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Bendis PC, Zimmerman S, Onisiforou A, Zanos P, Georgiou P. The impact of estradiol on serotonin, glutamate, and dopamine systems. Front Neurosci 2024; 18:1348551. [PMID: 38586193 PMCID: PMC10998471 DOI: 10.3389/fnins.2024.1348551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Accepted: 02/22/2024] [Indexed: 04/09/2024] Open
Abstract
Estradiol, the most potent and prevalent member of the estrogen class of steroid hormones and is expressed in both sexes. Functioning as a neuroactive steroid, it plays a crucial role in modulating neurotransmitter systems affecting neuronal circuits and brain functions including learning and memory, reward and sexual behaviors. These neurotransmitter systems encompass the serotonergic, dopaminergic, and glutamatergic signaling pathways. Consequently, this review examines the pivotal role of estradiol and its receptors in the regulation of these neurotransmitter systems in the brain. Through a comprehensive analysis of current literature, we investigate the multifaceted effects of estradiol on key neurotransmitter signaling systems, namely serotonin, dopamine, and glutamate. Findings from rodent models illuminate the impact of hormone manipulations, such as gonadectomy, on the regulation of neuronal brain circuits, providing valuable insights into the connection between hormonal fluctuations and neurotransmitter regulation. Estradiol exerts its effects by binding to three estrogen receptors: estrogen receptor alpha (ERα), estrogen receptor beta (ERβ), and G protein-coupled receptor (GPER). Thus, this review explores the promising outcomes observed with estradiol and estrogen receptor agonists administration in both gonadectomized and/or genetically knockout rodents, suggesting potential therapeutic avenues. Despite limited human studies on this topic, the findings underscore the significance of translational research in bridging the gap between preclinical findings and clinical applications. This approach offers valuable insights into the complex relationship between estradiol and neurotransmitter systems. The integration of evidence from neurotransmitter systems and receptor-specific effects not only enhances our understanding of the neurobiological basis of physiological brain functioning but also provides a comprehensive framework for the understanding of possible pathophysiological mechanisms resulting to disease states. By unraveling the complexities of estradiol's impact on neurotransmitter regulation, this review contributes to advancing the field and lays the groundwork for future research aimed at refining understanding of the relationship between estradiol and neuronal circuits as well as their involvement in brain disorders.
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Affiliation(s)
- Peyton Christine Bendis
- Psychoneuroendocrinology Laboratory, Department of Psychology, University of Wisconsin Milwaukee, Milwaukee, WI, United States
| | - Sydney Zimmerman
- Psychoneuroendocrinology Laboratory, Department of Psychology, University of Wisconsin Milwaukee, Milwaukee, WI, United States
| | - Anna Onisiforou
- Translational Neuropharmacology Laboratory, Department of Psychology, University of Cyprus, Nicosia, Cyprus
| | - Panos Zanos
- Translational Neuropharmacology Laboratory, Department of Psychology, University of Cyprus, Nicosia, Cyprus
| | - Polymnia Georgiou
- Psychoneuroendocrinology Laboratory, Department of Psychology, University of Wisconsin Milwaukee, Milwaukee, WI, United States
- Laboratory of Epigenetics and Gene Regulation, Department of Biological Sciences, University of Cyprus, Nicosia, Cyprus
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Gharat R, Dixit G, Khambete M, Prabhu A. Targets, trials and tribulations in Alzheimer therapeutics. Eur J Pharmacol 2024; 962:176230. [PMID: 38042464 DOI: 10.1016/j.ejphar.2023.176230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 11/25/2023] [Accepted: 11/27/2023] [Indexed: 12/04/2023]
Abstract
Alzheimer's disease (AD) is a progressive neurodegenerative disorder characterized by abnormal accumulation of extracellular amyloid beta senile plaques and intracellular neurofibrillary tangles in the parts of the brain responsible for cognition. The therapeutic burden for the management of AD relies solely on cholinesterase inhibitors that provide only symptomatic relief. The urgent need for disease-modifying drugs has resulted in intensive research in this domain, which has led to better understanding of the disease pathology and identification of a plethora of new pathological targets. Currently, there are over a hundred and seventy clinical trials exploring disease modification, cognitive enhancement, and reduction of neuro-psychiatric complications. However, the path to developing safe and efficacious AD therapeutics has not been without challenges. Several clinical trials have been terminated in advanced stages due to lack of therapeutic translation or increased incidence of adverse events. This review presents an in-depth look at the various therapeutic targets of AD and the lessons learnt during their clinical assessment. Comprehensive understanding of the implication of modulating various aspects of Alzheimer brain pathology is crucial for development of drugs with potential to halt disease progression in Alzheimer therapeutics.
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Affiliation(s)
- Ruchita Gharat
- SVKM's Dr. Bhanuben Nanavati College of Pharmacy, VM Road, Vile Parle (West), Mumbai, 400056, Maharashtra, India
| | - Gargi Dixit
- SVKM's Dr. Bhanuben Nanavati College of Pharmacy, VM Road, Vile Parle (West), Mumbai, 400056, Maharashtra, India
| | - Mihir Khambete
- Department of Chemistry, Yale University, New Haven, CT, USA
| | - Arati Prabhu
- SVKM's Dr. Bhanuben Nanavati College of Pharmacy, VM Road, Vile Parle (West), Mumbai, 400056, Maharashtra, India.
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Vega-Rivera NM, González-Trujano ME, Luna-Angula A, Sánchez-Chapul L, Estrada-Camarena E. Antidepressant-like effects of the Punica granatum and citalopram combination are associated with structural changes in dendritic spines of granule cells in the dentate gyrus of rats. Front Pharmacol 2023; 14:1211663. [PMID: 37900157 PMCID: PMC10613096 DOI: 10.3389/fphar.2023.1211663] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/31/2023] [Indexed: 10/31/2023] Open
Abstract
Introduction: Natural products such as phytoestrogens-enriched foods or supplements have been considered as an alternative therapy to reduce depressive symptoms associated with menopause. It is known that the aqueous extract of Punica granatum (AE-PG) exerts antidepressant-like effects by activating β-estrogen receptors and facilitates the antidepressant response of the clinical drug citalopram (CIT). However, the effects on neuroplasticity are unknown. Objectvie investigated the antidepressant-like response of combining AE-PG and CIT at sub-optimal doses, analyzing their effects on the formation and maturation of dendrite spines in granule cells as well as on the dendrite complexity. Methods: Ovariectomized Wistar rats (3-month-old) were randomly assigned to one of the following groups: A) control (saline solution as vehicle of CIT and AE-PG, B) AE-PG at a sub-threshold dose (vehicle of CIT plus AE-PG at 0.125 mg/kg), C) CIT at a sub-threshold dose (0.77 mg/kg plus vehicle of AE-PG), and D) a combination of CIT plus AE-PG (0.125 mg/kg and 0.77 mg/kg, respectively). All rats were treated intraperitoneally for 14 days. Antidepressant-like effects were evaluated using the force swimming test test (FST). The complexity of dendrites and the number and morphology of dendrite spines of neurons were assessed in the dentate gyrus after Golgi-Cox impregnation. The expressions of the mature brain-derived neurotrophic factor (mBDNF) in plasma and of mBDNF and synaptophysin in the hippocampus, as markers of synaptogenesis, were also determined. Results: Administration of CIT combined with AE-PG, but not alone, induced a significant antidepressant-like effect in the FST with an increase in the dendritic complexity and the number of dendritic spines in the dentate gyrus (DG) of the hippocampus, revealed by the thin and stubby categories of neurons at the granular cell layer. At the same time, an increase of mBDNF and synaptophysin expression was observed in the hippocampus of rats that received the combination of AE-PG and CIT.
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Affiliation(s)
- Nelly-Maritza Vega-Rivera
- Laboratorio de Neuropsicofarmacología, Dirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría “Ramón de la Fuente Muñiz”, Mexico City, Mexico
| | - María Eva González-Trujano
- Laboratorio de Neurofarmacología de Productos Naturales, Dirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, Mexico City, Mexico
| | - Alexandra Luna-Angula
- Laboratorio de Enfermedades Neuromusculares, División de Neurociencias Clínicas, Instituto Nacional de Rehabilitación “Luis Guillermo Ibarra Ibarra”, Mexico City, Mexico
| | - Laura Sánchez-Chapul
- Laboratorio de Enfermedades Neuromusculares, División de Neurociencias Clínicas, Instituto Nacional de Rehabilitación “Luis Guillermo Ibarra Ibarra”, Mexico City, Mexico
| | - Erika Estrada-Camarena
- Laboratorio de Neuropsicofarmacología, Dirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría “Ramón de la Fuente Muñiz”, Mexico City, Mexico
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El-Bana MA, El-Daly SM, Omara EA, Morsy SM, El-Naggar ME, Medhat D. Preparation of pumpkin oil-based nanoemulsion as a potential estrogen replacement therapy to alleviate neural-immune interactions in an experimental postmenopausal model. Prostaglandins Other Lipid Mediat 2023; 166:106730. [PMID: 36931593 DOI: 10.1016/j.prostaglandins.2023.106730] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/26/2023] [Accepted: 03/10/2023] [Indexed: 03/17/2023]
Abstract
As estrogen production decreases during menopause; the brain's metabolism tends to stall and become less effective. Estrogen most likely protects against neurodegeneration. Consequently, a comprehensive study of the benefits of hormone replacement therapy as a neuroprotective effect is urgently required. This study was designed to fabricate pumpkin seed oil nanoparticles (PSO) in nanoemulsion form (PSO-NE) and investigate their potential role in attenuating the neural-immune interactions in an experimental postmenopausal model.Sixty female white albino rats were divided into six groups: control, sham, ovariectomized (OVX), and three OVX groups treated with 17β-estradiol, PSO, and PSO-NE respectively. Transmission Electron Microscopy (TEM), and particle size analyzer were performed for nanoemulsion evaluation. Serum levels of estrogen, brain amyloid precursor protein (APP), serum levels of nuclear factor kappa B (NF-κβ), interleukin 6 (IL-6), transthyretin (TTR), and synaptophysin (SYP) were evaluated. The expression of estrogen receptors (ER-α, β) in the brain tissue was estimated. The findings revealed that the approached PSO-NE system was able to reduce the interfacial tension, enhance the dispersion entropy, lower the system free energy to an extremely small value, and augment the interfacial area. PSO-NE, showed a significant increase in the levels of estrogen, brain APP, SYP, and TTR accompanied with a significant increased in the expression of brain ER-α, β compared to the OVX group. In conclusion, the phytoestrogen content of PSO exhibited a significant prophylactic effect on neuro-inflammatory interactions, ameliorating both estrogen levels and the inflammatory cascades.
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Affiliation(s)
- Mona A El-Bana
- Medical Biochemistry Department, Medical Research and Clinical Studies Institute National Research Centre, Dokki, Giza, Egypt
| | - Sherien M El-Daly
- Medical Biochemistry Department, Medical Research and Clinical Studies Institute National Research Centre, Dokki, Giza, Egypt; Cancer Biology and Genetics Laboratory, Centre of Excellence for Advanced Sciences, National Research Centre, Dokki, Giza, Egypt
| | - Enayat A Omara
- Pathology Department, Medical Research and Clinical Studies Institute, National Research Centre, Dokki, Giza, Egypt
| | - Safaa M Morsy
- Medical Biochemistry Department, Medical Research and Clinical Studies Institute National Research Centre, Dokki, Giza, Egypt
| | - Mehrez E El-Naggar
- Institute of Textile Research and Technology, National Research Centre, Dokki, Giza, Egypt
| | - Dalia Medhat
- Medical Biochemistry Department, Medical Research and Clinical Studies Institute National Research Centre, Dokki, Giza, Egypt.
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Galvano E, Pandit H, Sepulveda J, Ng CAS, Becher MK, Mandelblatt JS, Van Dyk K, Rebeck GW. Behavioral and transcriptomic effects of the cancer treatment tamoxifen in mice. Front Neurosci 2023; 17:1068334. [PMID: 36845433 PMCID: PMC9951777 DOI: 10.3389/fnins.2023.1068334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 01/24/2023] [Indexed: 02/12/2023] Open
Abstract
Introduction Tamoxifen is a common treatment for estrogen receptor-positive breast cancer. While tamoxifen treatment is generally accepted as safe, there are concerns about adverse effects on cognition. Methods We used a mouse model of chronic tamoxifen exposure to examine the effects of tamoxifen on the brain. Female C57/BL6 mice were exposed to tamoxifen or vehicle control for six weeks; brains of 15 mice were analyzed for tamoxifen levels and transcriptomic changes, and an additional 32 mice were analyzed through a battery of behavioral tests. Results Tamoxifen and its metabolite 4-OH-tamoxifen were found at higher levels in the brain than in the plasma, demonstrating the facile entry of tamoxifen into the CNS. Behaviorally, tamoxifen-exposed mice showed no impairment in assays related to general health, exploration, motor function, sensorimotor gating, and spatial learning. Tamoxifen-treated mice showed a significantly increased freezing response in a fear conditioning paradigm, but no effects on anxiety measures in the absence of stressors. RNA sequencing analysis of whole hippocampi showed tamoxifen-induced reductions in gene pathways related to microtubule function, synapse regulation, and neurogenesis. Discussion These findings of the effects of tamoxifen exposure on fear conditioning and on gene expression related to neuronal connectivity suggest that there may be CNS side effects of this common breast cancer treatment.
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Affiliation(s)
- Elena Galvano
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC, United States
| | - Harshul Pandit
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC, United States
| | - Jordy Sepulveda
- Department of Pharmacology and Physiology, Georgetown University Medical Center, Washington, DC, United States
| | - Christi Anne S. Ng
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC, United States
| | - Melanie K. Becher
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC, United States
| | - Jeanne S. Mandelblatt
- Department of Oncology, Georgetown Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, United States
| | - Kathleen Van Dyk
- Department of Psychiatry, UCLA Semel Institute for Neuroscience and Human Behavior, Los Angeles, CA, United States
| | - G. William Rebeck
- Department of Neuroscience, Georgetown University Medical Center, Washington, DC, United States
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Champarini LG, Herrera ML, Comas Mutis RG, Espejo PJ, Molina VA, Calfa GD, Hereñú CB. Effect of intra-BLA overexpression of IGF-1 on the expression of a contextual fear memory trace. Hippocampus 2022; 32:765-775. [PMID: 36000813 DOI: 10.1002/hipo.23465] [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: 11/05/2021] [Revised: 08/04/2022] [Accepted: 08/08/2022] [Indexed: 11/08/2022]
Abstract
Growth factors, such as insulin-like growth factor 1 (IGF-1), among others are known for their critical involvement in learning and memory processes. IGF-1 regulates cognitive functions, synapse density, neurotransmission, and adult neurogenesis and induces structural and synaptic plasticity-specific changes. Although IGF-1 has been suggested to participate in different memory processes, its role in memories associated with negative emotional experiences still remains to be elucidated. The principal aim of the present study was to test whether IGF-1 overexpression using adenoviral vectors in basolateral amygdala (BLA) influences both the expression and formation of contextual fear memory, as well as the hippocampal structural plasticity associated with such memory trace. We found that IGF-1 overexpression promotes the formation and expression of a specific contextual fear memory trace, and such effect persisted at least 7 days after recall. Moreover, the overexpression of this growth factor in BLA upregulates the activation of the ERK/MAPK pathway in this brain structure. In addition, intra-BLA IGF-1 overexpression causes dorsal hippocampus (DH) structural plasticity modifications promoting changes in the proportion of mature dendritic spines in the CA1 region, after a weak conditioning protocol. The present findings contribute to the knowledge underlying BLA-DH trace memory of fear and reveal important new insights into the neurobiology and neurochemistry of fear acquisition modulated by IGF-1 overexpression. The understanding of how IGF-1 modulates the formation of a fear contextual trace may pave the way for the development of novel therapeutic strategies focused on fear, anxiety, and trauma-related disorders.
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Affiliation(s)
- Leandro Gabriel Champarini
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
| | - Macarena Lorena Herrera
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
| | - Ramiro Gabriel Comas Mutis
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
| | - Pablo Javier Espejo
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
| | - Victor Alejandro Molina
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
| | - Gastón Diego Calfa
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
| | - Claudia Beatriz Hereñú
- Departamento de Farmacología, Instituto de Farmacología Experimental de Córdoba (IFEC-CONICET), Universidad Nacional de Córdoba, Cordoba, Argentina
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Najar J, Hällström T, Zettergren A, Johansson L, Joas E, Fässberg MM, Zetterberg H, Blennow K, Kern S, Skoog I. Reproductive period and preclinical cerebrospinal fluid markers for Alzheimer disease: a 25-year study. Menopause 2021; 28:1099-1107. [PMID: 34225325 PMCID: PMC8462446 DOI: 10.1097/gme.0000000000001816] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 05/13/2021] [Accepted: 05/13/2021] [Indexed: 11/25/2022]
Abstract
OBJECTIVE The aim of the study was to examine the association between reproductive period, as an indicator of endogenous estrogen, and levels of cerebrospinal fluid (CSF) biomarkers for Alzheimer disease (AD). METHODS A population-based sample of women from Gothenburg, Sweden was followed from 1968 to 1994 (N = 75). All women had natural menopause and were free from dementia. Information on reproductive period (age at menarche to age at menopause) was obtained from interviews from 1968 to 1980. Lumbar puncture was performed from 1992 to 1994 and CSF levels of Aβ42, Aβ40, P-tau, and T-tau were measured with immunochemical methods. Linear regression models adjusted for potential confounders were used to analyze the relationship between reproductive period and CSF biomarkers for AD. RESULTS Longer reproductive period was associated with lower levels of Aβ42 (β = -19.2, P = 0.01), higher levels of P-tau (β = 0.03, P = 0.01), and lower ratio of Aβ42/Aβ40 (β = -0.02, P = 0.01), while no association was observed for T-tau (β = 0.01, P = 0.46). In separate analyses, examining the different components of reproductive period, earlier age at menarche was associated higher levels of P-tau (β = -0.07, P = 0.031) and lower ratio of Aβ42/Aβ40 (β = 0.05, P = 0.021), whereas no association was observed with Aβ42 (β = 31.1, P = 0.11) and T-tau (β = -0.001, P = 0.98). Furthermore, no association was observed between age at menopause and CSF biomarkers for AD. CONCLUSIONS Our findings suggest that longer exposure to endogenous estrogen may be associated with increased levels of AD biomarkers in the preclinical phase of AD. These findings, however, need to be confirmed in larger samples.
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Affiliation(s)
- Jenna Najar
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
- Region Västra Götaland, Sahlgrenska University Hospital, Psychiatry, Cognition and Old Age Psychiatry Clinic, Gothenburg, Sweden
| | - Tore Hällström
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
| | - Anna Zettergren
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
| | - Lena Johansson
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
| | - Erik Joas
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
| | - Madeleine Mellqvist Fässberg
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
| | - Henrik Zetterberg
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
- Department of Neurodegenerative Disease, UCL Institute of Neurology, London, United Kingdom
- UK Dementia Research Institute at UCL, London, United Kingdom
| | - Kaj Blennow
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Silke Kern
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
- Region Västra Götaland, Sahlgrenska University Hospital, Psychiatry, Cognition and Old Age Psychiatry Clinic, Gothenburg, Sweden
| | - Ingmar Skoog
- Neuropsychiatric Epidemiology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, Centre for Ageing and Health (AGECAP) at the University of Gothenburg, Mölndal, Sweden
- Region Västra Götaland, Sahlgrenska University Hospital, Psychiatry, Cognition and Old Age Psychiatry Clinic, Gothenburg, Sweden
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Comas Mutis R, Espejo PJ, Martijena ID, Molina VA, Calfa GD. Temporal dynamic of the hippocampal structural plasticity associated with the fear memory destabilization/reconsolidation process. Hippocampus 2021; 31:1080-1091. [PMID: 34190369 DOI: 10.1002/hipo.23374] [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: 01/27/2021] [Revised: 05/17/2021] [Accepted: 06/06/2021] [Indexed: 11/11/2022]
Abstract
Reconsolidation of a contextual fear memory is a protein synthesis-dependent process in which a previously destabilized memory returns to a stable state. This process has become the subject of many studies due to its importance in memory processing, maintenance and updating, and its potential role as a therapeutical target in fear memory disorders such as phobias and post-traumatic stress disorder. In this sense, understanding the underlying mechanisms of memory reconsolidation is paramount in developing potential treatments for such memory dysfunctions. In the present work, we studied the interaction between two key neural structures involved in the reconsolidation process: the basolateral amygdala complex of the amygdala (BLA) and the dorsal hippocampus (DH). Our results show changes in the structural plasticity of the CA1 region of the DH in the form of dendritic spines density changes associated with the destabilization/reconsolidation process. Furthermore, we demonstrate a modulatory role of BLA over such structural plasticity by infusing different drugs such as ifenprodil, a destabilization blocker, and propranolol, a reconsolidation disruptor, in this brain structure. Altogether our work shows a particular temporal dynamic in the CA1 region of DH that accompanies the destabilization/reconsolidation process and aims to provide new information on the underlying mechanisms of this process that potentially contributes for a better understanding of memory storage, maintenance, expression and updating, and its potential medical applications.
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Affiliation(s)
- Ramiro Comas Mutis
- IFEC-CONICET, Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, Córdoba, Argentina
| | - Pablo Javier Espejo
- IFEC-CONICET, Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, Córdoba, Argentina
| | - Irene Delia Martijena
- IFEC-CONICET, Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, Córdoba, Argentina
| | - Victor Alejandro Molina
- IFEC-CONICET, Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, Córdoba, Argentina
| | - Gastón Diego Calfa
- IFEC-CONICET, Departamento de Farmacología, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, Córdoba, Argentina
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9
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Ashraf GM, Ebada MA, Suhail M, Ali A, Uddin MS, Bilgrami AL, Perveen A, Husain A, Tarique M, Hafeez A, Alexiou A, Ahmad A, Kumar R, Banu N, Najda A, Sayed AA, Albadrani GM, Abdel-Daim MM, Peluso I, Barreto GE. Dissecting Sex-Related Cognition between Alzheimer's Disease and Diabetes: From Molecular Mechanisms to Potential Therapeutic Strategies. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:4572471. [PMID: 33747345 PMCID: PMC7960032 DOI: 10.1155/2021/4572471] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 01/31/2021] [Accepted: 02/11/2021] [Indexed: 12/16/2022]
Abstract
The brain is a sexually dimorphic organ that implies different functions and structures depending on sex. Current pharmacological approaches against different neurological diseases act distinctly in male and female brains. In all neurodegenerative diseases, including Alzheimer's disease (AD), sex-related outcomes regarding pathogenesis, prevalence, and response to treatments indicate that sex differences are important for precise diagnosis and therapeutic strategy. Pathogenesis of AD includes vascular dementia, and in most cases, this is accompanied by metabolic complications with similar features as those assembled in diabetes. This review discusses how AD-associated dementia and diabetes affect cognition in relation to sex difference, as both diseases share similar pathological mechanisms. We highlight potential protective strategies to mitigate amyloid-beta (Aβ) pathogenesis, emphasizing how these drugs act in the male and female brains.
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Affiliation(s)
- Ghulam Md Ashraf
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mahmoud Ahmed Ebada
- Faculty of Medicine, Zagazig University, Zagazig, El-Sharkia, Egypt
- National Hepatology and Tropical Medicine Research Institute, Cairo, Egypt
| | - Mohd Suhail
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia
- Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ashraf Ali
- Department of Sciences of Agriculture, Food, Natural Resources, and Engineering (DAFNE), University of Foggia, Via Napoli 25, 71122 Foggia, Italy
| | - Md. Sahab Uddin
- Department of Pharmacy, Southeast University, Dhaka, Bangladesh
- Pharmakon Neuroscience Research Network, Dhaka, Bangladesh
| | - Anwar L. Bilgrami
- Department of Entomology, Rutgers University, New Brunswick, NJ 018901, USA
- Deanship of Scientific Research, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Asma Perveen
- Glocal School of Life Sciences, Glocal University, Saharanpur, India
| | - Amjad Husain
- Glocal School of Life Sciences, Glocal University, Saharanpur, India
- Centre for Science and Society, IISER Bhopal, India
- Innovation and Incubation Centre for Entrepreneurship, IISER Bhopal, India
| | - Mohd Tarique
- Department of Child Health, University of Missouri, Columbia, MO 65201, USA
| | - Abdul Hafeez
- Glocal School of Pharmacy, Glocal University, Saharanpur, India
| | - Athanasios Alexiou
- Novel Global Community Educational Foundation, New South Wales, Australia
- AFNP Med Austria, Wien, Austria
| | - Ausaf Ahmad
- Amity Institute of Biotechnology, Amity University Uttar Pradesh Lucknow Campus, Uttar Pradesh, India
| | - Rajnish Kumar
- Amity Institute of Biotechnology, Amity University Uttar Pradesh Lucknow Campus, Uttar Pradesh, India
| | - Naheed Banu
- Department of Physical Therapy, College of Medical Rehabilitation, Qassim University, Buraidah, Qassim, Saudi Arabia
| | - Agnieszka Najda
- Laboratory of Quality of Vegetables and Medicinal Plants, Department of Vegetable Crops and Medicinal Plants, University of Life Sciences in Lublin, 15 Akademicka Street, 20-950 Lublin, Poland
| | - Amany A. Sayed
- Zoology Department, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - Ghadeer M. Albadrani
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11474, Saudi Arabia
| | - Mohamed M. Abdel-Daim
- Pharmacology Department, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt
| | - Ilaria Peluso
- Research Centre for Food and Nutrition, Council for Agricultural Research and Economics (CREA-AN), 00142 Rome, Italy
| | - George E. Barreto
- Department of Biological Sciences, University of Limerick, Limerick, Ireland
- Health Research Institute, University of Limerick, Limerick, Ireland
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10
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Prado RCR, Silveira R, Kilpatrick MW, Pires FO, Asano RY. Menstrual Cycle, Psychological Responses, and Adherence to Physical Exercise: Viewpoint of a Possible Barrier. Front Psychol 2021; 12:525943. [PMID: 33679501 PMCID: PMC7929979 DOI: 10.3389/fpsyg.2021.525943] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 01/12/2021] [Indexed: 11/29/2022] Open
Affiliation(s)
- Raul Cosme Ramos Prado
- Women's Science Studies and Research Academy, São Paulo, Brazil.,Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Rodrigo Silveira
- School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil
| | | | - Flávio Oliveira Pires
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
| | - Ricardo Yukio Asano
- Exercise Psychophysiology Research Group, School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Brazil
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11
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Tozzi A, Bellingacci L, Pettorossi VE. Rapid Estrogenic and Androgenic Neurosteroids Effects in the Induction of Long-Term Synaptic Changes: Implication for Early Memory Formation. Front Neurosci 2020; 14:572511. [PMID: 33192257 PMCID: PMC7653679 DOI: 10.3389/fnins.2020.572511] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 08/21/2020] [Indexed: 11/17/2022] Open
Abstract
Mounting experimental evidence demonstrate that sex neuroactive steroids (neurosteroids) are essential for memory formation. Neurosteroids have a profound impact on the function and structure of neural circuits and their local synthesis is necessary for the induction of both long-term potentiation (LTP) and long-term depression (LTD) of synaptic transmission and for neural spine formation in different areas of the central nervous system (CNS). Several studies demonstrated that in the hippocampus, 17β-estradiol (E2) is necessary for inducing LTP, while 5α-dihydrotestosterone (DHT) is necessary for inducing LTD. This contribution has been proven by administering sex neurosteroids in rodent models and by using blocking agents of their synthesis or of their specific receptors. The general opposite role of sex neurosteroids in synaptic plasticity appears to be dependent on their different local availability in response to low or high frequency of synaptic stimulation, allowing the induction of bidirectional synaptic plasticity. The relevant contribution of these neurosteroids to synaptic plasticity has also been described in other brain regions involved in memory processes such as motor learning, as in the case of the vestibular nuclei, the cerebellum, and the basal ganglia, or as the emotional circuit of the amygdala. The rapid effects of sex neurosteroids on neural synaptic plasticity need the maintenance of a tonic or phasic local steroid synthesis determined by neural activity but might also be influenced by circulating hormones, age, and gender. To disclose the exact mechanisms how sex neurosteroids participate in finely tuning long-term synaptic changes and spine remodeling, further investigation is required.
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Affiliation(s)
- Alessandro Tozzi
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
| | - Laura Bellingacci
- Department of Experimental Medicine, University of Perugia, Perugia, Italy
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12
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Marbouti L, Zahmatkesh M, Riahi E, Sadr SS. Inhibition of brain 17β-estradiol synthesis by letrozole induces cognitive decline in male and female rats. Neurobiol Learn Mem 2020; 175:107300. [PMID: 32882397 DOI: 10.1016/j.nlm.2020.107300] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 08/17/2020] [Accepted: 08/24/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Hippocampal aromatase is responsible for local synthesis of 17β-estradiol (E2) that has much higher concentrations than serum levels in males and females. Letrozole, an aromatase inhibitor, passes through the brain barriers, distributes to the brain, and affects local E2 synthesis. Here, the effects of intra-cerebroventricular (ICV) letrozole administration in the presence and absence of gonads were examined on the cognitive abilities of male and female rats. METHOD Animals received intra-ICV injection of letrozole or vehicle for 14 consecutive days. Spatial working memory, novel object recognition memory, and anxiety-related behavior, were evaluated using Y-maze, object recognition test, and elevated plus maze, respectively. The E2 levels in the serum and hippocampal tissue were measured by the ELISA technique. RT-PCR was performed to assess the hippocampal estrogen receptors (ER) expression. Moreover, letrozole effect on neuronal activity of CA1 pyramidal neurons was studied by in vivo single-unit recording. RESULTS Letrozole (0.2, 0.4, and 0.8 µg) significantly decreased the hippocampal E2 levels compared to the vehicle group. Letrozole caused cognitive impairments in a dose-dependent manner in male and female rats in the presence or absence of gonads. Dose-response analysis revealed that the minimum effective dose of letrozole on the behavioral measures was 0.4 μg. Letrozole also caused an up-regulation of ERα and ERβ and a down-regulation of GPR30 gene expression. The firing rate of pyramidal neurons was reduced by letrozole in gonadal-intact animals. CONCLUSION The detrimental effects of letrozole treatment on cognitive abilities in the presence and absence of gonads indicate that local E2 synthesis in the hippocampus is a crucial factor in normal cognitive performance. The suppressive effect of letrozole on hippocampal neuronal firing might alter synaptic plasticity that is critical for memory formation. These data potentially suggest that memory deficits following letrozole administration should be monitored.
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Affiliation(s)
- Ladan Marbouti
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran; Neuroscience and Addiction Studies Department, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Zahmatkesh
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran; Neuroscience and Addiction Studies Department, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran; Cognitive and Behavioral Sciences Research Center, Tehran University of Medical Sciences, Tehran, Iran.
| | - Esmail Riahi
- Physiology Department, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyed Shahabeddin Sadr
- Electrophysiology Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran; Physiology Department, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
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13
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Lee SH, Byun MS, Lee JH, Yi D, Sohn BK, Lee JY, Kim YK, Shin SA, Sohn CH, Lee DY. Sex-Specific Association of Lifetime Body Mass Index with Alzheimer's Disease Neuroimaging Biomarkers. J Alzheimers Dis 2020; 75:767-777. [PMID: 32333586 PMCID: PMC7369081 DOI: 10.3233/jad-191216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Background: Although recent studies indicate that the relationship between body mass index (BMI) and Alzheimer’s disease (AD) may differ by both sex and age of BMI measurement, little information is available on sex- or age-specific associations between BMI and AD neuropathologies. Objective: To examined whether sex-specific BMIs measured at different life-stages (in early adulthood, midlife, and late life) were associated with cerebral amyloid-β (Aβ) deposition and AD-signature region cortical thickness (AD-CT) in cognitively normal (CN) older adults. Methods: A total of 212 CN subjects aged 60–90 years (females 108, males 104), who participated in the Korean Brain Aging Study for Early Diagnosis and Prediction of Alzheimer’s Disease (KBASE), an ongoing prospective cohort study, were included. All participants underwent comprehensive clinical and neuropsychological assessments, [11C] Pittsburgh Compound B positron emission tomography, and brain magnetic resonance imaging. BMIs at different life stages were calculated. Multiple regression analyses were performed separately for either sex. Results: In males, lower early adulthood or midlife BMI was associated with greater cerebral Aβ deposition, but late life BMI was not. Lower midlife BMI was associated with reduced AD-CT, but the BMI in early adulthood and late life was not. In females, no significant association was observed between any lifetime BMI and Aβ deposition or AD-CT. Conclusion: Our results support a male-specific association between BMI prior to late life, and in vivo AD pathologies. Avoiding underweight status early in life may be important to prevent AD dementia in males, but not females.
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Affiliation(s)
- Seung Hoon Lee
- Department of Neuropsychiatry, Bucheon Geriatric Medical Center, Republic of Korea
| | - Min Soo Byun
- Department of Neuropsychiatry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Jun Ho Lee
- Department of Psychiatry, National Center for Mental Health, Seoul, Republic of Korea
| | - Dahyun Yi
- Institute of Human Behavioral Medicine, Medical Research Center, Seoul National University, Seoul, Republic of Korea
| | - Bo Kyung Sohn
- Department of Neuropsychiatry, Inje University Sanggye Paik Hospital , Seoul, Republic of Korea
| | - Jun-Young Lee
- Department of Neuropsychiatry, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea.,Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yu Kyeong Kim
- Department of Nuclear Medicine, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea
| | - Seong A Shin
- Department of Nuclear Medicine, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea
| | - Chul-Ho Sohn
- Department of Radiology, Seoul National University Hospital, Seoul, Republic of Korea
| | - Dong Young Lee
- Institute of Human Behavioral Medicine, Medical Research Center, Seoul National University, Seoul, Republic of Korea.,Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Neuropsychiatry, Seoul National University Hospital, Seoul, Republic of Korea
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14
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Finney CA, Shvetcov A, Westbrook RF, Jones NM, Morris MJ. The role of hippocampal estradiol in synaptic plasticity and memory: A systematic review. Front Neuroendocrinol 2020; 56:100818. [PMID: 31843506 DOI: 10.1016/j.yfrne.2019.100818] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 11/29/2019] [Accepted: 12/11/2019] [Indexed: 12/31/2022]
Abstract
The consolidation of long-term memory is influenced by various neuromodulators. One of these is estradiol, a steroid hormone that is synthesized both in peripheral endocrine tissue and in the brain, including the hippocampus. Here, we examine the evidence regarding the role of estradiol in the hippocampus, specifically, in memory formation and its effects on the molecular mechanisms underlying synaptic plasticity. We conclude that estradiol improves memory consolidation and, thereby, long-term memory. Previous studies have shown that it does this in three, interconnected ways: (1) via functional changes in excitatory activity, (2) signaling changes in calcium dynamics, protein phosphorylation and protein expression, and (3) structural changes to synaptic morphology. Through a functional network analysis of proteins affected by estradiol, we identify potential protein-protein interactions that further support a role for estradiol in modulating synaptic plasticity as well as highlight signaling pathways that may be involved in these changes within the hippocampus.
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Affiliation(s)
- C A Finney
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
| | - A Shvetcov
- School of Psychology, University of New South Wales, Sydney, NSW, Australia
| | - R F Westbrook
- School of Psychology, University of New South Wales, Sydney, NSW, Australia
| | - N M Jones
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
| | - M J Morris
- School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia.
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15
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Tsutsui K. Kobayashi award: Discovery of cerebellar and pineal neurosteroids and their biological actions on the growth and survival of Purkinje cells during development (review). Gen Comp Endocrinol 2019; 284:113051. [PMID: 30339808 DOI: 10.1016/j.ygcen.2018.10.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Revised: 10/09/2018] [Accepted: 10/15/2018] [Indexed: 11/21/2022]
Abstract
The brain has traditionally been considered to be a target site of peripheral steroid hormones. On the other hand, extensive studies over the past thirty years have demonstrated that the brain is a site of biosynthesis of several steroids. Such steroids synthesized de novo from cholesterol in the brain are called neurosteroids. To investigate the biosynthesis and biological actions of neurosteroids in the brain, data on the regio- and temporal-specific synthesis of neurosteroids are needed. In the mid 1990s, the Purkinje cell, an important cerebellar neuron, was discovered as a major cell producing neurosteroids in the brain of vertebrates. It was the first demonstration of de novo neuronal biosynthesis of neurosteroids in the brain. Subsequently, neuronal biosynthesis of neurosteroids and biological actions of neurosteroids have become clear by the follow-up studies using the Purkinje cell as an excellent cellular model. Progesterone and estradiol, which are known as sex steroid hormones, are actively synthesized de novo from cholesterol in the Purkinje cell during development, when cerebellar neuronal circuit formation occurs. Importantly, progesterone and estradiol synthesized in the Purkinje cell promote dendritic growth, spinogenesis and synaptogenesis via their cognate nuclear receptors in the Purkinje cell. Neurotrophic factors may mediate these neurosteroid actions. Futhermore, allopregnanolone (3α,5α-tetrahydroprogesterone), a progesterone metabolite, is also synthesized in the cerebellum and acts on the survival of Purkinje cells. On the other hand, at the beginning of 2010s, the pineal gland, an endocrine organ located close to the cerebellum, was discovered as an important site of the biosynthesis of neurosteroids. Allopregnanolone, a major pineal neurosteroid, acts on the Purkinje cell for the survival of Purkinje cells by suppressing the expression of caspase-3, a crucial mediator of apoptosis. I as a recipient of Kobayashi Award from the Japan Society for Comparative Endocrinology in 2016 summarize the discovery of cerebellar and pineal neurosteroids and their biological actions on the growth and survival of Purkinje cells during development.
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Affiliation(s)
- Kazuyoshi Tsutsui
- Laboratory of Integrative Brain Sciences, Department of Biology, Waseda University, and Center for Medical Life Science of Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan.
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16
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Cabrera Zapata LE, Bollo M, Cambiasso MJ. Estradiol-Mediated Axogenesis of Hypothalamic Neurons Requires ERK1/2 and Ryanodine Receptors-Dependent Intracellular Ca 2+ Rise in Male Rats. Front Cell Neurosci 2019; 13:122. [PMID: 31001087 PMCID: PMC6454002 DOI: 10.3389/fncel.2019.00122] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 03/12/2019] [Indexed: 12/12/2022] Open
Abstract
17β-estradiol (E2) induces axonal growth through extracellular signal-regulated kinase 1 and 2 (ERK1/2)-MAPK cascade in hypothalamic neurons of male rat embryos in vitro, but the mechanism that initiates these events is poorly understood. This study reports the intracellular Ca2+ increase that participates in the activation of ERK1/2 and axogenesis induced by E2. Hypothalamic neuron cultures were established from 16-day-old male rat embryos and fed with astroglia-conditioned media for 48 h. E2-induced ERK phosphorylation was completely abolished by a ryanodine receptor (RyR) inhibitor (ryanodine) and partially attenuated by an L-type voltage-gated Ca2+ channel (L-VGCC) blocker (nifedipine), an inositol-1,4,5-trisphosphate receptor (IP3R) inhibitor (2-APB), and a phospholipase C (PLC) inhibitor (U-73122). We also conducted Ca2+ imaging recording using primary cultured neurons. The results show that E2 rapidly induces an increase in cytosolic Ca2+, which often occurs in repetitive Ca2+ oscillations. This response was not observed in the absence of extracellular Ca2+ or with inhibitory ryanodine and was markedly reduced by nifedipine. E2-induced axonal growth was completely inhibited by ryanodine. In summary, the results suggest that Ca2+ mobilization from extracellular space as well as from the endoplasmic reticulum is necessary for E2-induced ERK1/2 activation and axogenesis. Understanding the mechanisms of brain estrogenic actions might contribute to develop novel estrogen-based therapies for neurodegenerative diseases.
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Affiliation(s)
- Lucas E Cabrera Zapata
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Mariana Bollo
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - María Julia Cambiasso
- Instituto de Investigación Médica Mercedes y Martín Ferreyra, INIMEC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina.,Cátedra de Biología Celular, Facultad de Odontología, Universidad Nacional de Córdoba, Córdoba, Argentina
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17
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Goddings AL, Beltz A, Peper JS, Crone EA, Braams BR. Understanding the Role of Puberty in Structural and Functional Development of the Adolescent Brain. JOURNAL OF RESEARCH ON ADOLESCENCE : THE OFFICIAL JOURNAL OF THE SOCIETY FOR RESEARCH ON ADOLESCENCE 2019; 29:32-53. [PMID: 30869842 DOI: 10.1111/jora.12408] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Over the past two decades, there has been a tremendous increase in our understanding of structural and functional brain development in adolescence. However, understanding the role of puberty in this process has received much less attention. This review examines this relationship by summarizing recent research studies where the role of puberty was investigated in relation to brain structure, connectivity, and task-related functional magnetic resonance imaging (fMRI). The studies together suggest that puberty may contribute to adolescent neural reorganization and maturational advancement, and sex differences also emerge in puberty. The current body of work shows some mixed results regarding impact and exact direction of pubertal influence. We discuss several limitations of current studies and propose future directions on how to move the field forward.
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Affiliation(s)
| | | | - Jiska S Peper
- Leiden University
- Leiden Institute for Brain and Cognition
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18
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Pedraza LK, Sierra RO, Giachero M, Nunes-Souza W, Lotz FN, de Oliveira Alvares L. Chronic fluoxetine prevents fear memory generalization and enhances subsequent extinction by remodeling hippocampal dendritic spines and slowing down systems consolidation. Transl Psychiatry 2019; 9:53. [PMID: 30705259 PMCID: PMC6355903 DOI: 10.1038/s41398-019-0371-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 11/16/2018] [Accepted: 01/01/2019] [Indexed: 11/11/2022] Open
Abstract
Fear memory overgeneralization contributes to the genesis and persistence of anxiety disorders and is a central hallmark in the pathophysiology of post-traumatic stress disorder (PTSD). Recent findings suggest that fear generalization is closely related to hippocampal dependency during retrieval. The selective serotonin reuptake inhibitor (SSRI) fluoxetine has been used as a first-line treatment for PTSD; however, how it exerts its therapeutic effect remains a matter of debate. Here, using contextual fear conditioning in rats, we show that chronic fluoxetine treatment prevents fear generalization and enhances subsequent extinction. Moreover, fluoxetine treatment after extinction prevents spontaneous recovery. The mechanism through which fluoxetine affects generalization and extinction seems to be through the postponement of systems consolidation, thereby maintaining hippocampal involvement during retrieval. Such an effect relies on a remodeling of dendritic spines in the hippocampus, as well as the number of mature, mushroom-type spines promoted by fluoxetine treatment. In order to further investigate whether fear generalization is a potential predictor of extinction effectiveness, we categorized a large naive population according to their generalization rate. We found that discriminator rats showed a better extinction profile compared to generalizers, suggesting that the generalization rate predicts extinction effectiveness. Hence, we propose that the therapeutic strategy of choice should take into account the extension of memory generalization, in which therapies based on extinction could induce a better outcome in patients who present less fear overgeneralization. These results open new avenues for the development of interventions that prevent fear generalization by maintaining memory dependency of the hippocampus.
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Affiliation(s)
- Lizeth K. Pedraza
- Laboratório de Neurobiologia da Memória, Biosciences Institute, Porto Alegre, 91.501-970 Brazil ,0000 0001 2200 7498grid.8532.cGraduate Program in Neuroscience, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90.046-900 Brazil
| | - Rodrigo O. Sierra
- 0000 0001 2200 7498grid.8532.cGraduate Program in Neuroscience, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90.046-900 Brazil ,Laboratório de Psicobiologia e Neurocomputação, Biophysics Department, Biosciences Institute, Porto Alegre, 91.501-970 Brazil
| | - Marcelo Giachero
- 0000 0001 2188 7235grid.411237.2Department of Pharmacology, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Walquiria Nunes-Souza
- 0000 0001 2200 7498grid.8532.cGraduate Program in Neuroscience, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90.046-900 Brazil
| | - Fernanda N. Lotz
- Laboratório de Psicobiologia e Neurocomputação, Biophysics Department, Biosciences Institute, Porto Alegre, 91.501-970 Brazil
| | - Lucas de Oliveira Alvares
- Laboratório de Neurobiologia da Memória, Biosciences Institute, Porto Alegre, 91.501-970, Brazil. .,Graduate Program in Neuroscience, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Porto Alegre, 90.046-900, Brazil.
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19
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Rezzani R, Franco C, Rodella LF. Sex differences of brain and their implications for personalized therapy. Pharmacol Res 2019; 141:429-442. [PMID: 30659897 DOI: 10.1016/j.phrs.2019.01.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 01/14/2019] [Accepted: 01/15/2019] [Indexed: 01/06/2023]
Abstract
Nowadays, it is known that the sex differences regard many organs, e.g., liver, vessels, pancreas, lungs, bronchi and also the brain. Sex differences are not just a matter of ethical and moral principles, as they are central to explain many still unknown diseases and their understanding is a prerequisite to develop an effective therapy for each individual. This review reports on those sex differences that are not only macroscopic and morphological, but also involve molecular and functional dimorphism in the brain. It will recapitulate the main structural differences between male and female brain including the neurotransmission systems; in particular, the main objective is to identify a correlation, already known or to be investigated in the future, between the differences that characterize male and female brains from a morphological and biochemical point of view and neurological syndromes. This correlation could provide a starting point for future scientific research aimed to investigate and define a personalized therapy.
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Affiliation(s)
- Rita Rezzani
- Anatomy and Physiopathology Division, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy; Interdipartimental University Center of Research "Adaption and Regeneration of Tissues and Organs-(ARTO)", University of Brescia, 25123 Brescia, Italy.
| | - Caterina Franco
- Anatomy and Physiopathology Division, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Luigi F Rodella
- Anatomy and Physiopathology Division, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, 25123 Brescia, Italy; Interdipartimental University Center of Research "Adaption and Regeneration of Tissues and Organs-(ARTO)", University of Brescia, 25123 Brescia, Italy
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20
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Stress influences the dynamics of hippocampal structural remodeling associated with fear memory extinction. Neurobiol Learn Mem 2018; 155:412-421. [DOI: 10.1016/j.nlm.2018.09.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 08/11/2018] [Accepted: 09/04/2018] [Indexed: 01/12/2023]
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21
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McDonough PM, Prigozhina NL, Basa RCB, Price JH. Assay of Calcium Transients and Synapses in Rat Hippocampal Neurons by Kinetic Image Cytometry and High-Content Analysis: An In Vitro Model System for Postchemotherapy Cognitive Impairment. Assay Drug Dev Technol 2018; 15:220-236. [PMID: 28723268 DOI: 10.1089/adt.2017.797] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Postchemotherapy cognitive impairment (PCCI) is commonly exhibited by cancer patients treated with a variety of chemotherapeutic agents, including the endocrine disruptor tamoxifen (TAM). The etiology of PCCI is poorly understood. Our goal was to develop high-throughput assay methods to test the effects of chemicals on neuronal function applicable to PCCI. Rat hippocampal neurons (RHNs) were plated in 96- or 384-well dishes and exposed to test compounds (forskolin [FSK], 17β-estradiol [ES]), TAM or fulvestrant [FUL], aka ICI 182,780) for 6-14 days. Kinetic Image Cytometry™ (KIC™) methods were developed to quantify spontaneously occurring intracellular calcium transients representing the activity of the neurons, and high-content analysis (HCA) methods were developed to quantify the expression, colocalization, and puncta formed by synaptic proteins (postsynaptic density protein-95 [PSD-95] and presynaptic protein Synapsin-1 [Syn-1]). As quantified by KIC, FSK increased the occurrence and synchronization of the calcium transients indicating stimulatory effects on RHN activity, whereas TAM had inhibitory effects. As quantified by HCA, FSK also increased PSD-95 puncta and PSD-95:Syn-1 colocalization, whereas ES increased the puncta of both PSD-95 and Syn-1 with little effect on colocalization. The estrogen receptor antagonist FUL also increased PSD-95 puncta. In contrast, TAM reduced Syn-1 and PSD-95:Syn-1 colocalization, consistent with its inhibitory effects on the calcium transients. Thus TAM reduced activity and synapse formation by the RHNs, which may relate to the ability of this agent to cause PCCI. The results illustrate that KIC and HCA can be used to quantify neurotoxic and neuroprotective effects of chemicals in RHNs to investigate mechanisms and potential therapeutics for PCCI.
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Affiliation(s)
| | | | | | - Jeffrey H Price
- 1 Vala Sciences Inc. , San Diego, California.,3 The Scintillon Institute , San Diego, California
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Murakami G, Hojo Y, Kato A, Komatsuzaki Y, Horie S, Soma M, Kim J, Kawato S. Rapid nongenomic modulation by neurosteroids of dendritic spines in the hippocampus: Androgen, oestrogen and corticosteroid. J Neuroendocrinol 2018; 30. [PMID: 29194818 DOI: 10.1111/jne.12561] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 11/24/2017] [Accepted: 11/27/2017] [Indexed: 12/22/2022]
Abstract
Memories are stored in synapses that consist of axon terminals and dendritic spines. Dendritic spines are postsynaptic structures of synapses and are essential for synaptic plasticity and cognition. Therefore, extensive investigations concerning the functions and structures of spines have been performed. Sex steroids and stress steroids have been shown to modulate hippocampal synapses. Although the rapid modulatory action of sex steroids on synapses has been studied in hippocampal neurones over several decades, the essential molecular mechanisms have not been fully understood. Here, a description of kinase-dependent signalling mechanisms is provided that can explain the rapid nongenomic modulation of dendritic spinogenesis in rat and mouse hippocampal slices by the application of sex steroids, including dihydrotestosterone, testosterone, oestradiol and progesterone. We also indicate the role of synaptic (classic) sex steroid receptors that trigger these rapid synaptic modulations. Moreover, we describe rapid nongenomic spine modulation by applying corticosterone, which is an acute stress model of the hippocampus. The explanations for the results obtained are mainly based on the optical imaging of dendritic spines. Comparisons are also performed with results obtained from other types of imaging, including electron microscopic imaging. Relationships between spine modulation and modulation of cognition are discussed. We recognise that most of rapid effects of exogenously applied oestrogen and androgen were observed in steroid-depleted conditions, including acute slices of the hippocampus, castrated male animals and ovariectomised female animals. Therefore, the previously observed effects can be considered as a type of recovery event, which may be essentially similar to hormone replacement therapy under hormone-decreased conditions. On the other hand, in gonadally intact young animals with high levels of endogenous sex hormones, further supplementation of sex hormones might not be effective, whereas the infusion of blockers for steroid receptors or kinases may be effective, with respect to suppressing sex hormone functions, thus providing useful information regarding molecular mechanisms.
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Affiliation(s)
- G Murakami
- Department of Liberal Arts, Faculty of Medicine, Saitama Medical University, Iruma, Saitama, Japan
| | - Y Hojo
- Department of Biochemistry, Faculty of Medicine, Saitama Medical University, Iruma, Saitama, Japan
| | - A Kato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Meguro, Tokyo, Japan
| | - Y Komatsuzaki
- Department of Physics, College of Science and Technology, Nihon University, Chiyoda, Tokyo, Japan
| | - S Horie
- Department of Urology, Graduate School of Medicine, Juntendo University, Hongo, Tokyo, Japan
| | - M Soma
- Department of Cognitive Neuroscience, Faculty of Pharma-Science, Teikyo University, Itabashi, Tokyo, Japan
| | - J Kim
- Department of Cognitive Neuroscience, Faculty of Pharma-Science, Teikyo University, Itabashi, Tokyo, Japan
| | - S Kawato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Meguro, Tokyo, Japan
- Department of Urology, Graduate School of Medicine, Juntendo University, Hongo, Tokyo, Japan
- Department of Cognitive Neuroscience, Faculty of Pharma-Science, Teikyo University, Itabashi, Tokyo, Japan
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Moore AM, Campbell RE. Polycystic ovary syndrome: Understanding the role of the brain. Front Neuroendocrinol 2017; 46:1-14. [PMID: 28551304 DOI: 10.1016/j.yfrne.2017.05.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 05/19/2017] [Accepted: 05/20/2017] [Indexed: 01/09/2023]
Abstract
Polycystic ovary syndrome (PCOS) is a prevalent endocrine disorder and the leading cause of anovulatory infertility. Characterised by hyperandrogenism, menstrual dysfunction and polycystic ovaries, PCOS is a broad-spectrum disorder unlikely to stem from a single common origin. Although commonly considered an ovarian disease, the brain is now a prime suspect in both the ontogeny and pathology of PCOS. We discuss here the neuroendocrine impairments present in PCOS that implicate involvement of the brain and review evidence gained from pre-clinical models of the syndrome about the specific brain circuitry involved. In particular, we focus on the impact that developmental androgen excess and adult hyperandrogenemia have in programming and regulating brain circuits important in the central regulation of fertility. The studies discussed here provide compelling support for the importance of the brain in PCOS ontogeny and pathophysiology and highlight the need for a better understanding of the underlying mechanisms involved.
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Affiliation(s)
- Aleisha M Moore
- Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Rebecca E Campbell
- Centre for Neuroendocrinology and Department of Physiology, Biomedical Sciences, University of Otago, Dunedin 9054, New Zealand.
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Diaz A, Treviño S, Vázquez-Roque R, Venegas B, Espinosa B, Flores G, Fernández-G JM, Montaño LF, Guevara J. The aminoestrogen prolame increases recognition memory and hippocampal neuronal spine density in aged mice. Synapse 2017; 71:e21987. [PMID: 28545157 DOI: 10.1002/syn.21987] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 05/18/2017] [Accepted: 05/19/2017] [Indexed: 12/24/2022]
Abstract
The aging brain shows biochemical and morphological changes in the dendrites of pyramidal neurons from the limbic system associated with memory loss. Prolame (N-(3-hydroxy-1,3,5 (10)-estratrien-17β-yl)-3-hydroxypropylamine) is a non-feminizing aminoestrogen with antithrombotic activity that prevents neuronal deterioration, oxidative stress, and neuroinflammation. Our aim was to evaluate the effect of prolame on motor and cognitive processes, as well as its influence on the dendritic morphology of neurons at the CA1, CA3, and granule cells of the dentate gyrus (DG) regions of hippocampus (HP), and medium spiny neurons of the nucleus accumbens (NAcc) of aged mice. Dendritic morphology was assessed with the Golgi-Cox stain procedure followed by Sholl analysis. Prolame (60 µg/kg) was subcutaneously injected daily for 60 days in 18-month-old mice. Immediately after treatment, locomotor activity in a new environment and recognition memory using the Novel Object Recognition Task (NORT) were evaluated. Prolame-treated mice showed a significant increase in the long-term exploration quotient, but locomotor activity was not modified in comparison to control animals. Prolame-treated mice showed a significant increase in dendritic spines density and dendritic length in neurons of the CA1, CA3, and DG regions of the HP, whereas dendrites of neurons in the NAcc remained unmodified. In conclusion, prolame administration promotes hippocampal plasticity processes but not in the NAcc neurons of aged mice, thus improving long-term recognition memory. Prolame could become a pharmacological alternative to prevent or delay the brain aging process, and thus the emergence of neurodegenerative diseases that affect memory.
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Affiliation(s)
- Alfonso Diaz
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Pue, Mexico
| | - Samuel Treviño
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Pue, Mexico
| | - Rubén Vázquez-Roque
- Instituto de Fisiología, Benemérita Universidad Autónoma de Puebla, Pue, Mexico
| | - Berenice Venegas
- Facultad de Ciencias Biológicas, Benemérita Universidad Autónoma de Puebla, Pue, Mexico
| | - Blanca Espinosa
- Departamento de Bioquímica, Instituto Nacional de Enfermedades Respiratorias INER, Ciudad de México, Mexico
| | - Gonzalo Flores
- Instituto de Fisiología, Benemérita Universidad Autónoma de Puebla, Pue, Mexico
| | | | - Luis F Montaño
- Departamento de Biología Celular y Tisular, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Jorge Guevara
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
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Depypere H, Vierin A, Weyers S, Sieben A. Alzheimer’s disease, apolipoprotein E and hormone replacement therapy. Maturitas 2016; 94:98-105. [DOI: 10.1016/j.maturitas.2016.09.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 08/05/2016] [Accepted: 09/13/2016] [Indexed: 01/27/2023]
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27
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Tajik A, Rezayof A, Ghasemzadeh Z, Sardari M. Activation of the dorsal hippocampal nicotinic acetylcholine receptors improves tamoxifen-induced memory retrieval impairment in adult female rats. Neuroscience 2016; 327:1-9. [DOI: 10.1016/j.neuroscience.2016.04.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Revised: 04/04/2016] [Accepted: 04/05/2016] [Indexed: 12/20/2022]
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Hasbani MJ, Underhill SM, De Erausquin G, Goldberg MP. Synapse Loss and Regeneration: A Mechanism for Functional Decline and Recovery after Cerebral Ischemia? Neuroscientist 2016. [DOI: 10.1177/107385840000600208] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Little is known of the mechanisms governing functional recovery after ischemic brain injury, and there is no clinical therapy established to restore neurologic function after ischemic injury is complete. Even so, pronounced spontaneous recovery of function is often observed in a subset of patients. Resolution of neurological deficits after ischemia must occur through replacement of lost tissue via production of new neurons, or through changes in the structure, function, or connectivity of surviving neurons. This review focuses on the neuronal synapse as a potential locus for functional recovery. Selective disruption of synaptic elements is a characteristic feature of hypoxic-ischemic brain injury, such as that seen in ischemic stroke or cardiac arrest. Ischemic damage to synapses occurs even in the absence of neuronal loss, and therefore might underlie the clinical disability observed in patients following mild or transient ischemia. We review evidence that recovery of lost synapses occurs after ischemic injury and that this recovery may be a necessary step for restoration of neurological function. The process of synapse loss and recovery can be examined in neuronal cultures and experimental stroke models. Such studies may help to gain a better understanding of the extracellular factors and intracellular cascades that facilitate recovery of synapses, and may result in therapeutic approaches to improve function after cerebral ischemia.
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Affiliation(s)
- M. Josh Hasbani
- Department of Neurology and Neuroscience Program, Washington University School of Medicine, St. Louis, Missouri
| | - Suzanne M. Underhill
- Department of Neurology and Neuroscience Program, Washington University School of Medicine, St. Louis, Missouri
| | - Gabriel De Erausquin
- Department of Neurology and Neuroscience Program, Washington University School of Medicine, St. Louis, Missouri
| | - Mark P. Goldberg
- Department of Neurology and Neuroscience Program, Washington University School of Medicine, St. Louis, Missouri
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Hamson DK, Roes MM, Galea LAM. Sex Hormones and Cognition: Neuroendocrine Influences on Memory and Learning. Compr Physiol 2016; 6:1295-337. [DOI: 10.1002/cphy.c150031] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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30
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Potier M, Georges F, Brayda-Bruno L, Ladépêche L, Lamothe V, Al Abed AS, Groc L, Marighetto A. Temporal Memory and Its Enhancement by Estradiol Requires Surface Dynamics of Hippocampal CA1 N-Methyl-D-Aspartate Receptors. Biol Psychiatry 2016; 79:735-745. [PMID: 26321020 DOI: 10.1016/j.biopsych.2015.07.017] [Citation(s) in RCA: 36] [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: 02/10/2015] [Revised: 07/03/2015] [Accepted: 07/20/2015] [Indexed: 11/18/2022]
Abstract
BACKGROUND Identifying the underlying cellular mechanisms of episodic memory is an important challenge, since this memory, based on temporal and contextual associations among events, undergoes preferential degradation in aging and various neuropsychiatric disorders. Memory storage of temporal and contextual associations is known to rely on hippocampal N-methyl-D-aspartate receptor (NMDAR)-dependent synaptic plasticity, which depends ex vivo on dynamic organization of surface NMDARs. Whether NMDAR surface trafficking sustains the formation of associative memory, however, remains unknown. METHODS We tested this hypothesis, using single nanoparticle imaging, electrophysiology, and behavioral approaches, in hippocampal networks challenged with a potent modulator of NMDAR-dependent synaptic plasticity and memory, 17β-estradiol (E2). RESULTS We demonstrate that E2 modulates NMDAR surface trafficking, a necessary condition for E2-induced potentiation at hippocampal cornu ammonis 1 synapses. Strikingly, cornu ammonis 1 NMDAR surface trafficking controls basal and E2-enhanced mnemonic retention of temporal, but not contextual, associations. CONCLUSIONS NMDAR surface trafficking and its modulation by the sex hormone E2 is a cellular mechanism critical for a major component of episodic memory, opening a new and noncanonical research avenue in the physiopathology of cognition.
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Affiliation(s)
- Mylène Potier
- Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U862 l'Institut National de la Santé et de la Recherche Médicale, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - François Georges
- Interdisciplinary Institute for NeuroSciences (FG, LL, LG, AM), Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5297, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - Laurent Brayda-Bruno
- Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U862 l'Institut National de la Santé et de la Recherche Médicale, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - Laurent Ladépêche
- Interdisciplinary Institute for NeuroSciences (FG, LL, LG, AM), Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5297, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - Valérie Lamothe
- Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U862 l'Institut National de la Santé et de la Recherche Médicale, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - Alice Shaam Al Abed
- Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U862 l'Institut National de la Santé et de la Recherche Médicale, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - Laurent Groc
- Interdisciplinary Institute for NeuroSciences (FG, LL, LG, AM), Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5297, Bordeaux, France; Université de Bordeaux (MP, FG, LB-B, LL, VL, SAA, LG), Bordeaux, France
| | - Aline Marighetto
- Neurocentre Magendie, Physiopathologie de la Plasticité Neuronale, U862 l'Institut National de la Santé et de la Recherche Médicale, Bordeaux, France; Interdisciplinary Institute for NeuroSciences (FG, LL, LG, AM), Centre National de la Recherche Scientifique, Unite Mixte de Recherche 5297, Bordeaux, France.
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31
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The hippocampus participates in the control of locomotion speed. Neuroscience 2015; 311:207-15. [PMID: 26597762 DOI: 10.1016/j.neuroscience.2015.10.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 09/30/2015] [Accepted: 10/20/2015] [Indexed: 12/25/2022]
Abstract
The hippocampus role in sensory-motor integration remains unclear. In these experiments we study its function in the locomotor control. To establish the connection between the hippocampus and the locomotor system, electrical stimulation in the CA1 region was applied and EMG recordings were obtained. We also evaluated the hindlimbs and forelimbs kinematic patterns in rats with a penetrating injury (PI) in the hippocampus as well as in a cortex-injured group (CI), which served as control. After the PI, tamoxifen a selective estrogen receptor modulator (SERM) that has been described as a neuroprotector and antiinflammatory drug, or vehicle was administered. Electrical stimulation in the hippocampus produces muscle contractions in the contralateral triceps, when 6 Hz or 8 Hz pulse trains were applied. The penetrating injury in the hippocampus reduced the EMG amplitude after the electrical stimulation. At 7 DPI (days post-injury) we observed an increase in the strides speed in all four limbs of the non-treated group, decreasing the correlation percentage of the studied joints. After 15 DPI the strides speed in the non-treated returned to normal. These changes did not occur in the tamoxifen group nor in cortex-injured group. After 30 days, the nontreated group presented a reduction in the number of pyramidal cell layer neurons at the injury site, in comparison to the tam-treated group. The loss of neurons, may cause the interruption of the trisynaptic circuit and changes in the locomotion speed. Tamoxifen preserves the pyramidal neurons after the injury, probably resulting in the strides speed recovery.
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32
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Frick KM, Kim J, Tuscher JJ, Fortress AM. Sex steroid hormones matter for learning and memory: estrogenic regulation of hippocampal function in male and female rodents. Learn Mem 2015; 22:472-93. [PMID: 26286657 PMCID: PMC4561402 DOI: 10.1101/lm.037267.114] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 07/09/2015] [Indexed: 01/24/2023]
Abstract
Ample evidence has demonstrated that sex steroid hormones, such as the potent estrogen 17β-estradiol (E2), affect hippocampal morphology, plasticity, and memory in male and female rodents. Yet relatively few investigators who work with male subjects consider the effects of these hormones on learning and memory. This review describes the effects of E2 on hippocampal spinogenesis, neurogenesis, physiology, and memory, with particular attention paid to the effects of E2 in male rodents. The estrogen receptors, cell-signaling pathways, and epigenetic processes necessary for E2 to enhance memory in female rodents are also discussed in detail. Finally, practical considerations for working with female rodents are described for those investigators thinking of adding females to their experimental designs.
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Affiliation(s)
- Karyn M Frick
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Jaekyoon Kim
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Jennifer J Tuscher
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
| | - Ashley M Fortress
- Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA
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Arevalo MA, Azcoitia I, Gonzalez-Burgos I, Garcia-Segura LM. Signaling mechanisms mediating the regulation of synaptic plasticity and memory by estradiol. Horm Behav 2015; 74:19-27. [PMID: 25921586 DOI: 10.1016/j.yhbeh.2015.04.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 04/02/2015] [Accepted: 04/20/2015] [Indexed: 01/29/2023]
Abstract
This article is part of a Special Issue "Estradiol and Cognition". Estradiol participates in the regulation of the function and plasticity of synaptic circuits in key cognitive brain regions, such as the prefrontal cortex and the hippocampus. The mechanisms elicited by estradiol are mediated by the regulation of transcriptional activity by nuclear estrogen receptors and by intracellular signaling cascades activated by estrogen receptors associated with the plasma membrane. In addition, the mechanisms include the interaction of estradiol with the signaling of other factors involved in the regulation of cognition, such as brain derived neurotrophic factor, insulin-like growth factor-1 and Wnt. Modifications in these signaling pathways by aging or by a long-lasting ovarian hormone deprivation after menopause may impair the enhancing effects of estradiol on synaptic plasticity and cognition.
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Affiliation(s)
- Maria-Angeles Arevalo
- Instituto Cajal, Consejo Superior de Investigaciones Científicas, Avenida Doctor Arce 37, E-28002 Madrid, Spain
| | - Iñigo Azcoitia
- Department of Cell Biology, Faculty of Biology, Universidad Complutense, Calle José Antonio Novais 12, Ciudad Universitaria, E-28040 Madrid, Spain
| | - Ignacio Gonzalez-Burgos
- Laboratorio de Psicobiología, División de Neurociencias, Centro de Investigación Biomédica de Occidente, Instituto Mexicano del Seguro Social, Guadalajara, Jal. Mexico
| | - Luis M Garcia-Segura
- Instituto Cajal, Consejo Superior de Investigaciones Científicas, Avenida Doctor Arce 37, E-28002 Madrid, Spain.
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Shum C, Macedo SC, Warre-Cornish K, Cocks G, Price J, Srivastava DP. Utilizing induced pluripotent stem cells (iPSCs) to understand the actions of estrogens in human neurons. Horm Behav 2015; 74:228-42. [PMID: 26143621 PMCID: PMC4579404 DOI: 10.1016/j.yhbeh.2015.06.014] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Revised: 06/11/2015] [Accepted: 06/25/2015] [Indexed: 01/05/2023]
Abstract
This article is part of a Special Issue "Estradiol and Cognition". Over recent years tremendous progress has been made towards understanding the molecular and cellular mechanism by which estrogens exert enhancing effects on cognition, and how they act as a neuroprotective or neurotrophic agent in disease. Currently, much of this work has been carried out in animal models with only a limited number of studies using native human tissue or cells. Recent advances in stem cell technology now make it possible to reprogram somatic cells from humans into induced pluripotent stem cells (iPSCs), which can subsequently be differentiated into neurons of specific lineages. Importantly, the reprogramming of cells allows for the generation of iPSCs that retain the genetic "makeup" of the donor. Therefore, it is possible to generate iPSC-derived neurons from patients diagnosed with specific diseases, that harbor the complex genetic background associated with the disorder. Here, we review the iPSC technology and how it's currently being used to model neural development and neurological diseases. Furthermore, we explore whether this cellular system could be used to understand the role of estrogens in human neurons, and present preliminary data in support of this. We further suggest that the use of iPSC technology offers a novel system to not only further understand estrogens' effects in human cells, but also to investigate the mechanism by which estrogens are beneficial in disease. Developing a greater understanding of these mechanisms in native human cells will also aid in the development of safer and more effective estrogen-based therapeutics.
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Affiliation(s)
- Carole Shum
- Department of Basic and Clinical Neuroscience, Cell and Behaviour Unit, The James Black Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK
| | - Sara C Macedo
- Department of Basic and Clinical Neuroscience, Cell and Behaviour Unit, The James Black Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK; Faculty of Engineering, Universidade do Porto, 4200-465 Porto, Portugal
| | - Katherine Warre-Cornish
- Department of Basic and Clinical Neuroscience, Cell and Behaviour Unit, The James Black Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK
| | - Graham Cocks
- Department of Basic and Clinical Neuroscience, Cell and Behaviour Unit, The James Black Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK
| | - Jack Price
- Department of Basic and Clinical Neuroscience, Cell and Behaviour Unit, The James Black Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK
| | - Deepak P Srivastava
- Department of Basic and Clinical Neuroscience, Cell and Behaviour Unit, The James Black Centre, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE5 8AF, UK.
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Hojo Y, Munetomo A, Mukai H, Ikeda M, Sato R, Hatanaka Y, Murakami G, Komatsuzaki Y, Kimoto T, Kawato S. Estradiol rapidly modulates spinogenesis in hippocampal dentate gyrus: Involvement of kinase networks. Horm Behav 2015; 74:149-56. [PMID: 26122288 DOI: 10.1016/j.yhbeh.2015.06.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Revised: 06/04/2015] [Accepted: 06/05/2015] [Indexed: 01/15/2023]
Abstract
This article is part of a Special Issue "Estradiol and cognition". Estradiol (E2) is locally synthesized within the hippocampus and the gonads. Rapid modulation of hippocampal synaptic plasticity by E2 is essential for synaptic regulation. The molecular mechanisms of modulation through the synaptic estrogen receptor (ER) and its downstream signaling, however, are largely unknown in the dentate gyrus (DG). We investigated the E2-induced modulation of dendritic spines in male adult rat hippocampal slices by imaging Lucifer Yellow-injected DG granule cells. Treatments with 1 nM E2 increased the density of spines by approximately 1.4-fold within 2h. Spine head diameter analysis showed that the density of middle-head spines (0.4-0.5 μm) was significantly increased. The E2-induced spine density increase was suppressed by blocking Erk MAPK, PKA, PKC and LIMK. These suppressive effects by kinase inhibitors are not non-specific ones because the GSK-3β antagonist did not inhibit E2-induced spine increase. The ER antagonist ICI 182,780 also blocked the E2-induced spine increase. Taken together, these results suggest that E2 rapidly increases the density of spines through kinase networks that are driven by synaptic ER.
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Affiliation(s)
- Yasushi Hojo
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan; Bioinformatics Project of Japan Science and Technology Agency, University of Tokyo, Japan
| | - Arisa Munetomo
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
| | - Hideo Mukai
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan; Bioinformatics Project of Japan Science and Technology Agency, University of Tokyo, Japan
| | - Muneki Ikeda
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
| | - Rei Sato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
| | - Yusuke Hatanaka
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
| | - Gen Murakami
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan; Bioinformatics Project of Japan Science and Technology Agency, University of Tokyo, Japan
| | - Yoshimasa Komatsuzaki
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
| | - Tetsuya Kimoto
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan
| | - Suguru Kawato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153-8902, Japan; Bioinformatics Project of Japan Science and Technology Agency, University of Tokyo, Japan; Department of Urology, Juntendo University, Graduate School of Medicine, Tokyo 113-8431, Japan.
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Frick KM. Molecular mechanisms underlying the memory-enhancing effects of estradiol. Horm Behav 2015; 74:4-18. [PMID: 25960081 PMCID: PMC4573242 DOI: 10.1016/j.yhbeh.2015.05.001] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 04/25/2015] [Accepted: 05/01/2015] [Indexed: 11/18/2022]
Abstract
This article is part of a Special Issue "Estradiol and cognition". Since the publication of the 1998 special issue of Hormones and Behavior on estrogens and cognition, substantial progress has been made towards understanding the molecular mechanisms through which 17β-estradiol (E2) regulates hippocampal plasticity and memory. Recent research has demonstrated that rapid effects of E2 on hippocampal cell signaling, epigenetic processes, and local protein synthesis are necessary for E2 to facilitate the consolidation of object recognition and spatial memories in ovariectomized female rodents. These effects appear to be mediated by non-classical actions of the intracellular estrogen receptors ERα and ERβ, and possibly by membrane-bound ERs such as the G-protein-coupled estrogen receptor (GPER). New findings also suggest a key role of hippocampally-synthesized E2 in regulating hippocampal memory formation. The present review discusses these findings in detail and suggests avenues for future study.
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Affiliation(s)
- Karyn M Frick
- Department of Psychology, University of Wisconsin-Milwaukee, 2441 E. Hartford Ave., Milwaukee, WI 53211, USA.
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Tozzi A, de Iure A, Tantucci M, Durante V, Quiroga-Varela A, Giampà C, Di Mauro M, Mazzocchetti P, Costa C, Di Filippo M, Grassi S, Pettorossi VE, Calabresi P. Endogenous 17β-estradiol is required for activity-dependent long-term potentiation in the striatum: interaction with the dopaminergic system. Front Cell Neurosci 2015; 9:192. [PMID: 26074768 PMCID: PMC4445326 DOI: 10.3389/fncel.2015.00192] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 04/30/2015] [Indexed: 11/13/2022] Open
Abstract
17β-estradiol (E2), a neurosteroid synthesized by P450-aromatase (ARO), modulates various brain functions. We characterized the role of the locally synthesized E2 on striatal long-term synaptic plasticity and explored possible interactions between E2 receptors (ERs) and dopamine (DA) receptors in the dorsal striatum of adult male rats. Inhibition of E2 synthesis or antagonism of ERs prevented the induction of long-term potentiation (LTP) in both medium spiny neurons (MSNs) and cholinergic interneurons (ChIs). Activation of a D1-like DA receptor/cAMP/PKA-dependent pathway restored LTP. In MSNs exogenous E2 reversed the effect of ARO inhibition. Also antagonism of M1 muscarinic receptors prevented the D1-like receptor-mediated restoration of LTP confirming a role for ChIs in controlling the E2-mediated LTP of MSNs. A novel striatal interaction, occurring between ERs and D1-like receptors in both MSNs and ChIs, might be critical to regulate basal ganglia physiology and to compensate synaptic alterations in Parkinson’s disease.
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Affiliation(s)
- Alessandro Tozzi
- Department of Experimental Medicine, Section of Physiology and Biochemistry, University of Perugia Perugia, Italy ; Fondazione Santa Lucia, IRCCS Rome, Italy
| | - Antonio de Iure
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | - Michela Tantucci
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | - Valentina Durante
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | - Ana Quiroga-Varela
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | | | - Michela Di Mauro
- Department of Experimental Medicine, Section of Physiology and Biochemistry, University of Perugia Perugia, Italy
| | - Petra Mazzocchetti
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | - Cinzia Costa
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | - Massimiliano Di Filippo
- Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
| | - Silvarosa Grassi
- Department of Experimental Medicine, Section of Physiology and Biochemistry, University of Perugia Perugia, Italy
| | - Vito Enrico Pettorossi
- Department of Experimental Medicine, Section of Physiology and Biochemistry, University of Perugia Perugia, Italy
| | - Paolo Calabresi
- Fondazione Santa Lucia, IRCCS Rome, Italy ; Clinica Neurologica, Dipartimento di Medicina, Università degli Studi di Perugia, Ospedale Santa Maria della Misericordia Perugia, Italy
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Khan MM, Wakade C, de Sevilla L, Brann DW. Selective estrogen receptor modulators (SERMs) enhance neurogenesis and spine density following focal cerebral ischemia. J Steroid Biochem Mol Biol 2015; 146:38-47. [PMID: 24815952 PMCID: PMC4419701 DOI: 10.1016/j.jsbmb.2014.05.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 04/23/2014] [Accepted: 05/02/2014] [Indexed: 12/23/2022]
Abstract
Selective estrogen receptor modulators (SERMs) have been reported to enhance synaptic plasticity and improve cognitive performance in adult rats. SERMs have also been shown to induce neuroprotection against cerebral ischemia and other CNS insults. In this study, we sought to determine whether acute regulation of neurogenesis and spine remodeling could be a novel mechanism associated with neuroprotection induced by SERMs following cerebral ischemia. Toward this end, ovariectomized adult female rats were either implanted with pellets of 17β-estradiol (estrogen) or tamoxifen, or injected with raloxifene. After one week, cerebral ischemia was induced by the transient middle-cerebral artery occlusion (MCAO) method. Bromodeoxyuridine (BrdU) was injected to label dividing cells in brain. We analyzed neurogenesis and spine density at day-1 and day-5 post MCAO. In agreement with earlier findings, we observed a robust induction of neurogenesis in the ipsilateral subventricular zone (SVZ) of both the intact as well as ovariectomized female rats following MCAO. Interestingly, neurogenesis in the ipsilateral SVZ following ischemia was significantly higher in estrogen and raloxifene-treated animals compared to placebo-treated rats. In contrast, this enhancing effect on neurogenesis was not observed in tamoxifen-treated rats. Finally, both SERMs, as well as estrogen significantly reversed the spine density loss observed in the ischemic cortex at day-5 post ischemia. Taken, together these results reveal a profound structural remodeling potential of SERMs in the brain following cerebral ischemia. This article is part of a Special Issue entitled "Sex steroids and brain disorders".
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Affiliation(s)
- Mohammad M Khan
- Department of Biochemistry, Faculty of Medicine, Zaiwa University, AZ-Zawia, Libya
| | - Chandramohan Wakade
- Department of Physical Therapy, Georgia Regents University, Augusta, GA 30912, USA; Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Georgia Regents University, Augusta, GA 30912, USA
| | - Liesl de Sevilla
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Georgia Regents University, Augusta, GA 30912, USA
| | - Darrell W Brann
- Department of Neuroscience and Regenerative Medicine, Medical College of Georgia, Georgia Regents University, Augusta, GA 30912, USA.
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Giachero M, Calfa GD, Molina VA. Hippocampal dendritic spines remodeling and fear memory are modulated by GABAergic signaling within the basolateral amygdala complex. Hippocampus 2015; 25:545-55. [DOI: 10.1002/hipo.22409] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/28/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Marcelo Giachero
- IFEC-CONICET, Departamento de Farmacología; Facultad de Ciencias Químicas, Universidad Nacional de Córdoba; Córdoba Argentina
| | - Gaston D. Calfa
- IFEC-CONICET, Departamento de Farmacología; Facultad de Ciencias Químicas, Universidad Nacional de Córdoba; Córdoba Argentina
| | - Victor A. Molina
- IFEC-CONICET, Departamento de Farmacología; Facultad de Ciencias Químicas, Universidad Nacional de Córdoba; Córdoba Argentina
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Hasegawa Y, Hojo Y, Kojima H, Ikeda M, Hotta K, Sato R, Ooishi Y, Yoshiya M, Chung BC, Yamazaki T, Kawato S. Estradiol rapidly modulates synaptic plasticity of hippocampal neurons: Involvement of kinase networks. Brain Res 2015; 1621:147-61. [PMID: 25595055 DOI: 10.1016/j.brainres.2014.12.056] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 12/26/2014] [Accepted: 12/27/2014] [Indexed: 11/18/2022]
Abstract
Estradiol (E2) is locally synthesized within the hippocampus in addition to the gonads. Rapid modulation of hippocampal synaptic plasticity by E2 is essential for synaptic regulation. Molecular mechanisms of modulation through synaptic estrogen receptor (ER) and its downstream signaling, however, have been still unknown. We investigated induction of LTP by the presence of E2 upon weak theta burst stimulation (weak-TBS) in CA1 region of adult male hippocampus. Since only weak-TBS did not induce full-LTP, weak-TBS was sub-threshold stimulation. We observed LTP induction by the presence of E2, after incubation of hippocampal slices with 10nM E2 for 30 min, upon weak-TBS. This E2-induced LTP was blocked by ICI, an ER antagonist. This E2-LTP induction was inhibited by blocking Erk MAPK, PKA, PKC, PI3K, NR2B and CaMKII, individually, suggesting that Erk MAPK, PKA, PKC, PI3K and CaMKII may be involved in downstream signaling for activation of NMDA receptors. Interestingly, dihydrotestosterone suppressed the E2-LTP. We also investigated rapid changes of dendritic spines (=postsynapses) in response to E2, using hippocampal slices from adult male rats. We found 1nM E2 increased the density of spines by approximately 1.3-fold within 2h by imaging Lucifer Yellow-injected CA1 pyramidal neurons. The E2-induced spine increase was blocked by ICI. The increase in spines was suppressed by blocking PI3K, Erk MAPK, p38 MAPK, PKA, PKC, LIMK, CaMKII or calcineurin, individually. On the other hand, blocking JNK did not inhibit the E2-induced spine increase. Taken together, these results suggest that E2 rapidly induced LTP and also increased the spine density through kinase networks that are driven by synaptic ER. This article is part of a Special Issue entitled SI: Brain and Memory.
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Affiliation(s)
- Yoshitaka Hasegawa
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Yasushi Hojo
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Bioinformatics Project of Japan Science and Technology Agency, University of Tokyo, Tokyo, Japan; International Collaboration Project (Japan-Taiwan) of Japan Science and Technology Agency, University of Tokyo, Tokyo, Japan; Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Hiroki Kojima
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Muneki Ikeda
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Keisuke Hotta
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Rei Sato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Yuuki Ooishi
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Miyuki Yoshiya
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Bon-Chu Chung
- International Collaboration Project (Japan-Taiwan) of Japan Science and Technology Agency, University of Tokyo, Tokyo, Japan; Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan
| | - Takeshi Yamazaki
- Laboratory of Molecular Brain Science, Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Japan
| | - Suguru Kawato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Bioinformatics Project of Japan Science and Technology Agency, University of Tokyo, Tokyo, Japan; International Collaboration Project (Japan-Taiwan) of Japan Science and Technology Agency, University of Tokyo, Tokyo, Japan; Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan; Project of Special Coordinate Funds for Promoting Science and Technology of Ministry of Education, Science and Technology, University of Tokyo, Tokyo, Japan.
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Murakami G, Hojo Y, Ogiue-Ikeda M, Mukai H, Chambon P, Nakajima K, Ooishi Y, Kimoto T, Kawato S. Estrogen receptor KO mice study on rapid modulation of spines and long-term depression in the hippocampus. Brain Res 2014; 1621:133-46. [PMID: 25498865 DOI: 10.1016/j.brainres.2014.12.002] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 11/29/2014] [Accepted: 12/01/2014] [Indexed: 12/31/2022]
Abstract
Rapid modulation of hippocampal synaptic plasticity through synaptic estrogen receptors is an essential topic. We analyzed estradiol-induced modulation of CA1 dendritic spines using adult male ERαKO and ERβKO mice. A 2h treatment of estradiol particularly increased the density of middle-head spines (diameter 0.3-0.4 µm) in wild type mouse hippocampal slices. The enhancement of spinogenesis was completely suppressed by MAP kinase inhibitor. Estradiol-induced increase in middle-head spines was observed in ERβKO mice (which express ERα), but not in ERαKO, indicating that ERα is necessary for the spinogenesis. Direct observation of the dynamic estradiol-induced enhancing effect on rapid spinogenesis was performed using time-lapse imaging of spines in hippocampal live slices from yellow fluorescent protein expressed mice. Both appearance and disappearance of spines occurred, and the number of newly appeared spines was significantly greater than that of disappeared spines, resulting in the net increase of the spine density within 2h. As another type of synaptic modulation, we observed that estradiol rapidly enhanced N-methyl-D-aspartate (NMDA)-induced long-term depression (LTD) in CA1 of the wild type mouse hippocampus. In contrast, estradiol did not enhance NMDA-LTD in ERαKO mice, indicating the involvement of ERα in the estrogen signaling. This article is part of a Special Issue entitled SI: Brain and Memory.
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Affiliation(s)
- Gen Murakami
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Yasushi Hojo
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Core Research for Evolutional Science and Technology Project of Japan Science and Technology Agency, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Mari Ogiue-Ikeda
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Project of Special Coordinate Funds for Promoting Science and Technology of Ministry of Education, Science and Technology, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Hideo Mukai
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Core Research for Evolutional Science and Technology Project of Japan Science and Technology Agency, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Pierre Chambon
- Institut de Genetique et de Biologie Moleculaire et Cellulaire, Universite Louis Pasteur, Illkirch-Cedex, Communaute Urbaine de Strasbourg, France
| | - Kohei Nakajima
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Yuuki Ooishi
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Tetsuya Kimoto
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Core Research for Evolutional Science and Technology Project of Japan Science and Technology Agency, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan
| | - Suguru Kawato
- Department of Biophysics and Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Core Research for Evolutional Science and Technology Project of Japan Science and Technology Agency, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan; Project of Special Coordinate Funds for Promoting Science and Technology of Ministry of Education, Science and Technology, Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153, Japan.
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42
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Lee TM, Lin SZ, Chang NC. Both GPER and membrane oestrogen receptor-α activation protect ventricular remodelling in 17β oestradiol-treated ovariectomized infarcted rats. J Cell Mol Med 2014; 18:2454-65. [PMID: 25256868 PMCID: PMC4302651 DOI: 10.1111/jcmm.12430] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Accepted: 08/19/2014] [Indexed: 12/20/2022] Open
Abstract
Clinical and experimental studies have established that gender is a factor in the development of ventricular hypertrophy. We investigated whether the attenuated hypertrophic effect of oestradiol was via activation of phosphatidylinositol 3-kinase (PI3K)/Akt/endothelial nitric oxide synthase (eNOS) through non-genomic action. Twenty-four hours after coronary ligation, female Wistar rats were randomized into control, subcutaneous oestradiol treatment or a G-protein coupled oestrogen receptor (GPER) agonist, G-1 and treated for 4 weeks starting from 2 weeks after bilateral ovariectomy. Ventricular hypertrophy assessed by cardiomyocyte size after infarction was similarly attenuated by oestradiol or G-1 in infarcted rats. The phosphorylation of Akt and eNOS was significantly decreased in infarcted rats and restored by oestradiol and G-1, implying the GPER pathway in this process. Oestradiol-induced Akt phosphorylation was not abrogated by G-15 (a GPER blocker). Akt activation was not inhibited by actinomycin D. When a membrane-impermeable oestrogen-albumin construct was applied, similar responses in terms of eNOS activation to those of oestradiol were achieved. Furthermore, PPT, an ERα receptor agonist, activated the phosphorylation of Akt and eNOS. Thus, membrane ERα receptor played a role in mediating the phosphorylation of Akt and eNOS. The specific PI3K inhibitor, LY290042, completely abolished Akt activation and eNOS phosphorylation in infarcted hearts treated with either oestradiol or oestradiol + G-15. These data support the conclusions that oestradiol improves ventricular remodelling by both GPER- and membrane-bound ERα-dependent mechanisms that converge into the PI3K/Akt/eNOS pathway, unveiling a novel mechanism by which oestradiol regulates pathological cardiomyocyte growth after infarction.
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Affiliation(s)
- Tsung-Ming Lee
- Department of Medicine, Cardiology Section, China Medical University-An Nan Hospital, Tainan, Taiwan; Department of Medicine, China Medical University, Taichung, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
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Xu X, Miller EC, Pozzo-Miller L. Dendritic spine dysgenesis in Rett syndrome. Front Neuroanat 2014; 8:97. [PMID: 25309341 PMCID: PMC4159975 DOI: 10.3389/fnana.2014.00097] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2014] [Accepted: 08/25/2014] [Indexed: 11/13/2022] Open
Abstract
Spines are small cytoplasmic extensions of dendrites that form the postsynaptic compartment of the majority of excitatory synapses in the mammalian brain. Alterations in the numerical density, size, and shape of dendritic spines have been correlated with neuronal dysfunction in several neurological and neurodevelopmental disorders associated with intellectual disability, including Rett syndrome (RTT). RTT is a progressive neurodevelopmental disorder associated with intellectual disability that is caused by loss of function mutations in the transcriptional regulator methyl CpG-binding protein 2 (MECP2). Here, we review the evidence demonstrating that principal neurons in RTT individuals and Mecp2-based experimental models exhibit alterations in the number and morphology of dendritic spines. We also discuss the exciting possibility that signaling pathways downstream of brain-derived neurotrophic factor (BDNF), which is transcriptionally regulated by MeCP2, offer promising therapeutic options for modulating dendritic spine development and plasticity in RTT and other MECP2-associated neurodevelopmental disorders.
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Affiliation(s)
- Xin Xu
- Department of Neurobiology, Civitan International Research Center, The University of Alabama at Birmingham, Birmingham, AL USA
| | - Eric C Miller
- Department of Neurobiology, Civitan International Research Center, The University of Alabama at Birmingham, Birmingham, AL USA
| | - Lucas Pozzo-Miller
- Department of Neurobiology, Civitan International Research Center, The University of Alabama at Birmingham, Birmingham, AL USA
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44
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Hippocampal estradiol synthesis and its significance for hippocampal synaptic stability in male and female animals. Neuroscience 2014; 274:24-32. [DOI: 10.1016/j.neuroscience.2014.05.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 04/23/2014] [Accepted: 05/04/2014] [Indexed: 01/18/2023]
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Zhou L, Fester L, Haghshenas S, de Vrese X, von Hacht R, Gloger S, Brandt N, Bader M, Vollmer G, Rune GM. Oestradiol-induced synapse formation in the female hippocampus: roles of oestrogen receptor subtypes. J Neuroendocrinol 2014; 26:439-47. [PMID: 24779550 DOI: 10.1111/jne.12162] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 04/22/2014] [Accepted: 04/26/2014] [Indexed: 01/09/2023]
Abstract
During the oestrus cycle, varying spine synapse density correlates positively with varying local synthesis of oestradiol in the hippocampus. In this context, the roles of the oestrogen receptor (ER) subtypes ERα and β are not fully understood. In the present study, we used neonatal hippocampal slice cultures from female rats because these cultures synthesise oestradiol and express both receptor subtypes, and inhibition of oestradiol synthesis in these cultures results in spine synapse loss. Using electron microscopy, we tested the effects on spine synapse density in response to agonists of both ERα and ERβ. Application of agonists to the cultures had no effect. After inhibition of oestradiol synthesis, however, agonists of ERα induced spine synapse formation, whereas ERβ agonists led to a reduction in spine synapse density in the CA1 region of these cultures. Consistently, up-regulation of ERβ in the hippocampus of adult female aromatase-deficient mice is paralleled by hippocampus-specific spine synapse loss in this mutant. Finally, we found an increase in spine synapses in the adult female ERβ knockout mouse, but no effect in the adult female ERα knockout mouse. Our data suggest antagonistic roles of ERβ and ERα in spine synapse formation in the female hippocampus, which may contribute to oestrus cyclicity of spine synapse density in the hippocampus.
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Affiliation(s)
- L Zhou
- Institute of Neuroanatomy, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Klein RC, Saini S, Risher ML, Acheson SK, Fleming RL, Sexton HG, Swartzwelder HS, Moore SD. Regional-specific effects of ovarian hormone loss on synaptic plasticity in adult human APOE targeted replacement mice. PLoS One 2014; 9:e94071. [PMID: 24732142 PMCID: PMC3986067 DOI: 10.1371/journal.pone.0094071] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 03/11/2014] [Indexed: 12/27/2022] Open
Abstract
The human apolipoprotein ε4 allele (APOE4) has been implicated as one of the strongest genetic risk factors associated with Alzheimer’s disease (AD) and in influencing normal cognitive functioning. Previous studies have demonstrated that mice expressing human apoE4 display deficits in behavioral and neurophysiological outcomes compared to those with apoE3. Ovarian hormones have also been shown to be important in modulating synaptic processes underlying cognitive function, yet little is known about how their effects are influenced by apoE. In the current study, female adult human APOE targeted replacement (TR) mice were utilized to examine the effects of human APOE genotype and long-term ovarian hormone loss on synaptic plasticity in limbic regions by measuring dendritic spine density and electrophysiological function. No significant genotype differences were observed on any outcomes within intact mice. However, there was a significant main effect of genotype on total spine density in apical dendrites in the hippocampus, with post-hoc t-tests revealing a significant reduction in spine density in apoE3 ovariectomized (OVX) mice compared to sham operated mice. There was also a significant main effect of OVX on the magnitude of LTP, with post-hoc t-tests revealing a decrease in apoE3 OVX mice relative to sham. In contrast, apoE4 OVX mice showed increased synaptic activity relative to sham. In the lateral amygdala, there was a significant increase in total spine density in apoE4 OVX mice relative to sham. This increase in spine density was consistent with a significant increase in spontaneous excitatory activity in apoE4 OVX mice. These findings suggest that ovarian hormones differentially modulate synaptic integrity in an apoE-dependent manner within brain regions that are susceptible to neurophysiological dysfunction associated with AD.
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Affiliation(s)
- Rebecca C. Klein
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
- MIRECC, Durham Veterans Affairs Medical Center, Durham, North Carolina, United States of America
- * E-mail:
| | - Shyla Saini
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
| | - M-Louise Risher
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Shawn K. Acheson
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
- Neurobiology Research Lab, Durham Veterans Affairs Medical Center, Durham, North Carolina, United States of America
| | - Rebekah L. Fleming
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
- Neurobiology Research Lab, Durham Veterans Affairs Medical Center, Durham, North Carolina, United States of America
| | - Hannah G. Sexton
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
- Neurobiology Research Lab, Durham Veterans Affairs Medical Center, Durham, North Carolina, United States of America
| | - H. Scott Swartzwelder
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
- Neurobiology Research Lab, Durham Veterans Affairs Medical Center, Durham, North Carolina, United States of America
| | - Scott D. Moore
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, North Carolina, United States of America
- MIRECC, Durham Veterans Affairs Medical Center, Durham, North Carolina, United States of America
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Bayer J, Schultz H, Gamer M, Sommer T. Menstrual-cycle dependent fluctuations in ovarian hormones affect emotional memory. Neurobiol Learn Mem 2014; 110:55-63. [DOI: 10.1016/j.nlm.2014.01.017] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 01/23/2014] [Accepted: 01/25/2014] [Indexed: 02/02/2023]
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48
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Jayaraman A, Pike CJ. Differential effects of synthetic progestagens on neuron survival and estrogen neuroprotection in cultured neurons. Mol Cell Endocrinol 2014; 384:52-60. [PMID: 24424444 PMCID: PMC3954450 DOI: 10.1016/j.mce.2014.01.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 11/22/2013] [Accepted: 01/03/2014] [Indexed: 11/19/2022]
Abstract
Progesterone and other progestagens are used in combination with estrogens for clinical purposes, including contraception and postmenopausal hormone therapy. Progesterone and estrogens have interactive effects in brain, however interactions between synthetic progestagens and 17β-estradiol (E2) in neurons are not well understood. In this study, we investigated the effects of seven clinically relevant progestagens on estrogen receptor (ER) mRNA expression, E2-induced neuroprotection, and E2-induced BDNF mRNA expression. We found that medroxyprogesterone acetate decreased both ERα and ERβ expression and blocked E2-mediated neuroprotection and BDNF expression. Conversely, levonorgestrel and nesterone increased ERα and or ERβ expression, were neuroprotective, and failed to attenuate E2-mediated increases in neuron survival and BDNF expression. Other progestagens tested, including norethindrone, norethindrone acetate, norethynodrel, and norgestimate, had variable effects on the measured endpoints. Our results demonstrate a range of qualitatively different actions of progestagens in cultured neurons, suggesting significant variability in the neural effects of clinically utilized progestagens.
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Affiliation(s)
- Anusha Jayaraman
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089, USA
| | - Christian J Pike
- Davis School of Gerontology, University of Southern California, Los Angeles, CA 90089, USA.
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Giachero M, Calfa GD, Molina VA. Hippocampal structural plasticity accompanies the resulting contextual fear memory following stress and fear conditioning. Learn Mem 2013; 20:611-6. [DOI: 10.1101/lm.031724.113] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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50
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Bertrand SJ, Mactutus CF, Aksenova MV, Espensen-Sturges TD, Booze RM. Synaptodendritic recovery following HIV Tat exposure: neurorestoration by phytoestrogens. J Neurochem 2013; 128:140-51. [PMID: 23875777 DOI: 10.1111/jnc.12375] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Revised: 06/22/2013] [Accepted: 07/03/2013] [Indexed: 12/17/2022]
Abstract
HIV-1 infects the brain and, despite antiretroviral therapy, many infected individuals suffer from HIV-1-associated neurocognitive disorders (HAND). HAND is associated with dendritic simplification and synaptic loss. Prevention of synaptodendritic damage may ameliorate or forestall neurocognitive decline in latent HIV-1 infections. The HIV-1 transactivating protein (Tat) is produced during viral latency in the brain and may cause synaptodendritic damage. This study examined the integrity of the dendritic network after exposure to HIV-1 Tat by labeling filamentous actin (F-actin)-rich structures (puncta) in primary neuronal cultures. After 24 h of treatment, HIV-1 Tat was associated with the dendritic arbor and produced a significant reduction of F-actin-labeled dendritic puncta as well as loss of dendrites. Pre-treatment with either of two plant-derived phytoestrogen compounds (daidzein and liquiritigenin), significantly reduced synaptodendritic damage following HIV-1 Tat treatment. In addition, 6 days after HIV-1 Tat treatment, treatment with either daidzein, or liquiritigenin enhanced recovery, via the estrogen receptor, from HIV-1 Tat-induced synaptodendritic damage. These results suggest that either liquiritigenin or daidzein may not only attenuate acute synaptodendritic injury in HIV-1 but may also promote recovery from synaptodendritic damage. The HIV-1 transactivating protein (Tat) is produced during viral latency in the brain. Treatment with either daidzein or liquiritigenin restored the loss of synaptic connectivity produced by HIV-1 Tat. This neurorestoration was mediated by estrogen receptors (ER). These results suggest that plant-derived phytoestrogens may promote recovery from HIV-1-induced synaptodendritic damage.
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Affiliation(s)
- Sarah J Bertrand
- Laboratory Program in Behavioral Neuroscience, Department of Psychology, University of South Carolina, Columbia, South Carolina, USA
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