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Sun W, Mei Y, Li X, Yang Y, An L. Maternal immune activation-induced proBDNF-mediated neural information processing dysfunction at hippocampal CA3-CA1 synapses associated with memory deficits in offspring. Front Cell Dev Biol 2022; 10:1018586. [PMID: 36438556 PMCID: PMC9691851 DOI: 10.3389/fcell.2022.1018586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 10/27/2022] [Indexed: 11/07/2023] Open
Abstract
Prenatal exposure to maternal infection increases the risk of offspring developing schizophrenia in adulthood. Current theories suggest that the consequences of MIA on mBDNF secretion may underlie the increased risk of cognitive disorder. There is little evidence for whether the expression of its precursor, proBDNF, is changed and how proBDNF-mediated signaling may involve in learning and memory. In this study, proBDNF levels were detected in the hippocampal CA1 and CA3 regions of male adult rats following MIA by prenatal polyI:C exposure. Behaviorally, learning and memory were assessed in contextual fear conditioning tasks. Local field potentials were recorded in the hippocampal CA3-CA1 pathway. The General Partial Directed Coherence approach was utilized to identify the directional alternation of neural information flow between CA3 and CA1 regions. EPSCs were recorded in CA1 pyramidal neurons to explore a possible mechanism involving the proBDNF-p75NTR signaling pathway. Results showed that the expression of proBDNF in the polyI:C-treated offspring was abnormally enhanced in both CA3 and CA1 regions. Meanwhile, the mBDNF expression was reduced in both hippocampal regions. Intra-hippocampal CA1 but not CA3 injection with anti-proBDNF antibody and p75NTR inhibitor TAT-Pep5 effectively mitigated the contextual memory deficits. Meanwhile, reductions in the phase synchronization between CA3 and CA1 and the coupling directional indexes from CA3 to CA1 were enhanced by the intra-CA1 infusions. Moreover, blocking proBDNF/p75NTR signaling could reverse the declined amplitude of EPSCs in CA1 pyramidal neurons, indicating the changes in postsynaptic information processing in the polyI:C-treated offspring. Therefore, the changes in hippocampal proBDNF activity in prenatal polyI:C exposure represent a potential mechanism involved in NIF disruption leading to contextual memory impairments.
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Affiliation(s)
- Wei Sun
- Department of Pediatric, The First Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, China
- Behavioral Neuroscience Laboratory, The First Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, China
| | - Yazi Mei
- Graduate School, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Xiaoliang Li
- Department of Neurology, Jinan Geriatric/Rehabilitation Hospital, Jinan, China
| | - Yang Yang
- Department of Pediatric, The First Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, China
| | - Lei An
- Department of Pediatric, The First Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, China
- Behavioral Neuroscience Laboratory, The First Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, China
- Department of Neurology, Jinan Geriatric/Rehabilitation Hospital, Jinan, China
- Department of Neurology, The First Affiliated Hospital, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou, China
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Tamura H, Shiosaka S, Morikawa S. Trophic modulation of gamma oscillations: The key role of processing protease for Neuregulin-1 and BDNF precursors. Neurochem Int 2018; 119:2-10. [DOI: 10.1016/j.neuint.2017.12.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 11/11/2017] [Accepted: 12/08/2017] [Indexed: 12/26/2022]
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Jones NC, Hudson M, Foreman J, Rind G, Hill R, Manning EE, Buuse M. Brain‐derived neurotrophic factor haploinsufficiency impairs high‐frequency cortical oscillations in mice. Eur J Neurosci 2017; 48:2816-2825. [DOI: 10.1111/ejn.13722] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 08/30/2017] [Accepted: 09/13/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Nigel C. Jones
- Department of Medicine Melbourne Brain Centre Royal Melbourne Hospital University of Melbourne Parkville Vic. 3052 Australia
- Department of Neuroscience Central Clinical School Monash University Melbourne Vic. Australia
- Department of Neurology The Alfred Hospital Melbourne Vic. Australia
| | - Matthew Hudson
- Department of Medicine Melbourne Brain Centre Royal Melbourne Hospital University of Melbourne Parkville Vic. 3052 Australia
| | - Joshua Foreman
- Department of Medicine Melbourne Brain Centre Royal Melbourne Hospital University of Melbourne Parkville Vic. 3052 Australia
| | - Gil Rind
- Department of Medicine Melbourne Brain Centre Royal Melbourne Hospital University of Melbourne Parkville Vic. 3052 Australia
| | - Rachel Hill
- Department of Psychiatry Monash University Melbourne Vic. Australia
- Melbourne Brain Centre Florey Institutes of Neuroscience and Mental Health University of Melbourne Parkville Vic. Australia
| | - Elizabeth E. Manning
- Melbourne Brain Centre Florey Institutes of Neuroscience and Mental Health University of Melbourne Parkville Vic. Australia
| | - Maarten Buuse
- Melbourne Brain Centre Florey Institutes of Neuroscience and Mental Health University of Melbourne Parkville Vic. Australia
- School of Psychology and Public Health La Trobe University Melbourne Vic. Australia
- Department of Pharmacology University of Melbourne Melbourne Vic. Australia
- The College of Public Health, Medical and Veterinary Sciences James Cook University Townsville QLD Australia
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Kantor S, Varga J, Kulkarni S, Morton AJ. Chronic Paroxetine Treatment Prevents the Emergence of Abnormal Electroencephalogram Oscillations in Huntington's Disease Mice. Neurotherapeutics 2017; 14:1120-1133. [PMID: 28653279 PMCID: PMC5722757 DOI: 10.1007/s13311-017-0546-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Disturbance of rapid eye movement (REM) sleep appears early in both patients with Huntington's disease (HD) and mouse models of HD. Selective serotonin reuptake inhibitors are widely prescribed for patients with HD, and are also known to suppress REM sleep in healthy subjects. To test whether selective serotonin reuptake inhibitors can correct abnormal REM sleep and sleep-dependent brain oscillations in HD mice, we treated wild-type and symptomatic R6/2 mice acutely with vehicle and paroxetine (5, 10, and 20 mg/kg). In addition, we treated a group of R6/2 mice chronically with vehicle or paroxetine (20 mg/kg/day) for 8 weeks, with treatment starting before the onset of overt motor symptoms. During and after treatment, we recorded electroencephalogram/electromyogram from the mice. We found that both acute and chronic paroxetine treatment normalized REM sleep in R6/2 mice. However, only chronic paroxetine treatment prevented the emergence of abnormal low-gamma (25-45 Hz) electroencephalogram oscillations in R6/2 mice, an effect that persisted for at least 2 weeks after treatment stopped. Chronic paroxetine treatment also normalized REM sleep theta rhythm in R6/2 mice, but, interestingly, this effect was restricted to the treatment period. By contrast, acute paroxetine treatment slowed REM sleep theta rhythm in WT mice but had no effect on abnormal theta or low-gamma oscillations in R6/2 mice. Our data show that paroxetine treatment, when initiated before the onset of symptoms, corrects both REM sleep disturbances and abnormal brain oscillations, suggesting a possible mechanistic link between early disruption of REM sleep and the subsequent abnormal brain activity in HD mice.
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Affiliation(s)
- Sandor Kantor
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - Janos Varga
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - Shreya Kulkarni
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK
| | - A Jennifer Morton
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK.
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Geist PA, Dulka BN, Barnes A, Totty M, Datta S. RETRACTED: BNDF heterozygosity is associated with memory deficits and alterations in cortical and hippocampal EEG power. Behav Brain Res 2017; 332:154-163. [PMID: 28576309 PMCID: PMC5534188 DOI: 10.1016/j.bbr.2017.05.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/02/2017] [Accepted: 05/11/2017] [Indexed: 12/31/2022]
Abstract
This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal). This article has been retracted at the request of the Editor-in-Chief, the Corresponding Author and the Institutional Research Integrity office at the University of Tennessee due to data mis-management of the project, including inappropriate removal of animals from analyses and use of unapproved euthanasia.
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Affiliation(s)
- Phillip A Geist
- Department of Anesthesiology, Graduate School of Medicine, The University of Tennessee, 1924 Alcoa Highway, Knoxville, TN 37920, United States
| | - Brooke N Dulka
- Department of Psychology, College of Arts and Sciences, 1404 Circle Drive, United States
| | - Abigail Barnes
- Department of Anesthesiology, Graduate School of Medicine, The University of Tennessee, 1924 Alcoa Highway, Knoxville, TN 37920, United States; Department of Psychology, College of Arts and Sciences, 1404 Circle Drive, United States
| | - Michael Totty
- Department of Anesthesiology, Graduate School of Medicine, The University of Tennessee, 1924 Alcoa Highway, Knoxville, TN 37920, United States
| | - Subimal Datta
- Department of Anesthesiology, Graduate School of Medicine, The University of Tennessee, 1924 Alcoa Highway, Knoxville, TN 37920, United States; Department of Psychology, College of Arts and Sciences, 1404 Circle Drive, United States; Program in Comparative and Experimental Medicine, 2407 River Drive, RM A102, The University of Tennessee, Knoxville, TN 37996, United States.
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Perreault ML, Fan T, Banasikowski TJ, Grace AA, George SR. The atypical dopamine receptor agonist SKF 83959 enhances hippocampal and prefrontal cortical neuronal network activity in a rat model of cognitive dysfunction. Eur J Neurosci 2017; 46:2015-2025. [PMID: 28677227 DOI: 10.1111/ejn.13635] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 06/23/2017] [Accepted: 06/25/2017] [Indexed: 12/11/2022]
Abstract
Deficits in neuronal network synchrony in hippocampus and prefrontal cortex have been widely demonstrated in disorders of cognitive dysfunction, including schizophrenia and Alzheimer's disease. The atypical dopamine agonist SKF 83959 has been shown to increase brain-derived neurotrophic factor signalling and suppress activity of glycogen synthase kinase-3 in PFC, two processes important to learning and memory. The purpose of this study was to therefore evaluate the impact of SKF 83959 on oscillatory deficits in methylazoxymethanol acetate (MAM) rat model of schizophrenia. To achieve this, local field potentials were recorded simultaneously from the hippocampus and prefrontal cortex of anesthetized rats at 15 and 90 min following both acute and repeated administration of SKF 83959 (0.4 mg/kg). In MAM rats, but not controls, repeated SKF 83959 treatment increased signal amplitude in hippocampus and enhanced the spectral power of low frequency delta and theta oscillations in this region. In PFC, SKF 83959 increased delta, theta and gamma spectral power. Increased HIP-PFC theta coherence was also evident following acute and repeated SKF 83959. In apparent contradiction to these oscillatory effects, in MAM rats, SKF 83959 inhibited spatial learning and induced a significant increase in thigmotactic behaviour. These findings have uncovered a previously unknown role for SKF 83959 in the positive regulation of hippocampal-prefrontal cortical oscillatory network activity. As SKF 83959 is known to have affinity for a number of receptors, delineating the receptor mechanisms that mediate the positive drug effects on neuronal oscillations could have significant future implications in disorders associated with cognitive dysfunction.
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Affiliation(s)
- Melissa L Perreault
- Department of Pharmacology and Toxicology, University of Toronto, Medical Sciences Bldg. Room 4358, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada
| | - Theresa Fan
- Department of Pharmacology and Toxicology, University of Toronto, Medical Sciences Bldg. Room 4358, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada
| | - Tomek J Banasikowski
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Anthony A Grace
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Susan R George
- Department of Pharmacology and Toxicology, University of Toronto, Medical Sciences Bldg. Room 4358, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada.,Department of Medicine, University of Toronto, Toronto, ON, Canada
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Foltran RB, Diaz SL. BDNF isoforms: a round trip ticket between neurogenesis and serotonin? J Neurochem 2016; 138:204-21. [PMID: 27167299 DOI: 10.1111/jnc.13658] [Citation(s) in RCA: 121] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 04/08/2016] [Accepted: 05/02/2016] [Indexed: 12/12/2022]
Abstract
The brain-derived neurotrophic factor, BDNF, was discovered more than 30 years ago and, like other members of the neurotrophin family, this neuropeptide is synthetized as a proneurotrophin, the pro-BDNF, which is further cleaved to yield mature BDNF. The myriad of actions of these two BDNF isoforms in the central nervous system is constantly increasing and requires the development of sophisticated tools and animal models to refine our understanding. This review is focused on BDNF isoforms, their participation in the process of neurogenesis taking place in the hippocampus of adult mammals, and the modulation of their expression by serotonergic agents. Interestingly, around this triumvirate of BDNF, serotonin, and neurogenesis, a series of recent research has emerged with apparently counterintuitive results. This calls for an exhaustive analysis of the data published so far and encourages thorough work in the quest for new hypotheses in the field. BDNF is synthetized as a pre-proneurotrophin. After removal of the pre-region, proBDNF can be cleaved by intracellular or extracellular proteases. Mature BDNF can bind TrkB receptors, promoting their homodimerization and intracellular phosphorylation. Phosphorylated-TrkB can activate three different signaling pathways. Whereas G-protein-coupled receptors can transactivate TrkB receptors, truncated forms can inhibit mBDNF signaling. Pro-BDNF binds p75(NTR) by its mature domain, whereas the pro-region binds co-receptors.
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Affiliation(s)
- Rocío Beatriz Foltran
- Instituto de Biología Celular y Neurociencias Prof. E. De Robertis, CONICET-UBA, Fac. de Medicina - UBA, Buenos Aires, Argentina
| | - Silvina Laura Diaz
- Instituto de Biología Celular y Neurociencias Prof. E. De Robertis, CONICET-UBA, Fac. de Medicina - UBA, Buenos Aires, Argentina
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Tikka SK, Nizamie SH, Das AK, Agarwal N, Goyal N. Schneiderian first rank symptoms in schizophrenia: A developmental neuroscience evaluation. Int J Dev Neurosci 2016; 50:39-46. [PMID: 26952695 DOI: 10.1016/j.ijdevneu.2016.02.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Revised: 02/03/2016] [Accepted: 02/15/2016] [Indexed: 12/11/2022] Open
Abstract
INTRODUCTION Self disorders in schizophrenia have been suggested to have distinct neurobiological underpinnings. Using comprehensive neuro-scientific assessments including a neurophysiological, a neurochemical and a neuropsychological marker, this study assesses disordered-"self" in schizophrenia. METHODS Twenty schizophrenia patients with first rank symptoms (FRS;FRS+), 20 patients without FRS (FRS-) and 20 healthy controls (HC) were assessed for psychopathology, especially on specially designed FRS score sheets with a narrow and a broad definition. Resting state electroencephalography was acquired using 256-electrodes; gamma spectral-power was measured in 8 regions of interest. Serum BDNF and self-monitoring were also assessed. Comparative and correlation analysis were conducted in addition to a step-wise discriminant function analysis. RESULTS FRS+ group with greater positive symptom score and a lower negative symptom score, showed significantly increased gamma spectral power, especially on right hemispheric regions, along with lower BDNF levels and lower scores on self-monitoring compared to FRS- and HC. Serum BDNF levels and gamma spectral power in the region corresponding right inferior parietal lobule were identified as predictors that most accurately classified the defined groups. CONCLUSIONS Schizophrenia patients satisfying the criteria of presence of first rank symptoms represent a distinct neurodevelopmental subgroup with associated features of predominantly positive symptoms, significantly lower neurotrophin levels, aberrant resting state brain activity in the heteromodal association cortex and performing poorer on self-monitoring tasks.
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Affiliation(s)
- Sai Krishna Tikka
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi 834006, Jharkhand, India.
| | - S Haque Nizamie
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi 834006, Jharkhand, India
| | - Archana Kumari Das
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi 834006, Jharkhand, India
| | - Nidhi Agarwal
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi 834006, Jharkhand, India
| | - Nishant Goyal
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi 834006, Jharkhand, India
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Feng P, Akladious AA, Hu Y, Raslan Y, Feng J, Smith PJ. 7,8-Dihydroxyflavone reduces sleep during dark phase and suppresses orexin A but not orexin B in mice. J Psychiatr Res 2015; 69:110-9. [PMID: 26343602 DOI: 10.1016/j.jpsychires.2015.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 06/22/2015] [Accepted: 08/03/2015] [Indexed: 12/22/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) binds to Tropomyosin-receptor-kinase B (TrkB) receptors that regulate synaptic strength and plasticity in the mammalian nervous system. 7,8-Dihydroxyflavone (DHF) is a recently identified small molecule Trk B agonist that has been reported to ameliorate depression, attenuate the fear response, improve memory consolidation, and exert neuroprotective effects. Poor and disturbed sleep remains a symptom of major depressive disorder and most current antidepressants affect sleep. Therefore, we conducted sleep/wake recordings and concomitant measurement of brain orexins, endogenous peptides that suppress sleep, in mice for this study. Baseline polysomnograph recording was performed for 24 h followed by treatment with either 5 mg/kg of DHF or vehicle at the beginning of the dark phase. Animals were sacrificed the following day, one hour after the final treatment with DHF. Orexin A and B were quantified using ELISA and radioimmunoassay, respectively. Total sleep was significantly decreased in the DHF group, 4 h after drug administration in the dark phase, when compared with vehicle-treated animals. This difference was due to a significant decrease of non-rapid eye movement sleep, but not rapid eye movement sleep. DHF increased power of alpha and sigma bands but suppressed power of gamma band during sleep in dark phase. Interestingly, hypothalamic levels of orexin A were also significantly decreased in the DHF group (97 pg/mg) when compared with the vehicle-treated group (132 pg/mg). However, no significant differences of orexin B were observed between groups. Additionally, no change was found in immobility tests.
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Affiliation(s)
- Pingfu Feng
- Louis Stokes Cleveland DVA Medical Center, USA; Division of Pulmonary, Critical Care and Sleep Medicine, Case Western Reserve University, Cleveland, OH, USA.
| | | | - Yufen Hu
- Louis Stokes Cleveland DVA Medical Center, USA; Division of Pulmonary, Critical Care and Sleep Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - Yousef Raslan
- Louis Stokes Cleveland DVA Medical Center, USA; Division of Pulmonary, Critical Care and Sleep Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - James Feng
- Louis Stokes Cleveland DVA Medical Center, USA
| | - Phillip J Smith
- Division of Pulmonary, Critical Care and Sleep Medicine, Case Western Reserve University, Cleveland, OH, USA
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Tikka SK, Yadav S, Nizamie SH, Das B, Goyal N, Tikka DL. Sporadic and familial subgroups of schizophrenia do not differ on dense array spontaneous gamma oscillatory activity. Psychiatry Res 2014; 220:1151-4. [PMID: 25223257 DOI: 10.1016/j.psychres.2014.08.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2013] [Revised: 08/17/2014] [Accepted: 08/24/2014] [Indexed: 12/18/2022]
Abstract
Genetic variations and developmental insults independently have been proposed to underlie aberrant gamma activity in schizophrenia. We investigated differences in spectral power in gamma (30-100Hz) frequency in patients with familial and sporadic schizophrenia. Subjects underwent resting-awake EEG recording on 192 channels. The two patient subgroups did not significantly differ in any of the gamma bands and regions. We conclude that complex gene-environment interactions are responsible for the limited power of familial-sporadic distinction in schizophrenia.
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Affiliation(s)
- Sai Krishna Tikka
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India.
| | - Shailly Yadav
- Department of Geriatric Mental Health, King George׳s Medical University, Lucknow, Uttar Pradesh, India
| | - S Haque Nizamie
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India
| | - Basudeb Das
- Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand, India
| | - Nishant Goyal
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India
| | - Deyashini Lahiri Tikka
- Department of Clinical Psychology, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand, India
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Tikka SK, Nizamie SH, Goyal N, Pradhan N, Tikka DL, Katshu MZUH. Evaluation of spontaneous dense array gamma oscillatory activity and minor physical anomalies as a composite neurodevelopmental endophenotype in schizophrenia. Int J Dev Neurosci 2014; 40:43-51. [PMID: 25450528 DOI: 10.1016/j.ijdevneu.2014.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 10/14/2014] [Accepted: 11/09/2014] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE Minor physical anomalies (MPAs) and gamma oscillatory activity have been proposed as associated endophenotypes in schizophrenia. Combining these endophenotypes to create a composite endophenotype may help identify those at risk for schizophrenia better. The present study aims to investigate MPAs and gamma oscillatory activity in schizophrenia patients, their unaffected first degree relatives and healthy controls and appreciate whether they can be used together as a composite endophenotype. METHODS This was a cross sectional family study conducted at a tertiary care mental health setup. Ninety participants including schizophrenia patients, their first degree relatives and controls (thirty each) were assessed for MPAs on the Extended Waldrop Scale. All participants underwent an awake, resting 192-channel EEG recording. Spectral power and coherence in 30-100Hz gamma bands were estimated using Welch's averaged periodogram method. One-way ANOVA, chi square test were used for comparing socio-demographic-clinical variables. MANOVA supplemented by one-way ANOVAs (post hoc Tukey HSD) were done for comparison of spectral measures. Pearson's correlation, step-by-step linear discriminant functional and intra-familial correlation analysis were subsequently performed. RESULTS An endophenotype pattern of finding was found for MPAs in the craniofacial region, the total number of MPAs, spectral power in right temporal region on all bands and in the right parietal region in 50-70Hz and 70-100Hz gamma bands. The three groups were most accurately classified when MPA total score, right temporal 30-50Hz gamma power and right occipital 'intra hemispheric' 50-70Hz gamma coherence were considered together than when considered independently. Significant intra familial correlation was seen for MPA total score and right temporal gamma 30-50Hz power. CONCLUSION Composite evaluation of two developmentally linked markers i.e. MPAs and gamma spectral measures may prove useful in categorizing schizophrenia and identifying at-risk individuals.
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Affiliation(s)
- Sai Krishna Tikka
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India.
| | - S Haque Nizamie
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India
| | - Nishant Goyal
- KS Mani Center for Cognitive Neurosciences and Department of Psychiatry, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India
| | - N Pradhan
- Department of Psychopharmacology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka 560029, India
| | - Deyashini Lahiri Tikka
- Department of Clinical Psychology, Central Institute of Psychiatry, Kanke, Ranchi, Jharkhand 834006, India
| | - Mohammad Zia Ul Haq Katshu
- Division of Psychiatry and Applied Psychology, School of Medicine, University of Nottingham, NG7 2TU, United Kingdom
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Hothersall JD, Moffat C, Connolly CN. Prolonged inhibition of 5-HT₃ receptors by palonosetron results from surface receptor inhibition rather than inducing receptor internalization. Br J Pharmacol 2014; 169:1252-62. [PMID: 23581504 PMCID: PMC3831706 DOI: 10.1111/bph.12204] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 01/21/2013] [Accepted: 03/05/2013] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND AND PURPOSE The 5-HT₃ receptor antagonist palonosetron is an important treatment for emesis and nausea during cancer therapy. Its clinical efficacy may result from its unique binding and clearance characteristics and receptor down-regulation mechanisms. We investigated the mechanisms by which palonosetron exerts its long-term inhibition of 5-HT₃ receptors for a better understanding of its clinical efficacy. EXPERIMENTAL APPROACH Cell surface receptors (recombinantly expressed 5HT₃A or 5HT₃AB in COS-7 cells) were monitored using [³H]granisetron binding and ELISA after exposure to palonosetron. Receptor endocytosis was investigated using immunofluorescence microscopy. KEY RESULTS Chronic exposure to palonosetron reduced the number of available cell surface [³H]granisetron binding sites. This down-regulation was not sensitive to either low temperature or pharmacological inhibitors of endocytosis (dynasore or nystatin) suggesting that internalization did not play a role. This was corroborated by our observation that there was no change in cell surface 5-HT₃ receptor levels or increase in endocytic rate. Palonosetron exhibited slow dissociation from the receptor over many hours, with a significant proportion of binding sites being occupied for at least 4 days. Furthermore, our observations suggest that chronic receptor down-regulation involved interactions with an allosteric binding site. CONCLUSIONS AND IMPLICATIONS Palonosetron acts as a pseudo-irreversible antagonist causing prolonged inhibition of 5-HT₃ receptors due to its very slow dissociation. In addition, an irreversible binding mode persists for at least 4 days. Allosteric receptor interactions appear to play a role in this phenomenon.
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Affiliation(s)
- J Daniel Hothersall
- Division of Neuroscience, Medical Research Institute, Ninewells Medical School, University of Dundee, Dundee, UK
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BDNF-based synaptic repair as a disease-modifying strategy for neurodegenerative diseases. Nat Rev Neurosci 2013; 14:401-16. [PMID: 23674053 DOI: 10.1038/nrn3505] [Citation(s) in RCA: 527] [Impact Index Per Article: 47.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Increasing evidence suggests that synaptic dysfunction is a key pathophysiological hallmark in neurodegenerative disorders, including Alzheimer's disease. Understanding the role of brain-derived neurotrophic factor (BDNF) in synaptic plasticity and synaptogenesis, the impact of the BDNF Val66Met polymorphism in Alzheimer's disease-relevant endophenotypes - including episodic memory and hippocampal volume - and the technological progress in measuring synaptic changes in humans all pave the way for a 'synaptic repair' therapy for neurodegenerative diseases that targets pathophysiology rather than pathogenesis. This article reviews the key issues in translating BDNF biology into synaptic repair therapies.
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