1
|
Hirose Y, Oda Y, Yoshino K, Yano F, Kimura M, Kimura H, Iyo M, Shirayama Y. Reduction of claudin-5 and aquaporin-4 in the rat hippocampal CA-1 and CA-3 regions of a learned helplessness model of depression. Pharmacol Biochem Behav 2024; 234:173676. [PMID: 37992974 DOI: 10.1016/j.pbb.2023.173676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 11/09/2023] [Accepted: 11/09/2023] [Indexed: 11/24/2023]
Abstract
BACKGROUND Although findings from both animal and clinical research indicate that the blood-brain barrier (BBB) contributes to the pathogenesis of various psychiatric disorders (including depression), the underlying mechanisms are unknown. We investigated the levels of the tight-junction proteins claudin-5 and aquaporin-4 (AQP-4) in astrocytes of learned helplessness (LH) rats (an animal model of depression) and non-LH rats (a model of resilience). METHODS We administered inescapable mild electric shock to rats and then identified the LH and non-LH rats by a post-shock test. The expressions of claudin-5 and AQP-4 in several brain regions of the LH and non-LH rats were then evaluated by a western blot analysis. RESULTS The levels of both claudin-5 and AQP-4 in the CA-1 and CA-3 hippocampal areas of the LH group were significantly lower than those of the control group, whereas those of the non-LH rats were not significantly different from those of the control and LH rats. CONCLUSIONS These results suggest that LH rats but not non-LH rats experienced down-regulations of claudin-5 and AQP-4 in the CA-1 and CA-3. It is possible that a region-specific modulation of claudin-5 and AQP-4 is involved in the mechanisms of vulnerability but not resilience in depression.
Collapse
Affiliation(s)
- Yuki Hirose
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan
| | - Yasunori Oda
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan.
| | - Kouhei Yoshino
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan
| | - Fumiaki Yano
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan
| | - Makoto Kimura
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan
| | - Hiroshi Kimura
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan; Department of Psychiatry, School of Medicine, International University of Health and Welfare, 4-3 Kozunomori, Narita, Chiba 286-8686, Japan
| | - Masaomi Iyo
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuou-ku, Chiba, Chiba 260-8670, Japan
| | - Yukihiko Shirayama
- Department of Psychiatry, Teikyo University Chiba Medical Center, 3426-3 Anesaki, Ichihara, Chiba 290-0111, Japan
| |
Collapse
|
2
|
Yoshino K, Oda Y, Kimura M, Kimura H, Nangaku M, Shirayama Y, Iyo M. The alterations of glutamate transporter 1 and glutamine synthetase in the rat brain of a learned helplessness model of depression. Psychopharmacology (Berl) 2020; 237:2547-2553. [PMID: 32445055 DOI: 10.1007/s00213-020-05555-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2019] [Accepted: 05/11/2020] [Indexed: 01/03/2023]
Abstract
BACKGROUND Although glutamate transmission via astrocytes has been proposed to contribute to the pathophysiology of depression, the precise mechanisms are unknown. Herein, we investigated the levels of glutamate transporter-1 (GLT-1) and glutamine synthetase (GS) of astrocytes in learned helplessness (LH) rats (an animal model of depression) and non-LH rats (an animal model of resilience). METHODS We administered inescapable mild electric shock to rats and then discriminated the LH and non-LH rats by a post-shock test. Almost 55% of the rats acquired LH. We then measured the expressions of GLT-1 and GS in several brain regions of LH and non-LH rats by Western blot analysis. RESULTS The levels of GLT-1 and GS in the CA-1, CA-3, dentate gyrus (DG), medial prefrontal cortex (mPF), and nucleus accumbens (NAc) of the LH group were significantly higher than those of the control group. The GS levels in the amygdala of the LH rats were significantly decreased compared to the controls. There were significant differences in GLT-1 and GS levels between the non-LH and LH rats in the CA-1 and CA-3. CONCLUSIONS These results suggest that the LH rats experienced up-regulations of GLT-1 and GS in the CA-1, CA-3, DG, mPF, and NAc and a down-regulation of GS in the amygdala. It is possible that the effects of the GLT-1 and GS levels on astrocytes in the CA-1 and CA-3 are critical for the differentiation of resilience from vulnerability.
Collapse
Affiliation(s)
- Kouhei Yoshino
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana Chuou-ku, Chiba, Chiba, 260-8670, Japan
| | - Yasunori Oda
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana Chuou-ku, Chiba, Chiba, 260-8670, Japan.
| | - Makoto Kimura
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana Chuou-ku, Chiba, Chiba, 260-8670, Japan
| | - Hiroshi Kimura
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana Chuou-ku, Chiba, Chiba, 260-8670, Japan
| | - Masahito Nangaku
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana Chuou-ku, Chiba, Chiba, 260-8670, Japan
| | - Yukihiko Shirayama
- Department of Psychiatry, Teikyo University Chiba Medical Center, 3426-3 Anesaki, Ichihara, Chiba, 290-0111, Japan
| | - Masaomi Iyo
- Department of Psychiatry, Chiba University Graduate School of Medicine, 1-8-1 Inohana Chuou-ku, Chiba, Chiba, 260-8670, Japan
| |
Collapse
|
3
|
No association of GRIN2A polymorphisms with the major depressive disorder in the Chinese Han origin. Psychiatr Genet 2018; 28:120-121. [PMID: 30260902 DOI: 10.1097/ypg.0000000000000207] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
4
|
No association of NR3C1 polymorphisms with major depressive disorder in the Chinese Han population. Psychiatr Genet 2018; 28:38-39. [PMID: 29381656 DOI: 10.1097/ypg.0000000000000190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
5
|
Sriram CS, Jangra A, Gurjar SS, Mohan P, Bezbaruah BK. Edaravone abrogates LPS-induced behavioral anomalies, neuroinflammation and PARP-1. Physiol Behav 2015; 154:135-44. [PMID: 26522738 DOI: 10.1016/j.physbeh.2015.10.029] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Revised: 10/17/2015] [Accepted: 10/27/2015] [Indexed: 12/21/2022]
Abstract
Poly(ADP-ribose) polymerase-1 (PARP-1) is a DNA nick-sensor enzyme that functions at the center of cellular stress response and affects the immune system at several key points, and thus modulates inflammatory diseases. Our previous study demonstrated that lipopolysaccharide (LPS)-induced depressive-like behavior in mice can be ameliorated by 3-aminobenzamide, which is a PARP-1 inhibitor. In the present study we've examined the effect of a free radical scavenger, edaravone pretreatment against LPS-induced anxiety and depressive-like behavior as well as various hippocampal biochemical parameters including PARP-1. Male Swiss albino mice were treated with edaravone (3 & 10mg/kgi.p.) once daily for 14days. On the 14th day 30min after edaravone treatment mice were challenged with LPS (1mg/kgi.p.). After 3h and 24h of LPS administration we've tested mice for anxiety and depressive-like behaviors respectively. Western blotting analysis of PARP-1 in hippocampus was carried out after 12h of LPS administration. Moreover, after 24h of LPS administration serum corticosterone, hippocampal BDNF, oxido-nitrosative stress and pro-inflammatory cytokines were estimated by ELISA. Results showed that pretreatment of edaravone (10mg/kg) ameliorates LPS-induced anxiety and depressive-like behavior. Western blotting analysis showed that LPS-induced anomalous expression of PARP-1 significantly reverses by the pretreatment of edaravone (10mg/kg). Biochemical analyses revealed that LPS significantly diminishes BDNF, increases pro-inflammatory cytokines and oxido-nitrosative stress in the hippocampus. However, pretreatment with edaravone (10mg/kg) prominently reversed all these biochemical alterations. Our study emphasized that edaravone pretreatment prevents LPS-induced anxiety and depressive-like behavior, mainly by impeding the inflammation, oxido-nitrosative stress and PARP-1 overexpression.
Collapse
Affiliation(s)
- Chandra Shaker Sriram
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education & Research (NIPER), Guwahati, Assam 781032, India
| | - Ashok Jangra
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education & Research (NIPER), Guwahati, Assam 781032, India
| | - Satendra Singh Gurjar
- Department of Biotechnology, National Institute of Pharmaceutical Education and Research (NIPER), Guwahati, Assam 781032, India
| | - Pritam Mohan
- Department of Pharmacology & Toxicology, College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, Assam 781022, India
| | - Babul Kumar Bezbaruah
- Department of Pharmacology & Toxicology, National Institute of Pharmaceutical Education & Research (NIPER), Guwahati, Assam 781032, India; Department of Pharmacology, Gauhati Medical College, Guwahati, Assam 781032, India.
| |
Collapse
|
6
|
Bartova L, Meyer BM, Diers K, Rabl U, Scharinger C, Popovic A, Pail G, Kalcher K, Boubela RN, Huemer J, Mandorfer D, Windischberger C, Sitte HH, Kasper S, Praschak-Rieder N, Moser E, Brocke B, Pezawas L. Reduced default mode network suppression during a working memory task in remitted major depression. J Psychiatr Res 2015; 64:9-18. [PMID: 25801734 PMCID: PMC4415908 DOI: 10.1016/j.jpsychires.2015.02.025] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 01/14/2015] [Accepted: 02/26/2015] [Indexed: 01/06/2023]
Abstract
Insufficient default mode network (DMN) suppression was linked to increased rumination in symptomatic Major Depressive Disorder (MDD). Since rumination is known to predict relapse and a more severe course of MDD, we hypothesized that similar DMN alterations might also exist during full remission of MDD (rMDD), a condition known to be associated with increased relapse rates specifically in patients with adolescent onset. Within a cross-sectional functional magnetic resonance imaging study activation and functional connectivity (FC) were investigated in 120 adults comprising 78 drug-free rMDD patients with adolescent- (n = 42) and adult-onset (n = 36) as well as 42 healthy controls (HC), while performing the n-back task. Compared to HC, rMDD patients showed diminished DMN deactivation with strongest differences in the anterior-medial prefrontal cortex (amPFC), which was further linked to increased rumination response style. On a brain systems level, rMDD patients showed an increased FC between the amPFC and the dorsolateral prefrontal cortex, which constitutes a key region of the antagonistic working-memory network. Both whole-brain analyses revealed significant differences between adolescent-onset rMDD patients and HC, while adult-onset rMDD patients showed no significant effects. Results of this study demonstrate that reduced DMN suppression exists even after full recovery of depressive symptoms, which appears to be specifically pronounced in adolescent-onset MDD patients. Our results encourage the investigation of DMN suppression as a putative predictor of relapse in clinical trials, which might eventually lead to important implications for antidepressant maintenance treatment.
Collapse
Affiliation(s)
- Lucie Bartova
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Bernhard M. Meyer
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Kersten Diers
- Department of Psychology, Dresden University of Technology, Dresden, Germany
| | - Ulrich Rabl
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Christian Scharinger
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Ana Popovic
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Gerald Pail
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Klaudius Kalcher
- MR Centre of Excellence, Medical University of Vienna, Vienna, Austria,Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Roland N. Boubela
- MR Centre of Excellence, Medical University of Vienna, Vienna, Austria,Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Julia Huemer
- Department of Child and Adolescent Psychiatry, Medical University of Vienna, Vienna, Austria
| | - Dominik Mandorfer
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Christian Windischberger
- MR Centre of Excellence, Medical University of Vienna, Vienna, Austria,Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Harald H. Sitte
- Center of Physiology and Pharmacology, Institute of Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Siegfried Kasper
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Nicole Praschak-Rieder
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | - Ewald Moser
- MR Centre of Excellence, Medical University of Vienna, Vienna, Austria,Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Burkhard Brocke
- Department of Psychology, Dresden University of Technology, Dresden, Germany
| | - Lukas Pezawas
- Division of Biological Psychiatry, Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria.
| |
Collapse
|
7
|
Jin ZL, Gao N, Li XR, Tang Y, Xiong J, Chen HX, Xue R, Li YF. The antidepressant-like pharmacological profile of Yuanzhi-1, a novel serotonin, norepinephrine and dopamine reuptake inhibitor. Eur Neuropsychopharmacol 2015; 25:544-56. [PMID: 25638027 DOI: 10.1016/j.euroneuro.2015.01.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 12/11/2014] [Accepted: 01/09/2015] [Indexed: 10/24/2022]
Abstract
Triple reuptake inhibitors that block dopamine transporters (DATs), norepinephrine transporters (NETs), and serotonin transporters (SERTs) are being developed as a new class of antidepressants that might have better efficacy and fewer side effects than traditional antidepressants. In this study, we performed in vitro binding and uptake assays as well as in vivo behavioural tests to assess the pharmacological properties and antidepressant-like efficacy of Yuanzhi-1. In vitro, Yuanzhi-1 had a high affinity for SERTs, NETs, and DATs prepared from rat brain tissue (Ki=3.95, 4.52 and 0.87nM, respectively) and recombinant cells (Ki=2.87, 6.86 and 1.03nM, respectively). Moreover, Yuanzhi-1 potently inhibited the uptake of serotonin (5-hydroxytryptamine; 5-HT), norepinephrine (NE) and dopamine (DA) into rat brain synaptosomes (Ki=2.12, 4.85 and 1.08nM, respectively) and recombinant cells (Ki=1.65, 5.32 and 0.68nM, respectively). In vivo, Yuanzhi-1 decreased immobility in a dose-dependent manner, which was shown among rats via the forced-swim test (FST) and mice via the tail-suspension test (TST). The results observed in the behavioural tests did not appear to result from the stimulation of locomotor activity. Repeated Yuanzhi-1 treatment (2.5, 5 or 10mg/kg) significantly reversed depression-like behaviours in chronically stressed rats, including reduced sucrose preference, decreased locomotor activity, and prolonged time to begin eating. Furthermore, in vivo microdialysis studies showed that 5- and 10-mg/kg administrations of Yuanzhi-1 significantly increased the extracellular concentrations of 5-HT, NE and DA in the frontal cortices of freely moving rats. Therefore, Yuanzhi-1 might represent a novel triple reuptake inhibitor and possess antidepressant-like activity.
Collapse
Affiliation(s)
- Zeng-liang Jin
- Department of Pharmacology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Nana Gao
- Department of Pharmacology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Xiao-rong Li
- Department of Pharmacology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Yu Tang
- Department of Pharmacology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Jie Xiong
- Department of Pharmacology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, PR China
| | - Hong-xia Chen
- Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China
| | - Rui Xue
- Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China
| | - Yun-Feng Li
- Beijing Institute of Pharmacology and Toxicology, Beijing 100850, PR China.
| |
Collapse
|
8
|
Glutamate transporter 1-mediated antidepressant-like effect in a rat model of chronic unpredictable stress. ACTA ACUST UNITED AC 2014; 34:838-844. [PMID: 25480579 DOI: 10.1007/s11596-014-1362-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Revised: 11/12/2014] [Indexed: 12/12/2022]
Abstract
In recent years, more attention has been paid to the role of the glutamate transporter 1 (GLT-1, EAAT2) in major depressive disorder (MDD). However, experimental data on brain GLT-1 levels are, to some extent, inconsistent in human postmortem and animal studies. These discrepancies imply that the role of GLT-1 in the pathophysiology of MDD and the action of antidepressants remain obscure. This work was designed to study the impact of chronic unpredictable stress (CUS) for 2 sessions per day for 35 days and four weeks of fluoxetine (FLX) on depressive-like behaviors in rats, as well as the concomitant expression of the GLT-1 protein in the hippocampus. Behavioral changes were assessed by the sucrose preference and open field tests. GLT-1 levels were detected by immunohistchemistry and Western blot analysis. Our study demonstrated that the animals exposed to CUS showed depressive-like behaviors and exhibited a significant decrease in GLT-1 expression in the hippocampus. Chronic FLX treatment reversed the behavioral deficits and the CUS-induced decrease in GLT-1 levels. Taken together, our results support the reduction of GLT-1 in human postmortem studies in MDD and suggest that GLT-1 may be involved in the antidepressant activity of FLX. Our studies further support the notion that GLT-1 is an attractive candidate molecule associated with the fundamental processes of MDD and may be a potential, and novel pharmacological target for the treatment of MDD.
Collapse
|
9
|
Huang X, Yu T, Li X, Cao Y, Li X, Liu B, Yang F, Li W, Zhao X, Feng G, Zhang X, Dong Z, He L, Sun X, He G. ABCB6, ABCB1 and ABCG1 genetic polymorphisms and antidepressant response of SSRIs in Chinese depressive patients. Pharmacogenomics 2014; 14:1723-30. [PMID: 24192121 DOI: 10.2217/pgs.13.151] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
AIM Major depressive disorder is a common psychiatric disorder with worldwide prevalence. The most widely prescribed antidepressants are selective serotonin reuptake inhibitors (SSRIs). ATP-binding cassette proteins are responsible for the membrane transport of various molecules including antidepressive drugs. We investigated whether SNPs in ABCB6, ABCB1 and ABCG1 were associated with the treatment response of SSRIs. MATERIALS & METHODS A pharmacogenetic study genotyping nine SNPs was conducted in 290 major depressive disorder patients in the Chinese Han population. Allele and genotype frequencies were compared between responders and nonresponders. RESULTS The allele frequencies of rs28401781 and rs4148739 in ABCB1 showed significant difference between responders and nonresponders before correction (p = 0.0297 and p = 0.0359, respectively). No significant associations were detected for the ABCB6 or ABCG1 gene. CONCLUSION Our results suggest that ABCB1 polymorphisms might be associated with SSRIs treatment response in the Chinese Han population.
Collapse
Affiliation(s)
- Xiaoye Huang
- Bio-X Institutes, Key Laboratory for the Genetics of Developmental & Neuropsychiatric Disorders (Ministry of Education), Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, PR China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Hickie IB, Scott J, Hermens DF, Scott EM, Naismith SL, Guastella AJ, Glozier N, McGorry PD. Clinical classification in mental health at the cross-roads: which direction next? BMC Med 2013; 11:125. [PMID: 23672522 PMCID: PMC3653738 DOI: 10.1186/1741-7015-11-125] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Accepted: 12/18/2012] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND After 30 years of consensus-derived diagnostic categories in mental health, it is time to head in new directions. Those categories placed great emphasis on enhanced reliability and the capacity to identify them via standardized checklists. Although this enhanced epidemiology and health services planning, it failed to link broad diagnostic groupings to underlying pathophysiology or specific treatment response. DISCUSSION It is time to adopt new goals that prioritize the validation of clinical entities and foster alternative strategies to support those goals. The value of new dimensions (notably clinical staging), that are both clinically relevant and directly related to emerging developmental and neurobiological research, is proposed. A strong emphasis on 'reverse translation' (that is, working back from the clinic to the laboratory) underpins these novel approaches. However, it relies on using diagnostic groupings that already have strong evidence of links to specific risk factors or patterns of treatment response. SUMMARY The strategies described abandon the historical divides between clinical neurology, psychiatry and psychology and adopt the promotion of pathways to illness models.
Collapse
Affiliation(s)
- Ian B Hickie
- Clinical Research Unit, Brain & Mind Research Institute, University of Sydney, 100 Mallett Street, Camperdown, 2050, Australia
| | - Jan Scott
- Academic Psychiatry, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
- FondaMental Foundation, Fondation de Coopération Scientifique Hôpital A. Chenevier, 40 Rue de Mesly, Creteil, F-94000, France
- INSERM, U 955, IMRB, Psychiatry Genetic, Creteil, F-94000, France
| | - Daniel F Hermens
- Clinical Research Unit, Brain & Mind Research Institute, University of Sydney, 100 Mallett Street, Camperdown, 2050, Australia
| | - Elizabeth M Scott
- Clinical Research Unit, Brain & Mind Research Institute, University of Sydney, 100 Mallett Street, Camperdown, 2050, Australia
- School of Medicine, The University of Notre Dame, 160 Oxford Street, Darlinghurst, Sydney, 2010, Australia
| | - Sharon L Naismith
- Clinical Research Unit, Brain & Mind Research Institute, University of Sydney, 100 Mallett Street, Camperdown, 2050, Australia
| | - Adam J Guastella
- Clinical Research Unit, Brain & Mind Research Institute, University of Sydney, 100 Mallett Street, Camperdown, 2050, Australia
| | - Nick Glozier
- Clinical Research Unit, Brain & Mind Research Institute, University of Sydney, 100 Mallett Street, Camperdown, 2050, Australia
| | - Patrick D McGorry
- Centre for Youth Mental Health, University of Melbourne, 35 Poplar Road, Parkville, 3052, Australia
- Orygen Youth Health Research Centre, Department of Psychiatry, University of Melbourne, 35 Poplar Road, Parkville, 3052, Australia
| |
Collapse
|
11
|
Abstract
Depression is usually associated with alterations in the monoaminergic system. However, new evidences suggest the involvement of the glutamatergic system in the aetiology of depression. Here we explored the glutamatergic system in a rat model of depression (i.e., the flinders sensitive line (FSL)) to reveal the mechanism underlying the emotional and cognitive aspects associated with the disease. We showed a dramatically elevated level of baseline glutamatergic synaptic transmission by whole-cell recordings as well as impairment in long-term potentiation induced by high-frequency stimulation in hippocampal slices from FSL rats compared with Sprague-Dawley rats. At behavioural level, FSL rats displayed recognition memory impairment in the novel object recognition test. Enantioselective chromatography analysis revealed lower levels of D-serine in the hippocampus of FSL rats and both synaptic plasticity and memory impairments were restored by administration of D-serine. We also observed dysfunctional astrocytic glutamate regulation including downregulation of the glia glutamate transporter GLAST as shown by western blot. One possibility is that the dysfunctional astrocytic glutamate reuptake triggers a succession of events, including the reduction of D-serine production as a safety mechanism to avoid NMDA receptor overactivation, which in turn causes the synaptic plasticity and memory impairments observed. These findings open up new brain targets for the development of more potent and efficient antidepressant drugs.
Collapse
|
12
|
Impairment of synaptic plasticity by the stress mediator CRH involves selective destruction of thin dendritic spines via RhoA signaling. Mol Psychiatry 2013; 18:485-96. [PMID: 22411227 PMCID: PMC3440527 DOI: 10.1038/mp.2012.17] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Stress is ubiquitous in modern life and exerts profound effects on cognitive and emotional functions. Thus, whereas acute stress enhances memory, longer episodes exert negative effects through as yet unresolved mechanisms. We report a novel, hippocampus-intrinsic mechanism for the selective memory defects that are provoked by stress. CRH (corticotropin-releasing hormone), a peptide released from hippocampal neurons during stress, depressed synaptic transmission, blocked activity-induced polymerization of spine actin and impaired synaptic plasticity in adult hippocampal slices. Live, multiphoton imaging demonstrated a selective vulnerability of thin dendritic spines to this stress hormone, resulting in depletion of small, potentiation-ready excitatory synapses. The underlying molecular mechanisms required activation and signaling of the actin-regulating small GTPase, RhoA. These results implicate the selective loss of dendritic spine sub-populations as a novel structural and functional foundation for the clinically important effects of stress on cognitive and emotional processes.
Collapse
|
13
|
Wong ML, Dong C, Andreev V, Arcos-Burgos M, Licinio J. Prediction of susceptibility to major depression by a model of interactions of multiple functional genetic variants and environmental factors. Mol Psychiatry 2012; 17:624-33. [PMID: 22449891 PMCID: PMC3359641 DOI: 10.1038/mp.2012.13] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Major depressive disorder (MDD) is the most common psychiatric disorder and the second overall cause of disability. Even though a significant amount of the variance in the MDD phenotype is explained by inheritance, specific genetic variants conferring susceptibility to MDD explain only a minimal proportion of MDD causality. Moreover, genome-wide association studies have only identified two small-sized effect loci that reach genome-wide significance. In this study, a group of Mexican-American patients with MDD and controls recruited for a pharmacogenetic study were genotyped for nonsynonymous single-nucleotide polymorphisms (nsSNPs) and used to explore the interactions of multiple functional genetic variants with risk-classification tree analysis. The risk-classification tree analysis model and linkage disequilibrium blocks were used to replicate exploratory findings in the database of genotypes and phenotypes (dbGaP) for major depression, and pathway analysis was performed to explore potential biological mechanisms using the branching events. In exploratory analyses, we found that risk-classification tree analysis, using 15 nsSNPs that had a nominal association with MDD diagnosis, identified multiple increased-MDD genotype clusters and significant additive interactions in combinations of genotype variants that were significantly associated with MDD. The results in the dbGaP for major depression disclosed a multidimensional dependent phenotype constituted of MDD plus significant modifiers (smoking, marriage status, age, alcohol abuse/dependence and gender), which then was used for the association tree analysis. The reconstructed tree analysis for the dbGaP data showed robust reliability and replicated most of the genes involved in the branching process found in our exploratory analyses. Pathway analysis using all six major events of branching (PSMD9, HSD3B1, BDNF, GHRHR, PDE6C and PDLIM5) was significant for positive regulation of cellular and biological processes that are relevant to growth and organ development. Our findings not only provide important insights into the biological pathways underlying innate susceptibility to MDD but also offer a predictive framework based on interactions of multiple functional genetic variants and environmental factors. These findings identify novel targets for therapeutics and for translation into preventive, clinical and personalized health care.
Collapse
Affiliation(s)
- M-L Wong
- Department of Translational Medicine, John Curtin School of Medical Research, Australian National University, Canberra, ACT, Australia
| | - C Dong
- Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - V Andreev
- Department of Psychiatry, University of Miami Miller School of Medicine, Miami, FL, USA
| | - M Arcos-Burgos
- Department of Translational Medicine, John Curtin School of Medical Research, Australian National University, Canberra, ACT, Australia
| | - J Licinio
- Department of Translational Medicine, John Curtin School of Medical Research, Australian National University, Canberra, ACT, Australia,Department of Translational Medicine, John Curtin School of Medical Research, Australian National University, Building 131, Garran Road, Canberra, ACT, 2601, Australia. E-mail:
| |
Collapse
|