2024] Open
Abstract
Pimpinella anisum L., or anise, is a plant that, besides its nutritional value, has been used in traditional medical practices and described in many cultures in the Mediterranean region. A possible reason for anise's therapeutic value is that it contains coumarins, which are known to have many biomedical and antioxidant properties. HPLC analysis in our laboratory of the anise extract shows the presence of the coumarin esculetin. We used a hydrodynamic voltammetry rotating ring-disk electrode (RRDE) method to measure the superoxide scavenging abilities of anise seeds and esculetin, which has marked scavenging activity. A related coumarin, 4-methyl-esculetin, also showed strong antioxidant activity as measured by RRDE. Moreover, this study includes the X-ray crystal structure of esculetin and 4-methyl-esculetin, which reveal the H-bond and the stacking intermolecular interactions of the two coumarins. Coordinates of esculetin crystal structure were used to perform a DFT study to arrive at the mechanism of superoxide scavenging. Besides performing a H(hydroxyl) abstraction in esculetin position 6 by superoxide, the scavenging also includes the presence of a second superoxide radical in a π-π approach. Both rings of esculetin were explored for this attack, but only the pyrone ring was effective. As a result, one product of esculetin scavenging is H2O2 formation, while the second superoxide remains π-π trapped within the pyrone ring to form an esculetin-η-O2 complex. Comparison with other coumarins shows that subtle structural differences in the coumarin framework can imply marked differences in scavenging. For instance, when the catechol moiety of esculetin (position 6,7) is shifted to position 7,8 in 4-methyl-7,8-dihydroxy coumarin, that coumarin shows a superoxide dismutase action, which, beside H2O2 formation, includes the formation and elimination of a molecule of O2. This is in contrast with the products formed through esculetin superoxide scavenging, where a second added superoxide remains trapped, and forms an esculetin-η-O2 complex.
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Affiliation(s)
- Miriam Rossi
- Department of Chemistry, Vassar College, Poughkeepsie, NY 12604, USA; (F.C.); (N.T.)
| | - Francesco Caruso
- Department of Chemistry, Vassar College, Poughkeepsie, NY 12604, USA; (F.C.); (N.T.)
| | - Natalie Thieke
- Department of Chemistry, Vassar College, Poughkeepsie, NY 12604, USA; (F.C.); (N.T.)
| | - Stuart Belli
- Department of Chemistry, Vassar College, Poughkeepsie, NY 12604, USA; (F.C.); (N.T.)
| | - Alana Kim
- Department of Chemistry, Vassar College, Poughkeepsie, NY 12604, USA; (F.C.); (N.T.)
| | - Elisabetta Damiani
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy; (E.D.); (T.B.)
| | - Camilla Morresi
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy; (E.D.); (T.B.)
| | - Tiziana Bacchetti
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy; (E.D.); (T.B.)
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10
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Pan Y, Garg S, Fu QL, Peng J, Yang X, Waite TD. Copper Safeguards Dissolved Organic Matter from Sunlight-Driven Photooxidation. Environ Sci Technol 2023; 57:21178-21189. [PMID: 38064756 DOI: 10.1021/acs.est.3c07549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Sunlight plays a crucial role in the transformation of dissolved organic matter (DOM) and the associated carbon cycle in aquatic environments. This study demonstrates that the presence of nanomolar concentrations of copper (Cu) significantly decreases the rate of photobleaching and the rate of loss of electron-donating moieties of three selected types of DOM (including both terrestrial and microbially derived DOM) under simulated sunlight irradiation. Employing Fourier transform ion cyclotron resonance mass spectrometry, we further confirm that Cu selectively inhibits the photooxidation of lignin- and tannin-like phenolic moieties present within the DOM, in agreement with the reported inhibitory impact of Cu on the photooxidation of phenolic compounds. On the basis of the inhibitory impact of Cu on the DOM photobleaching rate, we calculate the contribution of phenolic moieties to DOM photobleaching to be at least 29-55% in the wavelength range of 220-460 nm. The inhibition of loss of electrons from DOM during irradiation in the presence of Cu is also explained quantitatively by developing a mathematical model describing hydrogen peroxide (a proxy measure of loss of electrons from DOM) formation on DOM irradiation in the absence and presence of Cu. Overall, this study advances our understanding of DOM transformation in natural sunlit waters.
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Affiliation(s)
- Yanheng Pan
- School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Shikha Garg
- School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Qing-Long Fu
- School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
| | - Jianglin Peng
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Xin Yang
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - T David Waite
- School of Civil and Environmental Engineering, The University of New South Wales, Sydney, New South Wales 2052, Australia
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11
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Zhang X, Guo Y, Liu G, Liu Y, Shi J, Hu L, Zhao L, Li Y, Yin Y, Cai Y, Jiang G. Superoxide-Mediated Extracellular Mercury Reduction by Aerobic Marine Bacterium Alteromonas sp. KD01. Environ Sci Technol 2023; 57:20595-20604. [PMID: 38007712 DOI: 10.1021/acs.est.3c04777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
Microbial reduction plays a crucial role in Hg redox and the global cycle. Although intracellular Hg(II) reduction mediated by MerA protein is well documented, it is still unclear whether or how bacteria reduce Hg(II) extracellularly without its internalization. Herein, for the first time, we discovered the extracellular reduction of Hg(II) by a widely distributed aerobic marine bacterium Alteromonas sp. KD01 through a superoxide-dependent mechanism. The generation of superoxide by Alteromonas sp. KD01 was determined using 3-bis(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide and methyl cypridina luciferin analogue as probes via UV-vis and chemiluminescence detection, respectively. The results demonstrated that Hg(II) reduction was inhibited by superoxide scavengers (superoxide dismutase (SOD) and Cu(NO3)2) or inhibitors of reduced nicotinamide adenine dinucleotide (NADH) oxidoreductases. In contrast, the addition of NADH significantly improved superoxide generation and, in turn, Hg(II) reduction. Direct evidence of superoxide-mediated Hg(II) reduction was provided by the addition of superoxide using KO2 in deionized water and seawater. Moreover, we observed that even superoxide at an environmental concentration of 9.6 ± 0.5 nM from Alteromonas sp. KD01 (5.4 × 106 cells mL-1) was capable of significantly reducing Hg(II). Our findings provide a greater understanding of Hg(II) reduction by superoxide from heterotrophic bacteria and eukaryotic phytoplankton in diverse aerobic environments, including surface water, sediment, and soil.
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Affiliation(s)
- Xiaoyan Zhang
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yingying Guo
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Guangliang Liu
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Yanwei Liu
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jianbo Shi
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Ligang Hu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Lixia Zhao
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yanbin Li
- Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education and College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
| | - Yongguang Yin
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- School of Environment, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
| | - Yong Cai
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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12
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Dogsom O, Hamza A, Mahmud S, Min JK, Lee YB, Park JB. The Complex of p-Tyr42 RhoA and p-p65/RelA in Response to LPS Regulates the Expression of Phosphoglycerate Kinase 1. Antioxidants (Basel) 2023; 12:2090. [PMID: 38136210 PMCID: PMC10740983 DOI: 10.3390/antiox12122090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/24/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023] Open
Abstract
Inflammation plays a crucial role in tumorigenesis, primarily mediated by NF-κB. RhoA GTPases are instrumental in regulating the activation of NF-κB. Specifically, the phosphorylation of Tyrosine 42 on RhoA ensures the activation of NF-κB by directly activating the IKKβ associated with IKKγ (NEMO). This study aimed to uncover the molecular mechanism through which p-Tyrosine 42 RhoA, in conjunction with NF-κB, promotes tumorigenesis. Notably, we observed that p-Tyrosine 42 RhoA co-immunoprecipitated with the p-Ser 536 p65/RelA subunit in NF-κB in response to LPS. Moreover, both p-Tyrosine 42 RhoA and p-p65/RelA translocated to the nucleus, where they formed a protein complex associated with the promoter of phosphoglycerate kinase 1 (PGK1) and regulated the expression of PGK1. In addition, p-p65/RelA and p-Tyr42 RhoA co-immunoprecipitated with p300 histone acetyltransferase. Intriguingly, PGK1 exhibited an interaction with β-catenin, PKM1 and PKM2. Of particular interest, si-PGK1 led to a reduction in the levels of β-catenin and phosphorylated pyruvate dehydrogenase A1 (p-PDHA1). We also found that PGK1 phosphorylated β-catenin at the Thr551 and Ser552 residues. These findings discovered that PGK1 may play a role in transcriptional regulation, alongside other transcription factors.
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Affiliation(s)
- Oyungerel Dogsom
- Department of Biochemistry, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (O.D.); (A.H.); (S.M.); (J.-K.M.); (Y.-B.L.)
- Department of Biology, School of Bio-Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar 14210, Mongolia
| | - Amir Hamza
- Department of Biochemistry, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (O.D.); (A.H.); (S.M.); (J.-K.M.); (Y.-B.L.)
| | - Shohel Mahmud
- Department of Biochemistry, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (O.D.); (A.H.); (S.M.); (J.-K.M.); (Y.-B.L.)
- National Institute of Biotechnology, Ganakbari, Ashulia, Savar 1349, Dhaka, Bangladesh
| | - Jung-Ki Min
- Department of Biochemistry, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (O.D.); (A.H.); (S.M.); (J.-K.M.); (Y.-B.L.)
| | - Yoon-Beom Lee
- Department of Biochemistry, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (O.D.); (A.H.); (S.M.); (J.-K.M.); (Y.-B.L.)
| | - Jae-Bong Park
- Department of Biochemistry, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea; (O.D.); (A.H.); (S.M.); (J.-K.M.); (Y.-B.L.)
- Institute of Cell Differentiation and Aging, Hallym University College of Medicine, Hallymdaehag-Gil 1, Chuncheon 24252, Kangwon-do, Republic of Korea
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13
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LAGAL DJ, BÁRCENA JA, REQUEJO-AGUILAR R, PADILLA CA, LETO TL. NOX1 and PRDX6 synergistically support migration and invasiveness of hepatocellular carcinoma cells through enhanced NADPH oxidase activity. Adv Redox Res 2023; 9:100080. [PMID: 37900981 PMCID: PMC10611439 DOI: 10.1016/j.arres.2023.100080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
The NADPH oxidase 1 (NOX1) complex formed by proteins NOX1, p22phox, NOXO1, NOXA1, and RAC1 plays an important role in the generation of superoxide and other reactive oxygen species (ROS) which are involved in normal and pathological cell functions due to their effects on diverse cell signaling pathways. Cell migration and invasiveness are at the origin of tumor metastasis during cancer progression which involves a process of cellular de-differentiation known as the epithelial-mesenchymal transition (EMT). During EMT cells lose their polarized epithelial phenotype and express mesenchymal marker proteins that enable cytoskeletal rearrangements promoting cell migration, expression and activation of matrix metalloproteinases (MMPs), tissue remodeling, and cell invasion during metastasis. In this work, we explored the importance of the peroxiredoxin 6 (PRDX6)-NOX1 enzyme interaction leading to NOXA1 protein stabilization and increased levels of superoxide produced by NOX in hepatocarcinoma cells. This increase was accompanied by higher levels of N-cadherin and MMP2, correlating with a greater capacity for cell migration and invasiveness of SNU475 hepatocarcinoma cells. The increase in superoxide and the associated downstream effects on cancer progression were suppressed when phospholipase A2 or peroxidase activities of PRDX6 were abolished by site-directed mutagenesis, reinforcing the importance of these catalytic activities in supporting NOX1-based superoxide generation. Overall, these results demonstrate a clear functional cooperation between NOX1 and PRDX6 catalytic activities which generate higher levels of ROS production, resulting in a more aggressive tumor phenotype.
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Affiliation(s)
- Daniel J. LAGAL
- Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health. Bethesda, MD, USA
- University of Córdoba, Biochemistry and Molecular Biology Department. Córdoba, Spain
| | - J. Antonio BÁRCENA
- University of Córdoba, Biochemistry and Molecular Biology Department. Córdoba, Spain
- Maimónides Biomedical Research Institute of Córdoba (IMIBIC), Spain
| | - Raquel REQUEJO-AGUILAR
- University of Córdoba, Biochemistry and Molecular Biology Department. Córdoba, Spain
- Maimónides Biomedical Research Institute of Córdoba (IMIBIC), Spain
| | - C. Alicia PADILLA
- University of Córdoba, Biochemistry and Molecular Biology Department. Córdoba, Spain
- Maimónides Biomedical Research Institute of Córdoba (IMIBIC), Spain
| | - Thomas L. LETO
- Laboratory of Clinical Immunology and Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health. Bethesda, MD, USA
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14
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Yang Y, Li J, Li C, Gong M, Wang X, Yang X, Wang H, Li YF, Liu ZP. The Identity of Nickel Peroxide as a Nickel Superoxyhydroxide for Enhanced Electrocatalysis. JACS Au 2023; 3:2964-2972. [PMID: 38034951 PMCID: PMC10685415 DOI: 10.1021/jacsau.3c00245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 10/18/2023] [Accepted: 10/20/2023] [Indexed: 12/02/2023]
Abstract
Nickel peroxides are a class of stoichiometric oxidants that can selectively oxidize various organic compounds, but their molecular level structure remained elusive until now. Herein, we utilized structural prediction using the Stochastic Surface Walking method based on a neural network potential energy surface and advanced characterization using the as-synthesized nickel peroxide to unravel its chemical identity as the bridging superoxide containing nickel hydroxide, or nickel superoxyhydroxide. Superoxide incorporation tunes the local chemical environment of nickel and oxygen beyond the conventional Bode plot, offering a 6.4-fold increase in the electrocatalytic activity of urea oxidation. A volcanic dependence of the activity on the oxygen equivalents leads to the proposed active site of the Ni(OO)(OH)Ni five-membered ring. This work not only unveils the possible structures of nickel peroxides but also emphasizes the significance of tailoring the oxygen environment for advanced catalysis.
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Affiliation(s)
- Yizhou Yang
- School
of Mechanical and Power Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - Jili Li
- Department
of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and
Innovative Materials, Fudan University, Shanghai 200438, P. R. China
| | - Chong Li
- School
of Mechanical and Power Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - Ming Gong
- Department
of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and
Innovative Materials, Fudan University, Shanghai 200438, P. R. China
| | - Xue Wang
- School
of Mechanical and Power Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - Xuejing Yang
- School
of Mechanical and Power Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - Hualin Wang
- School
of Mechanical and Power Engineering, East
China University of Science and Technology, Shanghai 200237, China
| | - Ye-Fei Li
- Department
of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and
Innovative Materials, Fudan University, Shanghai 200438, P. R. China
- Key
Laboratory of Computational Physical Science, Fudan University, Shanghai 200438, P. R.
China
| | - Zhi-Pan Liu
- Department
of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and
Innovative Materials, Fudan University, Shanghai 200438, P. R. China
- Key
Laboratory of Computational Physical Science, Fudan University, Shanghai 200438, P. R.
China
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15
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Pal R, Hui D, Menchen H, Zhao H, Mozziconacci O, Wilkins H, Blagg BSJ, Schöneich C, Swerdlow RH, Michaelis ML, Michaelis EK. Protection against Aβ-induced neuronal damage by KU-32: PDHK1 inhibition as important target. Front Aging Neurosci 2023; 15:1282855. [PMID: 38035268 PMCID: PMC10682733 DOI: 10.3389/fnagi.2023.1282855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/23/2023] [Indexed: 12/02/2023] Open
Abstract
A feature of most neurodegenerative diseases is the presence of "mis-folded proteins" that form aggregates, suggesting suboptimal activity of neuronal molecular chaperones. Heat shock protein 90 (Hsp90) is the master regulator of cell responses to "proteotoxic" stresses. Some Hsp90 modulators activate cascades leading to upregulation of additional chaperones. Novobiocin is a modulator at the C-terminal ATP-binding site of Hsp90. Of several novobiocin analogs synthesized and tested for protection against amyloid beta (Aβ)-induced neuronal death, "KU-32" was the most potent in protecting primary neurons, but did not increase expression of other chaperones believed to help clear misfolded proteins. However, KU-32 reversed Aβ-induced superoxide formation, activated Complex I of the electron transfer chain in mitochondria, and blocked the Aβ-induced inhibition of Complex I in neuroblastoma cells. A mechanism for these effects of KU-32 on mitochondrial metabolism appeared to be the inhibition of pyruvate dehydrogenase kinase (PDHK), both in isolated brain mitochondria and in SH-SY5Y cells. PDHK inhibition by the classic enzyme inhibitor, dichloroacetate, led to neuroprotection from Aβ25-35-induced cell injury similarly to KU-32. Inhibition of PDHK in neurons would lead to activation of the PDH complex, increased acetyl-CoA generation, stimulation of the tricarboxylic acid cycle and Complex I in the electron transfer chain, and enhanced oxidative phosphorylation. A focus of future studies may be on the potential value of PDHK as a target in AD therapy.
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Affiliation(s)
- Ranu Pal
- Higuchi Biosciences Center, University of Kansas, Lawrence, KS, United States
| | - Dongwei Hui
- Higuchi Biosciences Center, University of Kansas, Lawrence, KS, United States
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, United States
| | - Heather Menchen
- Higuchi Biosciences Center, University of Kansas, Lawrence, KS, United States
| | - Huiping Zhao
- Department of Medicinal Chemistry, University of Kansas, Lawrence, KS, United States
| | - Olivier Mozziconacci
- University of Kansas Alzheimer’s Disease Research Center, University of Kansas Medical Center, Kansas City, KS, United States
| | - Heather Wilkins
- University of Kansas Alzheimer’s Disease Research Center, University of Kansas Medical Center, Kansas City, KS, United States
| | - Brian S. J. Blagg
- Department of Medicinal Chemistry, University of Kansas, Lawrence, KS, United States
- Department of Chemistry and Biochemistry, University of Notre Dame, South Bend, IN, United States
| | - Christian Schöneich
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, United States
| | - Russell H. Swerdlow
- University of Kansas Alzheimer’s Disease Research Center, University of Kansas Medical Center, Kansas City, KS, United States
| | - Mary L. Michaelis
- Higuchi Biosciences Center, University of Kansas, Lawrence, KS, United States
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, United States
- University of Kansas Alzheimer’s Disease Research Center, University of Kansas Medical Center, Kansas City, KS, United States
| | - Elias K. Michaelis
- Higuchi Biosciences Center, University of Kansas, Lawrence, KS, United States
- Department of Pharmaceutical Chemistry, University of Kansas, Lawrence, KS, United States
- University of Kansas Alzheimer’s Disease Research Center, University of Kansas Medical Center, Kansas City, KS, United States
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16
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Alruwaili N, Kandhi S, Froogh G, Kelly MR, Sun D, Wolin MS. Superoxide-Mediated Upregulation of MMP9 Participates in BMPR2 Destabilization and Pulmonary Hypertension Development. Antioxidants (Basel) 2023; 12:1961. [PMID: 38001814 PMCID: PMC10669489 DOI: 10.3390/antiox12111961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/25/2023] [Accepted: 10/31/2023] [Indexed: 11/26/2023] Open
Abstract
BACKGROUND AND AIMS we previously reported in studies on organoid-cultured bovine pulmonary arteries that pulmonary hypertension (PH) conditions of exposure to hypoxia or endothelin-1 caused a loss of a cartilage oligomeric matrix protein (COMP) stabilization of bone morphogenetic protein receptor-2 (BMPR2) function, a known key process contributing to pulmonary hypertension development. Based on subsequent findings, these conditions were associated with an extracellular superoxide-mediated increase in matrix metalloproteinase 9 (MMP-9) expression. We investigated if this contributed to PH development using mice deficient in MMP9. RESULTS wild-type (WT) mice exposed to Sugen/Hypoxia (SuHx) to induce PH had increased levels of MMP9 in their lungs. Hemodynamic measures from MMP9 knockout mice (MMP9 KO) indicated they had attenuated PH parameters compared to WT mice based on an ECHO assessment of pulmonary artery pressure, right ventricular systolic pressure, and Fulton index hypertrophy measurements. In vitro vascular reactivity studies showed impaired endothelium-dependent and endothelium-independent NO-associated vasodilatory responses in the pulmonary arteries of SuHx mice and decreased lung levels of COMP and BMPR2 expression. These changes were attenuated in MMP9 KO mice potentially through preserving COMP-dependent stabilization of BMPR2. INNOVATION this study supports a new function of superoxide in increasing MMP9 and the associated impairment of BMPR2 in promoting PH development which could be a target for future therapies. CONCLUSION superoxide, through promoting increases in MMP9, mediates BMPR2 depletion and its consequent control of vascular function in response to PH mediators and the SuHx mouse model of PH.
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Affiliation(s)
- Norah Alruwaili
- Department of Physiology, New York Medical College, Valhalla, NY 10595, USA; (N.A.); (D.S.)
- Department of Basic Sciences, College of Science and Health Professions, King Saud Bin Abdulaziz for Health Sciences, Riyadh 11481, Saudi Arabia
| | - Sharath Kandhi
- Department of Physiology, New York Medical College, Valhalla, NY 10595, USA; (N.A.); (D.S.)
| | - Ghezal Froogh
- Department of Physiology, New York Medical College, Valhalla, NY 10595, USA; (N.A.); (D.S.)
| | - Melissa R. Kelly
- Department of Physiology, New York Medical College, Valhalla, NY 10595, USA; (N.A.); (D.S.)
| | - Dong Sun
- Department of Physiology, New York Medical College, Valhalla, NY 10595, USA; (N.A.); (D.S.)
| | - Michael S. Wolin
- Department of Physiology, New York Medical College, Valhalla, NY 10595, USA; (N.A.); (D.S.)
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17
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Taenzer L, Wankel SD, Kapit J, Pardis WA, Herrera S, Auscavitch S, Grabb KC, Cordes E, Hansel CM. Corals and sponges are hotspots of reactive oxygen species in the deep sea. PNAS Nexus 2023; 2:pgad398. [PMID: 38034097 PMCID: PMC10682969 DOI: 10.1093/pnasnexus/pgad398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Accepted: 11/01/2023] [Indexed: 12/02/2023]
Abstract
Reactive oxygen species (ROS) are central to diverse biological processes through which organisms respond to and interact with their surroundings. Yet, a lack of direct measurements limits our understanding of the distribution of ROS in the ocean. Using a recently developed in situ sensor, we show that deep-sea corals and sponges produce the ROS superoxide, revealing that benthic organisms can be sources and hotspots of ROS production in these environments. These findings confirm previous contentions that extracellular superoxide production by corals can be independent of the activity of photosynthetic symbionts. The discovery of deep-sea corals and sponges as sources of ROS has implications for the physiology and ecology of benthic organisms and introduces a previously overlooked suite of redox reactants at depth.
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Affiliation(s)
- Lina Taenzer
- Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
- Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Scott D Wankel
- Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
| | - Jason Kapit
- Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
| | - William A Pardis
- Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
| | - Santiago Herrera
- Department of Biological Sciences, Lehigh University, Bethlehem, PA 18015, USA
| | | | - Kalina C Grabb
- Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
- Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Erik Cordes
- Department of Biology, Temple University, Philadelphia, PA 19122, USA
| | - Colleen M Hansel
- Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
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18
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Carbone M, Mathieu B, Vandensande Y, Gallez B. Impact of Exposure to Pyraclostrobin and to a Pyraclostrobin/Boscalid Mixture on the Mitochondrial Function of Human Hepatocytes. Molecules 2023; 28:7013. [PMID: 37894492 PMCID: PMC10609024 DOI: 10.3390/molecules28207013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 09/29/2023] [Accepted: 10/08/2023] [Indexed: 10/29/2023] Open
Abstract
Fungicides are widely used in agriculture for crop protection. Succinate dehydrogenase inhibitors (SDHIs) and strobilurins inhibit mitochondria electron transport chain (ETC) in fungi, by blocking complex II and complex III, respectively. Questions regarding their selectivity of action for fungi have been raised in the literature, and we previously showed that boscalid and bixafen (SDHIs) alter the mitochondrial function of human hepatocytes. Here, we analyzed the impact of the exposure of human hepatocytes to pyraclostrobin, a fungicide belonging to the class of strobilurins. Using electron paramagnetic resonance (EPR), we observed a decrease in oxygen consumption rate (OCR) and an increase in mitochondrial superoxide levels after 24 h exposure to 0.5 µM concentration. As a consequence, the content in ATP amount in the cells was reduced, the ratio reduced/oxidized glutathione was decreased, and a decrease in cell viability was observed using three different assays (PrestoBlue, crystal violet, and annexin V assays). In addition, as SDHIs and strobilurins are commonly associated in commercial preparations, we evaluated a potential "cocktail" toxic effect. We selected low concentrations of boscalid (0.5 µM) and pyraclostrobin (0.25 µM) that did not induce a mitochondrial dysfunction in liver cells when used separately. In sharp contrast, when both compounds were used in combination at the same concentration, we observed a decrease in OCR, an increase in mitochondrial superoxide production, a decrease in the ratio reduced/oxidized glutathione, and a decrease in cell viability in three different assays.
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Affiliation(s)
| | | | | | - Bernard Gallez
- Biomedical Magnetic Resonance Research Group, Louvain Drug Research Institute, Université Catholique de Louvain (UCLouvain), Avenue Mounier 73.08, B-1200 Brussels, Belgium; (M.C.); (B.M.); (Y.V.)
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19
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Vojta L, Rac-Justament A, Zechmann B, Fulgosi H. Thylakoid Rhodanese-like Protein-Ferredoxin:NADP + Oxidoreductase Interaction Is Integrated into Plant Redox Homeostasis System. Antioxidants (Basel) 2023; 12:1838. [PMID: 37891917 PMCID: PMC10604066 DOI: 10.3390/antiox12101838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 09/27/2023] [Accepted: 10/05/2023] [Indexed: 10/29/2023] Open
Abstract
In vascular plants, the final photosynthetic electron transfer from ferredoxin (Fd) to NADP+ is catalyzed by the flavoenzyme ferredoxin:NADP+ oxidoreductase (FNR). FNR is recruited to thylakoid membranes via an integral membrane protein TROL (thylakoid rhodanese-like protein) and the membrane associated protein Tic62. We have previously demonstrated that the absence of TROL triggers a very efficient superoxide (O2•-) removal mechanism. The dynamic TROL-FNR interaction has been shown to be an apparently overlooked mechanism that maintains linear electron flow before alternative pathway(s) is(are) activated. In this work, we aimed to further test our hypothesis that the FNR-TROL pair could be the source element that triggers various downstream networks of chloroplast ROS scavenging. Tandem affinity purification followed by the MS analysis confirmed the TROL-FNR interaction and revealed possible interaction of TROL with the thylakoid form of the enzyme ascorbate peroxidase (tAPX), which catalyzes the H2O2-dependent oxidation of ascorbate and is, therefore, the crucial component of the redox homeostasis system in plants. Further, EPR analyses using superoxide spin trap DMPO showed that, in comparison with the wild type, plants overexpressing TROL (TROL OX) propagate more O2•- when exposed to high light stress. This indicates an increased sensitivity to oxidative stress in conditions when there is an excess of membrane-bound FNR and less free FNR is found in the stroma. Finally, immunohistochemical analyses of glutathione in different Arabidopsis leaf cell compartments showed highly elevated glutathione levels in TROL OX, indicating an increased demand for this ROS scavenger in these plants, likely needed to prevent the damage of important cellular components caused by reactive oxygen species.
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Affiliation(s)
- Lea Vojta
- Laboratory for Molecular Plant Biology and Biotechnology, Division of Molecular Biology, Institute Ruđer Bošković, Bijenička cesta 54, HR-10000 Zagreb, Croatia
| | - Anja Rac-Justament
- Laboratory for Molecular Plant Biology and Biotechnology, Division of Molecular Biology, Institute Ruđer Bošković, Bijenička cesta 54, HR-10000 Zagreb, Croatia
| | - Bernd Zechmann
- Center for Microscopy and Imaging (CMI), Baylor University, One Bear Place #97046, Waco, TX 76798-7046, USA
| | - Hrvoje Fulgosi
- Laboratory for Molecular Plant Biology and Biotechnology, Division of Molecular Biology, Institute Ruđer Bošković, Bijenička cesta 54, HR-10000 Zagreb, Croatia
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20
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Sulicka-Grodzicka J, Szczepaniak P, Jozefczuk E, Urbanski K, Siedlinski M, Niewiara Ł, Guzik B, Filip G, Kapelak B, Wierzbicki K, Korkosz M, Guzik TJ, Mikolajczyk TP. Systemic and local vascular inflammation and arterial reactive oxygen species generation in patients with advanced cardiovascular diseases. Front Cardiovasc Med 2023; 10:1230051. [PMID: 37745103 PMCID: PMC10513373 DOI: 10.3389/fcvm.2023.1230051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Accepted: 08/28/2023] [Indexed: 09/26/2023] Open
Abstract
Background Systemic inflammation may cause endothelial activation, mediate local inflammation, and accelerate progression of atherosclerosis. We examined whether the levels of circulating inflammatory cytokines reflect local vascular inflammation and oxidative stress in two types of human arteries. Methods Human internal mammary artery (IMA) was obtained in 69 patients undergoing coronary artery bypass graft (CABG) surgery and left anterior descending (LAD) artery was obtained in 17 patients undergoing heart transplantation (HTx). Plasma levels of tumor necrosis factor α (TNF-α), interleukin-6 (IL-6) and interleukin-1β (IL-1β) were measured using ELISA, high-sensitivity C-reactive protein (hs-CRP) was measured using Luminex, and mRNA expression of proinflammatory cytokines in the vascular tissues was assessed. Furthermore, formation of superoxide anion was measured in segments of IMA using 5 uM lucigenin-dependent chemiluminescence. Vascular reactivity was measured using tissue organ bath system. Results TNF-α, IL-6 and IL-1β mRNAs were expressed in all studied IMA and LAD segments. Plasma levels of inflammatory cytokines did not correlate with vascular cytokine mRNA expression neither in IMA nor in LAD. Plasma TNF-α and IL-6 correlated with hs-CRP level in CABG group. Hs-CRP also correlated with TNF-α in HTx group. Neither vascular TNF-α, IL-6 and IL-1β mRNA expression, nor systemic levels of either TNF-α, IL-6 and IL-1β were correlated with superoxide generation in IMAs. Interestingly, circulating IL-1β negatively correlated with maximal relaxation of the internal mammary artery (r = -0.37, p = 0.004). At the same time the mRNA expression of studied inflammatory cytokines were positively associated with each other in both IMA and LAD. The positive correlations were observed between circulating levels of IL-6 and TNF-α in CABG cohort and IL-6 and IL-1β in HTx cohort. Conclusions This study shows that peripheral inflammatory cytokine measurements may not reflect local vascular inflammation or oxidative stress in patients with advanced cardiovascular disease (CVD). Circulating pro-inflammatory cytokines generally correlated positively with each other, similarly their mRNA correlated in the arterial wall, however, these levels were not correlated between the studied compartments.
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Affiliation(s)
- Joanna Sulicka-Grodzicka
- Department of Rheumatology and Immunology, Jagiellonian University Medical College, Krakow, Poland
- School of Infection and Immunity, University of Glasgow, Glasgow, United Kingdom
| | - Piotr Szczepaniak
- Department of Internal and Agricultural Medicine, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
| | - Ewelina Jozefczuk
- Department of Internal and Agricultural Medicine, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
| | - Karol Urbanski
- Department of Internal and Agricultural Medicine, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
| | - Mateusz Siedlinski
- Department of Internal and Agricultural Medicine, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
| | - Łukasz Niewiara
- Department of Interventional Cardiology, Jagiellonian University Medical College, John Paul II Hospital, Kraków, Poland
| | - Bartłomiej Guzik
- Department of Interventional Cardiology, Jagiellonian University Medical College, John Paul II Hospital, Kraków, Poland
| | - Grzegorz Filip
- Department of Cardiovascular Surgery and Transplantology, Jagiellonian University, John Paul II Hospital, Krakow, Poland
| | - Bogusław Kapelak
- Department of Cardiovascular Surgery and Transplantology, Jagiellonian University, John Paul II Hospital, Krakow, Poland
| | - Karol Wierzbicki
- Department of Cardiovascular Surgery and Transplantology, Jagiellonian University, John Paul II Hospital, Krakow, Poland
| | - Mariusz Korkosz
- Department of Rheumatology and Immunology, Jagiellonian University Medical College, Krakow, Poland
| | - Tomasz J. Guzik
- Department of Internal and Agricultural Medicine, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
- BHF Centre for Research Excellence, Centre for Cardiovascular Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Tomasz P. Mikolajczyk
- School of Infection and Immunity, University of Glasgow, Glasgow, United Kingdom
- Department of Internal and Agricultural Medicine, Faculty of Medicine, Jagiellonian University Medical College, Krakow, Poland
- Center for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
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21
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Mapuskar KA, Pulliam CF, Zepeda-Orozco D, Griffin BR, Furqan M, Spitz DR, Allen BG. Redox Regulation of Nrf2 in Cisplatin-Induced Kidney Injury. Antioxidants (Basel) 2023; 12:1728. [PMID: 37760031 PMCID: PMC10525889 DOI: 10.3390/antiox12091728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/30/2023] [Accepted: 09/03/2023] [Indexed: 09/29/2023] Open
Abstract
Cisplatin, a potent chemotherapeutic agent, is marred by severe nephrotoxicity that is governed by mechanisms involving oxidative stress, inflammation, and apoptosis pathways. The transcription factor Nrf2, pivotal in cellular defense against oxidative stress and inflammation, is the master regulator of the antioxidant response, upregulating antioxidants and cytoprotective genes under oxidative stress. This review discusses the mechanisms underlying chemotherapy-induced kidney injury, focusing on the role of Nrf2 in cancer therapy and its redox regulation in cisplatin-induced kidney injury. We also explore Nrf2's signaling pathways, post-translational modifications, and its involvement in autophagy, as well as examine redox-based strategies for modulating Nrf2 in cisplatin-induced kidney injury while considering the limitations and potential off-target effects of Nrf2 modulation. Understanding the redox regulation of Nrf2 in cisplatin-induced kidney injury holds significant promise for developing novel therapeutic interventions. This knowledge could provide valuable insights into potential strategies for mitigating the nephrotoxicity associated with cisplatin, ultimately enhancing the safety and efficacy of cancer treatment.
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Affiliation(s)
- Kranti A. Mapuskar
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals & Clinics, Iowa City, IA 52242, USA
| | - Casey F. Pulliam
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals & Clinics, Iowa City, IA 52242, USA
| | - Diana Zepeda-Orozco
- Pediatric Nephrology and Hypertension at Nationwide Children’s Hospital, Columbus, OH 43205, USA
- Kidney and Urinary Tract Center, Abigail Wexner Research Institute, Nationwide Children’s Hospital, Columbus, OH 43205, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Benjamin R. Griffin
- Division of Nephrology, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
- Department of Internal Medicine, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Muhammad Furqan
- Department of Internal Medicine, The University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Douglas R. Spitz
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals & Clinics, Iowa City, IA 52242, USA
| | - Bryan G. Allen
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals & Clinics, Iowa City, IA 52242, USA
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Zhang F, Dong X, Wang Y, Lang X. Design and Synthesis of a Triazine-Based sp 2 Carbon-Conjugated Covalent Organic Framework for Blue Light Photocatalysis. Small 2023; 19:e2302456. [PMID: 37196416 DOI: 10.1002/smll.202302456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 04/18/2023] [Indexed: 05/19/2023]
Abstract
Fully conjugated covalent organic frameworks (COFs) can exhibit great potential in semiconductor photocatalysis. But their syntheses remain elusive due to the low reversibility of vinylene linkage. Herein, by tuning the amount of base and temperature, a novel triazine-based sp2 carbon-conjugated COF (TA-sp2 c-COF) is successfully constructed over Cs2 CO3 . Besides, the influence of modulating factors on the chemical and optoelectronic properties of TA-sp2 c-COF is thoroughly investigated. TA-sp2 c-COF adopts an eclipsed AA stacking structure with uniform micropores (1.4 nm). The blue light photocatalysis of the highly crystalline TA-sp2 c-COF is established for the selective oxidative coupling of amines with oxygen, and the predominant role of superoxide is identified in forming imines. This work foretells that meticulous modulation of reaction conditions is the key to constructing sp2 carbon-conjugated COFs toward solar photocatalysis.
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Affiliation(s)
- Fulin Zhang
- Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xiaoyun Dong
- Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Yuexin Wang
- Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xianjun Lang
- Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
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Bvindi C, Howe K, Wang Y, Mullen RT, Rogan CJ, Anderson JC, Goyer A. Potato Non-Specific Lipid Transfer Protein StnsLTPI.33 Is Associated with the Production of Reactive Oxygen Species, Plant Growth, and Susceptibility to Alternaria solani. Plants (Basel) 2023; 12:3129. [PMID: 37687375 PMCID: PMC10490331 DOI: 10.3390/plants12173129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/21/2023] [Accepted: 08/29/2023] [Indexed: 09/10/2023]
Abstract
Plant non-specific lipid transfer proteins (nsLTPs) are small proteins capable of transferring phospholipids between membranes and binding non-specifically fatty acids in vitro. They constitute large gene families in plants, e.g., 83 in potato (Solanum tuberosum). Despite their recognition decades ago, very few have been functionally characterized. Here, we set out to better understand the function of one of the potato members, StnsLTPI.33. Using quantitative polymerase chain reaction, we show that StnsLTPI.33 is expressed throughout the potato plant, but at relatively higher levels in roots and leaves compared to petals, anthers, and the ovary. We also show that ectopically-expressed StnsLTPI.33 fused to green fluorescent protein colocalized with an apoplastic marker in Nicotiana benthamiana leaves, indicating that StnsLTPI.33 is targeted to the apoplast. Constitutive overexpression of the StnsLTPI.33 gene in potato led to increased levels of superoxide anions and reduced plant growth, particularly under salt stress conditions, and enhanced susceptibility to Alternaria solani. In addition, StnsLTPI.33-overexpressing plants had a depleted leaf pool of pipecolic acid, threonic acid, and glycine, while they accumulated putrescine. To our knowledge, this is the first report of an nsLTP that is associated with enhanced susceptibility to a pathogen in potato.
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Affiliation(s)
- Carol Bvindi
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA; (C.B.); (K.H.); (C.J.R.); (J.C.A.)
| | - Kate Howe
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA; (C.B.); (K.H.); (C.J.R.); (J.C.A.)
| | - You Wang
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.W.); (R.T.M.)
| | - Robert T. Mullen
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON N1G 2W1, Canada; (Y.W.); (R.T.M.)
| | - Conner J. Rogan
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA; (C.B.); (K.H.); (C.J.R.); (J.C.A.)
| | - Jeffrey C. Anderson
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA; (C.B.); (K.H.); (C.J.R.); (J.C.A.)
| | - Aymeric Goyer
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331, USA; (C.B.); (K.H.); (C.J.R.); (J.C.A.)
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Haigh S, Brown ZL, Shivers MA, Sellers HG, West MA, Barman SA, Stepp DW, Csanyi G, Fulton DJR. A Reappraisal of the Utility of L-012 to Measure Superoxide from Biologically Relevant Sources. Antioxidants (Basel) 2023; 12:1689. [PMID: 37759992 PMCID: PMC10525458 DOI: 10.3390/antiox12091689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 08/21/2023] [Accepted: 08/25/2023] [Indexed: 09/29/2023] Open
Abstract
The detection of superoxide anion (O2●-) in biological tissues remains challenging. Barriers to convenient and reproducible measurements include expensive equipment, custom probes, and the need for high sensitivity and specificity. The luminol derivative, L-012, has been used to measure O2●- since 1993 with mixed results and concerns over specificity. The goal of this study was to better define the conditions for use and their specificity. We found that L-012 coupled with depolymerized orthovanadate, a relatively impermeable tyrosine phosphatase inhibitor, yielded a highly sensitive approach to detect extracellular O2●-. In O2●- producing HEK-NOX5 cells, orthovanadate increased L-012 luminescence 100-fold. The combination of L-012 and orthovanadate was highly sensitive, stable, scalable, completely reversed by superoxide dismutase, and selective for O2●- generating NOXes versus NOX4, which produces H2O2. Moreover, there was no signal from cells transfected with NOS3 (NO●) and NOS2(ONOO-). To exclude the effects of altered tyrosine phosphorylation, O2●- was detected using non-enzymatic synthesis with phenazine methosulfate and via novel coupling of L-012 with niobium oxalate, which was less active in inducing tyrosine phosphorylation. Overall, our data shows that L-012 coupled with orthovanadate or other periodic group 5 salts yields a reliable, sensitive, and specific approach to measuring extracellular O2●- in biological systems.
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Affiliation(s)
- Stephen Haigh
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - Zach L. Brown
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - Mitch A. Shivers
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - Hunter G. Sellers
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - Madison A. West
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - Scott A. Barman
- Department of Pharmacology and Toxicology, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - David W. Stepp
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - Gabor Csanyi
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
- Department of Pharmacology and Toxicology, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
| | - David J. R. Fulton
- Vascular Biology Center, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
- David Fulton Vascular Biology Center, Department of Pharmacology and Toxicology, Medical College of Georgia at Augusta University, 1460 Laney Walker Blvd, CB 3316, Augusta, GA 30909, USA
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Juric M, Rawat V, Amaradhi R, Zielonka J, Ganesh T. Novel NADPH Oxidase-2 Inhibitors as Potential Anti-Inflammatory and Neuroprotective Agents. Antioxidants (Basel) 2023; 12:1660. [PMID: 37759963 PMCID: PMC10525516 DOI: 10.3390/antiox12091660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/12/2023] [Accepted: 08/18/2023] [Indexed: 09/29/2023] Open
Abstract
A family of seven NADPH oxidase enzymes (Nox1-5, Duox1-2) has been implicated in a variety of diseases, including inflammatory lung diseases, neurodegenerative diseases, cardiovascular diseases, and cancer. Here, we report the results of our studies aimed at developing novel brain-permeable Nox2 inhibitors with potential application as neuroprotective agents. Using cell-based assays, we identified a novel Nox2 inhibitor, TG15-132, that prevents PMA-stimulated oxygen consumption and reactive oxygen species (superoxide radical anion and hydrogen peroxide) formation upon acute treatment in differentiated HL60 cells. Long-term treatment with TG15-132 attenuates the induction of genes encoding Nox2 subunits, several inflammatory cytokines, and iNOS in differentiated THP-1 cells. Moreover, TG15-132 shows a relatively long plasma half-life (5.6 h) and excellent brain permeability, with a brain-to-plasma ratio (>5-fold) in rodent models. Additionally, TG15-132 does not cause any toxic effects on vital organs or blood biomarkers of toxicity in mice upon chronic dosing for seven days. We propose that TG15-132 may be used as a Nox2 inhibitor and a potential neuroprotective agent, with possible further structural modifications to increase its potency.
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Affiliation(s)
- Matea Juric
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI 53226, USA;
| | - Varun Rawat
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA; (V.R.); (R.A.)
| | - Radhika Amaradhi
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA; (V.R.); (R.A.)
| | - Jacek Zielonka
- Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI 53226, USA;
| | - Thota Ganesh
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine, Atlanta, GA 30322, USA; (V.R.); (R.A.)
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Dontsov AE, Yakovleva MA, Vasin AA, Gulin AA, Aybush AV, Nadtochenko VA, Ostrovsky MA. Understanding the Mechanism of Light-Induced Age-Related Decrease in Melanin Concentration in Retinal Pigment Epithelium Cells. Int J Mol Sci 2023; 24:13099. [PMID: 37685907 PMCID: PMC10487480 DOI: 10.3390/ijms241713099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Revised: 08/13/2023] [Accepted: 08/18/2023] [Indexed: 09/10/2023] Open
Abstract
It is known that during the process of aging, there is a significant decrease in the number of melanosomes in the retinal pigment epithelium (RPE) cells in the human eye. Melanosomes act as screening pigments in RPE cells and are fundamentally important for protection against the free radicals generated by light. A loss or change in the quality of melanin in melanosomes can lead to the development of senile pathologies and aggravation in the development of various retinal diseases. We have previously shown that the interaction between melanin melanosomes and superoxide radicals results in oxidative degradation with the formation of water-soluble fluorescent products. In the present study, we show, using fluorescence analysis, HPLC, and mass spectrometry, that visible light irradiation on melanolipofuscin granules isolated from RPE cells in the human eye results in the formation of water-soluble fluorescent products from oxidative degradation of melanin, which was in contrast to lipofuscin granules and melanosomes irradiation. The formation of these products occurs as a result of the oxidative degradation of melanin by superoxide radicals, which are generated by the lipofuscin part of the melanolipofuscin granule. We identified these products both in the composition of melanolipofuscin granules irradiated with visible light and in the composition of melanosomes that were not irradiated but were, instead, oxidized by superoxide radicals. In the melanolipofuscin granules irradiated by visible light, ions that could be associated with melanin oxidative degradation products were identified by applying the principal component analysis of the time-of-flight secondary ion mass spectrometry (ToF-SIMS) data. Degradation of the intact melanosomes by visible light is also possible; however, this requires significantly higher irradiation intensities than for melanolipofuscin granules. It is concluded that the decrease in the concentration of melanin in RPE cells in the human eye with age is due to its oxidative degradation by reactive oxygen species generated by lipofuscin, as part of the melanolipofuscin granules, under the action of light.
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Affiliation(s)
- Alexander E. Dontsov
- Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia; (M.A.Y.); (M.A.O.)
| | - Marina A. Yakovleva
- Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia; (M.A.Y.); (M.A.O.)
| | - Alexander A. Vasin
- Federal Research Center of Chemical Physics, Russian Academy of Sciences, N.N. Semenov RAS, 119991 Moscow, Russia; (A.A.V.); (A.A.G.); (A.V.A.); (V.A.N.)
| | - Alexander A. Gulin
- Federal Research Center of Chemical Physics, Russian Academy of Sciences, N.N. Semenov RAS, 119991 Moscow, Russia; (A.A.V.); (A.A.G.); (A.V.A.); (V.A.N.)
| | - Arseny V. Aybush
- Federal Research Center of Chemical Physics, Russian Academy of Sciences, N.N. Semenov RAS, 119991 Moscow, Russia; (A.A.V.); (A.A.G.); (A.V.A.); (V.A.N.)
| | - Viktor A. Nadtochenko
- Federal Research Center of Chemical Physics, Russian Academy of Sciences, N.N. Semenov RAS, 119991 Moscow, Russia; (A.A.V.); (A.A.G.); (A.V.A.); (V.A.N.)
| | - Mikhail A. Ostrovsky
- Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334 Moscow, Russia; (M.A.Y.); (M.A.O.)
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Rothwell JG, Hong J, Morrison SJ, Vyas HKN, Xia B, Mai-Prochnow A, McConchie R, Phan-Thien KY, Cullen PJ, Carter DA. An Effective Sanitizer for Fresh Produce Production: In Situ Plasma-Activated Water Treatment Inactivates Pathogenic Bacteria and Maintains the Quality of Cucurbit Fruit. Microbiol Spectr 2023; 11:e0003423. [PMID: 37428084 PMCID: PMC10434273 DOI: 10.1128/spectrum.00034-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 06/18/2023] [Indexed: 07/11/2023] Open
Abstract
The effect of plasma-activated water (PAW) generated with a dielectric barrier discharge diffusor (DBDD) system on microbial load and organoleptic quality of cucamelons was investigated and compared to the established sanitizer, sodium hypochlorite (NaOCl). Pathogenic serotypes of Escherichia coli, Salmonella enterica, and Listeria monocytogenes were inoculated onto the surface of cucamelons (6.5 log CFU g-1) and into the wash water (6 log CFU mL-1). PAW treatment involved 2 min in situ with water activated at 1,500 Hz and 120 V and air as the feed gas; NaOCl treatment was a wash with 100 ppm total chlorine; control treatment was a wash with tap water. PAW treatment produced a 3-log CFU g-1 reduction of pathogens on the cucamelon surface without negatively impacting quality or shelf life. NaOCl treatment reduced the pathogenic bacteria on the cucamelon surface by 3 to 4 log CFU g-1; however, this treatment also reduced fruit shelf life and quality. Both systems reduced 6-log CFU mL-1 pathogens in the wash water to below detectable limits. The critical role of superoxide anion radical (·O2-) in the antimicrobial power of DBDD-PAW was demonstrated through a Tiron scavenger assay, and chemistry modeling confirmed that ·O2- generation readily occurs in DBDD-PAW generated with the employed settings. Modeling of the physical forces produced during plasma treatment showed that bacteria likely experience strong local electric fields and polarization. We hypothesize that these physical effects synergize with reactive chemical species to produce the acute antimicrobial activity seen with the in situ PAW system. IMPORTANCE Plasma-activated water (PAW) is an emerging sanitizer in the fresh food industry, where food safety must be achieved without a thermal kill step. Here, we demonstrate PAW generated in situ to be a competitive sanitizer technology, providing a significant reduction of pathogenic and spoilage microorganisms while maintaining the quality and shelf life of the produce item. Our experimental results are supported by modeling of the plasma chemistry and applied physical forces, which show that the system can generate highly reactive ·O2- and strong electric fields that combine to produce potent antimicrobial power. In situ PAW has promise in industrial applications as it requires only low power (12 W), tap water, and air. Moreover, it does not produce toxic by-products or hazardous effluent waste, making it a sustainable solution for fresh food safety.
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Affiliation(s)
- Joanna G. Rothwell
- ARC Training Centre for Food Safety in the Fresh Produce Industry, School of Life and Environmental Sciences, Faculty of Science, Sydney Institute of Agriculture, The University of Sydney, Sydney, New South Wales, Australia
| | - Jungmi Hong
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, Australia
| | - Stuart J. Morrison
- Department of Agricultural and Resource Economics, University of California, Davis, California, USA
| | - Heema Kumari Nilesh Vyas
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, Australia
- Sydney Institute of Infectious Diseases, The University of Sydney, Sydney, New South Wales, Australia
| | - Binbin Xia
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, Australia
| | - Anne Mai-Prochnow
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, Australia
| | - Robyn McConchie
- ARC Training Centre for Food Safety in the Fresh Produce Industry, School of Life and Environmental Sciences, Faculty of Science, Sydney Institute of Agriculture, The University of Sydney, Sydney, New South Wales, Australia
| | - Kim-Yen Phan-Thien
- ARC Training Centre for Food Safety in the Fresh Produce Industry, School of Life and Environmental Sciences, Faculty of Science, Sydney Institute of Agriculture, The University of Sydney, Sydney, New South Wales, Australia
| | - Patrick J. Cullen
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales, Australia
| | - Dee A. Carter
- ARC Training Centre for Food Safety in the Fresh Produce Industry, School of Life and Environmental Sciences, Faculty of Science, Sydney Institute of Agriculture, The University of Sydney, Sydney, New South Wales, Australia
- Sydney Institute of Infectious Diseases, The University of Sydney, Sydney, New South Wales, Australia
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Volkov V, Lobanov A, Voronkov M, Baygildiev T, Misin V, Tsivileva O. Kinetics and Mechanism of Epinephrine Autoxidation in the Presence of Plant Superoxide Inhibitors: A New Look at the Methodology of Using a Model System in Biological and Chemical Research. Antioxidants (Basel) 2023; 12:1530. [PMID: 37627525 PMCID: PMC10451219 DOI: 10.3390/antiox12081530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/18/2023] [Accepted: 07/26/2023] [Indexed: 08/27/2023] Open
Abstract
Superoxide is the primary active oxygen form produced in living organisms. Because of superoxide anion radical formation during epinephrine oxidation in alkaline medium, this system is offered in some works for antioxidant activity analysis, however, without enough physicochemical justification. Therefore, the task of developing reliable methods for analyzing the superoxide inhibition activity of various objects is very urgent. In this work, a kinetic model of epinephrine autoxidation in an alkaline medium in the presence of antioxidants of plant origin is proposed. The participation of chain reactions with long oxidation chains in this process is revealed. The limiting stage of the process is a one-electron reduction of oxygen by the anionic forms of the phenolic hydroxyls of epinephrine. The appearance of the absorption maximum at a wavelength of 347 nm during epinephrine autoxidation is associated with adrenolutin formation, which is confirmed by HPLC/UV/MS. No adduct formation between phenolic antioxidants and epinephrine oxidation products was found. The complex U-shaped character of epinephrine autoxidation rate dependence on the content of antioxidants in the reaction system was shown. The study of the kinetics of epinephrine autoxidation in the presence of an individual phenolic plant superoxide inhibitor, chlorogenic acid, was carried out for the first time. The inhibitory effect of yarrow, chamomile, and bur beggar-ticks plant extracts in the adrenaline system was examined.
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Affiliation(s)
- Vladimir Volkov
- Laboratory of Chemistry of Antioxidants, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow 119334, Russia; (M.V.); (V.M.)
| | - Anton Lobanov
- Department of Dynamics of Chemical and Biological Processes, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow 119991, Russia;
| | - Mikhail Voronkov
- Laboratory of Chemistry of Antioxidants, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow 119334, Russia; (M.V.); (V.M.)
| | - Timur Baygildiev
- Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskie Gory, Moscow 119991, Russia;
- Amsterdam Institute for Life and Environment (A-LIFE), Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
| | - Vyacheslav Misin
- Laboratory of Chemistry of Antioxidants, N.M. Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 4 Kosygin Street, Moscow 119334, Russia; (M.V.); (V.M.)
| | - Olga Tsivileva
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences (IBPPM RAS), 13 Prospekt Entuziastov, Saratov 410049, Russia
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29
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Mavridi-Printezi A, Mollica F, Lucernati R, Montalti M, Amorati R. Insight into the Antioxidant Activity of 1,8-Dihydroxynaphthalene Allomelanin Nanoparticles. Antioxidants (Basel) 2023; 12:1511. [PMID: 37627506 PMCID: PMC10451768 DOI: 10.3390/antiox12081511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 07/21/2023] [Accepted: 07/25/2023] [Indexed: 08/27/2023] Open
Abstract
Melanins are stable and non-toxic pigments with great potential as chemopreventive agents against oxidative stress for medical and cosmetic applications. Allomelanin is a class of nitrogen-free melanin often found in fungi. The artificial allomelanin obtained by the polymerization of 1,8-dihydroxynaphthalene (DHN), poly-DHN (PDHN), has been recently indicated as a better radical quencher than polydopamine (PDA), a melanin model obtained by the polymerization of dopamine (DA); however, the chemical mechanisms underlying this difference are unclear. Here we investigate, by experimental and theoretical methods, the ability of PDHN nanoparticles (PDHN-NP), in comparison to PDA-NP, to trap alkylperoxyl (ROO•) and hydroperoxyl (HOO•) radicals that are involved in the propagation of peroxidation in real conditions. Our results demonstrate that PDHN-NP present a higher antioxidant efficiency with respect to PDA-NP against ROO• in water at pH 7.4 and against mixed ROO• and HOO• in acetonitrile, showing catalytic cross-termination activity. The antioxidant capacity of PDHN-NP in water is 0.8 mmol/g (ROO• radicals quenched by 1 g of PDHN-NP), with a rate constant of 3 × 105 M-1 s-1 for each reactive moiety. Quantum-mechanical calculations revealed that, thanks to the formation of a H-bond network, the quinones in PDHN-NP have a high affinity for H-atoms, thus justifying the high reactivity of PDHN-NP with HOO• observed experimentally.
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Affiliation(s)
| | | | | | - Marco Montalti
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via Selmi 2, 40126 Bologna, Italy; (A.M.-P.); (F.M.)
| | - Riccardo Amorati
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via Selmi 2, 40126 Bologna, Italy; (A.M.-P.); (F.M.)
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30
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Hancock JT. Are Protein Cavities and Pockets Commonly Used by Redox Active Signalling Molecules? Plants (Basel) 2023; 12:2594. [PMID: 37514209 PMCID: PMC10383989 DOI: 10.3390/plants12142594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/23/2023] [Accepted: 07/05/2023] [Indexed: 07/30/2023]
Abstract
It has been well known for a long time that inert gases, such as xenon (Xe), have significant biological effects. As these atoms are extremely unlikely to partake in direct chemical reactions with biomolecules such as proteins, lipids, and nucleic acids, there must be some other mode of action to account for the effects reported. It has been shown that the topology of proteins allows for cavities and hydrophobic pockets, and it is via an interaction with such protein structures that inert gases are thought to have their action. Recently, it has been mooted that the relatively inert gas molecular hydrogen (H2) may also have its effects via such a mechanism, influencing protein structures and actions. H2 is thought to also act via interaction with redox active compounds, particularly the hydroxyl radical (·OH) and peroxynitrite (ONOO-), but not nitric oxide (NO·), superoxide anions (O2·-) or hydrogen peroxide (H2O2). However, instead of having a direct interaction with H2, is there any evidence that these redox compounds can also interact with Xe pockets and cavities in proteins, either having an independent effect on proteins or interfering with the action of inert gases? This suggestion will be explored here.
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Affiliation(s)
- John T Hancock
- School of Applied Sciences, University of the West of England, Bristol BS16 1QY, UK
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31
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Scocozza M, Vieyra F, Battaglini F, Martins LO, Murgida DH. Electrochemical Actuation of a DyP Peroxidase: A Facile Method for Drastic Improvement of the Catalytic Performance. ACS Catal 2023; 13:7437-7449. [PMID: 37288089 PMCID: PMC10243304 DOI: 10.1021/acscatal.3c01530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 04/20/2023] [Indexed: 06/09/2023]
Abstract
Dye decolorizing peroxidases (DyP) have attracted interest for applications such as dye-containing wastewater remediation and biomass processing. So far, efforts to improve operational pH ranges, activities, and stabilities have focused on site-directed mutagenesis and directed evolution strategies. Here, we show that the performance of the DyP from Bacillus subtilis can be drastically boosted without the need for complex molecular biology procedures by simply activating the enzyme electrochemically in the absence of externally added H2O2. Under these conditions, the enzyme shows specific activities toward a variety of chemically different substrates that are significantly higher than in its canonical operation. Moreover, it presents much broader pH activity profiles with the maxima shifted toward neutral to alkaline. We also show that the enzyme can be successfully immobilized on biocompatible electrodes. When actuated electrochemically, the enzymatic electrodes have two orders of magnitude higher turnover numbers than with the standard H2O2-dependent operation and preserve about 30% of the initial electrocatalytic activity after 5 days of operation-storage cycles.
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Affiliation(s)
- Magalí
F. Scocozza
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
- Instituto
de Química Física de Los Materiales, Medio Ambiente
y Energía (INQUIMAE), CONICET-Universidad
de Buenos Aires, Buenos Aires C1428EGA, Argentina
| | - Francisco Vieyra
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
- Instituto
de Química Física de Los Materiales, Medio Ambiente
y Energía (INQUIMAE), CONICET-Universidad
de Buenos Aires, Buenos Aires C1428EGA, Argentina
| | - Fernando Battaglini
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
- Instituto
de Química Física de Los Materiales, Medio Ambiente
y Energía (INQUIMAE), CONICET-Universidad
de Buenos Aires, Buenos Aires C1428EGA, Argentina
| | - Ligia O. Martins
- Instituto
de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Oeiras 2780-157, Portugal
| | - Daniel H. Murgida
- Departamento
de Química Inorgánica, Analítica y Química
Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires C1428EGA, Argentina
- Instituto
de Química Física de Los Materiales, Medio Ambiente
y Energía (INQUIMAE), CONICET-Universidad
de Buenos Aires, Buenos Aires C1428EGA, Argentina
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Sołtysik BK, Karolczak K, Kostka T, Stephenson SS, Watala C, Kostka J. Contribution of Physical Activity to the Oxidative and Antioxidant Potential in 60-65-Year-Old Seniors. Antioxidants (Basel) 2023; 12:1200. [PMID: 37371930 DOI: 10.3390/antiox12061200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 05/19/2023] [Accepted: 05/30/2023] [Indexed: 06/29/2023] Open
Abstract
Both acute exercise and regular physical activity (PA) are directly related to the redox system. However, at present, there are data suggesting both positive and negative relationships between the PA and oxidation. In addition, there is a limited number of publications differentiating the relationships between PA and numerous markers of plasma and platelets targets for the oxidative stress. In this study, in a population of 300 participants from central Poland (covering the age range between 60 and 65 years), PA was assessed as regards energy expenditure (PA-EE) and health-related behaviors (PA-HRB). Total antioxidant potential (TAS), total oxidative stress (TOS) and several other markers of an oxidative stress, monitored in platelet and plasma lipids and proteins, were then determined. The association of PA with oxidative stress was determined taking into the account basic confounders, such as age, sex and the set of the relevant cardiometabolic factors. In simple correlations, platelet lipid peroxides, free thiol and amino groups of platelet proteins, as well as the generation of superoxide anion radical, were inversely related with PA-EE. In multivariate analyses, apart from other cardiometabolic factors, a significant positive impact of PA-HRB was revealed for TOS (inverse relationship), while in the case of PA-EE, the effect was found to be positive (inverse association) for lipid peroxides and superoxide anion but negative (lower concentration) for free thiol and free amino groups in platelets proteins. Therefore, the impact of PA may be different on oxidative stress markers in platelets as compared to plasma proteins and also dissimilar on platelet lipids and proteins. These associations are more visible for platelets than plasma markers. For lipid oxidation, PA seems to have protective effect. In the case of platelets proteins, PA tends to act as pro-oxidative factor.
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Affiliation(s)
- Bartłomiej K Sołtysik
- Department of Geriatrics, Medical University of Lodz, Haller Square No. 1, 90-419 Łódź, Poland
| | - Kamil Karolczak
- Department of Hemostatic Disorders, Medical University of Lodz, Mazowiecka Street 6/8, 92-215 Łódź, Poland
| | - Tomasz Kostka
- Department of Geriatrics, Medical University of Lodz, Haller Square No. 1, 90-419 Łódź, Poland
| | - Serena S Stephenson
- Department of Geriatrics, Medical University of Lodz, Haller Square No. 1, 90-419 Łódź, Poland
| | - Cezary Watala
- Department of Hemostatic Disorders, Medical University of Lodz, Mazowiecka Street 6/8, 92-215 Łódź, Poland
| | - Joanna Kostka
- Department of Gerontology, Medical University of Lodz, Milionowa Street No. 14, 93-113 Łódź, Poland
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33
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Mapuskar KA, Vasquez-Martinez G, Mayoral-Andrade G, Tomanek-Chalkley A, Zepeda-Orozco D, Allen BG. Mitochondrial Oxidative Metabolism: An Emerging Therapeutic Target to Improve CKD Outcomes. Biomedicines 2023; 11:1573. [PMID: 37371668 DOI: 10.3390/biomedicines11061573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/15/2023] [Accepted: 05/19/2023] [Indexed: 06/29/2023] Open
Abstract
Chronic kidney disease (CKD) predisposes one toward end-stage renal disease (ESRD) and its associated morbidity and mortality. Significant metabolic perturbations in conjunction with alterations in redox status during CKD may induce increased production of reactive oxygen species (ROS), including superoxide (O2●-) and hydrogen peroxide (H2O2). Increased O2●- and H2O2 may contribute to the overall progression of renal injury as well as catalyze the onset of comorbidities. In this review, we discuss the role of mitochondrial oxidative metabolism in the pathology of CKD and the recent developments in treating CKD progression specifically targeted to the mitochondria. Recently published results from a Phase 2b clinical trial by our group as well as recently released data from a ROMAN: Phase 3 trial (NCT03689712) suggest avasopasem manganese (AVA) may protect kidneys from cisplatin-induced CKD. Several antioxidants are under investigation to protect normal tissues from cancer-therapy-associated injury. Although many of these antioxidants demonstrate efficacy in pre-clinical models, clinically relevant novel compounds that reduce the severity of AKI and delay the progression to CKD are needed to reduce the burden of kidney disease. In this review, we focus on the various metabolic pathways in the kidney, discuss the role of mitochondrial metabolism in kidney disease, and the general involvement of mitochondrial oxidative metabolism in CKD progression. Furthermore, we present up-to-date literature on utilizing targets of mitochondrial metabolism to delay the pathology of CKD in pre-clinical and clinical models. Finally, we discuss the current clinical trials that target the mitochondria that could potentially be instrumental in advancing the clinical exploration and prevention of CKD.
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Affiliation(s)
- Kranti A Mapuskar
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Gabriela Vasquez-Martinez
- Kidney and Urinary Tract Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA
| | - Gabriel Mayoral-Andrade
- Kidney and Urinary Tract Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA
| | - Ann Tomanek-Chalkley
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
| | - Diana Zepeda-Orozco
- Kidney and Urinary Tract Center, The Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA
- Department of Pediatrics, The Ohio State University, College of Medicine, Columbus, OH 43210, USA
| | - Bryan G Allen
- Free Radical and Radiation Biology Program, Department of Radiation Oncology, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA
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Amić A, Mastiľák Cagardová D. A DFT Study on the Kinetics of HOO •, CH 3OO •, and O 2•- Scavenging by Quercetin and Flavonoid Catecholic Metabolites. Antioxidants (Basel) 2023; 12:1154. [PMID: 37371883 DOI: 10.3390/antiox12061154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2023] [Revised: 05/19/2023] [Accepted: 05/23/2023] [Indexed: 06/29/2023] Open
Abstract
Reaction kinetics have been theoretically examined to ascertain the potency of quercetin (Q) and flavonoid catecholic metabolites 1-5 in the inactivation of HOO•, CH3OO•, and O2•- under physiological conditions. In lipidic media, the koverallTST/Eck rate constants for the proton-coupled electron transfer (PCET) mechanism indicate the catecholic moiety of Q and 1-5 as the most important in HOO• and CH3OO• scavenging. 5-(3,4-Dihydroxyphenyl)-γ-valerolactone (1) and alphitonin (5) are the most potent scavengers of HOO• and CH3OO•, respectively. The koverallMf rate constants, representing actual behavior in aqueous media, reveal Q as more potent in the inactivation of HOO• and CH3OO• via single electron transfer (SET). SET from 3-O- phenoxide anion of Q, a structural motif absent in 1-5, represents the most contributing reaction path to overall activity. All studied polyphenolics have a potency of O2•- inactivation via a concerted two-proton-coupled electron transfer (2PCET) mechanism. The obtained results indicate that metabolites with notable radical scavenging potency, and more bioavailability than ingested flavonoids, may contribute to human health-promoting effects ascribed to parent molecules.
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Affiliation(s)
- Ana Amić
- Department of Chemistry, Josip Juraj Strossmayer University of Osijek, Ulica cara Hadrijana 8A, 31000 Osijek, Croatia
| | - Denisa Mastiľák Cagardová
- Institute of Physical Chemistry and Chemical Physics, Department of Chemical Physics, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia
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35
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Vanreusel I, Taeymans J, Van Craenenbroeck E, Segers VFM, Van Berendoncks A, Briedé JJ, Hens W. Elevated oxidative stress in patients with congenital heart disease and the effect of cyanosis: a meta-analysis. Free Radic Res 2023; 57:470-486. [PMID: 38000042 DOI: 10.1080/10715762.2023.2284639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Accepted: 10/26/2023] [Indexed: 11/26/2023]
Abstract
Oxidative stress is an important pathophysiological mechanism in the development of numerous cardiovascular disorders. To improve therapy and preventive strategies, clinicians need a better understanding of the underlying pathophysiological mechanisms of congenital heart diseases (CHD). The objective of this meta-analysis was to determine whether oxidative stress is elevated in patients with CHD compared to healthy controls, and to evaluate whether a difference in oxidative stress parameters can be observed between patients with cyanotic (cCHD) and acyanotic CHD (aCHD). Therefore, 21 studies investigating oxidative stress in peripheral blood of both children and adults with CHD were reviewed. Different methods to assess the oxidant status were compared and divided into three categories: pro-oxidative or anti-oxidative stress markers and the ratio of pro-to-anti oxidative stress markers. This meta-analysis showed elevated oxidative stress levels in patients with CHD, and more specifically in patients with cCHD. Moreover, this indicates that there could be potential in oxidative stress measurements as a new biomarker of disease severity. Further research will be needed to clarify the exact role of oxidative stress and its contributors in CHD in order to get a better and more in-depth understanding of the underlying pathophysiology of CHD, especially the higher susceptibility of the right ventricle (RV) to progress to heart failure (HF). This could facilitate the development of antioxidant treatments and RV-specific HF therapies, which are necessary to improve survival in these patients and could be of particular importance in cCHD.
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Affiliation(s)
- Inne Vanreusel
- Department of Cardiology, Antwerp University Hospital, Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, Antwerp, Belgium
| | - Jan Taeymans
- Division of Physiotherapy, School of Health Professions, Bern University of Applied Sciences, Bern, Switzerland
- Faculty of Physical Education and Physiotherapy, Vrije Universiteit Brussel, Brussel, Belgium
| | - Emeline Van Craenenbroeck
- Department of Cardiology, Antwerp University Hospital, Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, Antwerp, Belgium
| | - Vincent F M Segers
- Department of Cardiology, Antwerp University Hospital, Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, Antwerp, Belgium
| | - An Van Berendoncks
- Department of Cardiology, Antwerp University Hospital, Edegem, Belgium
- Research Group Cardiovascular Diseases, GENCOR, University of Antwerp, Antwerp, Belgium
| | - Jacob J Briedé
- Department of Toxicogenomics, School of Oncology and Reproduction (GROW), Maastricht University, Maastricht, The Netherlands
| | - Wendy Hens
- Cardiac Rehabilitation Centre, Antwerp University Hospital, Edegem, Belgium
- Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Sciences, MOVANT Research Group, University of Antwerp, Antwerp, Belgium
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36
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Wardman P. Mechanisms of the 'FLASH' effect: radiation chemistry should not be ignored in developing models. Radiother Oncol 2023; 184:109673. [PMID: 37086975 DOI: 10.1016/j.radonc.2023.109673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/05/2023] [Accepted: 04/06/2023] [Indexed: 04/24/2023]
Affiliation(s)
- Peter Wardman
- 20 Highover Park, Amersham, Buckinghamshire HP7 0BN, United Kingdom.
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37
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Xavier MR, Teles GH, de Carvalho JM, Vieira LD, de Barros Pita W, Antonio de Morais M. The antioxidant defence of Dekkera bruxellensis against hydrogen peroxide and its relationship to nitrate metabolism. J Appl Microbiol 2023; 134:7093401. [PMID: 36990643 DOI: 10.1093/jambio/lxad065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 03/22/2023] [Accepted: 03/28/2023] [Indexed: 03/31/2023]
Abstract
AIMS The yeast Dekkera bruxellensis is a Crabtree positive yeast that tends towards the oxidative/respiratory metabolism in aerobiosis. However, it is more sensitive to H2O2 than Saccharomyces cerevisiae. In order to investigate this metabolic paradox, the present work aimed to uncover the biological defence mechanism used by this yeast to tolerate the presence of exogenous H2O2. METHODS AND RESULTS Growth curves and spot tests were performed to establish the values of Minimal Inhibitory Concentration and Minimal Biocidal Concentration of H2O2 for different combinations of carbon and nitrogen sources. Cells in exponential growth phase in different culture conditions were used to measure superoxide and thiols (protein and non-protein), enzyme activities and gene expression. CONCLUSIONS The combination of glutathione peroxidase and sulfhydryl-containing proteins formed the preferred defence mechanism against H2O2, which was more efficiently active under respiratory metabolism. However, the action of this mechanism was suppressed when the cells were metabolising nitrate. Significance and Impact of Study. These results were relevant to figure out the fitness of D. bruxellensis to metabolise industrial substrates containing oxidant molecules, such as molasses and plant hydrolysates, in the presence of cheaper nitrogen source such as nitrate.
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Affiliation(s)
- Mariana Rodrigues Xavier
- Laboratory of Microbial Genetics, Department of Genetics, Federal University of Pernambuco, Recife, Brazil
| | - Gilberto Henrique Teles
- Laboratory of Microbial Genetics, Department of Genetics, Federal University of Pernambuco, Recife, Brazil
| | | | - Leucio Duarte Vieira
- Laboratory of Molecular Genetics, Department of Antibiotics, Federal University of Pernambuco, Recife, Brazil
| | - Will de Barros Pita
- Laboratory of Renal Pathophysiology, Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Marcos Antonio de Morais
- Laboratory of Microbial Genetics, Department of Genetics, Federal University of Pernambuco, Recife, Brazil
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38
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Sharma S, Sharma P, Subedi U, Bhattarai S, Miller C, Manikandan S, Batinic-Haberle I, Spasojevic I, Sun H, Panchatcharam M, Miriyala S. Mn(III) Porphyrin, MnTnBuOE-2-PyP 5+, Commonly Known as a Mimic of Superoxide Dismutase Enzyme, Protects Cardiomyocytes from Hypoxia/Reoxygenation Induced Injury via Reducing Oxidative Stress. Int J Mol Sci 2023; 24:6159. [PMID: 37047131 PMCID: PMC10094288 DOI: 10.3390/ijms24076159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/15/2023] [Accepted: 03/22/2023] [Indexed: 04/14/2023] Open
Abstract
Myocardial ischemia-reperfusion injury (I/R) causes damage to cardiomyocytes through oxidative stress and apoptosis. We investigated the cardioprotective effects of MnTnBuOE-2-PyP5+ (BMX-001), a superoxide dismutase mimic, in an in vitro model of I/R injury in H9c2 cardiomyocytes. We found that BMX-001 protected against hypoxia/reoxygenation (H/R)-induced oxidative stress, as evident by a significant reduction in intracellular and mitochondrial superoxide levels. BMX-001 pre-treatment also reduced H/R-induced cardiomyocyte apoptosis, as marked by a reduction in TUNEL-positive cells. We further demonstrated that BMX-001 pre-treatment significantly improved mitochondrial function, particularly O2 consumption, in mouse adult cardiomyocytes subjected to H/R. BMX-001 treatment also attenuated cardiolipin peroxidation, 4-hydroxynonenal (4-HNE) level, and 4-HNE adducted proteins following H/R injury. Finally, the pre-treatment with BMX-001 improved cell viability and lactate dehydrogenase (LDH) activity in H9c2 cells following H/R injury. Our findings suggest that BMX-001 has therapeutic potential as a cardioprotective agent against oxidative stress-induced H/R damage in H9c2 cardiomyocytes.
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Affiliation(s)
- Sudha Sharma
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Papori Sharma
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Utsab Subedi
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Susmita Bhattarai
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Chloe Miller
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Shrivats Manikandan
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Ines Batinic-Haberle
- Department of Radiation Oncology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Ivan Spasojevic
- Department of Medicine, Duke University School of Medicine, Durham, NC 27710, USA
- Pharmacokinetics/Pharmacodynamics (PK/PD) Core Laboratory, Duke Cancer Institute, Duke University School of Medicine, Durham, NC 27710, USA
| | - Hong Sun
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Manikandan Panchatcharam
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
| | - Sumitra Miriyala
- Department of Cellular Biology and Anatomy, Louisiana State University Health Sciences-Shreveport, Shreveport, LA 71103, USA
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Nakayama T, Uno B. Reactivity of trans-Resveratrol toward Electrogenerated Superoxide in N, N-Dimethylformamide. J Agric Food Chem 2023; 71:4382-4393. [PMID: 36852964 DOI: 10.1021/acs.jafc.2c08105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The reactivity of 5-[(E)-2-(4-hydroxyphenyl)ethen-1-yl]benzene-1,3-diol (trans-resveratrol) and related compounds toward electrogenerated superoxide radical anion (O2•-) were investigated using electrochemistry, in situ electrolytic electron spin resonance, and in situ electrolytic ultraviolet-visible spectral measurements, in N,N-dimethylformamide (DMF) with the aid of density functional theory (DFT) calculations. The quasi-reversible cyclic voltammogram of dioxygen/O2•- was modified by the presence of trans-resveratrol, suggesting that the electrogenerated O2•- was scavenged by trans-resveratrol through proton-coupled electron transfer (PCET) via three phenolic hydroxy groups (OH) on the stilbene moiety. The reactivity of trans-resveratrol toward O2•- characterized by the OHs was experimentally confirmed in comparative analyses using some related compounds, pinosylvin, pterostilbene, p-coumaric acid, and so on, in DMF. The electrochemical and DFT results suggested that a concerted PCET mechanism via 4'OH of trans-resveratrol proceeds, where the coplanarity of the two phenolic rings in the stilbene moiety linked by an ethylene bridge is essential for a successful O2•- scavenging.
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Affiliation(s)
- Tatsushi Nakayama
- Department of Pharmacy, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Bunji Uno
- Faculty of Pharmacy, Gifu University of Medical Science, 4-3-3 Nijigaoka, Kani, Gifu 509-0923, Japan
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40
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Pick E. In memoriam: Filippo Rossi (1926-2022). J Leukoc Biol 2023; 113:231-235. [PMID: 36801947 DOI: 10.1093/jleuko/qiad005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Indexed: 01/28/2023] Open
Abstract
Description of the scientific life of Filippo Rossi, who died in October 2022.
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Affiliation(s)
- Edgar Pick
- Department of Clinical Microbiology and Immunology, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
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41
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Okina Y, Sato-Matsubara M, Kido Y, Urushima H, Daikoku A, Kadono C, Nakagama Y, Nitahara Y, Hoang TH, Thuy LTT, Matsubara T, Ohtani N, Ikeda K, Yoshizato K, Kawada N. Nitric Oxide Derived from Cytoglobin-Deficient Hepatic Stellate Cells Causes Suppression of Cytochrome c Oxidase Activity in Hepatocytes. Antioxid Redox Signal 2023; 38:463-479. [PMID: 36112670 PMCID: PMC10025843 DOI: 10.1089/ars.2021.0279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Aims: Cell-cell interactions between hepatocytes (Hep) and other liver cells are key to maintaining liver homeostasis. Cytoglobin (CYGB), expressed exclusively by hepatic stellate cells (HSC), is essential in mitigating mitochondrial oxidative stress. CYGB absence causes Hep dysfunction and evokes hepatocarcinogenesis through an elusive mechanism. CYGB deficiency is speculated to hinder nitric oxide dioxygenase (NOD) activity, resulting in the elevated formation and release of nitric oxide (NO). Hence, we hypothesized that NO accumulation induced by the loss of NOD activity in CYGB-deficient HSC could adversely affect mitochondrial function in Hep, leading to disease progression. Results: NO, a membrane-permeable gas metabolite overproduced by CYGB-deficient HSC, diffuses into the neighboring Hep to reversibly inhibit cytochrome c oxidase (CcO), resulting in the suppression of respiratory function in an electron transport chain (ETC). The binding of NO to CcO is proved using purified CcO fractions from Cygb knockout (Cygb-/-) mouse liver mitochondria. Its inhibitory action toward CcO-specific activity is fully reversed by the external administration of oxyhemoglobin chasing away the bound NO. Thus, these findings indicate that the attenuation of respiratory function in ETC causes liver damage through the formation of excessive reactive oxygen species. Treating Cygb-/- mice with an NO synthase inhibitor successfully relieved NO-induced inhibition of CcO activity in vivo. Innovation and Conclusion: Our findings provide a biochemical link between CYGB-absence in HSC and neighboring Hep dysfunction; mechanistically the absence of CYGB in HSC causes mitochondrial dysfunction of Hep via the inhibition of CcO activity by HSC-derived NO. Antioxid. Redox Signal. 38, 463-479.
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Affiliation(s)
- Yoshinori Okina
- Department of Medical Biochemistry, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
- Department of Hepatology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Misako Sato-Matsubara
- Department of Hepatology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
- Endowed Laboratory of Synthetic Biology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Yasutoshi Kido
- Department of Virology and Parasitology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
- Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Hayato Urushima
- Department of Anatomy and Regenerative Biology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Atsuko Daikoku
- Department of Anatomy and Regenerative Biology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Chiho Kadono
- Department of Hepatology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Yu Nakagama
- Department of Virology and Parasitology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
- Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Yuko Nitahara
- Department of Virology and Parasitology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
- Research Center for Infectious Disease Sciences, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Truong Huu Hoang
- Department of Hepatology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Le Thi Thanh Thuy
- Department of Hepatology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Tsutomu Matsubara
- Department of Anatomy and Regenerative Biology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Naoko Ohtani
- Department of Pathophysiology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Kazuo Ikeda
- Department of Anatomy and Regenerative Biology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Katsutoshi Yoshizato
- Endowed Laboratory of Synthetic Biology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
- BioIntegrence Co., Ltd., Osaka, Japan
| | - Norifumi Kawada
- Department of Hepatology, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
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Yu S, Caruso F, Belli S, Rossi M. Scavenging of Superoxide in Aprotic Solvents of Four Isoflavones That Mimic Superoxide Dismutase. Int J Mol Sci 2023; 24:ijms24043815. [PMID: 36835226 PMCID: PMC9965188 DOI: 10.3390/ijms24043815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2023] [Revised: 01/28/2023] [Accepted: 02/07/2023] [Indexed: 02/17/2023] Open
Abstract
Isoflavones are plant-derived natural products commonly found in legumes that show a large spectrum of biomedical activities. A common antidiabetic remedy in traditional Chinese medicine, Astragalus trimestris L. contains the isoflavone formononetin (FMNT). Literature reports show that FMNT can increase insulin sensitivity and potentially target the peroxisome proliferator-activated receptor gamma, PPARγ, as a partial agonist. PPARγ is highly relevant for diabetes control and plays a major role in Type 2 diabetes mellitus development. In this study, we evaluate the biological role of FMNT, and three related isoflavones, genistein, daidzein and biochanin A, using several computational and experimental procedures. Our results reveal the FMNT X-ray crystal structure has strong intermolecular hydrogen bonding and stacking interactions which are useful for antioxidant action. Cyclovoltammetry rotating ring disk electrode (RRDE) measurements show that all four isoflavones behave in a similar manner when scavenging the superoxide radical. DFT calculations conclude that antioxidant activity is based on the familiar superoxide σ-scavenging mode involving hydrogen capture of ring-A H7(hydroxyl) as well as the π-π (polyphenol-superoxide) scavenging activity. These results suggest the possibility of their mimicking superoxide dismutase (SOD) action and help explain the ability of natural polyphenols to assist in lowering superoxide concentrations. The SOD metalloenzymes all dismutate O2•- to H2O2 plus O2 through metal ion redox chemistry whereas these polyphenolic compounds do so through suitable hydrogen bonding and stacking intermolecular interactions. Additionally, docking calculations suggest FMNT can be a partial agonist of the PPARγ domain. Overall, our work confirms the efficacy in combining multidisciplinary approaches to provide insight into the mechanism of action of small molecule polyphenol antioxidants. Our findings promote the further exploration of other natural products, including those known to be effective in traditional Chinese medicine for potential drug design in diabetes research.
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Camp OG, Goud AP, Goud PT, Bai D, Awonuga A, Abu-Soud HM. Diminishing oocyte quality with advancing age is associated with deficiency of nitric oxide synthase cofactors, tetrahydrobiopterin and zinc, in mouse oocytes. F S Sci 2023; 4:114-120. [PMID: 36787827 DOI: 10.1016/j.xfss.2023.02.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 02/06/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To study the implications of decreased zinc and tetrahydrobiopterin (H4B) associated with chronological aging on oocyte quality using a mouse model. H4B and zinc are essential cofactors for nitric oxide synthase (NOS), as they aid in electron transfer and dimeric stability, and their bioavailability is crucial in regulating NOS coupling. We have previously shown sufficient levels of NO are essential for oocyte quality and activation, and NO levels decrease in the oocyte as a function of age. Thus, it is plausible that zinc and H4B may decrease as a function of age resulting in NOS dysfunction with subsequent depletion of NO. Additionally, increased production of ROS from the monomeric form can further disrupt oocyte quality and NO bioavailability. DESIGN Experimental laboratory study. SETTING Laboratory. ANIMALS B6D2F1 mice. INTERVENTIONS Sibling oocytes were retrieved from super-ovulated B6D2F1 mice from three age groups: 8-14 weeks [w] (young breeders, YB, n=112), 48-52w (retired breeders, RB, n=115) and 80-84w (old animals OA, n=75). MAIN OUTCOME MEASURES Oocytes were: 1) scored for ooplasmic/spindle microtubule morphology, chromosomal alignment, and cortical granule (CG) intactness using immunofluorescence and confocal microscopy with 3-D image reconstruction (n= 62, 65 and 35 in YB, RB and OA respectively) and 2) subjected to an HPLC assay to measure concentrations of H4B and its metabolites, as well as zinc measurement using mass spectrophotometry (n= 50, 50 and 40 in YB, RB and OA respectively). RESULTS 1) Oocyte scoring showed a reduction in "good" quality oocyte percentage as age increased, with YB having the highest percent of quality oocytes followed by RB and OA. 2) HPLC analysis showed a significant progressive decrease in total H4B in RB and OA (0.098 ng/oocyte and 0.069 ng/oocyte, respectfully) compared to YB (0.125 ng/oocyte). Atomic absorbance spectrophotometry revealed a significant progressive decrease in zinc concentration in RB and OA compared to YB (0.805 ng/oocyte and 0.554 ng/oocyte versus 1.00 ng/oocyte, respectfully). CONCLUSIONS Age related diminution in oocyte quality is paralleled by a decline in the levels of H4B and zinc. Resultant deficiency in the oocytes can lead to the inability of NOS to maintain dimerization. Consequent uncoupling of NOS generates superoxide (O2•-) instead NO, which participates in a multitude of reactions contributing to oxidative stress. Therefore, dysfunction of NOS secondary to zinc and H4B loss is a major mechanism involved in ROS generation and oocyte quality deterioration related to chronological age.
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Affiliation(s)
- Olivia G Camp
- Departments of Obstetrics and Gynaecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, Michigan
| | - Anuradha P Goud
- Departments of Obstetrics and Gynaecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, Michigan
| | - Pravin T Goud
- Division of Reproductive Endocrinology and Infertility & California IVF Fertility Center, Department of Obstetrics and Gynaecology, University of California Davis, Sacramento, California; California Northstate University Medical College, Elk Grove, California
| | - David Bai
- Departments of Obstetrics and Gynaecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, Michigan
| | - Awoniyi Awonuga
- Departments of Obstetrics and Gynaecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, Michigan
| | - Husam M Abu-Soud
- Departments of Obstetrics and Gynaecology, The C.S. Mott Center for Human Growth and Development, Wayne State University School of Medicine, Detroit, Michigan; Department of Physiology, Wayne State University School of Medicine, Detroit, Michigan; Department of Microbiology, Immunology and Biochemistry, Wayne State University School of Medicine, Detroit, Michigan.
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Andrews LS, Tsegaw YA, Cho HG, Riedel S. Observation and Characterization of the Hg-O Diatomic Molecule: A Matrix-Isolation and Quantum-Chemical Investigation. Chemistry 2023; 29:e202202740. [PMID: 36322698 PMCID: PMC10107950 DOI: 10.1002/chem.202202740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 11/06/2022]
Abstract
Mercuric oxide is a well-known and stable solid, but the diatomic molecule Hg-O is very fragile and does not survive detection in the gas phase. However, laser ablation of Hg atoms from a dental amalgam alloy target into argon or neon containing about 0.3 % of 16 O2 or of 18 O2 during their condensation into a cryogenic matrix at 4 K allows the formation of O atoms which react on annealing to make ozone and new IR absorptions in solid argon at 521.2 cm-1 for Hg-16 O or at 496.4 cm-1 for Hg-18 O with the oxygen isotopic frequency ratio 521.2/496.4=1.0499. Solid neon gives a 529.0 cm-1 absorption with a small 7.8 cm-1 blue shift. CCSD(T) calculations found 594 cm-1 for Hg16 O and 562 cm-1 for Hg18 O (frequency ratio=1.0569). Such calculations usually produce harmonic frequencies that are slightly higher than the anharmonic (observed) values, which supports their relationship. These observed frequencies have the isotopic shift predicted for Hg-O and are within the range of recent high-level frequency calculations for the Hg-O molecule. Spectra for the related mercury superoxide and ozonide species are also considered for the first time.
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Affiliation(s)
- Lester S Andrews
- Department of Chemistry, University of Virginia, Charlottesville, Virginia, 22904, USA
| | - Yetsedaw A Tsegaw
- Anorganische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
| | - Han-Gook Cho
- Department of Chemistry, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon, 22012, South Korea
| | - Sebastian Riedel
- Anorganische Chemie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstrasse 34-36, 14195, Berlin, Germany
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45
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Eaton L, Wang T, Roy M, Pamenter ME. Naked Mole-Rat Cortex Maintains Reactive Oxygen Species Homeostasis During In Vitro Hypoxia or Ischemia and Reperfusion. Curr Neuropharmacol 2023; 21:1450-1461. [PMID: 35339183 PMCID: PMC10324332 DOI: 10.2174/1570159x20666220327220929] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 03/07/2022] [Accepted: 03/23/2022] [Indexed: 11/22/2022] Open
Abstract
Neuronal injury during acute hypoxia, ischemia, and following reperfusion are partially attributable to oxidative damage caused by deleterious fluctuations of reactive oxygen species (ROS). In particular, mitochondrial superoxide (O2•-) production is believed to upsurge during lowoxygen conditions and also following reperfusion, before being dismutated to H2O2 and released into the cell. However, disruptions of redox homeostasis may be beneficially attenuated in the brain of hypoxia-tolerant species, such as the naked mole-rat (NMR, Heterocephalus glaber). As such, we hypothesized that ROS homeostasis is better maintained in the brain of NMRs during severe hypoxic/ ischemic insults and following reperfusion. We predicted that NMR brain would not exhibit substantial fluctuations in ROS during hypoxia or reoxygenation, unlike previous reports from hypoxiaintolerant mouse brain. To test this hypothesis, we measured cortical ROS flux using corrected total cell fluorescence measurements from live brain slices loaded with the MitoSOX red superoxide (O2•-) indicator or chloromethyl 2',7'-dichlorodihydrofluorescein diacetate (CM-H2-DCFDA; which fluoresces with whole-cell hydrogen peroxide (H2O2) production) during various low-oxygen treatments, exogenous oxidative stress, and reperfusion. We found that NMR cortex maintained ROS homeostasis during low-oxygen conditions, while mouse cortex exhibited a ~40% increase and a ~30% decrease in mitochondrial O2•- and cellular H2O2 production, respectively. Mitochondrial ROS homeostasis in NMRs was only disrupted following sodium cyanide application, which was similarly observed in mice. Our results suggest that NMRs have evolved strategies to maintain ROS homeostasis during acute bouts of hypoxia and reoxygenation, potentially as an adaptation to life in an intermittently hypoxic environment.
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Affiliation(s)
- Liam Eaton
- Department of Biology, University of Ottawa, Ottawa, ON, Canada
| | - Tina Wang
- Department of Biology, University of Ottawa, Ottawa, ON, Canada
| | - Maria Roy
- Department of Biology, University of Ottawa, Ottawa, ON, Canada
| | - Matthew E. Pamenter
- Department of Biology, University of Ottawa, Ottawa, ON, Canada
- University of Ottawa Brain and Mind Research Institute, Ottawa, ON, Canada
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46
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Richter SM, Massman LC, Stuehr DJ, Sweeny EA. Functional interactions between NADPH oxidase 5 and actin. Front Cell Dev Biol 2023; 11:1116833. [PMID: 36776559 PMCID: PMC9909703 DOI: 10.3389/fcell.2023.1116833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 01/17/2023] [Indexed: 01/28/2023] Open
Abstract
NADPH oxidase 5 (NOX5) is a transmembrane oxidative signaling enzyme which produces superoxide in response to intracellular calcium flux. Increasing evidence indicates that NOX5 is involved in a variety of physiological processes as well as human disease, however, details of NOX5 signaling pathways and targets of NOX5 mediated oxidative modifications remain poorly resolved. Actin dynamics have previously been shown to be modulated by oxidative modification, however, a direct connection to NOX5 expression and activity has not been fully explored. Here we show that NOX5 and actin interact in the cell, and each modulate the activity of the other. Using actin effector molecules jasplakinolide, cytochalasin D and latrunculin A, we show that changes in actin dynamics affect NOX5 superoxide production. In tandem, NOX5 oxidatively modifies actin, and shifts the ratio of filamentous to monomeric actin. Finally, we show that knockdown of NOX5 in the pancreatic cancer cell line PSN-1 impairs cell migration. Together our findings indicate an important link between actin dynamics and oxidative signaling through NOX5.
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Affiliation(s)
- Samantha M Richter
- Department of Biochemistry, The Medical College of Wisconsin, Milwaukee, WI, United States
| | - Lilyanna C Massman
- Department of Biochemistry, The Medical College of Wisconsin, Milwaukee, WI, United States
| | - Dennis J Stuehr
- Department of Inflammation and Immunity, Lerner Research Institute, The Cleveland Clinic, Cleveland, OH, United States
| | - Elizabeth A Sweeny
- Department of Biochemistry, The Medical College of Wisconsin, Milwaukee, WI, United States
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Li H, Fan H, Lu K, Zhu Q, Wu J. Purification of Extracellular Protease from Staphylococcus simulans QB7and Its Ability in Generating Antioxidant and Anti-inflammatory Peptides from Meat Proteins. Nutrients 2022; 15. [PMID: 36615723 DOI: 10.3390/nu15010065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 12/14/2022] [Accepted: 12/19/2022] [Indexed: 12/29/2022] Open
Abstract
Proteases, especially microbial proteases, are widely used in food processing. The purpose of this study was aimed to purify an extracellular protease produced by the strain Staphylococcus simulans QB7 and to evaluate its ability in hydrolyzing meat proteins and generating antioxidant and anti-inflammatory peptides. The optimal conditions for producing the enzyme were as follows: inoculum ratio, 10%; initial pH, 6.5; temperature, 32 °C; incubation time, 36 h; and rotation speed, 160 rpm. The protease had a molecular weight of approximately 47 kDa, possessing the optimal activity at 50 °C, pH 7.0, The protease was stable at pH 4.0-8.0 and 30-60 °C, and the activity was improved by Na+, Mg2+, Ca2+, and Zn2+ ions, whereas it was inhibited by Cu2+, Co2+, Fe3+, Ba2+, Fe2+, β-M, and ethylene diamine tetraacetic acid disodium salt (EDTA). The protease could effectively hydrolyze meat proteins, and the generated hydrolysate could significantly inhibit tumor necrosis factor-alpha (TNFα)-induced oxidative stress, including superoxide and malondialdehyde levels and inflammation (vascular adhesion molecule-1 [VCAM-1] and cyclooxygenase 2 [COX2)) in human vascular EA.hy926 cells. The present findings support the ability of S. simulans QB7 protease in generating antioxidant and anti-inflammatory peptides during the fermentation of meat products.
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Matsumoto M, Sawada H, Iwata K, Ibi M, Asaoka N, Katsuyama M, Shintani-Ishida K, Ikegaya H, Takegami S, Umemura A, Yabe-Nishimura C. Bortezomib is an effective enhancer for chemical probe-dependent superoxide detection. Front Med (Lausanne) 2022; 9:941180. [PMID: 36619644 PMCID: PMC9811382 DOI: 10.3389/fmed.2022.941180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 11/30/2022] [Indexed: 12/24/2022] Open
Abstract
Various chemical probes for the detection of reactive oxygen species have been developed to examine oxidative stress associated with different pathologies. L-012, a luminol-based chemiluminescent probe, is widely used to detect extracellular superoxide because of its high sensitivity. We herein demonstrated that the co-application of the peptide boronic acid proteasome inhibitor, bortezomib, with L-012 significantly increased its luminescence without affecting the background. More than a 5-fold increase was detected in the total luminescence of L-012 in both NADPH oxidase-expressing cells and the xanthine oxidase-dependent cell-free superoxide generation system, but not in their background. Therefore, bortezomib increased the signal-to-background ratio and improved the detection of low levels of superoxide. The application of MLN2238, another peptide boronic acid proteasome inhibitor, also enhanced the luminescence of L-012. In contrast, carfilzomib, an epoxyketone proteasome inhibitor, did not increase luminescence, suggesting that the effects of bortezomib depend on the chemical structure of the peptide boronic acid, but not on its pharmacological effects. Bortezomib-induced enhancements appeared to be specific to the detection of superoxide because the detection of H2O2 by Amplex Red/HRP was not affected by the application of bortezomib. In the quantitative detection of the superoxide-specific oxidative product 2-hydroxyethidium (2-OH-E+), the application of bortezomib resulted in a 2-fold increase in the level of 2-OH-E+. Therefore, bortezomib sensitizes the detection of superoxide in both cell-based and cell-free systems, highlighting a novel feature of compounds containing the peptide boronic acid as powerful enhancers for the detection of superoxide.
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Affiliation(s)
- Misaki Matsumoto
- 1Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan,*Correspondence: Misaki Matsumoto,
| | - Hikari Sawada
- 1Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kazumi Iwata
- 1Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masakazu Ibi
- 1Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Nozomi Asaoka
- 1Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masato Katsuyama
- 2Radioisotope Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kaori Shintani-Ishida
- 3Department of Forensic Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Hiroshi Ikegaya
- 3Department of Forensic Medicine, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Shigehiko Takegami
- 4Department of Analytical Chemistry, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Atsushi Umemura
- 1Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Li X, Deng D, Cataltepe G, Román Á, Buckley CR, Cassano Monte‐Bello C, Skirycz A, Caldana C, Haydon MJ. A reactive oxygen species Ca 2+ signalling pathway identified from a chemical screen for modifiers of sugar-activated circadian gene expression. New Phytol 2022; 236:1027-1041. [PMID: 35842791 PMCID: PMC9804775 DOI: 10.1111/nph.18380] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 07/13/2022] [Indexed: 06/10/2023]
Abstract
Sugars are essential metabolites for energy and anabolism that can also act as signals to regulate plant physiology and development. Experimental tools to disrupt major sugar signalling pathways are limited. We performed a chemical screen for modifiers of activation of circadian gene expression by sugars to discover pharmacological tools to investigate and manipulate plant sugar signalling. Using a library of commercially available bioactive compounds, we identified 75 confident hits that modified the response of a circadian luciferase reporter to sucrose in dark-adapted Arabidopsis thaliana seedlings. We validated the transcriptional effect on a subset of the hits and measured their effects on a range of sugar-dependent phenotypes for 13 of these chemicals. Chemicals were identified that appear to influence known and unknown sugar signalling pathways. Pentamidine isethionate was identified as a modifier of a sugar-activated Ca2+ signal that acts as a calmodulin inhibitor downstream of superoxide in a metabolic signalling pathway affecting circadian rhythms, primary metabolism and plant growth. Our data provide a resource of new experimental tools to manipulate plant sugar signalling and identify novel components of these pathways.
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Affiliation(s)
- Xiang Li
- School of BioSciencesUniversity of MelbourneParkvilleVic.3010Australia
| | - Dongjing Deng
- School of BioSciencesUniversity of MelbourneParkvilleVic.3010Australia
| | - Gizem Cataltepe
- School of BioSciencesUniversity of MelbourneParkvilleVic.3010Australia
- Max Planck Institute of Molecular Plant Physiology14476PotsdamGermany
| | - Ángela Román
- School of BioSciencesUniversity of MelbourneParkvilleVic.3010Australia
| | | | | | | | - Camila Caldana
- Max Planck Institute of Molecular Plant Physiology14476PotsdamGermany
| | - Michael J. Haydon
- School of BioSciencesUniversity of MelbourneParkvilleVic.3010Australia
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Fan H, Bhullar KS, Wang Z, Wu J. Soybean-Derived Tripeptide Leu-Ser-Trp (LSW) Protects Human Vascular Endothelial Cells from TNFα-Induced Oxidative Stress and Inflammation via Modulating TNFα Receptors and SIRT1. Foods 2022; 11. [PMID: 36359987 DOI: 10.3390/foods11213372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 10/16/2022] [Accepted: 10/21/2022] [Indexed: 11/16/2022] Open
Abstract
Soybean is a rich source of high-quality proteins and an excellent food source of bioactive peptides. A tripeptide, Leu−Ser−Trp (LSW), was previously identified from soybean as an angiotensin-converting enzyme inhibitory peptide. In the present work, we further studied its antioxidant and anti-inflammatory activities in human vascular endothelial cells (EA.hy926) and elucidated the mechanisms underlying these biological activities. In tumor necrosis factor alpha (TNFα)-stimulated EA.hy926 cells, LSW significantly inhibited oxidative stress, both reduced superoxide and malondialdehyde levels (p < 0.001), owing to its free-radical-scavenging ability. LSW treatment also mitigated the elevated protein expression of vascular adhesion molecule-1 (p < 0.001) and cyclooxygenase 2 (p < 0.01) via inhibition of NF-κB and p38/JNK signaling, respectively. Additionally, LSW also inhibited the endogenous formation of TNFα and attenuated the expression of its two receptors in EA.hy926 cells. Furthermore, LSW upregulated sirtuin-1 level, which partially contributed to its anti-inflammatory activity. These results demonstrate the multiple roles of LSW in ameliorating vascular endothelial oxidative stress and inflammatory responses, which support its uses as a nutraceutical or functional food ingredient for combating endothelial dysfunction and cardiovascular diseases.
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