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Dai Q, Kyuragi Y, Zakia H, Oishi N, Yao L, Zhang Z, Wang L, Yang J, Murai T, Fujiwara H. Psychological resilience is positively correlated with Habenula volume. J Affect Disord 2024:S0165-0327(24)01226-6. [PMID: 39151760 DOI: 10.1016/j.jad.2024.08.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2024] [Revised: 07/02/2024] [Accepted: 08/09/2024] [Indexed: 08/19/2024]
Abstract
BACKGROUND Psychological resilience is defined as the process and outcome of individuals' successful adaptation to challenging life experiences. The Habenula (Hb) is known to be involved in the stress response; however, the relationship between Hb volume and resilience in humans remains unclear. This study investigated the correlation among resilience, Hb volume, and depressive tendencies in adults. METHODS Hb volumes were assessed using deep learning techniques applied to 110 healthy participants. Resilience and depression were evaluated using the Connor-Davidson Resilience Scale and Beck Depression Inventory-II, respectively. We examined the relationship between Hb volume and resilience and assessed the mediating effects of resilience on the relationship between Hb volume and depressive tendencies. RESULTS Correlation analysis revealed a positive correlation between resilience and Hb volume (partial r = 0.176, p = 0.001), which was more pronounced in women (partial r = 0.353, p = 0.003). Hb volumes on the left and right sides exhibited significant lateralization (LI = 0.031, 95 % CI = [0.016, 0.046]). Despite Hb asymmetry, lateralization was not significantly associated with resilience. The mediation analysis shows significant indirect effect of resilience on the relationship between Hb volume and depressive tendencies (β = -0.093, 95%CI = [-0.189, -0.019]). CONCLUSION This study found that populations with lower resilience have smaller Hb volume. Previous research has shown that Hb volume decreased with the increasing severity of depression symptoms in patients. Our findings support this view and extend it to a population that has not been clinically diagnosed with depression. Additionally, we found that psychological resilience can be predicted by Hb volume and may serve as a mediating factor indirectly affecting depressive tendencies, even in healthy individuals. LIMITATIONS Due to its cross-sectional design, this study was unable to analyze dynamic changes in Hb volume during the process of resilience adaptation.
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Affiliation(s)
- Qi Dai
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan
| | - Yusuke Kyuragi
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan
| | - Halwa Zakia
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan
| | - Naoya Oishi
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan
| | - Lichang Yao
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan
| | - Zhilin Zhang
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan; Research Center for Medical Artificial Intelligence, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China
| | - Luyao Wang
- School of Life Science, Shanghai University, Shanghai, China
| | - Jiajia Yang
- Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University, Japan
| | - Toshiya Murai
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan
| | - Hironobu Fujiwara
- Department of Neuropsychiatry, Graduate School of Medicine, University of Kyoto, Kyoto, Japan; Artificial Intelligence Ethics and Society Team, RIKEN Center for Advanced Intelligence Project, Saitama, Japan; The General Research Division, Osaka University Research Center on Ethical, Legal and Social Issues, Kyoto, Japan.
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van Setten GB. Ocular Surface Allostasis-When Homeostasis Is Lost: Challenging Coping Potential, Stress Tolerance, and Resilience. Biomolecules 2023; 13:1246. [PMID: 37627311 PMCID: PMC10452761 DOI: 10.3390/biom13081246] [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: 04/05/2023] [Revised: 07/20/2023] [Accepted: 07/27/2023] [Indexed: 08/27/2023] Open
Abstract
The loss of ocular surface (OS) homeostasis characterizes the onset of dry eye disease. Resilience defines the ability to withstand this threat, reflecting the ability of the ocular surface to cope with and bounce back after challenging events. The coping capacity of the OS defines the ability to successfully manage cellular stress. Cellular stress, which is central to the outcome of the pathophysiology of dry eye disease, is characterized by intensity, continuity, and receptivity, which lead to the loss of homeostasis, resulting in a phase of autocatalytic dysregulation, an event that is not well-defined. To better define this event, here, we present a model providing a potential approach when homeostasis is challenged and the coping capacities have reached their limits, resulting in the stage of heterostasis, in which the dysregulated cellular stress mechanisms take over, leading to dry eye disease. The main feature of the proposed model is the concept that, prior to the initiation of the events leading to cellular stress, there is a period of intense activation of all available coping mechanisms preventing the imminent dysregulation of ocular surface homeostasis. When the remaining coping mechanisms and resilience potential have been maximally exploited and have, finally, been exceeded, there will be a transition to manifest disease with all the well-known signs and symptoms, with a shift to allostasis, reflecting the establishment of another state of balance. The intention of this review was to show that it is possibly the phase of heterostasis preceding the establishment of allostasis that offers a better chance for therapeutic intervention and optimized recovery. Once allostasis has been established, as a new steady-state of balance at a higher level of constant cell stress and inflammation, treatment may be far more difficult, and the potential for reversal is drastically decreased. Homeostasis, once lost, can possibly not be fully recovered. The processes established during heterostasis and allostasis require different approaches and treatments for their control, indicating that the current treatment options for homeostasis need to be adapted to a more-demanding situation. The loss of homeostasis necessarily implies the establishment of a new balance; here, we refer to such a state as allostasis.
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Affiliation(s)
- Gysbert-Botho van Setten
- St. Eriks Eye Hospital, 171 04 Solna, Sweden;
- Lab of DOHF and Wound Healing, Division of Eye and Vision, Department of Clinical Neuroscience, Karolinska Institutet, Eugeniavägen 12/Level 6, 171 04 Solna, Sweden
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Investigating Deep Brain Stimulation of the Habenula: A Review of Clinical Studies. Neuromodulation 2023; 26:292-301. [PMID: 35840520 DOI: 10.1016/j.neurom.2022.05.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 05/19/2022] [Indexed: 02/07/2023]
Abstract
OBJECTIVES The aim of this study was to examine the current scientific literature on deep brain stimulation (DBS) targeting the habenula for the treatment of neuropsychiatric disorders including schizophrenia, major depressive disorder, and obsessive-compulsive disorder (OCD). MATERIALS AND METHODS Two authors performed independent data base searches using the PubMed, Cochrane, PsycINFO, and Web of Science search engines. The data bases were searched for the query ("deep brain stimulation" and "habenula"). The inclusion criteria involved screening for human clinical trials written in English and published from 2007 to 2020. From the eligible studies, data were collected on the mean age, sex, number of patients included, and disorder treated. Patient outcomes of each study were summarized. RESULTS The search yielded six studies, which included 11 patients in the final analysis. Treated conditions included refractory depression, bipolar disorder, OCD, schizophrenia, and major depressive disorder. Patients with bipolar disorder unmedicated for at least two months had smaller habenula volumes than healthy controls. High-frequency stimulation of the lateral habenula attenuated the rise of serotonin in the dorsal raphe nucleus for treating depression. Bilateral habenula DBS and patient OCD symptoms were reduced and maintained at one-year follow up. Low- and high-frequency stimulation DBS can simulate input paths to the lateral habenula to treat addiction, including cocaine addiction. More data are needed to draw conclusions as to the impact of DBS for schizophrenia and obesity. CONCLUSIONS The habenula is a novel target that could aid in reducing neuropsychiatric symptoms and should be considered in circuit-specific investigation of neuromodulation for psychiatric disorders. More information needs to be gathered and assessed before this treatment is fully approved for treatment of neuropsychiatric conditions.
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Left-right asymmetric and smaller right habenula volume in major depressive disorder on high-resolution 7-T magnetic resonance imaging. PLoS One 2021; 16:e0255459. [PMID: 34343199 PMCID: PMC8330903 DOI: 10.1371/journal.pone.0255459] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 07/18/2021] [Indexed: 02/08/2023] Open
Abstract
The habenula (Hb) has been hypothesized to play an essential role in major depressive disorder (MDD) as it is considered to be an important node between fronto-limbic areas and midbrain monoaminergic structures based on animal studies. In this study, we aimed to investigate the differences in volume and T1 value of the Hb between patients with MDD and healthy control (HC) subjects. Analysis for the Hb volumes was performed using high-resolution 7-T magnetic resonance (MR) image data from 33 MDD patients and 36 healthy subjects. Two researchers blinded to the clinical data manually delineated the habenular nuclei and Hb volume, and T1 values were calculated based on overlapping voxels. We compared the Hb volume and T1 value between the MDD and HC groups and compared the volume and T1 values between the left and right Hbs in each group. Compared to HC subjects, MDD patients had a smaller right Hb volume; however, there was no significant volume difference in the left Hb between groups. In the MDD group, the right Hb was smaller in volume and lower in T1 value than the left Hb. The present findings suggest a smaller right Hb volume and left-right asymmetry of Hb volume in MDD. Future high-resolution 7-T MR imaging studies with larger sample sizes will be needed to derive a more definitive conclusion.
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Macro- and Microscale Stress-Associated Alterations in Brain Structure: Translational Link With Depression. Biol Psychiatry 2021; 90:118-127. [PMID: 34001371 DOI: 10.1016/j.biopsych.2021.04.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 02/06/2023]
Abstract
Major depressive disorder (MDD) is a stress-related disorder associated with many cytoarchitectural and neurochemical changes. However, the majority of these changes cannot be reliably detected in the living brain. The examination of animal stress models and postmortem human brain tissue has significantly contributed to our understanding of the pathophysiology of MDD. Ronald Duman's work in humans and in rodent models was critical to the investigation of the contribution of synaptic deficits to MDD and chronic stress pathology, their role in the development and expression of depressive-like behavior, and reversal by novel drugs. Here, we review evidence from magnetic resonance imaging in humans and animals that suggests that corticolimbic alterations are associated with depression symptomatology. We also discuss evidence of cytoarchitectural alterations affecting neurons, astroglia, and synapses in MDD and highlight how similar changes are described in rodent chronic stress models and are linked to the emotion-related behavioral deficits. Finally, we report on the latest approaches developed to measure the synaptic and astroglial alterations in vivo, using positron emission tomography, and how it can inform on the contribution of MDD-associated cytoarchitectural alterations to the symptomatology and the treatment of stress-related disorders.
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PPM1F in hippocampal dentate gyrus regulates the depression-related behaviors by modulating neuronal excitability. Exp Neurol 2021; 340:113657. [PMID: 33639208 DOI: 10.1016/j.expneurol.2021.113657] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 12/28/2020] [Accepted: 02/21/2021] [Indexed: 01/21/2023]
Abstract
Major depressive disorder (MDD) is a common, serious, debilitating mental illness. Protein phosphatase Mg2+/Mn2+-dependent 1F (PPM1F), a serine/threonine phosphatase, has been reported to have multiple biological and cellular functions. However, the effects of PPM1F and its neuronal substrates on depressive behaviors remain largely unknown. Here, we showed that PPM1F is widely distributed in the hippocampus, and chronic unpredictable stress (CUS) can induce increased expression of PPM1F in the hippocampus, which was correlated with depression-associated behaviors. Overexpression of PPM1F mediated by adeno-associated virus (AAV) in the dentate gyrus (DG) produced depression-related behaviors and enhanced susceptibility to subthreshold CUS (SCUS) in both male and female mice, while, knockout of PPM1F in DG produced antidepressant phonotypes under stress conditions. Whole-cell patch-clamp recordings demonstrated that overexpression of PPM1F increased the neuronal excitability of the granule cells in the DG. Consistent with neuronal hyperexcitability, overexpression of PPM1F regulated the expression of certain ion channel genes and induced decreased phosphorylation of Ca2+/calmodulin-dependent protein kinase II (CAMKII) and Adenosine 5'-monophosphate (AMP)-activated protein kinase (AMPK) in hippocampus. These results suggest that PPM1F in the DG regulates depression-related behaviors by modulating neuronal excitability, which might be an important pathological gene for depression or other mental diseases.
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Zhang FH, Wang ZM, Liu YT, Huang JS, Liang S, Wu HH, Xu YT. Bioactivities of serotonin transporter mediate antidepressant effects of Acorus tatarinowii Schott. JOURNAL OF ETHNOPHARMACOLOGY 2019; 241:111967. [PMID: 31128148 DOI: 10.1016/j.jep.2019.111967] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 04/11/2019] [Accepted: 05/20/2019] [Indexed: 06/09/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Acrorus tatarinowii Schott has been widely used in the treatments of neuropsychiatric and digestive disorders in clinical practices of traditional Chinese medicine for thousands of years. Both clinical and preclinical studies demonstrated antidepressant effects of A. tatarinowii. However, the possible action mechanisms of antidepressant effects of A. tatarinowii remain unraveled. AIM OF THE STUDY The present study aimed to investigate the roles of serotonin transporter (SERT) in antidepressant effects of A. tatarinowii. MATERIALS AND METHODS Antidepressant effects of water extract of A. tatarinowii were evaluated by forced swimming test (FST), tail suspension test (TST) and locomotor activity test. The water extract was analyzed by ultra high performance liquid chromatography (UPLC) method. Two major fractions of A. tatarinowii, petroleum ether extract and water extract after petroleum ether processed, were prepared and analyzed by UPLC method. Further, volatile oil extracted by ether extraction, solid phase micro-extraction (SPME) and hydro-distillation were compared and analyzed by gas chromatography-mass spectrometer (GC-MS) method. Finally, major constituents of water extract of A. tatarinowii were isolated by preparative high performance liquid chromatography (HPLC) and identified by extensive spectroscopic analyses. Effects of all of the above mentioned samples on SERT activity were tested by a high content assay (HCA). RESULTS Results of FST, TST and locomotor activity confirmed that water extract of A. tatarinowii significantly decreased mice immobility time but did not change mice locomotor activity. UPLC analysis results revealed that the water extract contained trace amount of β-asarone (0.0004206%) and α-asarone (0.0001918%). HCA results demonstrated that the water extract significantly enhanced SERT activity at 100 μg/mL. Further, GC-MS and UPLC analyses revealed that petroleum ether extract contained high content of β-asarone (45.63%) and α-asarone (12.50%). GC-MS analysis results demonstrated that the volatile oil extracted by ether extraction, SPME and hydro-distillation contained similar major components. HCA results verified that the petroleum ether extract significantly enhanced SERT activity at 1.56 μg/mL. Moreover, UPLC analysis of water extract after petroleum ether processed did not show any characteristic peaks. HCA results demonstrated that this extract significantly inhibited SERT activity at 50-100 μg/mL. Finally, phytochemistry investigation on the water extract of A. tatarinowii afforded seven constituents including veratric acid (9), anisic acid (7), 3,4,5-trimethoxybenzoic acid (3), trans-isoferulic acid (2), 2,4,5-trimethoxybenzoic acid (11), 4-hydroxybenzoic acid (6) and syringic acid (13). Their structures were established on the basis of nuclear magnetic resonance (NMR) and mass spectrometer (MS) data and comparative UPLC analyses. HCA results demonstrated the major components of the water extract of A. tatarinowii demonstrated SERT enhancement/inhibition activities. CONCLUSIONS This study first systematically demonstrated the roles of SERT activity in antidepressant effects of A. tatarinowii, including water extract, major fractions and main constituents. These results revealed that A. tatarinowii could regulate SERT activities in bidirectional ways.
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Affiliation(s)
- Feng-Hong Zhang
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China
| | - Zhi-Mei Wang
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China
| | - Yan-Ting Liu
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China
| | - Ji-Sheng Huang
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China
| | - Shuang Liang
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China
| | - Hong-Hua Wu
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China.
| | - Yan-Tong Xu
- Tianjin State Key Laboratory of Modern Chinese Medicine, Tianjin Key Laboratory of Chemistry and Analysis of Traditional Chinese Medicine, Institute of Traditional Chinese Medicine, Tianjin University of Traditional Chinese Medicine, 10 Poyanghu Road, West Area, Tuanbo New Town, Jinghai District, Tianjin 301617, People's Republic of China.
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Kauer-Sant'Anna M, Frey BN, Fijtman A, Loredo-Souza AC, Dargél AA, Pfaffenseller B, Wollenhaupt-Aguiar B, Gazalle FK, Colpo GD, Passos IC, Bücker J, Walz JC, Jansen K, Ceresér M, Bürke Bridi KP, Dos Santos Sória L, Kunz M, Pinho M, Kapczinski NS, Goi PD, Magalhães PV, Reckziegel R, Burque RK, de Azevedo Cardoso T, Kapczinski F. Adjunctive tianeptine treatment for bipolar disorder: A 24-week randomized, placebo-controlled, maintenance trial. J Psychopharmacol 2019; 33:502-510. [PMID: 30835152 DOI: 10.1177/0269881119826602] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE The purpose of this study was to assess the efficacy and tolerability of tianeptine as an adjunctive maintenance treatment for bipolar depression. METHODS This is a multicenter double-blind randomized placebo-controlled maintenance trial of adjunctive tianeptine 37.5 mg/day. Participants ( n=161) had a Montgomery-Asberg Depression Rating Scale ⩾12 at entry. After eight weeks of open-label tianeptine treatment, those who responded to tianeptine ( n=69) were randomized to adjunctive tianeptine ( n=36) or placebo ( n=33) in addition to usual treatment. Kaplan-Meier estimates and the Mantel-Cox log-rank test were used to evaluate differences in time to intervention for a mood episode between the tianeptine and placebo groups. We also assessed overall functioning, biological rhythms, quality of life, rates of manic switch and serum brain-derived neurotrophic factor levels. RESULTS There were no differences between adjunctive tianeptine or placebo regarding time to intervention or depression scores in the 24-week double-blind controlled phase. Patients in the tianeptine group showed better performance in the letter-number sequencing subtest from the Wechsler Adult Intelligence Scale at the endpoint ( p=0.014). Tianeptine was well tolerated and not associated with higher risk for manic switch compared to placebo. CONCLUSION Tianeptine was not more effective than placebo in the maintenance treatment of bipolar depression. There is preliminary evidence suggesting a pro-cognitive effect of tianeptine in working memory compared to placebo.
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Affiliation(s)
- Márcia Kauer-Sant'Anna
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Benicio N Frey
- 3 Women's Health Concerns Clinic, St Joseph's Healthcare, Hamilton, ON, Canada.,4 Mood Disorders Program, Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada
| | - Adam Fijtman
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Ana C Loredo-Souza
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Aroldo A Dargél
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Bianca Pfaffenseller
- 4 Mood Disorders Program, Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada
| | - Bianca Wollenhaupt-Aguiar
- 4 Mood Disorders Program, Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada
| | - Fernando K Gazalle
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Gabriela D Colpo
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Ives C Passos
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Joana Bücker
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Júlio C Walz
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Karen Jansen
- 6 Department of Health and Behavior, Catholic University of Pelotas, Pelotas, Brazil
| | - Mendes Ceresér
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Kelen P Bürke Bridi
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Lisiane Dos Santos Sória
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Maurício Kunz
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Michele Pinho
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Natália S Kapczinski
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Pedro D Goi
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,5 Department of Internal Medicine, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Porto Alegre, Brazil
| | - Pedro Vs Magalhães
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Ramiro Reckziegel
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Renan K Burque
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Taiane de Azevedo Cardoso
- 4 Mood Disorders Program, Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada
| | - Flávio Kapczinski
- 1 Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,2 Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.,4 Mood Disorders Program, Department of Psychiatry and Behavioural Neurosciences, McMaster University, Hamilton, ON, Canada
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Abstract
Stress hyperglycemia has gained the attention of virtually every physician who encounters critically ill patients, with the emergence of clinical data supporting tight glycemic control and intensive insulinization for optimal outcome. In order to effectively manage stress hyperglycemia, newer theories of critical illness and the interactions of the brain, neuroendocrine axis, and immune system need to be explored. Nonlinear physiologic processes, glucose allostasis, immune-neuroendocrine axis activation, and molecular mechanisms of insulin receptor signal transduction contribute to a novel model of stress hyperglycemia. In chronic critical illness, allostatic overload leads to a plurality of organ-system derangements and eventually death. Intervention not only involves insulinization according to neurofuzzy logic but also targeting more proximate events with cognitive/behavioral therapy and hypothalamic releasing factors.
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Affiliation(s)
- Jeffrey I Mechanick
- Division of Endocrinology, Diabetes and Bone Diseases, Mount Sinai School of Medicine, 1192 Park Avenue, New York, NY 10128, USA.
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10
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Savitz J, Morris HM, Drevets WC. Neuroimaging Studies of Bipolar Depression: Therapeutic Implications. BIPOLAR DEPRESSION: MOLECULAR NEUROBIOLOGY, CLINICAL DIAGNOSIS, AND PHARMACOTHERAPY 2016. [DOI: 10.1007/978-3-319-31689-5_8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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11
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Amrein I. Adult hippocampal neurogenesis in natural populations of mammals. Cold Spring Harb Perspect Biol 2015; 7:7/5/a021295. [PMID: 25934014 DOI: 10.1101/cshperspect.a021295] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This review will discuss adult hippocampal neurogenesis in wild mammals of different taxa and outline similarities with and differences from laboratory animals. It begins with a review of evidence for hippocampal neurogenesis in various mammals, and shows the similar patterns of age-dependent decline in cell proliferation in wild and domesticated mammals. In contrast, the pool of immature neurons that originate from proliferative activity varies between species, implying a selective advantage for mammals that can make use of a large number of these functionally special neurons. Furthermore, rapid adaptation of hippocampal neurogenesis to experimental challenges appears to be a characteristic of laboratory rodents. Wild mammals show species-specific, rather stable hippocampal neurogenesis, which appears related to demands that characterize the niche exploited by a species rather than to acute events in the life of its members. Studies that investigate adult neurogenesis in wild mammals are not numerous, but the findings of neurogenesis under natural conditions can provide new insights, and thereby also address the question to which cognitive demands neurogenesis may respond during selection.
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Affiliation(s)
- Irmgard Amrein
- Institute of Anatomy, University of Zürich-Irchel, CH-8057 Zürich, Switzerland
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Podestá MF, Yam P, Codagnone MG, Uccelli NA, Colman D, Reinés A. Distinctive PSA-NCAM and NCAM hallmarks in glutamate-induced dendritic atrophy and synaptic disassembly. PLoS One 2014; 9:e108921. [PMID: 25279838 PMCID: PMC4184824 DOI: 10.1371/journal.pone.0108921] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Accepted: 09/05/2014] [Indexed: 12/13/2022] Open
Abstract
Dendritic and synapse remodeling are forms of structural plasticity that play a critical role in normal hippocampal function. Neural cell adhesion molecule (NCAM) and its polysialylated form (PSA-NCAM) participate in neurite outgrowth and synapse formation and plasticity. However, it remains unclear whether they contribute to dendritic retraction and synaptic disassembly. Cultured hippocampal neurons exposed to glutamate (5 µM) showed a reduced MAP-2 (+) area in the absence of neuronal death 24 h after the insult. Concomitantly, synapse loss, revealed by decreased synaptophysin and post-synaptic density-95 cluster number and area, together with changes in NCAM and PSA-NCAM levels were found. Dendritic atrophy and PSA-NCAM reduction proved NMDA-receptor dependent. Live-imaging experiments evidenced dendritic atrophy 4 h after the insult; this effect was preceded by smaller NCAM clusters (1 h) and decreased surface and total PSA-NCAM levels (3 h). Simultaneously, total NCAM cluster number and area remained unchanged. The subsequent synapse disassembly (6 h) was accompanied by reductions in total NCAM cluster number and area. A PSA mimetic peptide prevented both the dendritic atrophy and the subsequent synaptic changes (6 h) but had no effect on the earliest synaptic remodeling (3 h). Thus, NCAM-synaptic reorganization and PSA-NCAM level decrease precede glutamate-induced dendritic atrophy, whereas the NCAM level reduction is a delayed event related to synapse loss. Consequently, distinctive stages in PSA-NCAM/NCAM balance seem to accompany glutamate-induced dendritic atrophy and synapse loss.
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Affiliation(s)
- María Fernanda Podestá
- Instituto de Investigaciones Farmacológicas (ININFA, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
- Cátedra de Farmacología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
- Instituto de Biología Celular y Neurociencias “Prof. E. De Robertis” (IBCN, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Patricia Yam
- Montreal Neurological Institute and Hospital, McGill University, Montreal, Canada
| | - Martín Gabriel Codagnone
- Instituto de Investigaciones Farmacológicas (ININFA, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
- Cátedra de Farmacología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
- Instituto de Biología Celular y Neurociencias “Prof. E. De Robertis” (IBCN, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - Nonthué Alejandra Uccelli
- Instituto de Investigaciones Farmacológicas (ININFA, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
- Cátedra de Farmacología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
- Instituto de Biología Celular y Neurociencias “Prof. E. De Robertis” (IBCN, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
| | - David Colman
- Montreal Neurological Institute and Hospital, McGill University, Montreal, Canada
| | - Analía Reinés
- Instituto de Investigaciones Farmacológicas (ININFA, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
- Cátedra de Farmacología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
- Instituto de Biología Celular y Neurociencias “Prof. E. De Robertis” (IBCN, CONICET-UBA), Ciudad Autónoma de Buenos Aires, Argentina
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Daskalakis NP, Yehuda R, Diamond DM. Animal models in translational studies of PTSD. Psychoneuroendocrinology 2013; 38:1895-911. [PMID: 23845512 DOI: 10.1016/j.psyneuen.2013.06.006] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 06/05/2013] [Accepted: 06/05/2013] [Indexed: 01/29/2023]
Abstract
Understanding the neurobiological mechanisms of post-traumatic stress disorder (PTSD) is of vital importance for developing biomarkers and more effective pharmacotherapy for this disorder. The design of bidirectional translational studies addressing all facets of PTSD is needed. Animal models of PTSD are needed not only to capture the complexity of PTSD behavioral characteristics, but also to address experimentally the influence of variety of factors which might determine an individual's vulnerability or resilience to trauma, e.g., genetic predisposition, early-life experience and social support. The current review covers recent translational approaches to bridge the gap between human and animal PTSD research and to create a framework for discovery of biomarkers and novel therapeutics.
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Affiliation(s)
- Nikolaos P Daskalakis
- Traumatic Stress Studies Division & Laboratory of Molecular Neuropsychiatry, Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, USA; Mental Health Care Center, PTSD Clinical Research Program & Laboratory of Clinical Neuroendocrinology and Neurochemistry, James J. Peters Veterans Affairs Medical Center, Bronx, USA
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Zoladz PR, Fleshner M, Diamond DM. Differential effectiveness of tianeptine, clonidine and amitriptyline in blocking traumatic memory expression, anxiety and hypertension in an animal model of PTSD. Prog Neuropsychopharmacol Biol Psychiatry 2013; 44:1-16. [PMID: 23318688 DOI: 10.1016/j.pnpbp.2013.01.001] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 12/22/2012] [Accepted: 01/04/2013] [Indexed: 12/21/2022]
Abstract
Individuals exposed to life-threatening trauma are at risk for developing post-traumatic stress disorder (PTSD), a debilitating condition that involves persistent anxiety, intrusive memories and several physiological disturbances. Current pharmacotherapies for PTSD manage only a subset of these symptoms and typically have adverse side effects which limit their overall effectiveness. We evaluated the effectiveness of three different pharmacological agents to ameliorate a broad range of PTSD-like symptoms in our established predator-based animal model of PTSD. Adult male Sprague-Dawley rats were given 1-h cat exposures on two occasions that were separated by 10 days, in conjunction with chronic social instability. Beginning 24 h after the first cat exposure, rats received daily injections of amitriptyline, clonidine, tianeptine or vehicle. Three weeks after the second cat exposure, all rats underwent a battery of behavioral and physiological tests. The vehicle-treated, psychosocially stressed rats demonstrated a robust fear memory for the two cat exposures, as well as increased anxiety expressed on the elevated plus maze, an exaggerated startle response, elevated heart rate and blood pressure, reduced growth rate and increased adrenal gland weight, relative to the vehicle-treated, non-stressed (control) rats. Neither amitriptyline nor clonidine was effective at blocking the entire cluster of stress-induced sequelae, and each agent produced adverse side effects in control subjects. Only the antidepressant tianeptine completely blocked the effects of psychosocial stress on all of the physiological and behavioral measures that were examined. These findings illustrate the differential effectiveness of these three treatments to block components of PTSD-like symptoms in rats, and in particular, reveal the profile of tianeptine as the most effective of all three agents.
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Affiliation(s)
- Phillip R Zoladz
- Department of Psychology, Sociology & Criminal Justice, Ohio Northern University, Ada, OH, USA
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15
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Lanfumey L, Mongeau R, Hamon M. Biological rhythms and melatonin in mood disorders and their treatments. Pharmacol Ther 2013; 138:176-84. [DOI: 10.1016/j.pharmthera.2013.01.005] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 12/21/2012] [Indexed: 12/15/2022]
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16
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Tanti A, Belzung C. Hippocampal neurogenesis: a biomarker for depression or antidepressant effects? Methodological considerations and perspectives for future research. Cell Tissue Res 2013; 354:203-19. [PMID: 23595256 DOI: 10.1007/s00441-013-1612-z] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Accepted: 03/08/2013] [Indexed: 12/22/2022]
Abstract
Whereas animal models of depression are associated with decreased adult hippocampal neurogenesis, antidepressant treatments, including pharmacotherapy but also electroconvulsive therapy, have the opposite action, as they stimulate cell proliferation and the survival and maturation of newborn dentate gyrus neurons. Although the lack of these new cells is not causally involved in depression, as their absence does not trigger a depressive-episode per se, their loss has been shown to be causally involved in the ability of chronic monoaminergic antidepressants to achieve remission. However, the process by which the stimulation of hippocampal neurogenesis can elicit recovery after a depressive-like episode is poorly understood. The accepted view is that hippocampal newborn neurons integrate into the hippocampal network and thus participate in hippocampal cognitive functions crucial for remission. The hippocampus is associated with a wide range of such functions, including spatial navigation, pattern separation, encoding of new contextual information, emotional behavior and control over the hypothalamic-pituitary-adrenal axis. The present review aims at discussing each of these functions and tries to identify the process by which newborn cells participate in remission after successful therapy. Finally, future directions are proposed for a better understanding of these mechanisms.
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Affiliation(s)
- Arnaud Tanti
- UFR Sciences et Techniques, Université François Rabelais & INSERM 930, Parc Grandmont, 37200, Tours, France,
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17
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Schloesser RJ, Jimenez DV, Hardy NF, Paredes D, Catlow BJ, Manji HK, McKay RD, Martinowich K. Atrophy of pyramidal neurons and increased stress-induced glutamate levels in CA3 following chronic suppression of adult neurogenesis. Brain Struct Funct 2013; 219:1139-48. [PMID: 23483239 DOI: 10.1007/s00429-013-0532-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Accepted: 02/21/2013] [Indexed: 01/12/2023]
Abstract
Following their birth in the adult hippocampal dentate gyrus, newborn progenitor cells migrate into the granule cell layer where they differentiate, mature, and functionally integrate into existing circuitry. The hypothesis that adult hippocampal neurogenesis is physiologically important has gained traction, but the precise role of newborn neurons in hippocampal function remains unclear. We investigated whether loss of new neurons impacts dendrite morphology and glutamate levels in area CA3 of the hippocampus by utilizing a human GFAP promoter-driven thymidine kinase genetic mouse model to conditionally suppress adult neurogenesis. We found that chronic ablation of new neurons induces remodeling in CA3 pyramidal cells and increases stress-induced release of the neurotransmitter glutamate. The ability of persistent impairment of adult neurogenesis to influence hippocampal dendrite morphology and excitatory amino acid neurotransmission has important implications for elucidating newborn neuron function, and in particular, understanding the role of these cells in stress-related excitoxicity.
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Affiliation(s)
- Robert J Schloesser
- Mood and Anxiety Disorders Program, National Institute of Mental Health (NIMH), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
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18
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Social defeat induces changes in histone acetylation and expression of histone modifying enzymes in the ventral hippocampus, prefrontal cortex, and dorsal raphe nucleus. Neuroscience 2013; 264:88-98. [PMID: 23370319 DOI: 10.1016/j.neuroscience.2013.01.024] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Revised: 01/09/2013] [Accepted: 01/14/2013] [Indexed: 12/12/2022]
Abstract
Chronic exposure to stress is associated with a number of psychiatric disorders, but little is known about the epigenetic mechanisms that underlie the stress response or resilience to chronic stress. We investigated histone acetylation in seven different brain regions of rats exposed to chronic social defeat stress: the dorsal hippocampus (dHPC), ventral hippocampus (vHPC), medial prefrontal cortex (mPFC), basolateral amygdala (BLA), locus coeruleus (LC), paraventricular thalamus (PVT), and dorsal raphe (DR) nucleus. This stress paradigm was unique in that it allowed rats to display resilience in the form of an active coping mechanism. We found that there was an increase in acetylation of H3K9/14 (H3K9/14ac) and bulk acetylation of H4K5,8,12,16 (H4K5,8,12,16ac) in the DR nucleus of rats that were less resilient. Less resilient rats also displayed increased levels of H3K18 acetylation (H3K18ac) in the mPFC when compared to non-stressed controls. In the vHPC, there was an increase in H3K18ac and H4K12 (H4K12ac) in rats that were less resilient when compared to non-stressed control rats. In addition, there was a decrease in levels of H4K8 acetylation (H4K8ac) in both resilient and non-resilient rats as compared to controls. We assessed expression of histone modifying enzymes in the vHPC and the mPFC using quantitative real-time polymerase chain reaction (PCR) and found changes in expression of a number of targets. These included changes in Sirt1 and Sirt2 in the vHPC and changes in Kat5 in the mPFC. Overall, these results suggest that changes in histone acetylation and expression of histone modifying enzymes in these regions correlate with the behavioral response to stress in socially defeated rats.
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Bambico FR, Belzung C. Novel insights into depression and antidepressants: a synergy between synaptogenesis and neurogenesis? Curr Top Behav Neurosci 2013; 15:243-291. [PMID: 23271325 DOI: 10.1007/7854_2012_234] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Major depressive disorder has been associated with manifold pathophysiological changes. These include metabolic abnormalities in discreet brain areas; modifications in the level of stress hormones, neurotransmitters, and neurotrophic factors; impaired spinogenesis and synaptogenesis in crucial brain areas, such as the prefrontal cortex and the hippocampus; and impaired neurogenesis in the hippocampus. Antidepressant therapy facilitates remission by reversing most of these disturbances, indicating that these dysfunctions may participate causally in depressive symptomatology. However, few attempts have been made to integrate these different pathophysiologies into one model. The present chapter endeavors (1) to review the extant literature in the field, with particular focus on the role of neurogenesis and synaptogenesis in depression; (2) and to suggest a possible interplay between these two processes, as well as, describe the ways by which improving both neurogenesis and synaptogenesis may enable effective recovery by acting on a larger neuronal network.
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Affiliation(s)
- Francis Rodriguez Bambico
- Behavioural Neurobiology Laboratory, Research Neuroimaging Division, Center for Addiction and Mental Health, University of Toronto, 250 College Street, Toronto, ON, M5T 1R8, Canada,
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20
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Piroli GG, Reznikov LR, Grillo CA, Hagar JM, Fadel JR, Reagan LP. Tianeptine modulates amygdalar glutamate neurochemistry and synaptic proteins in rats subjected to repeated stress. Exp Neurol 2012; 241:184-93. [PMID: 23262120 DOI: 10.1016/j.expneurol.2012.12.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Revised: 11/20/2012] [Accepted: 12/06/2012] [Indexed: 11/25/2022]
Abstract
Stress is a common environmental factor associated with depressive illness and the amygdala is thought to be integral for this association. For example, repeated stress impairs amygdalar neuroplasticity in rodents and these defects parallel amygdalar deficits in depressive illness patients. Because the excitatory neurotransmitter glutamate is important in neuroplasticity, we hypothesized that alterations in amygdalar glutamatergic systems may serve as key players in depressive illness. Moreover, restoration of amygdalar glutamatergic systems may serve as important therapeutic targets in the successful management of multiple stress-related mood disorders. To address these hypotheses, we measured glutamate efflux in the basolateral and central amygdalar complexes via in vivo microdialysis, as well as the expression of synaptic proteins that regulate vesicular glutamate packaging and release, in rats subjected to repeated stress and treated daily with saline or the antidepressant tianeptine. Glutamate efflux was significantly reduced in the central amygdalar complex of animals subjected to repeated stress. In addition, repeated stress nearly eliminated amygdalar vGLUT2 expression, thereby proving a potential mechanism through which repeated stress impairs amygdalar glutamate neurochemistry. These stress-induced changes in glutamate efflux and vGLUT2 expression were inhibited by daily tianeptine administration. Moreover, tianeptine administration increased the vesicular localization of SNAP-25, which could account for the ability of tianeptine to modify glutamatergic tone in non-stressed control rats. Collectively, these results demonstrate that repeated stress differentially affects amygdalar glutamate systems and further supports our previous studies indicating that tianeptine's antidepressant efficacy may involve targeting amygdalar glutatamatergic systems.
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Affiliation(s)
- Gerardo G Piroli
- Department of Pharmacology, Physiology and Neuroscience, School of Medicine, University of South Carolina, 6439 Garners Ferry Rd, Columbia, SC 29208, USA
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The neurobiology of depression and antidepressant action. Neurosci Biobehav Rev 2012; 37:2331-71. [PMID: 23261405 DOI: 10.1016/j.neubiorev.2012.12.007] [Citation(s) in RCA: 320] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 11/26/2012] [Accepted: 12/10/2012] [Indexed: 12/18/2022]
Abstract
We present a comprehensive overview of the neurobiology of unipolar major depression and antidepressant drug action, integrating data from affective neuroscience, neuro- and psychopharmacology, neuroendocrinology, neuroanatomy, and molecular biology. We suggest that the problem of depression comprises three sub-problems: first episodes in people with low vulnerability ('simple' depressions), which are strongly stress-dependent; an increase in vulnerability and autonomy from stress that develops over episodes of depression (kindling); and factors that confer vulnerability to a first episode (a depressive diathesis). We describe key processes in the onset of a 'simple' depression and show that kindling and depressive diatheses reproduce many of the neurobiological features of depression. We also review the neurobiological mechanisms of antidepressant drug action, and show that resistance to antidepressant treatment is associated with genetic and other factors that are largely similar to those implicated in vulnerability to depression. We discuss the implications of these conclusions for the understanding and treatment of depression, and make some strategic recommendations for future research.
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The same antidepressant elicits contrasting patterns of synaptic changes in the amygdala vs hippocampus. Neuropsychopharmacology 2012; 37:2702-11. [PMID: 22828748 PMCID: PMC3473336 DOI: 10.1038/npp.2012.135] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
As depression-like symptoms are often precipitated by some form of stress, animal models of stress have been used extensively to investigate cellular mechanisms of depression. Despite being implicated in the emotional symptoms of depression, the amygdala has received little attention compared to the hippocampus in the past studies of antidepressant action. Further, these investigations have not taken into account the contrasting effects of chronic stress on the hippocampus vs amygdala. If an antidepressant is to be equally effective in countering the differential effects of stress on both brain areas, then it is faced with the challenge of eliciting contrasting effects in these two structures. We tested this prediction by examining the impact of tianeptine, an antidepressant with proven clinical efficacy, on neurons of the lateral amygdala (LA) and hippocampal area CA1. Tianeptine reduces N-methyl-D-aspartate (NMDA)-receptor-mediated synaptic currents, without affecting α-amino-3-hydroxy-5-methyl-4-isoxazole propionate (AMPA) currents, in LA neurons. By contrast, tianeptine enhances both NMDA and AMPA currents in area CA1. Tianeptine also lowers action potential firing in LA neurons. As tianeptine modulates cellular metrics that, in addition to mediating amygdalar behavioral output, are also affected by stress, we tested if tianeptine succeeds in countering stress effects in the intact animal. We find that tianeptine prevents two important functional consequences of chronic stress-induced plasticity in the amygdala--dendritic growth and enhanced anxiety-like behavior. These results provide evidence for antidepressant action on amygdalar neurons that are not only distinct from the hippocampus, but also protect against the debilitating impact of stress on amygdalar structure and function.
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Nollet M, Gaillard P, Tanti A, Girault V, Belzung C, Leman S. Neurogenesis-independent antidepressant-like effects on behavior and stress axis response of a dual orexin receptor antagonist in a rodent model of depression. Neuropsychopharmacology 2012; 37:2210-21. [PMID: 22713907 PMCID: PMC3422486 DOI: 10.1038/npp.2012.70] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Growing evidence indicates that an increase of orexin (or hypocretin) signaling is involved in the pathophysiology of major depression, but little is known regarding the causal link between the orexinergic system and depressive-like states. Here we blocked orexin receptors in mice subjected to unpredictable chronic mild stress (UCMS) to investigate putative antidepressant-like effects of this treatment, as well as the underlying mechanisms. BALB/c mice were exposed to 9 weeks of UCMS and from the third week onward treated daily with fluoxetine (20 mg/kg per day, per os) or with the dual orexin receptor antagonist almorexant (100 mg/kg per day, per os). The effects of UCMS regimen and pharmacological treatments were assessed by physical measures and behavioral testing. The dexamethasone suppression test was performed to examine the integrity of the negative feedback of the hypothalamic-pituitary-adrenal (HPA) axis, and immunohistochemical markers were used to assess cell proliferation (Ki-67), immature newborn neurons (doublecortin), and mature newborn neurons (5-bromo-2'-deoxyuridine/NeuN) in the dorsal and ventral parts of the hippocampus. Our results show that 7 weeks of fluoxetine or almorexant treatments counteract the UCMS-induced physical and behavioral alterations. Both treatments prevented the HPA axis dysregulation caused by UCMS, but only fluoxetine reversed the UCMS-induced decrease of hippocampal cell proliferation and neurogenesis, while chronic almorexant treatment decreased cell proliferation and neurogenesis specifically in the ventral hippocampus. Taken together, this is the first evidence that pharmacological blockade of the orexinergic system induces a robust antidepressant-like effect and the restoration of stress-related HPA axis defect independently from a neurogenic action.
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Affiliation(s)
- Mathieu Nollet
- Inserm U930—Imaging and Brain, Université François Rabelais, UFR Sciences et Techniques, Tours, France
| | - Philippe Gaillard
- Inserm U930—Imaging and Brain, Université François Rabelais, UFR Sciences et Techniques, Tours, France,Clinique Psychiatrique Universitaire, CHRU de Tours, Tours, France
| | - Arnaud Tanti
- Inserm U930—Imaging and Brain, Université François Rabelais, UFR Sciences et Techniques, Tours, France
| | - Virginie Girault
- Inserm U930—Imaging and Brain, Université François Rabelais, UFR Sciences et Techniques, Tours, France
| | - Catherine Belzung
- Inserm U930—Imaging and Brain, Université François Rabelais, UFR Sciences et Techniques, Tours, France
| | - Samuel Leman
- Inserm U930—Imaging and Brain, Université François Rabelais, UFR Sciences et Techniques, Tours, France,UMR Inserm 930—Imaging and Brain, Team 4: Affective Disorders, Université François Rabelais, UFR Sciences et Techniques, Parc Grandmont, 37200 Tours, France, Tel: +33 02 47 36 69 97, Fax: +33 02 47 36 72 85, E-mail:
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Tianeptine treatment induces antidepressive-like effects and alters BDNF and energy metabolism in the brain of rats. Behav Brain Res 2012; 233:526-35. [DOI: 10.1016/j.bbr.2012.05.039] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 05/09/2012] [Accepted: 05/23/2012] [Indexed: 11/22/2022]
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25
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Calabrese F, Guidotti G, Molteni R, Racagni G, Mancini M, Riva MA. Stress-induced changes of hippocampal NMDA receptors: modulation by duloxetine treatment. PLoS One 2012; 7:e37916. [PMID: 22666412 PMCID: PMC3362535 DOI: 10.1371/journal.pone.0037916] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Accepted: 04/30/2012] [Indexed: 11/18/2022] Open
Abstract
It is now well established that the glutamatergic system contributes to the pathophysiology of depression. Exposure to stress, a major precipitating factor for depression, enhances glutamate release that can contribute to structural abnormalities observed in the brain of depressed subjects. On the other hand, it has been demonstrated that NMDA antagonists, like ketamine, exert an antidepressant effect at preclinical and clinical levels. On these bases, the purpose of our study was to investigate whether chronic mild stress is associated with specific alterations of the NMDA receptor complex, in adult rats, and to establish whether concomitant antidepressant treatment could normalize such deficits. We found that chronic stress increases the expression of the obligatory GluN1 subunit, as well as of the accessory subunits GluN2A and GluN2B at transcriptional and translational levels, particularly in the ventral hippocampus. Concomitant treatment with the antidepressant duloxetine was able to normalize the increase of glutamatergic receptor subunit expression, and correct the changes in receptor phosphorylation produced by stress exposure. Our data suggest that prolonged stress, a condition that has etiologic relevance for depression, may enhance glutamate activity through post-synaptic mechanisms, by regulating NMDA receptors, and that antidepressants may in part normalize such changes. Our results provide support to the notion that antidepressants may exert their activity in the long-term also via modulation of the glutamatergic synapse.
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Affiliation(s)
- Francesca Calabrese
- Center of Neuropharmacology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Gianluigi Guidotti
- Center of Neuropharmacology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Raffaella Molteni
- Center of Neuropharmacology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
| | - Giorgio Racagni
- Center of Neuropharmacology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
- Center of Excellence on Neurodegenerative Diseases, Università degli Studi di Milano, Milan, Italy
| | - Michele Mancini
- Medical Department, Eli Lilly Italia S.p.A., Sesto Fiorentino, Italy
| | - Marco Andrea Riva
- Center of Neuropharmacology, Department of Pharmacological and Biomolecular Sciences, Università degli Studi di Milano, Milan, Italy
- Center of Excellence on Neurodegenerative Diseases, Università degli Studi di Milano, Milan, Italy
- * E-mail:
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Duric V, Duman RS. Depression and treatment response: dynamic interplay of signaling pathways and altered neural processes. Cell Mol Life Sci 2012; 70:39-53. [PMID: 22585060 DOI: 10.1007/s00018-012-1020-7] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 04/18/2012] [Accepted: 04/24/2012] [Indexed: 01/15/2023]
Abstract
Since the 1960s, when the first tricyclic and monoamine oxidase inhibitor antidepressant drugs were introduced, most of the ensuing agents were designed to target similar brain pathways that elevate serotonin and/or norepinephrine signaling. Fifty years later, the main goal of the current depression research is to develop faster-acting, more effective therapeutic agents with fewer side effects, as currently available antidepressants are plagued by delayed therapeutic onset and low response rates. Clinical and basic science research studies have made significant progress towards deciphering the pathophysiological events within the brain involved in development, maintenance, and treatment of major depressive disorder. Imaging and postmortem brain studies in depressed human subjects, in combination with animal behavioral models of depression, have identified a number of different cellular events, intracellular signaling pathways, proteins, and target genes that are modulated by stress and are potentially vital mediators of antidepressant action. In this review, we focus on several neural mechanisms, primarily within the hippocampus and prefrontal cortex, which have recently been implicated in depression and treatment response.
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Affiliation(s)
- Vanja Duric
- Department of Psychiatry, Yale University, 34 Park Street, New Haven, CT 06508, USA
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Schnell C, Janc OA, Kempkes B, Callis CA, Flügge G, Hülsmann S, Müller M. Restraint Stress Intensifies Interstitial K(+) Accumulation during Severe Hypoxia. Front Pharmacol 2012; 3:53. [PMID: 22470344 PMCID: PMC3314232 DOI: 10.3389/fphar.2012.00053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Accepted: 03/12/2012] [Indexed: 11/23/2022] Open
Abstract
Chronic stress affects neuronal networks by inducing dendritic retraction, modifying neuronal excitability and plasticity, and modulating glial cells. To elucidate the functional consequences of chronic stress for the hippocampal network, we submitted adult rats to daily restraint stress for 3 weeks (6 h/day). In acute hippocampal tissue slices of stressed rats, basal synaptic function and short-term plasticity at Schaffer collateral/CA1 neuron synapses were unchanged while long-term potentiation was markedly impaired. The spatiotemporal propagation pattern of hypoxia-induced spreading depression episodes was indistinguishable among control and stress slices. However, the duration of the extracellular direct current potential shift was shortened after stress. Moreover, K+ fluxes early during hypoxia were more intense, and the postsynaptic recoveries of interstitial K+ levels and synaptic function were slower. Morphometric analysis of immunohistochemically stained sections suggested hippocampal shrinkage in stressed rats, and the number of cells that are immunoreactive for glial fibrillary acidic protein was increased in the CA1 subfield indicating activation of astrocytes. Western blots showed a marked downregulation of the inwardly rectifying K+ channel Kir4.1 in stressed rats. Yet, resting membrane potentials, input resistance, and K+-induced inward currents in CA1 astrocytes were indistinguishable from controls. These data indicate an intensified interstitial K+ accumulation during hypoxia in the hippocampus of chronically stressed rats which seems to arise from a reduced interstitial volume fraction rather than impaired glial K+ buffering. One may speculate that chronic stress aggravates hypoxia-induced pathophysiological processes in the hippocampal network and that this has implications for the ischemic brain.
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Affiliation(s)
- Christian Schnell
- DFG Research Center Molecular Physiology of the Brain, Georg-August-Universität Göttingen Göttingen, Germany
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Guirado R, Sanchez-Matarredona D, Varea E, Crespo C, Blasco-Ibáñez JM, Nacher J. Chronic fluoxetine treatment in middle-aged rats induces changes in the expression of plasticity-related molecules and in neurogenesis. BMC Neurosci 2012; 13:5. [PMID: 22221403 PMCID: PMC3278353 DOI: 10.1186/1471-2202-13-5] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Accepted: 01/05/2012] [Indexed: 01/26/2023] Open
Abstract
Background Antidepressants promote neuronal structural plasticity in young-adult rodents, but little is known of their effects on older animals. The polysialylated form of the neural cell adhesion molecule (PSA-NCAM) may mediate these structural changes through its anti-adhesive properties. PSA-NCAM is expressed in immature neurons and in a subpopulation of mature interneurons and its expression is modulated by antidepressants in the telencephalon of young-adult rodents. Results We have analyzed the effects of 14 days of fluoxetine treatment on the density of puncta expressing PSA-NCAM and different presynaptic markers in the medial prefrontal cortex, hippocampus and amygdala of middle-aged (8 months old) rats. The density of puncta expressing PSA-NCAM increased in the dorsal cingulate cortex, as well as in different hippocampal and amygdaloid regions. In these later regions there were also increases in the density of puncta expressing glutamic acid decarboxylase 65/67 (GAD6), synaptophysin (SYN), PSA-NCAM/SYN and PSA-NCAM/GAD6, but a decrease of those expressing vesicular glutamate transporter 1 (VGluT1). Since there is controversy on the effects of antidepressants on neurogenesis during aging, we analyzed the number of proliferating cells expressing Ki67 and that of immature neurons expressing doublecortin or PSA-NCAM. No significant changes were found in the subgranular zone, but the number of proliferating cells decreased in the subventricular zone. Conclusions These results indicate that the effects of fluoxetine in middle-aged rats are different to those previously described in young-adult animals, being more restricted in the mPFC and even following an opposite direction in the amygdala or the subventricular zone.
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Affiliation(s)
- Ramon Guirado
- Neurobiology Unit and Program in Basic and Applied Neurosciences, Cell Biology Dpt., Universitat de València, Spain
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Nin MS, Martinez LA, Pibiri F, Nelson M, Pinna G. Neurosteroids reduce social isolation-induced behavioral deficits: a proposed link with neurosteroid-mediated upregulation of BDNF expression. Front Endocrinol (Lausanne) 2011; 2:73. [PMID: 22649384 PMCID: PMC3355888 DOI: 10.3389/fendo.2011.00073] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Accepted: 10/26/2011] [Indexed: 11/13/2022] Open
Abstract
The pharmacological action of selective serotonin reuptake inhibitor antidepressants may include a normalization of the decreased brain levels of the brain-derived neurotrophic factor (BDNF) and of neurosteroids such as the progesterone metabolite allopregnanolone, which are decreased in patients with depression and posttraumatic stress disorders (PTSD). The allopregnanolone and BDNF level decrease in PTSD and depressed patients is associated with behavioral symptom severity. Antidepressant treatment upregulates both allopregnanolone levels and the expression of BDNF in a manner that significantly correlates with improved symptomatology, which suggests that neurosteroid biosynthesis and BDNF expression may be interrelated. Preclinical studies using the socially isolated mouse as an animal model of behavioral deficits, which resemble some of the symptoms observed in PTSD patients, have shown that fluoxetine and derivatives improve anxiety-like behavior, fear responses and aggressive behavior by elevating the corticolimbic levels of allopregnanolone and BDNF mRNA expression. These actions appeared to be independent and more selective than the action of these drugs on serotonin reuptake inhibition. Hence, this review addresses the hypothesis that in PTSD or depressed patients, brain allopregnanolone levels, and BDNF expression upregulation may be mechanisms at least partially involved in the beneficial actions of antidepressants or other selective brain steroidogenic stimulant molecules.
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Affiliation(s)
- Mauricio Schüler Nin
- Department of Psychiatry, College of Medicine, Psychiatric Institute, University of Illinois at ChicagoChicago, IL, USA
- Coordenadoria de Aperfeicoamento de Pessoal de Nivel Superior Foundation, Ministry of Education of BrazilBrasilia, Brazil
| | - Luis A. Martinez
- Department of Psychiatry, College of Medicine, Psychiatric Institute, University of Illinois at ChicagoChicago, IL, USA
| | - Fabio Pibiri
- Department of Psychiatry, College of Medicine, Psychiatric Institute, University of Illinois at ChicagoChicago, IL, USA
| | - Marianela Nelson
- Department of Psychiatry, College of Medicine, Psychiatric Institute, University of Illinois at ChicagoChicago, IL, USA
| | - Graziano Pinna
- Department of Psychiatry, College of Medicine, Psychiatric Institute, University of Illinois at ChicagoChicago, IL, USA
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Petrik D, Lagace DC, Eisch AJ. The neurogenesis hypothesis of affective and anxiety disorders: are we mistaking the scaffolding for the building? Neuropharmacology 2011; 62:21-34. [PMID: 21945290 DOI: 10.1016/j.neuropharm.2011.09.003] [Citation(s) in RCA: 179] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 09/03/2011] [Accepted: 09/06/2011] [Indexed: 01/22/2023]
Abstract
Hypotheses are scaffoldings erected in front of a building and then dismantled when the building is finished. They are indispensable for the workman; but you mustn't mistake the scaffolding for the building. Johann Wolfgang von Goethe. The neurogenesis hypothesis of affective disorders - in its simplest form - postulates that the generation of neurons in the postnatal hippocampal dentate gyrus is involved in the etiology and treatment efficacy of major depressive disorder (MDD). The hypothesis was established in the 1990s but was built on a broad foundation of earlier research on the hippocampus, serotonin and MDD. It has gone through several growth phases fueled by discoveries both correlative and causative in nature. Recently, the hypothesis has also been broadened to also include potential relevance for anxiety disorders, like post-traumatic stress disorder (PTSD). As any hypothesis should be, it has been tested and challenged, sometimes vigorously. Here we review the current standing of the neurogenesis hypothesis of affective and anxiety disorders, noting in particular how a central postulate - that decreased neurogenesis results in depression or anxiety - has, in general, been rejected. We also review the controversies on whether treatments for these disorders, like antidepressants, rely on intact neurogenesis for their efficacy, and the existence of neurogenesis-dependent and -independent effects of antidepressants. In addition, we review the implications that the hypothesis has for the response to stress, PTSD, and the neurobiology of resilience, and highlight our own work showing that adult-generated neurons are functionally important for the behavioral response to social stress. We conclude by emphasizing how advancements in transgenic mouse technology, rodent behavioral analyses, and our understanding of the neurogenesis process will allow us to refine our conclusions and perform ever more specific experiments. Such scrutiny is critical, since if we "mistake the scaffolding for the building" we could overlook opportunities for translational impact in the clinic. This article is part of a special Issue entitled 'Anxiety and Depression'.
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Affiliation(s)
- David Petrik
- Department of Psychiatry, UT Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9070, USA
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Veena J, Srikumar BN, Mahati K, Raju TR, Shankaranarayana Rao BS. Oxotremorine treatment restores hippocampal neurogenesis and ameliorates depression-like behaviour in chronically stressed rats. Psychopharmacology (Berl) 2011; 217:239-53. [PMID: 21494789 DOI: 10.1007/s00213-011-2279-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Accepted: 03/22/2011] [Indexed: 12/21/2022]
Abstract
RATIONALE Chronic stress results in cognitive impairment, affects hippocampal neurogenesis and is known to precipitate affective disorders such as depression. In addition to stress, neurotransmitters such as acetylcholine (ACh) modulate adult neurogenesis. Earlier, we have shown that oxotremorine, a cholinergic muscarinic agonist, ameliorates stress-induced cognitive impairment and restores cholinergic function. OBJECTIVES In the current study, we have looked into the possible involvement of adult neurogenesis in cognitive restoration by oxotremorine. Further, we have assessed the effect of oxotremorine treatment on depression-like behaviour and hippocampal volumes in stressed animals. METHODS Chronic restraint stressed rats were treated with either vehicle or oxotremorine. For neurogenesis studies, proliferation, survival and differentiation of the progenitor cells in the hippocampus were examined using 5'-bromo-2-deoxyuridine immunohistochemistry. Depression-like behaviour was evaluated using forced swim test (FST) and sucrose consumption test (SCT). Volumes were estimated using Cavalieri's estimator. RESULTS Hippocampal neurogenesis was severely decreased in stressed rats. Ten days of oxotremorine treatment to stressed animals partially restored proliferation and survival, while it completely restored the differentiation of the newly formed cells. Stressed rats showed increased immobility and decreased sucrose preference in the FST and SCT, respectively, and oxotremorine ameliorated this depression-like behaviour. In addition, oxotremorine treatment recovered the stress-induced decrease in hippocampal volume. CONCLUSIONS These results indicate that the restoration of impaired neurogenesis and hippocampal volume could be associated with the behavioural recovery by oxotremorine. Our results imply the muscarinic regulation of adult neurogenesis and incite the potential utility of cholinomimetics in ameliorating cognitive dysfunction in stress-related disorders.
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Affiliation(s)
- J Veena
- Department of Neurophysiology, National Institute of Mental Health and Neuro Sciences (NIMHANS), Hosur Road, PB # 2900, Bangalore, 560 029, India
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Savitz JB, Nugent AC, Bogers W, Roiser JP, Bain EE, Neumeister A, Zarate CA, Manji HK, Cannon DM, Marrett S, Henn F, Charney DS, Drevets WC. Habenula volume in bipolar disorder and major depressive disorder: a high-resolution magnetic resonance imaging study. Biol Psychiatry 2011; 69:336-43. [PMID: 21094939 PMCID: PMC3030670 DOI: 10.1016/j.biopsych.2010.09.027] [Citation(s) in RCA: 138] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Revised: 09/09/2010] [Accepted: 09/12/2010] [Indexed: 11/17/2022]
Abstract
BACKGROUND Increased activity of the habenula has been implicated in the etiology of major depressive disorder (MDD), in which reductions in habenula volume are present after death. We conducted the first magnetic resonance imaging analysis of habenula volume in MDD and bipolar disorder (BD). METHODS High-resolution images (resolution approximately .4 mm(3)) were acquired with a 3T scanner, and a pulse sequence was optimized for tissue contrast resolution. The habenula was manually segmented by one rater blind to diagnosis. Seventy-four healthy control subjects (HC) were compared with both medicated (lithium/divalproex, n = 15) and unmedicated, depressed BD (n = 22) patients; unmedicated, depressed MDD patients (n = 28); and unmedicated MDD patients in remission (n = 32). RESULTS The unmedicated BD patients displayed significantly smaller absolute (p < .01) and normalized (p < .05) habenula volumes than the HC subjects. In post hoc assessments analyzing men and women separately, the currently-depressed women with MDD had smaller absolute (p < .05) habenula volumes than the HC women. None of the other psychiatric groups differed significantly from the HC group. CONCLUSIONS We provide further evidence for the involvement of the habenula in affective illness but suggest that a reduction in volume might be more pronounced in unmedicated, depressed BD subjects and female currently depressed MDD subjects. The habenula plays major roles in the long-term modification of monoamine transmission and behavioral responses to stress and in the suppression of dopamine cell activity after the absence of an expected reward. A reduction in habenula volume might thus have functional consequences that contribute to the risk for developing affective disease.
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Affiliation(s)
- Jonathan B Savitz
- Mood and Anxiety Disorders Program, National Institutes of Health/National Institute of Mental Health, Bethesda, Maryland, USA.
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Chen F, Madsen TM, Wegener G, Nyengaard JR. Imipramine treatment increases the number of hippocampal synapses and neurons in a genetic animal model of depression. Hippocampus 2010; 20:1376-84. [DOI: 10.1002/hipo.20718] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Christian KM, Miracle AD, Wellman CL, Nakazawa K. Chronic stress-induced hippocampal dendritic retraction requires CA3 NMDA receptors. Neuroscience 2010; 174:26-36. [PMID: 21108993 DOI: 10.1016/j.neuroscience.2010.11.033] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 11/12/2010] [Accepted: 11/15/2010] [Indexed: 01/06/2023]
Abstract
Chronic stress induces dendritic retraction in the hippocampal CA3 subregion, but the mechanisms responsible for this retraction and its impact on neural circuitry are not well understood. To determine the role of NMDA (N-methyl-d-aspartic acid) receptor (NMDAR)-mediated signaling in this process, we compared the effects of chronic immobilization stress (CIS) on hippocampal dendritic morphology, hypothalamic-pituitary-adrenal (HPA) axis activation, and anxiety-related and hippocampus-dependent behaviors, in transgenic male mice in which the NMDAR had been selectively deleted in CA3 pyramidal cells and in non-mutant littermates. We found that CIS exposure for 10 consecutive days in non-mutant mice effectively induces HPA axis activation and dendritic retraction of CA3 short-shaft pyramidal neurons, but not CA3 long-shaft pyramidal neurons, suggesting a differential cellular stress response in this region. Dendritic reorganization of short-shaft neurons occurred throughout the longitudinal axis of the hippocampus and, in particular, in the ventral pole of this structure. We also observed a robust retraction of dendrites in dorsal CA1 pyramidal neurons in the non-mutant C57BL/6 mouse strain. Strikingly, chronic stress-induced dendritic retraction was not evident in any of the neurons in either CA3 or CA1 in the mutant mice that had a functional lack of NMDARs restricted to CA3 pyramidal neurons. Interestingly, the prevention of dendritic retraction in the mutant mice had a minimal effect on HPA axis activation and behavioral alterations that were induced by chronic stress. These data support a role for NMDAR-dependent glutamatergic signaling in CA3 in the cell-type specific induction of dendritic retraction in two hippocampal subregions following chronic stress.
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Affiliation(s)
- K M Christian
- Unit on Genetics of Cognition and Behavior, National Institute of Mental Health, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892, USA
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Beneficial Effects of Tianeptine on Hippocampus-Dependent Long-Term Memory and Stress-Induced Alterations of Brain Structure and Function. Pharmaceuticals (Basel) 2010. [PMCID: PMC4034085 DOI: 10.3390/ph3103143] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Tianeptine is a well-described antidepressant which has been shown to prevent stress from producing deleterious effects on brain structure and function. Preclinical studies have shown that tianeptine blocks stress-induced alterations of neuronal morphology and synaptic plasticity. Moreover, tianeptine prevents stress from impairing learning and memory, and, importantly, demonstrates memory-enhancing properties in the absence of stress. Recent research has indicated that tianeptine works by normalizing glutamatergic neurotransmission, a mechanism of action that may underlie its effectiveness as an antidepressant. These findings emphasize the value in focusing on the mechanisms of action of tianeptine, and specifically, the glutamatergic system, in the development of novel pharmacotherapeutic strategies in the treatment of depression.
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Zoladz PR, Park CR, Muñoz C, Fleshner M, Diamond DM. Tianeptine: an antidepressant with memory-protective properties. Curr Neuropharmacol 2010; 6:311-21. [PMID: 19587852 PMCID: PMC2701287 DOI: 10.2174/157015908787386096] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Revised: 08/15/2008] [Accepted: 08/25/2008] [Indexed: 01/17/2023] Open
Abstract
The development of effective pharmacotherapy for major depression is important because it is such a widespread and debilitating mental disorder. Here, we have reviewed preclinical and clinical studies on tianeptine, an atypical antidepressant which ameliorates the adverse effects of stress on brain and memory. In animal studies, tianeptine has been shown to prevent stress-induced morphological sequelae in the hippocampus and amygdala, as well as to prevent stress from impairing synaptic plasticity in the prefrontal cortex and hippocampus. Tianeptine also has memory-protective characteristics, as it blocks the adverse effects of stress on hippocampus-dependent learning and memory. We have further extended the findings on stress, memory and tianeptine here with two novel observations: 1) stress impairs spatial memory in adrenalectomized (ADX), thereby corticosterone-depleted, rats; and 2) the stress-induced impairment of memory in ADX rats is blocked by tianeptine. These findings are consistent with previous research which indicates that tianeptine produces anti-stress and memory-protective properties without altering the response of the hypothalamic-pituitary-adrenal axis to stress. We conclude with a discussion of findings which indicate that tianeptine accomplishes its anti-stress effects by normalizing stress-induced increases in glutamate in the hippocampus and amygdala. This finding is potentially relevant to recent research which indicates that abnormalities in glutamatergic neurotransmission are involved in the pathogenesis of depression. Ultimately, tianeptine’s prevention of depression-induced sequelae in the brain is likely to be a primary factor in its effectiveness as a pharmacological treatment for depression.
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Soetanto A, Wilson RS, Talbot K, Un A, Schneider JA, Sobiesk M, Kelly J, Leurgans S, Bennett DA, Arnold SE. Association of anxiety and depression with microtubule-associated protein 2- and synaptopodin-immunolabeled dendrite and spine densities in hippocampal CA3 of older humans. ACTA ACUST UNITED AC 2010; 67:448-57. [PMID: 20439826 DOI: 10.1001/archgenpsychiatry.2010.48] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
CONTEXT Chronic psychological distress has deleterious effects on many of the body's physiological systems. In experimental animal models, chronic stress leads to neuroanatomic changes in the hippocampus, in particular a decrease in the length and branching of dendrites as well as a decrease in the number of dendritic spines. OBJECTIVES To examine whether analogous distress-related neuroanatomic changes occur in humans and whether such changes might also be related to cognitive dysfunction observed in older people who report greater psychological distress. DESIGN Postmortem study of brain tissues from participants of the Religious Orders Study, an ongoing population-based clinicopathological study of aging and cognition. SETTING The Rush University Religious Orders Study and the University of Pennsylvania Cellular and Molecular Neuropathology Program. PARTICIPANTS Seventy-two deceased participants of the Religious Orders Study. MAIN OUTCOME MEASURES Densities of microtubule-associated protein 2-immunolabeled dendrites and synaptopodin-immunolabeled dendritic spines in the CA3 subfield of the hippocampus, quantified using semiautomated image acquisition and analysis. RESULTS Higher levels of trait anxiety and longitudinal depression scores were associated with decreased densities of dendrites and spines in CA3. Dendrite and spine densities did not correlate with an index of global cognition or with densities of common age-related pathological changes. CONCLUSIONS Regressive neuronal changes occur in humans who experience greater psychological distress. These changes are analogous to neuronal changes in animal models of chronic stress.
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Affiliation(s)
- Ainie Soetanto
- Cellular and Molecular Neuropathology Program, Center for Neurobiology and Behavior, Department of Psychiatry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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Chu CC, Wang JJ, Chen KT, Shieh JP, Wang LK, Shui HA, Ho ST. Neurotrophic effects of tianeptine on hippocampal neurons: a proteomic approach. J Proteome Res 2010; 9:936-44. [PMID: 20000655 DOI: 10.1021/pr900799b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Tianeptine, an atypical tricyclic antidepressant with unique characteristics, can improve memory and prevent stress-induced hippocampal damage. It has neuroplastic and neurotrophic effects on hippocampal neurons and can prevent dendritic atrophy of the hippocampus in certain pathological conditions. To obtain a better understanding of the underlying mechanisms, we performed a proteomic analysis on tianeptine-treated hippocampal neurons. Primary hippocampal neurons were prepared from fetal Sprague-Dawley rats, eliminating glia cells by addition of cytosine beta-D-arabinofuranoside at day 2 in vitro (DIV2). The neurons were treated with tianeptine (10 microg/mL) or vehicle at DIV3, then harvested at DIV4 or DIV9 for immunocytochemical analysis of, respectively, neurite outgrowth or synapse formation. A proteomics analysis was performed on DIV4 neurons and the data were confirmed by Western blot analysis. Using specific markers, we demonstrated that tianeptine can augment neurite growth and promote synaptic contacts in cultured hippocampal neurons. The proteomics analysis identified 11 differentially expressed proteins, with roles in neurite growth, metabolism of neurotrophic substances, synaptogenesis, and synaptic activity homeostasis. The data shed light on the mechanisms underlying the neurotrophic effect of tianeptine observed in both animal studies and the clinic.
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Affiliation(s)
- Chin-Chen Chu
- Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan
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39
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McEwen BS, Chattarji S, Diamond DM, Jay TM, Reagan LP, Svenningsson P, Fuchs E. The neurobiological properties of tianeptine (Stablon): from monoamine hypothesis to glutamatergic modulation. Mol Psychiatry 2010; 15:237-49. [PMID: 19704408 PMCID: PMC2902200 DOI: 10.1038/mp.2009.80] [Citation(s) in RCA: 336] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Tianeptine is a clinically used antidepressant that has drawn much attention, because this compound challenges traditional monoaminergic hypotheses of depression. It is now acknowledged that the antidepressant actions of tianeptine, together with its remarkable clinical tolerance, can be attributed to its particular neurobiological properties. The involvement of glutamate in the mechanism of action of the antidepressant tianeptine is consistent with a well-developed preclinical literature demonstrating the key function of glutamate in the mechanism of altered neuroplasticity that underlies the symptoms of depression. This article reviews the latest evidence on tianeptine's mechanism of action with a focus on the glutamatergic system, which could provide a key pathway for its antidepressant action. Converging lines of evidences demonstrate actions of tianeptine on the glutamatergic system, and therefore offer new insights into how tianeptine may be useful in the treatment of depressive disorders.
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Affiliation(s)
- Bruce S. McEwen
- Alfred E. Mirsky Professor Head, Harold and Margaret Milliken Hatch Laboratory of Neuroendocrinology. The Rockefeller University 1230 York Avenue New York, NY 10021, USA, Phone: +1 212 327 8624
| | - Sumantra Chattarji
- National Center for Biological Sciences, Bangladore 560065, India, Phone: +91 80 23636421
| | - David M. Diamond
- Medical Research Division, Veterans Hospital, 13000 Bruce B. Downs Blvd., Tampa, FL, 33612;Center for Preclinical and Clinical Research on PTSD; Departments of Psychology and Molecular Pharmacology and Physiology, University of South Florida, 4202 E. Fowler Ave., PCD 4118G, Tampa, FL, 33620, USA, Phone: +1 813974048
| | - Thérèse M. Jay
- INSERM, Physiopathologie des Maladies Psychiatriques, U894 and Université Paris Descartes, Faculté de Médecine Paris Descartes, Paris, France, Phone: +33 1 40788631
| | - Lawrence P. Reagan
- Department of Pharmacology, Physiology and Neuroscience, University of South Carolina School of Medicine, Columbia, SC 29208, Phone: 803 733-3237
| | - Per Svenningsson
- Center for Molecular Medicine, Department of Physiology and Pharmacology, Karolinska Institutet, 17177 Stockholm, Sweden, Phone: +46 (8) 52 48 79 26
| | - Eberhard Fuchs
- Clinical Neurobiology Laboratory, German Primate Center, Department of Neurology and DFG Research Center Molecular Physiology of the Brain (CMPB), University of Göttingen, 37077 Göttingen, Germany, Phone: +49-551-3851 130
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40
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Tanti A, Belzung C. Open questions in current models of antidepressant action. Br J Pharmacol 2010; 159:1187-200. [PMID: 20132212 DOI: 10.1111/j.1476-5381.2009.00585.x] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Research on depression and antidepressant drugs is necessary, as many patients display poor response to therapy. Different symptomatic and pathophysiological features have been proposed as end points of the depressive phenotype and of the antidepressant action, including anhedonia, depressed mood, alterations in morphology and activity of some brain areas (amygdala, nucleus accumbens, hippocampus, prefrontal cortex and cingulate cortex), modifications in the connectivity between brain structures, changes in neurotransmitters (serotonin, noradrenaline, glutamate and neuropeptides), brain plasticity (neurogenesis, neurotrophins) and abnormal function of the hypothalamic-pituitary adrenal axis. However, few models have been proposed to describe how these end points could induce the depressive phenotype and are involved in the mechanism of action of antidepressants. Here we propose a connectionist-inspired network of depression and antidepressant action, in which the different aetiological factors participating in the release of a depressive episode are represented by input nodes, the different symptomatic as well as pathophysiological end points are represented by an intermediate layer, and the onset of depression or of comorbid disease is represented by the output node. The occurrence of depression and the mechanism of the antidepressant action thus depend upon the weight of the interactions between the different end points, none of them being per se crucial to the onset of a depressive phenotype or to the antidepressant action. This model is heuristic to draw future lines of research concerning new antidepressant therapies, designing new animal models of depression and for a better understanding of the depressive pathology and of its comorbid pathology such as anxiety disorders.
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Affiliation(s)
- A Tanti
- INSERM U-930, Université François Rabelais Tours, UFR Sciences et Techniques, Parc Grandmont, Tours, France
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Hoffman SW, Harrison C. The interaction between psychological health and traumatic brain injury: a neuroscience perspective. Clin Neuropsychol 2009; 23:1400-15. [PMID: 19882478 DOI: 10.1080/13854040903369433] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The occurrence of traumatic brain injury (TBI) and psychological health issues in the current theater of military operations has become a major factor in planning for the long-term healthcare of our wounded warriors. Post-traumatic stress disorder (PTSD) can co-exist with brain injury in military members who have been exposed to blasts. Specific areas of the brain may be more susceptible to damage from blasts. In particular, damage to the prefrontal cortex can lead to disinhibition of cerebral structures that control fear and anxiety. Reactive systemic inflammatory processes related to TBI may also impair psychological health. Impaired psychological health may lead to increased psychological distress that impedes brain repair due to the release of stress-related hormones. Since the external environment has been shown to exert a significant influence on the internal environment of the organism, enriching the external environment may well reduce anxiety and facilitate the neuroplasticity of brain cells, thus promoting recovery of function after TBI.
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Affiliation(s)
- Stuart W Hoffman
- Henry M. Jackson Foundation for the Advancement of Military Medicine Defense and Veterans Brain Injury Center-Johnstown, PA 15905, USA.
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Alzoubi K, Abdul-Razzak K, Khabour O, Al-Tuweiq G, Alzubi M, Alkadhi K. Adverse effect of combination of chronic psychosocial stress and high fat diet on hippocampus-dependent memory in rats. Behav Brain Res 2009; 204:117-23. [DOI: 10.1016/j.bbr.2009.05.025] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2009] [Revised: 05/15/2009] [Accepted: 05/22/2009] [Indexed: 02/09/2023]
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Amygdala volume in depressed patients with bipolar disorder assessed using high resolution 3T MRI: the impact of medication. Neuroimage 2009; 49:2966-76. [PMID: 19931399 DOI: 10.1016/j.neuroimage.2009.11.025] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2009] [Revised: 11/06/2009] [Accepted: 11/11/2009] [Indexed: 12/24/2022] Open
Abstract
MRI-based reports of both abnormally increased and decreased amygdala volume in bipolar disorder (BD) have surfaced in the literature. Two major methodological weaknesses characterizing extant studies are treatment with medication and inaccurate segmentation of the amygdala due to limitations in spatial and tissue contrast resolution. Here, we acquired high-resolution images (voxel size=0.55 x 0.55 x 0.60 mm) using a GE 3T MRI scanner, and a pulse sequence optimized for tissue contrast resolution. The amygdala was manually segmented by one rater blind to diagnosis, using coronal images. Eighteen unmedicated (mean medication-free period 11+/-10 months) BD subjects were age and gender matched with 18 healthy controls, and 17 medicated (lithium or divalproex) subjects were matched to 17 different controls. The unmedicated BD patients displayed smaller left and right amygdala volumes than their matched control group (p<0.01). Conversely, the BD subjects undergoing medication treatment showed a trend towards greater amygdala volumes than their matched HC sample (p=0.051). Right and left amygdala volumes were larger (p<0.05) or trended larger, respectively, in the medicated BD sample compared with the unmedicated BD sample. The two control groups did not differ from each other in either left or right amygdala volume. BD patients treated with lithium have displayed increased gray matter volume of the cortex and hippocampus relative to untreated BD subjects in previous studies. Here we extend these results to the amygdala. We raise the possibility that neuroplastic changes in the amygdala associated with BD are moderated by some mood stabilizing medications.
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Gos T, Krell D, Bielau H, Steiner J, Mawrin C, Trübner K, Brisch R, Bernstein HG, Jankowski Z, Bogerts B. Demonstration of disturbed activity of orbitofrontal pyramidal neurons in depressed patients by the AgNOR staining method. J Affect Disord 2009; 118:131-8. [PMID: 19278730 DOI: 10.1016/j.jad.2009.02.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Revised: 02/14/2009] [Accepted: 02/14/2009] [Indexed: 11/28/2022]
Abstract
BACKGROUND The aim to find the morphological biomarker of disturbed activity of the orbitofrontal cortex (OFC) in depression was approached by the karyometric analysis of pyramidal neurons. METHODS The study was performed on paraffin-embedded brains from 19 depressed patients from both major depressive disorder (MDD) and bipolar disorder (BD) diagnostic groups, including 9 suicides, and 24 matched controls. The karyometric parameters of medial OFC layer III and V pyramidal neurons bilaterally were evaluated by argyrophilic nucleolar organiser region (AgNOR) silver staining method. RESULTS The enlarged nuclear area was found in layer V pyramidal neurons in the right OFC in non-suicides compared to suicides and controls, which was most likely the effect of neuroleptics. The intra-group comparisons between the hemispheres suggest the disturbed orbitofrontal lateralisation in depressed patients (predominantly in suicides) with moderate distinctness of the MDD and the BD diagnostic groups. LIMITATIONS A major limitation of this study is a relatively small number of cases. A further limitation is given by the lack of data on drug exposure across the whole lifespan. CONCLUSION The results suggest disturbed activity of OFC pyramidal neurons in depression, distinct in suicide and the diagnostic groups of mood disorders. The non-suicidal patients seem to benefit from neuroleptics, which most likely increase the activity of the subpopulation of OFC pyramidal neurons.
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Affiliation(s)
- Tomasz Gos
- Institute of Forensic Medicine, Medical University of Gdańsk, Poland.
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Nakajima S, Ohsawa I, Nagata K, Ohta S, Ohno M, Ijichi T, Mikami T. Oral supplementation with melon superoxide dismutase extract promotes antioxidant defences in the brain and prevents stress-induced impairment of spatial memory. Behav Brain Res 2009; 200:15-21. [PMID: 19373977 DOI: 10.1016/j.bbr.2008.12.038] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The purpose of this study was to investigate the effect of antioxidant ingestion on stress-induced impairment of cognitive memory. Male C57BL/6 mice were divided into four groups as follows: (1) control mice (C mice) fed in a normal cage without immobilization; (2) restraint-stressed (RS mice) fed in a small cage; (3) vitamin E mice (VE mice), mice were fed in a small cage with a diet supplemented with vitamin E; (4) GliSODin mice (GS mice) fed in a small cage with a diet supplemented with GliSODin. RS, VE and GS mice were exposed to 12 h of immobilization daily. Five weeks later, spatial learning was measured using the Morris Water Maze (MWM) test. After water maze testing, we performed immunohistochemical analysis using 4-hydroxy-2-noneral (4-HNE) and an anti-Ki67 antibody. 4-HNE is a marker of lipid peroxidation. RS mice showed impaired spatial learning performance and an increased number of 4-HNE-positive cells in the granule cell layer (GCL) of the hippocampal dentate gyrus when compared to C mice. Moreover, RS mice showed a decreased number of Ki67-positive cells in the subgranular zone (SGZ). GS mice showed better spatial learning memory than RS mice. The number of 4-HNE-positive cells in the GCL of GS mice was significantly less than that of RS mice. The number of Ki67-positive cells in the SGZ of GS mice was significantly greater than that of RS mice. These finding suggests that GliSODin prevents stress-induced impairment of cognitive function and maintains neurogenesis in the hippocampus through antioxidant activity.
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Affiliation(s)
- Sanae Nakajima
- Department of Biochemistry and Cell Biology, Institute of Gerontology, Nippon Medical School, Kawasaki, Kanagawa 211-8533, Japan
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Bhatnagar M, Sharma D, Salvi M. Neuroprotective effects of Withania somnifera dunal.: A possible mechanism. Neurochem Res 2009; 34:1975-83. [PMID: 19444606 DOI: 10.1007/s11064-009-9987-7] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2009] [Accepted: 04/25/2009] [Indexed: 10/20/2022]
Abstract
Present study was carried out to understand the possible mechanism of neuroprotective action of the root extract of Withania somnifera Dunal (WS). The study is focused on WS mediated inhibition of nitric oxide production, which is known to mediate neurodegeneration during stress. Adult mice (28 +/- 5 g) were exposed to restraint stress for 30 days. Activity of NADPH diaphorase (NADPH-d) and factors (Acetylcholine, serotonin and corticosterone), which regulates NADPH-d activity were studied. Treatment with WS extract for 30 days during stress, significantly reversed the stress induced NADPH-d activation. Observations suggest that inhibition of NADPH-d by WS is not a direct effect of extract on NADPH-d, instead it inhibits via suppressing corticosterone release and activating cholineacetyltransferase, which in turn increase serotonin level in hippocampus to inhibit NADPH-d. Together, the main mechanism underlying the neuroprotective effects of WS can be attributed to its role in the down regulation of nNOS and neurochemical alterations of specific neurotransmitter systems. These observations thus suggest that WS root extract could be developed as a potential preventive or therapeutic drug for stress induced neurological disorders.
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Gos T, Günther K, Bielau H, Dobrowolny H, Mawrin C, Trübner K, Brisch R, Steiner J, Bernstein HG, Jankowski Z, Bogerts B. Suicide and depression in the quantitative analysis of glutamic acid decarboxylase-Immunoreactive neuropil. J Affect Disord 2009; 113:45-55. [PMID: 18538859 DOI: 10.1016/j.jad.2008.04.021] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Revised: 04/25/2008] [Accepted: 04/25/2008] [Indexed: 10/22/2022]
Abstract
BACKGROUND Alterations of GABAergic neurotransmission are assumed to play a crucial role in the pathophysiology of mood disorders. Glutamic acid decarboxylase (GAD) is the key enzyme of GABA synthesis. METHODS Immunohistochemical staining of GAD 65/67 was performed in the orbitofrontal, anterior cingulate and dorsolateral prefrontal cortex (DLC), the entorhinal cortex (EC), the hippocampal formation, and the medial dorsal and lateral dorsal thalamic nuclei, with consecutive determination of GAD-immunoreactive (-ir) neuropil relative density. The study was performed on paraffin-embedded brains from 21 depressed patients (14 of whom had committed suicide) and 18 matched controls. The data were tested using Kruskal-Wallis, Mann-Whitney (U) and Spearman statistical procedures. RESULTS As shown by post-hoc U-tests, an increase in the relative density of GAD-ir neuropil was present in the hippocampal formation, specific for suicidal patients. The EC was the only area where non-suicidal patients also revealed an increase compared with controls. On the contrary, the DLC was the only area where a significant decrease existed, specific for non-suicidal patients. Numerous negative correlations were found between the investigated parameter and psychotropic medication. LIMITATIONS A major limitation of this study is the relatively small case number. A further limitation is given by the lack of data on drug exposure across the whole life span. The possible impact of unipolar-bipolar dichotomy of mood disorders on the obtained results should also be considered. CONCLUSION The study, revealing predominantly an increased relative density of GAD-ir neuropil, suggests the diathesis of GABAergic system specific for depressed suicidal patients.
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Affiliation(s)
- Tomasz Gos
- Institute of Forensic Medicine, Medical University of Gdańsk, Poland.
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Bipolar and major depressive disorder: neuroimaging the developmental-degenerative divide. Neurosci Biobehav Rev 2009; 33:699-771. [PMID: 19428491 DOI: 10.1016/j.neubiorev.2009.01.004] [Citation(s) in RCA: 361] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Accepted: 01/14/2009] [Indexed: 01/30/2023]
Abstract
Both major depressive disorder and bipolar disorder are the subject of a voluminous imaging and genetics literature. Here, we attempt a comprehensive review of MRI and metabolic PET studies conducted to date on these two disorders, and interpret our findings from the perspective of developmental and degenerative models of illness. Elevated activity and volume loss of the hippocampus, orbital and ventral prefrontal cortex are recurrent themes in the literature. In contrast, dorsal aspects of the PFC tend to display hypometabolism. Ventriculomegaly and white matter hyperintensities are intimately associated with depression in elderly populations and likely have a vascular origin. Important confounding influences are medication, phenotypic and genetic heterogeneity, and technological limitations. We suggest that environmental stress and genetic risk variants interact with each other in a complex manner to alter neural circuitry and precipitate illness. Imaging genetic approaches hold out promise for advancing our understanding of affective illness.
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Fernández ME, Alfonso J, Brocco MA, Frasch AC. Conserved cellular function and stress-mediated regulation among members of the proteolipid protein family. J Neurosci Res 2009; 88:1298-308. [DOI: 10.1002/jnr.22298] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Impact of the brain-derived neurotrophic factor Val66Met polymorphism on levels of hippocampal N-acetyl-aspartate assessed by magnetic resonance spectroscopic imaging at 3 Tesla. Biol Psychiatry 2008; 64:856-62. [PMID: 18707679 PMCID: PMC2586327 DOI: 10.1016/j.biopsych.2008.07.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 06/19/2008] [Accepted: 07/07/2008] [Indexed: 02/08/2023]
Abstract
BACKGROUND This study was conducted to corroborate prior evidence of an effect of the brain-derived neurotrophic factor (BDNF) valine (val) to methionine (met) amino acid substitution at codon 66 (val66met) polymorphism on measures of N-acetyl-aspartate (NAA) containing compounds in healthy subjects. METHODS The NAA to creatine (Cre) ratio (NAA/Cre), NAA to choline (Cho) ratio (NAA/Cho), and Cho to Cre ratio (Cho/Cre) were measured in the left and right hippocampi, left and right dorsolateral prefrontal cortices, occipital lobe, anterior cingulate, and white matter of the centrum semiovale of 69 carefully screened healthy volunteers utilizing proton magnetic resonance spectroscopic imaging (MRSI) at 3 Tesla (T). RESULTS Val/met subjects exhibited significantly reduced levels of left hippocampal NAA/Cre and NAA/Cho compared with val/val subjects. This effect was independent of age, IQ, number of voxels, hippocampal volume, or gray matter content in the voxels of interest. Analysis of other brain regions showed no effect of BDNF genotype on NAA measures. CONCLUSIONS We confirmed the association between the met-BDNF variant and reduced levels of hippocampal NAA found with a similar technique at 1.5T. The consonance of our results with prior findings adds to the evidence that the BDNF val/met genotype affects hippocampal biology with implications for a variety of neuropsychiatric disorders.
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