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Hagihara H, Shoji H, Otabi H, Toyoda A, Katoh K, Namihira M, Miyakawa T. Protein lactylation induced by neural excitation. Cell Rep 2021; 37:109820. [PMID: 34644564 DOI: 10.1016/j.celrep.2021.109820] [Citation(s) in RCA: 99] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 07/20/2021] [Accepted: 09/20/2021] [Indexed: 01/04/2023] Open
Abstract
Lactate has diverse roles in the brain at the molecular and behavioral levels under physiological and pathophysiological conditions. This study investigates whether lysine lactylation (Kla), a lactate-derived post-translational modification in macrophages, occurs in brain cells and if it does, whether Kla is induced by the stimuli that accompany changes in lactate levels. Here, we show that Kla in brain cells is regulated by neural excitation and social stress, with parallel changes in lactate levels. These stimuli increase Kla, which is associated with the expression of the neuronal activity marker c-Fos, as well as with decreased social behavior and increased anxiety-like behavior in the stress model. In addition, we identify 63 candidate lysine-lactylated proteins and find that stress preferentially increases histone H1 Kla. This study may open an avenue for the exploration of a role of neuronal activity-induced lactate mediated by protein lactylation in the brain.
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Affiliation(s)
- Hideo Hagihara
- Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Hirotaka Shoji
- Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan
| | - Hikari Otabi
- College of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan; United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8538, Japan
| | - Atsushi Toyoda
- College of Agriculture, Ibaraki University, Ami, Ibaraki 300-0393, Japan; United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo 183-8538, Japan; Ibaraki University Cooperation between Agriculture and Medical Science (IUCAM), Ami, Ibaraki 300-0393, Japan
| | - Kaoru Katoh
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8566, Japan; Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8566, Japan
| | - Masakazu Namihira
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8566, Japan
| | - Tsuyoshi Miyakawa
- Division of Systems Medical Science, Institute for Comprehensive Medical Science, Fujita Health University, Toyoake, Aichi 470-1192, Japan.
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2
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Audet MC. Beyond the neuro-immune interplay in depression: Could gut microbes be the missing link? Brain Behav Immun Health 2021; 16:100308. [PMID: 34589800 PMCID: PMC8474680 DOI: 10.1016/j.bbih.2021.100308] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 07/15/2021] [Accepted: 07/24/2021] [Indexed: 12/21/2022] Open
Abstract
Accumulating evidence have positioned inflammatory signaling pathways as crucial routes by which microbes inhabiting the gastrointestinal tract (the gut microbiota) communicate with the host brain to influence behavior, with impacts on mental illnesses. In this short review, an overview of inflammatory and gut microbiota status in human depression and in rodent models of the illness are provided. Next, potential inflammatory pathways mediating the communications between the gut and the brain under stressful conditions are described. Finally, dietary interventions targeting the gut microbiota-immune-brain axis in the context of depression are briefly discussed.
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Affiliation(s)
- Marie-Claude Audet
- School of Nutrition Sciences, University of Ottawa, Ottawa, Ontario, Canada.,Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada.,The Royal's Institute of Mental Health Research, Ottawa, Ontario, Canada
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3
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Gondré-Lewis MC, Bassey R, Blum K. Pre-clinical models of reward deficiency syndrome: A behavioral octopus. Neurosci Biobehav Rev 2020; 115:164-188. [PMID: 32360413 DOI: 10.1016/j.neubiorev.2020.04.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 04/08/2020] [Accepted: 04/20/2020] [Indexed: 12/15/2022]
Abstract
Individuals with mood disorders or with addiction, impulsivity and some personality disorders can share in common a dysfunction in how the brain perceives reward, where processing of natural endorphins or the response to exogenous dopamine stimulants is impaired. Reward Deficiency Syndrome (RDS) is a polygenic trait with implications that suggest cross-talk between different neurological systems that include the known reward pathway, neuroendocrine systems, and motivational systems. In this review we evaluate well-characterized animal models for their construct validity and as potential models for RDS. Animal models used to study substance use disorder, major depressive disorder (MDD), early life stress, immune dysregulation, attention deficit hyperactivity disorder (ADHD), post traumatic stress disorder (PTSD), compulsive gambling and compulsive eating disorders are discussed. These disorders recruit underlying reward deficiency mechanisms in multiple brain centers. Because of the widespread and remarkable array of associated/overlapping behavioral manifestations with a common root of hypodopaminergia, the basic endophenotype recognized as RDS is indeed likened to a behavioral octopus. We conclude this review with a look ahead on how these models can be used to investigate potential therapeutics that target the underlying common deficiency.
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Affiliation(s)
- Marjorie C Gondré-Lewis
- Department of Anatomy, Howard University College of Medicine, 520 W Street, NW, Washington D.C., 20059, United States; Developmental Neuropsychopharmacology Laboratory, Howard University College of Medicine, 520 W Street, NW, Washington D.C., 20059, United States.
| | - Rosemary Bassey
- Developmental Neuropsychopharmacology Laboratory, Howard University College of Medicine, 520 W Street, NW, Washington D.C., 20059, United States; Department of Science Education, Donald and Barbara Zucker School of Medicine at Hofstra/ Northwell, 500 Hofstra University, Hempstead, NY 11549, United States
| | - Kenneth Blum
- Western University Health Sciences, Graduate College of Biomedical Sciences, Pomona, California, United States
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4
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Stress-induced plasticity and functioning of ventral tegmental dopamine neurons. Neurosci Biobehav Rev 2020; 108:48-77. [DOI: 10.1016/j.neubiorev.2019.10.015] [Citation(s) in RCA: 97] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/26/2019] [Accepted: 10/22/2019] [Indexed: 12/14/2022]
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5
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Manchia M, Comai S, Pinna M, Pinna F, Fanos V, Denovan-Wright E, Carpiniello B. Biomarkers in aggression. Adv Clin Chem 2019; 93:169-237. [PMID: 31655730 DOI: 10.1016/bs.acc.2019.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Aggressive behavior exerts an enormous impact on society remaining among the main causes of worldwide premature death. Effective primary interventions, relying on predictive models of aggression that show adequate sensitivity and specificity are currently lacking. One strategy to increase the accuracy and precision of prediction would be to include biological data in the predictive models. Clearly, to be included in such models, biological markers should be reliably associated with the specific trait under study (i.e., diagnostic biomarkers). Aggression, however, is phenotypically highly heterogeneous, an element that has hindered the identification of reliable biomarkers. However, current research is trying to overcome these challenges by focusing on more homogenous aggression subtypes and/or by studying large sample size of aggressive individuals. Further advance is coming by bioinformatics approaches that are allowing the integration of inter-species biological data as well as the development of predictive algorithms able to discriminate subjects on the basis of the propensity toward aggressive behavior. In this review we first present a brief summary of the available evidence on neuroimaging of aggression. We will then treat extensively the data on genetic determinants, including those from hypothesis-free genome-wide association studies (GWAS) and candidate gene studies. Transcriptomic and neurochemical biomarkers will then be reviewed, and we will dedicate a section on the role of metabolomics in aggression. Finally, we will discuss how biomarkers can inform the development of new pharmacological tools as well as increase the efficacy of preventive strategies.
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Affiliation(s)
- Mirko Manchia
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy; Department of Pharmacology, Dalhousie University, Halifax, NS, Canada.
| | - Stefano Comai
- San Raffaele Scientific Institute and Vita Salute University, Milano, Italy; Department of Psychiatry, McGill University, Montreal, QC, Canada.
| | - Martina Pinna
- Forensic Psychiatry Unit, Sardinia Health Agency, Cagliari, Italy
| | - Federica Pinna
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Vassilios Fanos
- Department of Surgical Sciences, University of Cagliari, Cagliari, Italy; Puericulture Institute and Neonatal Section, University Hospital Agency of Cagliari, Cagliari, Italy
| | | | - Bernardo Carpiniello
- Section of Psychiatry, Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
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Headley DB, Kanta V, Kyriazi P, Paré D. Embracing Complexity in Defensive Networks. Neuron 2019; 103:189-201. [PMID: 31319049 PMCID: PMC6641575 DOI: 10.1016/j.neuron.2019.05.024] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2019] [Revised: 05/13/2019] [Accepted: 05/14/2019] [Indexed: 12/21/2022]
Abstract
The neural basis of defensive behaviors continues to attract much interest, not only because they are important for survival but also because their dysregulation may be at the origin of anxiety disorders. Recently, a dominant approach in the field has been the optogenetic manipulation of specific circuits or cell types within these circuits to dissect their role in different defensive behaviors. While the usefulness of optogenetics is unquestionable, we argue that this method, as currently applied, fosters an atomistic conceptualization of defensive behaviors, which hinders progress in understanding the integrated responses of nervous systems to threats. Instead, we advocate for a holistic approach to the problem, including observational study of natural behaviors and their neuronal correlates at multiple sites, coupled to the use of optogenetics, not to globally turn on or off neurons of interest, but to manipulate specific activity patterns hypothesized to regulate defensive behaviors.
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Affiliation(s)
- Drew B Headley
- Center for Molecular & Behavioral Neuroscience, Rutgers University - Newark, 197 University Avenue, Newark, NJ 07102, USA
| | - Vasiliki Kanta
- Center for Molecular & Behavioral Neuroscience, Rutgers University - Newark, 197 University Avenue, Newark, NJ 07102, USA; Behavioral and Neural Sciences Graduate Program, Rutgers University - Newark, 197 University Avenue, Newark, NJ 07102, USA
| | - Pinelopi Kyriazi
- Center for Molecular & Behavioral Neuroscience, Rutgers University - Newark, 197 University Avenue, Newark, NJ 07102, USA; Behavioral and Neural Sciences Graduate Program, Rutgers University - Newark, 197 University Avenue, Newark, NJ 07102, USA
| | - Denis Paré
- Center for Molecular & Behavioral Neuroscience, Rutgers University - Newark, 197 University Avenue, Newark, NJ 07102, USA.
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7
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Molendijk ML, de Kloet ER. Coping with the forced swim stressor: Current state-of-the-art. Behav Brain Res 2019; 364:1-10. [DOI: 10.1016/j.bbr.2019.02.005] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Accepted: 02/04/2019] [Indexed: 12/12/2022]
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8
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Parkinson's Disease-Linked LRRK2-G2019S Mutation Alters Synaptic Plasticity and Promotes Resilience to Chronic Social Stress in Young Adulthood. J Neurosci 2018; 38:9700-9711. [PMID: 30249796 DOI: 10.1523/jneurosci.1457-18.2018] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/06/2018] [Accepted: 09/13/2018] [Indexed: 12/20/2022] Open
Abstract
The G2019S mutation in leucine-rich repeat kinase 2 (LRRK2) is a prevalent cause of late-onset Parkinson's disease, producing psychiatric and motor symptoms, including depression, that are indistinguishable from sporadic cases. Here we tested how this mutation impacts depression-related behaviors and associated synaptic responses and plasticity in mice expressing a Lrrk2-G2019S knock-in mutation. Young adult male G2019S knock-in and wild-type mice were subjected to chronic social defeat stress (CSDS), a validated depression model, and other tests of anhedonia, anxiety, and motor learning. We found that G2019S mice were highly resilient to CSDS, failing to exhibit social avoidance compared to wild-type mice, many of which exhibited prominent social avoidance and were thus susceptible to CSDS. In the absence of CSDS, no behavioral differences between genotypes were found. Whole-cell recordings of spiny projection neurons (SPNs) in the nucleus accumbens revealed that glutamatergic synapses in G2019S mice lacked functional calcium-permeable AMPARs, and following CSDS, failed to accumulate inwardly rectifying AMPAR responses characteristic of susceptible mice. Based on this abnormal AMPAR response profile, we asked whether long-term potentiation (LTP) of corticostriatal synaptic strength was affected. We found that both D1 receptor (D1R)- and D2R-SPNs in G2019S mutants were unable to express LTP, with D2R-SPNs abnormally expressing long-term depression following an LTP-induction protocol. Thus, G2019S promotes resilience to chronic social stress in young adulthood, likely reflecting synapses constrained in their ability to undergo experience-dependent plasticity. These unexpected findings may indicate early adaptive coping mechanisms imparted by the G2019S mutation.SIGNIFICANCE STATEMENT The G2019S mutation in LRRK2 causes late-onset Parkinson's disease (PD). LRRK2 is highly expressed in striatal neurons throughout life, but it is unclear how mutant LRRK2 affects striatal neuron function and behaviors in young adulthood. We addressed this question using Lrrk2-G2019S knock-in mice. The data show that young adult G2019S mice were unusually resilient to a depression-like syndrome resulting from chronic social stress. Further, mutant striatal synapses were incapable of forms of synaptic plasticity normally accompanying depression-like behavior and important for supporting the full range of cognitive function. These data suggest that in humans, LRRK2 mutation may affect striatal circuit function in ways that alter normal responses to stress and could be relevant for treatment strategies for non-motor PD symptoms.
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9
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Transcriptome Alterations in Posttraumatic Stress Disorder. Biol Psychiatry 2018; 83:840-848. [PMID: 29128043 DOI: 10.1016/j.biopsych.2017.09.023] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 09/05/2017] [Accepted: 09/17/2017] [Indexed: 01/25/2023]
Abstract
Posttraumatic stress disorder (PTSD) is a debilitating psychiatric disorder with a lifetime prevalence of nearly 8% in the general population. While the underlying molecular and cellular mechanisms of PTSD remain unknown, recent studies indicate that PTSD is associated with aberrant gene expression in brain as well as peripheral blood cells. The advent of next-generation sequencing technologies will allow us to elucidate the gene expression changes occurring in both brain and blood of patients with PTSD. RNA sequencing allows for analysis of the amount of transcript being made as well as alternative splicing, novel transcript identification, microRNA, and noncoding RNA quantification. Here we provide an overview of the different types of transcriptomic technologies as well as the gene expression studies performed in human peripheral blood and animal models of PTSD, and review the human PTSD postmortem brain gene profiling studies performed to date.
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10
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Gallo FT, Katche C, Morici JF, Medina JH, Weisstaub NV. Immediate Early Genes, Memory and Psychiatric Disorders: Focus on c-Fos, Egr1 and Arc. Front Behav Neurosci 2018; 12:79. [PMID: 29755331 PMCID: PMC5932360 DOI: 10.3389/fnbeh.2018.00079] [Citation(s) in RCA: 210] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 04/10/2018] [Indexed: 01/08/2023] Open
Abstract
Many psychiatric disorders, despite their specific characteristics, share deficits in the cognitive domain including executive functions, emotional control and memory. However, memory deficits have been in many cases undervalued compared with other characteristics. The expression of Immediate Early Genes (IEGs) such as, c-fos, Egr1 and arc are selectively and promptly upregulated in learning and memory among neuronal subpopulations in regions associated with these processes. Changes in expression in these genes have been observed in recognition, working and fear related memories across the brain. Despite the enormous amount of data supporting changes in their expression during learning and memory and the importance of those cognitive processes in psychiatric conditions, there are very few studies analyzing the direct implication of the IEGs in mental illnesses. In this review, we discuss the role of some of the most relevant IEGs in relation with memory processes affected in psychiatric conditions.
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Affiliation(s)
- Francisco T Gallo
- Instituto de Fisiología y Biofísica Bernardo Houssay, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Cynthia Katche
- Instituto de Biología Celular y Neurociencias (IBCN) Dr. Eduardo de Robertis, Facultad de Medicina, CONICET, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Juan F Morici
- Instituto de Fisiología y Biofísica Bernardo Houssay, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
| | - Jorge H Medina
- Instituto de Biología Celular y Neurociencias (IBCN) Dr. Eduardo de Robertis, Facultad de Medicina, CONICET, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina.,Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos (UBA), Buenos Aires, Argentina
| | - Noelia V Weisstaub
- Instituto de Fisiología y Biofísica Bernardo Houssay, Departamento de Fisiología, Facultad de Medicina, Universidad de Buenos Aires (UBA), Buenos Aires, Argentina
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11
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JNK1 controls adult hippocampal neurogenesis and imposes cell-autonomous control of anxiety behaviour from the neurogenic niche. Mol Psychiatry 2018; 23:362-374. [PMID: 27843149 PMCID: PMC5794884 DOI: 10.1038/mp.2016.203] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 10/03/2016] [Accepted: 10/04/2016] [Indexed: 12/19/2022]
Abstract
Promoting adult hippocampal neurogenesis is expected to induce neuroplastic changes that improve mood and alleviate anxiety. However, the underlying mechanisms remain largely unknown and the hypothesis itself is controversial. Here we show that mice lacking Jnk1, or c-Jun N-terminal kinase (JNK) inhibitor-treated mice, display increased neurogenesis in adult hippocampus characterized by enhanced cell proliferation and survival, and increased maturation in the ventral region. Correspondingly, anxiety behaviour is reduced in a battery of tests, except when neurogenesis is prevented by AraC treatment. Using engineered retroviruses, we show that exclusive inhibition of JNK in adult-born granule cells alleviates anxiety and reduces depressive-like behaviour. These data validate the neurogenesis hypothesis of anxiety. Moreover, they establish a causal role for JNK in the hippocampal neurogenic niche and anxiety behaviour, and advocate targeting of JNK as an avenue for novel therapies against affective disorders.
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12
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Culmsee C, Michels S, Scheu S, Arolt V, Dannlowski U, Alferink J. Mitochondria, Microglia, and the Immune System-How Are They Linked in Affective Disorders? Front Psychiatry 2018; 9:739. [PMID: 30687139 PMCID: PMC6333629 DOI: 10.3389/fpsyt.2018.00739] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/14/2018] [Indexed: 12/19/2022] Open
Abstract
Major depressive disorder (MDD) is a severe mood disorder and frequently associated with alterations of the immune system characterized by enhanced levels of circulating pro-inflammatory cytokines and microglia activation in the brain. Increasing evidence suggests that dysfunction of mitochondria may play a key role in the pathogenesis of MDD. Mitochondria are regulators of numerous cellular functions including energy metabolism, maintenance of redox and calcium homeostasis, and cell death and therefore modulate many facets of the innate immune response. In depression-like behavior of rodents, mitochondrial perturbation and release of mitochondrial components have been shown to boost cytokine production and neuroinflammation. On the other hand, pro-inflammatory cytokines may influence mitochondrial functions such as oxidative phosphorylation, production of adenosine triphosphate, and reactive oxygen species, thereby aggravating inflammation. There is strong interest in a better understanding of immunometabolic pathways in MDD that may serve as diagnostic markers and therapeutic targets. Here, we review the interaction between mitochondrial metabolism and innate immunity in the pathophysiology of MDD. We specifically focus on immunometabolic processes that govern microglial and peripheral myeloid cell functions, both cellular components involved in neuroinflammation in depression-like behavior. We finally discuss microglial polarization and associated metabolic states in depression-associated behavior and in MDD.
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Affiliation(s)
- Carsten Culmsee
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior - CMBB, Marburg, Germany
| | - Susanne Michels
- Institute of Pharmacology and Clinical Pharmacy, University of Marburg, Marburg, Germany.,Center for Mind, Brain and Behavior - CMBB, Marburg, Germany
| | - Stefanie Scheu
- Institute of Medical Microbiology and Hospital Hygiene, University of Düsseldorf, Düsseldorf, Germany
| | - Volker Arolt
- Department of Psychiatry and Psychotherapy, University of Münster, Münster, Germany
| | - Udo Dannlowski
- Department of Psychiatry and Psychotherapy, University of Münster, Münster, Germany
| | - Judith Alferink
- Department of Psychiatry and Psychotherapy, University of Münster, Münster, Germany.,Cells in Motion, Cluster of Excellence, University of Münster, Münster, Germany
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Abstract
Exploration of neuroimmune mechanisms is vital to the understanding of the pathogenesis and pathophysiology of mental disorders. Inflammatory and immune mechanisms are increasingly understood to underpin a number of neuropsychiatric disorders, with an ever-expanding evidence base drawn from basic science to large-scale epidemiological data. Unravelling of these mechanisms should lead to biomarker discovery and potential new avenues for therapeutics that modulate immunological mechanisms. Identification of neuroimmune biomarkers is vital to improving diagnosis, stratification and treatment of mental disorders. There is an urgent clinical need for new therapeutic approaches with poor treatment response and treatment resistance a major problem for many psychiatric disorders including depression and schizophrenia. Neurodegenerative psychiatric disorders such as Alzheimer's also have clear neuroimmune underpinnings and manifest an urgent clinical need for improvements in diagnosis and research towards transformative disease-modifying treatments. This chapter provides some background on the role of the neuroimmune system in mental illness, exploring the role for biomarkers, in addition to reviewing the current state of knowledge in this exciting field. We also reflect on the inherent challenges and methodological pitfalls faced by research in this field, including the complexity of conceptualising multidimensional mental disorders and the dynamic shifting sands of the immune system.
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14
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Vogt MA, Pfeiffer N, Le Guisquet AM, Brandwein C, Brizard B, Gass P, Belzung C, Chourbaji S. May the use of different background strains 'strain' the stress-related phenotype of GR +/- mice? Behav Brain Res 2017; 335:71-79. [PMID: 28782590 DOI: 10.1016/j.bbr.2017.07.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 07/21/2017] [Accepted: 07/25/2017] [Indexed: 01/06/2023]
Abstract
Genetically altered mice are available on different background strains. While respective backcrosses are often performed for pragmatic reasons, e.g. references, comparability, or existing protocols, the interaction between the mutations per se and the background strain often remains a neglected factor. The heterozygous mutation of the glucocorticoid receptor gene (GR) represents a well-examined model for depressive-like behavior in mice. To address the question in how far a robust depressive-like phenotype on a distinct background strain may allow a generalized conclusion, we analyzed respective phenotypes in two commonly used inbred strains: i.) C57BL/6N and ii.) BALB/c. Beside the use of different genetic models, we also extended our approach by applying two alternative paradigms to induce a depressive-like phenotype. Our study therefore comprised the model of 'unpredictable chronic mild stress' (UCMS) for four weeks and 'learned helplessness' (LH), which were used to study the role of GR, a key player in the development of depression. In the course of the experiment two cohorts of male GR+/- mice on either C57BL/6N or BALB/c background strain underwent a behavioral test battery to assess basal and depressive-like features. While both stress paradigms were functional in inducing depressive-like changes, the results were strictly strain-dependent. The genetic consequences became even more obvious under non-stress conditions with significant effects detected in BALB/c mice, which indicates a different basal stress predisposition due to differences in the genetic background.
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Affiliation(s)
- Miriam A Vogt
- Interfaculty Biomedical Research Facility, University of Heidelberg, Heidelberg, Germany; Central Institute of Mental Health, RG Animal Models in Psychiatry, Medical Faculty of Mannheim/University of Heidelberg, Mannheim, Germany.
| | - Natascha Pfeiffer
- Central Institute of Mental Health, RG Animal Models in Psychiatry, Medical Faculty of Mannheim/University of Heidelberg, Mannheim, Germany
| | - Anne Marie Le Guisquet
- Brain & Imaging (INSERM - UMR 930), Université François Rabelais de Tours, Tours, France
| | - Christiane Brandwein
- Central Institute of Mental Health, RG Animal Models in Psychiatry, Medical Faculty of Mannheim/University of Heidelberg, Mannheim, Germany
| | - Bruno Brizard
- Brain & Imaging (INSERM - UMR 930), Université François Rabelais de Tours, Tours, France
| | - Peter Gass
- Central Institute of Mental Health, RG Animal Models in Psychiatry, Medical Faculty of Mannheim/University of Heidelberg, Mannheim, Germany
| | - Catherine Belzung
- Brain & Imaging (INSERM - UMR 930), Université François Rabelais de Tours, Tours, France
| | - Sabine Chourbaji
- Interfaculty Biomedical Research Facility, University of Heidelberg, Heidelberg, Germany; Central Institute of Mental Health, RG Animal Models in Psychiatry, Medical Faculty of Mannheim/University of Heidelberg, Mannheim, Germany
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15
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Yang L, Shi LJ, Yu J, Zhang YQ. Activation of protein kinase A in the amygdala modulates anxiety-like behaviors in social defeat exposed mice. Mol Brain 2016; 9:3. [PMID: 26747511 PMCID: PMC4706664 DOI: 10.1186/s13041-015-0181-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 12/23/2015] [Indexed: 12/15/2022] Open
Abstract
Background Social defeat (SD) stress induces social avoidance and anxiety-like phenotypes. Amygdala is recognized as an emotion-related brain region such as fear, aversion and anxiety. It is conceivable to hypothesize that activation of amygdala is involved in SD-dependent behavioral defects. Results SD model was established using C57BL/6J mice that were physically defeated by different CD-1 mice for 10 days. Stressed mice exhibited decreased social interaction level in social interaction test and significant anxiety-like behaviors in elevated plus maze and open field tests. Meanwhile, a higher phosphorylation of PKA and CREB with a mutually linear correlation, and increased Fos labeled cells in the basolateral amygdala (BLA) were observed. Activation of PKA in the BLA by 8-Br-cAMP, a PKA activitor, significantly upregulated pCREB and Fos expression. To address the role of PKA activation on SD stress-induced social avoidance and anxiety-like behaviors, 8-Br-cAMP or H-89, a PKA inhibitor, was continuously administered into the bilateral BLA by a micro-osmotic pump system during the 10-day SD period. Neither H-89 nor 8-Br-cAMP affected the social behavior. Differently, 8-Br-cAMP significantly relieved anxiety-like behaviors in both general and moderate SD protocols. H-89 per se did not have anxiogenic effect in naïve mice, but aggravated moderate SD stress-induced anxiety-like behaviors. The antidepressant clomipramine reduced SD-induced anxiety and up-regulated pPKA level in the BLA. Conclusions These results suggest that SD-driven PKA activation in the basolateral amygdala is actually a compensatory rather than pathogenic response in the homeostasis, and modulating amygdaloid PKA may exhibit potency in the therapy of social derived disorders. Electronic supplementary material The online version of this article (doi:10.1186/s13041-015-0181-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Liu Yang
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Collaborative Innovation Center for Brain Science, Fudan University, 1202 Mingdao Building, 131 Dong An Road, Shanghai, 200032, China.
| | - Li-Jun Shi
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Collaborative Innovation Center for Brain Science, Fudan University, 1202 Mingdao Building, 131 Dong An Road, Shanghai, 200032, China.
| | - Jin Yu
- Department of Integrative Medicine and Neurobiology, Shanghai Medical School, Fudan University, Shanghai, 200032, China.
| | - Yu-Qiu Zhang
- Institute of Neurobiology, Institutes of Brain Science and State Key Laboratory of Medical Neurobiology, Collaborative Innovation Center for Brain Science, Fudan University, 1202 Mingdao Building, 131 Dong An Road, Shanghai, 200032, China.
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Peterlik D, Flor PJ, Uschold-Schmidt N. The Emerging Role of Metabotropic Glutamate Receptors in the Pathophysiology of Chronic Stress-Related Disorders. Curr Neuropharmacol 2016; 14:514-39. [PMID: 27296643 PMCID: PMC4983752 DOI: 10.2174/1570159x13666150515234920] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Revised: 04/04/2015] [Accepted: 05/12/2015] [Indexed: 12/28/2022] Open
Abstract
Chronic stress-related psychiatric conditions such as anxiety, depression, and alcohol abuse are an enormous public health concern. The etiology of these pathologies is complex, with psychosocial stressors being among the most frequently discussed risk factors. The brain glutamatergic neurotransmitter system has often been found involved in behaviors and pathophysiologies resulting from acute stress and fear. Despite this, relatively little is known about the role of glutamatergic system components in chronic psychosocial stress, neither in rodents nor in humans. Recently, drug discovery efforts at the metabotropic receptor subtypes of the glutamatergic system (mGlu1-8 receptors) led to the identification of pharmacological tools with emerging potential in psychiatric conditions. But again, the contribution of individual mGlu subtypes to the manifestation of physiological, molecular, and behavioral consequences of chronic psychosocial stress remains still largely unaddressed. The current review will describe animal models typically used to analyze acute and particularly chronic stress conditions, including models of psychosocial stress, and there we will discuss the emerging roles for mGlu receptor subtypes. Indeed, accumulating evidence indicates relevance and potential therapeutic usefulness of mGlu2/3 ligands and mGlu5 receptor antagonists in chronic stress-related disorders. In addition, a role for further mechanisms, e.g. mGlu7-selective compounds, is beginning to emerge. These mechanisms are important to be analyzed in chronic psychosocial stress paradigms, e.g. in the chronic subordinate colony housing (CSC) model. We summarize the early results and discuss necessary future investigations, especially for mGlu5 and mGlu7 receptor blockers, which might serve to suggest improved therapeutic strategies to treat stress-related disorders.
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Affiliation(s)
| | - Peter J Flor
- Faculty of Biology and Preclinical Medicine, University of Regensburg, D-93053 Regensburg, Germany.
| | - Nicole Uschold-Schmidt
- Faculty of Biology and Preclinical Medicine, University of Regensburg, D-93053 Regensburg, Germany.
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Balsevich G, Baumann V, Uribe A, Chen A, Schmidt MV. Prenatal Exposure to Maternal Obesity Alters Anxiety and Stress Coping Behaviors in Aged Mice. Neuroendocrinology 2016; 103:354-68. [PMID: 26279463 DOI: 10.1159/000439087] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 07/28/2015] [Indexed: 11/19/2022]
Abstract
BACKGROUND There is growing evidence that maternal obesity and prenatal exposure to a high-fat diet program fetal development to regulate the physiology and behavior of the offspring in adulthood. Yet the extent to which the maternal dietary environment contributes to adult disease vulnerability remains unclear. In the current study we tested whether prenatal exposure to maternal obesity increases the offspring's vulnerability to stress-related psychiatric disorders. METHODS We used a mouse model of maternal diet-induced obesity to investigate whether maternal obesity affects the response to adult chronic stress exposure in young adult (3-month-old) and aged adult (12-month-old) offspring. RESULTS Long-lasting, delayed impairments to anxiety-like behaviors and stress coping strategies resulted on account of prenatal exposure to maternal obesity. Although maternal obesity did not change the offspring's behavioral response to chronic stress per se, we demonstrate that the behavioral outcomes induced by prenatal exposure to maternal obesity parallel the deleterious effects of adult chronic stress exposure in aged male mice. We found that the glucocorticoid receptor (GR, Nr3c1) is upregulated in various hypothalamic nuclei on account of maternal obesity. In addition, gene expression of a known regulator of the GR, FKBP51, is increased specifically within the paraventricular nucleus. CONCLUSIONS These findings indicate that maternal obesity parallels the deleterious effects of adult chronic stress exposure, and furthermore identifies GR/FKBP51 signaling as a novel candidate pathway regulated by maternal obesity.
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Affiliation(s)
- Georgia Balsevich
- Department of Stress Neurobiology and Neurogenetics, Max Planck Institute of Psychiatry, Munich, Germany
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18
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Monleón S, Duque A, Vinader-Caerols C. Effects of several degrees of chronic social defeat stress on emotional and spatial memory in CD1 mice. Behav Processes 2015; 124:23-31. [PMID: 26679824 DOI: 10.1016/j.beproc.2015.12.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 12/02/2015] [Accepted: 12/05/2015] [Indexed: 10/22/2022]
Abstract
In the present study, the effects of several degrees of CSDS (Chronic Social Defeat Stress) on emotional and spatial memory in mice were evaluated in separate experiments. Male CD1 mice were randomly assigned to four experimental groups (n=10-12) for each experiment: NS (non-stressed), S5, S10 and S20 (5, 10 and 20 sessions of CSDS, respectively). The S groups underwent the corresponding number of agonistic encounters (10min each) over a 20-day period. 24h after the last session of CSDS, mice performed the inhibitory avoidance (Experiment 1) or the Morris water maze test (Experiment 2). In both experiments, animals were also evaluated in the elevated plus maze for 5min to obtain complementary measures of locomotor activity and emotionality. The results showed that the highest degree of CSDS had impairing effects on inhibitory avoidance, while there were no significant differences between groups in the water maze. The S20 group exhibited higher anxiety levels in the elevated plus maze. No variations in locomotor activity were observed in any experiment. In conclusion, CSDS has a greater impact on emotional memory than on spatial memory. These negative effects of CSDS on memory do not seem to be secondary to the motor or emotional effects of stress.
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Affiliation(s)
- Santiago Monleón
- Department of Psychobiology, University of Valencia, Valencia, Spain.
| | - Aranzazu Duque
- Department of Psychobiology, University of Valencia, Valencia, Spain.
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Hodes GE, Kana V, Menard C, Merad M, Russo SJ. Neuroimmune mechanisms of depression. Nat Neurosci 2015; 18:1386-93. [PMID: 26404713 DOI: 10.1038/nn.4113] [Citation(s) in RCA: 376] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Accepted: 08/18/2015] [Indexed: 12/13/2022]
Abstract
Current diagnosis of depression is based solely on behavioral symptomatology. The available US Food and Drug Administration-approved treatments for depression have come from serendipitous discovery and are ineffective in nearly 30-50% of patients, which is thought to reflect a lack of specificity in targeting underlying pathophysiological mechanisms. Recent evidence has identified depression-related disruptions in a neuroimmune axis that interfaces the immune system and CNS to control behavior. This Review examines the evidence in patients and in animal models of depression that demonstrates how the peripheral immune system acts on the brain to alter an individual's response to stress, ultimately contributing to their vulnerability to mood disorders.
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Affiliation(s)
- Georgia E Hodes
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Veronika Kana
- Department of Oncological Sciences, Tisch Cancer Institute and Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Caroline Menard
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Miriam Merad
- Department of Oncological Sciences, Tisch Cancer Institute and Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Scott J Russo
- Fishberg Department of Neuroscience and Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
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20
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Challis C, Berton O. Top-Down Control of Serotonin Systems by the Prefrontal Cortex: A Path toward Restored Socioemotional Function in Depression. ACS Chem Neurosci 2015; 6:1040-54. [PMID: 25706226 DOI: 10.1021/acschemneuro.5b00007] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Social withdrawal, increased threat perception, and exaggerated reassurance seeking behaviors are prominent interpersonal symptoms in major depressive disorder (MDD). Altered serotonin (5-HT) systems and corticolimbic dysconnectivity have long been suspected to contribute to these symptomatic facets; however, the underlying circuits and intrinsic cellular mechanisms that control 5-HT output during socioemotional interactions remain poorly understood. We review literature that implicates a direct pathway between the ventromedial prefrontal cortex (vmPFC) and dorsal raphe nucleus (DRN) in the adaptive and pathological control of social approach-avoidance behaviors. Imaging and neuromodulation during approach-avoidance tasks in humans point to the cortical control of brainstem circuits as an essential regulator of socioemotional decisions and actions. Parallel rodent studies using viral-based connectomics and optogenetics are beginning to provide a cellular blueprint of the underlying circuitry. In these studies, manipulations of vmPFC synaptic inputs to the DRN have revealed bidirectional influences on socioaffective behaviors via direct monosynaptic excitation and indirect disynaptic inhibition of 5-HT neurons. Additionally, adverse social experiences that result in permanent avoidance biases, such as social defeat, drive long-lasting plasticity in this microcircuit, potentiating the indirect inhibition of 5-HT output. Conversely, neuromodulation of the vmPFC via deep brain stimulation (DBS) attenuates avoidance biases by restoring the direct excitatory drive of 5-HT neurons and strengthening a key subset of forebrain 5-HT projections. Better understanding the cellular organization of the vmPFC-DRN pathway and identifying molecular determinants of its neuroplasticity can open fundamentally novel avenues for the treatment of affective disorders.
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Affiliation(s)
- Collin Challis
- Department of Psychiatry, ‡Neuroscience Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104, United States
| | - Olivier Berton
- Department of Psychiatry, ‡Neuroscience Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104, United States
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21
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Somkuwar SS, Staples MC, Galinato MH, Fannon MJ, Mandyam CD. Role of NG2 expressing cells in addiction: a new approach for an old problem. Front Pharmacol 2014; 5:279. [PMID: 25566075 PMCID: PMC4271769 DOI: 10.3389/fphar.2014.00279] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 11/30/2014] [Indexed: 12/17/2022] Open
Abstract
Neuron-glial antigen 2 (NG2) is a proteoglycan expressed predominantly in oligodendrocyte progenitor cells (OPCs). NG2-expressing OPCs (NG2-OPCs) are self-renewing cells that are widely distributed in the gray and white matter areas of the central nervous system. NG2-OPCs can mature into premyelinating oligodendrocytes and myelinating oligodendroglia which serve as the primary source of myelin in the brain. This review characterizes NG2-OPCs in brain structure and function, conceptualizes the role of NG2-OPCs in brain regions associated with negative reinforcement and relapse to drug seeking and discusses how NG2-OPCs are regulated by neuromodulators linked to motivational withdrawal. We hope to provide the readers with an overview of the role of NG2-OPCs in brain structure and function in the context of negative affect state in substance abuse disorders and to integrate our current understanding of the physiological significance of the NG2-OPCs in the adult brain.
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Affiliation(s)
- Sucharita S Somkuwar
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute La Jolla, CA, USA
| | - Miranda C Staples
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute La Jolla, CA, USA
| | - Melissa H Galinato
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute La Jolla, CA, USA
| | - McKenzie J Fannon
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute La Jolla, CA, USA
| | - Chitra D Mandyam
- Committee on the Neurobiology of Addictive Disorders, The Scripps Research Institute La Jolla, CA, USA
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22
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Behavioural and transcriptional effects of escitalopram in the chronic escape deficit model of depression. Behav Brain Res 2014; 272:121-30. [DOI: 10.1016/j.bbr.2014.06.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Revised: 06/17/2014] [Accepted: 06/23/2014] [Indexed: 02/02/2023]
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Carlberg L, Scheibelreiter J, Hassler MR, Schloegelhofer M, Schmoeger M, Ludwig B, Kasper S, Aschauer H, Egger G, Schosser A. Brain-derived neurotrophic factor (BDNF)-epigenetic regulation in unipolar and bipolar affective disorder. J Affect Disord 2014; 168:399-406. [PMID: 25106037 DOI: 10.1016/j.jad.2014.07.022] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 06/16/2014] [Accepted: 07/12/2014] [Indexed: 01/16/2023]
Abstract
BACKGROUND Alterations of brain-derived neurotrophic factor (BDNF) DNA methylation at specific BDNF promoters and corresponding gene expressions are associated with pathology and the response to antidepressant (AD) therapy in affective disorders such as major depressive disorder (MDD) and bipolar disorder (BD). METHODS Genomic DNA was derived from peripheral blood mononuclear cells (PBMCs) and was bisulfite converted. Percentage of methylated reference (PMR) was calculated based on results from quantitative real-time PCR following the MethyLight protocol. For statistical analysis parametric procedures were performed as appropriate. RESULTS In this study 544 subjects were included, 207 MDD subjects, 59 BD subjects and 278 control subjects. The BDNF exon I promoter methylation resulted to be significantly increased in MDD subjects compared to BD subjects (p=0.0089) and control subjects (p<0.001). Furthermore, the increase of methylation in MDD subjects was significantly associated with AD therapy (p=0.0019) but not to the clinical features of depression such as the severity of symptoms (p=n.s.). None of the 12 investigated single nucleotide polymorphisms (SNP) showed significant genotype-methylation interactions. LIMITATIONS Although based on previous findings, the DNA methylation was evaluated within only one CpG island of the different alternative BDNF gene transcripts. CONCLUSIONS The results suggest that the methylation status might not only be affected by the disease phenotype but might also be further influenced by pharmacological treatment, therefore harbouring the possibility of identifying new insights for treatment options.
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Affiliation(s)
- Laura Carlberg
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | | | - Melanie R Hassler
- Clinical Institute of Pathology, Medical University of Vienna, Austria
| | - Monika Schloegelhofer
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Michaela Schmoeger
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Birgit Ludwig
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Siegfried Kasper
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Harald Aschauer
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Gerda Egger
- Clinical Institute of Pathology, Medical University of Vienna, Austria
| | - Alexandra Schosser
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria; Zentrum für Seelische Gesundheit LEOpoldau, Vienna, Austria.
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24
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Post RM, Altshuler L, Leverich G, Nolen W, Kupka R, Grunze H, Frye M, Suppes T, McElroy S, Keck P, Rowe M. More stressors prior to and during the course of bipolar illness in patients from the United States compared with the Netherlands and Germany. Psychiatry Res 2013; 210:880-6. [PMID: 24021999 DOI: 10.1016/j.psychres.2013.08.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 08/02/2013] [Accepted: 08/08/2013] [Indexed: 02/08/2023]
Abstract
Considerable data suggest that compared to some European countries, in the U.S. there are more childhood onset bipolar disorders, more adverse courses of illness, and greater treatment resistance. Psychosocial variables related to these findings have not been adequately explored. Therefore we analyzed psychosocial stressors in three time domains: childhood; the year prior to illness Onset; and the Last Episode from questionnaires in 968 outpatients (mean age 41) with bipolar I or II disorder; 676 from four sites in the U.S. and 292 from three in the Netherlands and Germany (abbreviated here as Europe). Compared to the Europeans, those from the U.S. had significantly more stressors in childhood and prior to the last episode. Stressors prior to the last episode were related to: childhood stressors; an earlier age at illness onset; anxiety and substance abuse comorbidity; lower income; both parents having an affective illness; and feeling more stigma. These data suggest a greater prevalence of adverse life events in childhood and over the course of bipolar illness in the U.S. compared to the Netherlands and Germany. Clinical, therapeutic, and public health approaches to these illness-relevant stressors require further exploration.
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Affiliation(s)
- Robert M Post
- Bipolar Collaborative Network, Bethesda MD; Clinical Professor Psychiatry and Behavioral Sciences, George Washington University, Washington, D.C.; Bipolar Collaborative Network, Bethesda, MD, USA.
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25
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Abstract
Serotonin (5-HT) modulates neural responses to socioaffective cues and can bias approach or avoidance behavioral decisions, yet the cellular mechanisms underlying its contribution to the regulation of social experiences remain poorly understood. We hypothesized that GABAergic neurons in the dorsal raphe nucleus (DRN) may participate in socioaffective regulation by controlling serotonergic tone during social interaction. We tested this hypothesis using whole-cell recording techniques in genetically identified DRN GABA and 5-HT neurons in mice exposed to social defeat, a model that induces long-lasting avoidance behaviors in a subset of mice responsive to serotonergic antidepressants. Our results revealed that social defeat engaged DRN GABA neurons and drove GABAergic sensitization that strengthened inhibition of 5-HT neurons in mice that were susceptible, but not resilient to social defeat. Furthermore, optogenetic silencing of DRN GABA neurons disinhibited neighboring 5-HT neurons and prevented the acquisition of social avoidance in mice exposed to a social threat, but did not affect a previously acquired avoidance phenotype. We provide the first characterization of GABA neurons in the DRN that monosynaptically inhibit 5-HT neurons and reveal their key role in neuroplastic processes underlying the development of social avoidance.
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26
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Rutten BPF, Hammels C, Geschwind N, Menne-Lothmann C, Pishva E, Schruers K, van den Hove D, Kenis G, van Os J, Wichers M. Resilience in mental health: linking psychological and neurobiological perspectives. Acta Psychiatr Scand 2013; 128:3-20. [PMID: 23488807 PMCID: PMC3746114 DOI: 10.1111/acps.12095] [Citation(s) in RCA: 220] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/17/2013] [Indexed: 01/05/2023]
Abstract
OBJECTIVE To review the literature on psychological and biological findings on resilience (i.e. the successful adaptation and swift recovery after experiencing life adversities) at the level of the individual, and to integrate findings from animal and human studies. METHOD Electronic and manual literature search of MEDLINE, EMBASE and PSYCHINFO, using a range of search terms around biological and psychological factors influencing resilience as observed in human and experimental animal studies, complemented by review articles and cross-references. RESULTS The term resilience is used in the literature for different phenomena ranging from prevention of mental health disturbance to successful adaptation and swift recovery after experiencing life adversities, and may also include post-traumatic psychological growth. Secure attachment, experiencing positive emotions and having a purpose in life are three important psychological building blocks of resilience. Overlap between psychological and biological findings on resilience in the literature is most apparent for the topic of stress sensitivity, although recent results suggest a crucial role for reward experience in resilience. CONCLUSION Improving the understanding of the links between genetic endowment, environmental impact and gene-environment interactions with developmental psychology and biology is crucial for elucidating the neurobiological and psychological underpinnings of resilience.
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Affiliation(s)
- B P F Rutten
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical Centre, Maastricht, the Netherlands.
| | - C Hammels
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands
| | - N Geschwind
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands,Research Group on Health Psychology, CLEP, Department of Psychology, University of LeuvenLeuven, Belgium
| | - C Menne-Lothmann
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands
| | - E Pishva
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands
| | - K Schruers
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands,Center for Learning and Experimental Psychology, Catholic University of LeuvenLeuven, Belgium
| | - D van den Hove
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands,Department of Psychiatry, Psychosomatics and Psychotherapy, University of WürzburgWürzburg, Germany
| | - G Kenis
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands
| | - J van Os
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands,King's Health Partners, Department of Psychosis Studies, Institute of Psychiatry, King's College LondonLondon, UK
| | - M Wichers
- Department of Psychiatry and Psychology, Faculty of Health, Medicine and Life Sciences, School for Mental Health and Neuroscience (MHeNS), European Graduate School of Neuroscience (EURON), Maastricht University Medical CentreMaastricht, the Netherlands
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27
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Venzala E, García-García AL, Elizalde N, Tordera RM. Social vs. environmental stress models of depression from a behavioural and neurochemical approach. Eur Neuropsychopharmacol 2013; 23:697-708. [PMID: 22743048 DOI: 10.1016/j.euroneuro.2012.05.010] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/25/2012] [Accepted: 05/29/2012] [Indexed: 01/02/2023]
Abstract
Major depression is a mental disorder often preceded by exposure to chronic stress or stressful life events. Recently, animal models based on social conflict such as chronic social defeat stress (CSDS) are proposed to be more relevant to stress-induced human psychopathology compared to environmental models like the chronic mild stress (CMS). However, while CMS reproduces specifically core depressive symptoms such as anhedonia and helplessness, CSDS studies rely on the analysis of stress-induced social avoidance, addressing different neuropsychiatric disorders. Here, we study comparatively the two models from a behavioural and neurochemical approach and their possible relevance to human depression. Mice (C57BL/6) were exposed to CMS or CSDS for six weeks and ten days. Anhedonia was periodically evaluated. A battery of test applied during the fourth week after the stress procedure included motor activity, memory, anxiety, social interaction and helplessness. Subsequently, we examined glutamate, GABA, 5-HT and dopamine levels in the prefrontal cortex, hippocampus and brainstem. CMS induced a clear depressive-like profile including anhedonia, helplessness and memory impairment. CSDS induced anhedonia, hyperactivity, anxiety and social avoidance, signs also common to anxiety and posttraumatic stress disorders. While both models disrupted the excitatory inhibitory balance in the prefrontal cortex, CMS altered importantly this balance in the brainstem. Moreover, CSDS decreased dopamine in the prefrontal cortex and brainstem. We suggests that while depressive-like behaviours might be associated to altered aminoacid neurotransmission in cortical and brain stem areas, CSDS induced anxiety behaviours might be linked to specific alteration of dopaminergic pathways involved in rewarding processes.
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Affiliation(s)
- E Venzala
- Department of Pharmacology, University of Navarra, 31080 Pamplona, Spain
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28
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Goswami S, Rodríguez-Sierra O, Cascardi M, Paré D. Animal models of post-traumatic stress disorder: face validity. Front Neurosci 2013; 7:89. [PMID: 23754973 PMCID: PMC3668155 DOI: 10.3389/fnins.2013.00089] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 05/13/2013] [Indexed: 01/20/2023] Open
Abstract
Post-traumatic stress disorder (PTSD) is a debilitating condition that develops in a proportion of individuals following a traumatic event. Despite recent advances, ethical limitations associated with human research impede progress in understanding PTSD. Fortunately, much effort has focused on developing animal models to help study the pathophysiology of PTSD. Here, we provide an overview of animal PTSD models where a variety of stressors (physical, psychosocial, or psychogenic) are used to examine the long-term effects of severe trauma. We emphasize models involving predator threat because they reproduce human individual differences in susceptibility to, and in the long-term consequences of, psychological trauma.
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Affiliation(s)
- Sonal Goswami
- Center for Molecular and Behavioral Neuroscience, Rutgers State University Newark, NJ, USA
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Post RM, Kalivas P. Bipolar disorder and substance misuse: pathological and therapeutic implications of their comorbidity and cross-sensitisation. Br J Psychiatry 2013; 202:172-6. [PMID: 23457180 PMCID: PMC4340700 DOI: 10.1192/bjp.bp.112.116855] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
BACKGROUND Bipolar disorder has a high co-occurrence with substance use disorders, but the pathophysiological mechanisms have not been adequately explored. AIMS To review the role of stress in the onset and recurrence of affective episodes and substance misuse. METHOD We review the mechanisms involved in sensitisation (increased responsivity) to recurrence of stressors, mood episodes and cocaine use. RESULTS Evidence suggests that intermittent stressors, mood episodes and bouts of cocaine use not only show sensitisation to themselves, but cross-sensitisation to the others contributing to illness progression. Converseley, an understanding of the common mechanisms of sensitisation (such as regionally selective alterations in brain derived neurotrophic factor (BDNF) and hyperactivity of striatally based habit memories), could also result in single therapies (such as N-acetylcysteine) having positive effects in all three domains. CONCLUSIONS These interacting sensitisation processes suggest the importance of early intervention in attempting to prevent increasingly severe manifestations of bipolar illness and substance misuse progression.
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Affiliation(s)
- Robert M. Post
- Head, Bipolar Collaborative Network, 5415 W. Cedar Lane, Suite 201-B, Bethesda, MD 20814, Phone: 301-530-8245, FAX: 301-530-8247, Cell phone: 240-888-1317
| | - Peter Kalivas
- Chair (Research), Department of Neurosciences, Medical University of South Carolina, Neuroscience Research, 205 DD Drug Discovery Building, 70 President St., Charleston, South Carolina, 29425, 843-876-2340, 843-792-4423
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Kumar J, Chuang JC, Na ES, Kuperman A, Gillman AG, Mukherjee S, Zigman JM, McClung CA, Lutter M. Differential effects of chronic social stress and fluoxetine on meal patterns in mice. Appetite 2013; 64:81-8. [PMID: 23318656 DOI: 10.1016/j.appet.2012.12.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 11/09/2012] [Accepted: 12/14/2012] [Indexed: 01/03/2023]
Abstract
Both chronic stress and antidepressant medications have been associated with changes in body weight. In the current study, we investigate mechanisms by which stress and antidepressants interact to affect meal patterns. A group of mice was subjected to the chronic social defeat stress model of major depression followed by fluoxetine treatment and was subsequently analyzed for food intake using metabolic cages. We report that chronic social defeat stress increases food intake by specifically increasing meal size, an effect that is reversed by fluoxetine treatment. In an attempt to gain mechanistic insight into changes in meal patterning induced by stress and fluoxetine, fasting serum samples were collected every 4h over a 24-h period, and acyl-ghrelin, leptin, and corticosterone levels were measured. Chronic stress induces a peak in acyl-ghrelin levels just prior to the onset of the dark phase, which is shifted in mice treated with fluoxetine. Taken together, these results indicate that stress increases food intake by decreasing satiation, and that fluoxetine can reverse stress-induced changes in meal patterns.
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Affiliation(s)
- Jaswinder Kumar
- Department of Psychiatry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9070, USA.
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Rapid regulation of depression-related behaviours by control of midbrain dopamine neurons. Nature 2012; 493:532-6. [PMID: 23235832 PMCID: PMC3554860 DOI: 10.1038/nature11713] [Citation(s) in RCA: 786] [Impact Index Per Article: 65.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Accepted: 10/25/2012] [Indexed: 12/12/2022]
Abstract
Ventral tegmental area (VTA) dopamine (DA) neurons in the brain’s reward circuit play a crucial role in mediating stress responses1–4 including determining susceptibility vs. resilience to social stress-induced behavioural abnormalities5. VTA DA neurons exhibit two in vivo patterns of firing: low frequency tonic firing and high frequency phasic firing6–8. Phasic firing of the neurons, which is well known to encode reward signals6,7,9, is upregulated by repeated social defeat stress, a highly validated mouse model of depression5,8,10–13. Surprisingly, this pathophysiological effect is seen in susceptible mice only, with no change in firing rate apparent in resilient individuals5,8. However, direct evidence linking—in real-time—DA neuron phasic firing in promoting the susceptible (depression-like) phenotype is lacking. Here, we took advantage of the temporal precision and cell type- and projection pathway-specificity of optogenetics to demonstrate that enhanced phasic firing of these neurons mediates susceptibility to social defeat stress in freely behaving mice. We show that optogenetic induction of phasic, but not tonic, firing, in VTA DA neurons of mice undergoing a subthreshold social defeat paradigm rapidly induced a susceptible phenotype as measured by social avoidance and decreased sucrose preference. Optogenetic phasic stimulation of these neurons also quickly induced a susceptible phenotype in previously resilient mice that had been subjected to repeated social defeat stress. Furthermore, we show differences in projection pathway-specificity in promoting stress susceptibility: phasic activation of VTA neurons projecting to the nucleus accumbens (NAc), but not to the medial prefrontal cortex (mPFC), induced susceptibility to social defeat stress. Conversely, optogenetic inhibition of the VTA-NAc projection induced resilience, while inhibition of the VTA-mPFC projection promoted susceptibility. Overall, these studies reveal novel firing pattern- and neural circuit-specific mechanisms of depression.
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Hodes GE, Russo SJ. The Neurobiology of Depression and Anxiety: How Do We Change from Models of Drug Efficacy to Understanding Mood and Anxiety Disorders? DRUG DISCOVERY FOR PSYCHIATRIC DISORDERS 2012. [DOI: 10.1039/9781849734943-00159] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Current treatments for depression and anxiety disorders are only effective in approximately half of the patient population. Effective treatments have negative side-effects including sexual dysfunction, weight gain and gastrointestinal problems. Furthermore, even when patients achieve remission, they often need to increase dosage or change treatment across their lifetime as efficacy weakens. The majority of treatments being used today are based on the monoamine hypothesis of depression, a theory of depression that was based on the effectiveness of drugs discovered by chance to alleviate the symptoms of depression. This chapter provides an overview of the neurobiology of depression and anxiety disorders within the context of drug discovery. The chapter starts with what we currently know about these disorders through the lens of the monoamine hypothesis of depression. We then provide a background into the animal models of depression and anxiety that are being used to understand the underlying biology of these disorders and test new treatments. Work conducted using these animal models has directed human imagining and has provided us with new information about both the molecular and cellular mechanism of depression and anxiety as well as the neural circuitry controlling these disorders. Finally, we will conclude with a discussion of new treatments being developed based on empirical evidence about the neurobiology of depression and anxiety and the need to develop more personalized treatments in the future. It is hoped that these new drugs will be able to provide effective treatment for more people, with fewer negative side-effects.
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Affiliation(s)
- Georgia E. Hodes
- Fishberg Department of Neuroscience and Freidman Brain Institute Mount Sinai School of Medicine 1425 Madison Ave., New York, NY 10029 USA
| | - Scott J. Russo
- Fishberg Department of Neuroscience and Freidman Brain Institute Mount Sinai School of Medicine 1425 Madison Ave., New York, NY 10029 USA
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Venzala E, García-García AL, Elizalde N, Delagrange P, Tordera RM. Chronic social defeat stress model: behavioral features, antidepressant action, and interaction with biological risk factors. Psychopharmacology (Berl) 2012; 224:313-25. [PMID: 22707231 DOI: 10.1007/s00213-012-2754-5] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Accepted: 05/21/2012] [Indexed: 11/30/2022]
Abstract
RATIONALE Chronic social defeat stress (CSDS) has been proposed as a model of depression. However, most CSDS studies rely only on the analysis of stress-induced social avoidance. Moreover, the predictive validity of the model has been poorly analyzed, let alone its interaction with biological risk factors. OBJECTIVES Here, we explore the validity of CSDS as a depression model. Further, the effect of decreased vesicular glutamate transporter 1 (VGLUT1), as a potential factor enhancing a depressive-like phenotype, was studied. METHODS Mice were exposed to CSDS (10 days) followed by saline, venlafaxine, fluoxetine, or tianeptine treatment (30 days). The battery of behaviors included motor activity, memory, anxiety, social interaction, helplessness, and anhedonic-like behavior. Moreover, the behavioral effect of CSDS in VGLUT1 heterozygous (VGLUT1+/-) mice was studied, as well as the regulation of VGLUT1 mRNA. RESULTS CSDS induced anhedonia, helplessness, hyperactivity, anxiety, social avoidance, and freezing, as well as downregulation of VGLUT1 mRNA in the amygdala. Repeated venlafaxine showed antidepressant-like activity and both venlafaxine and tianeptine behaved as effective anxiolytics. CSDS-induced social avoidance was reverted by tianeptine. Fluoxetine failed to revert most of the behavioral alterations. VGLUT1+/- mice showed an enhanced vulnerability to stress-induced social avoidance. CONCLUSION We suggest that CSDS is not a pure model of depression. Indeed, it addresses relevant aspects of anxiety-related disorders. Firstly, CSDS-induced anhedonia and social avoidance are not associated in this model. Moreover, CSDS might be affecting brain areas mainly involved in the processing of social behavior, such as the amygdala, where the glutamatergic mechanism could play a key role.
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Affiliation(s)
- E Venzala
- Department of Pharmacology, University of Navarra, 31080 Pamplona, Spain
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Molecular adaptation to chronic antidepressant treatment: evidence for a more rapid response to the novel α₂-adrenoceptor antagonist/5-HT-noradrenaline reuptake inhibitor (SNRI), S35966, compared to the SNRI, venlafaxine. Int J Neuropsychopharmacol 2012; 15:617-29. [PMID: 21733241 DOI: 10.1017/s1461145711000733] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Evidence of early changes in neural plasticity may aid the prediction of rapid-onset antidepressant drugs. Here we compared the dual α₂-adrenoceptor antagonist/5-HT-noradrenaline reuptake inhibitor (SNRI), S35966, to the SNRI, venlafaxine, with regards to their effect on rat brain expression of a panel of neural plasticity-related genes: Arc, BDNF, and VGLUT1, as well as Homer1a and Shank1B (not studied previously). Abundance of mRNA was determined by in-situ hybridization in cortical and hippocampal regions 2 h and 16 h following drug administration for 14, 7 and 1 d. After 14 d, both S35966 and venlafaxine increased mRNA of all genes, including Homer1a and Shank1B, and effects were similarly time- and region-dependent. After 7 d, S35966 elevated Arc, Shank1B and BDNF mRNA, whereas venlafaxine increased Shank1B mRNA only. Finally, after 1 d (acute administration), S35966 increased Arc and Homer1a mRNA whereas venlafaxine had no effect on any gene examined. In summary, a 14-d course of treatment with S35966 or venlafaxine induced similar region- and time-dependent increases in expression of neural plasticity-related genes including Shank1B and Homer1a. Some genes responded earlier to S35966, suggesting that drugs with combined α₂-adrenoceptor antagonist/SNRI properties may elicit more rapid changes in markers of neural plasticity than a SNRI alone.
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Post RM, Fleming J, Kapczinski F. Neurobiological correlates of illness progression in the recurrent affective disorders. J Psychiatr Res 2012; 46:561-73. [PMID: 22444599 DOI: 10.1016/j.jpsychires.2012.02.004] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Revised: 01/02/2012] [Accepted: 02/09/2012] [Indexed: 11/19/2022]
Abstract
Some clinical aspects of affective illness progression, such as episode-, stress-, and substance-induced sensitization, have been well documented in the literature, but others have received less attention. These include cognitive deficits, treatment-refractoriness, and neurobiological correlates of illness progression, which are the primary focus of this paper. We review the evidence that cognitive dysfunction, treatment resistance, medical comorbidities, and neurobiological abnormalities increase as a function of the number of prior episodes or duration of illness in the recurrent unipolar and bipolar disorders. Substantial evidence supports the view that cognitive dysfunction and vulnerability to a diagnosis of dementia in old age increases as a function of number of prior mood episodes as does non-response to many therapeutic interventions as well as naturalistic treatment. Neurobiological abnormalities that correlate with the number of mood episodes or duration of illness include: anatomical, functional, and biochemical deficits in the prefrontal cortex and hippocampus, as well as amygdala hyperactivity and cortisol hyper-secretion. Some neurotrophic factors and inflammatory markers may also change with greater illness burden. Causality cannot be inferred from these correlative relationships. Nonetheless, given the potentially grave consequences of episode recurrence and progression for morbidity and treatment non-responsiveness, it is clinically wise to assume episodes are causing some of the progressive cognitive and neurobiological abnormalities. As such, earlier and more sustained long-term prophylaxis to attempt to reduce these adverse outcomes is indicated.
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Affiliation(s)
- Robert M Post
- Bipolar Collaborative Network, 5415 W Cedar Lane, Suite 201-B, Bethesda, MD 20814, United States.
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36
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Sidor MM. Psychiatry's age of enlightenment: optogenetics and the discovery of novel targets for the treatment of psychiatric disorders. J Psychiatry Neurosci 2012; 37:4-6. [PMID: 22182794 PMCID: PMC3244493 DOI: 10.1503/jpn.110175] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Michelle M. Sidor
- Correspondence to: Dr. M.M. Sidor, Department of Psychiatry, University of Pittsburgh School of Medicine, 450 Technology Dr., Ste 223, Pittsburgh PA 15219;
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37
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A role for repressive histone methylation in cocaine-induced vulnerability to stress. Neuron 2011; 71:656-70. [PMID: 21867882 DOI: 10.1016/j.neuron.2011.06.007] [Citation(s) in RCA: 217] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/02/2011] [Indexed: 12/15/2022]
Abstract
Substance abuse increases an individual's vulnerability to stress-related illnesses, which is presumably mediated by drug-induced neural adaptations that alter subsequent responses to stress. Here, we identify repressive histone methylation in nucleus accumbens (NAc), an important brain reward region, as a key mechanism linking cocaine exposure to increased stress vulnerability. Repeated cocaine administration prior to subchronic social defeat stress potentiated depressive-like behaviors in mice through decreased levels of histone H3 lysine 9 dimethylation in NAc. Cre-mediated reduction of the histone methyltransferase, G9a, in NAc promoted increased susceptibility to social stress, similar to that observed with repeated cocaine. Conversely, G9a overexpression in NAc after repeated cocaine protected mice from the consequences of subsequent stress. This resilience was mediated, in part, through repression of BDNF-TrkB-CREB signaling, which was induced after repeated cocaine or stress. Identifying such common regulatory mechanisms may aid in the development of new therapies for addiction and depression.
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38
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McClung CA. Circadian rhythms and mood regulation: insights from pre-clinical models. Eur Neuropsychopharmacol 2011; 21 Suppl 4:S683-93. [PMID: 21835596 PMCID: PMC3179573 DOI: 10.1016/j.euroneuro.2011.07.008] [Citation(s) in RCA: 120] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2011] [Revised: 07/06/2011] [Accepted: 07/13/2011] [Indexed: 12/13/2022]
Abstract
Affective disorders such as major depression, bipolar disorder, and seasonal affective disorder are associated with major disruptions in circadian rhythms. Indeed, altered sleep/wake cycles are a critical feature for diagnosis in the DSM IV and several of the therapies used to treat these disorders have profound effects on rhythm length and stabilization in human populations. Furthermore, multiple human genetic studies have identified polymorphisms in specific circadian genes associated with these disorders. Thus, there appears to be a strong association between the circadian system and mood regulation, although the mechanisms that underlie this association are unclear. Recently, a number of studies in animal models have begun to shed light on the complex interactions between circadian genes and mood-related neurotransmitter systems, the effects of light manipulation on brain circuitry, the impact of chronic stress on rhythms, and the ways in which antidepressant and mood-stabilizing drugs alter the clock. This review will focus on the recent advances that have been gleaned from the use of pre-clinical models to further our understanding of how the circadian system regulates mood.
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Affiliation(s)
- Colleen A McClung
- Department of Psychiatry, University of Pittsburgh Medical School, 450 Technology Dr. Suite 223, Pittsburgh, PA 15219, United States.
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39
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Chuang JC, Krishnan V, Yu HG, Mason B, Cui H, Wilkinson MB, Zigman JM, Elmquist JK, Nestler EJ, Lutter M, Lutter M. A beta3-adrenergic-leptin-melanocortin circuit regulates behavioral and metabolic changes induced by chronic stress. Biol Psychiatry 2010; 67:1075-82. [PMID: 20060958 PMCID: PMC2868111 DOI: 10.1016/j.biopsych.2009.12.003] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2009] [Revised: 11/20/2009] [Accepted: 12/01/2009] [Indexed: 10/20/2022]
Abstract
BACKGROUND Obesity has been associated with an increased risk of developing several psychiatric illnesses, including major depression and posttraumatic stress disorder. Likewise, these stress-related disturbances are associated with a higher rate of obesity; yet, the neurobiological mechanisms linking obesity and stress remain incompletely understood. METHODS Following exposure to chronic social defeat stress (CSDS), mice were given free access to either regular chow or a Western-style diet high in triglycerides and cholesterol. Comprehensive metabolic and behavioral testing was then conducted. RESULTS Mice subjected to CSDS and then fed a high-fat diet for 30 days display severe behavioral deficits accompanied by redistribution of body fat. Stressed mice have decreased adipose tissue as well as decreased serum leptin levels compared with control mice. Pharmacological inhibition of beta(3)-adrenergic signaling during CSDS normalizes these metabolic abnormalities but worsens behavioral symptoms. Furthermore, mice subjected to CSDS display central leptin resistance including reduced expression of pro-opiomelanocortin in hypothalamus. Administration of a central melanocortin agonist worsens stress-induced behavioral deficits, while mice lacking the melanocortin-4 receptor display attenuated symptoms. CONCLUSIONS These results indicate that chronic signaling through beta(3)-adrenergic receptors during social stress is an adaptive response that improves behavioral function. However, these responses come at the expense of central leptin resistance and melanocortin signaling alterations that contribute to significant and long-lasting metabolic abnormalities.
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Affiliation(s)
- Jen-Chieh Chuang
- Department of Internal Medicine (Division of Hypothalamic Research), The University of Texas Southwestern Medical Center, Dallas, TX, 75390
| | - Vaishnav Krishnan
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
| | - Hana G. Yu
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
| | - Brittany Mason
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
| | - Huixing Cui
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
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Department of Internal Medicine (Division of Hypothalamic Research), The University of Texas Southwestern Medical Center, Dallas, TX, 75390
| | - Matthew B. Wilkinson
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, New York, NY, 10029-6574
| | - Jeffrey M. Zigman
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
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Department of Internal Medicine (Division of Hypothalamic Research), The University of Texas Southwestern Medical Center, Dallas, TX, 75390
| | - Joel K. Elmquist
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
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Department of Internal Medicine (Division of Hypothalamic Research), The University of Texas Southwestern Medical Center, Dallas, TX, 75390
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Department of Pharmacology, The University of Texas Southwestern Medical Center, Dallas, TX, 75390
| | - Eric J. Nestler
- Fishberg Department of Neuroscience, Mount Sinai School of Medicine, New York, NY, 10029-6574
| | - Michael Lutter
- Department of Psychiatry, The University of Texas Southwestern Medical Center, Dallas, TX 75390-9127
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Department of Internal Medicine (Division of Hypothalamic Research), The University of Texas Southwestern Medical Center, Dallas, TX, 75390
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To whom correspondence should be addressed.
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40
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Chuang JC, Cui H, Mason BL, Mahgoub M, Bookout AL, Yu HG, Perello M, Elmquist JK, Repa JJ, Zigman JM, Lutter M. Chronic social defeat stress disrupts regulation of lipid synthesis. J Lipid Res 2010; 51:1344-53. [PMID: 20129912 DOI: 10.1194/jlr.m002196] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Several psychiatric disorders increase the risk of cardiovascular disease, including posttraumatic stress disorder and major depression. While the precise mechanism for this association has not yet been established, it has been shown that certain disorders promote an unfavorable lipid profile. To study the interaction of stress and lipid dysregulation, we utilized chronic social defeat stress (CSDS), a mouse model of chronic stress with features of posttraumatic stress disorder and major depression. Following exposure to CSDS, mice were given access to either regular chow or a Western-style diet high in fat and cholesterol (HFD). The combination of social stress and HFD resulted in significant perturbations in lipid regulation, including two key features of the metabolic syndrome: increased plasma levels of non-HDL cholesterol and intrahepatic accumulation of triglycerides. These effects were accompanied by a number of changes in the expression of hepatic genes involved in lipid regulation. Transcriptional activity of LXR, SREBP1c, and ChREBP were significantly affected by exposure to HFD and CSDS. We present CSDS as a model of social stress induced lipid dysregulation and propose that social stress alters lipid metabolism by increasing transcriptional activity of genes involved in lipid synthesis.
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Affiliation(s)
- Jen-Chieh Chuang
- Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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41
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Peripheral brain-derived neurotrophic factor (BDNF) as a biomarker for affective disorders? Int J Neuropsychopharmacol 2010; 13:1-4. [PMID: 19995480 DOI: 10.1017/s1461145709991039] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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42
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Lutter M, Elmquist J. Depression and metabolism: linking changes in leptin and ghrelin to mood. F1000 BIOLOGY REPORTS 2009; 1:63. [PMID: 20948621 PMCID: PMC2948264 DOI: 10.3410/b1-63] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Major depressive disorder is associated with an elevated risk of numerous metabolic disturbances, including obesity, metabolic syndrome, insulin-dependent diabetes mellitus type II, and death after myocardial infarction. Several recent papers also indicate that disturbances of mood may alter peripheral signaling pathways that regulate metabolic processes, including those involving leptin and ghrelin.
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Affiliation(s)
- Michael Lutter
- Department of Psychiatry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9127, USA.
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