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Liu J, Guo H, Yang J, Xiao Y, Cai A, Zhao T, Womer FY, Zhao P, Zheng J, Zhang X, Wang J, Zhu R, Wang F. Visual cortex repetitive transcranial magnetic stimulation (rTMS) reversing neurodevelopmental impairments in adolescents with major psychiatric disorders (MPDs): A cross-species translational study. CNS Neurosci Ther 2024; 30:e14427. [PMID: 37721197 PMCID: PMC10915985 DOI: 10.1111/cns.14427] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 07/21/2023] [Accepted: 08/04/2023] [Indexed: 09/19/2023] Open
Abstract
AIMS Neurodevelopmental impairments are closely linked to the basis of adolescent major psychiatric disorders (MPDs). The visual cortex can regulate neuroplasticity throughout the brain during critical periods of neurodevelopment, which may provide a promising target for neuromodulation therapy. This cross-species translational study examined the effects of visual cortex repetitive transcranial magnetic stimulation (rTMS) on neurodevelopmental impairments in MPDs. METHODS Visual cortex rTMS was performed in both adolescent methylazoxymethanol acetate (MAM) rats and patients with MPDs. Functional magnetic resonance imaging (fMRI) and brain tissue proteomic data in rats and fMRI and clinical symptom data in patients were analyzed. RESULTS The regional homogeneity (ReHo) analysis of fMRI data revealed an increase in the frontal cortex and a decrease in the posterior cortex in the MAM rats, representing the abnormal neurodevelopmental pattern in MPDs. In regard to the effects of rTMS, similar neuroimaging changes, particularly reduced frontal ReHo, were found both in MAM rats and adolescent patients, suggesting that rTMS may reverse the abnormal neurodevelopmental pattern. Proteomic analysis revealed that rTMS modulated frontal synapse-associated proteins, which may be the underpinnings of rTMS efficacy. Furthermore, a positive relationship was observed between frontal ReHo and clinical symptoms after rTMS in patients. CONCLUSION Visual cortex rTMS was proven to be an effective treatment for adolescent MPDs, and the underlying neural and molecular mechanisms were uncovered. Our study provides translational evidence for therapeutics targeting the neurodevelopmental factor in MPDs.
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Affiliation(s)
- Juan Liu
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Huiling Guo
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
- School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjingJiangsuChina
| | - Jingyu Yang
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Yao Xiao
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Aoling Cai
- School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjingJiangsuChina
- Changzhou Second People's Hospital, Changzhou Medical CenterNanjing Medical UniversityChangzhouJiangsuChina
| | - Tongtong Zhao
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Fay Y. Womer
- Department of Psychiatry and Behavioral SciencesVanderbilt University Medical CenterNashvilleTennesseeUSA
| | - Pengfei Zhao
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Junjie Zheng
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Xizhe Zhang
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- School of Biomedical Engineering and InformaticsNanjing Medical UniversityNanjingJiangsuChina
| | - Jie Wang
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences‐Wuhan National Laboratory for OptoelectronicsWuhanChina
- University of Chinese Academy of SciencesBeijingChina
| | - Rongxin Zhu
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
| | - Fei Wang
- Early Intervention Unit, Department of Psychiatry, Affiliated Nanjing Brain HospitalNanjing Medical UniversityNanjingJiangsuChina
- Functional Brain Imaging Institute of Nanjing Medical UniversityNanjingChina
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Kaar SJ, Nottage JF, Angelescu I, Marques TR, Howes OD. Gamma Oscillations and Potassium Channel Modulation in Schizophrenia: Targeting GABAergic Dysfunction. Clin EEG Neurosci 2024; 55:203-213. [PMID: 36591873 PMCID: PMC10851642 DOI: 10.1177/15500594221148643] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Revised: 12/08/2022] [Accepted: 12/12/2022] [Indexed: 01/03/2023]
Abstract
Impairments in gamma-aminobutyric acid (GABAergic) interneuron function lead to gamma power abnormalities and are thought to underlie symptoms in people with schizophrenia. Voltage-gated potassium 3.1 (Kv3.1) and 3.2 (Kv3.2) channels on GABAergic interneurons are critical to the generation of gamma oscillations suggesting that targeting Kv3.1/3.2 could augment GABAergic function and modulate gamma oscillation generation. Here, we studied the effect of a novel potassium Kv3.1/3.2 channel modulator, AUT00206, on resting state frontal gamma power in people with schizophrenia. We found a significant positive correlation between frontal resting gamma (35-45 Hz) power (n = 22, r = 0.613, P < .002) and positive and negative syndrome scale (PANSS) positive symptom severity. We also found a significant reduction in frontal gamma power (t13 = 3.635, P = .003) from baseline in patients who received AUT00206. This provides initial evidence that the Kv3.1/3.2 potassium channel modulator, AUT00206, may address gamma oscillation abnormalities in schizophrenia.
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Affiliation(s)
- Stephen J. Kaar
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC London Institute of Medical Sciences, Hammersmith Hospital, London, UK
- Division of Psychology and Mental Health, Faculty of Biology, Medicine, and Health, University of Manchester, Manchester, UK
| | - Judith F. Nottage
- Department of Neuroimaging, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
| | - Ilinca Angelescu
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- Max Planck UCL Centre for Computational Psychiatry and Ageing Research London, London, UK
| | - Tiago Reis Marques
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC London Institute of Medical Sciences, Hammersmith Hospital, London, UK
| | - Oliver D. Howes
- Department of Psychosis Studies, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK
- MRC London Institute of Medical Sciences, Hammersmith Hospital, London, UK
- Faculty of Medicine, Institute of Clinical Sciences (ICS), Imperial College London, London, UK
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Adult stress exposure blunts dopamine system hyperresponsivity in a neurodevelopmental rodent model of schizophrenia. SCHIZOPHRENIA 2022; 8:30. [PMID: 35338155 PMCID: PMC8956652 DOI: 10.1038/s41537-022-00235-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 01/31/2022] [Indexed: 11/08/2022]
Abstract
Stress is a major risk factor for the development of both schizophrenia and depression, and comorbidity between the two is common in schizoaffective disorders. However, the effects of stress exposure (i.e. chronic mild stress-CMS) on depression-related phenotypes in a neurodevelopmental model relevant to schizophrenia (i.e. methylazoxymethanol acetate—MAM) have yet to be explored and could provide insight into shared mechanisms of disease. To this end, we combined the prenatal MAM model with adult CMS exposure and explored the resultant pathophysiology using the social approach test (SAT), immobility in the forced swim test (FST) and amphetamine-induced hyperlocomotion (AIH) as depression- and schizophrenia-related endophenotypes and performed extracellular recordings of ventral tegmental area (VTA) DA neurons. MAM rats exhibited a reduction in social approach and increased VTA DA neuron activity compared to SAL rats or CMS groups. Separate cohorts of MAM animals were subjected to FST and AIH testing (counterbalanced order) or FST only. CMS groups exhibited increased FST immobility. Post-FST, both MAM groups (MAM-CON, MAM-CMS) exhibited blunted locomotor response to amphetamine compared with their SAL counterparts exposed to the same tests. Post-FST, MAM rats exhibited comparable VTA population activity to SAL rats, and CMS groups exhibited attenuated VTA population activity. Apomorphine administration results were consistent with the model suggesting that reductions in VTA DA neuron activity in MAM rats following FST exposure resulted from over-excitation, or depolarization block. These data suggest stress-induced DA downregulation in MAM rats, as FST exposure was sufficient to block the DA hyperresponsivity phenotype.
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Cuenod M, Steullet P, Cabungcal JH, Dwir D, Khadimallah I, Klauser P, Conus P, Do KQ. Caught in vicious circles: a perspective on dynamic feed-forward loops driving oxidative stress in schizophrenia. Mol Psychiatry 2022; 27:1886-1897. [PMID: 34759358 PMCID: PMC9126811 DOI: 10.1038/s41380-021-01374-w] [Citation(s) in RCA: 51] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/18/2021] [Accepted: 10/20/2021] [Indexed: 12/18/2022]
Abstract
A growing body of evidence has emerged demonstrating a pathological link between oxidative stress and schizophrenia. This evidence identifies oxidative stress as a convergence point or "central hub" for schizophrenia genetic and environmental risk factors. Here we review the existing experimental and translational research pinpointing the complex dynamics of oxidative stress mechanisms and their modulation in relation to schizophrenia pathophysiology. We focus on evidence supporting the crucial role of either redox dysregulation, N-methyl-D-aspartate receptor hypofunction, neuroinflammation or mitochondria bioenergetics dysfunction, initiating "vicious circles" centered on oxidative stress during neurodevelopment. These processes would amplify one another in positive feed-forward loops, leading to persistent impairments of the maturation and function of local parvalbumin-GABAergic neurons microcircuits and myelinated fibers of long-range macrocircuitry. This is at the basis of neural circuit synchronization impairments and cognitive, emotional, social and sensory deficits characteristic of schizophrenia. Potential therapeutic approaches that aim at breaking these different vicious circles represent promising strategies for timely and safe interventions. In order to improve early detection and increase the signal-to-noise ratio for adjunctive trials of antioxidant, anti-inflammatory and NMDAR modulator drugs, a reverse translation of validated circuitry approach is needed. The above presented processes allow to identify mechanism based biomarkers guiding stratification of homogenous patients groups and target engagement required for successful clinical trials, paving the way towards precision medicine in psychiatry.
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Affiliation(s)
- Michel Cuenod
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland
| | - Pascal Steullet
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland
| | - Jan-Harry Cabungcal
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland
| | - Daniella Dwir
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland
| | - Ines Khadimallah
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland
| | - Paul Klauser
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland
- Service of Child and Adolescent Psychiatry, Department of Psychiatry, Lausanne University Hospital, Prilly, Lausanne, Switzerland
| | - Philippe Conus
- Service of General Psychiatry, Department of Psychiatry, Lausanne University Hospital, Prilly, Lausanne, Switzerland
| | - Kim Q Do
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital (CHUV), Prilly, Lausanne, Switzerland.
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5
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Islam KUS, Meli N, Blaess S. The Development of the Mesoprefrontal Dopaminergic System in Health and Disease. Front Neural Circuits 2021; 15:746582. [PMID: 34712123 PMCID: PMC8546303 DOI: 10.3389/fncir.2021.746582] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 09/10/2021] [Indexed: 12/18/2022] Open
Abstract
Midbrain dopaminergic neurons located in the substantia nigra and the ventral tegmental area are the main source of dopamine in the brain. They send out projections to a variety of forebrain structures, including dorsal striatum, nucleus accumbens, and prefrontal cortex (PFC), establishing the nigrostriatal, mesolimbic, and mesoprefrontal pathways, respectively. The dopaminergic input to the PFC is essential for the performance of higher cognitive functions such as working memory, attention, planning, and decision making. The gradual maturation of these cognitive skills during postnatal development correlates with the maturation of PFC local circuits, which undergo a lengthy functional remodeling process during the neonatal and adolescence stage. During this period, the mesoprefrontal dopaminergic innervation also matures: the fibers are rather sparse at prenatal stages and slowly increase in density during postnatal development to finally reach a stable pattern in early adulthood. Despite the prominent role of dopamine in the regulation of PFC function, relatively little is known about how the dopaminergic innervation is established in the PFC, whether and how it influences the maturation of local circuits and how exactly it facilitates cognitive functions in the PFC. In this review, we provide an overview of the development of the mesoprefrontal dopaminergic system in rodents and primates and discuss the role of altered dopaminergic signaling in neuropsychiatric and neurodevelopmental disorders.
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Affiliation(s)
- K Ushna S Islam
- Neurodevelopmental Genetics, Institute of Reconstructive Neurobiology, Medical Faculty, University of Bonn, Bonn, Germany
| | - Norisa Meli
- Neurodevelopmental Genetics, Institute of Reconstructive Neurobiology, Medical Faculty, University of Bonn, Bonn, Germany.,Institute of Neuropathology, Section for Translational Epilepsy Research, Medical Faculty, University of Bonn, Bonn, Germany
| | - Sandra Blaess
- Neurodevelopmental Genetics, Institute of Reconstructive Neurobiology, Medical Faculty, University of Bonn, Bonn, Germany
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6
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Perkins DO, Jeffries CD, Do KQ. Potential Roles of Redox Dysregulation in the Development of Schizophrenia. Biol Psychiatry 2020; 88:326-336. [PMID: 32560962 PMCID: PMC7395886 DOI: 10.1016/j.biopsych.2020.03.016] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 03/03/2020] [Accepted: 03/22/2020] [Indexed: 12/20/2022]
Abstract
Converging evidence implicates redox dysregulation as a pathological mechanism driving the emergence of psychosis. Increased oxidative damage and decreased capacity of intracellular redox modulatory systems are consistent findings in persons with schizophrenia as well as in persons at clinical high risk who subsequently developed frank psychosis. Levels of glutathione, a key regulator of cellular redox status, are reduced in the medial prefrontal cortex, striatum, and thalamus in schizophrenia. In humans with schizophrenia and in rodent models recapitulating various features of schizophrenia, redox dysregulation is linked to reductions of parvalbumin containing gamma-aminobutyric acid (GABA) interneurons and volumes of their perineuronal nets, white matter abnormalities, and microglia activation. Importantly, the activity of transcription factors, kinases, and phosphatases regulating diverse aspects of neurodevelopment and synaptic plasticity varies according to cellular redox state. Molecules regulating interneuron function under redox control include NMDA receptor subunits GluN1 and GluN2A as well as KEAP1 (regulator of transcription factor NRF2). In a rodent schizophrenia model characterized by impaired glutathione synthesis, the Gclm knockout mouse, oxidative stress activated MMP9 (matrix metalloprotease 9) via its redox-responsive regulatory sites, causing a cascade of molecular events leading to microglia activation, perineural net degradation, and impaired NMDA receptor function. Molecular pathways under redox control are implicated in the etiopathology of schizophrenia and are attractive drug targets for individualized drug therapy trials in the contexts of prevention and treatment of psychosis.
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Affiliation(s)
- Diana O. Perkins
- corresponding author: CB 7160, Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27514, Office: 919-962-1401, Cell: 919-360-1602,
| | - Clark D. Jeffries
- Renaissance Computing Institute, University of North Carolina, Chapel Hill NC
| | - Kim Q. Do
- Center for Psychiatric Neuroscience, Department of Psychiatry, Lausanne University Hospital-CHUV, Prilly-Lausanne, Switzerland
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7
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Hidalgo S, Castro C, Zárate RV, Valderrama BP, Hodge JJL, Campusano JM. The behavioral and neurochemical characterization of a Drosophila dysbindin mutant supports the contribution of serotonin to schizophrenia negative symptoms. Neurochem Int 2020; 138:104753. [PMID: 32416114 DOI: 10.1016/j.neuint.2020.104753] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 04/09/2020] [Accepted: 05/08/2020] [Indexed: 01/03/2023]
Abstract
Mutations in the dystrobrevin binding protein 1 (DTNBP1) gene that encodes for the dysbindin-1 protein, are associated with a higher risk for schizophrenia. Interestingly, individuals carrying high-risk alleles in this gene have been associated with an increased incidence of negative symptoms for the disease, which include anhedonia, avolition and social withdrawal. Here we evaluated behavioral and neurochemical changes in a hypomorphic Drosophila mutant for the orthologue of human Dysbindin-1, dysb1. Mutant dysb1 flies exhibit altered social space parameters, suggesting asocial behavior, accompanied by reduced olfactory performance. Moreover, dysb1 mutant flies show poor performance in basal and startle-induced locomotor activity. We also report a reduction in serotonin brain levels and changes in the expression of the Drosophila serotonin transporter (dSERT) in dysb1 flies. Our data show that the serotonin-releasing amphetamine derivative 4-methylthioamphetamine (4-MTA) modulates social spacing and locomotion in control flies, suggesting that serotonergic circuits modulate these behaviors. 4-MTA was unable to modify the behavioral deficiencies in mutant flies, which is consistent with the idea that the efficiency of pharmacological agents acting at dSERT depends on functional serotonergic circuits. Thus, our data show that the dysb1 mutant exhibits behavioral deficits that mirror some aspects of the endophenotypes associated with the negative symptoms of schizophrenia. We argue that at least part of the behavioral aspects associated with these symptoms could be explained by a serotonergic deficit. The dysb1 mutant presents an opportunity to study the molecular underpinnings of schizophrenia negative symptoms and reveals new potential targets for treatment of the disease.
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Affiliation(s)
- Sergio Hidalgo
- Departamento de Biología Cellular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile; School of Physiology, Pharmacology and Neuroscience, Faculty of Life Science, University of Bristol, UK.
| | - Christian Castro
- Departamento de Biología Cellular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile
| | - Rafaella V Zárate
- Departamento de Biología Cellular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile
| | - Benjamín P Valderrama
- Departamento de Biología Cellular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile
| | - James J L Hodge
- School of Physiology, Pharmacology and Neuroscience, Faculty of Life Science, University of Bristol, UK
| | - Jorge M Campusano
- Departamento de Biología Cellular y Molecular, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Chile.
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Multiple Adenosine-Dopamine (A2A-D2 Like) Heteroreceptor Complexes in the Brain and Their Role in Schizophrenia. Cells 2020; 9:cells9051077. [PMID: 32349279 PMCID: PMC7290895 DOI: 10.3390/cells9051077] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/20/2020] [Accepted: 04/20/2020] [Indexed: 12/21/2022] Open
Abstract
In the 1980s and 1990s, the concept was introduced that molecular integration in the Central Nervous System could develop through allosteric receptor–receptor interactions in heteroreceptor complexes presents in neurons. A number of adenosine–dopamine heteroreceptor complexes were identified that lead to the A2A-D2 heteromer hypothesis of schizophrenia. The hypothesis is based on strong antagonistic A2A-D2 receptor–receptor interactions and their presence in the ventral striato-pallidal GABA anti-reward neurons leading to reduction of positive symptoms. Other types of adenosine A2A heteroreceptor complexes are also discussed in relation to this disease, such as A2A-D3 and A2A-D4 heteroreceptor complexes as well as higher order A2A-D2-mGluR5 and A2A-D2-Sigma1R heteroreceptor complexes. The A2A receptor protomer can likely modulate the function of the D4 receptors of relevance for understanding cognitive dysfunction in schizophrenia. A2A-D2-mGluR5 complex is of interest since upon A2A/mGluR5 coactivation they appear to synergize in producing strong inhibition of the D2 receptor protomer. For understanding the future of the schizophrenia treatment, the vulnerability of the current A2A-D2like receptor complexes will be tested in animal models of schizophrenia. A2A-D2-Simag1R complexes hold the highest promise through Sigma1R enhancement of inhibition of D2R function. In line with this work, Lara proposed a highly relevant role of adenosine for neurobiology of schizophrenia.
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McCutcheon RA, Krystal JH, Howes OD. Dopamine and glutamate in schizophrenia: biology, symptoms and treatment. World Psychiatry 2020; 19:15-33. [PMID: 31922684 PMCID: PMC6953551 DOI: 10.1002/wps.20693] [Citation(s) in RCA: 278] [Impact Index Per Article: 69.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Glutamate and dopamine systems play distinct roles in terms of neuronal signalling, yet both have been proposed to contribute significantly to the pathophysiology of schizophrenia. In this paper we assess research that has implicated both systems in the aetiology of this disorder. We examine evidence from post-mortem, preclinical, pharmacological and in vivo neuroimaging studies. Pharmacological and preclinical studies implicate both systems, and in vivo imaging of the dopamine system has consistently identified elevated striatal dopamine synthesis and release capacity in schizophrenia. Imaging of the glutamate system and other aspects of research on the dopamine system have produced less consistent findings, potentially due to methodological limitations and the heterogeneity of the disorder. Converging evidence indicates that genetic and environmental risk factors for schizophrenia underlie disruption of glutamatergic and dopaminergic function. However, while genetic influences may directly underlie glutamatergic dysfunction, few genetic risk variants directly implicate the dopamine system, indicating that aberrant dopamine signalling is likely to be predominantly due to other factors. We discuss the neural circuits through which the two systems interact, and how their disruption may cause psychotic symptoms. We also discuss mechanisms through which existing treatments operate, and how recent research has highlighted opportunities for the development of novel pharmacological therapies. Finally, we consider outstanding questions for the field, including what remains unknown regarding the nature of glutamate and dopamine function in schizophrenia, and what needs to be achieved to make progress in developing new treatments.
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Affiliation(s)
- Robert A McCutcheon
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- MRC London Institute of Medical Sciences, Imperial College London, Hammersmith Hospital, London, UK
- South London and Maudsley Foundation NHS Trust, Maudsley Hospital, London, UK
| | - John H Krystal
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
- VA National Center for PTSD, VA Connecticut Healthcare System, West Haven, CT, USA
| | - Oliver D Howes
- Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
- MRC London Institute of Medical Sciences, Imperial College London, Hammersmith Hospital, London, UK
- South London and Maudsley Foundation NHS Trust, Maudsley Hospital, London, UK
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Cortez IL, Rodrigues da Silva N, Guimarães FS, Gomes FV. Are CB2 Receptors a New Target for Schizophrenia Treatment? Front Psychiatry 2020; 11:587154. [PMID: 33329132 PMCID: PMC7673393 DOI: 10.3389/fpsyt.2020.587154] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 09/30/2020] [Indexed: 01/25/2023] Open
Abstract
Schizophrenia is a complex disorder that involves several neurotransmitters such as dopamine, glutamate, and GABA. More recently, the endocannabinoid system has also been associated with this disorder. Although initially described as present mostly in the periphery, cannabinoid type-2 (CB2) receptors are now proposed to play a role in several brain processes related to schizophrenia, such as modulation of dopaminergic neurotransmission, microglial activation, and neuroplastic changes induced by stress. Here, we reviewed studies describing the involvement of the CB2 receptor in these processes and their association with the pathophysiology of schizophrenia. Taken together, these pieces of evidence indicate that CB2 receptor may emerge as a new target for the development of antipsychotic drugs.
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Affiliation(s)
- Isadora L Cortez
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Naielly Rodrigues da Silva
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Francisco S Guimarães
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Felipe V Gomes
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
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Nakazawa K, Sapkota K. The origin of NMDA receptor hypofunction in schizophrenia. Pharmacol Ther 2019; 205:107426. [PMID: 31629007 DOI: 10.1016/j.pharmthera.2019.107426] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 10/10/2019] [Indexed: 12/12/2022]
Abstract
N-methyl-d-aspartate (NMDA) receptor (NMDAR) hypofunction plays a key role in pathophysiology of schizophrenia. Since NMDAR hypofunction has also been reported in autism, Alzheimer's disease and cognitive dementia, it is crucial to identify the location, timing, and mechanism of NMDAR hypofunction for schizophrenia for better understanding of disease etiology and for novel therapeutic intervention. In this review, we first discuss the shared underlying mechanisms of NMDAR hypofunction in NMDAR antagonist models and the anti-NMDAR autoantibody model of schizophrenia and suggest that NMDAR hypofunction could occur in GABAergic neurons in both models. Preclinical models using transgenic mice have shown that NMDAR hypofunction in cortical GABAergic neurons, in particular parvalbumin-positive fast-spiking interneurons, in the early postnatal period confers schizophrenia-related phenotypes. Recent studies suggest that NMDAR hypofunction can also occur in PV-positive GABAergic neurons with alterations of NMDAR-associated proteins, such as neuregulin/ErbB4, α7nAChR, and serine racemase. Furthermore, several environmental factors, such as oxidative stress, kynurenic acid and hypoxia, may also potentially elicit NMDAR hypofunction in GABAergic neurons in early postnatal period. Altogether, the studies discussed here support a central role for GABAergic abnormalities in the context of NMDAR hypofunction. We conclude by suggesting potential therapeutic strategies to improve the function of fast-spiking neurons.
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Klinger K, Gomes FV, Rincón-Cortés M, Grace AA. Female rats are resistant to the long-lasting neurobehavioral changes induced by adolescent stress exposure. Eur Neuropsychopharmacol 2019; 29:1127-1137. [PMID: 31371105 PMCID: PMC6773464 DOI: 10.1016/j.euroneuro.2019.07.134] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 05/30/2019] [Accepted: 07/15/2019] [Indexed: 01/10/2023]
Abstract
Stress during adolescence is a risk factor for neuropsychiatric diseases, including schizophrenia. We recently observed that peripubertal male rats exposed to a combination of daily footshock plus restraint stress exhibited schizophrenia-like changes. However, numerous studies have shown sex differences in neuropsychiatric diseases as well as on the impact of coping with stress. Thus, we decided to evaluate, in adolescent female rats, the impact of different stressors (restraint stress [RS], footshock [FS], or the combination of FS and RS [FS+RS]) on social interaction (3-chamber social approach test/SAT), anxiety responses (elevated plus-maze/EPM), cognitive function (novel object recognition test/NOR), and dopamine (DA) system responsivity by evaluating locomotor response to amphetamine and in vivo extracellular single unit recordings of DA neurons in the ventral tegmental area (VTA) in adulthood. The impact of FS+RS during early adulthood was also investigated. Adolescent stress had no impact on social behavior, anxiety, cognition and locomotor response to amphetamine. In addition, adolescent stress did not induce long-lasting changes in VTA DA system activity. However, a decrease in the firing rate of VTA DA neurons was found 1-2 weeks post-adolescent stress. Similar to adolescent stress, adult stress did not induce long-lasting behavioral deficits and changes in VTA DA system activity, but FS+RS decreased VTA DA neuron population activity 1-2 weeks post-adult stress. Our results are consistent with previous studies showing that female rodents appear to be more resilient to developmental stress-induced persistent changes than males and may contribute to the delayed onset and lesser severity of schizophrenia in females.
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Affiliation(s)
- Katharina Klinger
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, A210 Langley Hall, Pittsburgh, PA 15260, USA; Institute of Genetic and Molecular Neurobiology, Otto-von-Guericke University, University of Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
| | - Felipe V Gomes
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, A210 Langley Hall, Pittsburgh, PA 15260, USA; Department of Pharmacology, Ribeirao Preto Medical School, University of Sao Paulo, 3900 Bandeirantes Ave, Ribeirao Preto, SP, 14049-900, Brazil
| | - Millie Rincón-Cortés
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, A210 Langley Hall, Pittsburgh, PA 15260, USA
| | - Anthony A Grace
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, A210 Langley Hall, Pittsburgh, PA 15260, USA.
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A Novel Biomarker Renalase and Its Relationship with its Substrates in Schizophrenia. J Med Biochem 2019; 38:299-305. [PMID: 31156340 PMCID: PMC6534954 DOI: 10.2478/jomb-2018-0031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 09/09/2018] [Indexed: 01/22/2023] Open
Abstract
Background Schizophrenia, particularly the form related to excessive dopamine (DA), is a chronic psychotic disorder affecting millions of people worldwide. Renalase metabolizes its catecholamine (CA) substrates, including DA, suggesting that there might be an association between renalase levels and schizophrenia occurrence. Therefore, the current study aimed to evaluate the renalase and CA levels in the serum of patients with schizophrenia. Methods The study was conducted with thirty-three schizophrenia patients and an age- and gender-matched group of thirty-one controls. Renalase and CA levels were measured by using an enzyme-linked immunosorbent assay (ELISA). Results Renalase levels were significantly lower in the schizophrenia patients than in the control group (p<0.05), whereas DA levels were significantly higher (p<0.05). The epinephrine (Epi) levels of both groups were similar (p=0.186), while the norepinephrine levels in patients with schizophrenia were significantly lower than those in the control group (p<0.05). The areas under the curves for the renalase-dopamine, renalase-norepinephrine and renalase-epinephrine ratios were 0.805, 95% confidence interval (CI): 0.699–0.912 (p<0.001); 0.726, 95% CI: 0.594–0.859 (p=0.032); and 0.656, 95% CI: 0.520–0.791 (p=0.02). Conclusions The high DA levels in patients with schizophrenia might be due to low renalase levels. Renalase enzyme levels may play a substantial role in the pathophysiology of schizophrenia. Thus, this enzyme might be a new future target for the treatment and diagnosis of schizophrenia after intrabrain renalase and DA dynamics have been further evaluated.
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Development of the MAM model of schizophrenia in mice: Sex similarities and differences of hippocampal and prefrontal cortical function. Neuropharmacology 2019; 144:193-207. [DOI: 10.1016/j.neuropharm.2018.10.026] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 10/06/2018] [Accepted: 10/19/2018] [Indexed: 12/31/2022]
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15
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Grace AA, Gomes FV. The Circuitry of Dopamine System Regulation and its Disruption in Schizophrenia: Insights Into Treatment and Prevention. Schizophr Bull 2019; 45:148-157. [PMID: 29385549 PMCID: PMC6293217 DOI: 10.1093/schbul/sbx199] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Despite evidence for a role of the dopamine system in the pathophysiology of schizophrenia, there has not been substantial evidence that this disorder originates from a pathological change within the dopamine system itself. Current data from human imaging studies and preclinical investigations instead point to a disruption in afferent regulation of the dopamine system, with a focus on the hippocampus. We found that the hippocampus in the methylazoxymethanol acetate (MAM) rodent developmental disruption model of schizophrenia is hyperactive and dysrhythmic, possibly due to loss of parvalbumin interneurons, leading to a hyperresponsive dopamine system. Whereas current therapeutic approaches target dopamine receptor blockade, treatment at the site of pathology may be a more effective therapeutic avenue. This model also provided insights into potential means for prevention of schizophrenia. Specifically, given that stress is a risk factor in schizophrenia, and that stress can damage hippocampal parvalbumin interneurons, we tested whether alleviating stress early in life can effectively circumvent transition to schizophrenia-like states. Administering diazepam prepubertally at an antianxiety dose in MAM rats was effective at preventing the emergence of the hyperdopaminergic state in the adult. Moreover, multiple stressors applied to normal rats at the same time point resulted in pathology similar to the MAM rat. These data suggest that a genetic predisposition leading to stress hyper-responsivity, or exposure to substantial stressors, could be a primary factor leading to the emergence of schizophrenia later in life, and furthermore treating stress at a critical period may be effective in circumventing this transition.
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Affiliation(s)
- Anthony A Grace
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, Pittsburgh, PA,To whom correspondence should be addressed; Departments of Neuroscience, Psychiatry and Psychology, A210 Langley Hall, University of Pittsburgh, Pittsburgh, PA 15260, US; tel: 412-624-4609, fax: 412-624-9198, e-mail:
| | - Felipe V Gomes
- Departments of Neuroscience, Psychiatry and Psychology, University of Pittsburgh, Pittsburgh, PA
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16
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Lee S, Kang S, Ang MJ, Kim J, Kim JC, Kim SH, Jeon TI, Jung C, Im SS, Moon C. Deficiency of sterol regulatory element-binding protein-1c induces schizophrenia-like behavior in mice. GENES BRAIN AND BEHAVIOR 2018; 18:e12540. [PMID: 30430717 DOI: 10.1111/gbb.12540] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/26/2018] [Accepted: 11/11/2018] [Indexed: 01/12/2023]
Abstract
Schizophrenia is a hereditary disease that approximately 1% of the worldwide population develops. Many studies have investigated possible underlying genes related to schizophrenia. Recently, clinical studies suggested sterol regulatory element-binding protein (SREBP) as a susceptibility gene in patients with schizophrenia. SREBP controls cellular lipid homeostasis by three isoforms: SREBP-1a, SREBP-1c and SREBP-2. This study used SREBP-1c knockout (KO) mice to examine whether a deficiency in SREBP-1c would affect their emotional and psychiatric behaviors. Altered mRNA expression in genes downstream from SREBP-1c was confirmed in the brains of SREBP-1c KO mice. Schizophrenia-like behavior, including hyperactivity during the dark phase, depressive-like behavior, aggressive behavior and deficits in social interaction and prepulse inhibition, was observed in SREBP-1c KO mice. Furthermore, increased volume of the lateral ventricle was detected in SREBP-1c KO mice. The mRNA levels of several γ-aminobutyric acid (GABA)-receptor subtypes and/or glutamic acid decarboxylase 65/67 decreased in the hippocampus and medial prefrontal cortex of SREBP-1c KO mice. Thus, SREBP-1c deficiency may contribute to enlargement of the lateral ventricle and development of schizophrenia-like behaviors and be associated with altered GABAergic transmission.
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Affiliation(s)
- Sueun Lee
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
| | - Sohi Kang
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
| | - Mary Jasmin Ang
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
| | - Juhwan Kim
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
| | - Jong Choon Kim
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
| | - Sung-Ho Kim
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
| | - Tae-Il Jeon
- Department of Animal Science, College of Agriculture and Life Science, Chonnam National University, Gwangju, South Korea
| | - Chaeyong Jung
- Department of Anatomy, Chonnam National University Medical School, Gwangju, South Korea
| | - Seung-Soon Im
- Department of Physiology, Keimyung University School of Medicine, Daegu, South Korea
| | - Changjong Moon
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 Plus Project Team, Chonnam National University, Gwangju, South Korea
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Wolthusen RPF, Coombs G, Boeke EA, Ehrlich S, DeCross SN, Nasr S, Holt DJ. Correlation Between Levels of Delusional Beliefs and Perfusion of the Hippocampus and an Associated Network in a Non-Help-Seeking Population. BIOLOGICAL PSYCHIATRY: COGNITIVE NEUROSCIENCE AND NEUROIMAGING 2018. [PMID: 29529413 DOI: 10.1016/j.bpsc.2017.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Delusions are a defining and common symptom of psychotic disorders. Recent evidence suggests that subclinical and clinical delusions may represent distinct stages on a phenomenological and biological continuum. However, few studies have tested whether subclinical psychotic experiences are associated with neural changes that are similar to those observed in clinical psychosis. For example, it is unclear if overactivity of the hippocampus, a replicated finding of neuroimaging studies of schizophrenia, is also present in individuals with subclinical psychotic symptoms. METHODS To investigate this question, structural and pulsed arterial spin labeling scans were collected in 77 adult participants with no psychiatric history. An anatomical region of interest approach was used to extract resting perfusion of the hippocampus, and 15 other regions, from each individual. A self-report measure of delusional ideation was collected on the day of scanning. RESULTS The level of delusional thinking (number of beliefs [r = .27, p = .02]), as well as the associated level of distress (r = .29, p = .02), was significantly correlated with hippocampal perfusion (averaged over right and left hemispheres). The correlations remained significant after controlling for age, hippocampal volume, symptoms of depression and anxiety, and image signal-to-noise ratio, and they were confirmed in a voxelwise regression analysis. The same association was observed in the thalamus and parahippocampal, lateral temporal, and cingulate cortices. CONCLUSIONS Similar to patients with schizophrenia, non-help-seeking individuals show elevated perfusion of a network of limbic regions in association with delusional beliefs.
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Affiliation(s)
- Rick P F Wolthusen
- Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts; Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts; Division of Psychological and Social Medicine and Developmental Neurosciences, Faculty of Medicine Carl Gustav Carus of the Technische Universität Dresden, Dresden, Germany
| | - Garth Coombs
- Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts; Department of Psychology, Harvard University, Cambridge, Massachusetts
| | - Emily A Boeke
- Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts; Department of Psychology, New York University, New York, New York
| | - Stefan Ehrlich
- Division of Psychological and Social Medicine and Developmental Neurosciences, Faculty of Medicine Carl Gustav Carus of the Technische Universität Dresden, Dresden, Germany
| | - Stephanie N DeCross
- Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts; Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts
| | - Shahin Nasr
- Department of Radiology, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts
| | - Daphne J Holt
- Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, Massachusetts.
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Bossong MG, Wilson R, Appiah-Kusi E, McGuire P, Bhattacharyya S. Human Striatal Response to Reward Anticipation Linked to Hippocampal Glutamate Levels. Int J Neuropsychopharmacol 2018; 21:623-630. [PMID: 29444252 PMCID: PMC6030901 DOI: 10.1093/ijnp/pyy011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 02/09/2018] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Dysfunctional reward processing is associated with a number of psychiatric disorders, such as addiction and schizophrenia. It is thought that reward is regulated mainly by dopamine transmission in the ventral striatum. Contemporary animal models suggest that striatal dopamine concentrations and associated behaviors are related to glutamatergic functioning in the ventral hippocampus. However, in humans the association between reward-related ventral striatal response and hippocampal glutamate levels is unclear. METHODS Nineteen healthy participants were studied using proton magnetic resonance spectroscopy to measure hippocampal glutamate levels, and functional magnetic resonance imaging to assess striatal activation and functional connectivity during performance of a monetary incentive delay task. RESULTS We found that ventral striatal activation related to reward processing was correlated with hippocampal glutamate levels. In addition, context-dependent functional coupling was demonstrated between the ventral striatum and both the lingual gyrus and hippocampus during reward anticipation. Elevated hippocampal glutamate levels were inversely related to context-dependent functional connectivity between the ventral striatum and the anterior hippocampus while anticipating reward. CONCLUSIONS These findings indicate that human striatal responses to reward are influenced by hippocampal glutamate levels. This may be relevant for psychiatric disorders associated with abnormal reward processing such as addiction and schizophrenia.
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Affiliation(s)
- Matthijs G Bossong
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, United Kingdom,Department of Psychiatry, Brain Center Rudolf Magnus, University Medical Center Utrecht, The Netherlands,Correspondence: Matthijs G. Bossong, PhD, Brain Center Rudolf Magnus, Department of Psychiatry, A01.126, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX Utrecht, The Netherlands ()
| | - Robin Wilson
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, United Kingdom
| | - Elizabeth Appiah-Kusi
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, United Kingdom
| | - Philip McGuire
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, United Kingdom
| | - Sagnik Bhattacharyya
- Department of Psychosis Studies, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, United Kingdom
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Hudson R, Rushlow W, Laviolette SR. Phytocannabinoids modulate emotional memory processing through interactions with the ventral hippocampus and mesolimbic dopamine system: implications for neuropsychiatric pathology. Psychopharmacology (Berl) 2018; 235:447-458. [PMID: 29063964 DOI: 10.1007/s00213-017-4766-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 10/13/2017] [Indexed: 11/28/2022]
Abstract
Growing clinical and preclinical evidence suggests a potential role for the phytocannabinoid cannabidiol (CBD) as a pharmacotherapy for various neuropsychiatric disorders. In contrast, delta-9-tetrahydrocannabinol (THC), the primary psychoactive component in cannabis, is associated with acute and neurodevelopmental propsychotic side effects through its interaction with central cannabinoid type 1 receptors (CB1Rs). CB1R stimulation in the ventral hippocampus (VHipp) potentiates affective memory formation through inputs to the mesolimbic dopamine (DA) system, thereby altering emotional salience attribution. These changes in DA activity and salience attribution, evoked by dysfunctional VHipp regulatory actions and THC exposure, could predispose susceptible individuals to psychotic symptoms. Although THC can accelerate the onset of schizophrenia, CBD displays antipsychotic properties, can prevent the acquisition of emotionally irrelevant memories, and reverses amphetamine-induced neuronal sensitization through selective phosphorylation of the mechanistic target of rapamycin (mTOR) molecular signaling pathway. This review summarizes clinical and preclinical evidence demonstrating that distinct phytocannabinoids act within the VHipp and associated corticolimbic structures to modulate emotional memory processing through changes in mesolimbic DA activity states, salience attribution, and signal transduction pathways associated with schizophrenia-related pathology.
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Affiliation(s)
- Roger Hudson
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON, N6A 3K7, Canada
| | - Walter Rushlow
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON, N6A 3K7, Canada.,Department of Psychiatry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada
| | - Steven R Laviolette
- Department of Anatomy and Cell Biology, University of Western Ontario, London, ON, N6A 3K7, Canada. .,Department of Psychiatry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada.
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20
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Murray RM, Bhavsar V, Tripoli G, Howes O. 30 Years on: How the Neurodevelopmental Hypothesis of Schizophrenia Morphed Into the Developmental Risk Factor Model of Psychosis. Schizophr Bull 2017; 43:1190-1196. [PMID: 28981842 PMCID: PMC5737804 DOI: 10.1093/schbul/sbx121] [Citation(s) in RCA: 188] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
At its re-birth 30 years ago, the neurodevelopment hypothesis of schizophrenia focussed on aberrant genes and early neural hazards, but then it grew to include ideas concerning aberrant synaptic pruning in adolescence. The hypothesis had its own stormy development and it endured some difficult teenage years when a resurgence of interest in neurodegeneration threatened its survival. In early adult life, it over-reached itself with some reductionists claiming that schizophrenia was simply a neurodevelopmental disease. However, by age 30, the hypothesis has matured sufficiently to incorporated childhood and adult adversity, urban living and migration, as well as heavy cannabis use, as important risk factors. Thus, it morphed into the developmental risk factor model of psychosis and integrated new evidence concerning dysregulated striatal dopamine as the final step on the pathway linking risk factors to psychotic symptoms.
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Affiliation(s)
- Robin M Murray
- Psychosis Studies Department, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK,National Institute for Health Research (NIHR) Mental Health Biomedical Research Centre, South London and Maudsley NHS Foundation Trust and King’s College, London, UK,To whom correspondence should be addressed;
| | - Vishal Bhavsar
- Psychosis Studies Department, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - Giada Tripoli
- Psychosis Studies Department, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK
| | - Oliver Howes
- Psychosis Studies Department, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK,Psychiatric Imaging Group, Clinical Science Centre, Imperial College, London, UK
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Presynaptic Dopamine Synthesis Capacity in Schizophrenia and Striatal Blood Flow Change During Antipsychotic Treatment and Medication-Free Conditions. Neuropsychopharmacology 2017; 42:2232-2241. [PMID: 28387222 PMCID: PMC5603816 DOI: 10.1038/npp.2017.67] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2016] [Revised: 03/23/2017] [Accepted: 03/24/2017] [Indexed: 02/03/2023]
Abstract
Standard-of-care biological treatment of schizophrenia remains dependent upon antipsychotic medications, which demonstrate D2 receptor affinity and elicit variable, partial clinical responses via neural mechanisms that are not entirely understood. In the striatum, where D2 receptors are abundant, antipsychotic medications may affect neural function in studies of animals, healthy volunteers, and patients, yet the relevance of this to pharmacotherapeutic actions remains unresolved. In this same brain region, some individuals with schizophrenia may demonstrate phenotypes consistent with exaggerated dopaminergic signaling, including alterations in dopamine synthesis capacity; however, the hypothesis that dopamine system characteristics underlie variance in medication-induced regional blood flow changes has not been directly tested. We therefore studied a cohort of 30 individuals with schizophrenia using longitudinal, multi-session [15O]-water and [18F]-FDOPA positron emission tomography to determine striatal blood flow during active atypical antipsychotic medication treatment and after at least 3 weeks of placebo treatment, along with presynaptic dopamine synthesis capacity (ie, DOPA decarboxylase activity). Regional striatal blood flow was significantly higher during active treatment than during the placebo condition. Furthermore, medication-related increases in ventral striatal blood flow were associated with more robust amelioration of excited factor symptoms during active medication and with higher dopamine synthesis capacity. These data indicate that atypical medications enact measureable physiological alterations in limbic striatal circuitry that vary as a function of dopaminergic tone and may have relevance to aspects of therapeutic responses.
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Borroto-Escuela DO, Carlsson J, Ambrogini P, Narváez M, Wydra K, Tarakanov AO, Li X, Millón C, Ferraro L, Cuppini R, Tanganelli S, Liu F, Filip M, Diaz-Cabiale Z, Fuxe K. Understanding the Role of GPCR Heteroreceptor Complexes in Modulating the Brain Networks in Health and Disease. Front Cell Neurosci 2017; 11:37. [PMID: 28270751 PMCID: PMC5318393 DOI: 10.3389/fncel.2017.00037] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 02/06/2017] [Indexed: 12/21/2022] Open
Abstract
The introduction of allosteric receptor-receptor interactions in G protein-coupled receptor (GPCR) heteroreceptor complexes of the central nervous system (CNS) gave a new dimension to brain integration and neuropsychopharmacology. The molecular basis of learning and memory was proposed to be based on the reorganization of the homo- and heteroreceptor complexes in the postjunctional membrane of synapses. Long-term memory may be created by the transformation of parts of the heteroreceptor complexes into unique transcription factors which can lead to the formation of specific adapter proteins. The observation of the GPCR heterodimer network (GPCR-HetNet) indicated that the allosteric receptor-receptor interactions dramatically increase GPCR diversity and biased recognition and signaling leading to enhanced specificity in signaling. Dysfunction of the GPCR heteroreceptor complexes can lead to brain disease. The findings of serotonin (5-HT) hetero and isoreceptor complexes in the brain over the last decade give new targets for drug development in major depression. Neuromodulation of neuronal networks in depression via 5-HT, galanin peptides and zinc involve a number of GPCR heteroreceptor complexes in the raphe-hippocampal system: GalR1-5-HT1A, GalR1-5-HT1A-GPR39, GalR1-GalR2, and putative GalR1-GalR2-5-HT1A heteroreceptor complexes. The 5-HT1A receptor protomer remains a receptor enhancing antidepressant actions through its participation in hetero- and homoreceptor complexes listed above in balance with each other. In depression, neuromodulation of neuronal networks in the raphe-hippocampal system and the cortical regions via 5-HT and fibroblast growth factor 2 involves either FGFR1-5-HT1A heteroreceptor complexes or the 5-HT isoreceptor complexes such as 5-HT1A-5-HT7 and 5-HT1A-5-HT2A. Neuromodulation of neuronal networks in cocaine use disorder via dopamine (DA) and adenosine signals involve A2AR-D2R and A2AR-D2R-Sigma1R heteroreceptor complexes in the dorsal and ventral striatum. The excitatory modulation by A2AR agonists of the ventral striato-pallidal GABA anti-reward system via targeting the A2AR-D2R and A2AR-D2R-Sigma1R heteroreceptor complex holds high promise as a new way to treat cocaine use disorders. Neuromodulation of neuronal networks in schizophrenia via DA, adenosine, glutamate, 5-HT and neurotensin peptides and oxytocin, involving A2AR-D2R, D2R-NMDAR, A2AR-D2R-mGluR5, D2R-5-HT2A and D2R-oxytocinR heteroreceptor complexes opens up a new world of D2R protomer targets in the listed heterocomplexes for treatment of positive, negative and cognitive symptoms of schizophrenia.
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Affiliation(s)
- Dasiel O Borroto-Escuela
- Department of Neuroscience, Karolinska InstitutetStockholm, Sweden; Department of Biomolecular Science, Section of Physiology, University of UrbinoUrbino, Italy; Observatorio Cubano de Neurociencias, Grupo Bohío-EstudioYaguajay, Cuba
| | - Jens Carlsson
- Department of Cell and Molecular Biology, Uppsala Biomedical Centre (BMC), Uppsala University Uppsala, Sweden
| | - Patricia Ambrogini
- Department of Biomolecular Science, Section of Physiology, University of Urbino Urbino, Italy
| | - Manuel Narváez
- Facultad de Medicina, Instituto de Investigación Biomédica de Málaga, Universidad de Málaga Málaga, Spain
| | - Karolina Wydra
- Laboratory of Drug Addiction Pharmacology, Department of Pharmacology, Institute of Pharmacology, Polish Academy of Sciences Kraków, Poland
| | - Alexander O Tarakanov
- St. Petersburg Institute for Informatics and Automation, Russian Academy of Sciences Saint Petersburg, Russia
| | - Xiang Li
- Department of Neuroscience, Karolinska Institutet Stockholm, Sweden
| | - Carmelo Millón
- Facultad de Medicina, Instituto de Investigación Biomédica de Málaga, Universidad de Málaga Málaga, Spain
| | - Luca Ferraro
- Department of Life Sciences and Biotechnology, University of Ferrara Ferrara, Italy
| | - Riccardo Cuppini
- Department of Biomolecular Science, Section of Physiology, University of Urbino Urbino, Italy
| | - Sergio Tanganelli
- Department of Medical Sciences, University of Ferrara Ferrara, Italy
| | - Fang Liu
- Campbell Research Institute, Centre for Addiction and Mental Health, University of Toronto Toronto, ON, Canada
| | - Malgorzata Filip
- Laboratory of Drug Addiction Pharmacology, Department of Pharmacology, Institute of Pharmacology, Polish Academy of Sciences Kraków, Poland
| | - Zaida Diaz-Cabiale
- Facultad de Medicina, Instituto de Investigación Biomédica de Málaga, Universidad de Málaga Málaga, Spain
| | - Kjell Fuxe
- Department of Neuroscience, Karolinska Institutet Stockholm, Sweden
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23
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Abi-Dargham A. A Dual Hit Model for Dopamine in Schizophrenia. Biol Psychiatry 2017; 81:2-4. [PMID: 27876155 DOI: 10.1016/j.biopsych.2016.10.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 10/08/2016] [Accepted: 10/11/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Anissa Abi-Dargham
- Department of Psychiatry, Stony Brook University, Stony Brook, New York.
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Murray RM, Quattrone D, Natesan S, van Os J, Nordentoft M, Howes O, Di Forti M, Taylor D. Should psychiatrists be more cautious about the long-term prophylactic use of antipsychotics? Br J Psychiatry 2016; 209:361-365. [PMID: 27802977 DOI: 10.1192/bjp.bp.116.182683] [Citation(s) in RCA: 144] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 07/30/2016] [Indexed: 12/19/2022]
Abstract
Patients who recover from an acute episode of psychosis are frequently prescribed prophylactic antipsychotics for many years, especially if they are diagnosed as having schizophrenia. However, there is a dearth of evidence concerning the long-term effectiveness of this practice, and growing concern over the cumulative effects of antipsychotics on physical health and brain structure. Although controversy remains concerning some of the data, the wise psychiatrist should regularly review the benefit to each patient of continuing prophylactic antipsychotics against the risk of side-effects and loss of effectiveness through the development of supersensitivity of the dopamine D2 receptor. Psychiatrists should work with their patients to slowly reduce the antipsychotic to the lowest dose that prevents the return of distressing symptoms. Up to 40% of those whose psychosis remits after a first episode should be able to achieve a good outcome in the long term either with no antipsychotic medication or with a very low dose.
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Affiliation(s)
- Robin M Murray
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - Diego Quattrone
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - Sridhar Natesan
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - Jim van Os
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - Merete Nordentoft
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - Oliver Howes
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - Marta Di Forti
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
| | - David Taylor
- Robin M. Murray, FRS, FRCPsych, Diego Quattrone, MD, Sridhar Natesan, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London. UK; Jim van Os, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, London, UK, and Department of Psychiatry and Psychology, Maastricht University Medical Center, The Netherlands; Merete Nordentoft, PhD, Mental Health Center, University of Copenhagen, Denmark; Oliver Howes, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, NIHR Maudsley Biomedical Research Centre, and MRC Clinical Sciences Centre, Imperial College London, London, UK; Marta Di Forti, PhD, MRCPsych, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK; David Taylor, PhD, King's College London, Institute of Psychiatry, Psychology and Neuroscience, and NIHR Maudsley Biomedical Research Centre, London, UK
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Gomes FV, Rincón-Cortés M, Grace AA. Adolescence as a period of vulnerability and intervention in schizophrenia: Insights from the MAM model. Neurosci Biobehav Rev 2016; 70:260-270. [PMID: 27235082 PMCID: PMC5074867 DOI: 10.1016/j.neubiorev.2016.05.030] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 05/24/2016] [Accepted: 05/24/2016] [Indexed: 11/30/2022]
Abstract
Adolescence is a time of extensive neuroanatomical, functional and chemical reorganization of the brain, which parallels substantial maturational changes in behavior and cognition. Environmental factors that impinge on the timing of these developmental factors, including stress and drug exposure, increase the risk for psychiatric disorders. Indeed, antecedents to affective and psychotic disorders, which have clinical and pathophysiological overlap, are commonly associated with risk factors during adolescence that predispose to these disorders. In the context of schizophrenia, psychosis typically begins in late adolescence/early adulthood, which has been replicated by animal models. Rats exposed during gestational day (GD) 17 to the mitotoxin methylazoxymethanol acetate (MAM) exhibit behavioral, pharmacological, and anatomical characteristics consistent with an animal model of schizophrenia. Here we provide an overview of adolescent changes within the dopamine system and the PFC and review recent findings regarding the effects of stress and cannabis exposure during the peripubertal period as risk factors for the emergence of schizophrenia-like deficits. Finally, we discuss peripubertal interventions appearing to circumvent the emergence of adult schizophrenia-like deficits.
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Affiliation(s)
- Felipe V Gomes
- Departments of Neuroscience, Psychiatry and Psychology, United States
| | | | - Anthony A Grace
- Departments of Neuroscience, Psychiatry and Psychology, United States.
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Grace AA. Dysregulation of the dopamine system in the pathophysiology of schizophrenia and depression. Nat Rev Neurosci 2016; 17:524-32. [PMID: 27256556 PMCID: PMC5166560 DOI: 10.1038/nrn.2016.57] [Citation(s) in RCA: 652] [Impact Index Per Article: 81.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The dopamine system is unique among the brain's modulatory systems in that it has discrete projections to specific brain regions involved in motor behaviour, cognition and emotion. Dopamine neurons exhibit several activity patterns - including tonic and phasic firing - that are determined by a combination of endogenous pacemaker conductances and regulation by multiple afferent systems. Emerging evidence suggests that disruptions in these regulatory systems may underlie the pathophysiology of several psychiatric disorders, including schizophrenia and depression.
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Affiliation(s)
- Anthony A Grace
- Departments of Neuroscience, Psychiatry and Psychology, Department of Neuroscience, A210 Langley Hall, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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