1
|
Abstract
BACKGROUND Chronic heart failure (CHF) is associated with redox imbalance. Downregulation of Nrf2 (nuclear factor [erythroid-derived 2]-like 2) plays important roles in disrupting myocardial redox homeostasis and mediating sympathetic nerve activity in the setting of CHF. However, it is unclear if circulating extracellular vesicles (EVs) elicit sympathetic excitation in CHF by disrupting central redox homeostasis. We tested the hypothesis that cardiac-derived EVs circulate to the presympathetic rostral ventrolateral medulla and contribute to oxidative stress and sympathetic excitation via EV-enriched microRNA-mediated Nrf2 downregulation. METHODS Data were collected on rats with CHF post-myocardial infarction (MI) and on human subjects with ischemic CHF. EVs were isolated from tissue and plasma, and we determined the miRNAs cargo that related to targeting Nrf2 translation. We tracked the distribution of cardiac-derived EVs using in vitro labeled circulating EVs and cardiac-specific membrane GFP+ transgenic mice. Finally, we tested the impact of exogenously loading of antagomirs to specific Nrf2-related miRNAs on CHF-EV-induced pathophysiological phenotypes in normal rats (eg, sympathetic and cardiac function). RESULTS Nrf2 downregulation in CHF rats was associated with an upregulation of Nrf2-targeting miRNAs, which were abundant in cardiac-derived and circulating EVs from rats and humans. EVs isolated from the brain of CHF rats were also enriched with Nrf2-targeting miRNAs and cardiac-specific miRNAs. Cardiac-derived EVs were taken up by neurons in the rostral ventrolateral medulla. The administration of cardiac-derived and circulating EVs from CHF rats into the rostral ventrolateral medulla of normal rats evoked an increase in renal sympathetic nerve activity and plasma norepinephrine compared with Sham-operated rats, which were attenuated by exogenously preloading CHF-EVs with antagomirs to Nrf2-targeting miRNAs. CONCLUSIONS Cardiac microRNA-enriched EVs from animals with CHF can mediate crosstalk between the heart and the brain in the regulation of sympathetic outflow by targeting the Nrf2/antioxidant signaling pathway. This new endocrine signaling pathway regulating sympathetic outflow in CHF may be exploited for novel therapeutics.
Collapse
Affiliation(s)
- Changhai Tian
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536
| | - Lie Gao
- Department of Anesthesiology, University of Nebraska Medical Center, Omaha, NE 68198
| | - Tara L. Rudebush
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198
| | - Li Yu
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198
| | - Irving H. Zucker
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, NE 68198
| |
Collapse
|
2
|
Rotariu D, Babes EE, Tit DM, Moisi M, Bustea C, Stoicescu M, Radu AF, Vesa CM, Behl T, Bungau AF, Bungau SG. Oxidative stress - Complex pathological issues concerning the hallmark of cardiovascular and metabolic disorders. Biomed Pharmacother 2022; 152:113238. [PMID: 35687909 DOI: 10.1016/j.biopha.2022.113238] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/30/2022] [Accepted: 06/02/2022] [Indexed: 12/07/2022] Open
Abstract
Oxidative stress is a complex biological process characterized by the excessive production of reactive oxygen species (ROS) that act as destroyers of the REDOX balance in the body and, implicitly, inducing oxidative damage. All the metabolisms are impaired in oxidative stress and even nucleic acid balance is influenced. ROS will promote structural changes of the tissues and organs due to interaction with proteins and phospholipids. The constellation of the cardiovascular risk factors (CVRFs) will usually develop in subjects with predisposition to cardiac disorders. Oxidative stress is usually related with hypertension (HTN), diabetes mellitus (DM), obesity and cardiovascular diseases (CVDs) like coronary artery disease (CAD), cardiomyopathy or heart failure (HF), that can develop in subjects with the above-mentioned diseases. Elements describing the complex relationship between CVD and oxidative stress should be properly explored and described because prevention may be the optimal approach. Our paper aims to expose in detail the complex physiopathology of oxidative stress in CVD occurrence and novelties regarding the phenomenon. Biomarkers assessing oxidative stress or therapy targeting specific pathways represent a major progress that actually change the outcome of subjects with CVD. New antioxidants therapy specific for each CVD represents a captivating and interesting future perspective with tremendous benefits on subject's outcome.
Collapse
Affiliation(s)
- Dragos Rotariu
- Doctoral School of Biological and Biomedical Sciences, University of Oradea, 410087 Oradea, Romania.
| | - Emilia Elena Babes
- Department of Medical Disciplines, Faculty of Medicine and Pharmacy of Oradea, University of Oradea, 410073 Oradea, Romania.
| | - Delia Mirela Tit
- Doctoral School of Biological and Biomedical Sciences, University of Oradea, 410087 Oradea, Romania; Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, 410028 Oradea, Romania.
| | - Madalina Moisi
- Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy of Oradea, University of Oradea, 410073 Oradea, Romania.
| | - Cristiana Bustea
- Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy of Oradea, University of Oradea, 410073 Oradea, Romania.
| | - Manuela Stoicescu
- Department of Medical Disciplines, Faculty of Medicine and Pharmacy of Oradea, University of Oradea, 410073 Oradea, Romania.
| | - Andrei-Flavius Radu
- Doctoral School of Biological and Biomedical Sciences, University of Oradea, 410087 Oradea, Romania; Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy of Oradea, University of Oradea, 410073 Oradea, Romania.
| | - Cosmin Mihai Vesa
- Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy of Oradea, University of Oradea, 410073 Oradea, Romania.
| | - Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Punjab 140401, India.
| | | | - Simona Gabriela Bungau
- Doctoral School of Biological and Biomedical Sciences, University of Oradea, 410087 Oradea, Romania; Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, 410028 Oradea, Romania.
| |
Collapse
|
3
|
Butein Inhibits Oxidative Stress Injury in Rats with Chronic Heart Failure via ERK/Nrf2 Signaling. Cardiovasc Ther 2022; 2022:8684014. [PMID: 35069800 PMCID: PMC8752302 DOI: 10.1155/2022/8684014] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 12/09/2021] [Indexed: 12/25/2022] Open
Abstract
Background Chronic heart failure (CHF) is a serious heart disease resulting from cardiac dysfunction. Oxidative stress is an important factor in aging and disease. Butein, however, has antioxidant properties. To determine the effect of butein on oxidative stress injury in rats, a CHF rat model was established. Methods The CHF rat model was induced by abdominal aortic coarctation (AAC). Rats in CHF+butein and sham+butein group were given 100 mg/kg butein via gavage every day to detect the effect of butein on oxidative stress injury and myocardial dysfunction. The cardiac structural and functional parameters, including the left ventricular end-systolic dimension (LVESD), the left ventricular end-diastolic dimension (LVEDD), the left ventricular ejection fraction (LVEF), and the left ventricular fractional shortening (LVFS), were measured. Oxidative stress was measured through the production of reactive oxygen species (ROS), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), catalase (CAT), and malondialdehyde (MDA). Cardiac injury markers like creatine kinase-MB (CK-MB), lactate dehydrogenase (LDH), and aspartate aminotransferase (AST) were evaluated. Hematoxylin and eosin (H&E) staining was used to observe the myocardial cell morphology. The effect of butein on the extracellular signal-regulated kinase (ERK)/nuclear factor-E2 p45-related factor (Nrf2) signaling was confirmed by Western blot analysis. Results Butein had a significant effect on CHF in animal models. In detail, butein inhibited oxidative stress, relieved cardiac injury, and alleviated myocardial dysfunction. Importantly, butein activated the ERK1/2 pathway, which contributed to Nrf2 activation and subsequent heme oxygenase-1 (HO-1) and glutathione cysteine ligase regulatory subunit (GCLC) induction. Conclusions In this study, butein inhibits oxidative stress injury in CHF rat model via ERK/Nrf2 signaling pathway.
Collapse
|
4
|
Ying H, Shen Z, Wang J, Zhou B. Role of iron homeostasis in the heart : Heart failure, cardiomyopathy, and ischemia-reperfusion injury. Herz 2021; 47:141-149. [PMID: 33978777 DOI: 10.1007/s00059-021-05039-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 07/15/2020] [Accepted: 04/09/2021] [Indexed: 02/07/2023]
Abstract
As an essential trace mineral in mammals and the second most abundant metal in the Earth's crust, iron acts as a double-edged sword in humans. Iron plays important beneficial roles in numerous biological processes ranging from deoxyribonucleic acid biosynthesis and protein function to cell cycle progression. However, iron metabolism disruption leads to widespread tissue degeneration and organ dysfunction. An increasing number of studies have focused on iron regulation pathways and have explored the relationship between iron and cardiovascular diseases. Ferroptosis, an iron-dependent form of programmed cell death, was first described in cancer cells and has recently been linked to heart diseases, including cardiac ischemia-reperfusion injury and doxorubicin-induced myocardiopathy. Here, we summarize recent advances in our understanding of iron homeostasis and heart diseases and discuss potential relationships between ferroptosis and cardiac ischemia-reperfusion injury and cardiomyopathy.
Collapse
Affiliation(s)
- Hangying Ying
- Department of Cardiology, Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, 310016, Zhejiang, Hangzhou, China
| | - Zhida Shen
- Department of Cardiology, Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, 310016, Zhejiang, Hangzhou, China
| | - Jiacheng Wang
- Department of Cardiology, Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, 310016, Zhejiang, Hangzhou, China
| | - Binquan Zhou
- Department of Cardiology, Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang Province, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, 310016, Zhejiang, Hangzhou, China.
| |
Collapse
|
5
|
Polysaccharides from Hemp Seed Protect against Cyclophosphamide-Induced Intestinal Oxidative Damage via Nrf2-Keap1 Signaling Pathway in Mice. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:1813798. [PMID: 32908623 PMCID: PMC7468657 DOI: 10.1155/2020/1813798] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 07/14/2020] [Indexed: 02/04/2023]
Abstract
Hemp seed has been used as a traditional oriental medicine and health food in China for centuries. Polysaccharides from hemp seed (HSP) exhibit important properties of intestinal protection, but there are limited data on the specific underlying mechanism. The primary objective of this study was to investigate the protective effect of HSP on intestinal oxidative damage induced by cyclophosphamide (Cy) in mice. The results showed that pretreatment with HSP significantly increased the average daily gain, thymus index, spleen index, superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) activity in serum and ileal homogenate and significantly reduced malondialdehyde (MDA) content in ileal homogenate. In addition, the expression levels of SOD, GSH-Px, Nrf2, heme oxidase-1 (HO-1), and quinoneoxidoreductase-1 (NQO1) mRNA in ileal homogenate were significantly increased. Western blot results showed that HSP significantly upregulated the expression of Nrf2 protein and downregulated the expression of Keap1 protein in the ileum. Collectively, our findings indicated that HSP had protective effects on intestinal oxidative damage induced by Cy in mice, and its mechanism might be related to the activation of Nrf2-Keap1 signaling pathway.
Collapse
|
6
|
The latency period between type 2 diabetes and development of Coronary Artery Disease based on psychological factors. CLINICAL EPIDEMIOLOGY AND GLOBAL HEALTH 2020. [DOI: 10.1016/j.cegh.2019.08.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
7
|
Tian C, Gao L, Zhang A, Hackfort BT, Zucker IH. Therapeutic Effects of Nrf2 Activation by Bardoxolone Methyl in Chronic Heart Failure. J Pharmacol Exp Ther 2019; 371:642-651. [PMID: 31601682 DOI: 10.1124/jpet.119.261792] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 10/10/2019] [Indexed: 12/19/2022] Open
Abstract
Oxidative stress plays an important role in the pathogenesis of chronic heart failure (CHF) in many tissues. Increasing evidence suggests that systemic activation of nuclear factor (erythroid-derived 2)-like 2 (Nrf2) signaling can protect against postinfarct cardiac remodeling by reducing oxidative stress. However, it remains to be elucidated if Nrf2 activation exerts therapeutic effects in the CHF state. Here, we investigated the beneficial hemodynamic effects of bardoxolone methyl (2-Cyano-3,12-dioxooleana-1,9(11)-dien-28-oic acid methyl ester, CDDO-Me), a pharmacological activator of Nrf2, in a rodent model of CHF. Based on echocardiographic analysis, rats at 12 weeks post-myocardial infarction (MI) were randomly split into four groups. CDDO-Me (5 mg/kg, i.p.) was administered daily for another 2 weeks in sham and CHF rats and compared with vehicle treatment. Echocardiographic and hemodynamic analysis suggest that short-term CDDO-Me administration increased stroke volume and cardiac output in CHF rats and decreased left ventricle end-diastolic pressure. Molecular studies revealed that CDDO-Me-induced cardiac functional improvement was attributed to an increase of both Nrf2 transcription and translation, and a decrease of oxidative stress in the noninfarcted areas of the heart. Furthermore, CDDO-Me reduced NF-κB binding and increased Nrf2 binding to the CREB-binding protein, which may contribute to the selective increase of Nrf2 downstream targets, including NADPH Oxidase Quinone 1, Heme Oxygenase 1, Catalase, and Glutamate-Cysteine Ligase Catalytic Subunit, and the attenuation of myocardial inflammation in CHF rats. Our findings suggest that Nrf2 activation may provide beneficial cardiac effects in MI-mediated CHF. SIGNIFICANCE STATEMENT: Chronic heart failure (CHF) is the leading cause of death among the aged worldwide. The imbalance between pro- and antioxidant pathways is a determinant in the pathogenesis of CHF. Systemic activation of Nrf2 and antioxidant protein signaling by bardoxolone methyl may have beneficial effects on cardiac function and result in improvements by enhancing antioxidant enzyme expression and attenuating myocardial inflammation.
Collapse
Affiliation(s)
- Changhai Tian
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Lie Gao
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Andi Zhang
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Bryan T Hackfort
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| | - Irving H Zucker
- Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, Omaha, Nebraska
| |
Collapse
|
8
|
Micronutrient Deficiency Independently Predicts Adverse Health Outcomes in Patients With Heart Failure. J Cardiovasc Nurs 2018; 32:47-53. [PMID: 26544174 DOI: 10.1097/jcn.0000000000000304] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Despite growing evidence on the important role of micronutrients in prognosis of heart failure (HF), there has been limited research that micronutrient deficiency predicts health outcomes in patients with HF. PURPOSE The aim of this study was to determine whether micronutrient deficiency independently predicts adverse health outcomes. METHODS A total of 113 consecutive outpatients with HF completed a 3-day food diary to measure intake of 15 micronutrients. The Computer Aided Nutrition Analysis Program for Professionals was used to analyze the food diaries and determine dietary micronutrient deficiencies. Patients completed the Minnesota Living With HF Questionnaire to assess health-related quality of life (HRQoL) and were followed up for 1 year to determine cardiac-related hospitalization or cardiac death. Hierarchical multiple linear regressions and Cox proportional hazard regressions were used to determine whether micronutrient deficiencies predicted health outcomes. RESULTS Fifty-eight patients (51%) had at least 3 micronutrient deficiencies (range, 0-14). Calcium, magnesium, and vitamin D were the most common micronutrient deficiencies. Micronutrient deficiency was independently associated with worse HRQoL (β = .187, P = .025) in hierarchical multiple linear regression. Thirty-nine patients were hospitalized or died during 1-year follow-up because of cardiac problems. The number of micronutrient deficiencies independently predicted cardiac event-free survival (hazard ratio, 1.14; 95% confidence interval, 1.02-1.28). CONCLUSIONS These findings show that micronutrient deficiency independently predicted poor HRQoL and earlier cardiac event-free survival in patients with HF. Further research is needed to provide for specific dietary guidelines for better health outcomes in HF patients.
Collapse
|
9
|
|
10
|
Caussé E, Fournier P, Roncalli J, Salvayre R, Galinier M. Serum allantoin and aminothiols as biomarkers of chronic heart failure. Acta Cardiol 2017; 72:397-403. [PMID: 28705092 DOI: 10.1080/00015385.2017.1335104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Background Oxidative stress (OS) represents the primary mediator of chronic heart failure (CHF) development and progression. It is well established that homocysteine is able to generate reactive oxygen species. Small amounts of allantoin in human serum result from free radical action on urate and may provide a stable marker for in vivo free radical activity. To investigate whether some easily measurable indexes such as antioxidants (uric acid, glutathione) and related molecules (allantoin, homocysteine and cysteine) can serve as OS biomarkers. Methods We investigated 75 stable CHF patients. Aminothiols and purine compound levels were determined by capillary electrophoresis. Results The homocysteine level was markedly elevated in CHF patients, whatever the aetiology. Parameters of the transsulfuration pathway and the investigated purine compounds were significantly increased. Conversely, total glutathione was decreased. The allantoin/uric acid ratio was significantly higher in CHF patients with an hyperhomocysteinaemia >17 μmol/L. All parameters of the transsulfuration and purine degadation pathways were significantly correlated, suggesting an OS in CHF patients. Conclusion Our data show an imbalance of serum aminothiols and purine compounds in these CHF patients on adapted therapy. We suggest that the evaluation and control of these new markers may help improve the OS that participates in the progression of the disease.
Collapse
Affiliation(s)
- Elizabeth Caussé
- Biochemistry Laboratory, Rangueil University Hospital, Toulouse, France
| | - Pauline Fournier
- Department of Cardiology, Rangueil University Hospital, Toulouse, France
| | - Jérome Roncalli
- Department of Cardiology, Rangueil University Hospital, Toulouse, France
- INSERM UMR 1048, Toulouse, France
| | - Robert Salvayre
- Biochemistry Laboratory, Rangueil University Hospital, Toulouse, France
- INSERM UMR 1048, Toulouse, France
| | - Michel Galinier
- Department of Cardiology, Rangueil University Hospital, Toulouse, France
- INSERM UMR 1048, Toulouse, France
| |
Collapse
|
11
|
Silva-Palacios A, Königsberg M, Zazueta C. Nrf2 signaling and redox homeostasis in the aging heart: A potential target to prevent cardiovascular diseases? Ageing Res Rev 2016; 26:81-95. [PMID: 26732035 DOI: 10.1016/j.arr.2015.12.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 12/09/2015] [Accepted: 12/21/2015] [Indexed: 10/22/2022]
Abstract
Aging process is often accompanied with a high incidence of cardiovascular diseases (CVD) due to the synergistic effects of age-related changes in heart morphology/function and prolonged exposure to injurious effects of CVD risk factors. Oxidative stress, considered a hallmark of aging, is also an important feature in pathologies that predispose to CVD development, like hypertension, diabetes and obesity. Approaches directed to prevent the occurrence of CVD during aging have been explored both in experimental models and in controlled clinical trials, in order to improve health span, reduce hospitalizations and increase life quality during elderly. In this review we discuss oxidative stress role as a main risk factor that relates CVD with aging. As well as interventions that aim to reduce oxidative stress by supplementing with exogenous antioxidants. In particular, strategies of improving the endogenous antioxidant defenses through activating the nuclear factor related-2 factor (Nrf2) pathway; one of the best studied molecules in cellular redox homeostasis and a master regulator of the antioxidant and phase II detoxification response.
Collapse
|
12
|
Raghban A, Kirsop J, Tang WHW. Prevention of Heart Failure in Patients with Chronic Kidney Disease. CURRENT CARDIOVASCULAR RISK REPORTS 2015; 9:428. [PMID: 38993263 PMCID: PMC11238633 DOI: 10.1007/s12170-014-0428-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Patients with chronic kidney disease (CKD) have heightened risk of developing heart failure (HF), yet few clinical studies have directly investigated the pathophysiologic underpinnings or therapeutic strategies to prevent HF. A wide range of clinically available cardiac and renal biomarkers can identify at-risk individuals who would benefit from dietary and lifestyle modifications (exercise prescription, smoking cessation), as well as risk factor modification (blood pressure, glucose, and lipid control). Angiotensin-converting enzyme inhibitors and angiotensin receptor blockers have the most consistent data for risk reduction, while other standard HF drugs such as beta-blockers and mineralocorticoid receptor antagonists have promising findings but no large-scale clinical trial evidence for their routine use to prevent the development and progression of HF in this vulnerable population.
Collapse
Affiliation(s)
- Amr Raghban
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk J3-4, Cleveland, OH 44195, USA
| | - Jennifer Kirsop
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk J3-4, Cleveland, OH 44195, USA
| | - W H Wilson Tang
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk J3-4, Cleveland, OH 44195, USA
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, Desk J3-4, Cleveland, OH 44195, USA
| |
Collapse
|
13
|
Abstract
The electronic structure of ground state oxygen, which is essential for the life of all aerobic organisms, makes it potentially dangerous for those organisms. Atmospheric oxygen contains two unpaired electrons with parallel spin states, which predisposes it to reduction by a univalent pathway. As a consequence, normal aerobic metabolism generates dangerous reactive intermediates of the reduction of O2. These include superoxide radical (O2*-), hydrogen peroxide (H2O2), and hydroxyl radical (HO*). These reactive oxygen species and others that they can engender can damage all cellular macromolecules and unless opposed by cellular defenses, would make aerobic life impossible. Such defenses include superoxide dismutases, catalases, and peroxidases, enzymes that decrease the concentration of the reactive oxygen species that are their substrates, and others that repair or recycle oxidatively damaged macromolecules. Any factor that stimulates reactive oxygen species production or suppresses the antioxidant systems would inevitably cause cell damage. The role of such oxidative damage in various diseases is well documented. In vivo detection of O2- and other reactive oxygen species is however hampered by the lack of easy, specific, and sensitive analytical methods. Potential artifacts and limitations of the most common detection methods currently in use are briefly discussed.
Collapse
Affiliation(s)
- Irwin Fridovich
- *Irwin Fridovich, Department of Biochemistry, Duke University
Medical Center, Durham, NC 27710 (USA), Tel. +1 919 684 5122, E-Mail
| |
Collapse
|
14
|
Yin L, Song J, Board PG, Yu Y, Han X, Wei J. Characterization of selenium-containing glutathione transferase zeta1-1 with high GPX activity prepared in eukaryotic cells. J Mol Recognit 2012; 26:38-45. [DOI: 10.1002/jmr.2241] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2012] [Revised: 09/08/2012] [Accepted: 09/12/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Li Yin
- College of Pharmaceutical Science; Jilin University; 1266 Fujin Road; Changchun; 130021; China
| | - Jian Song
- College of Electronic Science and Engineering; Jilin University; 2699 Qianjin Street; Changchun; 130000; China
| | - Philip G. Board
- Molecular Genetics Group, Division of Molecular Medicine, John Curtin School of Medical Research; Australian National University; GPO Box 334; Canberra; 2601; Australia
| | - Yang Yu
- College of Pharmaceutical Science; Jilin University; 1266 Fujin Road; Changchun; 130021; China
| | - Xiao Han
- College of Pharmaceutical Science; Jilin University; 1266 Fujin Road; Changchun; 130021; China
| | | |
Collapse
|