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Rauhut AS, Tuladhar B, Tamvaka N, Warnick J. Differential effects of voluntary exercise and housing density on anxiety-like behavior in C57Bl/6 mice. Behav Processes 2024; 217:105023. [PMID: 38522795 DOI: 10.1016/j.beproc.2024.105023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 03/15/2024] [Accepted: 03/21/2024] [Indexed: 03/26/2024]
Abstract
The interaction of voluntary exercise and housing density on a) anxiety-like behavior and b) the stimulant effects of methamphetamine in C57Bl/6 mice were evaluated. Upon arrival, mice were housed singly or in pairs, and permitted access to home-cage running wheels or not for 4 weeks. Testing for anxiety-like behavior occurred over the next 3 weeks, one test per week [Elevated-Plus Maze (EPM) → Hyponeophagia (HNP) task → Open-Field (OF) task]. The final, OF task involved an 8-hour session in which mice were permitted to explore the chamber (drug free) during Hours 1-3; given an injection (s.c.) of methamphetamine (1.0 mg/kg) after Hour 3; followed by continued behavioral sampling during Hours 4-8. Several tasks (HNP and OF, but not EPM) consistently showed voluntary exercise induced anxiety-like behavior. In addition, two measures (time in center and time resting in the perimeter) in the OF task revealed that exercise mice compared to controls were more responsive to the anxiogenic effects of methamphetamine. Although pair housing was anxiolytic, it did not ameliorate the anxiogenic effects of voluntary exercise. Taken together, these results, when viewed in tandem with previous studies that utilized a less anxious mouse strain (Swiss Webster), may suggest that voluntary exercise is anxiogenic in an anxiety-prone mouse strain such as C57Bl/6 and highlight the importance of considering mouse strain when evaluating the impact of environmental manipulations on anxiety-like behavior in animal models.
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Affiliation(s)
- Anthony S Rauhut
- Psychology Department, Dickinson College, Carlisle 17013, PA; Neuroscience Program, Dickinson College, Carlisle 17013, PA.
| | | | - Nicole Tamvaka
- Neuroscience Program, Dickinson College, Carlisle 17013, PA
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2
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Dos Anjos-Garcia T, Kanashiro A, de Campos AC, Coimbra NC. Environmental Enrichment Facilitates Anxiety in Conflict-Based Tests but Inhibits Predator Threat-Induced Defensive Behaviour in Male Mice. Neuropsychobiology 2022; 81:225-236. [PMID: 35026760 DOI: 10.1159/000521184] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 11/24/2021] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Environmental enrichment (EE) is a useful and sophisticated tool that improves rodents' well-being by stimulating social behaviour and cognitive, motor, and sensory functions. Exposure to EE induces neuroplasticity in different brain areas, including the limbic system, which has been implicated in the control of anxiety and fear. However, the effects of EE on ethologically relevant naturalistic behaviours, such as those displayed by prey in the presence of predators, remain largely unexplored. MATERIAL AND METHODS In the present study, we investigated anxiety- and panic attack-like behaviours in a predator (cat)-prey confrontation paradigm and compared them with those in classical assays, such as the elevated plus-maze (EPM), marble-burying, and open field tests (OFTs), using C57BL/6J male mice housed in enriched or standard environments for 6 weeks. RESULTS We observed that EE exposure caused enhancement of the levels of anxiety-like behaviours in the EPM and OFTs, increasing risk assessment (an anxiety-related response), and decreasing escape (a panic attack-like response) behaviours during exposure to the predator versus prey confrontation paradigm. CONCLUSION Taken together, our findings suggest that enriched external environments can modify the processing of fear- and anxiety-related stimuli in dangerous situations, changing the decision-making defensive strategy.
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Affiliation(s)
- Tayllon Dos Anjos-Garcia
- Department of Pharmacology, Laboratory of Neuroanatomy and Neuropsychobiology, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil.,NAP-USP-Neurobiology of Emotions Research Centre (NuPNE), Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil.,Behavioural Neurosciences Institute (INeC), São Paulo, Brazil.,Ophidiarium LNN-FMRP-USP/INeC, Ribeirão Preto Medical School of the University of São Paulo, São Paulo, Brazil
| | - Alexandre Kanashiro
- Department of Pharmacology, Laboratory of Neuroanatomy and Neuropsychobiology, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil.,NAP-USP-Neurobiology of Emotions Research Centre (NuPNE), Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil.,Ophidiarium LNN-FMRP-USP/INeC, Ribeirão Preto Medical School of the University of São Paulo, São Paulo, Brazil.,Division of Neurology, Department of Neuroscience and Behavioural Sciences, Post-Graduation Program in Neurology/Neurosciences, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil
| | - Alline Cristina de Campos
- Department of Pharmacology, Pharmacology of Neuroplasticity Laboratory, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil
| | - Norberto Cysne Coimbra
- Department of Pharmacology, Laboratory of Neuroanatomy and Neuropsychobiology, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil.,NAP-USP-Neurobiology of Emotions Research Centre (NuPNE), Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil.,Behavioural Neurosciences Institute (INeC), São Paulo, Brazil.,Ophidiarium LNN-FMRP-USP/INeC, Ribeirão Preto Medical School of the University of São Paulo, São Paulo, Brazil.,Division of Neurology, Department of Neuroscience and Behavioural Sciences, Post-Graduation Program in Neurology/Neurosciences, Ribeirão Preto Medical School of the University of São Paulo (FMRP-USP), São Paulo, Brazil
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Abstract
In the adult mammalian hippocampus, new neurons arise from stem and progenitor cell division, in a process known as adult neurogenesis. Adult-generated neurons are sensitive to experience and may participate in hippocampal functions, including learning and memory, anxiety and stress regulation, and social behavior. Increasing evidence emphasizes the importance of new neuron connectivity within hippocampal circuitry for understanding the impact of adult neurogenesis on brain function. In this Review, we discuss how the functional consequences of new neurons arise from the collective interactions of presynaptic and postsynaptic neurons, glial cells, and the extracellular matrix, which together form the "tetrapartite synapse."
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Affiliation(s)
- Elise C Cope
- Princeton Neuroscience Institute and Department of Psychology, Princeton University, Princeton, NJ 08544, USA
| | - Elizabeth Gould
- Princeton Neuroscience Institute and Department of Psychology, Princeton University, Princeton, NJ 08544, USA.
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4
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Dong Z, Liu Z, Liu Y, Zhang R, Mo H, Gao L, Shi Y. Physical exercise rectifies CUMS-induced aberrant regional homogeneity in mice accompanied by the adjustment of skeletal muscle PGC-1a/IDO1 signals and hippocampal function. Behav Brain Res 2020; 383:112516. [DOI: 10.1016/j.bbr.2020.112516] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/11/2020] [Accepted: 01/27/2020] [Indexed: 12/21/2022]
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5
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Venezia AC, Hyer MM, Glasper ER, Roth SM, Quinlan EM. Acute forced exercise increases Bdnf IV mRNA and reduces exploratory behavior in C57BL/6J mice. GENES BRAIN AND BEHAVIOR 2019; 19:e12617. [PMID: 31621198 DOI: 10.1111/gbb.12617] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 10/08/2019] [Accepted: 10/10/2019] [Indexed: 12/25/2022]
Abstract
Acute exercise has been shown to improve memory in humans. Potential mechanisms include increased Bdnf expression, noradrenergic activity and modification of glutamate receptors. Because mice are commonly used to study exercise and brain plasticity, it is important to explore how acute exercise impacts behavior in this model. C57BL/6J mice were assigned to three groups: control, moderate-intensity running, and high-intensity running. Control mice were placed on a stationary treadmill for 30 minutes and moderate- and high-intensity mice ran for 30 minutes at 12 and 15-17 m/min, respectively. Mice were sacrificed immediately after running and the hippocampus removed. Total Bdnf, Bdnf exon IV, and glutamate receptor subunits were quantified with quantitative polymerase chain reaction. Total and phosphorylated GluR1 (Ser845 and Ser831) protein was quantified following immunoblotting. Utilizing the same protocol for control and high-intensity running, object location memory was examined in a separate cohort of mice. Anxiety-like behavior was assessed in the open field task (OFT) in a third cohort of mice that were separated into four groups: control-saline, control-DSP-4, acute exercise-saline, and acute exercise-DSP-4. DSP-4 was used to lesion the central noradrenergic system. We observed higher Bdnf IV mRNA in high-intensity runners compared to controls, but no effects of acute exercise on memory. In the OFT, runners traveled less distance and spent more time grooming than controls. DSP-4 did not attenuate the effects of exercise. A single bout of exercise increases Bdnf IV mRNA in an intensity-dependent manner; however, high-intensity running reduces exploratory behavior in C57BL/6J mice.
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Affiliation(s)
- Andrew C Venezia
- Department of Exercise Science and Sport, The University of Scranton, Scranton, Pennsylvania
| | - Molly M Hyer
- Department of Psychology, University of Maryland, College Park, Maryland
| | - Erica R Glasper
- Department of Psychology, University of Maryland, College Park, Maryland
| | - Stephen M Roth
- Department of Kinesiology, School of Public Health, University of Maryland, College Park, Maryland
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6
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Chen YW, Actor-Engel H, Aoki C. α4-GABA A receptors of hippocampal pyramidal neurons are associated with resilience against activity-based anorexia for adolescent female mice but not for males. Mol Cell Neurosci 2018; 90:33-48. [PMID: 29684457 PMCID: PMC6197931 DOI: 10.1016/j.mcn.2018.04.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 04/14/2018] [Accepted: 04/19/2018] [Indexed: 11/23/2022] Open
Abstract
Activity-based anorexia (ABA) is an animal model of anorexia nervosa, a mental illness with highest mortality and with onset that is most frequently during adolescence. We questioned whether vulnerability of adolescent mice to ABA differs between sexes and whether individual differences in resilience are causally linked to α4βδ-GABAAR expression. C57BL6/J WT and α4-KO adolescent male and female mice underwent ABA induction by combining wheel access with food restriction. ABA vulnerability was measured as the extent of food restriction-evoked hyperactivity on a running wheel and body weight losses. α4βδ-GABAAR levels at plasma membranes of pyramidal cells in dorsal hippocampus were assessed by electron microscopic immunocytochemistry. Temporal patterns and extent of weight loss during ABA induction were similar between sexes. Both sexes also exhibited individual differences in ABA vulnerability. Correlation analyses revealed that, for both sexes, body weight changes precede and thus are likely to drive suppression of wheel running. However, the suppression was during the food-anticipatory hours for males, while for females, suppression was delayed by a day and during food-access hours. Correspondingly, only females adaptively increased food intake. ABA induced up-regulation of α4βδ-GABAARs at plasma membranes of dorsal hippocampal pyramidal cells of females, and especially those females exhibiting resilience. Conversely, α4-KO females exhibited greater food restriction-evoked hyperactivity than WT females. In contrast, ABA males did not up-regulate α4βδ-GABAARs, did not exhibit genotype differences in vulnerability, and exhibited no correlation between plasmalemmal α4βδ-GABAARs and ABA resilience. Thus, food restriction-evoked hyperactivity is driven by anxiety but can be suppressed through upregulation of hippocampal α4βδ-GABAARs for females but not for males. This knowledge of sex-related differences in the underlying mechanisms of resilience to ABA indicates that drugs targeting α4βδ-GABAARs may be helpful for treating stress-induced anxiety and anorexia nervosa of females but not males.
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Affiliation(s)
- Yi-Wen Chen
- Center for Neural Science, New York University, New York, NY 10003, United States
| | - Hannah Actor-Engel
- Center for Neural Science, New York University, New York, NY 10003, United States
| | - Chiye Aoki
- Center for Neural Science, New York University, New York, NY 10003, United States; Neuroscience Institute, Langone Medical Center, New York University, New York, NY, 10016, United States.
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7
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Saraulli D, Costanzi M, Mastrorilli V, Farioli-Vecchioli S. The Long Run: Neuroprotective Effects of Physical Exercise on Adult Neurogenesis from Youth to Old Age. Curr Neuropharmacol 2018; 15:519-533. [PMID: 27000776 PMCID: PMC5543673 DOI: 10.2174/1570159x14666160412150223] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 03/08/2016] [Accepted: 03/16/2016] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND The rapid lengthening of life expectancy has raised the problem of providing social programs to counteract the age-related cognitive decline in a growing number of older people. Physical activity stands among the most promising interventions aimed at brain wellbeing, because of its effective neuroprotective action and low social cost. The purpose of this review is to describe the neuroprotective role exerted by physical activity in different life stages. In particular, we focus on adult neurogenesis, a process which has proved being highly responsive to physical exercise and may represent a major factor of brain health over the lifespan. METHODS The most recent literature related to the subject has been reviewed. The text has been divided into three main sections, addressing the effects of physical exercise during childhood/ adolescence, adulthood and aging, respectively. For each one, the most relevant studies, carried out on both human participants and rodent models, have been described. RESULTS The data reviewed converge in indicating that physical activity exerts a positive effect on brain functioning throughout the lifespan. However, uncertainty remains about the magnitude of the effect and its biological underpinnings. Cellular and synaptic plasticity provided by adult neurogenesis are highly probable mediators, but the mechanism for their action has yet to be conclusively established. CONCLUSION Despite alternative mechanisms of action are currently debated, age-appropriate physical activity programs may constitute a large-scale, relatively inexpensive and powerful approach to dampen the individual and social impact of age-related cognitive decline.
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Affiliation(s)
- Daniele Saraulli
- Institute of Cell Biology and Neurobiology, National Research Council, & Fondazione S. Lucia, Rome. Italy
| | - Marco Costanzi
- Department of Human Sciences, LUMSA University, Rome. Italy
| | - Valentina Mastrorilli
- Institute of Cell Biology and Neurobiology, National Research Council, & Fondazione S. Lucia, Rome. Italy
| | - Stefano Farioli-Vecchioli
- Institute of Cell Biology and Neurobiology, National Research Council, Via del Fosso di Fiorano 64, 00143 Rome. Italy
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8
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Morgan JA, Singhal G, Corrigan F, Jaehne EJ, Jawahar MC, Baune BT. The effects of aerobic exercise on depression-like, anxiety-like, and cognition-like behaviours over the healthy adult lifespan of C57BL/6 mice. Behav Brain Res 2018; 337:193-203. [DOI: 10.1016/j.bbr.2017.09.022] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Revised: 09/08/2017] [Accepted: 09/11/2017] [Indexed: 12/20/2022]
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9
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Lynch KS. Region-specific neuron recruitment in the hippocampus of brown-headed cowbirds Molothrus ater (Passeriformes: Icteridae). THE EUROPEAN ZOOLOGICAL JOURNAL 2018. [DOI: 10.1080/24750263.2018.1435743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Affiliation(s)
- Kathleen S. Lynch
- Department of Biological Sciences, Hofstra University, Hempstead, NY, USA
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10
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Braun DJ, Kalinin S, Feinstein DL. Conditional Depletion of Hippocampal Brain-Derived Neurotrophic Factor Exacerbates Neuropathology in a Mouse Model of Alzheimer's Disease. ASN Neuro 2017; 9:1759091417696161. [PMID: 28266222 PMCID: PMC5415058 DOI: 10.1177/1759091417696161] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Damage occurring to noradrenergic neurons in the locus coeruleus (LC) contributes to the evolution of neuroinflammation and neurodegeneration in a variety of conditions and diseases. One cause of LC damage may be loss of neurotrophic support from LC target regions. We tested this hypothesis by conditional unilateral knockout of brain-derived neurotrophic factor (BDNF) in adult mice. To evaluate the consequences of BDNF loss in the context of neurodegeneration, the mice harbored familial mutations for human amyloid precursor protein and presenilin-1. In these mice, BDNF depletion reduced tyrosine hydroxylase staining, a marker of noradrenergic neurons, in the rostral LC. BDNF depletion also reduced noradrenergic innervation in the hippocampus, the frontal cortex, and molecular layer of the cerebellum, assessed by staining for dopamine beta hydroxylase. BDNF depletion led to an increase in cortical amyloid plaque numbers and size but was without effect on plaque numbers in the striatum, a site with minimal innervation from the LC. Interestingly, cortical Iba1 staining for microglia was reduced by BDNF depletion and was correlated with reduced dopamine beta hydroxylase staining. These data demonstrate that reduction of BDNF levels in an LC target region can cause retrograde damage to LC neurons, leading to exacerbation of neuropathology in distinct LC target areas. Methods to reduce BDNF loss or supplement BDNF levels may be of value to reduce neurodegenerative processes normally limited by LC noradrenergic activities.
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Affiliation(s)
- David J Braun
- 1 Department of Anesthesiology, University of Illinois, Chicago, IL, USA
| | - Sergey Kalinin
- 1 Department of Anesthesiology, University of Illinois, Chicago, IL, USA
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11
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Huang P, Dong Z, Huang W, Zhou C, Zhong W, Hu P, Wen G, Sun X, Hua H, Cao H, Gao L, Lv Z. Voluntary wheel running ameliorates depression-like behaviors and brain blood oxygen level-dependent signals in chronic unpredictable mild stress mice. Behav Brain Res 2017; 330:17-24. [DOI: 10.1016/j.bbr.2017.05.032] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/08/2017] [Accepted: 05/10/2017] [Indexed: 11/29/2022]
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12
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Alves ND, Correia JS, Patrício P, Mateus-Pinheiro A, Machado-Santos AR, Loureiro-Campos E, Morais M, Bessa JM, Sousa N, Pinto L. Adult hippocampal neuroplasticity triggers susceptibility to recurrent depression. Transl Psychiatry 2017; 7:e1058. [PMID: 28291258 PMCID: PMC5416672 DOI: 10.1038/tp.2017.29] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Accepted: 01/09/2017] [Indexed: 12/21/2022] Open
Abstract
Depression is a highly prevalent and recurrent neuropsychiatric disorder associated with alterations in emotional and cognitive domains. Neuroplastic phenomena are increasingly considered central to the etiopathogenesis of and recovery from depression. Nevertheless, a high number of remitted patients experience recurrent episodes of depression, remaining unclear how previous episodes impact on behavior and neuroplasticity and/or whether modulation of neuroplasticity is important to prevent recurrent depression. Through re-exposure to an unpredictable chronic mild stress protocol in rats, we observed the re-appearance of emotional and cognitive deficits. Furthermore, treatment with the antidepressants fluoxetine and imipramine was effective to promote sustained reversion of a depressive-like phenotype; however, their differential impact on adult hippocampal neuroplasticity triggered a distinct response to stress re-exposure: while imipramine re-established hippocampal neurogenesis and neuronal dendritic arborization contributing to resilience to recurrent depressive-like behavior, stress re-exposure in fluoxetine-treated animals resulted in an overproduction of adult-born neurons along with neuronal atrophy of granule neurons, accounting for an increased susceptibility to recurrent behavioral changes typical of depression. Strikingly, cell proliferation arrest compromised the behavior resilience induced by imipramine and buffered the susceptibility to recurrent behavioral changes promoted by fluoxetine. This study shows that previous exposure to a depressive-like episode impacts on the behavioral and neuroanatomical changes triggered by subsequent re-exposure to similar experimental conditions and reveals that the proper control of adult hippocampal neuroplasticity triggered by antidepressants is essential to counteract recurrent depressive-like episodes.
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Affiliation(s)
- N D Alves
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - J S Correia
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - P Patrício
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - A Mateus-Pinheiro
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - A R Machado-Santos
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - E Loureiro-Campos
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - M Morais
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - J M Bessa
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - N Sousa
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - L Pinto
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal,Dr L Pinto, Life and Health Sciences Institute (ICVS), School of Medicine, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. E-mail:
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Schoenfeld TJ, McCausland HC, Sonti AN, Cameron HA. Anxiolytic Actions of Exercise in Absence of New Neurons. Hippocampus 2016; 26:1373-1378. [PMID: 27571506 DOI: 10.1002/hipo.22649] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/23/2016] [Indexed: 11/07/2022]
Abstract
Physical exercise reduces anxiety-like behavior in adult mice. The specific mechanisms that mediate this anxiolytic effect are unclear, but adult neurogenesis in the dentate gyrus has been implicated because it is robustly increased by running and has been linked to anxiodepressive-like behavior. We therefore tested the effects of long-term wheel running on anxiety-like behavior in GFAP-TK (TK) mice, a transgenic strain with complete ablation of adult neurogenesis. Five weeks of running reduced anxiety-like behavior equally in both TK mice and wild type (WT) control mice on two tests, elevated plus-maze and novelty-suppressed feeding. WT and TK mice also had similar patterns of c-fos expression in the hippocampus following anxiety testing. Following testing on the elevated plus-maze, running reduced c-fos expression in the dorsal dentate gyrus and CA3 in both WT and TK mice. Following testing on novelty-suppressed feeding, running reduced c-fos expression throughout the dentate gyrus and CA3 in both WT and TK mice. Interestingly, following testing on a less anxiogenic version of novelty-suppressed feeding, running reduced c-fos expression only in the dorsal dentate gyrus in both WT and TK mice, supporting earlier suggestions that the dorsal hippocampus is less involved in emotional behavior than the ventral region. These results suggest that although running increases adult neurogenesis, new neurons are not involved in the decreased anxiety-like behavior or hippocampal activation produced by running. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Timothy J Schoenfeld
- National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland.
| | - Hayley C McCausland
- National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland
| | - Anup N Sonti
- National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland
| | - Heather A Cameron
- National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland
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14
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White SL, Vassoler FM, Schmidt HD, Pierce RC, Wimmer ME. Enhanced anxiety in the male offspring of sires that self-administered cocaine. Addict Biol 2016; 21:802-810. [PMID: 25923597 DOI: 10.1111/adb.12258] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We previously showed that paternal cocaine exposure reduced the reinforcing efficacy of cocaine in male offspring. Here, we sought to determine whether paternal cocaine experience could also influence anxiety levels in offspring. Male rats were allowed to self-administer cocaine (controls received saline passively) for 60 days and then were bred with naïve females. Measures of anxiety and cocaine-induced anxiogenic effects were assessed in the adult offspring. Cocaine-sired male offspring exhibited increased anxiety-like behaviors, as measured using the novelty-induced hypophagia and defensive burying tasks, relative to saline-sired males. In contrast, sire cocaine experience had no effect on anxiety-like behaviors in female offspring. When challenged with an anxiogenic (but not anorectic) dose of cocaine (2.5 mg/kg, i.p.), anxiety-like behavior was enhanced in all animals to an equal degree regardless of sire drug experience. Since anxiety and depression are often co-morbid, we also assessed measures of depressive-like behavior. Sire cocaine experience had no effect on depression-like behaviors, as measured by the forced swim task, among male offspring. In a separate group of naïve littermates, select neuronal correlates of anxiety were measured. Male offspring of cocaine-experienced sires showed increased mRNA and protein expression of corticotropin-releasing factor receptor 2 in the hippocampus. Together, these results indicate that cocaine-experienced sires produce male progeny that have increased baseline anxiety, which is unaltered by subsequent cocaine exposure.
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Affiliation(s)
- Samantha L. White
- Center for Neurobiology and Behavior; Department of Psychiatry; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
| | - Fair M. Vassoler
- Center for Neurobiology and Behavior; Department of Psychiatry; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
| | - Heath D. Schmidt
- Center for Neurobiology and Behavior; Department of Psychiatry; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
| | - R. Christopher Pierce
- Center for Neurobiology and Behavior; Department of Psychiatry; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
| | - Mathieu E. Wimmer
- Center for Neurobiology and Behavior; Department of Psychiatry; Perelman School of Medicine; University of Pennsylvania; Philadelphia PA USA
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15
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van Dijk RM, Lazic SE, Slomianka L, Wolfer DP, Amrein I. Large-scale phenotyping links adult hippocampal neurogenesis to the reaction to novelty. Hippocampus 2015; 26:646-57. [DOI: 10.1002/hipo.22548] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 10/23/2015] [Accepted: 11/02/2015] [Indexed: 01/25/2023]
Affiliation(s)
- R. Maarten van Dijk
- Institute of Anatomy; University of Zürich; Switzerland
- Neuroscience Center Zurich; University of Zurich and ETH Zurich; Zürich Switzerland
- Institute of Human Movement Sciences and Sport; Department of Health Sciences and Technology; ETH Zurich; Zürich Switzerland
| | - Stanley E. Lazic
- In Silico Lead Discovery, Novartis Institutes for Biomedical Research; Basel Switzerland
| | | | - David P. Wolfer
- Institute of Anatomy; University of Zürich; Switzerland
- Neuroscience Center Zurich; University of Zurich and ETH Zurich; Zürich Switzerland
- Institute of Human Movement Sciences and Sport; Department of Health Sciences and Technology; ETH Zurich; Zürich Switzerland
| | - Irmgard Amrein
- Institute of Anatomy; University of Zürich; Switzerland
- Neuroscience Center Zurich; University of Zurich and ETH Zurich; Zürich Switzerland
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Otsuka T, Nishii A, Amemiya S, Kubota N, Nishijima T, Kita I. Effects of acute treadmill running at different intensities on activities of serotonin and corticotropin-releasing factor neurons, and anxiety- and depressive-like behaviors in rats. Behav Brain Res 2015; 298:44-51. [PMID: 26542811 DOI: 10.1016/j.bbr.2015.10.055] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 10/20/2015] [Accepted: 10/29/2015] [Indexed: 10/22/2022]
Abstract
Accumulating evidence suggests that physical exercise can reduce and prevent the incidence of stress-related psychiatric disorders, including depression and anxiety. Activation of serotonin (5-HT) neurons in the dorsal raphe nucleus (DRN) is implicated in antidepressant/anxiolytic properties. In addition, the incidence and symptoms of these disorders may involve dysregulation of the hypothalamic-pituitary-adrenal axis that is initiated by corticotropin-releasing factor (CRF) neurons in the hypothalamic paraventricular nucleus (PVN). Thus, it is possible that physical exercise produces its antidepressant/anxiolytic effects by affecting these neuronal activities. However, the effects of acute physical exercise at different intensities on these neuronal activation and behavioral changes are still unclear. Here, we examined the activities of 5-HT neurons in the DRN and CRF neurons in the PVN during 30 min of treadmill running at different speeds (high speed, 25 m/min; low speed, 15m/min; control, only sitting on the treadmill) in male Wistar rats, using c-Fos/5-HT or CRF immunohistochemistry. We also performed the elevated plus maze test and the forced swim test to assess anxiety- and depressive-like behaviors, respectively. Acute treadmill running at low speed, but not high speed, significantly increased c-Fos expression in 5-HT neurons in the DRN compared to the control, whereas high-speed running significantly enhanced c-Fos expression in CRF neurons in the PVN compared with the control and low-speed running. Furthermore, low-speed running resulted in decreased anxiety- and depressive-like behaviors compared with high-speed running. These results suggest that acute physical exercise with mild and low stress can efficiently induce optimal neuronal activation that is involved in the antidepressant/anxiolytic effects.
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Affiliation(s)
- Tomomi Otsuka
- Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan
| | - Ayu Nishii
- Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan
| | - Seiichiro Amemiya
- Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan
| | - Natsuko Kubota
- Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan
| | - Takeshi Nishijima
- Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan
| | - Ichiro Kita
- Department of Human Health Science, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo192-0397, Japan.
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Pan-Vazquez A, Rye N, Ameri M, McSparron B, Smallwood G, Bickerdyke J, Rathbone A, Dajas-Bailador F, Toledo-Rodriguez M. Impact of voluntary exercise and housing conditions on hippocampal glucocorticoid receptor, miR-124 and anxiety. Mol Brain 2015; 8:40. [PMID: 26135882 PMCID: PMC4487841 DOI: 10.1186/s13041-015-0128-8] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 06/11/2015] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Lack of physical activity and increased levels of stress contribute to the development of multiple physical and mental disorders. An increasing number of studies relate voluntary exercise with greater resilience to psychological stress, a process that is highly regulated by the hypothalamic-pituitary-adrenal (HPA) axis. However, the molecular mechanisms underlying the beneficial effects of exercise on stress resilience are still poorly understood. Here we have studied the impact of long term exercise and housing conditions on: a) hippocampal expression of glucocorticoid receptor (Nr3c1), b) epigenetic regulation of Nr3c1 (DNA methylation at the Nr3c1-1F promoter and miR-124 expression), c) anxiety (elevated plus maze, EPM), and d) adrenal gland weight and adrenocorticotropic hormone receptor (Mc2r) expression. RESULTS Exercise increased Nr3c1 and Nr3c1-1F expression and decreased miR-124 levels in the hippocampus in single-housed mice, suggesting enhanced resilience to stress. The opposite was found for pair-housed animals. Bisulfite sequencing showed virtually no DNA methylation in the Nr3c1-1F promoter region. Single-housing increased the time spent on stretch attend postures. Exercise decreased the time spent at the open arms of the EPM, however, the mobility of the exercise groups was significantly lower. Exercise had opposite effects on the adrenal gland weight of single and pair-housed mice, while it had no effect on adrenal Mc2r expression. CONCLUSIONS These results suggest that exercise exerts a positive impact on stress resilience in single-housed mice that could be mediated by decreasing miR-124 and increasing Nr3c1 expression in the hippocampus. However, pair-housing reverses these effects possibly due to stress from dominance disputes between pairs.
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Affiliation(s)
- Alejandro Pan-Vazquez
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.,Present address: MRC Centre for Developmental Neurobiology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, SE1 1UL, United Kingdom
| | - Natasha Rye
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Mitra Ameri
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Bethan McSparron
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Gabriella Smallwood
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Jordan Bickerdyke
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Alex Rathbone
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Federico Dajas-Bailador
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom
| | - Maria Toledo-Rodriguez
- Queens Medical Centre, School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, United Kingdom.
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Piza-Palma C, Barfield ET, Brown JA, Hubka JC, Lusk C, Schonhar CA, Sweat SC, Grisel JE. Oral self-administration of EtOH: sex-dependent modulation by running wheel access in C57BL/6J mice. Alcohol Clin Exp Res 2015; 38:2387-95. [PMID: 25257288 DOI: 10.1111/acer.12519] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Accepted: 06/14/2014] [Indexed: 12/18/2022]
Abstract
BACKGROUND The effects of stress, including neuroendocrine and behavioral sequelae aimed at maintaining homeostasis, are associated with increased alcohol consumption. Because both stress and drinking are multifactorial, the mechanisms underlying the relationship are difficult to elucidate. We therefore employed an animal model investigating the influence of blocked access to a running wheel on drinking in C57BL/6J (B6) mice. METHODS In the first experiment, naïve, adult male and female subjects were individually housed for 2 weeks with 24-hour access to a running wheel and 12% ethanol (EtOH) in a 2-bottle, free choice paradigm. After determining baseline consumption and preference, experimental subjects had the running wheel placed in a locked position for 6 hours, and the EtOH bottle was removed during the first half of this period. Two subsequent experiments, again in adult, naïve B6 mice, examined the influence of locked running wheels on self-administration of 20% EtOH in a limited access paradigm, and blood EtOH concentrations (BECs) were determined on the final day of this protocol. RESULTS In all 3 studies, using both between- and within-subject analyses, females showed transient yet reliable increases in alcohol drinking during blocked access to a rotating activity, while drinking in male mice was largely insensitive to this manipulation, although both sexes showed appreciable BECs (>130 mg/dl in females and 80 mg/dl in males) following a 2-hour EtOH access period. CONCLUSIONS These data add to a burgeoning literature suggesting that the factors contributing to excessive alcohol use differ between males and females and that females may be especially sensitive to the influence of wheel manipulation. Elucidating the sex-dependent mechanisms mediating differences in alcohol sensitivity and response is critical to understanding the causes of alcoholism and in developing effective treatments and interventions.
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19
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Kwon SJ, Park J, Park SY, Song KS, Jung ST, Jung SB, Park IR, Choi WS, Kwon SO. Low-intensity treadmill exercise and/or bright light promote neurogenesis in adult rat brain. Neural Regen Res 2014; 8:922-9. [PMID: 25206384 PMCID: PMC4145925 DOI: 10.3969/j.issn.1673-5374.2013.10.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2012] [Accepted: 02/16/2013] [Indexed: 11/18/2022] Open
Abstract
The hippocampus is a brain region responsible for learning and memory functions. The purpose of this study was to investigate the effects of low-intensity exercise and bright light exposure on neurogenesis and brain-derived neurotrophic factor expression in adult rat hippocampus. Male Sprague-Dawley rats were randomly assigned to control, exercise, light, or exercise + light groups (n = 9 per group). The rats in the exercise group were subjected to treadmill exercise (5 days per week, 30 minutes per day, over a 4-week period), the light group rats were irradiated (5 days per week, 30 minutes per day, 10 000 lx, over a 4-week period), the exercise + light group rats were subjected to treadmill exercise in combination with bright light exposure, and the control group rats remained sedentary over a 4-week period. Compared with the control group, there was a significant increase in neurogenesis in the hippocampal dentate gyrus of rats in the exercise, light, and exercise + light groups. Moreover, the expression level of brain-derived neurotrophic factor in the rat hippocampal dentate gyrus was significantly higher in the exercise group and light group than that in the control group. Interestingly, there was no significant difference in brain-derived neurotrophic factor expression between the control group and exercise + light group. These results indicate that low-intensity treadmill exercise (first 5 minutes at a speed of 2 m/min, second 5 minutes at a speed of 5 m/min, and the last 20 minutes at a speed of 8 m/min) or bright-light exposure therapy induces positive biochemical changes in the brain. In view of these findings, we propose that moderate exercise or exposure to sunlight during childhood can be beneficial for neural development.
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Affiliation(s)
- Sung Jin Kwon
- Department of Physical Education, Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - Jeongsook Park
- Department of Anatomy and Neurobiology, Medical Research Center for Neural Dysfunction, Institute of Health Science, School of Medicine, Gyeongsang National University, Jinju 660-751, Republic of Korea
| | - So Yun Park
- Department of Anatomy and Neurobiology, Medical Research Center for Neural Dysfunction, Institute of Health Science, School of Medicine, Gyeongsang National University, Jinju 660-751, Republic of Korea
| | - Kwang Seop Song
- Department of Physical Education, Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - Sun Tae Jung
- Department of Physical Education, Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - So Bong Jung
- Department of Physical Education, Gyeongsang National University, Jinju 660-701, Republic of Korea
| | - Ik Ryeul Park
- Department of Liberal Arts, Gyeongnam National University of Science and Technology, Jinju 660-758, Republic of Korea
| | - Wan Sung Choi
- Department of Anatomy and Neurobiology, Medical Research Center for Neural Dysfunction, Institute of Health Science, School of Medicine, Gyeongsang National University, Jinju 660-751, Republic of Korea
| | - Sun Ok Kwon
- Department of Physical Education, Gyeongsang National University, Jinju 660-701, Republic of Korea
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20
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Modulation of GABAA receptor signaling increases neurogenesis and suppresses anxiety through NFATc4. J Neurosci 2014; 34:8630-45. [PMID: 24948817 DOI: 10.1523/jneurosci.0047-14.2014] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Correlative evidence suggests that GABAergic signaling plays an important role in the regulation of activity-dependent hippocampal neurogenesis and emotional behavior in adult mice. However, whether these are causally linked at the molecular level remains elusive. Nuclear factor of activated T cell (NFAT) proteins are activity-dependent transcription factors that respond to environmental stimuli in different cell types, including hippocampal newborn neurons. Here, we identify NFATc4 as a key activity-dependent transcriptional regulator of GABA signaling in hippocampal progenitor cells via an unbiased high-throughput genome-wide study. Next, we demonstrate that GABAA receptor (GABAAR) signaling modulates hippocampal neurogenesis through NFATc4 activity, which in turn regulates GABRA2 and GABRA4 subunit expression via binding to specific promoter responsive elements, as assessed by ChIP and luciferase assays. Furthermore, we show that selective pharmacological enhancement of GABAAR activity promotes hippocampal neurogenesis via the calcineurin/NFATc4 axis. Importantly, the NFATc4-dependent increase in hippocampal neurogenesis after GABAAR stimulation is required for the suppression of the anxiety response in mice. Together, these data provide a novel molecular insight into the regulation of the anxiety response in mice, suggesting that the GABAAR/NFATc4 axis is a druggable target for the therapy of emotional disorders.
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21
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Ago Y, Tanaka T, Ota Y, Kitamoto M, Imoto E, Takuma K, Matsuda T. Social crowding in the night-time reduces an anxiety-like behavior and increases social interaction in adolescent mice. Behav Brain Res 2014; 270:37-46. [DOI: 10.1016/j.bbr.2014.04.047] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/25/2014] [Accepted: 04/28/2014] [Indexed: 11/30/2022]
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22
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Turner JR, Ray R, Lee B, Everett L, Xiang J, Jepson C, Kaestner KH, Lerman C, Blendy JA. Evidence from mouse and man for a role of neuregulin 3 in nicotine dependence. Mol Psychiatry 2014; 19:801-10. [PMID: 23999525 PMCID: PMC3877725 DOI: 10.1038/mp.2013.104] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 07/12/2013] [Accepted: 07/18/2013] [Indexed: 12/31/2022]
Abstract
Addiction to nicotine and the ability to quit smoking are influenced by genetic factors. We used functional genomic approaches (chromatin immunoprecipitation (ChIP) and whole-genome sequencing) to identify cAMP response element-binding protein (CREB) targets following chronic nicotine administration and withdrawal (WD) in rodents. We found that chronic nicotine and WD differentially modulate CREB binding to the gene for neuregulin 3 (NRG3). Quantitative analysis of saline, nicotine and nicotine WD in two biological replicates corroborate this finding, with NRG3 increases in both mRNA and protein following WD from chronic nicotine treatment. To translate these data for human relevance, single-nucleotide polymorphisms (SNPs) across NRG3 were examined for association with prospective smoking cessation among smokers of European ancestry treated with transdermal nicotine in two independent cohorts. Individual SNP and haplotype analysis support the association of NRG3 SNPs and smoking cessation success. NRG3 is a neural-enriched member of the epidermal growth factor family, and a specific ligand for the receptor tyrosine kinase ErbB4, which is also upregulated following nicotine treatment and WD. Mice with significantly reduced levels of NRG3 or pharmacological inhibition of ErbB4 show similar reductions in anxiety following nicotine WD compared with control animals, suggesting a role for NRG3 in nicotine dependence. Although the function of the SNP in NRG3 in humans is not known, these data suggest that Nrg3/ErbB4 signaling may be an important factor in nicotine dependence.
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Affiliation(s)
- Jill R. Turner
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Riju Ray
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Bridgin Lee
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Logan Everett
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Jing Xiang
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Christopher Jepson
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Klaus H. Kaestner
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Caryn Lerman
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
| | - Julie A. Blendy
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104
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23
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Aoki C, Wable G, Chowdhury TG, Sabaliauskas NA, Laurino K, Barbarich-Marsteller NC. α4βδ-GABAARs in the hippocampal CA1 as a biomarker for resilience to activity-based anorexia. Neuroscience 2014; 265:108-23. [PMID: 24444828 PMCID: PMC3996507 DOI: 10.1016/j.neuroscience.2014.01.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 12/09/2013] [Accepted: 01/07/2014] [Indexed: 12/01/2022]
Abstract
Anorexia nervosa (AN) is a psychiatric illness characterized by restricted eating and an intense fear of gaining weight. Most individuals with AN are females, diagnosed first during adolescence, 40-80% of whom exhibit excessive exercise, and an equally high number with a history of anxiety disorder. We sought to determine the cellular basis for individual differences in AN vulnerability by using an animal model, activity-based anorexia (ABA), that is induced by combining food restriction (FR) with access to a running wheel that allows voluntary exercise. Previously, we showed that by the fourth day of FR, the ABA group of adolescent female rats exhibit >500% greater levels of non-synaptic α4βδ-GABAARs at the plasma membrane of hippocampal CA1 pyramidal cell spines, relative to the levels found in age-matched controls that are not FR and without wheel access. Here, we show that the ABA group exhibits individual differences in body weight loss, with some losing nearly 30%, while others lose only 15%. The individual differences in weight loss are ascribable to individual differences in wheel activity that both precedes and concurs with days of FR. Moreover, the increase in activity during FR correlates strongly and negatively with α4βδ-GABAAR levels (R=-0.9, p<0.01). This negative correlation is evident within 2days of FR, before body weight loss approaches life-threatening levels for any individual. These findings suggest that increased shunting inhibition by α4βδ-GABAARs in spines of CA1 pyramidal neurons may participate in the protection against the ABA-inducing environmental factors of severe weight loss by suppressing excitability of the CA1 pyramidal neurons which, in turn, is related indirectly to suppression of excessive exercise. The data also indicate that, although exercise has many health benefits, it can be maladaptive to individuals with low levels of α4βδ-GABAARs in the CA1, particularly when combined with FR.
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Affiliation(s)
- C Aoki
- Center for Neural Science, New York University, New York, NY 10003, United States.
| | - G Wable
- Center for Neural Science, New York University, New York, NY 10003, United States
| | - T G Chowdhury
- Center for Neural Science, New York University, New York, NY 10003, United States
| | - N A Sabaliauskas
- Center for Neural Science, New York University, New York, NY 10003, United States
| | - K Laurino
- Department of Psychiatry, College of Physicians and Surgeons of Columbia University, New York, NY 10032, United States; Department of Psychiatry, New York State Psychiatric Institute, New York, NY 10032, United States
| | - N C Barbarich-Marsteller
- Department of Psychiatry, College of Physicians and Surgeons of Columbia University, New York, NY 10032, United States; Department of Psychiatry, New York State Psychiatric Institute, New York, NY 10032, United States
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24
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Divergent functional effects of sazetidine-a and varenicline during nicotine withdrawal. Neuropsychopharmacology 2013; 38:2035-47. [PMID: 23624742 PMCID: PMC3746688 DOI: 10.1038/npp.2013.105] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Revised: 04/03/2013] [Accepted: 04/20/2013] [Indexed: 01/15/2023]
Abstract
Smoking is the largest preventable cause of death in the United States. Furthermore, a recent study found that <10% of quit attempts resulted in continuous abstinence for 1 year. With the introduction of pharmacotherapies like Chantix (varenicline), a selective α4β2 nicotinic partial agonist, successful quit attempts have significantly increased. Therefore, novel subtype-specific nicotinic drugs, such as sazetidine-A, present a rich area for investigation of therapeutic potential in smoking cessation. The present studies examine the anxiety-related behavioral and functional effects of the nicotinic partial agonists varenicline and sazetidine-A during withdrawal from chronic nicotine in mice. Our studies indicate that ventral hippocampal-specific infusions of sazetidine-A, but not varenicline, are efficacious in reducing nicotine withdrawal-related anxiety-like phenotypes in the novelty-induced hypophagia (NIH) paradigm. To further investigate functional differences between these partial agonists, we utilized voltage-sensitive dye imaging (VSDi) in ventral hippocampal slices to determine the effects of sazetidine-A and varenicline in animals chronically treated with saline, nicotine, or undergoing 24 h withdrawal. These studies demonstrate a functional dissociation of varenicline and sazetidine-A on hippocampal network activity, which is directly related to previous drug exposure. Furthermore, the effects of the nicotinic partial agonists in VSDi assays are significantly correlated with their behavioral effects in the NIH test. These findings highlight the importance of drug history in understanding the mechanisms through which nicotinic compounds may be aiding smoking cessation in individuals experiencing withdrawal-associated anxiety.
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25
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Fuss J, Vogt MA, Weber KJ, Burke TF, Gass P, Hensler JG. Hippocampal serotonin-1A receptor function in a mouse model of anxiety induced by long-term voluntary wheel running. Synapse 2013; 67:648-55. [PMID: 23505009 DOI: 10.1002/syn.21666] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Accepted: 03/09/2013] [Indexed: 01/12/2023]
Abstract
We have recently demonstrated that, in C57/Bl6 mice, long-term voluntary wheel running is anxiogenic, and focal hippocampal irradiation prevents the increase in anxiety-like behaviors and neurobiological changes in the hippocampus induced by wheel running. Evidence supports a role of hippocampal 5-HT1A receptors in anxiety. Therefore, we investigated hippocampal binding and function of 5-HT1A receptors in this mouse model of anxiety. Four weeks of voluntary wheel running resulted in hippocampal subregion-specific changes in 5-HT1A receptor binding sites and function, as measured by autoradiography of [(3) H] 8-hydroxy-2-(di-n-propylamino)tetralin binding and agonist-stimulated binding of [(35) S]GTPγS to G proteins, respectively. In the dorsal CA1 region, 5-HT1A receptor binding and function were not altered by wheel running or irradiation. In the dorsal dentate gyrus and CA2/3 region, 5-HT1A receptor function was decreased by not only running but also irradiation. In the ventral pyramidal layer, wheel running resulted in a decrease of 5-HT1A receptor function, which was prevented by irradiation. Neither irradiation nor wheel running affected 5-HT1A receptors in medial prefrontal cortex or in the dorsal or median raphe nuclei. Our data indicate that downregulation of 5-HT1A receptor function in ventral pyramidal layer may play a role in anxiety-like behavior induced by wheel running.
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Affiliation(s)
- Johannes Fuss
- RG Animal Models in Psychiatry, Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J 5, 68159 Mannheim, Germany
| | - Miriam A Vogt
- RG Animal Models in Psychiatry, Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J 5, 68159 Mannheim, Germany
| | - Klaus-Josef Weber
- Department of Radiooncology, Medical Faculty Heidelberg, Heidelberg University, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
| | - Teresa F Burke
- Department of Pharmacology, University of Texas Health Science Center-San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, United States
| | - Peter Gass
- RG Animal Models in Psychiatry, Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, Heidelberg University, J 5, 68159 Mannheim, Germany
| | - Julie G Hensler
- Department of Pharmacology, University of Texas Health Science Center-San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, United States
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26
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Pang TY, Renoir T, Du X, Lawrence AJ, Hannan AJ. Depression-related behaviours displayed by female C57BL/6J mice during abstinence from chronic ethanol consumption are rescued by wheel-running. Eur J Neurosci 2013; 37:1803-10. [PMID: 23551162 DOI: 10.1111/ejn.12195] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Revised: 01/31/2013] [Accepted: 02/19/2013] [Indexed: 12/22/2022]
Abstract
Withdrawal from a chronic period of alcohol consumption is commonly associated with the manifestation of depression, potentially exerting a significant influence on treatment prospects and increasing the likelihood of relapse. Better therapeutic strategies need to be developed to assist with rehabilitation. Here, we report the detection of depression-related behaviours in a mouse model of 6-week free-choice ethanol (10%, v/v) consumption followed by 2-week abstinence. Mice abstinent from alcohol showed increased immobility time on the forced-swim test, reduced saccharin consumption and increased latency to feed in the novelty-suppressed feeding test. By comparison, there was no significant effect on anxiety-related behaviours as determined by testing on the light-dark box and elevated plus maze. We found that the provision of running-wheels through the duration of abstinence attenuated depressive behaviour in the forced-swim and novelty-suppressed feeding tests, and increased saccharin consumption. Given the link between withdrawal from addictive substances and depression, this model will be useful for the study of the pathophysiology underlying alcohol-related depression. The findings of this study establish an interaction between physical activity and the development of behavioural changes following cessation of alcohol consumption that could have implications for the development of rehabilitative therapies.
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Affiliation(s)
- Terence Y Pang
- Behavioural Neurosciences Division, Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Vic., Australia.
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