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Tozzi L, Garczarek L, Janowitz D, Stein DJ, Wittfeld K, Dobrowolny H, Lagopoulos J, Hatton SN, Hickie IB, Carballedo A, Brooks SJ, Vuletic D, Uhlmann A, Veer IM, Walter H, Bülow R, Völzke H, Klinger-König J, Schnell K, Schoepf D, Grotegerd D, Opel N, Dannlowski U, Kugel H, Schramm E, Konrad C, Kircher T, Jüksel D, Nenadić I, Krug A, Hahn T, Steinsträter O, Redlich R, Zaremba D, Zurowski B, Fu CH, Dima D, Cole J, Grabe HJ, Connolly CG, Yang TT, Ho TC, LeWinn KZ, Li M, Groenewold NA, Salminen LE, Walter M, Simmons AN, van Erp TG, Jahanshad N, Baune BT, van der Wee NJ, van Tol MJ, Penninx BW, Hibar DP, Thompson PM, Veltman DJ, Schmaal L, Frodl T. Interactive impact of childhood maltreatment, depression, and age on cortical brain structure: mega-analytic findings from a large multi-site cohort. Psychol Med 2020; 50:1020-1031. [PMID: 31084657 PMCID: PMC9254722 DOI: 10.1017/s003329171900093x] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Childhood maltreatment (CM) plays an important role in the development of major depressive disorder (MDD). The aim of this study was to examine whether CM severity and type are associated with MDD-related brain alterations, and how they interact with sex and age. METHODS Within the ENIGMA-MDD network, severity and subtypes of CM using the Childhood Trauma Questionnaire were assessed and structural magnetic resonance imaging data from patients with MDD and healthy controls were analyzed in a mega-analysis comprising a total of 3872 participants aged between 13 and 89 years. Cortical thickness and surface area were extracted at each site using FreeSurfer. RESULTS CM severity was associated with reduced cortical thickness in the banks of the superior temporal sulcus and supramarginal gyrus as well as with reduced surface area of the middle temporal lobe. Participants reporting both childhood neglect and abuse had a lower cortical thickness in the inferior parietal lobe, middle temporal lobe, and precuneus compared to participants not exposed to CM. In males only, regardless of diagnosis, CM severity was associated with higher cortical thickness of the rostral anterior cingulate cortex. Finally, a significant interaction between CM and age in predicting thickness was seen across several prefrontal, temporal, and temporo-parietal regions. CONCLUSIONS Severity and type of CM may impact cortical thickness and surface area. Importantly, CM may influence age-dependent brain maturation, particularly in regions related to the default mode network, perception, and theory of mind.
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Affiliation(s)
- Leonardo Tozzi
- Department of Psychiatry and Psychotherapy, Otto von Guericke University, Magdeburg, Germany
- Department of Psychiatry and Behavioral Sciences, Stanford University, California, USA
| | - Lisa Garczarek
- Department of Psychiatry and Psychotherapy, Otto von Guericke University, Magdeburg, Germany
| | - Deborah Janowitz
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Greifswald, Germany
| | - Dan J. Stein
- SAMRC Unit on Risk & Resilience in Mental Disorders, UCT Department of Psychiatry and Mental Health, Cape Town, South Africa
| | - Katharina Wittfeld
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Greifswald, Germany
- German Center for Neurodegenerative Diseases (DZNE), Site Rostock/Greifswald, Germany
| | - Henrik Dobrowolny
- Department of Psychiatry and Psychotherapy, Otto von Guericke University, Magdeburg, Germany
| | - Jim Lagopoulos
- Brain and Mind Centre, University of Sydney, Camperdown, Australia
- Sunshine Coast Mind and Neuroscience – Thompson Institute, Queensland, Australia
| | - Sean N. Hatton
- Brain and Mind Centre, University of Sydney, Camperdown, Australia
| | - Ian B. Hickie
- Brain and Mind Centre, University of Sydney, Camperdown, Australia
| | - Angela Carballedo
- Trinity College Institute of Neuroscience, Trinity College Dublin, Ireland
| | - Samantha J. Brooks
- SAMRC Unit on Risk & Resilience in Mental Disorders, UCT Department of Psychiatry and Mental Health, Cape Town, South Africa
- School of Natural Sciences and Psychology, Liverpool John Moores University, Liverpool, UK
| | - Daniella Vuletic
- SAMRC Unit on Risk & Resilience in Mental Disorders, UCT Department of Psychiatry and Mental Health, Cape Town, South Africa
| | - Anne Uhlmann
- SAMRC Unit on Risk & Resilience in Mental Disorders, UCT Department of Psychiatry and Mental Health, Cape Town, South Africa
- Department of Psychiatry, University of Vermont, Burlington, VT, USA
| | - Ilya M. Veer
- Division of Mind and Brain Research, Department of Psychiatry and Psychotherapy CCM, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - Henrik Walter
- Division of Mind and Brain Research, Department of Psychiatry and Psychotherapy CCM, Charité – Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - Robin Bülow
- Institute for Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Germany
| | - Henry Völzke
- Institute for Community Medicine, University Medicine Greifswald, and Center of Cardiovascular Research (DZHK), Germany, partner site Greifswald
| | - Johanna Klinger-König
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Greifswald, Germany
| | - Knut Schnell
- Department of General Psychiatry, University Hospital Heidelberg, Germany
- Department of Psychiatry and Psychotherapy, University Medical Center Göttingen, Göttingen, Germany
- Department of Psychiatry and Psychotherapy, Asklepios Fachklinikum Göttingen, Göttingen, Germany
| | - Dieter Schoepf
- Department of Psychiatry and Psychotherapy, University of Bonn, Germany, and Department of Psychiatry and Psychotherapy, Vitos Weil-Lahn, Hesse, Germany
| | - Dominik Grotegerd
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Nils Opel
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Udo Dannlowski
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Harald Kugel
- Institute of Clinical Radiology, University of Münster, Germany
| | - Elisabeth Schramm
- Department of Psychiatry and Psychotherapy, Medical Center, University of Freiburg, Germany
- Psychiatric University Clinic, Basel, Switzerland
| | - Carsten Konrad
- Department of Psychiatry and Psychotherapy, Agaplesion Diakoniklinikum, Rotenburg, Germany
- Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
| | - Tilo Kircher
- Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
| | - Dilara Jüksel
- Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
| | - Igor Nenadić
- Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
| | - Axel Krug
- Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
| | - Tim Hahn
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Olaf Steinsträter
- Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
- Core Facility Brain Imaging, Faculty of Medicine, Philipps-University of Marburg, Germany
| | - Ronny Redlich
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Dario Zaremba
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Bartosz Zurowski
- Center for Integrative Psychiatry, University of Lübeck, Lübeck, Germany
| | - Cynthia H.Y. Fu
- School of Psychology, College of Applied Health and Communities, University of East London, London, UK
- Centre for Affective Disorders, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - Danai Dima
- Department of Psychology, School of Arts and Social Sciences, City, University of London, London, UK
- Department of Neuroimaging, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
| | - James Cole
- Department of Psychology, School of Arts and Social Sciences, City, University of London, London, UK
| | - Hans J. Grabe
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Greifswald, Germany
| | - Colm G. Connolly
- Department of Psychiatry & Langley Porter Psychiatric Institute, UCSF Weill Institute for Neurosciences, University of California, San Francisco, USA
- Department of Biomedical Sciences, Florida State University Tallahassee, FL, USA
| | - Tony T. Yang
- Department of Psychiatry & Langley Porter Psychiatric Institute, UCSF Weill Institute for Neurosciences, University of California, San Francisco, USA
- Department of Psychiatry, Division of Child and Adolescent Psychiatry, University of California, San Francisco (UCSF), USA
| | - Tiffany C. Ho
- Department of Psychiatry & Langley Porter Psychiatric Institute, UCSF Weill Institute for Neurosciences, University of California, San Francisco, USA
- Department of Psychology and Department of Psychiatry & Behavioral Sciences, Stanford University, Stanford, CA, USA
| | - Kaja Z. LeWinn
- Department of Psychiatry & Langley Porter Psychiatric Institute, UCSF Weill Institute for Neurosciences, University of California, San Francisco, USA
- Department of Psychiatry, Division of Child and Adolescent Psychiatry, University of California, San Francisco (UCSF), USA
| | - Meng Li
- Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Nynke A. Groenewold
- SAMRC Unit on Risk & Resilience in Mental Disorders, UCT Department of Psychiatry and Mental Health, Cape Town, South Africa
| | - Lauren E. Salminen
- Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of University of California, Marina del Rey, CA, USA
| | - Martin Walter
- Department of Psychiatry and Psychotherapy, Otto von Guericke University, Magdeburg, Germany
- Leibniz Institute for Neurobiology, Magdeburg, Germany
- Department of Psychiatry and Psychotherapy, University of Tuebingen, Germany
| | - Alan N Simmons
- VA San Diego Healthcare, San Francisco, CA, USA
- School of Medicine, Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
| | - Theo G.M. van Erp
- Clinical Translational Neuroscience Laboratory, Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
| | - Neda Jahanshad
- Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of University of California, Marina del Rey, CA, USA
| | - Bernhard T. Baune
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
- Discipline of Psychiatry, School of Medicine, University of Adelaide, SA 5005 Adelaide, Australia
- Department of Psychiatry, Melbourne Medical School, The University of Melbourne, VIC 3010 Melbourne, Australia
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, Australia
| | - Nic J.A. van der Wee
- Department of Psychiatry, Leiden Institute for Brain and Cognition, Leiden University Medical Center, Leiden, The Netherlands
| | - Marie-Jose van Tol
- Department of Biomedical Sciences of Cells and Systems, Cognitive Neuroscience Center, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Brenda W.J.H. Penninx
- Department of Psychiatry and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - Derrek P. Hibar
- Clinical Translational Neuroscience Laboratory, Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
| | - Paul M. Thompson
- Imaging Genetics Center, Mark and Mary Stevens Neuroimaging and Informatics Institute, Keck School of Medicine of University of California, Marina del Rey, CA, USA
| | - Dick J. Veltman
- Department of Psychiatry and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - Lianne Schmaal
- Orygen, The National Centre of Excellence in Youth Mental Health, Melbourne, Australia
- Centre for Youth Mental Health, The University of Melbourne, Melbourne, Australia
| | - Thomas Frodl
- Department of Psychiatry and Psychotherapy, Otto von Guericke University, Magdeburg, Germany
- Brain and Mind Centre, University of Sydney, Camperdown, Australia
- German Center of Neurodegenerative Diseases (DZNE), Site Magdeburg, Germany
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Rodríguez-López C, Guerrero Molina M, Martínez Salio A. Rapidly progressive dementia as a form of presentation of Cushing syndrome. NEUROLOGÍA (ENGLISH EDITION) 2019. [DOI: 10.1016/j.nrleng.2016.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Morphological determinants of dendritic arborization neurons in Drosophila larva. Brain Struct Funct 2017; 223:1107-1120. [PMID: 29094302 DOI: 10.1007/s00429-017-1541-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Accepted: 10/19/2017] [Indexed: 01/08/2023]
Abstract
Pairing in vivo imaging and computational modeling of dendritic arborization (da) neurons from the fruit fly larva provides a unique window into neuronal growth and underlying molecular processes. We image, reconstruct, and analyze the morphology of wild-type, RNAi-silenced, and mutant da neurons. We then use local and global rule-based stochastic simulations to generate artificial arbors, and identify the parameters that statistically best approximate the real data. We observe structural homeostasis in all da classes, where an increase in size of one dendritic stem is compensated by a reduction in the other stems of the same neuron. Local rule models show that bifurcation probability is determined by branch order, while branch length depends on path distance from the soma. Global rule simulations suggest that most complex morphologies tend to be constrained by resource optimization, while simpler neuron classes privilege path distance conservation. Genetic manipulations affect both the local and global optimal parameters, demonstrating functional perturbations in growth mechanisms.
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The Effect of Glucocorticoid and Glucocorticoid Receptor Interactions on Brain, Spinal Cord, and Glial Cell Plasticity. Neural Plast 2017; 2017:8640970. [PMID: 28928988 PMCID: PMC5591892 DOI: 10.1155/2017/8640970] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 05/14/2017] [Indexed: 12/15/2022] Open
Abstract
Stress, injury, and disease trigger glucocorticoid (GC) elevation. Elevated GCs bind to the ubiquitously expressed glucocorticoid receptor (GR). While GRs are in every cell in the nervous system, the expression level varies, suggesting that diverse cell types react differently to GR activation. Stress/GCs induce structural plasticity in neurons, Schwann cells, microglia, oligodendrocytes, and astrocytes as well as affect neurotransmission by changing the release and reuptake of glutamate. While general nervous system plasticity is essential for adaptation and learning and memory, stress-induced plasticity is often maladaptive and contributes to neuropsychiatric disorders and neuropathic pain. In this brief review, we describe the evidence that stress/GCs activate GR to promote cell type-specific changes in cellular plasticity throughout the nervous system.
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Frodl T, Janowitz D, Schmaal L, Tozzi L, Dobrowolny H, Stein DJ, Veltman DJ, Wittfeld K, van Erp TG, Jahanshad N, Block A, Hegenscheid K, Völzke H, Lagopoulos J, Hatton SN, Hickie IB, Frey EM, Carballedo A, Brooks SJ, Vuletic D, Uhlmann A, Veer IM, Walter H, Schnell K, Grotegerd D, Arolt V, Kugel H, Schramm E, Konrad C, Zurowski B, Baune BT, van der Wee NJ, van Tol MJ, Penninx BW, Thompson PM, Hibar DP, Dannlowski U, Grabe HJ. Childhood adversity impacts on brain subcortical structures relevant to depression. J Psychiatr Res 2017; 86:58-65. [PMID: 27918926 PMCID: PMC5564511 DOI: 10.1016/j.jpsychires.2016.11.010] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 11/14/2016] [Accepted: 11/18/2016] [Indexed: 01/25/2023]
Abstract
Childhood adversity plays an important role for development of major depressive disorder (MDD). There are differences in subcortical brain structures between patients with MDD and healthy controls, but the specific impact of childhood adversity on such structures in MDD remains unclear. Thus, aim of the present study was to investigate whether childhood adversity is associated with subcortical volumes and how it interacts with a diagnosis of MDD and sex. Within the ENIGMA-MDD network, nine university partner sites, which assessed childhood adversity and magnetic resonance imaging in patients with MDD and controls, took part in the current joint mega-analysis. In this largest effort world-wide to identify subcortical brain structure differences related to childhood adversity, 3036 participants were analyzed for subcortical brain volumes using FreeSurfer. A significant interaction was evident between childhood adversity, MDD diagnosis, sex, and region. Increased exposure to childhood adversity was associated with smaller caudate volumes in females independent of MDD. All subcategories of childhood adversity were negatively associated with caudate volumes in females - in particular emotional neglect and physical neglect (independently from age, ICV, imaging site and MDD diagnosis). There was no interaction effect between childhood adversity and MDD diagnosis on subcortical brain volumes. Childhood adversity is one of the contributors to brain structural abnormalities. It is associated with subcortical brain abnormalities that are relevant to psychiatric disorders such as depression.
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Affiliation(s)
- Thomas Frodl
- Department of Psychiatry and Psychotherapy, Otto von Guericke University of Magdeburg, Germany; Department of Psychiatry, University of Dublin, Trinity College, Dublin, Ireland.
| | - Deborah Janowitz
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Germany
| | - Lianne Schmaal
- Department of Psychiatry and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands,Orygen, The National Centre of Excellence in Youth Mental Health, Melbourne, Australia,Centre for Youth Mental Health, The University of Melbourne, Melbourne, Australia
| | - Leonardo Tozzi
- Department of Psychiatry and Psychotherapy, Otto von Guericke University of Magdeburg, Germany,Department of Psychiatry, University of Dublin, Trinity College, Dublin, Ireland
| | - Henrik Dobrowolny
- Department of Psychiatry and Psychotherapy, Otto von Guericke University of Magdeburg, Germany
| | - Dan J. Stein
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa
| | - Dick J. Veltman
- Department of Psychiatry and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - Katharina Wittfeld
- German Center for Neurodegenerative Diseases (DZNE), Rostock, Greifswald, Germany
| | - Theo G.M. van Erp
- Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
| | - Neda Jahanshad
- Imaging Genetics Center, Department of Neurology, Keck School of Medicine, University of Southern California, Marina del Rey, CA, USA
| | - Andrea Block
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Germany,Sociology of Physical Activity and Health, Department of Health Sciences, University of Potsdam, Germany
| | - Katrin Hegenscheid
- Institute of Diagnostic Radiology and Neuroradiology, University Medicine Greifswald, Germany
| | - Henry Völzke
- Institute for Community Medicine, University Medicine Greifswald, Germany
| | - Jim Lagopoulos
- Brain and Mind Centre, University of Sydney, Camperdown, Australia,Sunshine Coast Mind and Neuroscience – Thompson Institute, University of The Sunshine Coast, QLD, Australia
| | - Sean N. Hatton
- Brain and Mind Centre, University of Sydney, Camperdown, Australia
| | - Ian B. Hickie
- Brain and Mind Centre, University of Sydney, Camperdown, Australia
| | - Eva Maria Frey
- Department of Psychiatry, University of Regensburg, Regensburg, Germany
| | - Angela Carballedo
- Department of Psychiatry and Psychotherapy, Otto von Guericke University of Magdeburg, Germany,Trinity College Institute of Neuroscience, Trinity College Dublin, Ireland
| | - Samantha J. Brooks
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa
| | - Daniella Vuletic
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa
| | - Anne Uhlmann
- Department of Psychiatry and Mental Health, University of Cape Town, South Africa
| | - Ilya M. Veer
- Charité Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Division of Mind and Brain Research, Berlin, Germany
| | - Henrik Walter
- Charité Universitätsmedizin Berlin, Department of Psychiatry and Psychotherapy, Division of Mind and Brain Research, Berlin, Germany
| | - Knut Schnell
- Department of General Psychiatry, University Hospital Heidelberg, Germany
| | - Dominik Grotegerd
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Volker Arolt
- Department of Psychiatry and Psychotherapy, University of Münster, Germany
| | - Harald Kugel
- Department of Clinical Radiology, University of Münster, Germany
| | - Elisabeth Schramm
- Department of Psychiatry and Psychotherapy, University Medical Center Freiburg, Germany,Psychiatric University Clinic, Basel, Switzerland
| | - Carsten Konrad
- Department of Psychiatry and Psychotherapy, Agaplesion Diakoniklinikum, Rotenburg, Germany,Department of Psychiatry and Psychotherapy, Philipps-University Marburg, Germany
| | - Bartosz Zurowski
- Center for Integrative Psychiatry, University of Lübeck, Lübeck, Germany
| | - Bernhard T. Baune
- Discipline of Psychiatry, School of Medicine, University of Adelaide, SA 5005 Adelaide, Australia
| | - Nic J.A. van der Wee
- Department of Psychiatry, Leiden Institute for Brain and Cognition and Leiden Center for Translational Neuroscience, Leiden, The Netherlands
| | - Marie-Jose van Tol
- Department of Neuroscience, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Brenda W.J.H. Penninx
- Department of Psychiatry and Neuroscience Campus Amsterdam, VU University Medical Center, Amsterdam, The Netherlands
| | - Paul M. Thompson
- Imaging Genetics Center, Department of Neurology, Keck School of Medicine, University of Southern California, Marina del Rey, CA, USA
| | - Derrek P. Hibar
- Imaging Genetics Center, Department of Neurology, Keck School of Medicine, University of Southern California, Marina del Rey, CA, USA
| | - Udo Dannlowski
- Department of Psychiatry and Psychotherapy, University of Münster, Germany,Department of Psychiatry, University of Marburg, Germany
| | - Hans J. Grabe
- Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Germany,German Center for Neurodegenerative Diseases (DZNE), Rostock, Greifswald, Germany,Helios Hospital Stralsund, Germany
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Conrad CD, Ortiz JB, Judd JM. Chronic stress and hippocampal dendritic complexity: Methodological and functional considerations. Physiol Behav 2016; 178:66-81. [PMID: 27887995 DOI: 10.1016/j.physbeh.2016.11.017] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 11/16/2016] [Accepted: 11/18/2016] [Indexed: 12/30/2022]
Abstract
The current understanding of how chronic stress impacts hippocampal dendritic arbor complexity and the subsequent relationship to hippocampal-dependent spatial memory is reviewed. A surge in reports investigating hippocampal dendritic morphology is occurring, but with wide variations in methodological detail being reported. Consequently, this review systematically outlines the basic neuroanatomy of relevant hippocampal features to help clarify how chronic stress or glucocorticoids impact hippocampal dendritic complexity and how these changes occur in parallel with spatial cognition. Chronic stress often leads to hippocampal CA3 apical dendritic retraction first with other hippocampal regions (CA3 basal dendrites, CA1, dentate gyrus, DG) showing dendritic retraction when chronic stress is sufficiently robust or long lasting. The stress-induced reduction in hippocampal CA3 apical dendritic arbor complexity often coincides with impaired hippocampal function, such as spatial learning and memory. Yet, when chronic stress ends and a post-stress recovery period ensues, the atrophied dendritic arbors and poor spatial abilities often improve. However, this process differs from a simple reversal of chronic stress-induced deficits. Recent reports suggest that this return to baseline-like functioning is uniquely different from non-stressed controls, emphasizing the need for further studies to enhance our understanding of how a history of stress subsequently alters an organism's spatial abilities. To provide a consistent framework for future studies, this review concludes with an outline for a quick and easy reference on points to consider when planning chronic stress studies with the goal of measuring hippocampal dendritic complexity and spatial ability.
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Affiliation(s)
- Cheryl D Conrad
- Department of Psychology, Arizona State University, Box 1104, Tempe, AZ 85287-1104, United States.
| | - J Bryce Ortiz
- Department of Psychology, Arizona State University, Box 1104, Tempe, AZ 85287-1104, United States
| | - Jessica M Judd
- Department of Psychology, Arizona State University, Box 1104, Tempe, AZ 85287-1104, United States
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7
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Rodríguez-López C, Guerrero Molina MP, Martínez Salio A. Rapidly progressing dementia as a form of presentation of Cushing syndrome. Neurologia 2016; 34:339-340. [PMID: 27780614 DOI: 10.1016/j.nrl.2016.09.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 09/15/2016] [Indexed: 10/20/2022] Open
Affiliation(s)
- C Rodríguez-López
- Servicio de Neurología, Hospital Universitario 12 de Octubre, Madrid, España.
| | - M P Guerrero Molina
- Servicio de Neurología, Hospital Universitario 12 de Octubre, Madrid, España
| | - A Martínez Salio
- Servicio de Neurología, Hospital Universitario 12 de Octubre, Madrid, España
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8
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Milior G, Lecours C, Samson L, Bisht K, Poggini S, Pagani F, Deflorio C, Lauro C, Alboni S, Limatola C, Branchi I, Tremblay ME, Maggi L. Fractalkine receptor deficiency impairs microglial and neuronal responsiveness to chronic stress. Brain Behav Immun 2016; 55:114-125. [PMID: 26231972 DOI: 10.1016/j.bbi.2015.07.024] [Citation(s) in RCA: 166] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 07/25/2015] [Accepted: 07/26/2015] [Indexed: 12/25/2022] Open
Abstract
Chronic stress is one of the most relevant triggering factors for major depression. Microglial cells are highly sensitive to stress and, more generally, to environmental challenges. However, the role of these brain immune cells in mediating the effects of stress is still unclear. Fractalkine signaling - which comprises the chemokine CX3CL1, mainly expressed by neurons, and its receptor CX3CR1, almost exclusively present on microglia in the healthy brain - has been reported to critically regulate microglial activity. Here, we investigated whether interfering with microglial function by deleting the Cx3cr1 gene affects the brain's response to chronic stress. To this purpose, we housed Cx3cr1 knockout and wild-type adult mice in either control or stressful environments for 2weeks, and investigated the consequences on microglial phenotype and interactions with synapses, synaptic transmission, behavioral response and corticosterone levels. Our results show that hampering neuron-microglia communication via the CX3CR1-CX3CL1 pathway prevents the effects of chronic unpredictable stress on microglial function, short- and long-term neuronal plasticity and depressive-like behavior. Overall, the present findings suggest that microglia-regulated mechanisms may underlie the differential susceptibility to stress and consequently the vulnerability to diseases triggered by the experience of stressful events, such as major depression.
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Affiliation(s)
- Giampaolo Milior
- Department of Physiology and Pharmacology, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, Italy
| | - Cynthia Lecours
- Axe Neurosciences, Centre de recherche du CHU de Québec, 2705, boulevard Laurier, Québec, Canada
| | - Louis Samson
- Axe Neurosciences, Centre de recherche du CHU de Québec, 2705, boulevard Laurier, Québec, Canada
| | - Kanchan Bisht
- Axe Neurosciences, Centre de recherche du CHU de Québec, 2705, boulevard Laurier, Québec, Canada
| | - Silvia Poggini
- Section of Behavioural Neurosciences, Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Rome, Italy
| | - Francesca Pagani
- Center for Life Nanoscience, Istituto Italiano di Tecnologia@Sapienza, Rome, Italy
| | - Cristina Deflorio
- Department of Physiology and Pharmacology, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, Italy; Département de Neuroscience, Institut Pasteur, Unité Neurobiologie Intégrative des Systèmes Cholinergiques, Paris Cedex 15, Paris, France
| | - Clotilde Lauro
- Department of Physiology and Pharmacology, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, Italy
| | - Silvia Alboni
- Department of Life Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Cristina Limatola
- Department of Physiology and Pharmacology, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, Italy; IRCCS Neuromed, Pozzilli, IS, Italy
| | - Igor Branchi
- Section of Behavioural Neurosciences, Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Rome, Italy
| | - Marie-Eve Tremblay
- Axe Neurosciences, Centre de recherche du CHU de Québec, 2705, boulevard Laurier, Québec, Canada.
| | - Laura Maggi
- Department of Physiology and Pharmacology, Istituto Pasteur-Fondazione Cenci Bolognetti, Sapienza University of Rome, Italy
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9
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High activity of the stress promoter contributes to susceptibility to stress in the tree shrew. Sci Rep 2016; 6:24905. [PMID: 27125313 PMCID: PMC4850381 DOI: 10.1038/srep24905] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 04/06/2016] [Indexed: 12/28/2022] Open
Abstract
Stress is increasingly present in everyday life in our fast-paced society and involved in the pathogenesis of many psychiatric diseases. Corticotrophin-releasing-hormone (CRH) plays a pivotal role in regulating the stress responses. The tree shrews are highly vulnerable to stress which makes them the promising animal models for studying stress responses. However, the mechanisms underlying their high stress-susceptibility remained unknown. Here we confirmed that cortisol was the dominate corticosteroid in tree shrew and was significantly increased after acute stress. Our study showed that the function of tree shrew CRH - hypothalamic-pituitary-adrenal (HPA) axis was nearly identical to human that contributed little to their hyper-responsiveness to stress. Using CRH transcriptional regulation analysis we discovered a peculiar active glucocorticoid receptor response element (aGRE) site within the tree shrew CRH promoter, which continued to recruit co-activators including SRC-1 (steroid receptor co-activator-1) to promote CRH transcription under basal or forskolin/dexamethasone treatment conditions. Basal CRH mRNA increased when the aGRE was knocked into the CRH promoter in human HeLa cells using CAS9/CRISPR. The aGRE functioned critically to form the "Stress promoter" that contributed to the higher CRH expression and susceptibility to stress. These findings implicated novel molecular bases of the stress-related diseases in specific populations.
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10
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Abstract
Glucocorticoid and glucocorticoid receptor (GC/GR) interactions alter numerous aspects of neuronal function. These consequences (e.g., anti-inflammatory vs. pro-inflammatory) can vary depending on the duration of GC exposure or central nervous system (CNS) injury model. In this review we discuss how GC/GR interactions impact neuronal recovery after a central or peripheral nerve injury and discuss how GC exposure duration can produce divergent CNS neuronal growth responses. Finally we consider how new findings on gender specific immune cell responses after a nerve injury could intersect with GC/GR interactions to impact pain processing.
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Affiliation(s)
- Kathryn M Madalena
- Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA; Department of Neuroscience, Wexner Medical Center at The Ohio State University, Columbus, OH, USA
| | - Jessica K Lerch
- Center for Brain and Spinal Cord Repair, The Ohio State University, Columbus, OH, USA; Department of Neuroscience, Wexner Medical Center at The Ohio State University, Columbus, OH, USA
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11
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Do (epi)genetics impact the brain in functional neurologic disorders? HANDBOOK OF CLINICAL NEUROLOGY 2016; 139:157-165. [DOI: 10.1016/b978-0-12-801772-2.00014-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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12
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Dhupia N, Rathour RK, Narayanan R. Dendritic atrophy constricts functional maps in resonance and impedance properties of hippocampal model neurons. Front Cell Neurosci 2015; 8:456. [PMID: 25628537 PMCID: PMC4289900 DOI: 10.3389/fncel.2014.00456] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Accepted: 12/16/2014] [Indexed: 11/23/2022] Open
Abstract
A gradient in the density of hyperpolarization-activated cyclic-nucleotide gated (HCN) channels is necessary for the emergence of several functional maps within hippocampal pyramidal neurons. Here, we systematically analyzed the impact of dendritic atrophy on nine such functional maps, related to input resistance and local/transfer impedance properties, using conductance-based models of hippocampal pyramidal neurons. We introduced progressive dendritic atrophy in a CA1 pyramidal neuron reconstruction through a pruning algorithm, measured all functional maps in each pruned reconstruction, and arrived at functional forms for the dependence of underlying measurements on dendritic length. We found that, across frequencies, atrophied neurons responded with higher efficiency to incoming inputs, and the transfer of signals across the dendritic tree was more effective in an atrophied reconstruction. Importantly, despite the presence of identical HCN-channel density gradients, spatial gradients in input resistance, local/transfer resonance frequencies and impedance profiles were significantly constricted in reconstructions with dendritic atrophy, where these physiological measurements across dendritic locations converged to similar values. These results revealed that, in atrophied dendritic structures, the presence of an ion channel density gradient alone was insufficient to sustain homologous functional maps along the same neuronal topograph. We assessed the biophysical basis for these conclusions and found that this atrophy-induced constriction of functional maps was mediated by an enhanced spatial spread of the influence of an HCN-channel cluster in atrophied trees. These results demonstrated that the influence fields of ion channel conductances need to be localized for channel gradients to express themselves as homologous functional maps, suggesting that ion channel gradients are necessary but not sufficient for the emergence of functional maps within single neurons.
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Affiliation(s)
- Neha Dhupia
- Cellular Neurophysiology Laboratory, Indian Institute of Science Bangalore, India ; Centre for Converging Technologies, University of Rajasthan Jaipur, India
| | - Rahul K Rathour
- Cellular Neurophysiology Laboratory, Indian Institute of Science Bangalore, India
| | - Rishikesh Narayanan
- Cellular Neurophysiology Laboratory, Indian Institute of Science Bangalore, India
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Hennebelle M, Champeil-Potokar G, Lavialle M, Vancassel S, Denis I. Omega-3 polyunsaturated fatty acids and chronic stress-induced modulations of glutamatergic neurotransmission in the hippocampus. Nutr Rev 2014; 72:99-112. [DOI: 10.1111/nure.12088] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Affiliation(s)
- Marie Hennebelle
- Department of Physiology and Biophysics; University of Sherbrooke; Sherbrooke Quebec Canada
| | - Gaëlle Champeil-Potokar
- INRA; Unité de Nutrition et Régulation Lipidiques des Fonctions Cérébrales; NuRéLiCe; UR909; Jouy en Josas France
| | - Monique Lavialle
- INRA; Unité de Nutrition et Régulation Lipidiques des Fonctions Cérébrales; NuRéLiCe; UR909; Jouy en Josas France
| | - Sylvie Vancassel
- INRA; Unité de Nutrition et Neurobiologie Intégrée; UMR1286; Bordeaux France
| | - Isabelle Denis
- INRA; Unité de Nutrition et Régulation Lipidiques des Fonctions Cérébrales; NuRéLiCe; UR909; Jouy en Josas France
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14
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Frodl T, Amico F. Is there an association between peripheral immune markers and structural/functional neuroimaging findings? Prog Neuropsychopharmacol Biol Psychiatry 2014; 48:295-303. [PMID: 23313563 DOI: 10.1016/j.pnpbp.2012.12.013] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 11/14/2012] [Accepted: 12/15/2012] [Indexed: 02/04/2023]
Abstract
OBJECTIVES There is mounting evidence that inflammatory processes play a key role in emotional as well as cognitive dysfunctions. In this context, research employing magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MR spectroscopy) suggests a possible link between structural/functional anomalies in the brain and an increase of circulating inflammation markers. The present paper reviews this research, with particular focus on major depressive disorder (MDD), cognitive impairment in older adults, Alzheimer's disease (AD) and schizophrenia. RESULTS In MDD, cognitive impairment and AD, inflammatory processes have been found to be associated with both structural and functional anomalies, perhaps under the influence of environmental stress. Not enough research can suggest similar considerations in schizophrenia, although studies in mice and non-human primates support the belief that inflammatory responses generated during pregnancy can affect brain development and contribute to the etiology of schizophrenia. CONCLUSIONS The present review suggests a link between inflammatory processes and MRI detected anomalies in the brain of individuals with MDD, older adults with cognitive impairment as well as of individuals with AD and schizophrenia.
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Affiliation(s)
- Thomas Frodl
- Department of Psychiatry, Trinity College Institute of Neuroscience, Trinity College, Dublin, Ireland; Adelaide and Meath incorporating the National's Children Hospital, Dublin, Ireland; St. James's Hospital, Dublin, Ireland.
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15
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Wang J, Chai A, Zhou Q, Lv L, Wang L, Yang Y, Xu L. Chronic clomipramine treatment reverses core symptom of depression in subordinate tree shrews. PLoS One 2013; 8:e80980. [PMID: 24312510 PMCID: PMC3846567 DOI: 10.1371/journal.pone.0080980] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 10/18/2013] [Indexed: 11/20/2022] Open
Abstract
Chronic stress is the major cause of clinical depression. The behavioral signs of depression, including anhedonia, learning and memory deficits, and sleep disruption, result from the damaging effects of stress hormones on specific neural pathways. The Chinese tree shrew (Tupaia belangeri chinensis) is an aggressive non-human primate with a hierarchical social structure that has become a well-established model of the behavioral, endocrine, and neurobiological changes associated with stress-induced depression. The tricyclic antidepressant clomipramine treats many of the core symptoms of depression in humans. To further test the validity of the tree shrew model of depression, we examined the effects of clomipramine on depression-like behaviors and physiological stress responses induced by social defeat in subordinate tree shrews. Social defeat led to weight loss, anhedonia (as measured by sucrose preference), unstable fluctuations in locomotor activity, sustained urinary cortisol elevation, irregular cortisol rhythms, and deficient hippocampal long-term potentiation (LTP). Clomipramine ameliorated anhedonia and irregular locomotor activity, and partially rescued the irregular cortisol rhythm. In contrast, weight loss increased, cortisol levels were even higher, and in vitro LTP was still impaired in the clomipramine treatment group. These results demonstrate the unique advantage of the tree shrew social defeat model of depression.
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Affiliation(s)
- Jing Wang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Science & Yunnan Province, and Laboratory of Learning and Memory, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- Kunming College of Life Science, University of Chinese Academy of Science, Beijing, China
| | - Anping Chai
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Science & Yunnan Province, and Laboratory of Learning and Memory, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- Kunming College of Life Science, University of Chinese Academy of Science, Beijing, China
| | - Qixin Zhou
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Science & Yunnan Province, and Laboratory of Learning and Memory, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
| | - Longbao Lv
- Kunming Primate Research Center of Chinese Academy of Sciences, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
| | - Liping Wang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Science & Yunnan Province, and Laboratory of Learning and Memory, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
| | - Yuexiong Yang
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Science & Yunnan Province, and Laboratory of Learning and Memory, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- * E-mail: (LX); (YY)
| | - Lin Xu
- Key Laboratory of Animal Models and Human Disease Mechanisms of Chinese Academy of Science & Yunnan Province, and Laboratory of Learning and Memory, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- KIZ/CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
- * E-mail: (LX); (YY)
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16
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Joëls M, Sarabdjitsingh RA, Karst H. Unraveling the Time Domains of Corticosteroid Hormone Influences on Brain Activity: Rapid, Slow, and Chronic Modes. Pharmacol Rev 2012; 64:901-38. [DOI: 10.1124/pr.112.005892] [Citation(s) in RCA: 305] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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17
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Abstract
Stress is known to activate distinct neuronal circuits in the brain and induce multiple changes on the cellular level, including alterations in neuronal structures. On the basis of clinical observations that stress often precipitates a depressive disease, chronic psychosocial stress serves as an experimental model to evaluate the cellular and molecular alterations associated with the consequences of major depression. Antidepressants are presently believed to exert their primary biochemical effects by readjusting aberrant intrasynaptic concentrations of neurotransmitters, such as serotonin or noradrenaline, suggesting that imbalances viihin the monoaminergic systems contribute to the disorder (monoaminergic hypothesis of depression). Here, we reviev the results that comprise our understanding of stressful experience on cellular processes, with particular focus on the monoaminergic systems and structural changes within brain target areas of monoaminergic neurons.
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Affiliation(s)
- Eberhard Fuchs
- Clinical Neurobiology Laboratory, German Primate Center, Göttingen, Germany
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18
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Atchley D, Hankosky ER, Gasparotto K, Rosenkranz JA. Pharmacological enhancement of calcium-activated potassium channel function reduces the effects of repeated stress on fear memory. Behav Brain Res 2012; 232:37-43. [PMID: 22487247 DOI: 10.1016/j.bbr.2012.03.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Revised: 03/01/2012] [Accepted: 03/23/2012] [Indexed: 12/17/2022]
Abstract
Repeated stress impacts emotion, and can induce mood and anxiety disorders. These disorders are characterized by imbalance of emotional responses. The amygdala is fundamental in expression of emotion, and is hyperactive in many patients with mood or anxiety disorders. Stress also leads to hyperactivity of the amygdala in humans. In rodent studies, repeated stress causes hyperactivity of the amygdala, and increases fear conditioning behavior that is mediated by the basolateral amygdala (BLA). Calcium-activated potassium (K(Ca)) channels regulate BLA neuronal activity, and evidence suggests reduced small conductance K(Ca) (SK) channel function in male rats exposed to repeated stress. Pharmacological enhancement of SK channels reverses the BLA neuronal hyperexcitability caused by repeated stress. However, it is not known if pharmacological targeting of SK channels can repair the effects of repeated stress on amygdala-dependent behaviors. The purpose of this study was to test whether enhancement of SK channel function reverses the effects of repeated restraint on BLA-dependent auditory fear conditioning. We found that repeated restraint stress increased the expression of cued conditioned fear in male rats. However, 1-Ethyl-2-benzimidazolinone (1-EBIO, 1 or 10 mg/kg) or CyPPA (5 mg/kg) administered 30 min prior to testing of fear expression brought conditioned freezing to control levels, with little impact on fear expression in control handled rats. These results demonstrate that enhancement of SK channel function can reduce the abnormalities of BLA-dependent fear memory caused by repeated stress. Furthermore, this indicates that pharmacological targeting of SK channels may provide a novel target for alleviation of psychiatric symptoms associated with amygdala hyperactivity.
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Affiliation(s)
- Derek Atchley
- Department of Cellular, Molecular Pharmacology, The Chicago Medical School, Rosalind Franklin University, North Chicago, IL 60064, USA
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19
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Schnell C, Janc OA, Kempkes B, Callis CA, Flügge G, Hülsmann S, Müller M. Restraint Stress Intensifies Interstitial K(+) Accumulation during Severe Hypoxia. Front Pharmacol 2012; 3:53. [PMID: 22470344 PMCID: PMC3314232 DOI: 10.3389/fphar.2012.00053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Accepted: 03/12/2012] [Indexed: 11/23/2022] Open
Abstract
Chronic stress affects neuronal networks by inducing dendritic retraction, modifying neuronal excitability and plasticity, and modulating glial cells. To elucidate the functional consequences of chronic stress for the hippocampal network, we submitted adult rats to daily restraint stress for 3 weeks (6 h/day). In acute hippocampal tissue slices of stressed rats, basal synaptic function and short-term plasticity at Schaffer collateral/CA1 neuron synapses were unchanged while long-term potentiation was markedly impaired. The spatiotemporal propagation pattern of hypoxia-induced spreading depression episodes was indistinguishable among control and stress slices. However, the duration of the extracellular direct current potential shift was shortened after stress. Moreover, K+ fluxes early during hypoxia were more intense, and the postsynaptic recoveries of interstitial K+ levels and synaptic function were slower. Morphometric analysis of immunohistochemically stained sections suggested hippocampal shrinkage in stressed rats, and the number of cells that are immunoreactive for glial fibrillary acidic protein was increased in the CA1 subfield indicating activation of astrocytes. Western blots showed a marked downregulation of the inwardly rectifying K+ channel Kir4.1 in stressed rats. Yet, resting membrane potentials, input resistance, and K+-induced inward currents in CA1 astrocytes were indistinguishable from controls. These data indicate an intensified interstitial K+ accumulation during hypoxia in the hippocampus of chronically stressed rats which seems to arise from a reduced interstitial volume fraction rather than impaired glial K+ buffering. One may speculate that chronic stress aggravates hypoxia-induced pathophysiological processes in the hippocampal network and that this has implications for the ischemic brain.
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Affiliation(s)
- Christian Schnell
- DFG Research Center Molecular Physiology of the Brain, Georg-August-Universität Göttingen Göttingen, Germany
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20
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Langenecker SA, Weisenbach SL, Giordani B, Briceño EM, Guidotti Breting LM, Schallmo MP, Leon HM, Noll DC, Zubieta JK, Schteingart DE, Starkman MN. Impact of chronic hypercortisolemia on affective processing. Neuropharmacology 2011; 62:217-25. [PMID: 21787793 DOI: 10.1016/j.neuropharm.2011.07.006] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2011] [Revised: 07/05/2011] [Accepted: 07/07/2011] [Indexed: 11/19/2022]
Abstract
Cushing syndrome (CS) is the classic condition of cortisol dysregulation, and cortisol dysregulation is the prototypic finding in Major Depressive Disorder (MDD). We hypothesized that subjects with active CS would show dysfunction in frontal and limbic structures relevant to affective networks, and also manifest poorer facial affect identification accuracy, a finding reported in MDD. Twenty-one patients with confirmed CS (20 ACTH-dependent and 1 ACTH-independent) were compared to 21 healthy control subjects. Identification of affective facial expressions (Facial Emotion Perception Test) was conducted in a 3 Tesla GE fMRI scanner using BOLD fMRI signal. The impact of disease (illness duration, current hormone elevation and degree of disruption of circadian rhythm), performance, and comorbid conditions secondary to hypercortisolemia were evaluated. CS patients made more errors in categorizing facial expressions and had less activation in left anterior superior temporal gyrus, a region important in emotion processing. CS patients showed higher activation in frontal, medial, and subcortical regions relative to controls. Two regions of elevated activation in CS, left middle frontal and lateral posterior/pulvinar areas, were positively correlated with accuracy in emotion identification in the CS group, reflecting compensatory recruitment. In addition, within the CS group, greater activation in left dorsal anterior cingulate was related to greater severity of hormone dysregulation. In conclusion, cortisol dysregulation in CS patients is associated with problems in accuracy of affective discrimination and altered activation of brain structures relevant to emotion perception, processing and regulation, similar to the performance decrements and brain regions shown to be dysfunctional in MDD. This article is part of a Special Issue entitled 'Anxiety and Depression'.
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Affiliation(s)
- Scott A Langenecker
- Department of Psychiatry, University of Michigan Medical Center, 2101 Commonwealth Blvd., Suite C., Ann Arbor, MI 48105, USA.
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Kerr CC, Kemp AH, Rennie CJ, Robinson PA. Thalamocortical changes in major depression probed by deconvolution and physiology-based modeling. Neuroimage 2011; 54:2672-82. [PMID: 21073966 DOI: 10.1016/j.neuroimage.2010.11.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2010] [Revised: 10/22/2010] [Accepted: 11/01/2010] [Indexed: 10/18/2022] Open
Abstract
Auditory event-related potentials (ERPs) have been extensively studied in patients with depression, but most studies have focused on purely phenomenological analysis methods, such as component scoring. In contrast, this study applies two recently developed physiology-based methods-fitting using a thalamocortical model of neuronal activity and waveform deconvolution - to data from a selective-attention task in four subject groups (49 patients with melancholic depression, 34 patients with non-melancholic depression, 111 participants with subclinical depressed mood, and 98 healthy controls), to yield insight into physiological differences in attentional processing between participants with major depression and controls. This approach found evidence that: participants with depressed mood, regardless of clinical status, shift from excitation in the thalamocortical system towards inhibition; that clinically depressed participants have decreased relative response amplitude between target and standard waveforms; and that patients with melancholic depression also have increased thalamocortical delays. These findings suggest possible physiological mechanisms underlying different depression subtypes, and may eventually prove useful in motivating new physiology-based diagnostic methods.
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Affiliation(s)
- Cliff C Kerr
- School of Physics, University of Sydney, New South Wales, Australia.
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22
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Opposite effects of early maternal deprivation on neurogenesis in male versus female rats. PLoS One 2009; 4:e3675. [PMID: 19180242 PMCID: PMC2629844 DOI: 10.1371/journal.pone.0003675] [Citation(s) in RCA: 153] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2008] [Accepted: 10/14/2008] [Indexed: 12/16/2022] Open
Abstract
Background Major depression is more prevalent in women than in men. The underlying neurobiological mechanisms are not well understood, but recent data shows that hippocampal volume reductions in depressed women occur only when depression is preceded by an early life stressor. This underlines the potential importance of early life stress, at least in women, for the vulnerability to develop depression. Perinatal stress exposure in rodents affects critical periods of brain development that persistently alter structural, emotional and neuroendocrine parameters in adult offspring. Moreover, stress inhibits adult hippocampal neurogenesis, a form of structural plasticity that has been implicated a.o. in antidepressant action and is highly abundant early postnatally. We here tested the hypothesis that early life stress differentially affects hippocampal structural plasticity in female versus male offspring. Principal Findings We show that 24 h of maternal deprivation (MD) at PND3 affects hippocampal structural plasticity at PND21 in a sex-dependent manner. Neurogenesis was significantly increased in male but decreased in female offspring after MD. Since no other structural changes were found in granule cell layer volume, newborn cell survival or proliferation rate, astrocyte number or gliogenesis, this indicates that MD elicits specific changes in subsets of differentiating cells and differentially affects immature neurons. The MD induced sex-specific effects on neurogenesis cannot be explained by differences in maternal care. Conclusions Our data shows that early environment has a critical influence on establishing sex differences in neural plasticity and supports the concept that the setpoint for neurogenesis may be determined during perinatal life. It is tempting to speculate that a reduced level of neurogenesis, secondary to early stress exposure, may contribute to maladaptation of the HPA axis and possibly to the increased vulnerability of women to stress-related disorders.
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Guldiken S, Guldiken B. Subclinical Cushing's syndrome is a potential cause of metabolic dementia and rapidly progressive Alzheimer-type dementia. Med Hypotheses 2008; 71:703-5. [PMID: 18801622 DOI: 10.1016/j.mehy.2008.05.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2008] [Revised: 05/29/2008] [Accepted: 05/30/2008] [Indexed: 10/21/2022]
Abstract
Excess of glucocorticoid hormones are found to exert deleterious effects on the structure and function of central nervous system, especially the hippocampus. This is manifested as mental and mood changes in Cushing syndrome. Subclinical Cushing's syndrome (SCS) is much more prevalent than Cushing's syndrome, and presents with increased plasma cortisol levels, but lack of the cardinal manifestations of Cushing's syndrome. In dementia, the impairment of hypothalamic-pituitary-adrenal axis has been shown, and hypercortisolism has been accused for rapidly progressive cognitive decline in Alzheimer disease. We hypothesized that SCS may cause metabolic dementia, and should be searched in case of rapidly progressive dementia of Alzheimer type.
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Affiliation(s)
- Sibel Guldiken
- Department of Endocrinology, Trakya University, Medical Faculty, Edirne 22030, Turkey.
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Cai Q, Huang S, Zhu Z, Li H, Li Q, Jia N, Liu J. The effects of prenatal stress on expression of p38 MAPK in offspring hippocampus. Int J Dev Neurosci 2008; 26:535-40. [DOI: 10.1016/j.ijdevneu.2008.06.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2008] [Revised: 06/03/2008] [Accepted: 06/03/2008] [Indexed: 10/21/2022] Open
Affiliation(s)
- Qing Cai
- Tianjin University of Traditional Chinese MedicineTianjin300193PR China
| | - Shuyun Huang
- Tianjin University of Traditional Chinese MedicineTianjin300193PR China
| | - Zhongliang Zhu
- College of Life Science, Northwest UniversityXi'anShaan xi710069PR China
- Department of Physiology and PathophysiologySchool of Medicine, Xi'an Jiaotong UniversityXi'anShaan xi710061PR China
| | - Hui Li
- Department of PediatricsXi'an Jiaotong University First HospitalXi'anPR China
| | - Qinghong Li
- Department of PediatricsXi'an Jiaotong University First HospitalXi'anPR China
| | - Ning Jia
- Department of Physiology and PathophysiologySchool of Medicine, Xi'an Jiaotong UniversityXi'anShaan xi710061PR China
| | - Jankang Liu
- Institute for Nutritional Sciences, Chinese Academy of SciencesShanghai200031PR China
- Institute for Brain Aging, University of CaliforniaIrvineCA92796United States
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25
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Hemond P, Epstein D, Boley A, Migliore M, Ascoli GA, Jaffe DB. Distinct classes of pyramidal cells exhibit mutually exclusive firing patterns in hippocampal area CA3b. Hippocampus 2008; 18:411-24. [PMID: 18189311 DOI: 10.1002/hipo.20404] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
It is thought that CA3 pyramidal neurons communicate mainly through bursts of spikes rather than so-called trains of regular firing action potentials. Reports of both burst firing and nonburst firing CA3 cells suggest that they may fire with more than one output pattern. With the use of whole-cell recording methods we studied the firing properties of rat hippocampal pyramidal neurons in vitro within the CA3b subregion and found three distinct types of firing patterns. Approximately 37% of cells were regular firing where spikes generated by minimal current injection (rheobase) were elicited with a short latency and with stronger current intensities trains of spikes exhibited spike frequency adaptation (SFA). Another 46% of neurons exhibited a delayed onset at rheobase with a weakly-adapting firing pattern upon stronger stimulation. The remaining 17% of cells showed a burst-firing pattern, though only elicited in response to strong current injection and spontaneous bursts were never observed. Control experiments indicated that the distinct firing patterns were not due to our particular slicing methods or recording techniques. Finally, computer modeling was used to identify how relative differences in K+ conductances, specifically K(C), K(M), and K(D), between cells contribute to the different characteristics of the three types of firing patterns observed experimentally.
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Affiliation(s)
- Peter Hemond
- Department of Biology, The University of Texas at San Antonio, San Antonio, Texas 78249, USA
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Karst H, Joëls M. Brief RU 38486 treatment normalizes the effects of chronic stress on calcium currents in rat hippocampal CA1 neurons. Neuropsychopharmacology 2007; 32:1830-9. [PMID: 17228340 DOI: 10.1038/sj.npp.1301296] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Chronic stress alters many properties in rat brain, like serotonin responsiveness and dendritic morphology. In the present study, we examined (i) whether unpredictable stress during 21 days affects calcium (Ca) currents of CA1 pyramidal neurons recorded on day 22; and (ii) if so, whether this change is normalized by treatment with the glucocorticoid receptor-antagonist RU 38486 during days 18-21. At 3 weeks of unpredictable stress increased the amplitude of the peak and sustained calcium current components, determined in hippocampal slices prepared from animals under rest (ie, with low corticosterone levels). The increased Ca-current amplitude was associated with an enhanced cell capacitance; current density was not significantly affected by chronic stress. In slices from stressed rats that received RU 38486, no stress-induced enhancement of calcium current amplitude was seen, while RU 38486 by itself did not alter calcium currents in handled controls. We confirmed earlier observations that brief in vitro treatment with 100 nM corticosterone, thus substantially activating the low-affinity glucocorticoid receptors, increases Ca-current amplitude recorded 1-4 h later in slices from naïve rats. However, Ca-current amplitude was not affected by corticosterone applied to slices from handled controls and currents were even decreased by corticosterone given to slices from chronically stressed rats, suggesting that corticosterone effects depend on the history of the animal. In conclusion, the data indicate that chronic stress, RU 38486 treatment as well as acute rises in corticosterone level strongly modulate calcium influx into CA1 neurons. This could have consequences for the viability of these neurons.
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Affiliation(s)
- Henk Karst
- SILS-CNS, University of Amsterdam, Amsterdam, The Netherlands.
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27
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Joëls M, Karst H, Krugers HJ, Lucassen PJ. Chronic stress: implications for neuronal morphology, function and neurogenesis. Front Neuroendocrinol 2007; 28:72-96. [PMID: 17544065 DOI: 10.1016/j.yfrne.2007.04.001] [Citation(s) in RCA: 277] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2007] [Revised: 04/12/2007] [Accepted: 04/20/2007] [Indexed: 12/19/2022]
Abstract
In normal life, organisms are repeatedly exposed to brief periods of stress, most of which can be controlled and adequately dealt with. The presently available data indicate that such brief periods of stress have little influence on the shape of neurons or adult neurogenesis, yet change the physiological function of cells in two time-domains. Shortly after stress excitability in limbic areas is rapidly enhanced, but also in brainstem neurons which produce catecholamines; collectively, during this phase the stress hormones promote focused attention, alertness, vigilance and the initial steps in encoding of information linked to the event. Later on, when the hormone concentrations are back to their pre-stress level, gene-mediated actions by corticosteroids reverse and normalize the enhanced excitability, an adaptive response meant to curtail defense reactions against stressors and to enable further storage of relevant information. When stress is experienced repetitively in an uncontrollable and unpredictable manner, a cascade of processes in brain is started which eventually leads to profound, region-specific alterations in dendrite and spine morphology, to suppression of adult neurogenesis and to inappropriate functional responses to a brief stress exposure including a sensitized activation phase and inadequate normalization of brain activity. Although various compounds can effectively prevent these cellular changes by chronic stress, the exact mechanism by which the effects are accomplished is poorly understood. One of the challenges for future research is to link the cellular changes seen in animal models for chronic stress to behavioral effects and to understand the risks they can impose on humans for the precipitation of stress-related disorders.
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Affiliation(s)
- Marian Joëls
- SILS-CNS, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands.
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28
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Fenoglio KA, Brunson KL, Baram TZ. Hippocampal neuroplasticity induced by early-life stress: functional and molecular aspects. Front Neuroendocrinol 2006; 27:180-92. [PMID: 16603235 PMCID: PMC2937188 DOI: 10.1016/j.yfrne.2006.02.001] [Citation(s) in RCA: 159] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2005] [Revised: 02/11/2006] [Accepted: 02/13/2006] [Indexed: 12/16/2022]
Abstract
Whereas genetic factors contribute crucially to brain function, early-life events, including stress, exert long-lasting influence on neuronal function. Here, we focus on the hippocampus as the target of these early-life events because of its crucial role in learning and memory. Using a novel immature-rodent model, we describe the deleterious consequences of chronic early-life 'psychological' stress on hippocampus-dependent cognitive tasks. We review the cellular mechanisms involved and discuss the roles of stress-mediating molecules, including corticotropin releasing hormone, in the process by which stress impacts the structure and function of hippocampal neurons.
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Affiliation(s)
- Kristina A. Fenoglio
- Department of Anatomy/Neurobiology, University of California at Irvine, Irvine, CA 92697-4475, USA
| | - Kristen L. Brunson
- Department of Anatomy/Neurobiology, University of California at Irvine, Irvine, CA 92697-4475, USA
| | - Tallie Z. Baram
- Department of Anatomy/Neurobiology, University of California at Irvine, Irvine, CA 92697-4475, USA
- Department of Pediatrics, University of California at Irvine, Irvine, CA 92697-4475, USA
- Corresponding author. Fax: +1 949 824 1106. (T.Z. Baram)
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29
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Abstract
Neurons have significant potential for the homeostatic regulation of a broad range of functional features, from gene expression to synaptic excitability. In this article, we show that dendritic morphology may also be under intrinsic homeostatic control. We present the results from a statistical analysis of a large collection of digitally reconstructed neurons, demonstrating that fluctuations in dendritic size in one given portion of a neuron are systematically counterbalanced by the remaining dendrites in the same cell. As a result, the total dendritic measure (e.g., number of branches, length, and surface area) of each neuron in a given morphological class is, on average, significantly less random than would be expected if trees (and their parts) were regulated independently during development. This observation is general across scales that range from gross basal/apical subdivisions to individual branches and bifurcations, and its statistical significance is robust among various brain regions, cell types, and experimental conditions. Given the pivotal dendritic role in signal integration, synaptic plasticity, and network connectivity, these findings add a dimension to the functional characterization of neuronal homeostasis.
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Affiliation(s)
- Alexei V Samsonovich
- Krasnow Institute for Advanced Study and Department of Psychology, George Mason University, Fairfax, VA 22030, USA
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Czéh B, Pudovkina O, van der Hart MGC, Simon M, Heilbronner U, Michaelis T, Watanabe T, Frahm J, Fuchs E. Examining SLV-323, a novel NK1 receptor antagonist, in a chronic psychosocial stress model for depression. Psychopharmacology (Berl) 2005; 180:548-57. [PMID: 15726334 DOI: 10.1007/s00213-005-2184-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2004] [Accepted: 01/04/2005] [Indexed: 10/25/2022]
Abstract
RATIONALE Substance P antagonists have been proposed as candidates for a new class of antidepressant compounds. OBJECTIVES We examined the effects of SLV-323, a novel neurokinin 1 receptor (NK1R) antagonist, in the chronic psychosocial stress paradigm of adult male tree shrews. METHODS Animals were subjected to a 7 day period of psychosocial stress before being treated daily with SLV-323 (20 mg kg(-1) day(-1)). The psychosocial stress continued throughout the treatment period of 28 days. Brain metabolite concentrations were determined in vivo by proton magnetic resonance spectroscopy. Norepinephrine excretion was monitored from daily urine samples, and serum testosterone concentrations were measured at the end of the experiment. All animals were videotaped daily to analyze scent-marking behavior and locomotor activity. Cell proliferation in the dentate gyrus and hippocampal volume were measured postmortem. RESULTS Stress significantly decreased cerebral concentrations of N-acetyl-aspartate, total creatine, and choline-containing compounds in vivo and resulted in an increase of urinary norepinephrine and decrease of serum testosterone concentrations. Moreover, stressed animals displayed decreased scent-marking behavior and locomotor activity. The proliferation rate of the granule precursor cells in the dentate gyrus was reduced, and hippocampal volume was mildly decreased. The stress-induced alterations in the central nervous system were partially prevented by concomitant administration of SLV-323, while drug treatment had only a minor effect on the stress-induced behavioral changes. CONCLUSIONS The novel NK1R antagonist SLV-323 has certain antidepressant-like effects in a valid animal model of depression.
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Affiliation(s)
- Boldizsár Czéh
- Clinical Neurobiology Laboratory, German Primate Center, Kellnerweg 4, 37077 Göttingen, Germany.
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31
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Alfonso J, Frasch AC, Flugge G. Chronic stress, depression and antidepressants: effects on gene transcription in the hippocampus. Rev Neurosci 2005; 16:43-56. [PMID: 15810653 DOI: 10.1515/revneuro.2005.16.1.43] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Depressive disorders are among the most frequent forms of mental illness. Both genetic and environmental factors, such as stress, are involved in the etiology of depression. Therefore, chronic stress paradigms in laboratory animals constitute an important tool for research in this field. The molecular bases of chronic stress/depression are largely unknown, although a large amount of information has been accumulated during recent years. Dysregulation of the hypothalamic-pituitary-adrenal (HPA) axis as well as structural and physiological alterations in the hippocampus and neocortex are known to occur. Modifications in the expression level of some genes, such as brain-derived neurotrophic factor, cAMP-response-element binding protein, serotonin receptors and HPA axis components were consistently associated in a number of experimental models. However, recent results suggest that several synaptic proteins, transcription factors and proteins involved in neuronal growth/differentiation, are also modified in their expression in experimental models of chronic stress. In general, these alterations can be reversed by treatment with antidepressants. Thus, a complex pattern of gene expression leading to stress/depression is starting to emerge. We summarize here recent findings on the alterations of gene expression in the hippocampus of chronically stressed and antidepressant treated animals.
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Affiliation(s)
- Julieta Alfonso
- Instituto de Investigaciones Biotecnológicas, Instituto Tecnológico de Chascomús, CONICET, Universidad Nacional de General San Martín, San Martín, Argentina.
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Czeh B, Simon M, van der Hart MG, Schmelting B, Hesselink MB, Fuchs E. Chronic stress decreases the number of parvalbumin-immunoreactive interneurons in the hippocampus: prevention by treatment with a substance P receptor (NK1) antagonist. Neuropsychopharmacology 2005; 30:67-79. [PMID: 15470372 DOI: 10.1038/sj.npp.1300581] [Citation(s) in RCA: 106] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Previous studies have demonstrated that stress may affect the hippocampal GABAergic system. Here, we examined whether long-term psychosocial stress influenced the number of parvalbumin-containing GABAergic cells, known to provide the most powerful inhibitory input to the perisomatic region of principal cells. Adult male tree shrews were submitted to 5 weeks of stress, after which immunocytochemical and quantitative stereological techniques were used to estimate the total number of hippocampal parvalbumin-immunoreactive (PV-IR) neurons. Stress significantly decreased the number of PV-IR cells in the dentate gyrus (DG) (-33%), CA2 (-28%), and CA3 (-29%), whereas the CA1 was not affected. Additionally, we examined whether antidepressant treatment offered protection from this stress-induced effect. We administered fluoxetine (15 mg/kg per day) and SLV-323 (20 mg/kg per day), a novel neurokinin 1 receptor (NK1R) antagonist, because the NK1R has been proposed as a possible target for novel antidepressant therapies. Animals were subjected to a 7-day period of psychosocial stress before the onset of daily oral administration of the drugs, with stress continued throughout the 28-day treatment period. NK1R antagonist administration completely prevented the stress-induced reduction of the number of PV-IR interneurons, whereas fluoxetine attenuated this decrement in the DG, without affecting the CA2 and CA3. The effect of stress on interneuron numbers may reflect real cell loss; alternatively, parvalbumin concentration is diminished in the neurons, which might indicate a compensatory attempt. In either case, antidepressant treatment offered protection from the effect of stress and appears to modulate the hippocampal GABAergic system. Furthermore, the NK1R antagonist SLV-323 showed neurobiological efficacy similar to that of fluoxetine.
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Affiliation(s)
- Boldizsár Czeh
- Clinical Neurobiology Laboratory, German Primate Center, Göttingen, Germany.
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Kole MHP, Costoli T, Koolhaas JM, Fuchs E. Bidirectional shift in the cornu ammonis 3 pyramidal dendritic organization following brief stress. Neuroscience 2004; 125:337-47. [PMID: 15062977 DOI: 10.1016/j.neuroscience.2004.02.014] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/11/2004] [Indexed: 10/26/2022]
Abstract
The negative impact of chronic stress at the structure of apical dendrite branches of cornu ammonis 3 (CA3) pyramidal neurons is well established. However, there is no information available on the CA3 dendritic organization related to short-lasting stress, which suffices to produce long-term habituation or sensitization of anxiety behaviors and neuroendocrine responses. Here, we tested the effects evoked by brief stress on the arrangements of CA3 pyramidal neuron dendrites, and the activity-dependent properties of the commissural-associational (C/A) excitatory postsynaptic potentials (EPSPs). Adult male rats were socially defeated followed by 3 weeks without further treatment or as comparison exposed to a regimen of a social defeat every second day for the same time period. We assessed CA3 pyramidal neurons with somatic whole-cell recording and neurobiotin application in acute hippocampal slices. The results from morphometric analysis of post hoc reconstructions demonstrated that CA3 dendrites from repeatedly stressed rats were reduced in surface area and length selectively at the apical cone (70% of control, approximately 280 microm from the soma). Brief stress, however, produced a similar decrease in apical dendritic length (77% of control, approximately 400 microm from the soma), accompanied by an increased length (167% of control) and branch complexity at the basal cone. The structural changes of the dendrites significantly influenced signal propagation by shortening the onset latency of EPSPs and increasing input resistance (r=0.45, P<0.01), of which the first was significantly changed in repeatedly stressed animals. Both brief and repeated stress long-lastingly impaired long-term potentiation of C/A synapses to a similar degree (P<0.05). These data indicate that the geometric plasticity of CA3 dendrites is dissociated from repetition of aversive experiences. A double social conflict suffices to drive a dynamic reorganization, by site-selective elimination and de novo growth of dendrite branches over the course of weeks after the actual experience.
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Affiliation(s)
- M H P Kole
- Clinical Neurobiology Laboratory, German Primate Center, Goettingen, Germany.
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