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Coskun E, Singh N, Scanlan LD, Jaruga P, Doak SH, Dizdaroglu M, Nelson BC. Inhibition of human APE1 and MTH1 DNA repair proteins by dextran-coated γ-Fe 2O 3 ultrasmall superparamagnetic iron oxide nanoparticles. Nanomedicine (Lond) 2022; 17:2011-2021. [PMID: 36853189 PMCID: PMC10031551 DOI: 10.2217/nnm-2022-0204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023] Open
Abstract
Aim: To quantitatively evaluate the inhibition of human DNA repair proteins APE1 and MTH1 by dextran-coated γ-Fe2O3 ultrasmall superparamagnetic iron oxide nanoparticles (dUSPIONs). Materials & methods: Liquid chromatography-tandem mass spectrometry with isotope-dilution was used to measure the expression levels of APE1 and MTH1 in MCL-5 cells exposed to increasing doses of dUSPIONs. The expression levels of APE1 and MTH1 were measured in cytoplasmic and nuclear fractions of cell extracts. Results: APE1 and MTH1 expression was significantly inhibited in both cell fractions at the highest dUSPION dose. The expression of MTH1 was linearly inhibited across the full dUSPION dose range in both fractions. Conclusion: These findings warrant further studies to characterize the capacity of dUSPIONs to inhibit other DNA repair proteins in vitro and in vivo.
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Affiliation(s)
- Erdem Coskun
- Institute for Bioscience & Biotechnology Research, University of Maryland, Rockville, MD 20850, USA
| | - Neenu Singh
- Leicester School of Allied Health Sciences, Faculty of Health & Life Sciences, De Montfort University, The Gateway, Leicester, LE1 9BH, UK
| | - Leona D Scanlan
- California Environmental Protection Agency, Office of Environmental Health Hazard Assessment, 1001 I Street, Sacramento, CA 95814, USA
| | - Pawel Jaruga
- Biomolecular Measurement Division, National Institute of Standards & Technology, Gaithersburg, MD 20899, USA
| | - Shareen H Doak
- Institute of Life Science, Center for NanoHealth, Swansea University Medical School, Wales, SA2 8PP, UK
| | - Miral Dizdaroglu
- Biomolecular Measurement Division, National Institute of Standards & Technology, Gaithersburg, MD 20899, USA
| | - Bryant C Nelson
- Biosystems & Biomaterials Division, National Institute of Standards & Technology, Gaithersburg, MD 20899, USA
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2
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Miner KM, Jamenis AS, Bhatia TN, Clark RN, Rajasundaram D, Sauvaigo S, Mason DM, Posimo JM, Abraham N, DeMarco BA, Hu X, Stetler RA, Chen J, Sanders LH, Luk KC, Leak RK. α-synucleinopathy exerts sex-dimorphic effects on the multipurpose DNA repair/redox protein APE1 in mice and humans. Prog Neurobiol 2022; 216:102307. [PMID: 35710046 PMCID: PMC9514220 DOI: 10.1016/j.pneurobio.2022.102307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Revised: 04/05/2022] [Accepted: 06/10/2022] [Indexed: 11/16/2022]
Abstract
Lewy body disorders are characterized by oxidative damage to DNA and inclusions rich in aggregated forms of α-synuclein. Among other roles, apurinic/apyrimidinic endonuclease 1 (APE1) repairs oxidative DNA damage, and APE1 polymorphisms have been linked to cases of Lewy body disorders. However, the link between APE1 and α-synuclein is unexplored. We report that knockdown or inhibition of APE1 amplified inclusion formation in primary hippocampal cultures challenged with preformed α-synuclein fibrils. Fibril infusions into the mouse olfactory bulb/anterior olfactory nucleus (OB/AON) elicited a modest decrease in APE1 expression in the brains of male mice but an increase in females. Similarly, men with Lewy body disorders displayed lower APE1 expression in the OB and amygdala compared to women. Preformed fibril infusions of the mouse OB/AON induced more robust base excision repair of DNA lesions in females than males. No fibril-mediated loss of APE1 expression was observed in male mice when the antioxidant N-acetylcysteine was added to their diet. These findings reveal a potential sex-biased link between α-synucleinopathy and APE1 in mice and humans. Further studies are warranted to determine how this multifunctional protein modifies α-synuclein inclusions and, conversely, how α-synucleinopathy and biological sex interact to modify APE1.
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Affiliation(s)
- Kristin M Miner
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Anuj S Jamenis
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Tarun N Bhatia
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Rachel N Clark
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Dhivyaa Rajasundaram
- Department of Pediatrics, Rangos Research Center, UPMC Children's Hospital of Pittsburgh, PA 15224, USA
| | | | - Daniel M Mason
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Jessica M Posimo
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Nevil Abraham
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Brett A DeMarco
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA
| | - Xiaoming Hu
- Department of Neurology, University of Pittsburgh, PA 15213, USA
| | - R Anne Stetler
- Department of Neurology, University of Pittsburgh, PA 15213, USA
| | - Jun Chen
- Department of Neurology, University of Pittsburgh, PA 15213, USA
| | - Laurie H Sanders
- Department of Neurology, Duke University School of Medicine, Durham, NC 27710, USA
| | - Kelvin C Luk
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19147, USA
| | - Rehana K Leak
- Graduate School of Pharmaceutical Sciences, Duquesne University, Pittsburgh, PA 15282, USA.
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Bustamante-Barrientos FA, Méndez-Ruette M, Ortloff A, Luz-Crawford P, Rivera FJ, Figueroa CD, Molina L, Bátiz LF. The Impact of Estrogen and Estrogen-Like Molecules in Neurogenesis and Neurodegeneration: Beneficial or Harmful? Front Cell Neurosci 2021; 15:636176. [PMID: 33762910 PMCID: PMC7984366 DOI: 10.3389/fncel.2021.636176] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 02/10/2021] [Indexed: 12/19/2022] Open
Abstract
Estrogens and estrogen-like molecules can modify the biology of several cell types. Estrogen receptors alpha (ERα) and beta (ERβ) belong to the so-called classical family of estrogen receptors, while the G protein-coupled estrogen receptor 1 (GPER-1) represents a non-classical estrogen receptor mainly located in the plasma membrane. As estrogen receptors are ubiquitously distributed, they can modulate cell proliferation, differentiation, and survival in several tissues and organs, including the central nervous system (CNS). Estrogens can exert neuroprotective roles by acting as anti-oxidants, promoting DNA repair, inducing the expression of growth factors, and modulating cerebral blood flow. Additionally, estrogen-dependent signaling pathways are involved in regulating the balance between proliferation and differentiation of neural stem/progenitor cells (NSPCs), thus influencing neurogenic processes. Since several estrogen-based therapies are used nowadays and estrogen-like molecules, including phytoestrogens and xenoestrogens, are omnipresent in our environment, estrogen-dependent changes in cell biology and tissue homeostasis have gained attention in human health and disease. This article provides a comprehensive literature review on the current knowledge of estrogen and estrogen-like molecules and their impact on cell survival and neurodegeneration, as well as their role in NSPCs proliferation/differentiation balance and neurogenesis.
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Affiliation(s)
- Felipe A Bustamante-Barrientos
- Immunology Program, Centro de Investigación e Innovación Biomédica (CiiB), Universidad de los Andes, Santiago, Chile.,Cells for Cells, Santiago, Chile
| | - Maxs Méndez-Ruette
- Neuroscience Program, Centro de Investigación e Innovación Biomédica (CiiB), Universidad de los Andes, Santiago, Chile
| | - Alexander Ortloff
- Departamento de Ciencias Veterinarias y Salud Pública, Facultad de Recursos Naturales, Universidad Católica de Temuco, Temuco, Chile
| | - Patricia Luz-Crawford
- Immunology Program, Centro de Investigación e Innovación Biomédica (CiiB), Universidad de los Andes, Santiago, Chile.,Facultad de Medicina, School of Medicine, Universidad de los Andes, Santiago, Chile
| | - Francisco J Rivera
- Laboratory of Stem Cells and Neuroregeneration, Faculty of Medicine, Institute of Anatomy, Histology and Pathology, Universidad Austral de Chile, Valdivia, Chile.,Center for Interdisciplinary Studies on the Nervous System (CISNe), Universidad Austral de Chile, Valdivia, Chile.,Institute of Molecular Regenerative Medicine, Paracelsus Medical University, Salzburg, Austria.,Spinal Cord Injury and Tissue Regeneration Center Salzburg (SCI-TReCS), Paracelsus Medical University, Salzburg, Austria
| | - Carlos D Figueroa
- Center for Interdisciplinary Studies on the Nervous System (CISNe), Universidad Austral de Chile, Valdivia, Chile.,Laboratory of Cellular Pathology, Institute of Anatomy, Histology and Pathology, Facultad de Medicina, Universidad Austral de Chile, Valdivia, Chile
| | - Luis Molina
- Facultad de Medicina y Ciencia, Universidad San Sebastián, Puerto Montt, Chile
| | - Luis Federico Bátiz
- Neuroscience Program, Centro de Investigación e Innovación Biomédica (CiiB), Universidad de los Andes, Santiago, Chile.,Facultad de Medicina, School of Medicine, Universidad de los Andes, Santiago, Chile
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4
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Azcoitia I, Barreto GE, Garcia-Segura LM. Molecular mechanisms and cellular events involved in the neuroprotective actions of estradiol. Analysis of sex differences. Front Neuroendocrinol 2019; 55:100787. [PMID: 31513774 DOI: 10.1016/j.yfrne.2019.100787] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 08/27/2019] [Accepted: 09/07/2019] [Indexed: 12/12/2022]
Abstract
Estradiol, either from peripheral or central origin, activates multiple molecular neuroprotective and neuroreparative responses that, being mediated by estrogen receptors or by estrogen receptor independent mechanisms, are initiated at the membrane, the cytoplasm or the cell nucleus of neural cells. Estrogen-dependent signaling regulates a variety of cellular events, such as intracellular Ca2+ levels, mitochondrial respiratory capacity, ATP production, mitochondrial membrane potential, autophagy and apoptosis. In turn, these molecular and cellular actions of estradiol are integrated by neurons and non-neuronal cells to generate different tissue protective responses, decreasing blood-brain barrier permeability, oxidative stress, neuroinflammation and excitotoxicity and promoting synaptic plasticity, axonal growth, neurogenesis, remyelination and neuroregeneration. Recent findings indicate that the neuroprotective and neuroreparative actions of estradiol are different in males and females and further research is necessary to fully elucidate the causes for this sex difference.
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Affiliation(s)
- Iñigo Azcoitia
- Department of Cell Biology, Faculty of Biology, Universidad Complutense de Madrid, 28040 Madrid, Spain; Centro de Investigación Biomédica en Red Fragilidad y Envejecimiento Saludables (CIBERFES), Instituto de Salud Carlos III, Avenida Monforte de Lemos, 3-5, 28029 Madrid, Spain.
| | - George E Barreto
- Department of Biological Sciences, School of Natural Sciences, University of Limerick, Limerick, Ireland.
| | - Luis M Garcia-Segura
- Centro de Investigación Biomédica en Red Fragilidad y Envejecimiento Saludables (CIBERFES), Instituto de Salud Carlos III, Avenida Monforte de Lemos, 3-5, 28029 Madrid, Spain; Instituto Cajal, CSIC, Avenida Doctor Arce 37, 28002 Madrid, Spain.
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5
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Chaychi S, Polosa A, Chemtob S, Lachapelle P. Evaluating the neuroprotective effect of 17β-estradiol in rodent models of oxidative retinopathies. Doc Ophthalmol 2018; 137:151-168. [PMID: 30368631 DOI: 10.1007/s10633-018-9658-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 10/15/2018] [Indexed: 12/14/2022]
Abstract
PURPOSE To determine the neuroprotective effect of estrogen on the structure and function of the retina exposed to an oxidative stress. METHODS Male Sprague-Dawley rat pups were exposed to either hyperoxia (O2E: from P8 to P14) or bright light (LE: from P14 to P28) with or without 17 β-estradiol (βE2) treatment. Retinal structure (histology) and function (ERG) were assessed at selected time points. RESULTS In the O2E model, βE2 injections caused a significant reduction of the ERG and a significantly thinner OPL compared to untreated oxygen-exposed group (O2-exposed) rats. In contrast, in the LE model βE2, treatment was beneficial to the retinal structure (thicker ONL) and function (better preserved ERG amplitudes) compared to untreated light-exposed group (light-exposed rats). CONCLUSION Our results show that in conditions where the primary target of the oxidative stress is the outer retina (i.e., the photoreceptors) estrogen can protect the retina, while in situations where the inner retina (or retinal vasculature) is the main site of oxidative damage, estrogen may potentiate the detrimental effect of oxidative stress on the retina.
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Affiliation(s)
- Samaneh Chaychi
- Departments of Ophthalmology and Neurology-Neurosurgery, Faculty of Medicine, McGill University and Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Glen Site, Block E, Room EM03238, Montréal, QC, H4A 3J1, Canada
| | - Anna Polosa
- Departments of Ophthalmology and Neurology-Neurosurgery, Faculty of Medicine, McGill University and Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Glen Site, Block E, Room EM03238, Montréal, QC, H4A 3J1, Canada
| | - Sylvain Chemtob
- Departments of Pediatrics, Ophthalmology, and Pharmacology, Centre Hospitalier Universitaire Ste-Justine Research Center, Montréal, QC, Canada
| | - Pierre Lachapelle
- Departments of Ophthalmology and Neurology-Neurosurgery, Faculty of Medicine, McGill University and Research Institute of the McGill University Health Centre, 1001 Decarie Boulevard, Glen Site, Block E, Room EM03238, Montréal, QC, H4A 3J1, Canada.
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6
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Zaky A, Bassiouny A, Farghaly M, El-Sabaa BM. A Combination of Resveratrol and Curcumin is Effective Against Aluminum Chloride-Induced Neuroinflammation in Rats. J Alzheimers Dis 2018; 60:S221-S235. [PMID: 28222524 DOI: 10.3233/jad-161115] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Experimental studies have demonstrated that aluminum is an environmental toxin that induces neuroinflammation and the development of Alzheimer's disease. OBJECTIVE In this report, we investigated the beneficial effect of a combination of resveratrol and curcumin to reduce aluminum-induced neuroinflammation. METHOD We employed both an in vivo model of aluminum-induced neuroinflammation and an in vitro aluminum stimulated cultured PC-12 cells. Neuroinflammation in rats was assessed by measuring the expression of β-secretase, amyloid-β protein precursor, and γ-subunits (PS-1 and PS-2), along with the inflammatory COX-2, Il-1β, Il-1α, and TNF-α. Furthermore, we measured the expression profiles of neuro-protective Apurinic/apyrimidinic endonuclease 1 (APE1) protein and let-7c microRNA. In parallel, PC-12 cells were treated with 0.5 mM aluminum to induce a neuroinflammation-like state. In addition, curcumin effect, as a selective COX-2 expression inhibitor, was detected in a time course manner. RESULTS An overall significant attenuation of the inflammatory markers, as well as a decrease in the amyloidogenic mediators, was observed in resveratrol-curcumin treated rats. The therapeutic effect was also confirmed by transmission electron microscopic analysis of the brain cortexes. APE1 was significantly induced by resveratrol-curcumin combination. Both in vivo and in vitro studies indicated that Let-7c expression is significantly reduced after aluminum stimulation, an effect that was partially suppressed by co-addition of either resveratrol or curcumin and totally restored to the normal level by their combination. CONCLUSIONS The present study clearly indicates the synergistic and therapeutic effect of a resveratrol-curcumin combination. We also show that both compounds exert beneficial effect either cooperatively or through differential molecular mechanisms in counteracting aluminum-induced neuroinflammation.
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Affiliation(s)
- Amira Zaky
- Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Ahmad Bassiouny
- Department of Biochemistry, Faculty of Science, Alexandria University, Alexandria, Egypt
| | - Mahitab Farghaly
- Department of Environmental Research at National Center for Social & Criminological Research, Giza, Egypt
| | - Bassma M El-Sabaa
- Department of Pathology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
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7
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Erzin G, Kotan VO, Topçuoğlu C, Özkaya G, Erel Ö, Yüksel RN, Ürer E, Aydemir MÇ, Göka E. Thiol/disulphide homeostasis in bipolar disorder. Psychiatry Res 2018; 261:237-242. [PMID: 29329041 DOI: 10.1016/j.psychres.2017.12.062] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 10/31/2017] [Accepted: 12/30/2017] [Indexed: 10/18/2022]
Abstract
Bipolar disorder (BD) patients have increased oxidative stress, which can disturb thiol/disulphide homeostasis, causing disulphide formation. The aim of the study is to investigate dynamic thiol/disulphide (SH/SS) homeostasis in BD patients, which is a novel evaluation method of oxidative status. Ninety-four BD patients (50 in the manic episode and 44 in remission) and 44 healthy controls were included in the study. Blood serum native thiol (SH) and total thiol (ToSH) concentrations were measured in a paired test. The half value of the difference between native thiol and total thiol concentrations was calculated as the disulphide (SS) bond amount. Serum native thiol levels of the mania group were found to be lower than the remission and the control groups. There was a significant difference between the remission group and the control group in terms of native thiol. Serum total thiol level was lower in mania group than the control group. Detection of oxidative molecules for BD could be helpful, especially in treatment, follow-up periods and reducing morbidity. The results of our study besides the data available in the literature support that thiol and disulphide levels are useful markers for BD and promising therapeutic targets in terms of future pharmacological modulation.
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Affiliation(s)
- Gamze Erzin
- Ankara Numune Training and Research Hospital, Psychiatry Department, Ankara, Turkey.
| | - Vahap Ozan Kotan
- Ankara Numune Training and Research Hospital, Psychiatry Department, Ankara, Turkey.
| | - Canan Topçuoğlu
- Ankara Numune Training and Research Hospital, Biochemistry Department, Ankara, Turkey.
| | - Güven Özkaya
- Uludağ University, Faculty of Medicine, Biostatistics Department, Bursa, Turkey.
| | - Özcan Erel
- Yıldırım Beyazıt University, Biochemistry Department, Ankara, Turkey.
| | - Rabia Nazik Yüksel
- Ankara Numune Training and Research Hospital, Psychiatry Department, Ankara, Turkey.
| | - Emre Ürer
- Ankara University, School of Medicine, Child and Adolescent Psychiatry, Ankara, Turkey.
| | | | - Erol Göka
- Ankara Numune Training and Research Hospital, Psychiatry Department, Ankara, Turkey.
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8
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Zárate S, Stevnsner T, Gredilla R. Role of Estrogen and Other Sex Hormones in Brain Aging. Neuroprotection and DNA Repair. Front Aging Neurosci 2018. [PMID: 29311911 DOI: 10.3389/fnagi.2017.00430/xml/nlm] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023] Open
Abstract
Aging is an inevitable biological process characterized by a progressive decline in physiological function and increased susceptibility to disease. The detrimental effects of aging are observed in all tissues, the brain being the most important one due to its main role in the homeostasis of the organism. As our knowledge about the underlying mechanisms of brain aging increases, potential approaches to preserve brain function rise significantly. Accumulating evidence suggests that loss of genomic maintenance may contribute to aging, especially in the central nervous system (CNS) owing to its low DNA repair capacity. Sex hormones, particularly estrogens, possess potent antioxidant properties and play important roles in maintaining normal reproductive and non-reproductive functions. They exert neuroprotective actions and their loss during aging and natural or surgical menopause is associated with mitochondrial dysfunction, neuroinflammation, synaptic decline, cognitive impairment and increased risk of age-related disorders. Moreover, loss of sex hormones has been suggested to promote an accelerated aging phenotype eventually leading to the development of brain hypometabolism, a feature often observed in menopausal women and prodromal Alzheimer's disease (AD). Although data on the relation between sex hormones and DNA repair mechanisms in the brain is still limited, various investigations have linked sex hormone levels with different DNA repair enzymes. Here, we review estrogen anti-aging and neuroprotective mechanisms, which are currently an area of intense study, together with the effect they may have on the DNA repair capacity in the brain.
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Affiliation(s)
- Sandra Zárate
- Instituto de Investigaciones Biomédicas (INBIOMED, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina.,Departamento de Histología, Embriología, Biología Celular y Genética, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Tinna Stevnsner
- Danish Center for Molecular Gerontology and Danish Aging Research Center, Department of Molecular Biology and Genetics, University of Aarhus, Aarhus, Denmark
| | - Ricardo Gredilla
- Department of Physiology, Faculty of Medicine, Complutense University, Madrid, Spain
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9
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Zárate S, Stevnsner T, Gredilla R. Role of Estrogen and Other Sex Hormones in Brain Aging. Neuroprotection and DNA Repair. Front Aging Neurosci 2017; 9:430. [PMID: 29311911 PMCID: PMC5743731 DOI: 10.3389/fnagi.2017.00430] [Citation(s) in RCA: 159] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 12/14/2017] [Indexed: 12/13/2022] Open
Abstract
Aging is an inevitable biological process characterized by a progressive decline in physiological function and increased susceptibility to disease. The detrimental effects of aging are observed in all tissues, the brain being the most important one due to its main role in the homeostasis of the organism. As our knowledge about the underlying mechanisms of brain aging increases, potential approaches to preserve brain function rise significantly. Accumulating evidence suggests that loss of genomic maintenance may contribute to aging, especially in the central nervous system (CNS) owing to its low DNA repair capacity. Sex hormones, particularly estrogens, possess potent antioxidant properties and play important roles in maintaining normal reproductive and non-reproductive functions. They exert neuroprotective actions and their loss during aging and natural or surgical menopause is associated with mitochondrial dysfunction, neuroinflammation, synaptic decline, cognitive impairment and increased risk of age-related disorders. Moreover, loss of sex hormones has been suggested to promote an accelerated aging phenotype eventually leading to the development of brain hypometabolism, a feature often observed in menopausal women and prodromal Alzheimer's disease (AD). Although data on the relation between sex hormones and DNA repair mechanisms in the brain is still limited, various investigations have linked sex hormone levels with different DNA repair enzymes. Here, we review estrogen anti-aging and neuroprotective mechanisms, which are currently an area of intense study, together with the effect they may have on the DNA repair capacity in the brain.
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Affiliation(s)
- Sandra Zárate
- Instituto de Investigaciones Biomédicas (INBIOMED, UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
- Departamento de Histología, Embriología, Biología Celular y Genética, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Tinna Stevnsner
- Danish Center for Molecular Gerontology and Danish Aging Research Center, Department of Molecular Biology and Genetics, University of Aarhus, Aarhus, Denmark
| | - Ricardo Gredilla
- Department of Physiology, Faculty of Medicine, Complutense University, Madrid, Spain
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10
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Jia JY, Tan ZG, Liu M, Jiang YG. Apurinic/apyrimidinic endonuclease 1 (APE1) contributes to resveratrol‑induced neuroprotection against oxygen‑glucose deprivation and re‑oxygenation injury in HT22 cells: Involvement in reducing oxidative DNA damage. Mol Med Rep 2017; 16:9786-9794. [PMID: 29039534 DOI: 10.3892/mmr.2017.7799] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 09/19/2017] [Indexed: 11/06/2022] Open
Abstract
Resveratrol, a naturally occurring polyphenolic compound, exhibits a neuroprotective role in models of central nervous system diseases, including cerebral ischemia/reperfusion injury. Apurinic/apyrimidinic endonuclease 1 (APE1) is a multifunctional enzyme that contributes to base excision repair of oxidative DNA damage and redox activation of transcription factors, associated with neuronal survival against hypoxic‑ischemic injury. It was hypothesized that resveratrol protects HT22 cells against oxygen‑glucose deprivation and re‑oxygenation (OGD/R)‑induced injuries through upregulation of APE1. It was demonstrated that resveratrol pretreatment significantly increased the viability of HT22 cells and decreased the release of lactate dehydrogenase (LDH), accompanied by the upregulation of APE1 mRNA, and protein levels, as well as the activity of APE1 under OGD/R conditions. In addition, resveratrol reversed OGD/R‑induced oxidative DNA damage as evidenced by the decreases in the levels of 8‑hydroxy‑2'‑deoxyguanosine and APE sites. However, APE1 knockdown using short hairpin RNA sequence targeting APE1 abolished resveratrol‑elicited beneficent effects against OGD/R‑induced cytotoxicity and oxidative stress. This was indicated by decreased cell viability, superoxide dismutase activity and glutathione levels, and increased LDH release and reactive oxygen species levels. The results of the present study indicate that APE1 contributes to the protective effects of resveratrol against neonatal hypoxic‑ischemic brain injuries, and suggest that DNA repair enzymes, including APE1, may be a unique strategy for neuroprotection against this disease.
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Affiliation(s)
- Jiao-Ying Jia
- Department of Neurosurgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China
| | - Zhi-Gang Tan
- Department of Neurosurgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China
| | - Min Liu
- Department of Neurosurgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China
| | - Yu-Gang Jiang
- Department of Neurosurgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China
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11
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Lackner N, Bengesser SA, Birner A, Painold A, Fellendorf FT, Platzer M, Reininghaus B, Weiss EM, Mangge H, McIntyre RS, Fuchs D, Kapfhammer HP, Wallner-Liebmann SJ, Reininghaus EZ. Abdominal obesity is associated with impaired cognitive function in euthymic bipolar individuals. World J Biol Psychiatry 2016; 17:535-46. [PMID: 26068130 DOI: 10.3109/15622975.2015.1046917] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
OBJECTIVES Overweight/obesity has been implicated to play a role in cognitive deficits in bipolar disorder (BD). This study aims to identify the relationship between body fat distribution and different domains of cognition in BD during euthymia. METHODS A sample of 100 euthymic individuals with BD was measured with a cognitive test battery (i.e., Trail Making Test-A-B/TM-A/B, d2 Test of Attention, Stroop test, California Verbal Learning Test/CVLT) and an anthropometric measures set (body mass index, waist circumference, hip circumference, waist-to-hip-ratio, waist-to-height-ratio, and lipometry). Patient data were compared with a healthy control group (n = 64). RESULTS Results show that overweight patients with BD exhibit lower performance in the TMT-A/B as well as in the free recall performance of the CVLT compared to normal-weight patients with BD and controls. In bipolar individuals, (abdominal) obesity was significantly associated with a poor cognitive performance. In bipolar females, associations with measures of verbal learning and memory were found; in bipolar males, associations with poor performance in the TMT-A/B and in the Stroop interference task were demonstrated. In controls, no associations were found. CONCLUSIONS There are several possible pathways moderating the association between obesity and cognition in BD. Anthropometric and lipometry data underline the substantial mediating impact of body fat distribution on cognition in BD.
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Affiliation(s)
- N Lackner
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - S A Bengesser
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - A Birner
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - A Painold
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - F T Fellendorf
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - M Platzer
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - B Reininghaus
- b Therapiezentrum Justuspark, Versicherungsanstalt öffentlich Bediensteter , Austria
| | - E M Weiss
- c Department of Biological Psychology , Karl-Franzens University Graz , Graz , Austria
| | - H Mangge
- d Research Unit on Lifestyle and Inflammation-associated Risk Biomarkers, Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University Graz , Graz , Austria.,e BioTechMed-Graz , Graz , Austria
| | - R S McIntyre
- f Mood Disorders Psychopharmacology Unit, University of Toronto , Toronto , Canada
| | - D Fuchs
- g Division of Biological Chemistry, Medical University of Innsbruck , Innsbruck , Austria
| | - H P Kapfhammer
- a Department of Psychiatry , Medical University Graz , Graz , Austria
| | - S J Wallner-Liebmann
- h Department of Pathophysiology and Immunology , Medical University Graz , Graz , Austria
| | - E Z Reininghaus
- a Department of Psychiatry , Medical University Graz , Graz , Austria
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12
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Borkum JM. Migraine Triggers and Oxidative Stress: A Narrative Review and Synthesis. Headache 2015; 56:12-35. [PMID: 26639834 DOI: 10.1111/head.12725] [Citation(s) in RCA: 151] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/03/2015] [Indexed: 01/01/2023]
Abstract
BACKGROUND Blau theorized that migraine triggers are exposures that in higher amounts would damage the brain. The recent discovery that the TRPA1 ion channel transduces oxidative stress and triggers neurogenic inflammation suggests that oxidative stress may be the common denominator underlying migraine triggers. OBJECTIVE The aim of this review is to present and discuss the available literature on the capacity of common migraine triggers to generate oxidative stress in the brain. METHODS A Medline search was conducted crossing the terms "oxidative stress" and "brain" with "alcohol," "dehydration," "water deprivation," "monosodium glutamate," "aspartame," "tyramine," "phenylethylamine," "dietary nitrates," "nitrosamines," "noise," "weather," "air pollutants," "hypoglycemia," "hypoxia," "infection," "estrogen," "circadian," "sleep deprivation," "information processing," "psychosocial stress," or "nitroglycerin and tolerance." "Flavonoids" was crossed with "prooxidant." The reference lists of the resulting articles were examined for further relevant studies. The focus was on empirical studies, in vitro and of animals, of individual triggers, indicating whether and/or by what mechanism they can generate oxidative stress. RESULTS In all cases except pericranial pain, common migraine triggers are capable of generating oxidative stress. Depending on the trigger, mechanisms include a high rate of energy production by the mitochondria, toxicity or altered membrane properties of the mitochondria, calcium overload and excitotoxicity, neuroinflammation and activation of microglia, and activation of neuronal nicotinamide adenine dinucleotide phosphate (NADPH) oxidase. For some triggers, oxidants also arise as a byproduct of monoamine oxidase or cytochrome P450 processing, or from uncoupling of nitric oxide synthase. CONCLUSIONS Oxidative stress is a plausible unifying principle behind the types of migraine triggers encountered in clinical practice. The possible implications for prevention and for understanding the nature of the migraine attack are discussed.
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Affiliation(s)
- Jonathan M Borkum
- Department of Psychology, University of Maine, Orono, ME, USA.,Health Psych Maine, Waterville, ME, USA
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13
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Coskun E, Jaruga P, Reddy PT, Dizdaroglu M. Extreme Expression of DNA Repair Protein Apurinic/Apyrimidinic Endonuclease 1 (APE1) in Human Breast Cancer As Measured by Liquid Chromatography and Isotope Dilution Tandem Mass Spectrometry. Biochemistry 2015; 54:5787-90. [PMID: 26359670 DOI: 10.1021/acs.biochem.5b00928] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Apurinic/apyrimidinic endonuclease 1 (APE1) is a DNA repair protein and plays other important roles. Increased levels of APE1 in cancer have been reported. However, available methods for measuring APE1 levels are indirect and not quantitative. We previously developed an approach using liquid chromatography and tandem mass spectrometry with isotope dilution to accurately measure APE1 levels. Here, we applied this methodology to measure APE1 levels in normal and cancerous human breast tissues. Extreme expression of APE1 in malignant tumors was observed, suggesting that breast cancer cells may require APE1 for survival. Accurate measurement of APE1 may be essential for the development of novel treatment strategies and APE1 inhibitors as anticancer drugs.
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Affiliation(s)
- Erdem Coskun
- Biomolecular Measurement Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States.,Department of Toxicology, Faculty of Pharmacy, Gazi University , Ankara, Turkey
| | - Pawel Jaruga
- Biomolecular Measurement Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
| | - Prasad T Reddy
- Biomolecular Measurement Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
| | - Miral Dizdaroglu
- Biomolecular Measurement Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, United States
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14
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Birner A, Seiler S, Lackner N, Bengesser SA, Queissner R, Fellendorf FT, Platzer M, Ropele S, Enzinger C, Schwingenschuh P, Mangge H, Pirpamer L, Deutschmann H, McIntyre RS, Kapfhammer HP, Reininghaus B, Reininghaus EZ. Cerebral White Matter Lesions and Affective Episodes Correlate in Male Individuals with Bipolar Disorder. PLoS One 2015; 10:e0135313. [PMID: 26252714 PMCID: PMC4529150 DOI: 10.1371/journal.pone.0135313] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 07/20/2015] [Indexed: 12/21/2022] Open
Abstract
Background Cerebral white matter lesions (WML) have been found in normal aging, vascular disease and several neuropsychiatric conditions. Correlations of WML with clinical parameters in BD have been described, but not with the number of affective episodes, illness duration, age of onset and Body Mass Index in a well characterized group of euthymic bipolar adults. Herein, we aimed to evaluate the associations between bipolar course of illness parameters and WML measured with volumetric analysis. Methods In a cross-sectional study 100 euthymic individuals with BD as well as 54 healthy controls (HC) were enrolled to undergo brain magnetic resonance imaging using 3T including a FLAIR sequence for volumetric assessment of WML-load using FSL-software. Additionally, clinical characteristics and psychometric measures including Structured Clinical Interview according to DSM-IV, Hamilton-Depression, Young Mania Rating Scale and Beck’s Depression Inventory were evaluated. Results Individuals with BD had significantly more (F = 3.968, p < .05) WML (Mdn = 3710mm3; IQR = 2961mm3) than HC (Mdn = 2185mm3; IQR = 1665mm3). BD men (Mdn = 4095mm3; IQR = 3295mm3) and BD women (Mdn = 3032mm3; IQR = 2816mm3) did not significantly differ as to the WML-load or the number and type of risk factors for WML. However, in men only, the number of manic/hypomanic episodes (r = 0.72; p < .001) as well as depressive episodes (r = 0.51; p < .001) correlated positively with WML-load. Conclusions WML-load strongly correlated with the number of manic episodes in male BD patients, suggesting that men might be more vulnerable to mania in the context of cerebral white matter changes.
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Affiliation(s)
- Armin Birner
- Department of Psychiatry, Medical University of Graz, Graz, Austria
| | - Stephan Seiler
- Department of Neurology, Medical University of Graz, Graz, Austria
- * E-mail:
| | - Nina Lackner
- Department of Psychiatry, Medical University of Graz, Graz, Austria
| | | | - Robert Queissner
- Department of Psychiatry, Medical University of Graz, Graz, Austria
| | | | - Martina Platzer
- Department of Psychiatry, Medical University of Graz, Graz, Austria
| | - Stefan Ropele
- Department of Neurology, Medical University of Graz, Graz, Austria
| | - Christian Enzinger
- Department of Neurology, Medical University of Graz, Graz, Austria
- Division of Neuroradiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Petra Schwingenschuh
- Department of Neurology, Medical University of Graz, Graz, Austria
- Division of Neuroradiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Harald Mangge
- Research Unit on Lifestyle and Inflammation-associated Risk Biomarkers, Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University Graz, Graz, Austria
| | - Lukas Pirpamer
- Department of Neurology, Medical University of Graz, Graz, Austria
| | - Hannes Deutschmann
- Division of Neuroradiology, Department of Radiology, Medical University of Graz, Graz, Austria
| | - Roger S. McIntyre
- Mood Disorders Psychopharmacology Unit at the University Health Network, University of Toronto, Toronto, Canada
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15
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Dietrich AK, Humphreys GI, Nardulli AM. Expression of estrogen receptor α in the mouse cerebral cortex. Mol Cell Endocrinol 2015; 406:19-26. [PMID: 25700604 PMCID: PMC4773199 DOI: 10.1016/j.mce.2015.02.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 02/11/2015] [Accepted: 02/12/2015] [Indexed: 12/15/2022]
Abstract
Although estrogen receptor alpha (ERα) and 17β-estradiol play critical roles in protecting the cerebral cortex from ischemia-induced damage, there has been some controversy about the expression of ERα in this region of the brain. We have examined ERα mRNA and protein levels in the cerebral cortices of female mice at postnatal days 5 and 17 and at 4, 13, and 18 months of age. We found that although ERα transcript levels declined from postnatal day 5 through 18 months of age, ERα protein levels remained stable. Importantly, expression of the E2-regulated progesterone receptor gene was sustained in younger and in older females suggesting that age-related changes in estrogen responsiveness in the cerebral cortex are not due to the absence of ERα protein.
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Affiliation(s)
- Alicia K Dietrich
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Gwendolyn I Humphreys
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Ann M Nardulli
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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16
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Habib P, Beyer C. Regulation of brain microglia by female gonadal steroids. J Steroid Biochem Mol Biol 2015; 146:3-14. [PMID: 24607811 DOI: 10.1016/j.jsbmb.2014.02.018] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 02/24/2014] [Indexed: 12/31/2022]
Abstract
Microglial cells are the primary mediators of the CNS immune defense system and crucial for shaping inflammatory responses. They represent a highly dynamic cell population which is constantly moving and surveying their environment. Acute brain damage causes a local attraction and activation of this immune cell type which involves neuron-to-glia and glia-to-glia interactions. The prevailing view attributes microglia a "negative" role such as defense and debris elimination. More topical studies also suggest a protective and "positive" regulatory function. Estrogens and progestins exert anti-inflammatory and neuroprotective effects in the CNS in acute and chronic brain diseases. Recent work revealed that microglial cells express subsets of classical and non-classical estrogen and progesterone receptors in a highly dynamic way. In this review article, we would like to stress the importance of microglia for the spreading of neural damage during hypoxia, their susceptibility to functional modulation by sex steroids, the potency of sex hormones to switch microglia from a pro-inflammatory M1 to neuroprotective M2 phenotype, and the regulation of pro- and anti-inflammatory properties including the inflammasome. We will further discuss the possibility that the neuroprotective action of sex steroids in the brain involves an early and direct modulation of local microglia cell function. This article is part of a Special Issue entitled 'Sex steroids and brain disorders'.
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Affiliation(s)
- Pardes Habib
- Institute of Neuroanatomy, RWTH Aachen University, 52074 Aachen, Germany
| | - Cordian Beyer
- Institute of Neuroanatomy, RWTH Aachen University, 52074 Aachen, Germany.
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17
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Bengesser SA, Lackner N, Birner A, Fellendorf FT, Platzer M, Mitteregger A, Unterweger R, Reininghaus B, Mangge H, Wallner-Liebmann SJ, Zelzer S, Fuchs D, McIntyre RS, Kapfhammer HP, Reininghaus EZ. Peripheral markers of oxidative stress and antioxidative defense in euthymia of bipolar disorder--Gender and obesity effects. J Affect Disord 2015; 172:367-74. [PMID: 25451439 DOI: 10.1016/j.jad.2014.10.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 08/20/2014] [Accepted: 10/07/2014] [Indexed: 10/24/2022]
Abstract
INTRODUCTION Oxidative and nitrosative stress are implicated in the pathogenesis of uni- and bipolar disorder. Herein we primarily sought to characterize markers of oxidative/nitrosative stress during euthymia in adults with bipolar disorder (BD). Oxidative markers were further evaluated in this BD sample in synopsis with excess overweight or obesity and/or comorbid metabolic syndrome (MetS). METHODS Peripheral markers of oxidative stress [i.e. thiobarbituric acid reactive substance, (TBARS), malondialdehyde (MDA), and carbonyl proteins] and antioxidant markers [e.g. total antioxidative capacity (TAC), superoxide dismutase (SOD), glutathione S-transferase (GST)] were obtained in a cohort of euthymic adults with BD (N=113) and compared to healthy controls (CG) (N=78). Additionally, anthropometric measures included the body mass index (BMI) [kg/m(2)], waist and hip circumference [cm], waist-to-hip-ratio (WHR), waist to height ratio (WtHR) as well as the IDF-defined MetS. RESULTS The major finding was a significantly decreased TAC in BD compared to the CG (p<0.01; BD: M 1.18, SD 0.47; CG: M 1.39, SD 0.49). MDA was significantly and TBARS by trend higher in the CG compared to the euthymic bipolar test persons (MDA: p<0.01, BD: M 0.70, SD 0.18; CG: M 0.81, SD 0.25; TBARS: p<0.1, BD: M 0.78, SD 0.28; CG: M 0.76, SD 0.30). The antioxidative enzyme GST was significantly elevated in both patients and controls (BD: M 298.24, SD 133.02; CG: M 307.27 SD 118.18). Subgroup analysis revealed that the CG with concurrent MetS and obesity had significantly elevated TAC when compared to CG without concurrent MetS (p<0.05, no MetS: M 1.33, SD 0.50; MetS: M 1.67, SD 0.32), as well as persons with BD with or without current MetS (no MetS: M 1.18, SD 0.44; MetS: M 1.15, SD 0.49). Significant correlations between GST and anthropometric variables were found in male study participants. Multivariate analysis indicated a significant gender effect concerning TBARS values in all patients and CG (p<0.01, females: M 0.73, SD 0.29; males: M 0.83, SD 0.28). CONCLUSION Euthymic bipolar adults exhibit peripheral evidence of a disturbed biosignature of oxidative stress and antioxidative defense. Male test persons showed significantly higher peripheral markers of oxidative stress than women- female sex may exert protective effects. Furthermore, the biosignature of oxidative stress obtained herein was more pronounced in males with concurrent metabolic disorders. Our results further extend knowledge by introducing the moderating influence of gender and obesity on oxidative stress and BD.
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Affiliation(s)
- S A Bengesser
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - N Lackner
- Medical University of Graz, Department of Psychiatry, Graz, Austria.
| | - A Birner
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - F T Fellendorf
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - M Platzer
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - A Mitteregger
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - R Unterweger
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - B Reininghaus
- Medical University of Graz, Department of Psychiatry, Graz, Austria; Therapiezentrum Justuspark, Linzer Straße 7, 4540 Bad Hall, Austria
| | - H Mangge
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Graz, Austria
| | | | - S Zelzer
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Graz, Austria
| | - D Fuchs
- Medical University of Innsbruck, Biocenter, Division of Biological Chemistry, Innsbruck, Austria
| | - R S McIntyre
- University of Toronto, Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, ON, Canada
| | - H P Kapfhammer
- Medical University of Graz, Department of Psychiatry, Graz, Austria
| | - E Z Reininghaus
- Medical University of Graz, Department of Psychiatry, Graz, Austria
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18
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Zhao XN, Usdin K. Gender and cell-type-specific effects of the transcription-coupled repair protein, ERCC6/CSB, on repeat expansion in a mouse model of the fragile X-related disorders. Hum Mutat 2014; 35:341-9. [PMID: 24352881 DOI: 10.1002/humu.22495] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Accepted: 12/10/2013] [Indexed: 01/21/2023]
Abstract
The repeat expansion diseases are human genetic disorders that arise from the expansion of a tandem-repeat tract. The Fragile X-related disorders are members of this disease group in which the repeat unit is CGG/CCG and is located in the 5′ untranslated region of the FMR1 gene. Affected individuals often show mosaicism with respect to repeat number resulting from both expansion and contraction of the repeat tract; however, the mechanism responsible for these changes in repeat number is unknown. The work from a variety of model systems suggests that transcription-coupled repair (TCR) may contribute to repeat instability in diseases resulting from CAG/CTG-repeat expansion. To test whether TCR could contribute to repeat instability in the Fragile X-related disorders, we tested the effect of mutations in Csb (Cockayne syndrome group B), a gene essential for TCR, in a knock-in mouse model of these disorders. We found that the loss of CSB affects expansions in a gender and cell-type-specific manner. Our data also show an unanticipated gender difference in instability even in Csb+/+ animals that may have implications for our understanding of the mechanism of repeat expansion in the FX mouse model and perhaps for humans as well.
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19
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Yuan L, Dietrich AK, Nardulli AM. 17β-Estradiol alters oxidative stress response protein expression and oxidative damage in the uterus. Mol Cell Endocrinol 2014; 382:218-226. [PMID: 24103313 PMCID: PMC3900311 DOI: 10.1016/j.mce.2013.09.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2013] [Revised: 09/16/2013] [Accepted: 09/18/2013] [Indexed: 11/19/2022]
Abstract
The steroid hormone 17β-estradiol (E2) has profound effects on the uterus. However, with the E2-induced increase in uterine cell proliferation and metabolism comes increased production of reactive oxygen species (ROS). We examined the expression of an interactive network of oxidative stress response proteins including thioredoxin (Trx), Cu/Zn superoxide dismutase (SOD1), apurinic endonuclease (Ape1), and protein disulfide isomerase (PDI). We demonstrated that treatment of ovariectomized C57BL/6J female mice with E2 increased the mRNA and protein levels of Trx, but decreased SOD1 and Ape1 mRNA and protein expression. In contrast, E2 treatment increased PDI protein levels but had no effect on PDI transcript levels. Interestingly, E2 treatment also increased two markers of cellular damage, lipid peroxidation and protein carbonylation. Our studies suggest that the decreased expression of SOD1 and Ape1 caused by E2 treatment may in the long term result in disruption of ROS regulation and play a role in endometrial carcinogenesis.
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Affiliation(s)
- Lisi Yuan
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States
| | - Alicia K Dietrich
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States
| | - Ann M Nardulli
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, United States.
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