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Ji Q, Liu J, Wang G, Liu L, Zhong J. EphA2 overexpression reduces H2O2-induced damage of lens epithelial cells. Genet Mol Biol 2021; 44:e20200414. [PMID: 34358285 PMCID: PMC8345112 DOI: 10.1590/1678-4685-gmb-2020-0414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 05/04/2021] [Indexed: 11/27/2022] Open
Abstract
Age-related cataract (ARC) is a progressive lens opacification that occurs from
middle to old age. Eph-receptor tyrosinekinase-type A2 (EphA2) has been reported
to be associated with ARC. This work aims to investigate the molecular mechanism
of EphA2 in ARC. We treated human lens epithelial cells (SRA01/04) with
different concentration of H2O2 to induce lens epithelial
cell damage. Then, we found that H2O2 treatment
significantly suppressed cell viability and enhanced the expression of EphA2 in
the SRA01/04 cells. H2O2 treatment repressed cell
viability and enhanced the levels of reactive oxygen species (ROS) in SRA01/04
cells, which was partly abolished by EphA2 up-regulation. Moreover, EphA2
overexpression reduced H2O2-induced apoptosis of SRA01/04
cells. EphA2 up-regulation caused an up-regulation of Bcl-2, and repressed the
expression of Bax and Cleaved-caspase-3 in the SRA01/04 cells following
H2O2 treatment. In conclusion, our data confirm that
EphA2 overexpression enhances cell viability and inhibits apoptosis in the
H2O2-treated SRA01/04 cells, thereby reducing
H2O2-induced damage of lens epithelial cells. Thus,
this work provides new insights into the mechanism of EphA2 in ARC.
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Affiliation(s)
- Qingshan Ji
- University of Science and Technology of China, Affiliated First Hospital of USTC, Division of Life Sciences and Medicine, Department of Ophthalmology, Hefei, China
| | - Jing Liu
- Ophthalmic Hospital of Wuhu, Department of Ophthalmology, Wuhu, China
| | - Guifang Wang
- Loudi Central Hospital of Hunan, Department of Ophthalmology, China
| | - Lian Liu
- Affiliated First Hospital of Jinan University, Department of Ophthalmology, Guangzhou, China
| | - Jingxiang Zhong
- Affiliated First Hospital of Jinan University, Department of Ophthalmology, Guangzhou, China
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2
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Athanasopoulou S, Simos D, Charalampopoulou M, Tentolouris N, Kokkinos A, Bacopoulou F, Aggelopoulou E, Zigkiri E, Chrousos GP, Darviri C, Gonos ES. Significant improvement of stress and aging biomarkers using a novel stress management program with the cognitive restructuring method "Pythagorean Self-Awareness Intervention" in patients with type 2 diabetes mellitus and healthy adults. Mech Ageing Dev 2021; 198:111538. [PMID: 34217756 DOI: 10.1016/j.mad.2021.111538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/16/2021] [Accepted: 06/29/2021] [Indexed: 12/14/2022]
Abstract
Stress accelerates aging by affecting relevant cellular pathways including, among others, leucocyte telomere length (LTL) and proteasome levels. Their impaired function underlies several age-related and non-communicable conditions, such as type 2 diabetes mellitus. The aim of the present study was to investigate, for the first time, the dynamics of stress-related aging factors in the frame of a novel stress-management technique, the Pythagorean Self Awareness Intervention (PSAI), in healthy volunteers and adults with type 2 diabetes. To this end a cohort of 311 healthy volunteers was initially studied and LTL and proteasome levels were analysed in a subgroup of healthy volunteers and adults with type 2 diabetes who were enrolled in the PSAI, with regards to specific physio- and psychometric characteristics of the participants (baseline and post-intervention). We have found a significant improvement of aging biomarkers and of psycho-/bio-factors in all participants. More specifically, post-intervention, both healthy adults and patients with type 2 diabetes demonstrated improved LTL and proteasome levels. Significant improvements were also observed in psychometric, anthropometric and key metabolic features as well as in hair cortisol. In conclusion our results highlighted potential key targets of such interventions and prognostic tools for the assessment of aging pace in clinical practice.
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Affiliation(s)
- Sophia Athanasopoulou
- Institute of Chemical Biology, National Hellenic Research Foundation (NHRF), Athens, 11635, Greece; Faculty of Medicine, School of Health Sciences, University of Thessaly, Larisa, Greece
| | - Dimitrios Simos
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece
| | - Maria Charalampopoulou
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece
| | - Nikolaos Tentolouris
- Diabetes Center, First Department of Propaedeutic Internal Medicine, Medical School, National and Kapodistrian University of Athens, Laiko General Hospital, Athens, 11527, Greece
| | - Alexandros Kokkinos
- Diabetes Center, First Department of Propaedeutic Internal Medicine, Medical School, National and Kapodistrian University of Athens, Laiko General Hospital, Athens, 11527, Greece
| | - Flora Bacopoulou
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece; Center for Adolescent Medicine and UNESCO Chair on Adolescent Health Care, First Department of Pediatrics, School of Medicine, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, 11527, Greece; University Research Institute of Maternal and Child Health and Precision Medicine, and UNESCO Chair on Adolescent Health Care, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, 11527, Greece
| | - Elena Aggelopoulou
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece
| | - Eleni Zigkiri
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece
| | - George P Chrousos
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece; University Research Institute of Maternal and Child Health and Precision Medicine, and UNESCO Chair on Adolescent Health Care, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens, 11527, Greece; Division of Endocrinology and Metabolism, Biomedical Research Foundation of the Academy of Athens, Athens, 11527, Greece.
| | - Christina Darviri
- Postgraduate Course Stress Management and Health Promotion, School of Medicine, National and Kapodistrian University of Athens, Athens, 11527, Greece.
| | - Efstathios S Gonos
- Institute of Chemical Biology, National Hellenic Research Foundation (NHRF), Athens, 11635, Greece.
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3
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Tewari D, Sah AN, Bawari S, Nabavi SF, Dehpour AR, Shirooie S, Braidy N, Fiebich BL, Vacca RA, Nabavi SM. Role of Nitric Oxide in Neurodegeneration: Function, Regulation, and Inhibition. Curr Neuropharmacol 2020; 19:114-126. [PMID: 32348225 PMCID: PMC8033982 DOI: 10.2174/1570159x18666200429001549] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/17/2020] [Accepted: 04/24/2020] [Indexed: 12/14/2022] Open
Abstract
Reactive nitrogen species (RNS) and reactive oxygen species (ROS), collectively known as reactive oxygen and nitrogen species (RONS), are the products of normal cellular metabolism and interact with several vital biomolecules including nucleic acid, proteins, and membrane lipids and alter their function in an irreversible manner which can lead to cell death. There is an imperative role for oxidative stress in the pathogenesis of cognitive impairments and the development and progression of neural injury. Elevated production of higher amounts of nitric oxide (NO) takes place in numerous pathological conditions, such as neurodegenerative diseases, inflammation, and ischemia, which occur concurrently with elevated nitrosative/oxidative stress. The enzyme nitric oxide synthase (NOS) is responsible for the generation of NO in different cells by conversion of L-arginine (Arg) to L-citrulline. Therefore, the NO signaling pathway represents a viable therapeutic target. Naturally occurring polyphenols targeting the NO signaling pathway can be of major importance in the field of neurodegeneration and related complications. Here, we comprehensively review the importance of NO and its production in the human body and afterwards highlight the importance of various natural products along with their mechanisms against various neurodegenerative diseases involving their effect on NO production.
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Affiliation(s)
- Devesh Tewari
- Department of Pharmacognosy, School of Pharmaceutical Sciences, Lovely Professional University, Phagwara, Punjab, 144411, India
| | - Archana N Sah
- Department of Pharmaceutical Sciences, Faculty of Technology, Bhimtal Campus, Kumaun University, Nainital, Uttarakhand 263136, India
| | - Sweta Bawari
- School of Pharmacy, Sharda University, Knowledge Park-III, Greater Noida, Uttar Pradesh, 201310, India
| | - Seyed F Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran 1435916471, Iran
| | - Ahmad R Dehpour
- Department of Pharmacology, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Samira Shirooie
- Pharmaceutical Sciences Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Nady Braidy
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, Australia
| | - Bernd L Fiebich
- Neuroimmunology and Neurochemistry Research Group, Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Rosa A Vacca
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, National Council of Research, Bari, Italy
| | - Seyed M Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran 1435916471, Iran
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Kien CL, Bunn JY, Fukagawa NK, Anathy V, Matthews DE, Crain KI, Ebenstein DB, Tarleton EK, Pratley RE, Poynter ME. Lipidomic evidence that lowering the typical dietary palmitate to oleate ratio in humans decreases the leukocyte production of proinflammatory cytokines and muscle expression of redox-sensitive genes. J Nutr Biochem 2015; 26:1599-606. [PMID: 26324406 DOI: 10.1016/j.jnutbio.2015.07.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 07/09/2015] [Accepted: 07/29/2015] [Indexed: 12/11/2022]
Abstract
We recently reported that lowering the high, habitual palmitic acid (PA) intake in ovulating women improved insulin sensitivity and both inflammatory and oxidative stress. In vitro studies indicate that PA can activate both cell membrane toll-like receptor-4 and the intracellular nucleotide oligomerization domain-like receptor protein (NLRP3). To gain further insight into the relevance to human metabolic disease of dietary PA, we studied healthy, lean and obese adults enrolled in a randomized, crossover trial comparing 3-week, high-PA (HPA) and low-PA/high-oleic-acid (HOA) diets. After each diet, both hepatic and peripheral insulin sensitivities were measured, and we assessed cytokine concentrations in plasma and in supernatants derived from lipopolysaccharide-stimulated peripheral blood mononuclear cells (PBMCs) as well as proinflammatory gene expression in skeletal muscle. Insulin sensitivity was unaffected by diet. Plasma concentration of tumor necrosis factor-α was higher during the HPA diet. Lowering the habitually high PA intake by feeding the HOA diet resulted in lower secretion of interleukin (IL)-1β, IL-18, IL-10, and tumor necrosis factor-α by PBMCs, as well as lower relative mRNA expression of cJun and NLRP3 in muscle. Principal components analysis of 156 total variables coupled to analysis of covariance indicated that the mechanistic pathway for the differential dietary effects on PBMCs involved changes in the PA/OA ratio of tissue lipids. Our results indicate that lowering the dietary and tissue lipid PA/OA ratio resulted in lower leukocyte production of proinflammatory cytokines and muscle expression of redox-sensitive genes, but the relevance to diabetes risk is uncertain.
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Affiliation(s)
- C Lawrence Kien
- Department of Pediatrics, University of Vermont, Burlington, VT; Department of Medicine, University of Vermont, Burlington, VT.
| | - Janice Y Bunn
- Department of Medical Biostatistics, University of Vermont, Burlington, VT
| | | | - Vikas Anathy
- Department of Pathology and Laboratory Medicine, University of Vermont, Burlington, VT
| | - Dwight E Matthews
- Department of Medicine, University of Vermont, Burlington, VT; Department of Chemistry, University of Vermont, Burlington, VT
| | - Karen I Crain
- Department of Medicine, University of Vermont, Burlington, VT
| | | | - Emily K Tarleton
- College of Medicine Clinical Research Center, University of Vermont, Burlington, VT
| | - Richard E Pratley
- Translational Research Institute for Metabolism and Diabetes, Sanford-Burnham Medical Research Institute, Orlando, FL
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5
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Rivas-Arancibia S, Zimbrón LFH, Rodríguez-Martínez E, Maldonado PD, Borgonio Pérez G, Sepúlveda-Parada M. Oxidative stress-dependent changes in immune responses and cell death in the substantia nigra after ozone exposure in rat. Front Aging Neurosci 2015; 7:65. [PMID: 25999851 PMCID: PMC4419716 DOI: 10.3389/fnagi.2015.00065] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 04/14/2015] [Indexed: 11/22/2022] Open
Abstract
Parkinson's disease has been associated with the selective loss of neurons in the substantia nigra pars compacta. Increasing evidence suggests that oxidative stress plays a major role. The resulting increase in reactive oxygen species triggers a sequence of events that leads to cell damage, activation of microglia cells and neuroinflammatory responses. Our objective was to study whether chronic exposure to low doses of ozone, which produces oxidative stress itself, induces progressive cell death in conjunction with glial alterations in the substantia nigra. Animals were exposed to an ozone-free air stream (control) or to low doses of ozone for 7, 15, 30, 60, or 90 days. Each group underwent (1) spectrophotometric analysis for protein oxidation; (2) western blot testing for microglia reactivity and nuclear factor kappa B expression levels; and (3) immunohistochemistry for cytochrome c, GFAP, Iba-1, NFkB, and COX-2. Our results indicate that ozone induces an increase in protein oxidation levels, changes in activated astrocytes and microglia, and cell death. NFkB and cytochrome c showed an increase until 30 days of exposure, while cyclooxygenase 2 in the substantia nigra increased from 7 days up to 90 days of repetitive ozone exposure. These results suggest that oxidative stress caused by ozone exposure induces changes in inflammatory responses and progressive cell death in the substantia nigra in rats, which could also be occurring in Parkinson's disease.
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Affiliation(s)
- Selva Rivas-Arancibia
- Laboratorio de estrés Oxidativo y Plasticidad Cerebral, Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México México, México
| | - Luis Fernando Hernández Zimbrón
- Laboratorio de estrés Oxidativo y Plasticidad Cerebral, Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México México, México
| | - Erika Rodríguez-Martínez
- Laboratorio de estrés Oxidativo y Plasticidad Cerebral, Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México México, México
| | - Perla D Maldonado
- Laboratorio de Patología Vascular Cerebral, Instituto Nacional de Neurología y Neurocirugía, Manuel Velasco Suárez México, México
| | - Gabino Borgonio Pérez
- Laboratorio de estrés Oxidativo y Plasticidad Cerebral, Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México México, México
| | - María Sepúlveda-Parada
- Laboratorio de estrés Oxidativo y Plasticidad Cerebral, Departamento de Fisiología, Facultad de Medicina, Universidad Nacional Autónoma de México México, México
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6
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Landar A, Giles N, Zmijewski JW, Watanabe N, Oh J, Darley–Usmar VM. Modification of lipids by reactive oxygen and nitrogen species: the oxy–nitroxy–lipidome and its role in redox cell signaling. ACTA ACUST UNITED AC 2006. [DOI: 10.2217/17460875.1.2.203] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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7
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Pereyra-Muñoz N, Rugerio-Vargas C, Angoa-Pérez M, Borgonio-Pérez G, Rivas-Arancibia S. Oxidative damage in substantia nigra and striatum of rats chronically exposed to ozone. J Chem Neuroanat 2006; 31:114-23. [PMID: 16236481 DOI: 10.1016/j.jchemneu.2005.09.006] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2004] [Revised: 09/19/2005] [Accepted: 09/20/2005] [Indexed: 01/25/2023]
Abstract
The purpose of this work was to study if chronic low-dose ozone exposure could per se induce oxidative damage to neurons of striatum and substantia nigra. Thirty male Wistar rats were divided into three groups--Group 1: exposed to an air stream free of ozone; Group 2: exposed for 15 days to ozone; Group 3: exposed for 30 days to ozone. Ozone exposure was carried out daily for 4 h at a 0.25 ppm dose. Each group was then tested for (1) motor activity, (2) quantification of lipid peroxidation levels, (3) Klüver-Barrera staining, and (4) immunohistochemistry for tyrosine hydroxylase (TH), dopamine and adenosine 3',5'-monophosphate-regulated phosphoprotein of 32 kD (DARPP-32), inducible nitric oxide synthase (iNOS), and superoxide dismutase (SOD), to study neuronal alterations in striatum and substantia nigra. Results indicate that ozone exposure causes a significant decrease in motor activity. Ozone produced lipid peroxidation, morphological alterations, loss of fibers and cell death of the dopaminergic neurons. The DARPP-32, iNOS and SOD expression increased with repetitive ozone exposure. These alterations suggest that ozone causes oxidative stress which induces oxidative damage to substantia nigra and striatum of the rat.
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Affiliation(s)
- Naira Pereyra-Muñoz
- Physiology Department, Faculty of Medicine, National Autonomous University of Mexico, CP 04510, AP 70-250, Mexico-City, Mexico
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8
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Landar A, Darley-Usmar VM. Nitric oxide and cell signaling: modulation of redox tone and protein modification. Amino Acids 2003; 25:313-21. [PMID: 14661093 DOI: 10.1007/s00726-003-0019-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2002] [Revised: 01/01/2003] [Accepted: 05/08/2003] [Indexed: 10/26/2022]
Abstract
Reactive oxygen species (ROS) and reactive nitrogen species (RNS) have an impact on many cellular processes, often serving as signal transducers in both physiological and pathological situations. These small molecules can act as ligands for receptors as is the case for nitric oxide and guanylate cyclase. However, they can also modify proteins, changing their function and establishing a baseline for other signals in a process that we have termed "redox tone." In this review, we discuss the different mechanisms of redox cell signaling, and give specific examples of RNS participation in cell signaling via classical and redox tone pathways.
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Affiliation(s)
- A Landar
- Department of Pathology, Center for Free Radical Biology, University of Alabama at Birmingham, USA
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9
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Goswami S, Sheets NL, Zavadil J, Chauhan BK, Bottinger EP, Reddy VN, Kantorow M, Cvekl A. Spectrum and range of oxidative stress responses of human lens epithelial cells to H2O2 insult. Invest Ophthalmol Vis Sci 2003; 44:2084-93. [PMID: 12714647 PMCID: PMC2080867 DOI: 10.1167/iovs.02-0882] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Oxidative stress (OS) is believed to be a major contributor to age-related cataract and other age-related diseases. METHODS cDNA microarrays were used to identify the spectrum and range of genes with transcript levels that are altered in response to acute H(2)O(2)-induced OS in human lens epithelial (HLE) cells. HLE cells were treated with 50 microM H(2)O(2) for 1 hour in the absence of serum, followed by a return to complete medium. RNAs were prepared from treated and untreated cells at 0, 1, 2, and 8 hours after H(2)O(2) treatment. RESULTS The data showed 1171 genes that were significantly up- and downregulated in response to H(2)O(2) treatment. Several functional subcategories of genes were identified, including those encoding DNA repair proteins, antioxidant defense enzymes, molecular chaperones, protein biosynthesis enzymes, and trafficking and degradation proteins. Differential expression of selected genes was confirmed at the level of RNA and/or protein. Many of the identified genes (e.g., glutathione S-transferase [MGST2], thioredoxin reductase beta, and peroxiredoxin 2) have been identified as participants in OS responses in the lens and other systems. Some genes induced by OS in the current study (e.g., oxygen regulated protein [ORP150] and heat shock protein [HSP40]) are better known to respond to other forms of stress. Two genes (receptor tyrosine kinase [AXL/ARK] and protein phosphatase 2A) are known to be differentially expressed in cataract. Most of the genes point to a novel pathways associated with OS. CONCLUSIONS The present data provide a global perspective on those genes that respond to acute OS, point to novel genes and pathways associated with OS, and set the groundwork for understanding the functions of OS-related genes in lens protection and disease.
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Affiliation(s)
- Sumanta Goswami
- Department of Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, New York
- Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York
| | - Nancy L. Sheets
- Department of Biology, West Virginia University, Morgantown, West Virginia
| | - Jiři Zavadil
- Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Bharesh K. Chauhan
- Department of Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, New York
- Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York
| | - Erwin P. Bottinger
- Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York
- Department of Medicine, Albert Einstein College of Medicine, Bronx, New York
| | - Venkat N. Reddy
- Department of Ophthalmology and Visual Sciences, University of Michigan, Ann Arbor, Michigan
| | - Marc Kantorow
- Department of Biology, West Virginia University, Morgantown, West Virginia
| | - Aleš Cvekl
- Department of Ophthalmology and Visual Sciences, Albert Einstein College of Medicine, Bronx, New York
- Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, New York
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Nishiyama T, Tamekuni H, Tachibana T, Kitamura H, Saito S. Antioxidative activity of hydroxylamines. ESR spectra of radicals derived from hydroxylamines. Free Radic Res 2001; 35:895-905. [PMID: 11811540 DOI: 10.1080/10715760100301391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The antioxidative activity of hydroxylamines was evaluated for the oxidation of tetralin at 61 degrees C and linoleic acid micelles in an aqueous dispersion at 37 degrees C, induced by an azo initiator. The antioxidative efficacy of the hydroxylamines for the oxidation of tetralin was smaller than that of alpha-tocopherol. However, the hydroxylamines showed more potent antioxidative activity than that of the alpha-tocopherol against the oxidation of linoleic acid micelles. On the basis of the results of an ESR study and the oxidation product obtained, it is suggested that active position in hydroxylamines depend not only on hydroxyl hydrogen-atom, but also on the allylic hydrogen atom.
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Affiliation(s)
- T Nishiyama
- Department of Applied Chemistry, Faculty of Engineering, Kansai University, Suita, Osaka, Japan.
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