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Yalçın E, Macar O, Kalefetoğlu Macar T, Çavuşoğlu D, Çavuşoğlu K. Multi-protective role of Echinacea purpurea L. water extract in Allium cepa L. against mercury(II) chloride. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:62868-62876. [PMID: 34218367 PMCID: PMC8254617 DOI: 10.1007/s11356-021-15097-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 06/20/2021] [Indexed: 04/16/2023]
Abstract
Mercury (Hg) is a persistent and dangerous heavy metal with genotoxic properties. Echinacea purpurea L. is a well-known therapeutic plant with anti-inflammatory, antioxidant, and anti-tumor properties. In this study, multi-protective role of Echinacea purpurea L. extract against toxicity caused by mercury(II) chloride (HgCI2) on Allium cepa L. investigated in a multifaceted way. As a consequence of 100 mgL-1 HgCI2 administration, root elongation, weight increase, germination rate, and mitotic index were reduced, whereas micronucleus frequency, chromosomal abnormalities frequency, meristematic cell injuries severity, malondialdehyde level, catalase, and superoxide dismutase activity were increased. On the other hand, co-administration of increasing doses of E. purpurea extract (265 mgL-1 and 530 mgL-1) and HgCI2 gradually alleviated all observed toxic effects of HgCI2. Protective role of E. purpurea extract against HgCI2-toxicity on A. cepa were clearly demonstrated in this study. The results of this study will lead to future researches investigating use of E. purpurea extract against genotoxic contaminants.
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Affiliation(s)
- Emine Yalçın
- Department of Biology, Faculty of Science and Art, Giresun University, Giresun, Turkey
| | - Oksal Macar
- Department of Food Technology, Sebinkarahisar School of Applied Sciences, Giresun University, Giresun, Turkey.
| | - Tuğçe Kalefetoğlu Macar
- Department of Food Technology, Sebinkarahisar School of Applied Sciences, Giresun University, Giresun, Turkey
| | - Dilek Çavuşoğlu
- Department of Plant and Animal Production, Atabey Vocational High School, Isparta University of Applied Sciences, Isparta, Turkey
| | - Kültiğin Çavuşoğlu
- Department of Biology, Faculty of Science and Art, Giresun University, Giresun, Turkey
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Effect of Tadalafil Administration on Redox Homeostasis and Polyamine Levels in Healthy Men with High Level of Physical Activity. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18199962. [PMID: 34639267 PMCID: PMC8508218 DOI: 10.3390/ijerph18199962] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/14/2021] [Accepted: 09/20/2021] [Indexed: 01/07/2023]
Abstract
Background: The phosphodiesterase type 5 inhibitor (PDE5I) tadalafil, in addition to its therapeutic role, has shown antioxidant effects in different in vivo models. Supplementation with antioxidants has received interest as a suitable tool for preventing or reducing exercise-related oxidative stress, possibly leading to the improvement of sport performance in athletes. However, the use/abuse of these substances must be evaluated not only within the context of amateur sport, but especially in competitions where elite athletes are more exposed to stressful physical practice. To date, very few human studies have addressed the influence of the administration of PDE5Is on redox balance in subjects with a fitness level comparable to elite athletes; therefore, the aim of this study was to investigate for the first time whether acute ingestion of tadalafil could affect plasma markers related to cellular damage, redox homeostasis, and blood polyamines levels in healthy subjects with an elevated cardiorespiratory fitness level. Methods: Healthy male volunteers (n = 12), with a VO2max range of 40.1–56.0 mL/(kg × min), were administered with a single dose of tadalafil (20 mg). Plasma molecules related to muscle damage and redox-homeostasis, such as creatine kinase (CK), lactate dehydrogenase (LDH), total antioxidant capacity (TAC), reduced/oxidized glutathione ratio (GSH/GSSG), free thiols (FTH), antioxidant enzyme activities (superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx)), as well as thiobarbituric acid reactive substances (TBARs), protein carbonyls (PrCAR), and polyamine levels (spermine (Spm) and spermidine (Spd)) were evaluated immediately before and 2, 6 and 24 hours after the acute tadalafil administration. Results: A single tadalafil administration induced an increase in CK and LDH plasma levels 24 after consumption. No effects were observed on redox homeostasis or antioxidant enzyme activities, and neither were they observed on the oxidation target molecules or polyamines levels. Conclusion: Our results show that in subjects with an elevated fitness level, a single administration of tadalafil induced a significant increase in muscle damage target without affecting plasma antioxidant status.
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Hansen JM, Jones DP, Harris C. The Redox Theory of Development. Antioxid Redox Signal 2020; 32:715-740. [PMID: 31891515 PMCID: PMC7047088 DOI: 10.1089/ars.2019.7976] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 12/30/2019] [Indexed: 12/16/2022]
Abstract
Significance: The geological record shows that as atmospheric O2 levels increased, it concomitantly coincided with the evolution of metazoans. More complex, higher organisms contain a more cysteine-rich proteome, potentially as a means to regulate homeostatic responses in a more O2-rich environment. Regulation of redox-sensitive processes to control development is likely to be evolutionarily conserved. Recent Advances: During early embryonic development, the conceptus is exposed to varying levels of O2. Oxygen and redox-sensitive elements can be regulated to promote normal development, defined as changes to cellular mass, morphology, biochemistry, and function, suggesting that O2 is a developmental morphogen. During periods of O2 fluctuation, embryos are "reprogrammed," on the genomic and metabolic levels. Reprogramming imparts changes to particular redox couples (nodes) that would support specific post-translational modifications (PTMs), targeting the cysteine proteome to regulate protein function and development. Critical Issues: Major developmental events such as stem cell expansion, proliferation, differentiation, migration, and cell fate decisions are controlled through oxidative PTMs of cysteine-based redox nodes. As such, timely coordinated redox regulation of these events yields normal developmental outcomes and viable species reproduction. Disruption of normal redox signaling can produce adverse developmental outcomes. Future Directions: Furthering our understanding of the redox-sensitive processes/pathways, the nature of the regulatory PTMs involved in development and periods of activation/sensitivity to specific developmental pathways would greatly support the theory of redox regulation of development, and would also provide rationale and direction to more fully comprehend poor developmental outcomes, such as dysmorphogenesis, functional deficits, and preterm embryonic death.
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Affiliation(s)
- Jason M. Hansen
- Department of Physiology and Developmental Biology, Brigham Young University, Provo, Utah
| | - Dean P. Jones
- Department of Medicine, Division of Pulmonary, Allergy and Critical Care Medicine, School of Medicine, Emory University, Atlanta, Georgia
| | - Craig Harris
- Toxicology Program, Department of Environmental Sciences, University of Michigan, Ann Arbor, Michigan
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Timme-Laragy AR, Hahn ME, Hansen JM, Rastogi A, Roy MA. Redox stress and signaling during vertebrate embryonic development: Regulation and responses. Semin Cell Dev Biol 2018; 80:17-28. [PMID: 28927759 PMCID: PMC5650060 DOI: 10.1016/j.semcdb.2017.09.019] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 09/08/2017] [Accepted: 09/11/2017] [Indexed: 12/21/2022]
Abstract
Vertebrate embryonic development requires specific signaling events that regulate cell proliferation and differentiation to occur at the correct place and the correct time in order to build a healthy embryo. Signaling pathways are sensitive to perturbations of the endogenous redox state, and are also susceptible to modulation by reactive species and antioxidant defenses, contributing to a spectrum of passive vs. active effects that can affect redox signaling and redox stress. Here we take a multi-level, integrative approach to discuss the importance of redox status for vertebrate developmental signaling pathways and cell fate decisions, with a focus on glutathione/glutathione disulfide, thioredoxin, and cysteine/cystine redox potentials and the implications for protein function in development. We present a tissue-specific example of the important role that reactive species play in pancreatic development and metabolic regulation. We discuss NFE2L2 (also known as NRF2) and related proteins, their roles in redox signaling, and their regulation of glutathione during development. Finally, we provide examples of xenobiotic compounds that disrupt redox signaling in the context of vertebrate embryonic development. Collectively, this review provides a systems-level perspective on the innate and inducible antioxidant defenses, as well as their roles in maintaining redox balance during chemical exposures that occur in critical windows of development.
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Affiliation(s)
- Alicia R Timme-Laragy
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, Amherst, MA 01003, USA.
| | - Mark E Hahn
- Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA
| | - Jason M Hansen
- Department of Physiology and Developmental Biology, Brigham Young University, Provo, UT 84602, USA
| | - Archit Rastogi
- Molecular & Cellular Biology Graduate Program, University of Massachusetts, Amherst, MA 01003, USA
| | - Monika A Roy
- Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, Amherst, MA 01003, USA; Biotechnology Training Program, University of Massachusetts, Amherst, MA 01003, USA
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Peoples JNR, Maxmillian T, Le Q, Nadtochiy SM, Brookes PS, Porter GA, Davidson VL, Ebert SN. Metabolomics reveals critical adrenergic regulatory checkpoints in glycolysis and pentose-phosphate pathways in embryonic heart. J Biol Chem 2018. [PMID: 29540484 DOI: 10.1074/jbc.ra118.002566] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Cardiac energy demands during early embryonic periods are sufficiently met through glycolysis, but as development proceeds, the oxidative phosphorylation in mitochondria becomes increasingly vital. Adrenergic hormones are known to stimulate metabolism in adult mammals and are essential for embryonic development, but relatively little is known about their effects on metabolism in the embryonic heart. Here, we show that embryos lacking adrenergic stimulation have ∼10-fold less cardiac ATP compared with littermate controls. Despite this deficit in steady-state ATP, neither the rates of ATP formation nor degradation was affected in adrenergic hormone-deficient hearts, suggesting that ATP synthesis and hydrolysis mechanisms were fully operational. We thus hypothesized that adrenergic hormones stimulate metabolism of glucose to provide chemical substrates for oxidation in mitochondria. To test this hypothesis, we employed a metabolomics-based approach using LC/MS. Our results showed glucose 1-phosphate and glucose 6-phosphate concentrations were not significantly altered, but several downstream metabolites in both glycolytic and pentose-phosphate pathways were significantly lower compared with controls. Furthermore, we identified glyceraldehyde-3-phosphate dehydrogenase and glucose-6-phosphate dehydrogenase as key enzymes in those respective metabolic pathways whose activity was significantly (p < 0.05) and substantially (80 and 40%, respectively) lower in adrenergic hormone-deficient hearts. Addition of pyruvate and to a lesser extent ribose led to significant recovery of steady-state ATP concentrations. These results demonstrate that without adrenergic stimulation, glucose metabolism in the embryonic heart is severely impaired in multiple pathways, ultimately leading to insufficient metabolic substrate availability for successful transition to aerobic respiration needed for survival.
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Affiliation(s)
- Jessica N R Peoples
- From the Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, University of Central Florida, College of Medicine, Orlando, Florida 32827
| | - Timmi Maxmillian
- From the Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, University of Central Florida, College of Medicine, Orlando, Florida 32827
| | - Quynh Le
- From the Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, University of Central Florida, College of Medicine, Orlando, Florida 32827
| | - Sergiy M Nadtochiy
- the Department of Anesthesiology, University of Rochester Medical Center, Rochester, New York 14620, and
| | - Paul S Brookes
- From the Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, University of Central Florida, College of Medicine, Orlando, Florida 32827
| | - George A Porter
- the Department of Pediatrics, Division of Cardiology, University of Rochester Medical Center, Rochester, New York 14642
| | - Victor L Davidson
- From the Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, University of Central Florida, College of Medicine, Orlando, Florida 32827
| | - Steven N Ebert
- From the Burnett School of Biomedical Sciences, Division of Metabolic and Cardiovascular Sciences, University of Central Florida, College of Medicine, Orlando, Florida 32827,
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Adverse effects in kidney function, antioxidant systems and histopathology in rats receiving monosodium glutamate diet. ACTA ACUST UNITED AC 2017; 69:547-556. [DOI: 10.1016/j.etp.2017.03.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 01/24/2017] [Accepted: 03/21/2017] [Indexed: 12/24/2022]
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Contini MDC, Millen N, González M, Benmelej A, Fabro A, Mahieu S. Orchiectomy attenuates oxidative stress induced by aluminum in rats. Toxicol Ind Health 2015; 32:1515-1526. [PMID: 25647811 DOI: 10.1177/0748233714566876] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The aim of this work was to study whether the increase in antioxidant defenses associated with orchiectomy may account for the reduced susceptibility to aluminum (Al) in male kidney and also to examine whether the reduced antioxidant defenses are associated with androgen levels in orchiectomized (ORX) rats treated with testosterone propionate (TP). Rats were divided into nine groups, namely, intact males (without treatment, treated with sodium lactate, and treated with Al), sham males, ORX males (without treatment, treated with sodium lactate, treated with TP, treated with Al, and treated with TP and Al). Al groups were chronically treated with aluminum lactate for 12 weeks (0.575 mg Al/100 g of body weight, intraperitoneally, three times per week). We reported that ORX rats treated with Al had significantly less lipid peroxidation and an increased level of reduced glutathione (GSH) and GSH/oxidized glutathione ratio in the kidney when compared with intact and TP-treated ORX rats. The activity of superoxide dismutase, catalase, and glutathione peroxidase in ORX rats was much greater than in intact or TP-administered ORX rats. Castration reduced the glomerular alterations caused by Al as well as the number of necrotic tubular cells and nuclear abnormalities. However, we observed a slight alteration in brush border, dilation of proximal tubules, mononuclear infiltrates, and interstitial fibrosis. Castrated males treated with TP showed that this intervention cancels the protective effect of the ORX. This finding suggests that androgens contribute to the development of renal alterations and proteinuria in rats treated with Al. Our results showed that ORX rats are protected against the induction of oxidative stress by Al, but the morphological damage to the kidney tissue induced by the cation was only reduced. Male intact rats treated with Al had more severe glomerulosclerosis, tubular damage, and proteinuria than ORX rats.
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Affiliation(s)
- María Del Carmen Contini
- Facultad de Bioquímica y Ciencias Biológicas (FBCB), Universidad Nacional del Litoral (UNL), Santa Fe, Argentina
| | - Néstor Millen
- Facultad de Bioquímica y Ciencias Biológicas (FBCB), Universidad Nacional del Litoral (UNL), Santa Fe, Argentina
| | - Marcela González
- Facultad de Bioquímica y Ciencias Biológicas (FBCB), Universidad Nacional del Litoral (UNL), Santa Fe, Argentina
| | - Adriana Benmelej
- Facultad de Bioquímica y Ciencias Biológicas (FBCB), Universidad Nacional del Litoral (UNL), Santa Fe, Argentina
| | - Ana Fabro
- Facultad de Bioquímica y Ciencias Biológicas (FBCB), Universidad Nacional del Litoral (UNL), Santa Fe, Argentina
| | - Stella Mahieu
- Facultad de Bioquímica y Ciencias Biológicas (FBCB), Universidad Nacional del Litoral (UNL), Santa Fe, Argentina
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Hansen JM, Harris C. Glutathione during embryonic development. Biochim Biophys Acta Gen Subj 2014; 1850:1527-42. [PMID: 25526700 DOI: 10.1016/j.bbagen.2014.12.001] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Revised: 11/19/2014] [Accepted: 12/01/2014] [Indexed: 12/12/2022]
Abstract
BACKGROUND Glutathione (GSH) is a ubiquitous, non-protein biothiol in cells. It plays a variety of roles in detoxification, redox regulation and cellular signaling. Many processes that can be regulated through GSH are critical to developing systems and include cellular proliferation, differentiation and apoptosis. Understanding how GSH functions in these aspects can provide insight into how GSH regulates development and how during periods of GSH imbalance how these processes are perturbed to cause malformation, behavioral deficits or embryonic death. SCOPE OF REVIEW Here, we review the GSH system as it relates to events critical for normal embryonic development and differentiation. MAJOR CONCLUSIONS This review demonstrates the roles of GSH extend beyond its role as an antioxidant but rather GSH acts as a mediator of numerous processes through its ability to undergo reversible oxidation with cysteine residues in various protein targets. Shifts in GSH redox potential cause an increase in S-glutathionylation of proteins to change their activity. As such, redox potential shifts can act to modify protein function on a possible longer term basis. A broad group of targets such as kinases, phosphatases and transcription factors, all critical to developmental signaling, is discussed. GENERAL SIGNIFICANCE Glutathione regulation of redox-sensitive events is an overlying theme during embryonic development and cellular differentiation. Various stresses can change GSH redox states, we strive to determine developmental stages of redox sensitivity where insults may have the most impactful damaging effect. In turn, this will allow for better therapeutic interventions and preservation of normal developmental signaling. This article is part of a Special Issue entitled Redox regulation of differentiation and de-differentiation.
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Affiliation(s)
- Jason M Hansen
- Department of Physiology and Developmental Biology, College of Life Sciences, Brigham Young University, Provo, UT 84602, United States.
| | - Craig Harris
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI 40109-2029, United States
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Hansen JM, Harris C. Redox control of teratogenesis. Reprod Toxicol 2013; 35:165-79. [DOI: 10.1016/j.reprotox.2012.09.004] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Revised: 09/17/2012] [Accepted: 09/20/2012] [Indexed: 01/19/2023]
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Kleinstreuer NC, Judson RS, Reif DM, Sipes NS, Singh AV, Chandler KJ, Dewoskin R, Dix DJ, Kavlock RJ, Knudsen TB. Environmental impact on vascular development predicted by high-throughput screening. ENVIRONMENTAL HEALTH PERSPECTIVES 2011; 119:1596-603. [PMID: 21788198 PMCID: PMC3226499 DOI: 10.1289/ehp.1103412] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 07/25/2011] [Indexed: 05/07/2023]
Abstract
BACKGROUND Understanding health risks to embryonic development from exposure to environmental chemicals is a significant challenge given the diverse chemical landscape and paucity of data for most of these compounds. High-throughput screening (HTS) in the U.S. Environmental Protection Agency (EPA) ToxCast™ project provides vast data on an expanding chemical library currently consisting of > 1,000 unique compounds across > 500 in vitro assays in phase I (complete) and Phase II (under way). This public data set can be used to evaluate concentration-dependent effects on many diverse biological targets and build predictive models of prototypical toxicity pathways that can aid decision making for assessments of human developmental health and disease. OBJECTIVE We mined the ToxCast phase I data set to identify signatures for potential chemical disruption of blood vessel formation and remodeling. METHODS ToxCast phase I screened 309 chemicals using 467 HTS assays across nine assay technology platforms. The assays measured direct interactions between chemicals and molecular targets (receptors, enzymes), as well as downstream effects on reporter gene activity or cellular consequences. We ranked the chemicals according to individual vascular bioactivity score and visualized the ranking using ToxPi (Toxicological Priority Index) profiles. RESULTS Targets in inflammatory chemokine signaling, the vascular endothelial growth factor pathway, and the plasminogen-activating system were strongly perturbed by some chemicals, and we found positive correlations with developmental effects from the U.S. EPA ToxRefDB (Toxicological Reference Database) in vivo database containing prenatal rat and rabbit guideline studies. We observed distinctly different correlative patterns for chemicals with effects in rabbits versus rats, despite derivation of in vitro signatures based on human cells and cell-free biochemical targets, implying conservation but potentially differential contributions of developmental pathways among species. Follow-up analysis with antiangiogenic thalidomide analogs and additional in vitro vascular targets showed in vitro activity consistent with the most active environmental chemicals tested here. CONCLUSIONS We predicted that blood vessel development is a target for environmental chemicals acting as putative vascular disruptor compounds (pVDCs) and identified potential species differences in sensitive vascular developmental pathways.
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Affiliation(s)
- Nicole C Kleinstreuer
- National Center for Computational Toxiciology, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA.
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l-carnitine protects plasma components against oxidative alterations. Nutrition 2011; 27:693-9. [DOI: 10.1016/j.nut.2010.06.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2010] [Revised: 05/17/2010] [Accepted: 06/11/2010] [Indexed: 11/22/2022]
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Sweeting JN, Siu M, Wiley MJ, Wells PG. Species- and strain-dependent teratogenicity of methanol in rabbits and mice. Reprod Toxicol 2011; 31:50-8. [DOI: 10.1016/j.reprotox.2010.09.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 09/11/2010] [Accepted: 09/28/2010] [Indexed: 10/18/2022]
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Ufer C, Wang CC, Borchert A, Heydeck D, Kuhn H. Redox control in mammalian embryo development. Antioxid Redox Signal 2010; 13:833-75. [PMID: 20367257 DOI: 10.1089/ars.2009.3044] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The development of an embryo constitutes a complex choreography of regulatory events that underlies precise temporal and spatial control. Throughout this process the embryo encounters ever changing environments, which challenge its metabolism. Oxygen is required for embryogenesis but it also poses a potential hazard via formation of reactive oxygen and reactive nitrogen species (ROS/RNS). These metabolites are capable of modifying macromolecules (lipids, proteins, nucleic acids) and altering their biological functions. On one hand, such modifications may have deleterious consequences and must be counteracted by antioxidant defense systems. On the other hand, ROS/RNS function as essential signal transducers regulating the cellular phenotype. In this context the combined maternal/embryonic redox homeostasis is of major importance and dysregulations in the equilibrium of pro- and antioxidative processes retard embryo development, leading to organ malformation and embryo lethality. Silencing the in vivo expression of pro- and antioxidative enzymes provided deeper insights into the role of the embryonic redox equilibrium. Moreover, novel mechanisms linking the cellular redox homeostasis to gene expression regulation have recently been discovered (oxygen sensing DNA demethylases and protein phosphatases, redox-sensitive microRNAs and transcription factors, moonlighting enzymes of the cellular redox homeostasis) and their contribution to embryo development is critically reviewed.
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Affiliation(s)
- Christoph Ufer
- Institute of Biochemistry, University Medicine Berlin-Charité, Berlin, FR Germany
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Ozolins̆ TR. Cyclophosphamide and the Teratology society: an awkward marriage. ACTA ACUST UNITED AC 2010; 89:289-99. [DOI: 10.1002/bdrb.20255] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
Blood platelets, in analogy to other circulating blood cells, can generate reactive oxygen/nitrogen species (ROS/RNS) that may behave as second messengers and may regulate platelet functions. Accumulating evidence suggest a role of ROS/RNS in platelet activation. On the other hand, an increased production of ROS/RNS causes oxidative stress, and thus, may contribute to the development of different diseases, including vascular complications, inflammatory and psychiatric illnesses. Oxidative stress in platelets leads to chemical changes in a wide range of their components, and platelet proteins may be initial targets of ROS/RNS action. It has been demonstrated that reaction of proteins with ROS/RNS results in the oxidation and nitration of some amino acid residues, formation of aggregates or fragmentation of proteins. In oxidized proteins new carbonyl groups and protein hydroperoxides are also formed. In platelets, low molecular weight thiols such as glutathione (GSH), cysteine and cysteinylglycine and protein thiols may be also target for ROS/RNS action. This review describes the chemical structure and biological activities of reactive nitrogen species, mainly nitric oxide ((*)NO) and peroxynitrite (ONOO(-)) and their effects on blood platelet functions, and the mechanisms involved in their action on platelets.
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Affiliation(s)
- Beata Olas
- Department of General Biochemistry, Institute of Biochemistry, University of Łódź, Banacha 12/16, 90-237 Łódź, Poland.
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Dietrich-Muszalska A, Olas B. Modifications of blood platelet proteins of patients with schizophrenia. Platelets 2009; 20:90-6. [PMID: 19235050 DOI: 10.1080/09537100802641499] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Oxidative damage to lipids in plasma, blood platelets and neurons in patients with schizophrenia was described. The aim of our present study was to evaluate oxidative/nitrative modifications of blood platelets proteins by measurement the level of biomarkers of oxidative stress such as carbonyl groups, thiol groups and 3-nitrotyrosine in proteins in patients with schizophrenia and compare with a control group. Levels of carbonyl groups and 3-nitrotyrosine residues in platelet proteins were measured by ELISA and competition ELISA, respectively. The method with 5,5'-dithio-bis(2-nitro-benzoic acid) has been used to analyse thiol groups in platelet proteins. We demonstrated for the first time in platelet proteins from patients with schizophrenia a statistically significant increase of the level of biomarkers of oxidative/nitrative stress such as carbonyl groups or 3-nitrotyrosine; in schizophrenic patients the amount of thiol groups in platelet proteins was lower than in platelets from healthy subjects. Our results strongly indicate that in patients with schizophrenia reactive oxygen species and reactive nitrogen species induce not only peroxidation of lipids, but also may stimulate oxidative/nitrative modifications of platelet proteins. The consequence of these modifications may be the alteration of platelet protein structure and function.
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Oxidative/nitrative modification of blood platelet proteins induced by thrombin in vitro. Thromb Res 2009; 123:758-62. [DOI: 10.1016/j.thromres.2008.09.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 09/12/2008] [Accepted: 09/30/2008] [Indexed: 11/23/2022]
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Abstract
Oxygen radicals, or reactive oxygen species (ROS) act as primary or secondary messengers to promote cell growth or death. Many instances demonstrate an important direct role of ROS in development because redox status regulates key transcription factors that influence cell signaling pathways involved in proliferation, differentiation, and apoptosis. Therefore, oxidative stress can alter many important reactions that affect embryonic development both positively and negatively. During particular periods in development, the embryo is more or less susceptible to oxidative stress, and teratogens, which can modify redox status, such as thalidomide, phenytoin, and ethanol, will disrupt fetal development. Various events in pregnancy such as diabetes also alter the redox state. Fortunately, antioxidants can obviate these effects through modification of gene expression, transcription factor signaling, and cell cycle alterations. A better understanding of ROS-mediated reactions and their impact on embryonic development is important to ensure optimal outcomes.
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Affiliation(s)
- Phyllis A Dennery
- Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA.
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Ugochukwu NH, Figgers CL. Attenuation of plasma dyslipidemia and oxidative damage by dietary caloric restriction in streptozotocin-induced diabetic rats. Chem Biol Interact 2007; 169:32-41. [PMID: 17580083 DOI: 10.1016/j.cbi.2007.05.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2006] [Revised: 05/13/2007] [Accepted: 05/14/2007] [Indexed: 10/23/2022]
Abstract
Oxidative stress has been proposed as the pathogenic mechanism linking insulin resistance with endothelial dysfunction during diabetes. The present study investigated the attenuation of plasma dyslipidemia and oxidative damage by caloric restriction in experimental diabetes. Forty male Wistar rats were divided into ad libitum and calorie-restricted groups. The calorie-restricted group was subjected to 30% caloric restriction for 63 days before induction of diabetes to 50% of both groups. Caloric restriction significantly (p<0.01) reduced the body weights, reactive oxygen species (ROS), catalase, total cholesterol levels and non-significantly reduced SOD activities in non-diabetic and diabetic rats. Caloric restriction was also found to improve blood glucose levels, glycated hemoglobin, malondialdehyde, triglyceride, oxidized glutathione and reduced glutathione levels and significantly (p<0.05) increased GPx and GR activities in the experimental animals. The non-diabetic rats fed ad libitum had the most significant increases in body weight which could be due to dyslipidemia. These results indicate that dietary caloric restriction attenuates the oxidative damage and dyslipidemia exacerbated during diabetes as evidenced by the significant reduction in their body weights, ROS, total cholesterol levels and the increases in GPx activity and redox status.
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Affiliation(s)
- Ngozi H Ugochukwu
- Department of Chemistry, Florida A&M University, Tallahassee, FL 32307, USA.
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Abstract
Emerging evidence shows that redox-sensitive signal transduction pathways are critical for developmental processes, including proliferation, differentiation, and apoptosis. As a consequence, teratogens that induce oxidative stress (OS) may induce teratogenesis via the misregulation of these same pathways. Many of these pathways are regulated by cellular thiol redox couples, namely glutathione/glutathione disulfide, thioredoxinred/thioredoinox, and cysteine/cystine. This review outlines oxidative stress as a mechanism of teratogenesis through the disruption of thiol-mediated redox signaling. Due to the ability of many known and suspected teratogens to induce oxidative stress and the many signaling pathways that have redox-sensitive components, further research is warranted to fully understand these mechanisms.
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Affiliation(s)
- Jason M Hansen
- Department of Pediatrics, Emory School of Medicine, Emory University, Atlanta, Georgia 30322, USA.
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Saluk-Juszczak J, Wachowicz B, Wójtowicz H, Kloc K, Bald E, Glowacki R. Novel selenoorganic compounds as modulators of oxidative stress in blood platelets. Cell Biol Toxicol 2006; 22:323-9. [PMID: 16845609 DOI: 10.1007/s10565-006-0091-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2006] [Accepted: 05/01/2006] [Indexed: 11/27/2022]
Abstract
Many selenoorganic compounds play an important role in biochemical processes and act as antioxidants, enzyme inhibitors, or drugs. The effects of five new synthesized selenoorganic compounds (2-(5-chloro-2-pyridyl)-7-azabenzisoselenazol-3(2H)-one; 2-phenyl-7-azabenzisoselenazol-3(2H)-one; 2-(pyridyl)-7-azabenzisoselenazol-3(2H)-one; 7-azabenzisoselenazol-3(2H)-one; bis(2-aminophenyl) diselenide) on oxidative changes in human blood platelets and in plasma were studied in vitro and compared with those of ebselen, a well known antioxidant. Our studies demonstrated that bis(2-aminophenyl) diselenide has distinctly protective effects against oxidative stress in blood platelets and in plasma. It might have greater biological relevance and stronger pharmacological effects than ebselen.
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Affiliation(s)
- J Saluk-Juszczak
- Department of General Biochemistry, University of Lodz, Banacha 12/16, 90-237, Lodz, Poland.
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Ichiseki T, Kaneuji A, Kitamura K, Matsumoto T. Does oxidative stress play a role in steroid-induced osteonecrosis models? Med Hypotheses 2006; 66:1048. [PMID: 16413136 DOI: 10.1016/j.mehy.2005.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2005] [Accepted: 08/22/2005] [Indexed: 10/25/2022]
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Hansen JM, Contreras KM, Harris C. Methanol, formaldehyde, and sodium formate exposure in rat and mouse conceptuses: a potential role of the visceral yolk sac in embryotoxicity. ACTA ACUST UNITED AC 2005; 73:72-82. [PMID: 15578646 DOI: 10.1002/bdra.20094] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Methanol (CH3OH) is believed to be teratogenic based on rodent studies. The mouse is more sensitive than the rat, but mechanisms of toxicity and identification of teratogenic metabolites are uncertain. METHODS Rat and mouse whole embryo cultures are used to distinguish toxicity of CH3OH and its metabolites, formaldehyde (HCHO) and formate (HCOONa), which are produced following transit through the visceral yolk sac (VYS), via addition to culture medium, or by direct embryonic exposure through microinjection into the amnion. RESULTS Embryonic viability, increased dysmorphogenesis, and decreased growth parameters were altered in a dose-dependent fashion for each compound. Mouse embryos were more sensitive than rat, as indicated by significant decreases in viability at comparable, lower concentrations. HCHO produced dysmorphogenesis and caused embryolethality at nearly 1000-fold lower concentrations (0.004 mg/ml) than seen with either CH3OH or HCOONa. All agents produced incomplete axial rotation and delayed neural tube closure in mice, but only CH3OH elicited similar effects in the rat. Increased growth retardation, blood pooling in the head and VYS, enlarged pericardium, accumulation of necrotic matter in the amnion, and hypoplastic prosencephalon were observed in both species with all compounds. Microinjection of compounds into the amnion produced higher mortality in mouse and rat, compared to equimolar amounts added to the culture medium. CH3OH did not prevent neural tube closure in the rat when microinjected. CONCLUSIONS HCHO is the most embryotoxic CH3OH metabolite and elicits the entire spectrum of lesions produced by CH3OH. The VYS serves a general protective role against toxicity and inherent differences in the embryonic metabolism of CH3OH may determine species sensitivity.
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Affiliation(s)
- Jason M Hansen
- Department of Biochemistry, School of Medicine, Emory University, Atlanta, Georgia, USA
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Saluk-Juszczak J, Wachowicz B, Bald E, Gowacki R. Effects of lipopolysaccharides from gram-negative bacteria on the level of thiols in blood platelets. Curr Microbiol 2005; 51:153-5. [PMID: 16049662 DOI: 10.1007/s00284-005-4461-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2004] [Accepted: 02/16/2005] [Indexed: 10/25/2022]
Abstract
Lipopolysaccharide (endotoxin, LPS) activates blood platelets and stimulates generation of free radicals in these cells. The mechanism of platelet activation induced by LPS is not known. The aim of the present study was to examine how glutathione (GSH) and other thiol-containing compounds are involved in the oxidative stress in blood platelets caused by LPS. The HPLC technique has been used on the analysis of non-protein thiols from human blood platelets treated with lipopolysaccharides of different gram-negative bacteria (Proteus mirabilis, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa). Our results show that LPSs caused an increase (about 10%) of the level of reduced glutathione (GSH) and other nonprotein thiols such as cysteine (CSH) and cysteinylglycine (CGSH), whereas the total pool of these compounds was almost unchanged. LPS may react directly with thiols, since after incubation of LPSs with glutathione alone (in reduced form) we observed a distinct decrease of the level of platelet GSH.
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Affiliation(s)
- Joanna Saluk-Juszczak
- Department of General Biochemistry, University of Lodz, Banacha 12/16, 90-237, Lodz, Poland.
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Nowak P, Olas B, Bald E, Głowacki R, Wachowicz B. Peroxynitrite-induced changes of thiol groups in human blood platelets. Platelets 2004; 14:375-9. [PMID: 14602551 DOI: 10.1080/0953710032000141400] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
In this study we investigated sulfhydryl and disulfide metabolism in blood platelets treated with peroxynitrite (ONOO-) at concentrations of 10, 100, and 1000 microM. In platelets incubated with peroxynitrite, a decrease of both protein and low molecular weight thiols (glutathione, cysteine and cysteinylglycine) was observed. The reduction of platelet free thiols caused by ONOO- was dose dependent. We found that peroxynitrite induces the oxidation of platelet free SH-groups. Platelets contain a large fraction of glutathione in reduced form (GSH). We showed that after ONOO- treatment, GSH/GSSG ratio in platelets was distinctly decreased. The presented results suggest that oxidation of thiols and depletion of GSH in platelets caused by peroxynitrite may be responsible for cytotoxic effects of this compound.
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Affiliation(s)
- Paweł Nowak
- Department of General Biochemistry, University of Łódź, Poland.
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Lapenna D, Pierdomenico SD, Ciofani G, Giamberardino MA, Cuccurullo F. Aortic glutathione metabolic status: time-dependent alterations in fat-fed rabbits. Atherosclerosis 2004; 173:19-25. [PMID: 15177120 DOI: 10.1016/j.atherosclerosis.2003.11.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2002] [Revised: 11/04/2003] [Accepted: 11/14/2003] [Indexed: 11/20/2022]
Abstract
Little is known about the vascular metabolic status of glutathione (GSH), which is crucial in cell antioxidant protection, in experimental conditions like high-fat diet-induced atherosclerosis. This issue was, therefore, investigated in two groups of seven rabbits fed a 0.5% cholesterol-, 5% lard- and 5% peanut oil-enriched diet for 18 and 80 days, which, respectively, raised the plasma values of total cholesterol by factors of about 12 and 37, and those of triglycerides by factors of 3 and 13; rabbits fed a standard diet for the same periods served as controls. Total GSH and the activities of the GSH level-maintaining enzymes glutathione reductase (GSSG-Red), gamma-glutamylcysteine synthetase (gamma-GCS) and gamma-glutamyl transpeptidase (gamma-GT) were specifically assessed in the aortic tissue, which was also assayed for fluorescent damage products of lipid peroxidation (FDPL). Sudan red staining of the aortic intima surface was also performed in two other groups of six controls and six fat-fed rabbits. After 18 days of fat feeding, a significant decrement of aortic GSSG-Red activity, associated with gamma-GCS activation, increased GSH levels and normal gamma-GT activity, was observed; FDPL were only moderately enhanced, and atherosclerotic lesions did not occur. After 80 days of atherogenic diet, aortic GSH content was significantly decreased in concomitance with a marked depression of gamma-GT activity, while GSSG-Red and gamma-GCS activities were not significantly changed with respect to 18 days of fat feeding; FDPL underwent further considerable augmentation, and extensive Sudan red-stained atherosclerotic lesions were evident. Thus, short-term fat feeding induces gamma-GCS-dependent GSH biosynthesis of the rabbit aorta; prolonged high-fat intake and hyperlipidemic burden result instead in vascular gamma-GT dysfunction with GSH depletion, eventually favoring oxidative atherogenic effects.
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Affiliation(s)
- Domenico Lapenna
- Dipartimento di Medicina e Scienze dell'Invecchiamento, Facolta' di Medicina e Chirurgia, Centro di Scienze dell'Invecchiamento-Fondazione Universita' G. Annunzio, c/o Policlinico di Colle dell'Ara, Chieti Scalo, Italy.
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Peña-Llopis S, Ferrando MD, Peña JB. Fish tolerance to organophosphate-induced oxidative stress is dependent on the glutathione metabolism and enhanced by N-acetylcysteine. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2003; 65:337-360. [PMID: 14568351 DOI: 10.1016/s0166-445x(03)00148-6] [Citation(s) in RCA: 172] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Dichlorvos (2,2-dichlorovinyl dimethyl phosphate, DDVP) is an organophosphorus (OP) insecticide and acaricide extensively used to treat external parasitic infections of farmed fish. In previous studies we have demonstrated the importance of the glutathione (GSH) metabolism in the resistance of the European eel (Anguilla anguilla L.) to thiocarbamate herbicides. The present work studied the effects of the antioxidant and glutathione pro-drug N-acetyl-L-cysteine (NAC) on the survival of a natural population of A. anguilla exposed to a lethal concentration of dichlorvos, focusing on the glutathione metabolism and the enzyme activities of acetylcholinesterase (AChE) and caspase-3 as biomarkers of neurotoxicity and induction of apoptosis, respectively. Fish pre-treated with NAC (1 mmol kg(-1), i.p.) and exposed to 1.5 mg l(-1) (the 96-h LC85) of dichlorvos for 96 h in a static-renewal system achieved an increase of the GSH content, GSH/GSSG ratio, hepatic glutathione reductase (GR), glutathione S-transferase (GST), glutamate:cysteine ligase (GCL), and gamma-glutamyl transferase (gammaGT) activities, which ameliorated the glutathione loss and oxidation, and enzyme inactivation, caused by the OP pesticide. Although NAC-treated fish presented a higher survival and were two-fold less likely to die within the study period of 96 h, Cox proportional hazard models showed that hepatic GSH/GSSG ratio was the best explanatory variable related to survival. Hence, tolerance to a lethal concentration of dichlorvos can be explained by the individual capacity to maintain and improve the hepatic glutathione redox status. Impairment of the GSH/GSSG ratio can lead to excessive oxidative stress and inhibition of caspase-3-like activity, inducing cell death by necrosis, and, ultimately, resulting in the death of the organism. We therefore propose a reconsideration of the individual effective dose or individual tolerance concept postulated by Gaddum 50 years ago for the log-normal dose-response relationship. In addition, as NAC increased the tolerance to dichlorvos, it could be a potential antidote for OP poisoning, complementary to current treatments.
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Affiliation(s)
- Samuel Peña-Llopis
- Institute of Aquaculture Torre de la Sal (CSIC), E-12595 Ribera de Cabanes, Castellón, Spain.
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Ugochukwu NH, Cobourne MK. Modification of renal oxidative stress and lipid peroxidation in streptozotocin-induced diabetic rats treated with extracts from Gongronema latifolium leaves. Clin Chim Acta 2003; 336:73-81. [PMID: 14500037 DOI: 10.1016/s0009-8981(03)00325-5] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Gongronema latifolium is a tropical plant traditionally used in controlling weight gain in lactating women, as well as diabetic and overall health management. In this experiment, the aqueous and ethanolic extracts were tested to evaluate their effect on renal oxidative stress and lipid peroxidation in non-diabetic and streptozotocin-induced diabetic rats. METHODS Diabetes was induced in male Wistar rats by intraperitoneal (i.p.) injection of streptozotocin (STZ) (65 mg/kg). The rats were divided into non-diabetic (18) and STZ-induced diabetic (18) rats, and both groups subdivided according to their treatments: aqueous extract (100 mg/kg), ethanolic extract (100 mg/kg) and control (saline solution). Aqueous and ethanolic extracts were administered by gavage in 12-h cycles over a 14-day period. RESULTS The results indicated that the ethanolic extract significantly normalized catalase (CAT) activity (p<0.01), increased glutathione peroxidase (GPx) activity (p<0.05), and reduced reactive oxygen species (ROS) concentrations (p<0.001). It also nonsignificantly normalized superoxide dismutase (SOD) activity, increased GSH/GSSG ratio and reduced malondialdehyde (MDA) concentrations in the diabetic kidney. The aqueous extract had no effect on the superoxide dismutase activity in the diabetic animals and caused a nonsignificant increase in catalase activity. CONCLUSIONS The ethanolic extract appeared to be more effective in reducing oxidative stress, lipid peroxidation, and increasing the GSH/GSSG ratio, thus confirming the ethnopharmacological use of G. latifolium in ameliorating the oxidative stress found in diabetics and indicating promise of possible use in lessening morbidity in affected individuals.
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Affiliation(s)
- Ngozi H Ugochukwu
- Department of Chemistry, Florida Agricultural and Mechanical University, Tallahassee, FL 32307, USA.
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Hansen JM, Gong SG, Philbert M, Harris C. Misregulation of gene expression in the redox-sensitive NF-kappab-dependent limb outgrowth pathway by thalidomide. Dev Dyn 2003; 225:186-94. [PMID: 12242718 DOI: 10.1002/dvdy.10150] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Thalidomide is known to induce oxidative stress, but mechanisms have not been described through which oxidative stress could contribute to thalidomide-induced terata. Oxidative stress modulates intracellular glutathione (GSH) and redox status and can perturb redox-sensitive processes, such as transcription factor activation and/or binding. Nuclear factor-kappa B (NF-kappaB), a redox-sensitive transcription factor involved in limb outgrowth, may be modulated by thalidomide-induced redox shifts. Thalidomide-resistant Sprague-Dawley rat embryos (gestation day [GD] 13) treated with thalidomide in utero showed no changes in GSH distribution in the limb but thalidomide-sensitive New Zealand White rabbit embryos (GD 12) showed selective GSH depletion in the limb bud progress zone (PZ). NF-kappaB and regulatory genes that initiate and maintain limb outgrowth and development, such as Twist and Fgf-10, are selectively expressed in the PZ. Green fluorescent protein (GFP) reporter vectors containing NF-kappaB binding promoter sites were transfected into both rat and rabbit limb bud cells (LBCs). Treatment with thalidomide caused a preferential decrease in GFP expression in rabbit LBCs but not in rat LBCs. N-acetylcysteine and alpha-N-t-phenylbutyl nitrone (PBN), a free radical trapping agent, rescued GFP expression in thalidomide-treated cultures compared with cultures that received thalidomide only. In situ hybridization showed a preferential decrease in Twist, Fgf-8, and Fgf-10 expression after thalidomide treatment (400 mg/kg per day) in rabbit embryos. Expression in rat embryos was not affected. Intravenous cotreatment with PBN and thalidomide (gavage) in rabbits restored normal patterns and localization of Twist, Fgf-8, and Fgf-10 expression. These findings show that NF-kappaB binding is diminished due to selective thalidomide-induced redox changes in the rabbit, resulting in the significant attenuation of expression of genes necessary for limb outgrowth.
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Affiliation(s)
- Jason M Hansen
- Toxicology Program, Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, Michigan 48109, USA
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Brooke SM, McLaughlin JR, Cortopassi KM, Sapolsky RM. Effect of GP120 on glutathione peroxidase activity in cortical cultures and the interaction with steroid hormones. J Neurochem 2002; 81:277-84. [PMID: 12064474 DOI: 10.1046/j.1471-4159.2002.00825.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
GP120 (the protein component of the HIV viral coat) is neurotoxic and may contribute to the cell loss associated with AIDS-related dementia. Previously, it has been shown in rat cortical mixed cultures that gp120 increased the accumulation of hydrogen peroxide and superoxide, two reactive oxygen species (ROS). We now demonstrate that gp120 increased activity of the key antioxidant glutathione peroxidase (GSPx), presumably as a defensive mechanism against the increased ROS load. Both estrogen and glucocorticoids (GCs), the adrenal steroid released during stress, blunted this gp120 effect on GSPx activity. The similar effects of estrogen and of GCs are superficially surprising, given prior demonstrations that GCs exacerbated and estrogens protected against gp120 neurotoxicity. We find that these similar effects of estrogen and GCs on GSPx regulation arose, in fact, from very different routes, which are commensurate with these prior reports. Specifically, estrogen has demonstrated antioxidant properties that may prevent the ROS increase (therefore acting as a neuroprotective agent) and rendered unnecessary the compensatory GSPx increased activity. To verify this we have added H2O2 to estrogen + gp120-treated cells, and GSPx activity was increased. However, with addition of H2O2 to GCs + gp120-treated cells there was no increase in activity. GCs appeared to decrease enzyme production and or activity and therefore under insult conditions ROS levels rose in the cell resulting in increased neurotoxicity. Overexpression of GSPx enzyme via herpes vector system reversed the GCs-induced loss of enzyme and eliminated the GCs exacerbation of gp120 neurotoxicity.
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Affiliation(s)
- Sheila M Brooke
- Department of Biological Sciences, Stanford University, California 94305-5020, USA.
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