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Karakaya E, Oleinik N, Edwards J, Tomberlin J, Barker RB, Berber B, Ericsson M, Alsudani H, Ergul A, Beyaz S, Lemasters JJ, Ogretmen B, Albayram O. p17/C18-ceramide-mediated mitophagy is an endogenous neuroprotective response in preclinical and clinical brain injury. PNAS NEXUS 2024; 3:pgae018. [PMID: 38328780 PMCID: PMC10847724 DOI: 10.1093/pnasnexus/pgae018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 01/10/2024] [Indexed: 02/09/2024]
Abstract
Repeat concussions (or repetitive mild traumatic brain injury [rmTBI]) are complex pathological processes consisting of a primary insult and long-term secondary complications and are also a prerequisite for chronic traumatic encephalopathy (CTE). Recent evidence implies a significant role of autophagy-mediated dysfunctional mitochondrial clearance, mitophagy, in the cascade of secondary deleterious events resulting from TBI. C18-ceramide, a bioactive sphingolipid produced in response to cell stress and damage, and its synthesizing enzyme (CerS1) are precursors to selective stress-mediated mitophagy. A transporter, p17, mediates the trafficking of CerS1, induces C18-ceramide synthesis in the mitochondrial membrane, and acts as an elimination signal in cell survival. Whether p17-mediated mitophagy occurs in the brain and plays a causal role in mitochondrial quality control in secondary disease development after rmTBI are unknown. Using a novel repetitive less-than-mild TBI (rlmTBI) injury paradigm, ablation of mitochondrial p17/C18-ceramide trafficking in p17 knockout (KO) mice results in a loss of C18-ceramide-induced mitophagy, which contributes to susceptibility and recovery from long-term secondary complications associated with rlmTBI. Using a ceramide analog with lipid-selenium conjugate drug, LCL768 restored mitophagy and reduced long-term secondary complications, improving cognitive deficits in rlmTBI-induced p17KO mice. We obtained a significant reduction of p17 expression and a considerable decrease of CerS1 and C18-ceramide levels in cortical mitochondria of CTE human brains compared with age-matched control brains. These data demonstrated that p17/C18-ceramide trafficking is an endogenous neuroprotective mitochondrial stress response following rlmTBI, thus suggesting a novel prospective strategy to interrupt the CTE consequences of concussive TBI.
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Affiliation(s)
- Eda Karakaya
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Natalia Oleinik
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Jazlyn Edwards
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Jensen Tomberlin
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Randy Bent Barker
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Burak Berber
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Biology, Eskisehir Technical University, Tepebasi/Eskisehir 26555, Turkey
| | - Maria Ericsson
- Electron Microscopy Laboratory, Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Habeeb Alsudani
- Cancer Center, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA
- College of Science, University of Basrah, Basra 61004, Iraq
| | - Adviye Ergul
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
- Ralph H. Jackson Department of Veterans Affairs Medical Center, Charleston, SC 29425, USA
| | - Semir Beyaz
- Cancer Center, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA
| | - John J Lemasters
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
- Department of Drug Discovery and Biomedical Sciences, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Besim Ogretmen
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
- Hollings Cancer Center, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Onder Albayram
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, Charleston, SC 29425, USA
- Ralph H. Jackson Department of Veterans Affairs Medical Center, Charleston, SC 29425, USA
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC 29425, USA
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Turek J, Gąsior Ł. Estrogen fluctuations during the menopausal transition are a risk factor for depressive disorders. Pharmacol Rep 2023; 75:32-43. [PMID: 36639604 PMCID: PMC9889489 DOI: 10.1007/s43440-022-00444-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 12/20/2022] [Accepted: 12/22/2022] [Indexed: 01/15/2023]
Abstract
Women are significantly more likely to develop depression than men. Fluctuations in the ovarian estrogen hormone levels are closely linked with women's well-being. This narrative review discusses the available knowledge on the role of estrogen in modulating brain function and the correlation between changes in estrogen levels and the development of depression. Equally discussed are the possible mechanisms underlying these effects, including the role of estrogen in modulating brain-derived neurotrophic factor activity, serotonin neurotransmission, as well as the induction of inflammatory response and changes in metabolic activity, are discussed.
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Affiliation(s)
- Justyna Turek
- Department of Neurobiology, Maj Institute of Pharmacology Polish Academy of Sciences, Smetna 12 Street, 31-343 Krakow, Poland
| | - Łukasz Gąsior
- Department of Neurobiology, Maj Institute of Pharmacology Polish Academy of Sciences, Smetna 12 Street, 31-343 Krakow, Poland
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Ibrahim Fouad G. Sulforaphane, an Nrf-2 Agonist, Modulates Oxidative Stress and Inflammation in a Rat Model of Cuprizone-Induced Cardiotoxicity and Hepatotoxicity. Cardiovasc Toxicol 2023; 23:46-60. [PMID: 36650404 PMCID: PMC9859885 DOI: 10.1007/s12012-022-09776-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 12/27/2022] [Indexed: 01/19/2023]
Abstract
Cuprizone (CPZ) is a neurotoxic agent that is used to induce demyelination and neurotoxicity in rats. This study aimed to investigate the protective potential of sulforaphane (SF), nuclear factor E2 related factor (Nrf-2) activator, against CPZ-induced cardiotoxicity and hepatotoxicity. Male adult Wistar rats (n = 18) were fed with a regular diet or a CPZ-contained diet (0.2%) for four weeks. The rats were divided into three groups (n = 6): negative control rats, CPZ-exposed rats, and CPZ + SF treated rats. SF was intraperitoneally administrated (2 mg/kg/day) for two weeks. The anti-inflammatory and anti-oxidative functions of SF were investigated biochemically, histologically, and immunohistochemically. CPZ increased serum levels of cardiac troponin 1 (CTn1), aspartate amino transaminase (AST), alanine amino transaminase (ALT), and alkaline phosphatase (ALP). In addition, serum levels of inflammatory interferon-gamma (IFN-γ), and pro-inflammatory interleukin 1β (IL-1β) were significantly elevated. Moreover, CPZ administration provoked oxidative stress as manifested by declined serum levels of total antioxidant capacity (TAC), as well as, stimulated lipid peroxidation and decreased catalase activities in both cardiac and hepatic tissues. SF treatment reversed all these biochemical alterations through exerting anti-oxidative and anti-inflammatory activities, and this was supported by histopathological investigations in both cardiac and hepatic tissues. This SF-triggered modulation of oxidative stress and inflammation is strongly associated with Nrf-2 activation, as evidenced by activated immunoexpression in both cardiac and hepatic tissues. This highlights the cardioprotective and hepatoprotective activities of SF via Nrf-2 activation and enhancing catalase function.
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Affiliation(s)
- Ghadha Ibrahim Fouad
- Department of Therapeutic Chemistry, Pharmaceutical and Drug Industries Research Institute, National Research Centre, 33 El-Bohouth St., Dokki, Cairo, 12622, Egypt.
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4
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López-Taboada I, Sal-Sarria S, Vallejo G, Coto-Montes A, Conejo NM, González-Pardo H. Sexual dimorphism in spatial learning and brain metabolism after exposure to a western diet and early life stress in rats. Physiol Behav 2022; 257:113969. [PMID: 36181786 DOI: 10.1016/j.physbeh.2022.113969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 09/17/2022] [Accepted: 09/22/2022] [Indexed: 01/06/2023]
Abstract
Prolonged daily intake of Western-type diet rich in saturated fats and sugars, and exposure to early life stress have been independently linked to impaired neurodevelopment and behaviour in animal models. However, sex-specific effects of both environmental factors combined on spatial learning and memory, behavioural flexibility, and brain oxidative capacity have still not been addressed. The current study aimed to evaluate the impact of maternal and postnatal exposure to a high-fat and high-sugar diet (HFS), and exposure to early life stress by maternal separation in adult male and female Wistar rats. For this purpose, spatial learning and memory and behavioural flexibility were evaluated in the Morris water maze, and regional brain oxidative capacity and oxidative stress levels were measured in the hippocampus and medial prefrontal cortex. Spatial memory, regional brain oxidative metabolism, and levels of oxidative stress differed between females and males, suggesting sexual dimorphism in the effects of a HFS diet and early life stress. Males fed the HFS diet performed better than all other experimental groups independently of early life stress exposure. However, behavioural flexibility evaluated in the spatial reversal leaning task was impaired in males fed the HFS diet. In addition, exposure to maternal separation or the HFS diet increased the metabolic capacity of the prefrontal cortex and dorsal hippocampus in males and females. Levels of oxidative stress measured in the latter brain regions were also increased in groups fed the HFS diet, but maternal separation seemed to dampen regional brain oxidative stress levels. Therefore, these results suggest a compensatory effect resulting from the interaction between prolonged exposure to a HFS diet and early life stress.
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Affiliation(s)
- Isabel López-Taboada
- Laboratory of Neuroscience, Department of Psychology, Faculty of Psychology, University of Oviedo, Plaza Feijoo s/n, 33003, Oviedo, Spain; Institute of Neurosciences of the Principality of Asturias (INEUROPA), Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. del Hospital Universitario s/n, 33011 Oviedo, Spain
| | - Saúl Sal-Sarria
- Laboratory of Neuroscience, Department of Psychology, Faculty of Psychology, University of Oviedo, Plaza Feijoo s/n, 33003, Oviedo, Spain; Institute of Neurosciences of the Principality of Asturias (INEUROPA), Oviedo, Spain
| | - Guillermo Vallejo
- Methodology area, Department of Psychology, Faculty of Psychology, University of Oviedo, Plaza Feijoo s/n, 33003 Oviedo, Spain
| | - Ana Coto-Montes
- Institute of Neurosciences of the Principality of Asturias (INEUROPA), Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. del Hospital Universitario s/n, 33011 Oviedo, Spain; Department of Morphology and Cell Biology, Faculty of Medicine, University of Oviedo, Julián Clavería s/n, 33006 Oviedo, Spain
| | - Nélida M Conejo
- Laboratory of Neuroscience, Department of Psychology, Faculty of Psychology, University of Oviedo, Plaza Feijoo s/n, 33003, Oviedo, Spain; Institute of Neurosciences of the Principality of Asturias (INEUROPA), Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. del Hospital Universitario s/n, 33011 Oviedo, Spain.
| | - Héctor González-Pardo
- Laboratory of Neuroscience, Department of Psychology, Faculty of Psychology, University of Oviedo, Plaza Feijoo s/n, 33003, Oviedo, Spain; Institute of Neurosciences of the Principality of Asturias (INEUROPA), Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Av. del Hospital Universitario s/n, 33011 Oviedo, Spain
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5
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Morén C, Treder N, Martínez-Pinteño A, Rodríguez N, Arbelo N, Madero S, Gómez M, Mas S, Gassó P, Parellada E. Systematic Review of the Therapeutic Role of Apoptotic Inhibitors in Neurodegeneration and Their Potential Use in Schizophrenia. Antioxidants (Basel) 2022; 11:2275. [PMID: 36421461 PMCID: PMC9686909 DOI: 10.3390/antiox11112275] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 11/02/2022] [Accepted: 11/03/2022] [Indexed: 09/15/2023] Open
Abstract
Schizophrenia (SZ) is a deleterious brain disorder affecting cognition, emotion and reality perception. The most widely accepted neurochemical-hypothesis is the imbalance of neurotransmitter-systems. Depleted GABAergic-inhibitory function might produce a regionally-located dopaminergic and glutamatergic-storm in the brain. The dopaminergic-release may underlie the positive psychotic-symptoms while the glutamatergic-release could prompt the primary negative symptoms/cognitive deficits. This may occur due to excessive synaptic-pruning during the neurodevelopmental stages of adolescence/early adulthood. Thus, although SZ is not a neurodegenerative disease, it has been suggested that exaggerated dendritic-apoptosis could explain the limited neuroprogression around its onset. This apoptotic nature of SZ highlights the potential therapeutic action of anti-apoptotic drugs, especially at prodromal stages. If dysregulation of apoptotic mechanisms underlies the molecular basis of SZ, then anti-apoptotic molecules could be a prodromal therapeutic option to halt or prevent SZ. In fact, risk alleles related in apoptotic genes have been recently associated to SZ and shared molecular apoptotic changes are common in the main neurodegenerative disorders and SZ. PRISMA-guidelines were considered. Anti-apoptotic drugs are commonly applied in classic neurodegenerative disorders with promising results. Despite both the apoptotic-hallmarks of SZ and the widespread use of anti-apoptotic targets in neurodegeneration, there is a strikingly scarce number of studies investigating anti-apoptotic approaches in SZ. We analyzed the anti-apoptotic approaches conducted in neurodegeneration and the potential applications of such anti-apoptotic therapies as a promising novel therapeutic strategy, especially during early stages.
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Affiliation(s)
- Constanza Morén
- Barcelona Clínic Schizophrenia Unit (BCSU), Institute of Neuroscience, Psychiatry and Psychology Service, Hospital Clínic of Barcelona, University of Barcelona, 08036 Barcelona, Spain
- Clinical and Experimental Neuroscience Area, The August Pi i Sunyer Biomedical Research Institute (IDIBAPS), 08036 Barcelona, Spain
- U722 Group, Centro de Investigación Biomédica en Red de Enfermedades Raras, CIBERER, Carlos III Health Institute, 28029 Madrid, Spain
- Department of Basic Clinical Practice, Pharmacology Unit, University of Barcelona, 08036 Barcelona, Spain
| | - Nina Treder
- Faculty of Psychology and Neuroscience, Maastricht University, 6211 LK Maastricht, The Netherlands
| | - Albert Martínez-Pinteño
- Department of Basic Clinical Practice, Pharmacology Unit, University of Barcelona, 08036 Barcelona, Spain
| | - Natàlia Rodríguez
- Department of Basic Clinical Practice, Pharmacology Unit, University of Barcelona, 08036 Barcelona, Spain
| | - Néstor Arbelo
- Barcelona Clínic Schizophrenia Unit (BCSU), Institute of Neuroscience, Psychiatry and Psychology Service, Hospital Clínic of Barcelona, University of Barcelona, 08036 Barcelona, Spain
- G04 Group, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, 28029 Madrid, Spain
| | - Santiago Madero
- Barcelona Clínic Schizophrenia Unit (BCSU), Institute of Neuroscience, Psychiatry and Psychology Service, Hospital Clínic of Barcelona, University of Barcelona, 08036 Barcelona, Spain
- G04 Group, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, 28029 Madrid, Spain
| | - Marta Gómez
- Barcelona Clínic Schizophrenia Unit (BCSU), Institute of Neuroscience, Psychiatry and Psychology Service, Hospital Clínic of Barcelona, University of Barcelona, 08036 Barcelona, Spain
- G04 Group, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, 28029 Madrid, Spain
- Department of Psychiatry, Servizo Galego de Saúde (SERGAS), 36001 Pontevedra, Spain
| | - Sergi Mas
- Clinical and Experimental Neuroscience Area, The August Pi i Sunyer Biomedical Research Institute (IDIBAPS), 08036 Barcelona, Spain
- Department of Basic Clinical Practice, Pharmacology Unit, University of Barcelona, 08036 Barcelona, Spain
- G04 Group, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, 28029 Madrid, Spain
| | - Patricia Gassó
- Clinical and Experimental Neuroscience Area, The August Pi i Sunyer Biomedical Research Institute (IDIBAPS), 08036 Barcelona, Spain
- Department of Basic Clinical Practice, Pharmacology Unit, University of Barcelona, 08036 Barcelona, Spain
- G04 Group, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, 28029 Madrid, Spain
| | - Eduard Parellada
- Barcelona Clínic Schizophrenia Unit (BCSU), Institute of Neuroscience, Psychiatry and Psychology Service, Hospital Clínic of Barcelona, University of Barcelona, 08036 Barcelona, Spain
- Clinical and Experimental Neuroscience Area, The August Pi i Sunyer Biomedical Research Institute (IDIBAPS), 08036 Barcelona, Spain
- Department of Basic Clinical Practice, Pharmacology Unit, University of Barcelona, 08036 Barcelona, Spain
- G04 Group, Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Carlos III Health Institute, 28029 Madrid, Spain
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6
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Shaw GA. Mitochondria as the target for disease related hormonal dysregulation. Brain Behav Immun Health 2021; 18:100350. [PMID: 34746877 PMCID: PMC8554460 DOI: 10.1016/j.bbih.2021.100350] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 09/12/2021] [Accepted: 09/17/2021] [Indexed: 12/13/2022] Open
Abstract
Mitochondria play an important role in the synthesis of steroid hormones, including the sex hormone estrogen. Sex-specific regulation of these hormones is important for phenotypic development and downstream, sex-specific activational effects in both brain and behavior. First, mitochondrial contribution to the synthesis of estrogen, followed by a discussion of the signaling interactions between estrogen and the mitochondria will be reviewed. Next, disorders with an established sex difference related to aging, mood, and cognition will be examined. Finally, review of mitochondria as a biomarker of disease and data supporting efforts in targeting mitochondria as a therapeutic target for the amelioration of these disorders will be discussed. Taken together, this review aims to assess the influence of E2 on mitochondrial function within the brain via exploration of E2-ER interactions within neural mitochondria and how they may act to influence the development and presentation of neurodegenerative and neurocognitive diseases with known sex differences.
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Affiliation(s)
- Gladys A. Shaw
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, Richmond, VA, USA
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7
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Vandenberg GG, Thotakura A, Scott AL. Mitochondrial bioenergetics of astrocytes in Fragile X Syndrome: new perspectives from culture conditions and sex effects. Am J Physiol Cell Physiol 2021; 322:C125-C135. [PMID: 34817267 DOI: 10.1152/ajpcell.00130.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fragile X syndrome is a genetic disorder that is characterized by a range of cognitive and behavioural deficits, including mild-moderate intellectual disability. The disease is characterized by an X-linked mutation of the Fmr1 gene, which causes silencing of the gene coding for FMRP, a translational regulator integral for neurodevelopment. Mitochondrial dysfunction has been recently associated with FXS, with reports of increases in oxidative stress markers, reactive oxygen species, and lipid peroxidation being present in brain tissue. Astrocytes, a prominent glial cell within the CNS, plays a large role in regulating oxidative homeostasis within the developing brain and dysregulation of astrocyte redox balance in FXS may contribute to oxidative stress. Astrocyte function and mitochondrial bioenergetics is significantly influenced by oxygen availability as well as circulating sex hormones; yet these parameters are rarely considered during in vitro experimentation. Given that the brain normally develops in a range of hypoxic conditions and FXS is a sex-linked genetic disorder, we investigated how different oxygen levels (normoxic versus hypoxic) and biological sex affected mitochondrial bioenergetics of astrocytes in FXS. Our results show demonstrate that both mitochondrial respiration capacity and reactive oxygen species emission are altered with Fmr1 deletion in astrocytes and these changes were dependent upon both sexual dimorphism and oxygen availability.
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Affiliation(s)
- Gregory G Vandenberg
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Aasritha Thotakura
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Angela L Scott
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
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8
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Shaw GA, Hyer MM, Dustin E, Dyer SK, Targett IL, Neigh GN. Acute LPS exposure increases synaptosomal metabolism during estrus but not diestrus. Physiol Behav 2021; 239:113523. [PMID: 34229031 DOI: 10.1016/j.physbeh.2021.113523] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 06/09/2021] [Accepted: 06/30/2021] [Indexed: 11/15/2022]
Abstract
The hormones estrogen and progesterone alter physiological functions, including the estrus cycle and relevant neurological and synaptic activity. Here, we determined the extent to which estrus cycle stage interacts with an inflammatory stimulus, lipopolysaccharide (LPS), to alter synaptic mitochondrial respiration in female rats. LPS elevated synaptic mitochondrial respiration of rats in estrus, but not diestrus. Likewise, estrogen concentration correlated with multiple respiratory metrics in LPS treated females in estrus. These data suggest estrogen likely modulates synaptic mitochondrial respiration in a high progesterone environment.
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Affiliation(s)
- Gladys A Shaw
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, 1101 East Marshall Street, Box 980709, Richmond, VA 23298, United States
| | - Molly M Hyer
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, 1101 East Marshall Street, Box 980709, Richmond, VA 23298, United States
| | - Elizabeth Dustin
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, 1101 East Marshall Street, Box 980709, Richmond, VA 23298, United States
| | - Samya K Dyer
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, 1101 East Marshall Street, Box 980709, Richmond, VA 23298, United States
| | - Imogen L Targett
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, 1101 East Marshall Street, Box 980709, Richmond, VA 23298, United States
| | - Gretchen N Neigh
- Department of Anatomy and Neurobiology, Virginia Commonwealth University, 1101 East Marshall Street, Box 980709, Richmond, VA 23298, United States.
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Xu J, Zhou Y, Yan C, Wang X, Lou J, Luo Y, Gao S, Wang J, Wu L, Gao X, Shao A. Neurosteroids: A novel promise for the treatment of stroke and post-stroke complications. J Neurochem 2021; 160:113-127. [PMID: 34482541 DOI: 10.1111/jnc.15503] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 08/22/2021] [Accepted: 08/23/2021] [Indexed: 01/14/2023]
Abstract
Stroke is the primary reason for death and disability worldwide, with few treatment strategies to date. Neurosteroids, which are natural molecules in the brain, have aroused great interest in the field of stroke. Neurosteroids are a kind of steroid that acts on the nervous system, and are synthesized in the mitochondria of neurons or glial cells using cholesterol or other steroidal precursors. Neurosteroids mainly include estrogen, progesterone (PROG), allopregnanolone, dehydroepiandrosterone (DHEA), and vitamin D (VD). Most of the preclinical studies have confirmed that neurosteroids can decrease the risk of stroke, and improve stroke outcomes. In the meantime, neurosteroids have been shown to have a positive therapeutic significance in some post-stroke complications, such as epilepsy, depression, anxiety, cardiac complications, movement disorders, and post-stroke pain. In this review, we report the historical background, modulatory mechanisms of neurosteroids in stroke and post-stroke complications, and emphasize on the application prospect of neurosteroids in stroke therapy.
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Affiliation(s)
- Jiawei Xu
- The First Affiliated Hospital of Zhejiang, Chinese Medical University, Hangzhou, Zhejiang, China
| | - Yunxiang Zhou
- Department of Surgical Oncology, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Caochong Yan
- The Key Laboratory of Reproductive Genetics, Ministry of Education, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xiaoyu Wang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Jianyao Lou
- Department of General Surgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Yi Luo
- The Second Affiliated Hospital of Zhejiang University School of Medicine (Changxing Branch), Changxing, Huzhou, Zhejiang, China
| | - Shiqi Gao
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Junjie Wang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Liang Wu
- Department of Pathology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Xiangfu Gao
- The First Affiliated Hospital of Zhejiang, Chinese Medical University, Hangzhou, Zhejiang, China
| | - Anwen Shao
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China
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10
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Reis de Assis D, Szabo A, Requena Osete J, Puppo F, O’Connell KS, A. Akkouh I, Hughes T, Frei E, A. Andreassen O, Djurovic S. Using iPSC Models to Understand the Role of Estrogen in Neuron-Glia Interactions in Schizophrenia and Bipolar Disorder. Cells 2021; 10:209. [PMID: 33494281 PMCID: PMC7909800 DOI: 10.3390/cells10020209] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 12/08/2020] [Accepted: 01/19/2021] [Indexed: 01/04/2023] Open
Abstract
Schizophrenia (SCZ) and bipolar disorder (BIP) are severe mental disorders with a considerable disease burden worldwide due to early age of onset, chronicity, and lack of efficient treatments or prevention strategies. Whilst our current knowledge is that SCZ and BIP are highly heritable and share common pathophysiological mechanisms associated with cellular signaling, neurotransmission, energy metabolism, and neuroinflammation, the development of novel therapies has been hampered by the unavailability of appropriate models to identify novel targetable pathomechanisms. Recent data suggest that neuron-glia interactions are disturbed in SCZ and BIP, and are modulated by estrogen (E2). However, most of the knowledge we have so far on the neuromodulatory effects of E2 came from studies on animal models and human cell lines, and may not accurately reflect many processes occurring exclusively in the human brain. Thus, here we highlight the advantages of using induced pluripotent stem cell (iPSC) models to revisit studies of mechanisms underlying beneficial effects of E2 in human brain cells. A better understanding of these mechanisms opens the opportunity to identify putative targets of novel therapeutic agents for SCZ and BIP. In this review, we first summarize the literature on the molecular mechanisms involved in SCZ and BIP pathology and the beneficial effects of E2 on neuron-glia interactions. Then, we briefly present the most recent developments in the iPSC field, emphasizing the potential of using patient-derived iPSCs as more relevant models to study the effects of E2 on neuron-glia interactions.
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Affiliation(s)
- Denis Reis de Assis
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Medical Genetics, Oslo University Hospital, 0450 Oslo, Norway
| | - Attila Szabo
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Medical Genetics, Oslo University Hospital, 0450 Oslo, Norway
| | - Jordi Requena Osete
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Medical Genetics, Oslo University Hospital, 0450 Oslo, Norway
| | - Francesca Puppo
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Neurosciences, University of California San Diego, La Jolla, CA 92093, USA
| | - Kevin S. O’Connell
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
| | - Ibrahim A. Akkouh
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Medical Genetics, Oslo University Hospital, 0450 Oslo, Norway
| | - Timothy Hughes
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Medical Genetics, Oslo University Hospital, 0450 Oslo, Norway
| | - Evgeniia Frei
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Department of Medical Genetics, Oslo University Hospital, 0450 Oslo, Norway
| | - Ole A. Andreassen
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- Division of Mental Health and Addiction, Oslo University Hospital, 0372 Oslo, Norway
| | - Srdjan Djurovic
- NORMENT, Institute of Clinical Medicine, University of Oslo & Division of Mental Health and Addiction, Oslo University Hospital, 0450 Oslo, Norway; (A.S.); (J.R.O.); (F.P.); (K.S.O.); (I.A.A.); (T.H.); (E.F.); (O.A.A.)
- NORMENT, Department of Clinical Science, University of Bergen, 5020 Bergen, Norway
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11
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Wang N, Zeng Z, Wang B, Qin D, Wang T, Wang C, Guo S. High serum creatinine is associated with reduction of psychiatric symptoms in female patients with anti-NMDAR encephalitis. Neurosci Lett 2021; 746:135650. [PMID: 33485991 DOI: 10.1016/j.neulet.2021.135650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/21/2020] [Accepted: 01/07/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Serum creatinine (SCR) has been shown to be associated with many neurodegenerative diseases. In this study, we investigated the relationship between SCR levels and the incidence of psychiatric symptoms in patients with anti-N-methyl-d-aspartate receptor (anti-NMDAR) encephalitis. METHODS The SCR levels were tested in 69 patients with anti-NMDAR encephalitis at admission. Clinical characteristics and blood and CSF parameters were compared between the group of patients with psychiatric symptoms (P + group) and the group of those without psychiatric symptoms (P- group). The association between SCR and the incidence of psychiatric symptoms was determined by multivariate-adjusted linear regression analyses. RESULTS The SCR levels in the P + group were significantly lower than those in the P- group (P < 0.001). In the female subgroup, the SCR levels in the P + group were significantly lower compared to the P- group (P < 0.001), whereas in the male subgroup, the SCR levels did not differ between the two groups (P = 0.084). Furthermore, the highest SCR tercile overall had a significantly lower incidence of psychiatric symptoms than the lowest tercile (P < 0.001), and a significant negative correlation between the SCR levels and the occurrence of psychiatric symptoms was observed (r = -0.392, P < 0.001). Multivariate logistic regression analysis showed that the association was independent after adjusting for age, cystatin C and the modified Rankin Scale (mRS) score (P = 0.001). A similar result was found in the female subgroup (P = 0.010), but not in the male subgroup (P = 0.225). CONCLUSION Our study indicated that the SCR level was negatively correlated with incidence of psychiatric symptoms in female patients, and higher SCR level could be a protective factor for psychiatric symptoms in female patients with anti-NMDAR encephalitis.
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Affiliation(s)
- Ningning Wang
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China
| | - Ziling Zeng
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China
| | - Baojie Wang
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China
| | - Danqing Qin
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China
| | - Tingting Wang
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China
| | - Chunjuan Wang
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China
| | - Shougang Guo
- Department of Neurology, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jing Wu Road, Huaiyin District, Jinan, 250021, Shandong, China.
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12
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Said SA, Isedowo R, Guerin C, Nar NN, Lillie L, Bukovac S, Simone JJ, Green MR, McCormick CM, Stuart JA. Effects of long-term dietary administration of estrogen receptor-beta agonist diarylpropionitrile on ovariectomized female ICR (CD-1) mice. GeroScience 2018; 40:393-403. [PMID: 30099673 DOI: 10.1007/s11357-018-0038-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 08/02/2018] [Indexed: 12/18/2022] Open
Abstract
Diarylpropionitrile (DPN) is an estrogen receptor-β-specific agonist that has been linked to neuroprotection, preserving cognitive function with age, the suppression of anxiety-like behaviors, inhibition of cancer growth, and other positive properties. We hypothesized that DPN may have pro-longevity properties. DPN was administered via feed at a dose corresponding to approximately 3 mg/kg/day to ovariectomized female mice beginning at 7 months of age. Mice were followed for the duration of their lifespans while monitoring body mass, aspects of behavior, learning, memory, and frailty. DPN-treated mice gained more body mass over the first 2 years of age (17 months of the study). A test of voluntary running behavior at 24 months of age behavior revealed no deficits in DPN-treated mice, which were as likely as control mice to engage in extended bouts of wheel running, and did so at higher average speeds. DPN administration had anxiolytic-like effects when measured using an elevated plus maze at 9 months of age. A mouse frailty index was used to assess age-related changes. The correlation between age and frailty differed between control and DPN-treated mice. Overall, dietary DPN administration had some beneficial effects on the aging phenotype of ovariectomized female mice with few significant detrimental effects.
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Affiliation(s)
- Sherry A Said
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Rachel Isedowo
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Christilynn Guerin
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Navreek N Nar
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Leesa Lillie
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Shawn Bukovac
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.,Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Jonathan J Simone
- Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Matthew R Green
- Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Cheryl M McCormick
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.,Department of Psychology, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada
| | - Jeffrey A Stuart
- Department of Biological Sciences, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, ON, L2S 3A1, Canada.
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13
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Namjoo Z, Moradi F, Aryanpour R, Piryaei A, Joghataei MT, Abbasi Y, Hosseini A, Hassanzadeh S, Taklimie FR, Beyer C, Zendedel A. Combined effects of rat Schwann cells and 17β-estradiol in a spinal cord injury model. Metab Brain Dis 2018; 33:1229-1242. [PMID: 29658057 DOI: 10.1007/s11011-018-0220-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 03/15/2018] [Indexed: 12/31/2022]
Abstract
Spinal cord injury (SCI) is a devastating traumatic event which burdens the affected individuals and the health system. Schwann cell (SC) transplantation is a promising repair strategy after SCI. However, a large number of SCs do not survive following transplantation. Previous studies demonstrated that 17β-estradiol (E2) protects different cell types and reduces tissue damage in SCI experimental animal model. In the current study, we evaluated the protective potential of E2 on SCs in vitro and investigated whether the combination of hormonal and SC therapeutic strategy has a better effect on the outcome after SCI. Primary SC cultures were incubated with E2 for 72 h. In a subsequent experiment, thoracic contusion SCI was induced in male rats followed by sustained administration of E2 or vehicle. Eight days after SCI, DiI-labeled SCs were transplanted into the injury epicenter in vehicle and E2-treated animals. The combinatory regimen decreased neurological and behavioral deficits and protected neurons and oligodendrocytes in comparison to vehicle rats. Moreover, E2 and SC significantly decreased the number of Iba-1+ (microglia) and GFAP+ cells (astrocyte) in the SCI group. In addition, we found a significant reduction of mitochondrial fission-markers (Fis1) and an increase of fusion-markers (Mfn1 and Mfn2) in the injured spinal cord after E2 and SC treatment. These data demonstrated that E2 protects SCs against hypoxia-induced SCI and improves the survival of transplanted SCs.
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Affiliation(s)
- Zeinab Namjoo
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Sciences, Hemmat Campus, Tehran, Iran
| | - Fateme Moradi
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Sciences, Hemmat Campus, Tehran, Iran
- Cellular and Molecular Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Roya Aryanpour
- Department of Anatomy, Faculty of Medicine, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Abbas Piryaei
- Department of Biology and Anatomical Sciences, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Taghi Joghataei
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Sciences, Hemmat Campus, Tehran, Iran.
- Cellular and Molecular Research Center, Faculty of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| | - Yusef Abbasi
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Sciences, Hemmat Campus, Tehran, Iran
| | - Amir Hosseini
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Sciences, Hemmat Campus, Tehran, Iran
| | - Sajad Hassanzadeh
- Department of Anatomy, Faculty of Medicine, Iran University of Medical Sciences, Hemmat Campus, Tehran, Iran
| | | | - Cordian Beyer
- Institute of Neuroanatomy, RWTH Aachen University, 52074, Aachen, Germany
| | - Adib Zendedel
- Institute of Neuroanatomy, RWTH Aachen University, 52074, Aachen, Germany
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
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14
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Expression and regulation of CYP17A1 and 3β-hydroxysteroid dehydrogenase in cells of the nervous system: Potential effects of vitamin D on brain steroidogenesis. Neurochem Int 2017; 113:46-55. [PMID: 29162485 DOI: 10.1016/j.neuint.2017.11.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 10/16/2017] [Accepted: 11/16/2017] [Indexed: 11/21/2022]
Abstract
Steroids are reported to have diverse functions in the nervous system. Enzymatic production of steroid hormones has been reported in different cell types, including astrocytes and neurons. However, the information on some of the steroidogenic enzymes involved is insufficient in many respects. Contradictory results have been reported concerning the relative importance of different cell types in the nervous system for expression of CYP17A1 and 3β-hydroxysteroid dehydrogenase (3β-HSD). 3β-HSD is important in all basic steroidogenic pathways and CYP17A1 is required to form sex hormones. In the current investigation we studied the expression of these enzymes in cultured primary rat astrocytes, in neuron-enriched cells from rat cerebral cortex and in human neuroblastoma SH-SY5Y cells, a cell line often used as an in vitro model of neuronal function and differentiation. As part of this study we also examined potential effects on CYP17A1 and 3β-HSD by vitamin D, a compound previously shown to have regulatory effects in steroid hormone-producing cells outside the brain. The results of our study indicate that astrocytes are a major site for expression of 3β-HSD whereas expression of CYP17A1 is found in both astrocytes and neurons. The current data suggest that neurons, contrary to some previous reports, are not involved in 3β-HSD reactions. Previous studies have shown that vitamin D can influence gene expression and hormone production by steroidogenic enzymes in some cells. We found that vitamin D suppressed CYP17A1-mediated activity by 20% in SH-SY5Ycells and astrocytes. Suppression of CYP17A1 mRNA levels was considerably stronger, about 50% in SH-SY5Y cells and 75% in astrocytes. In astrocytes 3β-HSD was also suppressed by vitamin D, about 20% at the enzyme activity level and 60% at the mRNA level. These data suggest that vitamin D-mediated regulation of CYP17A1 and 3β-HSD, particularly on the transcriptional level, may play a role in the nervous system.
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15
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Abstract
BACKGROUND Schizophrenia is a chronic psychiatric disorder that generally begins in late adolescence or early adulthood. This early onset is often linked with a devastating lifelong impact on both the social network and work capacities of the affected subjects. Beginning in the mid-1990s, several sets of diagnostic criteria aiming to identify "high-risk" patients were developed and applied in clinical studies. Short-term rates of onset of psychosis in this subgroup of subjects ranged from 20% to 40%. However, 20 years later, the proposal to introduce "psychosis risk syndrome" as a coded diagnostic category in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders remained controversial and was finally rejected. Instead, "attenuated psychosis syndrome" was included in section III of the newly published manual as a condition for further studies. OBJECTIVE The goal of this article is to review the extant literature concerning the advantages and risks of early assessment of psychotic symptoms ("prodrome" and "psychosis-risk syndrome") and concerning available therapeutic options, both psychosocial and pharmacological. CONCLUSIONS "Attenuated psychosis syndrome" is a clinically useful concept. It identifies help-seeking individuals with mental health problems who need an intervention and who, if no treatment strategy is proposed, present a higher likelihood of developing a psychosis spectrum disorder in the years following their first contact with a mental health facility. In parallel with the clinical utility of this concept, additional research focused on this group of patients is warranted to further understand the emerging phase of psychotic disorders and to develop effective and efficient evidence-based prevention strategies.
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16
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Frago LM, Canelles S, Freire-Regatillo A, Argente-Arizón P, Barrios V, Argente J, Garcia-Segura LM, Chowen JA. Estradiol Uses Different Mechanisms in Astrocytes from the Hippocampus of Male and Female Rats to Protect against Damage Induced by Palmitic Acid. Front Mol Neurosci 2017; 10:330. [PMID: 29114202 PMCID: PMC5660686 DOI: 10.3389/fnmol.2017.00330] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 09/29/2017] [Indexed: 01/22/2023] Open
Abstract
An excess of saturated fatty acids can be toxic for tissues, including the brain, and this has been associated with the progression of neurodegenerative diseases. Since palmitic acid (PA) is a free fatty acid that is abundant in the diet and circulation and can be harmful, we have investigated the effects of this fatty acid on lipotoxicity in hippocampal astrocytes and the mechanism involved. Moreover, as males and females have different susceptibilities to some neurodegenerative diseases, we accessed the responses of astrocytes from both sexes, as well as the possible involvement of estrogens in the protection against fatty acid toxicity. PA increased endoplasmic reticulum stress leading to cell death in astrocytes from both males and females. Estradiol (E2) increased the levels of protective factors, such as Hsp70 and the anti-inflammatory cytokine interleukin-10, in astrocytes from both sexes. In male astrocytes, E2 decreased pJNK, TNFα, and caspase-3 activation. In contrast, in female astrocytes E2 did not affect the activation of JNK or TNFα levels, but decreased apoptotic cell death. Hence, although E2 exerted protective effects against the detrimental effects of PA, the mechanisms involved appear to be different between male and female astrocytes. This sexually dimorphic difference in the protective mechanisms induced by E2 could be involved in the different susceptibilities of males and females to some neurodegenerative processes.
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Affiliation(s)
- Laura M Frago
- Departamento de Pediatría, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
| | - Sandra Canelles
- Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
| | - Alejandra Freire-Regatillo
- Departamento de Pediatría, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
| | - Pilar Argente-Arizón
- Departamento de Pediatría, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
| | - Vicente Barrios
- Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
| | - Jesús Argente
- Departamento de Pediatría, Universidad Autónoma de Madrid, Madrid, Spain.,Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain.,IMDEA Food Institute, Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | - Luis M Garcia-Segura
- Instituto Cajal, Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain.,CIBER de Investigación Biomédica en Red de Fragilidad y Envejecimiento Saludable (CIBERFES), Instituto de Salud Carlos III, Madrid, Spain
| | - Julie A Chowen
- Departamento de Endocrinología, Hospital Infantil Universitario Niño Jesús, Madrid, Spain.,Instituto de Investigación Sanitaria Princesa, Madrid, Spain.,Centro de Investigación Biomédica en Red de Fisiopatología de la Obesidad y Nutrición, Instituto de Salud Carlos III, Madrid, Spain
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17
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Cuprizone-Containing Pellets Are Less Potent to Induce Consistent Demyelination in the Corpus Callosum of C57BL/6 Mice. J Mol Neurosci 2017; 61:617-624. [PMID: 28238065 DOI: 10.1007/s12031-017-0903-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 02/16/2017] [Indexed: 01/06/2023]
Abstract
The chopper chelator cuprizone serves as a valuable chemical tool to induce consistent and reproducible demyelination in the central nervous system. However, the daily preparation of fresh cuprizone powder mixed in finely ground rodent chow might well be a particular health problem. Alternative methods, such as the fabrication of cuprizone-containing pellets, are available. The effectiveness of this method is, however, not known. In the present study, we compared whether intoxication of C57BL/6 mice with 0.25% cuprizone mixed into ground rodent chow does induce demyelination to a similar extent compared to a cuprizone-pellet intoxication protocol. We found that feeding of 0.25% cuprizone in ground chow provides a strong, well-defined, and reproducible demyelination along with increased accumulation of microglia and axonal damage in the corpus callosum, whereas all analyzed parameters were significantly less distinct in mice fed with cuprizone-containing pellets at an equivalent concentration of cuprizone at week 5. Even a higher concentration of cuprizone in pellet formulation was less potent compared to do so. This study illustrates that the established protocol of cuprizone intoxication (i.e., mixed in ground rodent chow) is the gold standard method to achieve consistent and reproducible demyelination. Why cuprizone loses its effectiveness in pellet formulation needs to be addressed in subsequent studies.
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18
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Preciados M, Yoo C, Roy D. Estrogenic Endocrine Disrupting Chemicals Influencing NRF1 Regulated Gene Networks in the Development of Complex Human Brain Diseases. Int J Mol Sci 2016; 17:E2086. [PMID: 27983596 PMCID: PMC5187886 DOI: 10.3390/ijms17122086] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 11/21/2016] [Accepted: 11/29/2016] [Indexed: 12/13/2022] Open
Abstract
During the development of an individual from a single cell to prenatal stages to adolescence to adulthood and through the complete life span, humans are exposed to countless environmental and stochastic factors, including estrogenic endocrine disrupting chemicals. Brain cells and neural circuits are likely to be influenced by estrogenic endocrine disruptors (EEDs) because they strongly dependent on estrogens. In this review, we discuss both environmental, epidemiological, and experimental evidence on brain health with exposure to oral contraceptives, hormonal therapy, and EEDs such as bisphenol-A (BPA), polychlorinated biphenyls (PCBs), phthalates, and metalloestrogens, such as, arsenic, cadmium, and manganese. Also we discuss the brain health effects associated from exposure to EEDs including the promotion of neurodegeneration, protection against neurodegeneration, and involvement in various neurological deficits; changes in rearing behavior, locomotion, anxiety, learning difficulties, memory issues, and neuronal abnormalities. The effects of EEDs on the brain are varied during the entire life span and far-reaching with many different mechanisms. To understand endocrine disrupting chemicals mechanisms, we use bioinformatics, molecular, and epidemiologic approaches. Through those approaches, we learn how the effects of EEDs on the brain go beyond known mechanism to disrupt the circulatory and neural estrogen function and estrogen-mediated signaling. Effects on EEDs-modified estrogen and nuclear respiratory factor 1 (NRF1) signaling genes with exposure to natural estrogen, pharmacological estrogen-ethinyl estradiol, PCBs, phthalates, BPA, and metalloestrogens are presented here. Bioinformatics analysis of gene-EEDs interactions and brain disease associations identified hundreds of genes that were altered by exposure to estrogen, phthalate, PCBs, BPA or metalloestrogens. Many genes modified by EEDs are common targets of both 17 β-estradiol (E2) and NRF1. Some of these genes are involved with brain diseases, such as Alzheimer's Disease (AD), Parkinson's Disease, Huntington's Disease, Amyotrophic Lateral Sclerosis, Autism Spectrum Disorder, and Brain Neoplasms. For example, the search of enriched pathways showed that top ten E2 interacting genes in AD-APOE, APP, ATP5A1, CALM1, CASP3, GSK3B, IL1B, MAPT, PSEN2 and TNF-underlie the enrichment of the Kyoto Encyclopedia of Genes and Genomes (KEGG) AD pathway. With AD, the six E2-responsive genes are NRF1 target genes: APBB2, DPYSL2, EIF2S1, ENO1, MAPT, and PAXIP1. These genes are also responsive to the following EEDs: ethinyl estradiol (APBB2, DPYSL2, EIF2S1, ENO1, MAPT, and PAXIP1), BPA (APBB2, EIF2S1, ENO1, MAPT, and PAXIP1), dibutyl phthalate (DPYSL2, EIF2S1, and ENO1), diethylhexyl phthalate (DPYSL2 and MAPT). To validate findings from Comparative Toxicogenomics Database (CTD) curated data, we used Bayesian network (BN) analysis on microarray data of AD patients. We observed that both gender and NRF1 were associated with AD. The female NRF1 gene network is completely different from male human AD patients. AD-associated NRF1 target genes-APLP1, APP, GRIN1, GRIN2B, MAPT, PSEN2, PEN2, and IDE-are also regulated by E2. NRF1 regulates targets genes with diverse functions, including cell growth, apoptosis/autophagy, mitochondrial biogenesis, genomic instability, neurogenesis, neuroplasticity, synaptogenesis, and senescence. By activating or repressing the genes involved in cell proliferation, growth suppression, DNA damage/repair, apoptosis/autophagy, angiogenesis, estrogen signaling, neurogenesis, synaptogenesis, and senescence, and inducing a wide range of DNA damage, genomic instability and DNA methylation and transcriptional repression, NRF1 may act as a major regulator of EEDs-induced brain health deficits. In summary, estrogenic endocrine disrupting chemicals-modified genes in brain health deficits are part of both estrogen and NRF1 signaling pathways. Our findings suggest that in addition to estrogen signaling, EEDs influencing NRF1 regulated communities of genes across genomic and epigenomic multiple networks may contribute in the development of complex chronic human brain health disorders.
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Affiliation(s)
- Mark Preciados
- Department of Environmental & Occupational Health, Florida International University, Miami, FL 33199, USA.
| | - Changwon Yoo
- Department of Biostatistics, Florida International University, Miami, FL 33199, USA.
| | - Deodutta Roy
- Department of Environmental & Occupational Health, Florida International University, Miami, FL 33199, USA.
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Phosphodiesterase-5 inhibition promotes remyelination by MCP-1/CCR-2 and MMP-9 regulation in a cuprizone-induced demyelination model. Exp Neurol 2016; 275 Pt 1:143-53. [DOI: 10.1016/j.expneurol.2015.10.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/05/2015] [Accepted: 10/26/2015] [Indexed: 12/27/2022]
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Jaboinski J, Cabral JCC, Campos R, Barros DM. Exposure to methylphenidate during infancy and adolescence in non-human animals and sensitization to abuse of psychostimulants later in life: a systematic review. TRENDS IN PSYCHIATRY AND PSYCHOTHERAPY 2015; 37:107-17. [PMID: 26630401 DOI: 10.1590/2237-6089-2014-0060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 04/25/2015] [Indexed: 11/22/2022]
Abstract
INTRODUCTION Attention deficit hyperactivity disorder (ADHD) is a neuropsychiatric pathology that has an important prevalence among young people and is difficult to diagnose. It is usually treated with methylphenidate, a psychostimulant with a mechanism of action similar to that of cocaine. Previous studies show that repeated use of psychostimulants during childhood or adolescence may sensitize subjects, making them more prone to later abuse of psychostimulant drugs such as cocaine and methamphetamine. OBJECTIVE To review experimental studies in non-human models (rodents and monkeys) treated with methylphenidate during infancy or adolescence and tested for reinforcing effects on psychostimulant drugs in adulthood. METHOD Systematic collection of data was performed on four databases (Web of Knowledge, PsycARTICLE, PubMed and SciELO). The initial search identified 202 articles published from 2009 to 2014, which were screened for eligibility. Seven articles met the inclusion criteria and were reviewed in this study. RESULTS The findings indicate that early exposure to methylphenidate has an effect on an ADHD animal model, specifically, on spontaneously hypertensive strain rats, especially those tested using the self-administration paradigm. CONCLUSION Future studies should prioritize the spontaneously hypertensive rat strain - an animal model of ADHD. Experimental designs comparing different behavioral paradigms and modes of administration using this strain could lead to improved understanding of the effects of exposure to methylphenidate during childhood and adolescence.
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Affiliation(s)
- Juliana Jaboinski
- Institute of Psychology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | | | - Renan Campos
- Institute of Biological Sciences, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
| | - Daniela Marti Barros
- Institute of Biological Sciences, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
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Hoffmann S, Beyer C. Gonadal steroid hormones as therapeutic tools for brain trauma: the time is ripe for more courageous clinical trials to get into emergency medicine. J Steroid Biochem Mol Biol 2015; 146:1-2. [PMID: 25196186 DOI: 10.1016/j.jsbmb.2014.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefanie Hoffmann
- Department of Psychiatry, Psychotherapy and Psychosomatics, Medical School, RWTH Aachen University, 52074 Aachen, Germany
| | - Cordian Beyer
- Institute of Neuroanatomy, RWTH Aachen University, 52074 Aachen, Germany.
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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: 82] [Impact Index Per Article: 9.1] [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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Multiple sclerosis at menopause: Potential neuroprotective effects of estrogen. Maturitas 2014; 80:133-9. [PMID: 25544310 DOI: 10.1016/j.maturitas.2014.11.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 11/19/2014] [Accepted: 11/20/2014] [Indexed: 12/17/2022]
Abstract
Multiple sclerosis (MS) is an autoimmune demyelinating and neurodegenerative condition of the central nervous system that preferentially afflicts women more than men. Low estrogen states such as menopause and the postpartum period favor exacerbations of multiple sclerosis in women with the disease. Existing and emerging evidence suggests a role for estrogen in the alleviation of symptoms and reversal of pathology associated with MS. While clinical evidence is sparse regarding the benefit of estrogen therapy for women at risk for MS exacerbations, scientific data demonstrates that estrogen potentiates numerous neuroprotective effects on the central nervous system (CNS). Estrogens play a wide range of roles involved in MS disease pathophysiology, including increasing antiinflammatory cytokines, decreasing demyelination, and enhancing oxidative and energy producing processes in CNS cells.
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Demarest TG, McCarthy MM. Sex differences in mitochondrial (dys)function: Implications for neuroprotection. J Bioenerg Biomembr 2014; 47:173-88. [PMID: 25293493 DOI: 10.1007/s10863-014-9583-7] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Accepted: 09/14/2014] [Indexed: 12/12/2022]
Abstract
Decades of research have revealed numerous differences in brain structure size, connectivity and metabolism between males and females. Sex differences in neurobehavioral and cognitive function after various forms of central nervous system (CNS) injury are observed in clinical practice and animal research studies. Sources of sex differences include early life exposure to gonadal hormones, chromosome compliment and adult hormonal modulation. It is becoming increasingly apparent that mitochondrial metabolism and cell death signaling are also sexually dimorphic. Mitochondrial metabolic dysfunction is a common feature of CNS injury. Evidence suggests males predominantly utilize proteins while females predominantly use lipids as a fuel source within mitochondria and that these differences may significantly affect cellular survival following injury. These fundamental biochemical differences have a profound impact on energy production and many cellular processes in health and disease. This review will focus on the accumulated evidence revealing sex differences in mitochondrial function and cellular signaling pathways in the context of CNS injury mechanisms and the potential implications for neuroprotective therapy development.
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Affiliation(s)
- Tyler G Demarest
- Program in Neuroscience, University of Maryland School of Medicine, Baltimore, MD, USA,
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25
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Hao M, Li Y, Lin W, Xu Q, Shao N, Zhang Y, Kuang H. Estrogen prevents high-glucose-induced damage of retinal ganglion cells via mitochondrial pathway. Graefes Arch Clin Exp Ophthalmol 2014; 253:83-90. [PMID: 25216739 DOI: 10.1007/s00417-014-2771-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 07/16/2014] [Accepted: 08/04/2014] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Diabetic retinopathy (DR) is a leading cause of acquired blindness in adults. Previous research has shown that the apoptosis of retinal ganglion cells(RGCs) plays an important role in the initiation and development of diabetic retinopathy. The positive effect of estrogen on the nervous system is currently attracting increasing attention. In this study, we investigated whether17β-estradiolum (E2) has protective effects on RGCs in a high-glucose environment. METHODS The cell survival rates were measured by Cell Counting Kit-8, the apoptosis was detected by flow cytometry, the intracellular reactive oxygen species (ROS) levels were examined by immunofluorescence method, and the intracellular mitochondrial membrane potential was examined by confocal microscopy. The expression levels of cytochrome C, Bcl-2, and Bax were analyzed by Western blot method. The effect of estrogen receptor blocker tamoxifen on the RGCs was also evaluated. RESULTS It was found that E2 stabilizes the mitochondrial membrane potential, reduces intracellular ROS levels, up-regulates Bcl-2 expression, inhibits Bax expression, decreases the generation of cytochrome C, and finally reduces the apoptosis of RGC-5 cells in a high-glucose environment. These protective functions could be attributed to E2 receptors, which make E2 a prospective patent application candidate in the treatment of DR. Furthermore, when cells were pre-cultured with tamoxifen, we found that tamoxifen inhibited the shielding effects of E2. CONCLUSION E2 has a broad application prospect in the treatment of DR.
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Affiliation(s)
- Ming Hao
- Department of Endocrinology, The First Clinical Hospital of Harbin Medical University, No. 23 Youzheng Street, NanGang District, Harbin, Heilongjiang Province, China
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Gilani AA, Dash RP, Jivrajani MN, Thakur SK, Nivsarkar M. Evaluation of GABAergic Transmission Modulation as a Novel Functional Target for Management of Multiple Sclerosis: Exploring Inhibitory Effect of GABA on Glutamate-Mediated Excitotoxicity. Adv Pharmacol Sci 2014; 2014:632376. [PMID: 24778644 PMCID: PMC3977453 DOI: 10.1155/2014/632376] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 02/10/2014] [Indexed: 11/27/2022] Open
Abstract
Multiple sclerosis (MS) is an autoimmune inflammatory disease of the central nervous system (CNS) where the communication ability of nerve cells in the brain and spinal cord with each other gets impaired. Some current findings suggest the role of glutamate excitotoxicity in the development and progression of MS. An excess release of glutamate leads to the activation of ionotropic and metabotropic receptors, thus resulting in accumulation of toxic cytoplasmic Ca(2+) and cell death. However, it has been observed that gamma-aminobutyric acid-A (GABAA) receptors located in the nerve terminals activate presynaptic Ca(2+)/calmodulin-dependent signaling to inhibit depolarization-evoked Ca(2+) influx and glutamate release from isolated nerve terminals, which suggest a potential implication of GABAA receptor in management of MS. With this proof of concept, we tried to explore the potential of selective GABAA receptor agonists or positive allosteric modulators (diazepam and phenobarbitone sodium) and GABAA level enhancer (sodium valproate) for management of MS by screening them for their activity in experimental autoimmune encephalomyelitis (EAE) model in rats and cuprizone-induced demyelination model in mice. In this study, sodium valproate was found to show the best activity in the animal models whereas phenobarbitone sodium showed moderate activity. However, diazepam was found to be ineffective.
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Affiliation(s)
- Ankit A Gilani
- Department of Pharmacology and Toxicology, National Institute of Pharmaceutical Education and Research, C/O-B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, S. G. Highway, Thaltej, Ahmedabad, Gujarat 380054, India
| | - Ranjeet Prasad Dash
- Department of Pharmacology and Toxicology, B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, S. G. Highway, Thaltej, Ahmedabad, Gujarat 380054, India
| | - Mehul N Jivrajani
- Department of Pharmacology and Toxicology, B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, S. G. Highway, Thaltej, Ahmedabad, Gujarat 380054, India
| | - Sandeep Kumar Thakur
- Department of Pharmacology and Toxicology, B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, S. G. Highway, Thaltej, Ahmedabad, Gujarat 380054, India
| | - Manish Nivsarkar
- Department of Pharmacology and Toxicology, B. V. Patel Pharmaceutical Education and Research Development (PERD) Centre, S. G. Highway, Thaltej, Ahmedabad, Gujarat 380054, India
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Slotkin TA, Card J, Seidler FJ. Prenatal dexamethasone, as used in preterm labor, worsens the impact of postnatal chlorpyrifos exposure on serotonergic pathways. Brain Res Bull 2013; 100:44-54. [PMID: 24280657 DOI: 10.1016/j.brainresbull.2013.10.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 10/21/2013] [Accepted: 10/28/2013] [Indexed: 11/29/2022]
Abstract
This study explores how glucocorticoids sensitize the developing brain to the organophosphate pesticide, chlorpyrifos. Pregnant rats received a standard therapeutic dose (0.2mg/kg) of dexamethasone on gestational days 17-19; pups were given subtoxic doses of chlorpyrifos on postnatal days 1-4 (1mg/kg, <10% cholinesterase inhibition). We evaluated serotonin (5HT) synaptic function from postnatal day 30 to day 150, assessing the expression of 5HT receptors and the 5HT transporter, along with 5HT turnover (index of presynaptic impulse activity) in brain regions encompassing all the 5HT projections and cell bodies. These parameters are known targets for neurodevelopmental effects of dexamethasone and chlorpyrifos individually. In males, chlorpyrifos evoked overall elevations in the expression of 5HT synaptic proteins, with a progressive increase from adolescence to adulthood; this effect was attenuated by prenatal dexamethasone treatment. The chlorpyrifos-induced upregulation was preceded by deficits in 5HT turnover, indicating that the receptor upregulation was an adaptive response to deficient presynaptic activity. Turnover deficiencies were magnified by dexamethasone pretreatment, worsening the functional impairment caused by chlorpyrifos. In females, chlorpyrifos-induced receptor changes reflected relative sparing of adverse effects compared to males. Nevertheless, prenatal dexamethasone still worsened the 5HT turnover deficits and reduced 5HT receptor expression in females, demonstrating the same adverse interaction. Glucocorticoids are used in 10% of U.S. pregnancies, and are also elevated in maternal stress; accordingly, our results indicate that this group represents a large subpopulation that may have heightened vulnerability to developmental neurotoxicants such as the organophosphates.
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Affiliation(s)
- Theodore A Slotkin
- Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC, USA.
| | - Jennifer Card
- Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC, USA
| | - Frederic J Seidler
- Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC, USA
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Habib P, Dreymueller D, Ludwig A, Beyer C, Dang J. Sex steroid hormone-mediated functional regulation of microglia-like BV-2 cells during hypoxia. J Steroid Biochem Mol Biol 2013; 138:195-205. [PMID: 23792783 DOI: 10.1016/j.jsbmb.2013.06.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Revised: 05/31/2013] [Accepted: 06/04/2013] [Indexed: 01/04/2023]
Abstract
17β-estradiol (E2) and progesterone (P) are neuroprotective hormones in different neurological disorders and in particular under hypoxic conditions in the brain. Both hormones dampen brain-intrinsic immune responses and regulate local glial cell function. Besides astrocytes which are functionally regulated in a manifold and complex manner, especially microglial cells are in the focus of steroid-mediated neuroprotection. In previous studies using a transient brain artery occlusion model, we demonstrated that microglial characteristics are critically modified after the administration of either E2 or P. We here studied the influence of sex steroids on the murine BV-2 microglia cell line under hypoxic conditions. Hypoxia changed the cell morphology from an amoeboid-like phenotype with processes to a rounded shape of secreting cell type. BV-2 cells expressed both estrogen receptor-β and progesterone receptors under each condition. Oxygen deprivation increased the expression of inducible nitric oxide synthetase (iNOS) and up-regulated selected cytokines and chemokines. Both hormones selectively prevented the induction of pro-inflammatory iNOS, interleukin IL-1ß, and chemokine ligand CCL5, whereas anti-inflammatory IL-10 and protective TREM 2 were up-regulated by sex steroids. Sex hormones abrogated hypoxia-dependent reduction of BV-2 phagocytic activity. We demonstrate that BV-2 microglia cells respond to hypoxia by enhanced pro-inflammatory cytokine secretion and reduced phagocytic activity. This effect is prevented by sex steroids resulting in a switch of BV-2 cells from a pro-inflammatory to a more anti-inflammatory phenotype. Anti-inflammatory effects of gonadal steroids might directly be mediated through hormone-microglia interactions in addition to known effects via astroglial regulation.
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Affiliation(s)
- Pardes Habib
- Institute of Neuroanatomy, RWTH Aachen University, 52074 Aachen, Germany
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29
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Habib P, Slowik A, Zendedel A, Johann S, Dang J, Beyer C. Regulation of hypoxia-induced inflammatory responses and M1-M2 phenotype switch of primary rat microglia by sex steroids. J Mol Neurosci 2013; 52:277-85. [PMID: 24163150 DOI: 10.1007/s12031-013-0137-y] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Accepted: 10/03/2013] [Indexed: 01/17/2023]
Abstract
Microglia cells are the primary mediators of the CNS immune defense system and crucial for the outcome of shaping inflammatory responses. They are highly dynamic, moving constantly, and become activated by neuronal signaling under pathological conditions. They fulfill a dual role by not only regulating local neuroinflammation but also conferring neuronal protection. Gonadal steroids are known to exert anti-inflammatory effects in the CNS. Recently, we have shown that the microglial-like cell line BV-2 is hypoxia-sensitive and regulated by gonadal steroids. The present study used primary rat cerebral cortex-derived microglia to analyze whether this cell type directly perceive and respond to acute hypoxia. Second, we investigated whether 17β-estradiol (E2) and progesterone (P) interfere with hypoxia-induced changes. Short-term hypoxia increased the expression of a subset of pro-inflammatory (TNFa, IL1b) and oxidative stress-related (Hif1a) genes. The induction of TNFa and IL1b was counteracted by P. Hypoxia shifted the primary microglia to the pro-inflammatory M1 phenotype. The administration of E2 and P favored the neuroprotective M2 phenotype. Our findings extend previous data obtained with BV-2 cells and show that the primary microglia directly perceive hypoxia which increase their inflammatory activity. Both steroid hormones directly and indirectly interact with the microglia cells by reducing the inflammatory scenario and stimulating neuroprotection.
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Affiliation(s)
- Pardes Habib
- Institute of Neuroanatomy, RWTH Aachen University, 52074, Aachen, Germany
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30
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Stouffer EM, Barry JL. A sex difference in the onset of the latent learning impairment in rats. Dev Psychobiol 2013; 56:1134-41. [PMID: 24122647 DOI: 10.1002/dev.21168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Accepted: 09/06/2013] [Indexed: 11/10/2022]
Abstract
The current study examined a sex difference in the onset of a latent learning impairment in Sprague-Dawley rats. Forty rats (20 male, 20 female) were tested on the Latent Cue Preference (LCP) task at 3 or 11 months of age. Additionally, 19 female rats were tested at 14 or 18 months of age. All rats were given four training trials in the LCP task using a three-compartment box, during which the rats explored a water-paired compartment and an unpaired compartment (each with a different visual cue) on consecutive days. Rats were then water-deprived for 23 hr and given a compartment preference test, in which more time spent in the water-paired compartment demonstrated latent learning. Results showed that 11-month old males and 18-month old females showed impaired latent learning, but 11- and 14-month old females showed intact latent learning, which may possibly be due to the neuroprotective effects of estrogen.
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Affiliation(s)
- Eric M Stouffer
- Department of Psychology, Bloomsburg University of Pennsylvania, 400 E 2nd Street, Bloomsburg, PA, 17815.
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31
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Female gender remains an independent risk factor for poor outcome after acute nontraumatic intracerebral hemorrhage. Neurol Res Int 2013; 2013:219097. [PMID: 24083025 PMCID: PMC3777128 DOI: 10.1155/2013/219097] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 07/06/2013] [Accepted: 07/25/2013] [Indexed: 11/18/2022] Open
Abstract
Objective. To study whether gender influences outcome after intracerebral hemorrhage (ICH). Methods. Cohort study of 245 consecutive adults presenting to the emergency department with spontaneous ICH from January 2006 to December 2008. Patients with subarachnoid hemorrhage, extradural hemorrhage, and recurrence of hemorrhage were excluded. Results. There were no differences noted between genders in stroke severity (NIHSS) at presentation, ICH volume, or intraventricular extension (IVE) of hemorrhage. Despite this, females had 1.94 times higher odds of having a bad outcome (modified Rankin score (mRs) ≥3) as compared to males (95% CI 1.12 to 3.3) and 1.84 times higher odds of early mortality (95% CI 1.02–3.33). analyzing known variables influencing mortality in ICH, the authors found that females did have higher serum glucose levels on arrival (P = 0.0096) and 4.2 times higher odds for a cerebellar involvement than males (95% CI 1.63–10.75). After adjusting for age, NIHSS, glucose levels, hemorrhage volume, and IVE, female gender remained an independent predictor of early mortality (P = 0.0127). Conclusions. Female gender may be an independent predictor of early mortality in ICH patients, even after adjustment for stroke severity, hemorrhage volume, IVE, serum glucose levels, and age.
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Johann S, Beyer C. Neuroprotection by gonadal steroid hormones in acute brain damage requires cooperation with astroglia and microglia. J Steroid Biochem Mol Biol 2013. [PMID: 23196064 DOI: 10.1016/j.jsbmb.2012.11.006] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The neuroactive steroids 17β-estradiol and progesterone control a broad spectrum of neural functions. Besides their roles in the regulation of classical neuroendocrine loops, they strongly influence motor and cognitive systems, behavior, and modulate brain performance at almost every level. Such a statement is underpinned by the widespread and lifelong expression pattern of all types of classical and non-classical estrogen and progesterone receptors in the CNS. The life-sustaining power of neurosteroids for tattered or seriously damaged neurons aroused interest in the scientific community in the past years to study their ability for therapeutic use under neuropathological challenges. Documented by excellent studies either performed in vitro or in adequate animal models mimicking acute toxic or chronic neurodegenerative brain disorders, both hormones revealed a high potency to protect neurons from damage and saved neural systems from collapse. Unfortunately, neurons, astroglia, microglia, and oligodendrocytes are comparably target cells for both steroid hormones. This hampers the precise assignment and understanding of neuroprotective cellular mechanisms activated by both steroids. In this article, we strive for a better comprehension of the mutual reaction between these steroid hormones and the two major glial cell types involved in the maintenance of brain homeostasis, astroglia and microglia, during acute traumatic brain injuries such as stroke and hypoxia. In particular, we attempt to summarize steroid-activated cellular signaling pathways and molecular responses in these cells and their contribution to dampening neuroinflammation and neural destruction. This article is part of a Special Issue entitled 'CSR 2013'.
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Affiliation(s)
- Sonja Johann
- Institute of Neuroanatomy, RWTH Aachen University, D-52074 Aachen, Germany
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Gong P, Hua R, Zhang Y, Zhao H, Tang Z, Mei X, Zhang M, Cui J, Li C. Hypothermia-induced neuroprotection is associated with reduced mitochondrial membrane permeability in a swine model of cardiac arrest. J Cereb Blood Flow Metab 2013; 33:928-34. [PMID: 23486294 PMCID: PMC3677114 DOI: 10.1038/jcbfm.2013.33] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Increasing evidence has shown that mild hypothermia is neuroprotective for comatose patients resuscitated from cardiac arrest, but the mechanism of this protection is not fully understood. The aim of this study was to determine whether prolonged whole-body mild hypothermia inhibits mitochondrial membrane permeability (MMP) in the cerebral cortex after return of spontaneous circulation (ROSC). Thirty-seven inbred Chinese Wuzhishan minipigs were successfully resuscitated after 8 minutes of untreated ventricular fibrillation (VF) and underwent recovery under normothermic (NT) or prolonged whole-body mild hypothermic (HT; 33°C) conditions for 24 or 72 hours. Cerebral samples from the frontal cortex were collected at 24 and 72 hours after ROSC. Mitochondria were isolated by differential centrifugation. At 24 hours, relative to NT, HT was associated with reductions in opening of the mitochondrial permeability transition pore, release of pro-apoptotic substances from mitochondria, caspase 3 cleavage, apoptosis, and neurologic deficit scores, as well as increases in mitochondrial membrane potential and mitochondrial respiration. Together, these findings suggest that mild hypothermia inhibits ischemia-induced increases in MMP, which may provide neuroprotection against cerebral injury after cardiac arrest.
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Affiliation(s)
- Ping Gong
- Department of Emergency, First Hospital affiliated to Dalian Medical University, Dalian, China
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Leclère R, Torregrosa-Muñumer R, Kireev R, García C, Vara E, Tresguerres JAF, Gredilla R. Effect of estrogens on base excision repair in brain and liver mitochondria of aged female rats. Biogerontology 2013; 14:383-94. [PMID: 23666345 DOI: 10.1007/s10522-013-9431-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 05/02/2013] [Indexed: 10/26/2022]
Abstract
Changes in the endocrine system have been suggested to act as signaling factors in the regulation of age-related events. Among the different hormones that have been linked to the aging process, estrogens have been widely investigated. They have been associated with inflammatory and oxidative processes and several investigations have established a relationship between the protective effects of estrogens and the mitochondrial function. Mitochondrial DNA is subjected to continuous oxidative attack by free radicals, and the base excision repair (BER) pathway is the main DNA repair route present in mitochondria. We have investigated the effect of estrogen levels on some of the key enzymes of BER in brain and liver mitochondria. In both tissues, depletion of estrogens led to an increased mitochondrial AP endonuclease (mtAPE1) activity, while restoration of estrogen levels by exogenous supplementation resulted in restitution of control APE1 activity only in liver. Moreover, in hepatic mitochondria, changes in estrogen levels affected the processing of oxidative lesions but not deaminations. Our results suggest that changes in mtAPE1 activity are related to specific translocation of the enzyme from the cytosol into the mitochondria probably due to oxidative stress changes as a consequence of changes in estrogen levels.
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Affiliation(s)
- R Leclère
- Department of Physiology, Faculty of Medicine, Complutense University, Madrid, Spain
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Siriphorn A, Dunham KA, Chompoopong S, Floyd CL. Postinjury administration of 17β-estradiol induces protection in the gray and white matter with associated functional recovery after cervical spinal cord injury in male rats. J Comp Neurol 2013; 520:2630-46. [PMID: 22684936 DOI: 10.1002/cne.23056] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The majority of spinal cord injuries (SCIs) in the clinic occur at the lower cervical levels, resulting in both white and gray matter disruption. In contrast, most experimental models of SCI in rodents induce damage in the thoracic cord, resulting primarily in white matter disruption. To address this disparity, experimental cervical SCI models have been developed. Thus, we used a recently characterized model of cervical hemicontusion SCI in adult male rats to assess the potential therapeutic effect of post-SCI administration of 17β-estradiol. Rats received a hemicontusion at the level of the fifth cervical vertebra (C5) followed by administration of 17β-estradiol via a slow release pellet (0.5 or 5.0 mg/pellet) beginning at 30 minutes post-SCI. Behavioral evaluation of skilled and unskilled forelimb function and locomotor function were conducted for 7 weeks after SCI. Upon conclusion of the behavioral assessments, spinal cords were collected and histochemistry and stereology were conducted to evaluate the effect of treatment on the lesion characteristics. We found that post-SCI administration of 17β-estradiol decreased neuronal loss in the ventral horn, decreased reactive astrogliosis, decreased the immune response, and increased white mater sparing at the lesion epicenter. Additionally, post-SCI administration of 17β-estradiol improved skilled forelimb function and locomotor function. Taken together, these data suggest that post-SCI administration of 17β-estradiol protected both the gray and white matter in cervical SCI. Moreover, this treatment improved function on skilled motor tasks that involve both gray and white matter components, suggesting that this is likely a highly clinically relevant protective strategy.
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Affiliation(s)
- Akkradate Siriphorn
- Center for Glial Biology in Medicine and Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Alabama 35249, USA
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Neuroglobin upregulation induced by 17β-estradiol sequesters cytocrome c in the mitochondria preventing H2O2-induced apoptosis of neuroblastoma cells. Cell Death Dis 2013; 4:e508. [PMID: 23429294 PMCID: PMC3734830 DOI: 10.1038/cddis.2013.30] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The sex steroid hormone 17β-estradiol (E2) upregulates the levels of neuroglobin (NGB), a new neuroprotectant globin, to elicit its neuroprotective effect against H2O2-induced apoptosis. Several mechanisms could be proposed to justify the NGB involvement in E2 prevention of stress-induced apoptotic cell death. Here, we evaluate the ability of E2 to modulate the intracellular NGB localization and the NGB interaction with mitochondrial cytochrome c following the H2O2-induced toxicity. Present results demonstrate that NGB is expressed in the nuclei, mitochondria, and cytosol of human neuroblastoma SK-N-BE cells. E2, but not H2O2 treatment of SK-N-BE cells, reallocates NGB mainly at the mitochondria and contemporarily reduces the number of apoptotic nuclei and the levels of cleaved caspase-3. Remarkably, the E2 treatment strongly increases NGB–cytochrome c association into mitochondria and reduces the levels of cytochrome c into the cytosol of SK-N-BE cells. Although both estrogen receptors (ERα and ERβ) are expressed in the nucleus, mitochondria, and cytosol of SK-N-BE cells, this E2 effect specifically requires the mitochondrial ERβ activity. As a whole, these data demonstrate that the interception of the intrinsic apoptotic pathway into mitochondria (i.e., the prevention of cytochrome c release) is one of the pivotal mechanisms underlying E2-dependent NGB neuroprotection against H2O2 toxicity.
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37
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Slotkin TA, Card J, Infante A, Seidler FJ. Prenatal dexamethasone augments the sex-selective developmental neurotoxicity of chlorpyrifos: implications for vulnerability after pharmacotherapy for preterm labor. Neurotoxicol Teratol 2013; 37:1-12. [PMID: 23416428 DOI: 10.1016/j.ntt.2013.02.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 01/28/2013] [Accepted: 02/02/2013] [Indexed: 01/01/2023]
Abstract
Glucocorticoids are routinely given in preterm labor and are also elevated by maternal stress; organophosphate exposures are virtually ubiquitous, so coexposures to these two agents are pervasive. We administered dexamethasone to pregnant rats on gestational days 17-19 at a standard therapeutic dose (0.2mg/kg); offspring were then given chlorpyrifos on postnatal days 1-4, at a dose (1mg/kg) that produces barely-detectable (<10%) inhibition of brain cholinesterase activity. We evaluated indices for acetylcholine (ACh) synaptic function throughout adolescence, young adulthood and later adulthood, in brain regions possessing the majority of ACh projections and cell bodies; we measured nicotinic ACh receptor binding, hemicholinium-3 binding to the presynaptic choline transporter and choline acetyltransferase activity, all known targets for the adverse developmental effects of dexamethasone and chlorpyrifos given individually. Dexamethasone did not enhance the systemic toxicity of chlorpyrifos, as evidenced by weight gain and measurements of cholinesterase inhibition during chlorpyrifos treatment. Nevertheless, it enhanced the loss of presynaptic ACh function selectively in females, who ordinarily show sparing of organophosphate developmental neurotoxicity relative to males. Females receiving the combined treatment showed decrements in choline transporter binding and choline acetyltransferase activity that were unique (not found with either treatment alone), as well as additive decrements in nicotinic receptor binding. On the other hand, males given dexamethasone showed no augmentation of the effects of chlorpyrifos. Our findings indicate that prior dexamethasone exposure could create a subpopulation that is especially vulnerable to the adverse effects of organophosphates or other developmental neurotoxicants.
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Affiliation(s)
- Theodore A Slotkin
- Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC 27710, USA.
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38
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Mechanism of inhibition of mitochondrial ATP synthase by 17β−Estradiol. J Bioenerg Biomembr 2012; 45:261-70. [DOI: 10.1007/s10863-012-9497-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Accepted: 12/09/2012] [Indexed: 01/11/2023]
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Arnold S. Cytochrome c oxidase and its role in neurodegeneration and neuroprotection. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 748:305-39. [PMID: 22729864 DOI: 10.1007/978-1-4614-3573-0_13] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A hallmark of neurodegenerative diseases, such as Alzheimer's and Parkinson's diseases, and stroke is a malfunction of mitochondria including cytochrome c oxidase (COX), the terminal enzyme complex of the respiratory chain. COX is ascribed a key role based on mainly two regulatory mechanisms. These are the expression of isoforms and the binding of specific allosteric factors to nucleus--encoded subunits. These characteristics represent a unique feature of COX compared with the other respiratory chain complexes. Additional regulatory mechanisms, such as posttranslational modification, substrate availability, and allosteric feedback inhibition by products of the COX reaction, control the enzyme activity in a complex way. In many tissues and cell types, COX represents the rate-limiting enzyme of the respiratory chain which further emphasizes the impact of the regulation of COX as a central site for regulating energy metabolism and oxidative stress. Two of the best-analyzed regulatory mechanisms of COX to date are the allosteric feedback inhibition of the enzyme by its indirect product ATP and the expression of COX subunit IV isoforms. This ATP feedback inhibition of COX requires the expression of COX isoform IV-1. At high ATP/ADP ratios, ADP is exchanged for ATP at the matrix side of COX IV-1 leading to an inhibition of COX activity, thus enabling COX to sense the energy level and to adjust ATP synthesis to energy demand. However, under hypoxic, toxic, and degenerative conditions, COX isoform IV-2 expression is up-regulated and exchanged for COX IV-1 in the enzyme complex. This COX IV isoform switch causes an abolition of the allosteric ATP feedback inhibition of COX and consequently the loss of sensing the energy level. Thus, COX activity is increased leading to higher levels of ATP in neural cells independently of the cellular energy level. Concomitantly, ROS production is increased. Thus, under pathological conditions, neural cells are provided with ATP to meet the energy demand, but at the expense of elevated oxidative stress. This mechanism explains the functional relevance of COX subunit IV isoform expression for cellular energy sensing, ATP production, and oxidative stress levels. This, in turn, affects neural cell function, signaling, and -survival. Thus, COX is a crucial factor in etiology, progression, and prevalence of numerous human neurodegenerative diseases and represents an important target for developing diagnostic and therapeutic tools against those diseases.
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Affiliation(s)
- Susanne Arnold
- Institute for Neuroanatomy, RWTH Aachen University, Wendlingweg 2, Aachen, Germany.
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40
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Arnold S, Victor MB, Beyer C. Estrogen and the regulation of mitochondrial structure and function in the brain. J Steroid Biochem Mol Biol 2012; 131:2-9. [PMID: 22326731 DOI: 10.1016/j.jsbmb.2012.01.012] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2011] [Revised: 09/20/2011] [Accepted: 01/20/2012] [Indexed: 12/20/2022]
Abstract
The mitochondrion is the unquestionable cellular compartment that actively preserves most of the cell functions, such as lipid metabolism, ion homeostasis, energy and ROS production, steroid biosynthesis, and control of apoptotic signaling. Thus, this cell organelle depicts a major drop-in centre for regulatory processes within a cell irrespective of the organ or tissue. However, brain tissue is unique in spite of everything due to its extremely high energy demand and sensitivity to oxidative stress. This makes brain cells, in particular neurons, considerably vulnerable against toxins and challenges that attack the mitochondrial structural organization and energetic performance. Estrogens are known to regulate a multitude of cellular functions in neural cells under physiological conditions but also play a protective role under neuropathological circumstances. In recent years, it became evident that estrogens affect distinct cellular processes by interfering with the bioenergetic mitochondrial compartment. According to the general view, estrogens indirectly regulate the mitochondrion through the control of genomic transcription of mitochondrial-located proteins and modulation of cytoplasmic signaling cascades that act upon mitochondrial physiology. More recent but still arguable data suggest that estrogens might directly signal to the mitochondrion either through classical steroid receptors or novel types of receptors/proteins associated with the mitochondrial compartment. This would allow estrogens to more rapidly modulate the function of a mitochondrion than hitherto discussed. Assuming that this novel perception of steroid action is correct, estrogen might influence the energetic control centre through long-lasting nuclear-associated processes and rapid mitochondria-intrinsic temporary mechanisms. In this article, we would like to particularly accentuate the novel conceptual approach of this duality comprising that estrogens govern the mitochondrial structural integrity and functional capacity by different cellular signaling routes. This article is part of a Special Issue entitled 'Neurosteroids'.
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Affiliation(s)
- Susanne Arnold
- Institute of Neuroanatomy, RWTH Aachen University,Aachen, Germany
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41
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Ulbrich C, Zendedel A, Habib P, Kipp M, Beyer C, Dang J. Long-term cerebral cortex protection and behavioral stabilization by gonadal steroid hormones after transient focal hypoxia. J Steroid Biochem Mol Biol 2012; 131:10-6. [PMID: 22326729 DOI: 10.1016/j.jsbmb.2012.01.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 01/15/2012] [Indexed: 01/15/2023]
Abstract
Sex steroids are neuroprotective following traumatic brain injury or during neurodegenerative processes. In a recent short-term study, we have shown that 17β-estradiol (E) and progesterone (P) applied directly after ischemia reduced the infarct volume by more than 70%. This protection might primarily result from the anti-inflammatory effects of steroids. Here, we focus on the long-term neuroprotection by both steroids with respect to the infarct volume, functional recovery, and vessel density in the penumbra. The application of E/P during the first 48h after stroke (transient middle cerebral artery occlusion, tMCAO) revealed neuroprotection after two weeks. The infarct area was reduced by 70% and motor activity was preserved compared to placebo-treated animals. Blood vessel density in the penumbra using immunohistochemistry for von Willebrand factor showed increased vessel density after tMCAO which was not affected by hormones. Expression of vascular endothelial growth factor (VEGF) and its receptor (R1) was increased at 24h after tMCAO and up-regulated by E/P but not changed 14 days after stroke. These findings suggest that the neuroprotective potency of both steroids is sustained and persists for at least two weeks. Besides anti-inflammatory and anti-apoptotic actions, angiogenesis in the damaged area appears to be initially affected early after ischemia and is manifested up to two weeks. This article is part of a Special Issue entitled 'Neurosteroids'.
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Affiliation(s)
- Cordula Ulbrich
- Institute of Neuroanatomy, RWTH Aachen University, Aachen, Germany
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42
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Alzheimer's disease, oestrogen and mitochondria: an ambiguous relationship. Mol Neurobiol 2012; 46:151-60. [PMID: 22678467 PMCID: PMC3443477 DOI: 10.1007/s12035-012-8281-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Accepted: 05/21/2012] [Indexed: 11/02/2022]
Abstract
Hormonal deficit in post-menopausal women has been proposed to be one risk factor in Alzheimer's disease (AD) since two thirds of AD patients are women. However, large treatment trials showed negative effects of long-term treatment with oestrogens in older women. Thus, oestrogen treatment after menopause is still under debate, and several hypotheses trying to explain the failure in outcome are under discussion. Concurrently, it was shown that amyloid-beta (Aβ) peptide, the main constituent of senile plaques, as well as abnormally hyperphosphorylated tau protein, the main component of neurofibrillary tangles, can modulate the level of neurosteroids which notably represent neuroactive steroids synthetized within the nervous system, independently of peripheral endocrine glands. In this review, we summarize the role of neurosteroids especially that of oestrogen in AD and discuss their potentially neuroprotective effects with specific regard to the role of oestrogens on the maintenance and function of mitochondria, important organelles which are highly vulnerable to Aβ- and tau-induced toxicity. We also discuss the role of Aβ-binding alcohol dehydrogenase (ABAD), a mitochondrial enzyme able to bind Aβ peptide thereby modifying mitochondrial function as well as oestradiol levels suggesting possible modes of interaction between the three, and the potential therapeutic implication of inhibiting Aβ-ABAD interaction.
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43
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Ozawa GY, Bearse MA, Bronson-Castain KW, Harrison WW, Schneck ME, Barez S, Adams AJ. Neurodegenerative differences in the retinas of male and female patients with type 2 diabetes. Invest Ophthalmol Vis Sci 2012; 53:3040-6. [PMID: 22491405 DOI: 10.1167/iovs.11-8226] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE The purpose of our study is to determine whether neuroretinal function, measured by the multifocal electroretinogram, differs between males and females with type 2 diabetes and no retinopathy. METHODS This study included 70 eyes from 70 adult subjects (14 control males, 22 control females, 16 males with type 2 diabetes, and 18 females with type 2 diabetes). A template-scaling technique was used to obtain first-order P1 implicit times and N1-P1 amplitudes from photopic multifocal electroretinograms within the central 45 degrees. RESULTS The males with type 2 diabetes were significantly more abnormal than their female counterparts in two separate analyses of local neuroretinal function. First, the total number of retinal locations with an abnormally delayed implicit time (z score ≥ 2) was higher (P < 0.001) in the diabetic males (482 locations = 29.2%) compared to the diabetic females (298 locations = 16.1%). Second, in the response topographies that consisted of 103 means of local implicit times for each group, the diabetic males were significantly delayed (P < 0.025) at 23 corresponding positions (22.3%) compared to the diabetic females. At the same time, no corresponding stimulus locations were significantly delayed in the diabetic females compared to the diabetic males. CONCLUSIONS Neuroretinal function is more abnormal in males than in females for adults with type 2 diabetes and no retinopathy. These results suggest that, relative to males, females may have some protection from, or resistance to, neurodegenerative changes that precede the development of background retinopathy in type 2 diabetes.
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Affiliation(s)
- Glen Y Ozawa
- Berkeley School of Optometry, University of California, Berkeley, California 94720, USA.
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44
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Abstract
BACKGROUND There are subtle differences in the presentation of psychosis that depend on the biological sex of the person exhibiting the symptoms. Because much of the early research in the field was conducted on male animals and on men, several issues of importance to women have been relatively neglected until recently. Current research into psychotic illness is beginning to analyze results for men and women separately and greater emphasis on qualitative methods has allowed the experiences of women patients to be documented. METHODS The last decade of research into the many facets of psychosis in women were reviewed for this paper by introducing the relevant search terms into PubMed, PsycINFO and SOCINDEX. RESULTS Subtle differences are reported in several areas, with important ramifications for treatment. CONCLUSIONS It is important for service providers to devise treatment programs that address the different needs of the two sexes. Effective treatment of women with psychosis is especially important in that these women are often mothers, whose well being impacts on the health of the next generation.
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Affiliation(s)
- Mary V Seeman
- University of Toronto and Centre for Addiction & Mental Health, Toronto, ON, Canada.
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45
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Gong P, Li CS, Hua R, Zhao H, Tang ZR, Mei X, Zhang MY, Cui J. Mild hypothermia attenuates mitochondrial oxidative stress by protecting respiratory enzymes and upregulating MnSOD in a pig model of cardiac arrest. PLoS One 2012; 7:e35313. [PMID: 22532848 PMCID: PMC3332059 DOI: 10.1371/journal.pone.0035313] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Accepted: 03/13/2012] [Indexed: 01/22/2023] Open
Abstract
Mild hypothermia is the only effective treatment confirmed clinically to improve neurological outcomes for comatose patients with cardiac arrest. However, the underlying mechanism is not fully elucidated. In this study, our aim was to determine the effect of mild hypothermia on mitochondrial oxidative stress in the cerebral cortex. We intravascularly induced mild hypothermia (33°C), maintained this temperature for 12 h, and actively rewarmed in the inbred Chinese Wuzhishan minipigs successfully resuscitated after 8 min of untreated ventricular fibrillation. Cerebral samples were collected at 24 and 72 h following return of spontaneous circulation (ROSC). We found that mitochondrial malondialdehyde and protein carbonyl levels were significantly increased in the cerebral cortex in normothermic pigs even at 24 h after ROSC, whereas mild hypothermia attenuated this increase. Moreover, mild hypothermia attenuated the decrease in Complex I and Complex III (i.e., major sites of reactive oxygen species production) activities of the mitochondrial respiratory chain and increased antioxidant enzyme manganese superoxide dismutase (MnSOD) activity. This increase in MnSOD activity was consistent with the upregulation of nuclear factor erythroid 2-related factor 2 (Nrf2) mRNA and protein expressions, and with the increase of Nrf2 nuclear translocation in normothermic pigs at 24 and 72 h following ROSC, whereas mild hypothermia enhanced these tendencies. Thus, our findings indicate that mild hypothermia attenuates mitochondrial oxidative stress in the cerebral cortex, which may be associated with reduced impairment of mitochondrial respiratory chain enzymes, and enhancement of MnSOD activity and expression via Nrf2 activation.
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Affiliation(s)
- Ping Gong
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Chun-Sheng Li
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Rong Hua
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Hong Zhao
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Zi-Ren Tang
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Xue Mei
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Ming-Yue Zhang
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
| | - Juan Cui
- Department of Emergency, Beijing Chaoyang Hospital, Capital Medical University, Beijing, People's Republic of China
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46
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Fiocchetti M, Ascenzi P, Marino M. Neuroprotective effects of 17β-estradiol rely on estrogen receptor membrane initiated signals. Front Physiol 2012; 3:73. [PMID: 22493583 PMCID: PMC3319910 DOI: 10.3389/fphys.2012.00073] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 03/13/2012] [Indexed: 12/15/2022] Open
Abstract
Besides its crucial role in many physiological events, 17β-estradiol (E2) exerts protective effects in the central nervous system. The E2 effects are not restricted to the brain areas related with the control of reproductive function, but rather are widespread throughout the developing and the adult brain. E2 actions are mediated through estrogen receptors (i.e., ERα and ERβ) belonging to the nuclear receptor super-family. As members of the ligand-regulated transcription factor family, classically, the actions of ERs in the brain were thought to mediate only the E2 long-term transcriptional effects. However, a growing body of evidence highlighted rapid, membrane initiated E2 effects in the brain that are independent of ER transcriptional activities and are involved in E2-induced neuroprotection. The aim of this review is to focus on the rapid effects of E2 in the brain highlighting the specific role of the signaling pathway(s) of the ERβ subtype in the neuroprotective actions of E2.
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47
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Davis MC, El-Sayed AM, Ziewacz JE, Jayachandran P, Geisert WC, Zamora-Berridi GJ, Sullivan SE. Sex Disparities in Postoperative Outcomes After Neurosurgical Intervention. Neurosurgery 2012; 70:959-64; discussion 964. [DOI: 10.1227/neu.0b013e31823e9706] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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48
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Saccular-specific hair cell addition correlates with reproductive state-dependent changes in the auditory saccular sensitivity of a vocal fish. J Neurosci 2012; 32:1366-76. [PMID: 22279221 DOI: 10.1523/jneurosci.4928-11.2012] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The plainfin midshipman fish, Porichthys notatus, is a seasonal breeding teleost fish for which vocal-acoustic communication is essential for its reproductive success. Female midshipman use the saccule as the primary end organ for hearing to detect and locate "singing" males that produce multiharmonic advertisement calls during the summer breeding season. Previous work has shown that female auditory sensitivity changes seasonally with reproductive state; summer reproductive females become better suited than winter nonreproductive females to detect and encode the dominant higher harmonic components in the male's advertisement call, which are potentially critical for mate selection and localization. Here, we test the hypothesis that these seasonal changes in female auditory sensitivity are concurrent with seasonal increases in saccular hair cell receptors. We show that there is increased hair cell density in reproductive females and that this increase is not dependent on body size since similar changes in hair cell density were not found in the other inner ear end organs. We also observed an increase in the number of small, potentially immature saccular hair bundles in reproductive females. The seasonal increase in saccular hair cell density and smaller hair bundles in reproductive females was paralleled by a dramatic increase in the magnitude of the evoked saccular potentials and a corresponding decrease in the auditory thresholds recorded from the saccule. This demonstration of correlated seasonal plasticity of hair cell addition and auditory sensitivity may in part facilitate the adaptive auditory plasticity of this species to enhance mate detection and localization during breeding.
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49
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Sex-specific antidepressant effects of dietary creatine with and without sub-acute fluoxetine in rats. Pharmacol Biochem Behav 2012; 101:588-601. [PMID: 22429992 DOI: 10.1016/j.pbb.2012.03.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 03/01/2012] [Accepted: 03/05/2012] [Indexed: 12/14/2022]
Abstract
The potential role of metabolic impairments in the pathophysiology of depression is motivating researchers to evaluate the treatment efficacy of creatine, a naturally occurring energetic and neuroprotective compound found in brain and muscle tissues. Growing evidence is demonstrating the benefit of oral creatine supplements for reducing depressive symptoms in humans and animals. A novel question is whether dietary creatine, when combined with antidepressant drug therapy, would be more effective than either compound alone. To answer this question, four studies were conducted to investigate the behavioral effects of combined creatine and low-dose fluoxetine treatment using the forced swim test in male and female rats. Sprague-Dawley rats were fed powdered rodent chow supplemented with 0%, 2% or 4% w/w creatine monohydrate for 5 weeks. Rats were injected with fluoxetine (5.0 or 10.0 mg/kg) or saline according to a sub-acute dosing schedule. Female rats maintained on a 4% creatine diet displayed antidepressant-like effects compared to non-supplemented females prior to fluoxetine treatment. In contrast, creatine did not alter behavior reliably in males. Following drug treatment and a second forced swim trial, the antidepressant-like profile of creatine remained significant only in females co-administered 5.0 mg/kg fluoxetine. Moreover, in females only, supplementation with 4% creatine produced a more robust antidepressant-like behavioral profile compared to either dose of fluoxetine alone. Estrous cycle data indicated that ovarian hormones influenced the antidepressant-like effects of creatine. Addressing the issue of sex differences in response to treatment may affect our understanding of creatine, its relationship with depressive behavior, and may lead to sex-specific therapeutic strategies.
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50
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Kipp M, Berger K, Clarner T, Dang J, Beyer C. Sex steroids control neuroinflammatory processes in the brain: relevance for acute ischaemia and degenerative demyelination. J Neuroendocrinol 2012; 24:62-70. [PMID: 21592237 DOI: 10.1111/j.1365-2826.2011.02163.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Sex steroids have been demonstrated as powerful compounds to protect neurones and neural tissue from neurotoxic challenges and during neurodegeneration. A multitude of cellular actions have been attributed to female gonadal steroid hormones, including the regulation of pro-survival and anti-apoptotic factors, bioenergetic demands and radical elimination, growth factor allocation and counteracting against excitotoxicity. In recent years, immune-modulatory and anti-inflammatory characteristics of oestrogen and progesterone have also come under scrutiny. To date, each of these physiological responses has been considered to be partially and selectively integrated in the mediation of steroid-mediated cell protection and tested in suitable animal models and in vitro systems. To what extent these individual effects contribute to the overall neural protection remains sketchy. One idea is that a battery of cellular mechanisms operates at the same time. On the other hand, interactions and the control of the brain-intrinsic and peripheral immune system may play an additional and perhaps pioneering function in this scenario, notwithstanding the importance of secondary adjuvant mechanisms. In the present review, we highlight neuroprotective effects of oestrogen and progesterone in two different disease models of the brain, namely acute ischaemic and demyelination damage, which represent the most common acute and degenerative neurological disorders in humans. Besides other inflammatory parameters, we discuss the idea that chemokine expression and signalling appear to be early hallmarks in both diseases and are positively affected by sex steroids. In addition, the complex interplay with local brain-resident immune-competent cells appears to be controlled by the steroid environment.
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Affiliation(s)
- M Kipp
- Institute of Neuroanatomy, RWTH Aachen University, Aachen, Germany
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