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Ilex paraguariensis hydroalcoholic extract exerts antidepressant-like and neuroprotective effects: involvement of the NMDA receptor and the l-arginine-NO pathway. Behav Pharmacol 2016; 27:384-92. [DOI: 10.1097/fbp.0000000000000211] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Liu WX, Wang J, Xie ZM, Xu N, Zhang GF, Jia M, Zhou ZQ, Hashimoto K, Yang JJ. Regulation of glutamate transporter 1 via BDNF-TrkB signaling plays a role in the anti-apoptotic and antidepressant effects of ketamine in chronic unpredictable stress model of depression. Psychopharmacology (Berl) 2016; 233:405-15. [PMID: 26514555 DOI: 10.1007/s00213-015-4128-2] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Accepted: 10/12/2015] [Indexed: 01/28/2023]
Abstract
RATIONALE Growing evidence suggests that downregulated clearance of glutamate and signaling pathways involving brain-derived neurotrophic factor (BDNF) and its receptor TrkB play a role in morphological changes in the hippocampus of depressed patients. The N-methyl-D-aspartate (NMDA) receptor antagonist ketamine is the most attractive antidepressant, although precise mechanisms are unknown. OBJECTIVE In this study, we examined whether hippocampal BDNF-TrkB signaling underlies the antidepressant effects of ketamine via upregulating glutamate transporter 1 (GLT-1) in rats, subjected to the chronic unpredictable stress (CUS) for 42 days. The rats received a single injection of ketamine (10 mg/kg, i.p.) and/or a TrkB inhibitor, K252a (1 μl, 2 mM, intracerebroventicular (i.c.v.)) on day 43. Behavioral tests and brain sample collection were evaluated 24 h later. RESULTS The CUS-exposed rats exhibited depression- and anxiety-like behaviors; decreased number of glial fibrillary acidic protein (GFAP)-positive (but not NeuN-positive) cells in the dentate gyrus (DG), CA1, and CA3 areas; increased number of cleaved caspase-3-positive astrocytes; reduced spine density; lower ratio of Bcl2 to Bax; and decreased levels of BDNF, phosphorylated cAMP response element binging protein (CREB), GLT-1, and postsynaptic density 95 (PSD95) proteins in the hippocampus. Ketamine alleviated the CUS-induced abnormalities. The effects of ketamine were antagonized by pretreatment with K252a. CONCLUSIONS Our findings suggest that regulation of GLT-1 on astrocytes, responsible for 90 % of glutamate reuptake from the synapse, through BDNF-TrkB signaling is involved in mediation of the therapeutic effects of ketamine on behavioral abnormalities and morphological changes in the hippocampus of the CUS-exposed rats.
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Affiliation(s)
- Wen-Xue Liu
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jing Wang
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Ze-Min Xie
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China
- Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou, China
| | - Ning Xu
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China
- Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou, China
| | - Guang-Fen Zhang
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Min Jia
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Zhi-Qiang Zhou
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Kenji Hashimoto
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
| | - Jian-Jun Yang
- Department of Anesthesiology, Jinling Hospital, Medical School of Nanjing University, Nanjing, China.
- Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China.
- Jiangsu Province Key Laboratory of Anesthesia and Analgesia Application Technology, Xuzhou, China.
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Peterlik D, Flor PJ, Uschold-Schmidt N. The Emerging Role of Metabotropic Glutamate Receptors in the Pathophysiology of Chronic Stress-Related Disorders. Curr Neuropharmacol 2016; 14:514-39. [PMID: 27296643 PMCID: PMC4983752 DOI: 10.2174/1570159x13666150515234920] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Revised: 04/04/2015] [Accepted: 05/12/2015] [Indexed: 12/28/2022] Open
Abstract
Chronic stress-related psychiatric conditions such as anxiety, depression, and alcohol abuse are an enormous public health concern. The etiology of these pathologies is complex, with psychosocial stressors being among the most frequently discussed risk factors. The brain glutamatergic neurotransmitter system has often been found involved in behaviors and pathophysiologies resulting from acute stress and fear. Despite this, relatively little is known about the role of glutamatergic system components in chronic psychosocial stress, neither in rodents nor in humans. Recently, drug discovery efforts at the metabotropic receptor subtypes of the glutamatergic system (mGlu1-8 receptors) led to the identification of pharmacological tools with emerging potential in psychiatric conditions. But again, the contribution of individual mGlu subtypes to the manifestation of physiological, molecular, and behavioral consequences of chronic psychosocial stress remains still largely unaddressed. The current review will describe animal models typically used to analyze acute and particularly chronic stress conditions, including models of psychosocial stress, and there we will discuss the emerging roles for mGlu receptor subtypes. Indeed, accumulating evidence indicates relevance and potential therapeutic usefulness of mGlu2/3 ligands and mGlu5 receptor antagonists in chronic stress-related disorders. In addition, a role for further mechanisms, e.g. mGlu7-selective compounds, is beginning to emerge. These mechanisms are important to be analyzed in chronic psychosocial stress paradigms, e.g. in the chronic subordinate colony housing (CSC) model. We summarize the early results and discuss necessary future investigations, especially for mGlu5 and mGlu7 receptor blockers, which might serve to suggest improved therapeutic strategies to treat stress-related disorders.
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Affiliation(s)
| | - Peter J Flor
- Faculty of Biology and Preclinical Medicine, University of Regensburg, D-93053 Regensburg, Germany.
| | - Nicole Uschold-Schmidt
- Faculty of Biology and Preclinical Medicine, University of Regensburg, D-93053 Regensburg, Germany.
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Zhang JC, Wu J, Fujita Y, Yao W, Ren Q, Yang C, Li SX, Shirayama Y, Hashimoto K. Antidepressant effects of TrkB ligands on depression-like behavior and dendritic changes in mice after inflammation. Int J Neuropsychopharmacol 2015; 18:pyu077. [PMID: 25628381 PMCID: PMC4360225 DOI: 10.1093/ijnp/pyu077] [Citation(s) in RCA: 167] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Brain-derived neurotrophic factor (BDNF) and its receptor, tropomyosin-related kinase B (TrkB), signaling represent potential therapeutic targets for major depressive disorder. The purpose of this study is to examine whether TrkB ligands show antidepressant effects in an inflammation-induced model of depression. METHODS In this study, we examined the effects of TrkB agonist 7,8-dihydroxyflavone (7,8-DHF) and TrkB antagonist ANA-12 on depression-like behavior and morphological changes in mice previously exposed to lipopolysaccharide (LPS). Protein levels of BDNF, phospho-TrkB (p-TrkB), and TrkB in the brain regions were also examined. RESULTS LPS caused a reduction of BDNF in the CA3 and dentate gyrus (DG) of the hippocampus and prefrontal cortex (PFC), whereas LPS increased BDNF in the nucleus accumbens (NAc). Dexamethason suppression tests showed hyperactivity of the hypothalamic-pituitary-adrenal axis in LPS-treated mice. Intraperitoneal (i.p.) administration of 7,8-DHF showed antidepressant effects on LPS-induced depression-like behavior, and i.p. pretreatment with ANA-12 blocked its antidepressant effects. Surprisingly, ANA-12 alone showed antidepressant-like effects on LPS-induced depression-like behavior. Furthermore, bilateral infusion of ANA-12 into the NAc showed antidepressant effects. Moreover, LPS caused a reduction of spine density in the CA3, DG, and PFC, whereas LPS increased spine density in the NAc. Interestingly, 7,8-DHF significantly attenuated LPS-induced reduction of p-TrkB and spine densities in the CA3, DG, and PFC, whereas ANA-12 significantly attenuated LPS-induced increases of p-TrkB and spine density in the NAc. CONCLUSIONS The results suggest that LPS-induced inflammation may cause depression-like behavior by altering BDNF and spine density in the CA3, DG, PFC, and NAc, which may be involved in the antidepressant effects of 7,8-DHF and ANA-12, respectively.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Kenji Hashimoto
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan (Drs Zhang, Wu, Yao, Ren, Yang, Li, Shirayama, Hashimoto, and Ms Fujita); National Institute of Drug Dependence, Peking University, Beijing, China (Dr Li); Department of Psychiatry, Teikyo University Chiba Medical Center, Chiba, Japan (Dr Shirayama).
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Li SX, Zhang JC, Wu J, Hashimoto K. Antidepressant Effects of Ketamine on Depression-like Behavior in Juvenile Mice after Neonatal Dexamethasone Exposure. CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE 2014; 12:124-7. [PMID: 25191502 PMCID: PMC4153858 DOI: 10.9758/cpn.2014.12.2.124] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 02/01/2014] [Accepted: 02/14/2014] [Indexed: 11/29/2022]
Abstract
Objective Pediatric depression is associated with significant functional impairment at school and at work. Recently, we reported on depression-like behavior in juvenile mice neonatally exposed to dexamethasone (DEX) as a potential animal model for pediatric depression. The N-methyl-D-aspartate (NMDA) receptor antagonist ketamine has promoted rapid and long-lasting antidepressant effects in patients with treatment-resistant major depression. This study was conducted to examine whether ketamine had antidepressant effects in juvenile mice after neonatal DEX exposure. Methods A single dose (10 mg/kg) of ketamine or vehicle was injected into juvenile mice at days 29-32 after neonatal DEX (or saline) exposure (days 1-3). The sucrose preference test, tail suspension test, and forced swimming test were performed 24, 40, and 46 hours, respectively, after injection of ketamine. Results Ketamine (10 mg/kg) significantly improved depression-like behavior in DEX-treated juvenile mice. Conclusion This finding suggests that ketamine confers antidepressant effects in an animal model of pediatric depression.
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Affiliation(s)
- Su-Xia Li
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan. ; National Institute on Drug Dependence, Peking University, Beijing, P.R. China
| | - Ji-Chun Zhang
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan
| | - Jin Wu
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan
| | - Kenji Hashimoto
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan
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Hashimoto K. The R-Stereoisomer of Ketamine as an Alternative for Ketamine for Treatment-resistant Major Depression. CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE 2014; 12:72-3. [PMID: 24851126 PMCID: PMC4022771 DOI: 10.9758/cpn.2014.12.1.72] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 11/27/2013] [Indexed: 11/18/2022]
Affiliation(s)
- Kenji Hashimoto
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan
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Zhang JC, Li SX, Hashimoto K. R (-)-ketamine shows greater potency and longer lasting antidepressant effects than S (+)-ketamine. Pharmacol Biochem Behav 2013; 116:137-41. [PMID: 24316345 DOI: 10.1016/j.pbb.2013.11.033] [Citation(s) in RCA: 249] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2013] [Revised: 11/18/2013] [Accepted: 11/23/2013] [Indexed: 12/18/2022]
Abstract
The N-methyl-D-aspartate (NMDA) receptor antagonist ketamine is one of the most attractive antidepressants for treatment-resistant major depressive disorder (MDD). Ketamine (or RS (±)-ketamine) is a racemic mixture containing equal parts of R (-)-ketamine and S (+)-ketamine. In this study, we examined the effects of R- and S-ketamine on depression-like behavior in juvenile mice after neonatal dexamethasone (DEX) exposure. In the tail suspension test (TST) and forced swimming test (FST), both isomers of ketamine significantly attenuated the increase in immobility time, seen in DEX-treated juvenile mice at 27 and 29 h respectively, after ketamine injections. In the 1% sucrose preference test (SPT), both isomers significantly attenuated the reduced preference for 1% sucrose consumption in DEX-treated juvenile mice, 48 h after a ketamine injection. Interestingly, when immobility times were tested by the TST and FST at day 7, R-ketamine, but not S-ketamine, significantly lowered the increases in immobility seen in DEX-treated juvenile mice. This study shows that a single dose of R-ketamine produced rapid and long-lasting antidepressant effects in juvenile mice exposed neonatally to DEX. Therefore, R-ketamine appears to be a potent and safe antidepressant relative to S-ketamine, since R-ketamine may be free of psychotomimetic side effects.
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Affiliation(s)
- Ji-Chun Zhang
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan
| | - Su-Xia Li
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan; National Institute on Drug Dependence, Peking University, Beijing, PR China
| | - Kenji Hashimoto
- Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, Japan.
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