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Kim E, Redwood S, Liu F, Roche DJO, Chen S, Bentley WE, Eaton WW, Čiháková D, Talor MV, Kelly DL, Payne GF. Pilot study indicates that a gluten-free diet lowers oxidative stress for gluten-sensitive persons with schizophrenia. Schizophr Res 2024; 269:71-78. [PMID: 38749320 DOI: 10.1016/j.schres.2024.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 04/19/2024] [Accepted: 05/02/2024] [Indexed: 05/22/2024]
Abstract
One-third of people with schizophrenia have elevated levels of anti-gliadin antibodies (AGA IgG). A 5-week randomized double-blind pilot study was performed in 2014-2017 in an inpatient setting to test the effect of a gluten-free diet (GFD) on participants with schizophrenia or schizoaffective disorder who also had elevated AGA IgG (≥ 20 U) but were negative for celiac disease. This earlier pilot study reported that the GFD-group showed improved gastrointestinal and psychiatric symptoms, and also improvements in TNF-α and the inflammatory cytokine IL-23. Here, we performed measurements of these banked plasma samples to detect levels of oxidative stress (OxSt) using a recently developed iridium (Ir)-reducing capacity assay. Triplicate measurements of these samples showed an Intraclass Correlation Coefficient of 0.84 which indicates good reproducibility. Further, a comparison of the OxSt measurements at the baseline and 5-week end-point for this small sample size shows that the GFD-group (N = 7) had lowered OxSt levels compared to the gluten-containing diet group (GCD; N = 9; p = 0.05). Finally, we showed that improvements in OxSt over these 5 weeks were correlated to improvements in gastrointestinal (r = +0.64, p = 0.0073) and psychiatric (r = +0.52, p = 0.039) symptoms. Also, we showed a possible association between the decrease in OxSt and the lowered levels of IL-23 (r = +0.44, p = 0.087), although without statistical significance. Thus, the Ir-reducing capacity assay provides a simple, objective measure of OxSt with the results providing further evidence that inflammation, redox dysregulation and OxSt may mediate interactions between the gut and brain.
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Affiliation(s)
- Eunkyoung Kim
- Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, United States
| | - Sidney Redwood
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States
| | - Fang Liu
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, United States
| | - Daniel J O Roche
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, United States
| | - Shuo Chen
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, United States
| | - William E Bentley
- Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, United States; Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, United States
| | - William W Eaton
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, United States
| | - Daniela Čiháková
- Molecular Microbiology and Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, United States; Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD 21205, United States
| | - Monica V Talor
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD 21205, United States
| | - Deanna L Kelly
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, MD 21228, United States.
| | - Gregory F Payne
- Institute for Bioscience and Biotechnology Research, University of Maryland, College Park, MD 20742, United States; Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, United States.
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Papazoglou A, Henseler C, Weickhardt S, Daubner J, Schiffer T, Broich K, Hescheler J, Sachinidis A, Ehninger D, Haenisch B, Weiergräber M. Sex-specific cortical, hippocampal and thalamic whole genome transcriptome data from controls and a G72 schizophrenia mouse model. BMC Res Notes 2024; 17:143. [PMID: 38773625 PMCID: PMC11110308 DOI: 10.1186/s13104-024-06799-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Accepted: 05/07/2024] [Indexed: 05/24/2024] Open
Abstract
OBJECTIVES The G72 mouse model of schizophrenia represents a well-known model that was generated to meet the main translational criteria of isomorphism, homology and predictability of schizophrenia to a maximum extent. In order to get a more detailed view of the complex etiopathogenesis of schizophrenia, whole genome transcriptome studies turn out to be indispensable. Here we carried out microarray data collection based on RNA extracted from the retrosplenial cortex, hippocampus and thalamus of G72 transgenic and wild-type control mice. Experimental animals were age-matched and importantly, both sexes were considered separately. DATA DESCRIPTION The isolated RNA from all three brain regions was purified, quantified und quality controlled before initiation of the hybridization procedure with SurePrint G3 Mouse Gene Expression v2 8 × 60 K microarrays. Following immunofluorescent measurement und preprocessing of image data, raw transcriptome data from G72 mice and control animals were extracted and uploaded in a public database. Our data allow insight into significant alterations in gene transcript levels in G72 mice and enable the reader/user to perform further complex analyses to identify potential age-, sex- and brain-region-specific alterations in transcription profiles and related pathways. The latter could facilitate biomarker identification and drug research and development in schizophrenia research.
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Affiliation(s)
- Anna Papazoglou
- Experimental Neuropsychopharmacology, Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte, BfArM), Kurt Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
| | - Christina Henseler
- Experimental Neuropsychopharmacology, Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte, BfArM), Kurt Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
| | - Sandra Weickhardt
- Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte BfArM), Kurt-Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
| | - Johanna Daubner
- Experimental Neuropsychopharmacology, Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte, BfArM), Kurt Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
| | - Teresa Schiffer
- Experimental Neuropsychopharmacology, Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte, BfArM), Kurt Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
| | - Karl Broich
- Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte BfArM), Kurt-Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
| | - Jürgen Hescheler
- Faculty of Medicine, Institute of Neurophysiology, University of Cologne, Robert-Koch-Str. 39, Cologne, 50931, Germany
- Center of Physiology and Pathophysiology, Faculty of Medicine, University of Cologne, Robert-Koch-Str. 39, Cologne, 50931, Germany
| | - Agapios Sachinidis
- Faculty of Medicine, Institute of Neurophysiology, University of Cologne, Robert-Koch-Str. 39, Cologne, 50931, Germany
- Center of Physiology and Pathophysiology, Faculty of Medicine, University of Cologne, Robert-Koch-Str. 39, Cologne, 50931, Germany
| | - Dan Ehninger
- Translational Biogerontology, German Center for Neurodegenerative Diseases (Deutsches Zentrum für Neurodegenerative Erkrankungen, DZNE), Venusberg-Campus 1/99, Bonn, 53127, Germany
- German Center for Neurodegenerative Diseases (Deutsches Zentrum für Neurodegenerative Erkrankungen, DZNE), Venusberg-Campus 1/99, Bonn, 53127, Germany
| | - Britta Haenisch
- Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte BfArM), Kurt-Georg-Kiesinger-Allee 3, Bonn, 53175, Germany
- German Center for Neurodegenerative Diseases (Deutsches Zentrum für Neurodegenerative Erkrankungen, DZNE), Venusberg-Campus 1/99, Bonn, 53127, Germany
- Center for Translational Medicine, Medical Faculty, University of Bonn, Bonn, 53113, Germany
| | - Marco Weiergräber
- Experimental Neuropsychopharmacology, Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte, BfArM), Kurt Georg-Kiesinger-Allee 3, Bonn, 53175, Germany.
- Federal Institute for Drugs and Medical Devices (Bundesinstitut für Arzneimittel und Medizinprodukte BfArM), Kurt-Georg-Kiesinger-Allee 3, Bonn, 53175, Germany.
- Faculty of Medicine, Institute of Neurophysiology, University of Cologne, Robert-Koch-Str. 39, Cologne, 50931, Germany.
- Center of Physiology and Pathophysiology, Faculty of Medicine, University of Cologne, Robert-Koch-Str. 39, Cologne, 50931, Germany.
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Thomou C, Nussbaumer M, Grammenou E, Komini C, Vlaikou AM, Papageorgiou MP, Filiou MD. Early Handling Exerts Anxiolytic Effects and Alters Brain Mitochondrial Dynamics in Adult High Anxiety Mice. Mol Neurobiol 2024:10.1007/s12035-024-04116-5. [PMID: 38761326 DOI: 10.1007/s12035-024-04116-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Accepted: 03/09/2024] [Indexed: 05/20/2024]
Abstract
Early handling (EH), the brief separation of pups from their mother during early life, has been shown to exert beneficial effects. However, the impact of EH in a high anxiety background as well as the role of brain mitochondria in shaping EH-driven responses remain elusive.Here, we used a high (HAB) vs. normal (NAB) anxiety-related behavior mouse model to study how EH affects pup and dam behavior in divergent anxiety backgrounds. We also investigated EH-induced effects at the protein and mRNA levels in adult male HAB mice in the hypothalamus, the prefrontal cortex, and the hippocampus by examining the same mitochondrial/energy pathways and mitochondrial dynamics mechanisms (fission, fusion, biogenesis, and mitophagy) in all three brain regions.EH exerts anxiolytic effects in adult HAB but not NAB male mice and does not affect HAB or NAB maternal behavior, although basal HAB vs. NAB maternal behaviors differ. In adult HAB male mice, EH does not impact oxidative phosphorylation (OXPHOS) and oxidative stress in any of the brain regions studied but leads to increased protein expression of glycolysis enzymes and a correlation of anxiety-related behavior with Krebs cycle enzymes in HAB mice in the hypothalamus. Intriguingly, EH alters mitochondrial dynamics by increasing hypothalamic DRP1, OPA1, and PGC1a protein levels. At the mRNA level, we observe altered, EH-driven mitochondrial dynamics mRNA signatures which predominantly affect the prefrontal cortex.Taken together, our results show that EH exerts anxiolytic effects in adulthood in high anxiety and modulates mitochondrial dynamics pathways in a brain region-specific manner.
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Affiliation(s)
- Christina Thomou
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece
| | - Markus Nussbaumer
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece
| | - Eleni Grammenou
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece
| | - Chrysoula Komini
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece
| | - Angeliki-Maria Vlaikou
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece
| | - Maria P Papageorgiou
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece
| | - Michaela D Filiou
- Laboratory of Biochemistry, Department of Biological Applications and Technology, University of Ioannina, Ioannina, Greece.
- Biomedical Research Institute, Foundation for Research and Technology-Hellas (FORTH), Ioannina, Greece.
- Institute of Biosciences, University of Ioannina, Ioannina, Greece.
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Bühner LM, Kapanaiah SKT, Kätzel D. Chronic N-acetylcysteine treatment improves anhedonia and cognition in a mouse model of the schizophrenia prodrome. Front Behav Neurosci 2022; 16:1002223. [PMID: 36225391 PMCID: PMC9548602 DOI: 10.3389/fnbeh.2022.1002223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 09/07/2022] [Indexed: 11/13/2022] Open
Abstract
Schizophrenia is a severe psychiatric disorder whose neurodevelopmental pathogenesis includes a prodromal phase before its diagnostically decisive—namely psychotic—symptoms are present. This prodrome is characterized by cognitive and affective deficits, and it may constitute a critical time period for an early therapeutic intervention to improve or even prevent further disease development. N-acetylcysteine (NAC) is an easily repurposable compound that has recently shown promise in improving non-psychotic symptoms in patients with established schizophrenia. Its therapeutic mechanism may involve the amelioration of circuit abnormalities like a hyper-glutamatergic state and oxidative stress in cortex which have been proposed to drive the pathogenesis of this disease. However, it is currently unknown to what extent NAC can actually improve prodromal aberrations. To investigate this preclinically, we deployed the cyclin-D2 knockout mouse model (CD2-KO) that shares physiological and behavioral abnormalities with the schizophrenia prodrome, including a hyperactive CA1 region, and cognitive and affective deficits. Applying NAC chronically in drinking water (0.9 g/l) during development (∼P22–P70), we found that excessive novelty-induced hyperlocomotion was neither ameliorated during (∼P68) nor after (∼P75) treatment; similarly, T-maze working memory (tested after treatment; ∼P84) was unaffected. However, once chronic NAC treatment was resumed (at approximately P134) in those mice that had received it before, working memory, cognitive flexibility (tested under NAC), and anhedonia (sucrose-preference, tested 1 day after NAC-treatment stopped) were improved in CD2-KO mice. This suggests that chronic NAC treatment may be a therapeutic strategy to improve some cognitive and affective dysfunctions in the schizophrenia prodrome.
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Ni P, Ma Y, Chung S. Mitochondrial dysfunction in psychiatric disorders. Schizophr Res 2022:S0920-9964(22)00333-4. [PMID: 36175250 DOI: 10.1016/j.schres.2022.08.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 08/25/2022] [Accepted: 08/30/2022] [Indexed: 11/30/2022]
Abstract
Psychiatric disorders are a heterogeneous group of mental disorders with abnormal mental or behavioral patterns, which severely distress or disable affected individuals and can have a grave socioeconomic burden. Growing evidence indicates that mitochondrial function plays an important role in developing psychiatric disorders. This review discusses the neuropsychiatric consequences of mitochondrial abnormalities in both animal models and patients. We also discuss recent studies associated with compromised mitochondrial function in various psychiatric disorders, such as schizophrenia (SCZ), major depressive disorder (MD), and bipolar disorders (BD). These studies employ various approaches including postmortem studies, imaging studies, genetic studies, and induced pluripotent stem cells (iPSCs) studies. We also summarize the evidence from animal models and clinical trials to support mitochondrial function as a potential therapeutic target to treat various psychiatric disorders. This review will contribute to furthering our understanding of the metabolic etiology of various psychiatric disorders, and help guide the development of optimal therapies.
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Affiliation(s)
- Peiyan Ni
- The Psychiatric Laboratory and Mental Health Center, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China.
| | - Yao Ma
- The Psychiatric Laboratory and Mental Health Center, West China Hospital, Sichuan University, Chengdu 610041, People's Republic of China
| | - Sangmi Chung
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, NY 10595, USA.
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6
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Lopes-Rocha A, Bezerra TO, Zanotto R, Lages Nascimento I, Rodrigues A, Salum C. The Antioxidant N-Acetyl-L-Cysteine Restores the Behavioral Deficits in a Neurodevelopmental Model of Schizophrenia Through a Mechanism That Involves Nitric Oxide. Front Pharmacol 2022; 13:924955. [PMID: 35903343 PMCID: PMC9315304 DOI: 10.3389/fphar.2022.924955] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 05/25/2022] [Indexed: 11/24/2022] Open
Abstract
The disruption of neurodevelopment is a hypothesis for the emergence of schizophrenia. Some evidence supports the hypothesis that a redox imbalance could account for the developmental impairments associated with schizophrenia. Additionally, there is a deficit in glutathione (GSH), a main antioxidant, in this disorder. The injection of metilazoximetanol acetate (MAM) on the 17th day of gestation in Wistar rats recapitulates the neurodevelopmental and oxidative stress hypothesis of schizophrenia. The offspring of rats exposed to MAM treatment present in early adulthood behavioral and neurochemical deficits consistent with those seen in schizophrenia. The present study investigated if the acute and chronic (250 mg/kg) treatment during adulthood with N-acetyl-L-cysteine (NAC), a GSH precursor, can revert the behavioral deficits [hyperlocomotion, prepulse inhibition (PPI), and social interaction (SI)] in MAM rats and if the NAC-chronic-effects could be canceled by L-arginine (250 mg/kg, i.p, for 5 days), nitric oxide precursor. Analyses of markers involved in the inflammatory response, such as astrocytes (glial fibrillary acid protein, GFAP) and microglia (binding adapter molecule 1, Iba1), and parvalbumin (PV) positive GABAergic, were conducted in the prefrontal cortex [PFC, medial orbital cortex (MO) and prelimbic cortex (PrL)] and dorsal and ventral hippocampus [CA1, CA2, CA3, and dentate gyrus (DG)] in rats under chronic treatment with NAC. MAM rats showed decreased time of SI and increased locomotion, and both acute and chronic NAC treatments were able to recover these behavioral deficits. L-arginine blocked NAC behavioral effects. MAM rats presented increases in GFAP density at PFC and Iba1 at PFC and CA1. NAC increased the density of Iba1 cells at PFC and of PV cells at MO and CA1 of the ventral hippocampus. The results indicate that NAC recovered the behavioral deficits observed in MAM rats through a mechanism involving nitric oxide. Our data suggest an ongoing inflammatory process in MAM rats and support a potential antipsychotic effect of NAC.
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Murtas G, Pollegioni L, Molla G, Sacchi S. Biochemical Properties and Physiological Functions of pLG72: Twenty Years of Investigations. Biomolecules 2022; 12:biom12060858. [PMID: 35740983 PMCID: PMC9220908 DOI: 10.3390/biom12060858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 06/13/2022] [Accepted: 06/18/2022] [Indexed: 11/16/2022] Open
Abstract
In 2002, the novel human gene G72 was associated with schizophrenia susceptibility. This gene encodes a small protein of 153 amino acids, named pLG72, which represents a rare case of primate-specific protein. In particular, the rs2391191 single nucleotide polymorphism (resulting in in the R30K substitution) was robustly associated to schizophrenia and bipolar disorder. In this review, we aim to summarize the results of 20 years of biochemical investigations on pLG72. The main known role of pLG72 is related to its ability to bind and inactivate the flavoenzyme d-amino acid oxidase, i.e., the enzyme that controls the catabolism of d-serine, the main NMDA receptor coagonist in the brain. pLG72 was proposed to target the cytosolic form of d-amino acid oxidase for degradation, preserving d-serine and protecting the cell from oxidative stress generated by hydrogen peroxide produced by the flavoenzyme reaction. Anyway, pLG72 seems to play additional roles, such as affecting mitochondrial functions. The level of pLG72 in the human body is still a controversial issue because of its low expression and challenging detection. Anyway, the intriguing hypothesis that pLG72 level in blood could represent a suitable marker of Alzheimer’s disease progression (a suggestion not sufficiently established yet) merits further investigations.
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Multi-Omics Analysis Reveals Myelin, Presynaptic and Nicotinate Alterations in the Hippocampus of G72/G30 Transgenic Mice. J Pers Med 2022; 12:jpm12020244. [PMID: 35207732 PMCID: PMC8878587 DOI: 10.3390/jpm12020244] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/20/2022] [Accepted: 01/25/2022] [Indexed: 01/15/2023] Open
Abstract
The primate-specific G72/G30 gene locus has been associated with major psychiatric disorders, such as schizophrenia and bipolar disorder. We have previously generated transgenic mice which carry the G72/G30 locus and express the longest G72 splice variant (LG72) protein encoded by this locus with schizophrenia-related symptoms. Here, we used a multi-omics approach, including quantitative proteomics and metabolomics to investigate molecular alterations in the hippocampus of G72/G30 transgenic (G72Tg) mice. Our proteomics analysis revealed decreased expression of myelin-related proteins and NAD-dependent protein deacetylase sirtuin-2 (Sirt2) as well as increased expression of the scaffolding presynaptic proteins bassoon (Bsn) and piccolo (Pclo) and the cytoskeletal protein plectin (Plec1) in G72Tg compared to wild-type (WT) mice. Metabolomics analysis indicated decreased levels of nicotinate in G72Tg compared to WT hippocampi. Decreased hippocampal protein expression for selected proteins, namely myelin oligodentrocyte glycoprotein (Mog), Cldn11 and myelin proteolipid protein (Plp), was confirmed with Western blot in a larger population of G72Tg and WT mice. The identified molecular pathway alterations shed light on the hippocampal function of LG72 protein in the context of neuropsychiatric phenotypes.
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Thalamic reticular nucleus impairments and abnormal prefrontal control of dopamine system in a developmental model of schizophrenia: prevention by N-acetylcysteine. Mol Psychiatry 2021; 26:7679-7689. [PMID: 34193975 PMCID: PMC8716611 DOI: 10.1038/s41380-021-01198-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 06/10/2021] [Indexed: 02/06/2023]
Abstract
Recent evidence showed thalamic abnormalities in schizophrenia involving disruptions to the parvalbumin neurons in the thalamic reticular nucleus (TRN). However, their functional consequences, as well as a potential linkage to oxidative stress, are unclear. The TRN is posited to gate prefrontal control of dopamine neuron activity in the ventral tegmental area (VTA). Thus, we hypothesized that schizophrenia-related TRN abnormalities might contribute to dopamine dysregulation, a well-known feature of the disorder. To test this, in adult rats exposed prenatally to methylazoxymethanol acetate (MAM rats), oxidative impairments to the parvalbumin neurons in the anterior TRN were assessed by immunohistochemistry. Using in vivo electrophysiology, we investigated whether inactivation of the prefrontal cortex would produce differential effects on VTA dopamine neurons in MAM rats. We show that MAM rats displayed reduced markers of parvalbumin and wisteria floribunda agglutinin-labeled perineuronal nets, correlating with increased markers of oxidative stress (8-oxo-7, 8-dihydro-20-deoxyguanosine, and 3-nitrotyrosine). Moreover, MAM rats displayed heightened baseline and abnormal prefrontal control of VTA dopamine neuron activity, as tetrodotoxin-induced inactivation of the infralimbic prefrontal cortex decreased the dopamine population activity, contrary to the normal increase in controls. Such dopamine neuron dysregulation was recapitulated by enzymatic perineuronal net digestion in the TRN of normal rats. Furthermore, juvenile (postnatal day 11-25) antioxidant treatment (N-acetyl-cysteine, 900 mg/L drinking water) prevented all these impairments in MAM rats. Our findings suggest that early accumulation of oxidative stress in the TRN may shape the later onset of schizophrenia pathophysiology, highlighting redox regulation as a potential target for early intervention.
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d-Amino Acids and pLG72 in Alzheimer's Disease and Schizophrenia. Int J Mol Sci 2021; 22:ijms222010917. [PMID: 34681579 PMCID: PMC8535920 DOI: 10.3390/ijms222010917] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/01/2021] [Accepted: 10/06/2021] [Indexed: 01/02/2023] Open
Abstract
Numerous studies over the last several years have shown that d-amino acids, especially d-serine, have been related to brain and neurological disorders. Acknowledged neurological functions of d-amino acids include neurotransmission and learning and memory functions through modulating N-methyl-d-aspartate type glutamate receptors (NMDARs). Aberrant d-amino acids level and polymorphisms of genes related to d-amino acids metabolism are associated with neurodegenerative brain conditions. This review summarizes the roles of d-amino acids and pLG72, also known as d-amino acid oxidase activator, on two neurodegenerative disorders, schizophrenia and Alzheimer’s disease (AD). The scope includes the changes in d-amino acids levels, gene polymorphisms of G72 genomics, and the role of pLG72 on NMDARs and mitochondria in schizophrenia and AD. The clinical diagnostic value of d-amino acids and pLG72 and the therapeutic importance are also reviewed.
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11
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Unusual Bioactive Compounds with Antioxidant Properties in Adjuvant Therapy Supporting Cognition Impairment in Age-Related Neurodegenerative Disorders. Int J Mol Sci 2021; 22:ijms221910707. [PMID: 34639048 PMCID: PMC8509433 DOI: 10.3390/ijms221910707] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 09/29/2021] [Accepted: 09/30/2021] [Indexed: 12/29/2022] Open
Abstract
Cognitive function decline is strictly related to age, resulting in the loss of the ability to perform daily behaviors and is a fundamental clinical neurodegeneration symptom. It has been proven that an adequate diet, comprehensive nutrition, and a healthy lifestyle may significantly inhibit neurodegenerative processes, improving cognitive functions. Therefore, intensive research has been conducted on cognitive-enhancing treatment for many years, especially with substances of natural origin. There are several intervention programs aimed at improving cognitive functions in elderly adults. Cognitive functions depend on body weight, food consumed daily, the quality of the intestinal microflora, and the supplements used. The effectiveness in the prevention of dementia is particularly high before the onset of the first symptoms. The impact of diet and nutrition on age-associated cognitive decline is becoming a growing field as a vital factor that may be easily modified, and the effects may be observed on an ongoing basis. The paper presents a review of the latest preclinical and clinical studies on the influence of natural antioxidants on cognitive functions, with particular emphasis on neurodegenerative diseases. Nevertheless, despite the promising research results in animal models, the clinical application of natural compounds will only be possible after solving a few challenges.
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12
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Murray AJ, Rogers JC, Katshu MZUH, Liddle PF, Upthegrove R. Oxidative Stress and the Pathophysiology and Symptom Profile of Schizophrenia Spectrum Disorders. Front Psychiatry 2021; 12:703452. [PMID: 34366935 PMCID: PMC8339376 DOI: 10.3389/fpsyt.2021.703452] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 06/28/2021] [Indexed: 12/12/2022] Open
Abstract
Schizophrenia is associated with increased levels of oxidative stress, as reflected by an increase in the concentrations of damaging reactive species and a reduction in anti-oxidant defences to combat them. Evidence has suggested that whilst not the likely primary cause of schizophrenia, increased oxidative stress may contribute to declining course and poor outcomes associated with schizophrenia. Here we discuss how oxidative stress may be implicated in the aetiology of schizophrenia and examine how current understanding relates associations with symptoms, potentially via lipid peroxidation induced neuronal damage. We argue that oxidative stress may be a good target for future pharmacotherapy in schizophrenia and suggest a multi-step model of illness progression with oxidative stress involved at each stage.
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Affiliation(s)
- Alex J. Murray
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
| | - Jack C. Rogers
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
| | - Mohammad Zia Ul Haq Katshu
- Institute of Mental Health, Division of Mental Health and Neurosciences University of Nottingham, Nottingham, United Kingdom
- Nottinghamshire Healthcare National Health Service Foundation Trust, Nottingham, United Kingdom
| | - Peter F. Liddle
- Institute of Mental Health, Division of Mental Health and Neurosciences University of Nottingham, Nottingham, United Kingdom
| | - Rachel Upthegrove
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
- Early Intervention Service, Birmingham Women's and Children's National Health Service Foundation Trust, Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom
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13
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Ventriglio A, Bellomo A, Favale D, Bonfitto I, Vitrani G, Di Sabatino D, Cuozzo E, Di Gioia I, Mauro P, Giampaolo P, Alessandro V, De Berardis D. Oxidative Stress in the Early Stage of Psychosis. Curr Top Med Chem 2021; 21:1457-1470. [PMID: 34218786 DOI: 10.2174/1568026621666210701105839] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/25/2021] [Accepted: 05/05/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND In the past few decades, increasing evidence in the literature has appeared describing the role of the antioxidant defense system and redox signaling in the multifactorial pathophysiology of psychosis. It is of interest to clinicians and researchers alike that abnormalities of the antioxidant defense system are associated with alterations of cellular membranes, immune functions and neurotransmission, all of which have some clinical implications. METHODS This narrative review summarizes the evidence regarding oxidative stress in the early stages of psychosis. We included 136 peer-reviewed articles published from 2007 to 2020 on PubMed EMBASE, The Cochrane Library and Google Scholar. RESULTS Patients affected by psychotic disorders show a decreased level of non-enzymatic antioxidants, an increased level of lipid peroxides, nitric oxides, and a homeostatic imbalance of purine catabolism. In particular, a significantly reduced antioxidant defense has been described in the early onset first episode of psychosis, including reduced levels of glutathione. Also, it has been shown that a decreased basal low -antioxidant capacity correlates with cognitive deficits and negative symptoms, mostly related to glutamate-receptor hypofunction. In addition, atypical antipsychotic drugs seem to show significant antioxidant activity. These factors are critical in order to treat cases of first-onset psychosis effectively. CONCLUSION This systematic review indicates the importance that must be given to anti-oxidant defense systems.
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Affiliation(s)
- Antonio Ventriglio
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Antonello Bellomo
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Donato Favale
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Iris Bonfitto
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Giovanna Vitrani
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Dario Di Sabatino
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Edwige Cuozzo
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Ilaria Di Gioia
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Pettorruso Mauro
- Department of Neurosciences, Imaging and Clinical Sciences, Univerity of Chieti, Italy
| | - Perna Giampaolo
- Department of Biomedical Sciences, Humanitas University, Milan, Italy
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14
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Sulkshane P, Ram J, Thakur A, Reis N, Kleifeld O, Glickman MH. Ubiquitination and receptor-mediated mitophagy converge to eliminate oxidation-damaged mitochondria during hypoxia. Redox Biol 2021; 45:102047. [PMID: 34175667 PMCID: PMC8254004 DOI: 10.1016/j.redox.2021.102047] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/14/2021] [Accepted: 06/14/2021] [Indexed: 12/14/2022] Open
Abstract
The contribution of the Ubiquitin-Proteasome System (UPS) to mitophagy has been largely attributed to the E3 ubiquitin ligase Parkin. Here we show that in response to the oxidative stress associated with hypoxia or the hypoxia mimic CoCl2, the damaged and fragmented mitochondria are removed by Parkin-independent mitophagy. Mitochondria isolated from hypoxia or CoCl2-treated cells exhibited extensive ubiquitination, predominantly Lysine 48-linked and involves the degradation of key mitochondrial proteins such as the mitofusins MFN1/2, or the import channel component TOM20. Reflecting the critical role of mitochondrial protein degradation, proteasome inhibition blocked CoCl2-induced mitophagy. The five conserved ubiquitin-binding autophagy receptors (p62, NDP52, Optineurin, NBR1, TAX1BP1) were dispensable for the ensuing mitophagy, suggesting that the mitophagy step itself was independent of ubiquitination. Instead, the expression of two ubiquitin-independent mitophagy receptor proteins BNIP3 and NIX was induced by hypoxia or CoCl2-treatment followed by their recruitment to the oxidation-damaged mitochondria. By employing BNIP3/NIX double knockout and DRP1-null cell lines, we confirmed that mitochondrial clearance relies on DRP1-dependent mitochondrial fragmentation and BNIP3/NIX-mediated mitophagy. General antioxidants such as N-Acetyl Cysteine (NAC) or the mitochondria-specific Mitoquinone prevented HIF-1α stabilization, ameliorated hypoxia-related mitochondrial oxidative stress, and suppressed mitophagy. We conclude that the UPS and receptor-mediated autophagy converge to eliminate oxidation-damaged mitochondria. Mitochondria-derived ROS contributes to HIF-1α stabilization during hypoxia. Oxidation-induced mitophagy entails ubiquitin-dependent and -independent steps. PINK1/Parkin & Ub-binding receptors are dispensable for oxidation-induced mitophagy. DRP1-dependent fragmentation facilitates oxidation-induced mitophagy. BNIP3/NIX partake in hypoxia-induced mitophagy, independent of mitochondrial ubiquitination.
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Affiliation(s)
- Prasad Sulkshane
- The Faculty of Biology, Technion Israel Institute of Technology, Haifa, 32000, Israel
| | - Jonathan Ram
- The Faculty of Biology, Technion Israel Institute of Technology, Haifa, 32000, Israel
| | - Anita Thakur
- The Faculty of Biology, Technion Israel Institute of Technology, Haifa, 32000, Israel
| | - Noa Reis
- The Faculty of Biology, Technion Israel Institute of Technology, Haifa, 32000, Israel
| | - Oded Kleifeld
- The Faculty of Biology, Technion Israel Institute of Technology, Haifa, 32000, Israel
| | - Michael H Glickman
- The Faculty of Biology, Technion Israel Institute of Technology, Haifa, 32000, Israel.
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15
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Chang CY, Luo DZ, Pei JC, Kuo MC, Hsieh YC, Lai WS. Not Just a Bystander: The Emerging Role of Astrocytes and Research Tools in Studying Cognitive Dysfunctions in Schizophrenia. Int J Mol Sci 2021; 22:ijms22105343. [PMID: 34069523 PMCID: PMC8160762 DOI: 10.3390/ijms22105343] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/14/2021] [Accepted: 05/14/2021] [Indexed: 12/16/2022] Open
Abstract
Cognitive dysfunction is one of the core symptoms in schizophrenia, and it is predictive of functional outcomes and therefore useful for treatment targets. Rather than improving cognitive deficits, currently available antipsychotics mainly focus on positive symptoms, targeting dopaminergic/serotoninergic neurons and receptors in the brain. Apart from investigating the neural mechanisms underlying schizophrenia, emerging evidence indicates the importance of glial cells in brain structure development and their involvement in cognitive functions. Although the etiopathology of astrocytes in schizophrenia remains unclear, accumulated evidence reveals that alterations in gene expression and astrocyte products have been reported in schizophrenic patients. To further investigate the role of astrocytes in schizophrenia, we highlighted recent progress in the investigation of the effect of astrocytes on abnormalities in glutamate transmission and impairments in the blood–brain barrier. Recent advances in animal models and behavioral methods were introduced to examine schizophrenia-related cognitive deficits and negative symptoms. We also highlighted several experimental tools that further elucidate the role of astrocytes. Instead of focusing on schizophrenia as a neuron-specific disorder, an additional astrocytic perspective provides novel and promising insight into its causal mechanisms and treatment. The involvement of astrocytes in the pathogenesis of schizophrenia and other brain disorders is worth further investigation.
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Affiliation(s)
- Chia-Yuan Chang
- Department of Psychology, National Taiwan University, Taipei 10617, Taiwan; (C.-Y.C.); (D.-Z.L.); (J.-C.P.); (Y.-C.H.)
- Neurobiology and Cognitive Science Center, National Taiwan University, Taipei 10617, Taiwan;
| | - Da-Zhong Luo
- Department of Psychology, National Taiwan University, Taipei 10617, Taiwan; (C.-Y.C.); (D.-Z.L.); (J.-C.P.); (Y.-C.H.)
| | - Ju-Chun Pei
- Department of Psychology, National Taiwan University, Taipei 10617, Taiwan; (C.-Y.C.); (D.-Z.L.); (J.-C.P.); (Y.-C.H.)
| | - Ming-Che Kuo
- Neurobiology and Cognitive Science Center, National Taiwan University, Taipei 10617, Taiwan;
- Department of Neurology, National Taiwan University Hospital, Taipei 100225, Taiwan
| | - Yi-Chen Hsieh
- Department of Psychology, National Taiwan University, Taipei 10617, Taiwan; (C.-Y.C.); (D.-Z.L.); (J.-C.P.); (Y.-C.H.)
| | - Wen-Sung Lai
- Department of Psychology, National Taiwan University, Taipei 10617, Taiwan; (C.-Y.C.); (D.-Z.L.); (J.-C.P.); (Y.-C.H.)
- Neurobiology and Cognitive Science Center, National Taiwan University, Taipei 10617, Taiwan;
- Graduate Institute of Brain and Mind Sciences, National Taiwan University, Taipei 10617, Taiwan
- Correspondence: ; Tel.: +886-2-3366-3112; Fax: +886-2-3362-9909
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16
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Martínez-Banaclocha M. N-acetyl-cysteine in Schizophrenia: Potential Role on the Sensitive Cysteine Proteome. Curr Med Chem 2021; 27:6424-6439. [PMID: 33115390 DOI: 10.2174/0929867326666191015091346] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 09/11/2019] [Accepted: 10/02/2019] [Indexed: 12/14/2022]
Abstract
BACKGROUND N-acetyl-cysteine (NAC) has shown widespread utility in different psychiatric disorders, including a beneficial role in schizophrenic patients. Although the replenishment of glutathione and the antioxidant activity of NAC have been suggested as the mechanisms that improve such a wide range of disorders, none seems to be sufficiently specific to explain these intriguing effects. A sensitive cysteine proteome is emerging as a functional and structural network of interconnected Sensitive Cysteine-containing Proteins (SCCPs) that together with reactive species and the cysteine/ glutathione cycles can regulate the bioenergetic metabolism, the redox homeostasis and the cellular growth, differentiation and survival, acting through different pathways that are regulated by the same thiol radical in cysteine residues. OBJECTIVE Since this sensitive cysteine network has been implicated in the pathogenesis of Parkinson's and Alzheimer's diseases, I have reviewed if the proteins that play a role in schizophrenia can be classified as SCCPs. RESULTS The results show that the principal proteins playing a role in schizophrenia can be classified as SCCPs, suggesting that the sensitive cysteine proteome (cysteinet) is defective in this type of psychosis. CONCLUSION The present review proposes that there is a deregulation of the sensitive cysteine proteome in schizophrenia as the consequence of a functional imbalance among different SCCPs, which play different functions in neurons and glial cells. In this context, the role of NAC to restore and prevent schizophrenic disorders is discussed.
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17
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Blanco-Ayala T, Sathyasaikumar KV, Uys JD, Pérez-de-la-Cruz V, Pidugu LS, Schwarcz R. N-Acetylcysteine Inhibits Kynurenine Aminotransferase II. Neuroscience 2020; 444:160-169. [PMID: 32768617 DOI: 10.1016/j.neuroscience.2020.07.049] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 07/08/2020] [Accepted: 07/28/2020] [Indexed: 12/22/2022]
Abstract
The tryptophan metabolite kynurenic acid (KYNA) may play an important role in normal and abnormal cognitive processes, most likely by interfering with α7 nicotinic and NMDA receptor function. KYNA is formed from its immediate precursor kynurenine either by non-enzymatic oxidation or through irreversible transamination by kynurenine aminotransferases. In the mammalian brain, kynurenine aminotransferase II (KAT II) is the principal enzyme responsible for the neosynthesis of rapidly mobilizable KYNA, and therefore constitutes an attractive target for pro-cognitive interventions. N-acetylcysteine (NAC), a brain-penetrant drug with pro-cognitive efficacy in humans, has been proposed to exert its actions by increasing the levels of the anti-oxidant glutathione (GSH) in the brain. We report here that NAC, but not GSH, inhibits KAT II activity in brain tissue homogenates from rats and humans with IC50 values in the high micromolar to low millimolar range. With similar potency, the drug interfered with the de novo formation of KYNA in rat brain slices, and NAC was a competitive inhibitor of recombinant human KAT II (Ki: 450 μM). Furthermore, GSH failed to S-glutathionylate recombinant human KAT II treated with the dithiocarbamate drug disulfiram. Shown by microdialysis in the prefrontal cortex of rats treated with kynurenine (50 mg/kg, i.p.), peripheral administration of NAC (500 mg/kg, i.p., 120 and 60 min before the application of kynurenine) reduced KYNA neosynthesis by ∼50%. Together, these results suggest that NAC exerts its neurobiological effects at least in part by reducing cerebral KYNA formation via KAT II inhibition.
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Affiliation(s)
- T Blanco-Ayala
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA
| | - K V Sathyasaikumar
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA
| | - J D Uys
- Department of Cellular and Molecular Pharmacology and Experimental Therapeutics, Medical University of South Carolina, Charleston, SC, USA
| | - V Pérez-de-la-Cruz
- Laboratorio de Neurobioquimica y Conducta, Instituto Nacional de Neurología y Neurocirugía Manuel Velasco Suárez, S.S.A. Ciudad de México, Mexico
| | - L S Pidugu
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - R Schwarcz
- Maryland Psychiatric Research Center, Department of Psychiatry, University of Maryland School of Medicine, Baltimore, MD, USA.
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18
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Chunchai T, Keawtep P, Arinno A, Saiyasit N, Prus D, Apaijai N, Pratchayasakul W, Chattipakorn N, Chattipakorn SC. N-acetyl cysteine, inulin and the two as a combined therapy ameliorate cognitive decline in testosterone-deprived rats. Aging (Albany NY) 2020; 11:3445-3462. [PMID: 31160542 PMCID: PMC6594791 DOI: 10.18632/aging.101989] [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] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 05/20/2019] [Indexed: 12/13/2022]
Abstract
Our previous studies reported that testosterone-deprived rats developed cognitive decline as a result of increased brain oxidative stress, microglia hyperactivity, and hippocampal dysplasticity. In addition, gut dysbiosis occurred in these rats. Previous studies demonstrated that n-acetyl cysteine (NAC) and a prebiotic (inulin) improved cognition in several pathological conditions. However, its effects on cognition in the testosterone-deprived condition have never been investigated. This study hypothesized that the administration of NAC, inulin, and a combined therapy improved cognition in castrated rats. Here we report that metabolic disturbance was not observed in the ORX rats, but gut dysbiosis was found in these rats. ORX rats developed blood-brain-barrier (BBB) breakdown, and increased brain oxidative stress as indicated by increased hippocampal production of reactive oxygen species (ROS) and an increase in brain malondialdehyde level. ORX rats also demonstrated glia hyperactivation, resulting in hippocampal apoptosis, hippocampal dysplasticity, and cognitive decline. All treatments equally ameliorated cognitive decline by improving gut dysbiosis, alleviating BBB dysfunction, decreasing hippocampal ROS production, decreasing hippocampal apoptosis, and reducing microglia and astrocyte activity. These findings suggest that NAC, inulin, and the combined therapy ameliorated the deleterious effects on the brain in castrated male rats similar to those treated with testosterone.
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Affiliation(s)
- Titikorn Chunchai
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Puntarik Keawtep
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Apiwan Arinno
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Napatsorn Saiyasit
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Dillon Prus
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Nattayaporn Apaijai
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wasana Pratchayasakul
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Nipon Chattipakorn
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Cardiac Electrophysiology Unit, Department of Physiology Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Siriporn C Chattipakorn
- Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand.,Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand
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19
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Ni P, Chung S. Mitochondrial Dysfunction in Schizophrenia. Bioessays 2020; 42:e1900202. [PMID: 32338416 DOI: 10.1002/bies.201900202] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 02/29/2020] [Indexed: 02/05/2023]
Abstract
Schizophrenia (SCZ) is a severe neurodevelopmental disorder affecting 1% of populations worldwide with a grave disability and socioeconomic burden. Current antipsychotic medications are effective treatments for positive symptoms, but poorly address negative symptoms and cognitive symptoms, warranting the development of better treatment options. Further understanding of SCZ pathogenesis is critical in these endeavors. Accumulating evidence has pointed to the role of mitochondria and metabolic dysregulation in SCZ pathogenesis. This review critically summarizes recent studies associating a compromised mitochondrial function with people with SCZ, including postmortem studies, imaging studies, genetic studies, and induced pluripotent stem cell studies. This review also discusses animal models with mitochondrial dysfunction resulting in SCZ-relevant neurobehavioral abnormalities, as well as restoration of mitochondrial function as potential therapeutic targets. Further understanding of mitochondrial dysfunction in SCZ may open the door to develop novel therapeutic strategies that can address the symptoms that cannot be adequately addressed by current antipsychotics alone.
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Affiliation(s)
- Peiyan Ni
- Psychiatric Laboratory and Mental Health Center, The State Key Laboratory of Biotherapy, West China Hospital of Sichuan University, Chengdu, 610041, China
| | - Sangmi Chung
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, NY, 10595, USA
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20
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Kapoor MC. Neurological dysfunction after cardiac surgery and cardiac intensive care admission: A narrative review part 2: Cognitive dysfunction after critical illness; potential contributors in surgery and intensive care; pathogenesis; and therapies to prevent/treat perioperative neurological dysfunction. Ann Card Anaesth 2020; 23:391-400. [PMID: 33109793 PMCID: PMC7879886 DOI: 10.4103/aca.aca_139_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Severe cognitive decline and cognitive dysfunction has been attributed to patient's stay in the cardiovascular intensive care unit. Prolonged mechanical ventilation, long duration of stay, sedation protocols, and sleep deprivation contribute to patients developing neurocognitive disorder after intensive care admission and it is associated with poor clinical outcomes. Trauma of surgery, stress of critical care, and administration of anaesthesia evoke a systemic inflammatory response and trigger neuroinflammation and oxidative stress. Anaesthetic agents modulate the function of the GABA receptors. The persistence of these effects in the postoperative period promotes development of cognitive dysfunction. A number of drugs are under investigation to restrict or prevent this cognitive decline.
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Affiliation(s)
- Mukul C Kapoor
- Department of Anaesthesia, Max Smart Super Specialty Hospital, Saket, Delhi, India
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21
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Effect of N-acetyl cysteine (NAC) supplementation on positive and negative syndrome scale in schizophrenia: a systematic review and meta-analysis of randomised controlled trials. Eur J Clin Pharmacol 2018; 75:289-301. [PMID: 30446769 DOI: 10.1007/s00228-018-2595-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Accepted: 10/31/2018] [Indexed: 10/27/2022]
Abstract
OBJECTIVE To conduct a systematic review and meta-analysis of published randomised controlled trials on the efficacy of NAC supplementation on positive and negative syndrome scale in schizophrenia. METHODS A meta-analysis was conducted, and studies were identified by a search of electronic databases from inception to May 2018. Combined and stratified analyses were used. RESULTS Seven trials were identified, and data from n = 447 participants were included. Pooled analysis showed improvement of positive and negative syndrome scale following NAC treatment compared with placebo, for total (SMB = - 0.96) [95% CI - 1.69, - 0.24; P = 0.009], general (SMB = - 1.04) [95% CI - 1.80, - 0.27; P = 0.008] and negative (SMB = - 0.73) [95% CI - 1.29, - 0.17; P = 0.01] scores, respectively. Significant heterogeneity was found, and subgroup analysis showed significant reductions in studies with a treatment duration of ≤ 24 weeks, with a considerable effect size on total, general, and negative scores (Total SMD = - 0.83; General SMD = - 0.67; Negative SMD = - 1.09) following NAC. CONCLUSIONS NAC improved all aspects of positive and negative syndrome scale in schizophrenic populations and may be more efficacious with treatment durations up to 24 weeks.
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22
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Cornelis FMF, Monteagudo S, Guns LAKA, den Hollander W, Nelissen RGHH, Storms L, Peeters T, Jonkers I, Meulenbelt I, Lories RJ. ANP32A regulates ATM expression and prevents oxidative stress in cartilage, brain, and bone. Sci Transl Med 2018; 10:10/458/eaar8426. [DOI: 10.1126/scitranslmed.aar8426] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 03/12/2018] [Accepted: 07/31/2018] [Indexed: 12/13/2022]
Abstract
Osteoarthritis is the most common joint disorder with increasing global prevalence due to aging of the population. Current therapy is limited to symptom relief, yet there is no cure. Its multifactorial etiology includes oxidative stress and overproduction of reactive oxygen species, but the regulation of these processes in the joint is insufficiently understood. We report that ANP32A protects the cartilage against oxidative stress, preventing osteoarthritis development and disease progression. ANP32A is down-regulated in human and mouse osteoarthritic cartilage. Microarray profiling revealed that ANP32A protects the joint by promoting the expression of ATM, a key regulator of the cellular oxidative defense. Antioxidant treatment reduced the severity of osteoarthritis, osteopenia, and cerebellar ataxia features in Anp32a-deficient mice, revealing that the ANP32A/ATM axis discovered in cartilage is also present in brain and bone. Our findings indicate that modulating ANP32A signaling could help manage oxidative stress in cartilage, brain, and bone with therapeutic implications for osteoarthritis, neurological disease, and osteoporosis.
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Affiliation(s)
- Frederique M. F. Cornelis
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
| | - Silvia Monteagudo
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
| | - Laura-An K. A. Guns
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
| | - Wouter den Hollander
- Department of Medical Statistics and Bioinformatics, Section Molecular Epidemiology, Leiden University Medical Center, 2300 RC Leiden, Netherlands
- Integrated research on Developmental determinants of Ageing and Longevity (IDEAL), 2300 RC Leiden, Netherlands
| | - Rob G. H. H. Nelissen
- Department of Orthopaedics, Leiden University Medical Center, 2300 RC Leiden, Netherlands
| | - Lies Storms
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
| | - Tine Peeters
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
| | - Ilse Jonkers
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
- Human Movement Biomechanics, Department of Kinesiology, KU Leuven, 3000 Leuven, Belgium
| | - Ingrid Meulenbelt
- Department of Medical Statistics and Bioinformatics, Section Molecular Epidemiology, Leiden University Medical Center, 2300 RC Leiden, Netherlands
- Integrated research on Developmental determinants of Ageing and Longevity (IDEAL), 2300 RC Leiden, Netherlands
| | - Rik J. Lories
- Laboratory of Tissue Homeostasis and Disease, Skeletal Biology and Engineering Research Center, Department of Development and Regeneration, KU Leuven, 3000 Leuven, Belgium
- Division of Rheumatology, University Hospitals Leuven, 3000 Leuven, Belgium
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23
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Wang M, Saw HP, Cui FF, Lin SY, Chang HT, Chiu CD. pLG72 induces superoxide radicals via interaction and aggregation with SOD1. Free Radic Res 2018; 52:970-976. [PMID: 30037290 DOI: 10.1080/10715762.2018.1504293] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
G72 has been characterised as a susceptibility gene that can have wide-ranging effects in a number of neurodegenerative diseases, including schizophrenia and major depression. Indeed, its product, pLG72, is a potential serum biomarker for schizophrenia. Previous transcriptomic and biochemical studies have indicated that pLG72 may induce the production of mitochondrial reactive oxygen species (ROS), resulting in cell damage. Here, we investigated the mechanism of pLG72 by transfecting a human U87 glioblastoma cell line with a G72 construct. By employing ROS-specific scavengers, we discovered that superoxide radicals were specifically induced in the pLG72-expressing cells. We also found that pLG72 interacted and co-localised with superoxide dismutase 1 (SOD1), resulting in aggregation of SOD1 with a concomitant 23% or 74% reduction of total SOD activity, depending on the amount of G72 transfection plasmid. Finally, we found that transfection of U87 cells with the G72 construct caused a 29% decrease in cell proliferation. The observed loss of SOD1 function in pLG72-expressing cells may explain the elevated ROS levels and inhibition of U87 cell proliferation and has implications for understanding the onset of neurodegenerative diseases in humans.
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Affiliation(s)
- Maofeng Wang
- a Department of Biomedical Science Laboratory , Affiliated Dongyang Hospital of Wenzhou Medical University , Dongyang , Zhejiang , China
| | - Hean-Pat Saw
- b Institute of Medicine , Chung Shan Medical University , Taichung , Taiwan.,c Chung Kang Branch, Cheng Ching General Hospital , Taichung , Taiwan
| | - Fei-Fei Cui
- a Department of Biomedical Science Laboratory , Affiliated Dongyang Hospital of Wenzhou Medical University , Dongyang , Zhejiang , China
| | - Sheng-Yi Lin
- d School of Medicine, China Medical University , Taichung , Taiwan.,e Graduate Institute of Biomedical Science , China Medical University , Taichung , Taiwan.,f Stroke Center, China Medical University Hospital , Taichung , Taiwan
| | - Hao-Teng Chang
- a Department of Biomedical Science Laboratory , Affiliated Dongyang Hospital of Wenzhou Medical University , Dongyang , Zhejiang , China
| | - Cheng-Di Chiu
- d School of Medicine, China Medical University , Taichung , Taiwan.,e Graduate Institute of Biomedical Science , China Medical University , Taichung , Taiwan.,f Stroke Center, China Medical University Hospital , Taichung , Taiwan.,g Department of Neurosurgery , China Medical University Hospital , Taichung , Taiwan
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24
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Zheng W, Zhang QE, Cai DB, Yang XH, Qiu Y, Ungvari GS, Ng CH, Berk M, Ning YP, Xiang YT. N-acetylcysteine for major mental disorders: a systematic review and meta-analysis of randomized controlled trials. Acta Psychiatr Scand 2018; 137:391-400. [PMID: 29457216 DOI: 10.1111/acps.12862] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/25/2018] [Indexed: 12/18/2022]
Abstract
OBJECTIVE This systematic review and meta-analysis of randomized controlled trials (RCTs) examined the efficacy and safety of adjunctive N-acetylcysteine (NAC), an antioxidant drug, in treating major depressive disorder (MDD), bipolar disorder, and schizophrenia. METHODS The PubMed, Cochrane Library, PsycINFO, CNKI, CBM, and WanFang databases were independently searched and screened by two researchers. Standardized mean differences (SMDs), risk ratios, and their 95% confidence intervals (CIs) were computed. RESULTS Six RCTs (n = 701) of NAC for schizophrenia (three RCTs, n = 307), bipolar disorder (two RCTs, n = 125), and MDD (one RCT, n = 269) were identified and analyzed as separate groups. Adjunctive NAC significantly improved total psychopathology (SMD = -0.74, 95% CI: -1.43, -0.06; I2 = 84%, P = 0.03) in schizophrenia, but it had no significant effect on depressive and manic symptoms as assessed by the Young Mania Rating Scale in bipolar disorder and only a small effect on major depressive symptoms. Adverse drug reactions to NAC and discontinuation rates between the NAC and control groups were similar across the three disorders. CONCLUSIONS Adjunctive NAC appears to be a safe treatment that has efficacy for schizophrenia, but not for bipolar disorder or MDD. Further higher quality RCTs are warranted to determine the role of adjunctive NAC in the treatment of major psychiatric disorders.
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Affiliation(s)
- W Zheng
- The Affiliated Brain Hospital of Guangzhou Medical University (Guangzhou Huiai Hospital), Guangzhou, China
| | - Q-E Zhang
- The National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - D-B Cai
- Clinics of Chinese Medicine, the First Clinical Medical College of Guangzhou University of Chinese Medicine, Guangzhou, China
| | - X-H Yang
- The Affiliated Brain Hospital of Guangzhou Medical University (Guangzhou Huiai Hospital), Guangzhou, China
| | - Y Qiu
- The Affiliated Brain Hospital of Guangzhou Medical University (Guangzhou Huiai Hospital), Guangzhou, China
| | - G S Ungvari
- The University of Notre Dame Australia/Graylands Hospital, Perth, WA, Australia
| | - C H Ng
- Department of Psychiatry, University of Melbourne, Melbourne, Vic., Australia
| | - M Berk
- School of Medicine, IMPACT Strategic Research Centre, Barwon Health, Deakin University, Geelong, Vic., Australia.,Orygen, The Centre of Excellence in Youth Mental Health, Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, Vic., Australia
| | - Y-P Ning
- The Affiliated Brain Hospital of Guangzhou Medical University (Guangzhou Huiai Hospital), Guangzhou, China
| | - Y-T Xiang
- Unit of Psychiatry, Faculty of Health Sciences, University of Macau, Macao SAR, China
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25
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Schiavone S, Trabace L. The use of antioxidant compounds in the treatment of first psychotic episode: Highlights from preclinical studies. CNS Neurosci Ther 2018. [PMID: 29542255 DOI: 10.1111/cns.12847] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Recent evidence highlighted a pathogenetic link between redox dysregulation and the early stages of psychosis. Indeed, an increasing number of studies have pointed toward an association between oxidative stress, both at central and peripheral levels, and first psychotic episode. Moreover, basal low antioxidant capacity has been shown to directly correlate with cognitive impairment in the early onset of psychosis. In this context, the possibility to use antioxidant compounds in first psychotic episode, especially as supplementation to antipsychotic therapy, has become the focus of numerous investigations on rodents with the aim to translate data on the possible effects of antioxidant therapies to large populations of patients, with a diagnosis of the first psychotic episode. In this review, we will discuss studies, published from January 1st, 2007 to July 31st, 2017, investigating the effects of antioxidant compounds on neuropathological alterations observed in different rodent models characterized by a cluster of psychotic-like symptoms reminiscent of what observed in human first psychotic episode. A final focus on the effective possibility to directly translate data obtained on rodents to humans will be also provided.
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Affiliation(s)
- Stefania Schiavone
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Luigia Trabace
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
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26
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Sepehrmanesh Z, Heidary M, Akasheh N, Akbari H, Heidary M. Therapeutic effect of adjunctive N-acetyl cysteine (NAC) on symptoms of chronic schizophrenia: A double-blind, randomized clinical trial. Prog Neuropsychopharmacol Biol Psychiatry 2018; 82:289-296. [PMID: 29126981 DOI: 10.1016/j.pnpbp.2017.11.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Revised: 11/03/2017] [Accepted: 11/06/2017] [Indexed: 12/14/2022]
Abstract
BACKGROUND Schizophrenia is one of the most disabling psychiatric syndromes with the prevalence of 1% in the general population. Despite availability of various antipsychotics, negative symptoms and cognitive impairment are difficult to treat. In addition antipsychotic monotherapy is not effective in most of these patients. Current evidence indicates the roles of glutamatergic system in this disorder. N-acetyl cysteine (NAC) also increases extracellular glutamate. This study was conducted to evaluate the clinical effects of oral NAC as an add-on to maintenance medication for the treatment of chronic schizophrenia. MATERIALS AND METHODS This 12-week, double-blind, randomized, placebo-controlled, clinical trial was performed to determine the effectiveness of 1200mg N-acetyl cysteine as an adjunctive treatment with conventional antipsychotic medications in 84 patients with chronic schizophrenia. The subjects were evaluated with the Positive and Negative Syndrome Scale (PANSS), Mini-Mental State Examination (MMSE), and a standard neuropsychological screening test. Data were analyzed with SPSS-16 software. RESULTS NAC-treated patients showed significantly improvement in the positive (F=5.47, P=0.02) and negative (F=0.20, df=1) PANSS subscale. Also the general and total PANSS score of NAC group declined over times whilst it was increased for placebo group. Regarding cognitive functions, improvement was observed in some explored areas, such as attention, short-term and working memory, executive functioning and speed of processing. There was no significant difference between the 2 groups in the frequency of adverse effects. CONCLUSION The present study detected improvement in positive, negative, general and total psychopathology symptoms as well as cognitive performance with NAC treatment. It is also well-tolerated, safe and easy-to-use agent as an effective therapeutic strategy to improve outcome in schizophrenia treatment.
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Affiliation(s)
- Zahra Sepehrmanesh
- Department of psychiatry, School of Medicine, Kashan University of Medical Science, Kashan, Iran
| | - Mahsa Heidary
- Department of psychiatry, School of Medicine, Kashan University of Medical Science, Kashan, Iran.
| | - Negar Akasheh
- School of Medicine, Qazvin University of Medical Science, Qazvin, Iran
| | - Hossein Akbari
- Department of Public Health, Kashan University Of Medical Sciences, kashan, Iran
| | - Mahshid Heidary
- Department of Clinical Psychology, Qom Islamic Azad University, Qom, Iran.
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27
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Wang LJ, Lin PY, Lee Y, Huang YC, Wu CC, Hsu ST, Chen CC, Chong MY, Lin CH, Hung CF. Increased serum levels of cysteine in patients with schizophrenia: A potential marker of cognitive function preservation. Schizophr Res 2018; 192:391-397. [PMID: 28363347 DOI: 10.1016/j.schres.2017.03.041] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 03/22/2017] [Accepted: 03/22/2017] [Indexed: 01/24/2023]
Abstract
BACKGROUND Oxidative stress has been implicated in the psychopathology of schizophrenia. Cysteine, a semi-essential amino acid, is the precursor of the antioxidant glutathione. The aim of this study was to investigate the differences in serum levels of cysteine between patients with schizophrenia and healthy controls. The relationships between levels of cysteine, psychopathology and cognitive function were also explored. METHODS We recruited 65 patients with schizophrenia and 65 age- and gender-matched healthy controls. Blood samples were collected to determine the serum levels of cysteine and plasma levels of metabolic parameters. The cognitive function of participants was assessed using the Brief Assessment of Cognition in Schizophrenia (BACS). The psychopathology of schizophrenic patients was evaluated using the Positive and Negative Syndrome Scale. RESULTS Serum cysteine levels were significantly higher in schizophrenic patients than in controls (P<0.001). In patients with schizophrenia, serum levels of cysteine were positively correlated with cognitive function in terms of verbal memory (P=0.013), working memory (P=0.004), verbal fluency (P=0.027), attention and processing speed (P=0.025), executive function (P=0.024) and the composite score on the BACS (P=0.013). In healthy controls, no significant correlation was observed between cysteine level and cognitive function. CONCLUSIONS These findings suggest that oxidative stress may be involved in the pathogenesis of schizophrenia, and compensatory elevated levels of cysteine may serve as an indicator of cognition preservation. Further prospective studies are warranted to investigate the dynamic alterations in cysteine and the underlying pathophysiology of schizophrenia.
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Affiliation(s)
- Liang-Jen Wang
- Department of Child and Adolescent Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Pao-Yen Lin
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan; Institute for Translational Research in Biomedical Sciences, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Yu Lee
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Yu-Chi Huang
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chih-Ching Wu
- Department of Otolaryngology-Head & Neck Surgery, Linkuo Chang Gung Memorial Hospital, Taoyuan, Taiwan; Department of Medical Biotechnology and Laboratory Science, Chang Gung University, Tao-Yuan, Taiwan
| | - Su-Ting Hsu
- Kaohsiung Municipal Kai-Syuan Psychiatric Hospital, Taiwan
| | - Chien-Chih Chen
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Mian-Yoon Chong
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chieh-Hsin Lin
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | - Chi-Fa Hung
- Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
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28
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Shankle WR, Hara J, Barrentine LW, Curole MV. CerefolinNAC Therapy of Hyperhomocysteinemia Delays Cortical and White Matter Atrophy in Alzheimer's Disease and Cerebrovascular Disease. J Alzheimers Dis 2018; 54:1073-1084. [PMID: 27567825 DOI: 10.3233/jad-160241] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We examined whether using a medical food therapy for hyperhomocysteinemia (HHcy) in patients with Alzheimer's disease (AD) or cognitive impairment due to cerebrovascular disease (CVD) with Cerefolin®/CerefolinNAC® (CFLN: L-methylfolate, methylcobalamin, and N-acetyl-cysteine) slowed regional brain atrophy. Thirty HHcy patients with AD and related disorders (ADRD) received CFLN (HHcy+CFLN: duration [μ ± σ] = 18.6±16.1 months); a sub-sample of this group did not receive CFLN for varying periods of time (HHcy+NoCFLN: duration [μ ± σ] = 12.6±5.6 months). Thirty-seven NoHHcy patients with ADRD did not receive CFLN (NoHHcy+NoCFLN: duration [μ ± σ] = 13.3±17.7 months). No participant took supplemental B vitamins. Regional brain volumes were measured at baseline and end of study, and covariate-adjusted rates of hippocampal, cortical, and forebrain parenchymal (includes white matter) atrophy were predicted. The HHcy+CFLN group's hippocampal and cortical atrophy adjusted rates were 4.25 and 11.2 times slower than those of the NoHHcy+NoCFLN group (p < 0.024). The HHcy+CFLN group's forebrain parenchyma atrophy rate was significantly slower only for CVD; the rate of slowing was proportional to the degree of homocysteine lowering (p < 0.0001). CFLN was associated with significantly slowed hippocampal and cortical atrophy rates in ADRD patients with HHcy, and forebrain parenchymal atrophy rates in CVD patients with HHcy. The present results should be further validated.
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Affiliation(s)
- William R Shankle
- Medical Care Corporation, Newport Beach, CA, USA.,Shankle Clinic, Newport Beach, CA, USA.,Memory and Cognitive Disorders Program, Neurosciences Institute, Hoag Memorial Hospital Presbyterian, Newport Beach, CA, USA.,Department of Cognitive Sciences, University of California, Irvine, Irvine, CA, USA
| | - Junko Hara
- Medical Care Corporation, Newport Beach, CA, USA.,Shankle Clinic, Newport Beach, CA, USA
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29
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Pollegioni L, Piubelli L, Molla G, Rosini E. D-Amino Acid Oxidase-pLG72 Interaction and D-Serine Modulation. Front Mol Biosci 2018; 5:3. [PMID: 29417050 PMCID: PMC5787542 DOI: 10.3389/fmolb.2018.00003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Accepted: 01/08/2018] [Indexed: 12/30/2022] Open
Abstract
pLG72 is a small, primate-specific protein of 153 amino acids. It is the product of the G72 gene, expressed in testis, spinal cord, and brain. The presence of G72 transcript and pLG72 has recurrently been called into question, however G72 mRNA and pLG72 protein levels were higher in blood and brain of patients with schizophrenia than in healthy controls. On the one hand, the SNP rs2391191 corresponding to the R30K substitution in pLG72 was genetically linked to schizophrenia, reduced thickness of the brain cortex in schizophrenia-affected individuals, and altered memory function. Various lines of evidence indicated that pLG72 is a mitochondrial protein, specifically an extrinsic protein bound on the outer membrane. Over the years, pLG72 was proposed to be involved in different functions: (a) overexpression induces mitochondria fragmentation, increasing the numbers of shorter and more mobile ones which could be delivered faster to regions of intense growth and facilitating the dendritic complexity; (b) it might induce oxidative stress by interacting with methionine-R-sulfoxide reductase B2; and (c) it binds and modulates the activity of FMN-containing oxidoreductase of the respiratory complex I. The main role of this protein, however, is related to its binding to the human flavoenzyme D-amino acid oxidase (hDAAO), i.e., the main catabolic enzyme for D-enantiomer of serine. This D-amino acid is a main endogenous coagonist of the N-methyl-D-aspartate type glutamate receptor (NMDAR) involved in main functions such as synaptic plasticity, learning, memory, and excitotoxicity. For this work, we reviewed the recent literature concerning the hDAAO-pLG72 interaction, focusing on the molecular details of the interaction, the effect of hDAAO function and stability, and the cellular effects, especially on D-serine concentration. The main effects related to the pathological R30K substitution are also reported. We have highlighted the gaps in our knowledge of this human protein as well as the relevance of clarifying the molecular details of hDAAO-pLG72 interaction in order to design molecules to modulate hDAAO activity/stability and thus NMDAR function acting at the D-serine cellular level.
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Affiliation(s)
- Loredano Pollegioni
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli studi dell'Insubria, Milan, Italy
| | - Luciano Piubelli
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli studi dell'Insubria, Milan, Italy
| | - Gianluca Molla
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli studi dell'Insubria, Milan, Italy
| | - Elena Rosini
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli studi dell'Insubria, Milan, Italy
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30
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Chronic N-acetylcysteine treatment alleviates acute lipopolysaccharide-induced working memory deficit through upregulating caveolin-1 and synaptophysin in mice. Psychopharmacology (Berl) 2018; 235:179-191. [PMID: 29058042 DOI: 10.1007/s00213-017-4762-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 09/27/2017] [Indexed: 12/30/2022]
Abstract
RATIONALE Working memory (WM) is a dynamic encoding process and an active representation of information over a short time. The ability to guide forthcoming behavior would be disrupted if WM was impaired by various factors including inflammation, stress, free radicals, and disease states such as schizophrenia. However, the mechanism underlying acute working memory impairment remains to be defined. OBJECTIVES In this study, we tested the hypothesis that decreased caveolin-1 (Cav-1) and synaptophysin (SYP) accounted for the WM impairment challenged with acute intraperitoneally lipopolysaccharide (LPS), which mimicked neuroinflammation. Delayed alternation T-maze task (DAT) was used to assess working memory of adult male C57BL/6 mice, and western blot and immunostaining were used to detect protein expression and distribution in medial prefrontal cortex (mPFC) and hippocampus. RESULTS Our results showed that LPS dose-dependently induced working memory deficit accompanied by the decrease of Cav-1 and SYP in mPFC but not hippocampus. In addition, LPS significantly decreased protein level of Cav-1 and SYP in neurons by activating microglia cells. More important, 2-week N-acetylcysteine (NAC) treatment dose-dependently inhibited LPS-induced working memory deficit by improving the ability to use Lose-shift but not Win-shift strategy and significantly inhibited LPS-induced downregulation of Cav-1 and SYP in mPFC. CONCLUSIONS Taken together, our findings demonstrate that chronic NAC treatment alleviates acute LPS-induced working memory deficit through upregulating Cav-1 and SYP in mice.
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31
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Lin E, Lin CH, Lai YL, Huang CH, Huang YJ, Lane HY. Combination of G72 Genetic Variation and G72 Protein Level to Detect Schizophrenia: Machine Learning Approaches. Front Psychiatry 2018; 9:566. [PMID: 30459659 PMCID: PMC6232512 DOI: 10.3389/fpsyt.2018.00566] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 10/18/2018] [Indexed: 11/15/2022] Open
Abstract
The D-amino acid oxidase activator (DAOA, also known as G72) gene is a strong schizophrenia susceptibility gene. Higher G72 protein levels have been implicated in patients with schizophrenia. The current study aimed to differentiate patients with schizophrenia from healthy individuals using G72 single nucleotide polymorphisms (SNPs) and G72 protein levels by leveraging computational artificial intelligence and machine learning tools. A total of 149 subjects with 89 patients with schizophrenia and 60 healthy controls were recruited. Two G72 genotypes (including rs1421292 and rs2391191) and G72 protein levels were measured with the peripheral blood. We utilized three machine learning algorithms (including logistic regression, naive Bayes, and C4.5 decision tree) to build the optimal predictive model for distinguishing schizophrenia patients from healthy controls. The naive Bayes model using two factors, including G72 rs1421292 and G72 protein, appeared to be the best model for disease susceptibility (sensitivity = 0.7969, specificity = 0.9372, area under the receiver operating characteristic curve (AUC) = 0.9356). However, a model integrating G72 rs1421292 only slightly increased the discriminative power than a model with G72 protein alone (sensitivity = 0.7941, specificity = 0.9503, AUC = 0.9324). Among the three models with G72 protein alone, the naive Bayes with G72 protein alone had the best specificity (0.9503), while logistic regression with G72 protein alone was the most sensitive (0.8765). The findings remained similar after adjusting for age and gender. This study suggests that G72 protein alone, without incorporating the two G72 SNPs, may have been suitable enough to identify schizophrenia patients. We also recommend applying both naive Bayes and logistic regression models for the best specificity and sensitivity, respectively. Larger-scale studies are warranted to confirm the findings.
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Affiliation(s)
- Eugene Lin
- Department of Electrical & Computer Engineering, University of Washington, Seattle, WA, United States.,Department of Biostatistics, University of Washington, Seattle, WA, United States.,Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
| | - Chieh-Hsin Lin
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan.,Department of Psychiatry, Kaohsiung Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Kaohsiung, Taiwan.,School of Medicine, Chang Gung University, Taoyuan, Taiwan
| | - Yi-Lun Lai
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
| | - Chiung-Hsien Huang
- Department of Medicine Research, China Medical University Hospital, Taichung, Taiwan
| | - Yu-Jhen Huang
- Department of Psychiatry, China Medical University Hospital, Taichung, Taiwan
| | - Hsien-Yuan Lane
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan.,Department of Psychiatry, China Medical University Hospital, Taichung, Taiwan.,Brain Disease Research Center, China Medical University Hospital, Taichung, Taiwan.,Department of Psychology, College of Medical and Health Sciences, Asia University, Taichung, Taiwan
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32
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Skvarc DR, Berk M, Byrne LK, Dean OM, Dodd S, Lewis M, Marriott A, Moore EM, Morris G, Page RS, Gray L. Post-Operative Cognitive Dysfunction: An exploration of the inflammatory hypothesis and novel therapies. Neurosci Biobehav Rev 2017; 84:116-133. [PMID: 29180259 DOI: 10.1016/j.neubiorev.2017.11.011] [Citation(s) in RCA: 190] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 10/16/2017] [Accepted: 11/20/2017] [Indexed: 12/11/2022]
Abstract
Post-Operative Cognitive Dysfunction (POCD) is a highly prevalent condition with significant clinical, social and financial impacts for patients and their communities. The underlying pathophysiology is becoming increasingly understood, with the role of neuroinflammation and oxidative stress secondary to surgery and anaesthesia strongly implicated. This review aims to describe the putative mechanisms by which surgery-induced inflammation produces cognitive sequelae, with a focus on identifying potential novel therapies based upon their ability to modify these pathways.
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Affiliation(s)
- David R Skvarc
- School of Psychology, Deakin University, Melbourne, Australia; Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia.
| | - Michael Berk
- Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia; Orygen, The National Centre of Excellence in Youth Mental Health, The Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia.
| | - Linda K Byrne
- School of Psychology, Deakin University, Melbourne, Australia.
| | - Olivia M Dean
- Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia; Orygen, The National Centre of Excellence in Youth Mental Health, The Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia
| | - Seetal Dodd
- Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia
| | - Matthew Lewis
- School of Psychology, Deakin University, Melbourne, Australia; Aged Psychiatry Service, Caulfield Hospital, Alfred Health, Caulfield, Australia
| | - Andrew Marriott
- Department of Anaesthesia, Perioperative Medicine & Pain Management, Barwon Health, Geelong, Australia; Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia; Orygen, The National Centre of Excellence in Youth Mental Health, The Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia
| | - Eileen M Moore
- Department of Anaesthesia, Perioperative Medicine & Pain Management, Barwon Health, Geelong, Australia; Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia
| | | | - Richard S Page
- Deakin University, School of Medicine, Geelong, Australia; Department of Orthopaedics, Barwon Health, Geelong, Australia
| | - Laura Gray
- Deakin University, School of Medicine, Geelong, Australia.
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33
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Jagannath V, Brotzakis ZF, Parrinello M, Walitza S, Grünblatt E. Controversial Effects of D-Amino Acid Oxidase Activator (DAOA)/G72 on D-Amino Acid Oxidase (DAO) Activity in Human Neuronal, Astrocyte and Kidney Cell Lines: The N-methyl D-aspartate (NMDA) Receptor Hypofunction Point of View. Front Mol Neurosci 2017; 10:342. [PMID: 29114206 PMCID: PMC5660716 DOI: 10.3389/fnmol.2017.00342] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Accepted: 10/10/2017] [Indexed: 12/23/2022] Open
Abstract
Dysfunction of D-amino acid oxidase (DAO) and DAO activator (DAOA)/G72 genes have been linked to neuropsychiatric disorders. The glutamate hypothesis of schizophrenia has proposed that increased DAO activity leads to decreased D-serine, which subsequently may lead to N-methyl-D-aspartate (NMDA) receptor hypofunction. It has been shown that DAOA binds to DAO and increases its activity. However, there are also studies showing DAOA decreases DAO activity. Thus, the effect of DAOA on DAO is controversial. We aimed to understand the effect of DAOA on DAO activity in neuron-like (SH-SY5Y), astrocyte-like (1321N1) and kidney-like (HEK293) human cell lines. DAO activity was measured based on the release of hydrogen peroxide and its interaction with Amplex Red reagent. We found that DAOA increases DAO activity only in HEK293 cells, but has no effect on DAO activity in SH-SY5Y and 1321N1 cells. This might be because of different signaling pathways, or due to lower DAO and DAOA expression in SH-SY5Y and 1321N1 cells compared to HEK293 cells, but also due to different compartmentalization of the proteins. The lower DAO and DAOA expression in neuron-like SH-SY5Y and astrocyte-like 1321N1 cells might be due to tightly regulated expression, as previously reported in the human post-mortem brain. Our simulation experiments to demonstrate the interaction between DAOA and human DAO (hDAO) showed that hDAO holoenzyme [hDAO with flavine adenine dinucleotide (FAD)] becomes more flexible and misfolded in the presence of DAOA, whereas DAOA had no effect on hDAO apoprotein (hDAO without FAD), which indicate that DAOA inactivates hDAO holoenzyme. Furthermore, patch-clamp analysis demonstrated no effect of DAOA on NMDA receptor activity in NR1/NR2A HEK293 cells. In summary, the interaction between DAO and DAOA seems to be cell type and its biochemical characteristics dependent which still needs to be elucidated.
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Affiliation(s)
- Vinita Jagannath
- Molecular and Neurobiochemistry Laboratory, Centre for Child and Adolescent Psychiatry Research, Department of Child and Adolescent Psychiatry and Psychotherapy, University Hospital of Psychiatry Zurich, University of Zurich, Zurich, Switzerland
| | - Zacharias Faidon Brotzakis
- Department of Chemistry and Applied Biosciences, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland.,Faculty of Informatics, Institute of Computational Science, Università della Svizzera Italiana (USI), Lugano, Switzerland
| | - Michele Parrinello
- Department of Chemistry and Applied Biosciences, Eidgenössische Technische Hochschule (ETH) Zurich, Zurich, Switzerland.,Faculty of Informatics, Institute of Computational Science, Università della Svizzera Italiana (USI), Lugano, Switzerland
| | - Susanne Walitza
- Molecular and Neurobiochemistry Laboratory, Centre for Child and Adolescent Psychiatry Research, Department of Child and Adolescent Psychiatry and Psychotherapy, University Hospital of Psychiatry Zurich, University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Edna Grünblatt
- Molecular and Neurobiochemistry Laboratory, Centre for Child and Adolescent Psychiatry Research, Department of Child and Adolescent Psychiatry and Psychotherapy, University Hospital of Psychiatry Zurich, University of Zurich, Zurich, Switzerland.,Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland.,Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
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Barron H, Hafizi S, Mizrahi R. Towards an Integrated View of Early Molecular Changes Underlying Vulnerability to Social Stress in Psychosis. MODERN TRENDS IN PHARMACOPSYCHIATRY 2017; 31:96-106. [PMID: 28738349 DOI: 10.1159/000470810] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Psychotic disorders are heterogeneous and complex, involving many putative causal factors interacting along the course of disease development. Many of the factors implicated in the pathogenesis of psychosis also appear to be involved in disease onset and subsequent neuroprogression. Herein, we highlight the pertinent literature implicating inflammation and oxidative stress in the pathogenesis of psychosis, and the potential contribution of N-methyl-D-aspartate receptors (NMDARs). We also emphasize the role of peripubertal social stress in psychosis, and the ways in which hippocampal dysfunction can mediate dysregulation of the hypothalamic-pituitary-adrenal axis and cortisol release. Finally, we propose a model wherein inflammation and oxidative stress act as a first hit, producing altered parvalbumin interneuron development, NMDAR hypofunction, microglial priming, and sensitivity to a second hit of peripubertal social stress. With a greater understanding of how these factors interact, it may be possible to detect, prevent, and treat psychosis more effectively.
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Kato Y, Fukui K. Structure models of G72, the product of a susceptibility gene to schizophrenia. J Biochem 2017; 161:223-230. [PMID: 27815320 DOI: 10.1093/jb/mvw064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 10/07/2016] [Indexed: 11/15/2022] Open
Abstract
The G72 gene is one of the most susceptible genes to schizophrenia and is contained exclusively in the genomes of primates. The product of the G72 gene modulates the activity of D-amino acid oxidase (DAO) and is a small protein prone to aggregate, which hampers its structural studies. In addition, lack of a known structure of a homologue makes it difficult to use the homology modelling method for the prediction of the structure. Thus, we first developed a hybrid ab initio approach for small proteins prior to the prediction of the structure of G72. The approach uses three known ab initio algorithms. To evaluate the hybrid approach, we tested our prediction of the structure of the amino acid sequences whose structures were already solved and compared the predicted structures with the experimentally solved structures. Based on these comparisons, the average accuracy of our approach was calculated to be ∼5 Å. We then applied the approach to the sequence of G72 and successfully predicted the structures of the N- and C-terminal domains (ND and CD, respectively) of G72. The predicted structures of ND and CD were similar to membrane-bound proteins and adaptor proteins, respectively.
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Affiliation(s)
- Yusuke Kato
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, Tokushima 770-8503, Japan
| | - Kiyoshi Fukui
- Division of Enzyme Pathophysiology, Institute for Enzyme Research, Tokushima University, Tokushima 770-8503, Japan
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Lopes S, Teplytska L, Vaz-Silva J, Dioli C, Trindade R, Morais M, Webhofer C, Maccarrone G, Almeida OFX, Turck CW, Sousa N, Sotiropoulos I, Filiou MD. Tau Deletion Prevents Stress-Induced Dendritic Atrophy in Prefrontal Cortex: Role of Synaptic Mitochondria. Cereb Cortex 2017; 27:2580-2591. [PMID: 27073221 DOI: 10.1093/cercor/bhw057] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Tau protein in dendrites and synapses has been recently implicated in synaptic degeneration and neuronal malfunction. Chronic stress, a well-known inducer of neuronal/synaptic atrophy, triggers hyperphosphorylation of Tau protein and cognitive deficits. However, the cause-effect relationship between these events remains to be established. To test the involvement of Tau in stress-induced impairments of cognition, we investigated the impact of stress on cognitive behavior, neuronal structure, and the synaptic proteome in the prefrontal cortex (PFC) of Tau knock-out (Tau-KO) and wild-type (WT) mice. Whereas exposure to chronic stress resulted in atrophy of apical dendrites and spine loss in PFC neurons as well as significant impairments in working memory in WT mice, such changes were absent in Tau-KO animals. Quantitative proteomic analysis of PFC synaptosomal fractions, combined with transmission electron microscopy analysis, suggested a prominent role for mitochondria in the regulation of the effects of stress. Specifically, chronically stressed animals exhibit Tau-dependent alterations in the levels of proteins involved in mitochondrial transport and oxidative phosphorylation as well as in the synaptic localization of mitochondria in PFC. These findings provide evidence for a causal role of Tau in mediating stress-elicited neuronal atrophy and cognitive impairment and indicate that Tau may exert its effects through synaptic mitochondria.
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Affiliation(s)
- Sofia Lopes
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | | | - Joao Vaz-Silva
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Chrysoula Dioli
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Rita Trindade
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Monica Morais
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Christian Webhofer
- Max Planck Institute of Psychiatry, 80804 Munich, Germany.,Current address: Sandoz Biopharmaceuticals, 82041 Oberhaching, Germany
| | | | | | | | - Nuno Sousa
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
| | - Ioannis Sotiropoulos
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, 4710-057 Braga, Portugal.,ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães 4710-057, Portugal
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Skvarc DR, Dean OM, Byrne LK, Gray L, Lane S, Lewis M, Fernandes BS, Berk M, Marriott A. The effect of N-acetylcysteine (NAC) on human cognition - A systematic review. Neurosci Biobehav Rev 2017; 78:44-56. [PMID: 28438466 DOI: 10.1016/j.neubiorev.2017.04.013] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 04/13/2017] [Accepted: 04/15/2017] [Indexed: 12/15/2022]
Abstract
Oxidative stress, neuroinflammation and neurogenesis are commonly implicated as cognitive modulators across a range of disorders. N-acetylcysteine (NAC) is a glutathione precursor with potent antioxidant, pro-neurogenesis and anti-inflammatory properties and a favourable safety profile. A systematic review of the literature specifically examining the effect of NAC administration on human cognition revealed twelve suitable articles for inclusion: four examining Alzheimer's disease; three examining healthy participants; two examining physical trauma; one examining bipolar disorder, one examining schizophrenia, and one examining ketamine-induced psychosis. Heterogeneity of studies, insufficiently powered studies, infrequency of cognition as a primary outcome, heterogeneous methodologies, formulations, co-administered treatments, administration regimes, and assessment confounded the drawing of firm conclusions. The available data suggested statistically significant cognitive improvements following NAC treatment, though the paucity of NAC-specific research makes it difficult to determine if this effect is meaningful. While NAC may have a positive cognitive effect in a variety of contexts; larger, targeted studies are warranted, specifically evaluating its role in other clinical disorders with cognitive sequelae resulting from oxidative stress and neuroinflammation.
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Affiliation(s)
- David R Skvarc
- School of Psychology, Deakin University, Melbourne, Australia; Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia
| | - Olivia M Dean
- Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia; Orygen, The National Centre of Excellence in Youth Mental Health, the Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, the University of Melbourne, Parkville, Australia
| | - Linda K Byrne
- School of Psychology, Deakin University, Melbourne, Australia
| | - Laura Gray
- Deakin University, School of Medicine, Geelong, Australia
| | - Stephen Lane
- Deakin University, School of Medicine, Geelong, Australia; Biostatistics Unit, Barwon Health, Geelong, Australia
| | - Matthew Lewis
- School of Psychology, Deakin University, Melbourne, Australia; Aged Psychiatry Service, Caulfield Hospital, Alfred Health, Caulfield, Australia
| | - Brisa S Fernandes
- Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Laboratory of Calcium Binding Proteins in the Central Nervous System, Department of Biochemistry, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Michael Berk
- Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia; Orygen, The National Centre of Excellence in Youth Mental Health, the Department of Psychiatry and the Florey Institute of Neuroscience and Mental Health, the University of Melbourne, Parkville, Australia
| | - Andrew Marriott
- Department of Anaesthesia, Perioperative Medicine & Pain Management, Barwon Health, Geelong, Australia; Deakin University, Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Barwon Health, Geelong, Australia; Deakin University, School of Medicine, Geelong, Australia.
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38
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Rapado-Castro M, Dodd S, Bush AI, Malhi GS, Skvarc DR, On ZX, Berk M, Dean OM. Cognitive effects of adjunctive N-acetyl cysteine in psychosis. Psychol Med 2017; 47:866-876. [PMID: 27894373 DOI: 10.1017/s0033291716002932] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Cognitive deficits are predictors of functional outcome in patients with psychosis. While conventional antipsychotics are relatively effective on positive symptoms, their impact on negative and cognitive symptoms is limited. Recent studies have established a link between oxidative stress and neurocognitive deficits in psychosis. N-acetylcysteine (NAC), a glutathione precursor with glutamatergic properties, has shown efficacy on negative symptoms and functioning in patients with schizophrenia and bipolar disorder, respectively. However, there are few evidence-based approaches for managing cognitive impairment in psychosis. The present study aims to examine the cognitive effects of adjunctive NAC treatment in a pooled subgroup of participants with psychosis who completed neuropsychological assessment in two trials of both schizophrenia and bipolar disorder. METHOD A sample of 58 participants were randomized in a double fashion to receive 2 g/day of NAC (n = 27) or placebo (n = 31) for 24 weeks. Attention, working memory and executive function domains were assessed. Differences between cognitive performance at baseline and end point were examined using Wilcoxon's test. The Mann-Whitney test was used to examine the differences between the NAC and placebo groups at the end point. RESULTS Participants treated with NAC had significantly higher working memory performance at week 24 compared with placebo (U = 98.5, p = 0.027). CONCLUSIONS NAC may have an impact on cognitive performance in psychosis, as a significant improvement in working memory was observed in the NAC-treated group compared with placebo; however, these preliminary data require replication. Glutamatergic compounds such as NAC may constitute a step towards the development of useful therapies for cognitive impairment in psychosis.
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Affiliation(s)
- M Rapado-Castro
- Child and Adolescent Psychiatry Department,Hospital General Universitario Gregorio Marañón,School of Medicine,Universidad Complutense,IiSGM,CIBERSAM,Madrid,Spain
| | - S Dodd
- Deakin University, IMPACT Strategic Research Centre, School of Medicine,Barwon Health,PO Box 291,Geelong,Victoria,Australia
| | - A I Bush
- Department of Psychiatry,University of Melbourne,Level 1 North,Main Block,Royal Melbourne Hospital,Parkville,Victoria,Australia
| | - G S Malhi
- Academic Department of Psychiatry,Kolling Institute,Northern Sydney Local Health District,St Leonards,NSW,Australia
| | - D R Skvarc
- Deakin University, IMPACT Strategic Research Centre, School of Medicine,Barwon Health,PO Box 291,Geelong,Victoria,Australia
| | - Z X On
- Melbourne School of Psychological Sciences,University of Melbourne,Level 12,Redmond Barry Building 115,Parkville,Victoria,Australia
| | - M Berk
- Orygen, The National Centre of Excellence in Youth Mental Health,Victoria,Australia
| | - O M Dean
- Deakin University, IMPACT Strategic Research Centre, School of Medicine,Barwon Health,PO Box 291,Geelong,Victoria,Australia
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Neuroinflammation and Oxidative Stress in Psychosis and Psychosis Risk. Int J Mol Sci 2017; 18:ijms18030651. [PMID: 28304340 PMCID: PMC5372663 DOI: 10.3390/ijms18030651] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 03/07/2017] [Accepted: 03/15/2017] [Indexed: 12/18/2022] Open
Abstract
Although our understanding of psychotic disorders has advanced substantially in the past few decades, very little has changed in the standard of care for these illnesses since the development of atypical anti-psychotics in the 1990s. Here, we integrate new insights into the pathophysiology with the increasing interest in early detection and prevention. First, we explore the role of N-methyl-d-aspartate receptors in a subpopulation of cortical parvalbumin-containing interneurons (PVIs). Postmortem and preclinical data has implicated these neurons in the positive and negative symptoms, as well as the cognitive dysfunction present in schizophrenia. These neurons also appear to be sensitive to inflammation and oxidative stress during the perinatal and peripubertal periods, which may be mediated in large part by aberrant synaptic pruning. After exploring some of the molecular mechanisms through which neuroinflammation and oxidative stress are thought to exert their effects, we highlight the progress that has been made in identifying psychosis prior to onset through the identification of individuals at clinical high risk for psychosis (CHR). By combining our understanding of psychosis pathogenesis with the increasing characterization of endophenotypes that precede frank psychosis, it may be possible to identify patients before they present with psychosis and intervene to reduce the burden of the disease to both patients and families.
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40
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Sacchi S, Cappelletti P, Pirone L, Smaldone G, Pedone E, Pollegioni L. Elucidating the role of the pLG72 R30K substitution in schizophrenia susceptibility. FEBS Lett 2017; 591:646-655. [PMID: 28166363 DOI: 10.1002/1873-3468.12585] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 01/24/2017] [Accepted: 01/28/2017] [Indexed: 12/31/2022]
Abstract
In the human brain, pLG72 interacts with the flavoenzyme d-amino acid oxidase (hDAAO), which is involved in catabolism of d-serine, a co-agonist of N-methyl-d-aspartate receptors (NMDAR). Here, we investigated the wild-type pLG72, the R30K variant associated with schizophrenia susceptibility, and the K62E variant. The protein conformation, oligomeric state, ligand-, and hDAAO-binding properties are only slightly modified by the substitutions. All pLG72 variants inhibit hDAAO and lead to an increase in cellular (d/d+l)-serine. However, the R30K pLG72 is significantly more prone to degradation than the R30 and the K62E variants in a cell system, thus possessing a lower ability to interact/inhibit hDAAO. This links R30K pLG72 with the hyperactivity of hDAAO, the decreased d-serine level, and NMDAR hypofunction observed in schizophrenia-affected patients.
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Affiliation(s)
- Silvia Sacchi
- Department of Biotechnology and Life Sciences, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli Studi dell'Insubria, Italy
| | - Pamela Cappelletti
- Department of Biotechnology and Life Sciences, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli Studi dell'Insubria, Italy
| | - Luciano Pirone
- Institute of Biostructures and Bioimaging, Italian Research National Council, Naples, Italy
| | | | - Emilia Pedone
- Institute of Biostructures and Bioimaging, Italian Research National Council, Naples, Italy
| | - Loredano Pollegioni
- Department of Biotechnology and Life Sciences, Università degli Studi dell'Insubria, Varese, Italy.,The Protein Factory, Politecnico di Milano and Università degli Studi dell'Insubria, Italy
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Zhang D, Jin B, Ondrejcak T, Rowan MJ. Opposite in vivo effects of agents that stimulate or inhibit the glutamate/cysteine exchanger system xc- on the inhibition of hippocampal LTP by Aß. Hippocampus 2016; 26:1655-1665. [PMID: 27701797 DOI: 10.1002/hipo.22667] [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] [Accepted: 09/21/2016] [Indexed: 01/17/2023]
Abstract
Aggregated amyloid ß-protein (Aß) is pathognomonic of Alzheimer's disease and certain assemblies of Aß are synaptotoxic. Excess glutamate or diminished glutathione reserve are both implicated in mediating or modulating Aß-induced disruption of synaptic plasticity. The system xc- antiporter promotes Na+ -independent exchange of cystine with glutamate thereby providing a major source of extracellular glutamate and intracellular glutathione concentrations. Here we probed the ability of two drugs with opposite effects on system xc-, the inhibitor sulfasalazine and facilitator N-acetylcysteine, to modulate the ability of Aß1-42 to inhibit long-term potentiation (LTP) in the CA1 area of the anaesthetized rat. Whereas acute systemic treatment with sulfasalazine lowered the threshold for Aß to interfere with synaptic plasticity, N-acetylcysteine prevented the inhibition of LTP by Aß alone or in combination with sulfasalazine. Moreover acute N-acetylcysteine also prevented the inhibition of LTP by TNFα, a putative mediator of Aß actions, and repeated systemic N-acetylcysteine treatment for 7 days reversed the delayed deleterious effect of Aß on LTP. Since both of these drugs are widely used clinically, further evaluation of their potential beneficial and deleterious actions in early Alzheimer's disease seems warranted. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Dainan Zhang
- Department of Pharmacology and Therapeutics, and Trinity College Institute of Neuroscience, Trinity College, Dublin 2, Ireland.,Department of Neurosurgery, the First Affiliated Hospital of Xinxiang Medical University, Weihui, 453100, China
| | - Baozhe Jin
- Department of Neurosurgery, the First Affiliated Hospital of Xinxiang Medical University, Weihui, 453100, China
| | - Tomas Ondrejcak
- Department of Pharmacology and Therapeutics, and Trinity College Institute of Neuroscience, Trinity College, Dublin 2, Ireland
| | - Michael J Rowan
- Department of Pharmacology and Therapeutics, and Trinity College Institute of Neuroscience, Trinity College, Dublin 2, Ireland
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42
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Hwang CS, Tsai CH, Liu GT, Li W, Chang HT. Decreased level of serum autoantibody against LG72 is a biosignature of amyotrophic lateral sclerosis. Biomark Med 2016; 10:73-9. [PMID: 26673967 DOI: 10.2217/bmm.15.80] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
AIM LG72 can increase mitochondrial ROSs and oxidative stress has been implicated in the pathophysiology of amyotrophic lateral sclerosis (ALS). The serum level of LG72 or LG72-related molecules might therefore be associated with ALS. Here, we aim to determine the serum autoantibody against LG72 has potential as a biomarker for the diagnosis of ALS. MATERIALS Seventy-eighty patients with ALS, 45 patients with AD, 43 patients with PD and 88 healthy adults were enrolled. RESULTS The concentration of serum autoantibody against LG72 was more than fourfold lower in ALS than other control groups (p < 0.001). The AUC was 0.9627 when the cut-off value for autoantibody concentration was 0.167 μg/ml. CONCLUSION This finding suggests that the autoantibody against LG72 might serve as a surrogate biomarker for ALS.
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Affiliation(s)
- Chi-Shin Hwang
- School of Medicine, National Yang Ming University, Taipei, Taiwan.,Department of Neurology, Taipei City Hospital - Zhong Xiao Branch, Taipei, Taiwan
| | - Chon-Haw Tsai
- Department of Neurology, China Medical University Hospital, Taichung, Taiwan
| | - Guan-Ting Liu
- Graduate Institute of Basic Medical Science and PhD Program for Aging, China Medical University, Taichung, Taiwan
| | - Weimin Li
- Department of Internal Medicine, Affiliated Dongyang Hospital of Wenzhou Medical University, Dongyang, Zhejiang, China
| | - Hao-Teng Chang
- Graduate Institute of Basic Medical Science and PhD Program for Aging, China Medical University, Taichung, Taiwan.,Department of Computer Science & Information Engineering, Asia University, Taichung, Taiwan
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Steullet P, Cabungcal JH, Monin A, Dwir D, O'Donnell P, Cuenod M, Do KQ. Redox dysregulation, neuroinflammation, and NMDA receptor hypofunction: A "central hub" in schizophrenia pathophysiology? Schizophr Res 2016; 176:41-51. [PMID: 25000913 PMCID: PMC4282982 DOI: 10.1016/j.schres.2014.06.021] [Citation(s) in RCA: 171] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 06/06/2014] [Accepted: 06/08/2014] [Indexed: 12/18/2022]
Abstract
Accumulating evidence points to altered GABAergic parvalbumin-expressing interneurons and impaired myelin/axonal integrity in schizophrenia. Both findings could be due to abnormal neurodevelopmental trajectories, affecting local neuronal networks and long-range synchrony and leading to cognitive deficits. In this review, we present data from animal models demonstrating that redox dysregulation, neuroinflammation and/or NMDAR hypofunction (as observed in patients) impairs the normal development of both parvalbumin interneurons and oligodendrocytes. These observations suggest that a dysregulation of the redox, neuroimmune, and glutamatergic systems due to genetic and early-life environmental risk factors could contribute to the anomalies of parvalbumin interneurons and white matter in schizophrenia, ultimately impacting cognition, social competence, and affective behavior via abnormal function of micro- and macrocircuits. Moreover, we propose that the redox, neuroimmune, and glutamatergic systems form a "central hub" where an imbalance within any of these "hub" systems leads to similar anomalies of parvalbumin interneurons and oligodendrocytes due to the tight and reciprocal interactions that exist among these systems. A combination of vulnerabilities for a dysregulation within more than one of these systems may be particularly deleterious. For these reasons, molecules, such as N-acetylcysteine, that possess antioxidant and anti-inflammatory properties and can also regulate glutamatergic transmission are promising tools for prevention in ultra-high risk patients or for early intervention therapy during the first stages of the disease.
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Affiliation(s)
- P Steullet
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Site de Cery, 1008 Prilly-Lausanne, Switzerland
| | - J H Cabungcal
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Site de Cery, 1008 Prilly-Lausanne, Switzerland
| | - A Monin
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Site de Cery, 1008 Prilly-Lausanne, Switzerland
| | - D Dwir
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Site de Cery, 1008 Prilly-Lausanne, Switzerland
| | - P O'Donnell
- Neuroscience Research Unit, Pfizer, Inc., 700 Main Street, Cambridge, MA 02139, USA
| | - M Cuenod
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Site de Cery, 1008 Prilly-Lausanne, Switzerland
| | - K Q Do
- Center for Psychiatric Neuroscience, Department of Psychiatry, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Site de Cery, 1008 Prilly-Lausanne, Switzerland.
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Skvarc DR, Dean OM, Byrne LK, Gray LJ, Ives K, Lane SE, Lewis M, Osborne C, Page R, Stupart D, Turner A, Berk M, Marriott AJ. The Post-Anaesthesia N-acetylcysteine Cognitive Evaluation (PANACEA) trial: study protocol for a randomised controlled trial. Trials 2016; 17:395. [PMID: 27502769 PMCID: PMC4977889 DOI: 10.1186/s13063-016-1529-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 07/26/2016] [Indexed: 12/18/2022] Open
Abstract
Background Some degree of cognitive decline after surgery occurs in as many as one quarter of elderly surgical patients, and this decline is associated with increased morbidity and mortality. Cognition may be affected across a range of domains, including memory, psychomotor skills, and executive function. Whilst the exact mechanisms of cognitive change after surgery are not precisely known, oxidative stress and subsequent neuroinflammation have been implicated. N-acetylcysteine (NAC) acts via multiple interrelated mechanisms to influence oxidative homeostasis, neuronal transmission, and inflammation. NAC has been shown to reduce oxidative stress and inflammation in both human and animal models. There is clinical evidence to suggest that NAC may be beneficial in preventing the cognitive decline associated with both acute physiological insults and dementia-related disorders. To date, no trials have examined perioperative NAC as a potential moderator of postoperative cognitive changes in the noncardiac surgery setting. Methods and design This is a single-centre, randomised, double-blind, placebo-controlled clinical trial, with a between-group, repeated-measures, longitudinal design. The study will recruit 370 noncardiac surgical patients at the University Hospital Geelong, aged 60 years or older. Participants are randomly assigned to receive either NAC or placebo (1:1 ratio), and groups are stratified by age and surgery type. Participants undergo a series of neuropsychological tests prior to surgery, 7 days, 3 months, and 12 months post surgery. It is hypothesised that the perioperative administration of NAC will reduce the degree of postoperative cognitive changes at early and long-term follow-up, as measured by changes on individual measures of the neurocognitive battery, when compared with placebo. Serum samples are taken on the day of surgery and on day 2 post surgery to quantitate any changes in levels of biomarkers of inflammation and oxidative stress. Discussion The PANACEA trial aims to examine the potential efficacy of perioperative NAC to reduce the severity of postoperative cognitive dysfunction in an elderly, noncardiac surgery population. This is an entirely novel approach to the prevention of postoperative cognitive dysfunction and will have high impact and translatable outcomes if NAC is found to be beneficial. Trial registration The PANACEA trial has been registered with the Therapeutic Goods Administration, and the Australian New Zealand Clinical Trials Registry: ACTRN12614000411640; registered on 15 April 2014. Electronic supplementary material The online version of this article (doi:10.1186/s13063-016-1529-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- David R Skvarc
- School of Psychology, Deakin University, 221 Burwood Highway, Burwood, 3215, VIC, Australia.,Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Deakin University/Barwon Health Clinical School, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.,School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia
| | - Olivia M Dean
- Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Deakin University/Barwon Health Clinical School, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.,School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia
| | - Linda K Byrne
- School of Psychology, Deakin University, 221 Burwood Highway, Burwood, 3215, VIC, Australia
| | - Laura J Gray
- School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia
| | - Kathryn Ives
- Department of Anaesthesia, Perioperative Medicine and Pain Management, Barwon Health, Bellarine Street, Geelong, 3220, VIC, Australia
| | - Stephen E Lane
- School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.,Biostatistics Unit, Barwon Health, Bellarine Street, Geelong, 3220, VIC, Australia
| | - Matthew Lewis
- Aged Psychiatry Service, Caulfield Hospital, Alfred Health, 260 Kooyong Road, Caulfield, 3162, Victoria, Australia
| | - Cameron Osborne
- Department of Anaesthesia, Perioperative Medicine and Pain Management, Barwon Health, Bellarine Street, Geelong, 3220, VIC, Australia
| | - Richard Page
- School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.,Barwon Orthopaedic Research Unit, Bellarine Street, Geelong, 3220, VIC, Australia
| | - Douglas Stupart
- Department of General Surgery, Barwon Health, Bellarine Street, Geelong, 3220, VIC, Australia
| | - Alyna Turner
- Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Deakin University/Barwon Health Clinical School, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.,School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia
| | - Michael Berk
- Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Deakin University/Barwon Health Clinical School, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.,School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia
| | - Andrew J Marriott
- Department of Anaesthesia, Perioperative Medicine and Pain Management, Barwon Health, Bellarine Street, Geelong, 3220, VIC, Australia. .,Innovations in Mental and Physical Health and Clinical Treatment (IMPACT) Strategic Research Centre, Deakin University/Barwon Health Clinical School, Pigdons Road, Waurn Ponds, 3216, VIC, Australia. .,School of Medicine, Deakin University, Pigdons Road, Waurn Ponds, 3216, VIC, Australia.
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Sethi S, Chourasia D, Parhar IS. Approaches for targeted proteomics and its potential applications in neuroscience. J Biosci 2016; 40:607-27. [PMID: 26333406 DOI: 10.1007/s12038-015-9537-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An extensive guide on practicable and significant quantitative proteomic approaches in neuroscience research is important not only because of the existing overwhelming limitations but also for gaining valuable understanding into brain function and deciphering proteomics from the workbench to the bedside. Early methodologies to understand the functioning of biological systems are now improving with high-throughput technologies, which allow analysis of various samples concurrently, or of thousand of analytes in a particular sample. Quantitative proteomic approaches include both gel-based and non-gel-based methods that can be further divided into different labelling approaches. This review will emphasize the role of existing technologies, their advantages and disadvantages, as well as their applications in neuroscience. This review will also discuss advanced approaches for targeted proteomics using isotope-coded affinity tag (ICAT) coupled with laser capture microdissection (LCM) followed by liquid chromatography tandem mass spectrometric (LC-MS/MS) analysis. This technology can further be extended to single cell proteomics in other areas of biological sciences and can be combined with other 'omics' approaches to reveal the mechanism of a cellular alterations. This approach may lead to further investigation in basic biology, disease analysis and surveillance, as well as drug discovery. Although numerous challenges still exist, we are confident that this approach will increase the understanding of pathological mechanisms involved in neuroendocrinology, neuropsychiatric and neurodegenerative disorders by delivering protein biomarker signatures for brain dysfunction.
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Affiliation(s)
- Sumit Sethi
- Brain Research Institute, Jeffrey Cheah School of Medicine and Health Sciences, MONASH University, Selangor Darul Ehsan, Malaysia,
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Sacchi S, Binelli G, Pollegioni L. G72 primate-specific gene: a still enigmatic element in psychiatric disorders. Cell Mol Life Sci 2016; 73:2029-39. [PMID: 26914235 PMCID: PMC11108296 DOI: 10.1007/s00018-016-2165-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 01/19/2016] [Accepted: 02/15/2016] [Indexed: 01/12/2023]
Abstract
Numerous studies have demonstrated a link between genetic markers on chromosome 13 and schizophrenia, bipolar affective disorder, and other psychiatric phenotypes. The G72/G30 genes (transcribed in opposite directions) are located on chromosome 13q33, a region demonstrating strong evidence for linkage with various neuropsychiatric disorders. G72/G30 was identified in 2002 as a schizophrenia susceptibility locus; however, subsequent association studies did not reach consensus on single SNPs within the locus. Simultaneously, a new vision for the genetic architecture of psychiatric disorders suggested that schizophrenia was a quantitative trait, therefore ascribable to potentially hundreds of genes and subjected to the vagaries of the environment. The main protein product of G72 gene is named pLG72 or D-amino acid oxidase activator DAOA (153 amino acids) and its function is still debated. Functional analyses, also showing controversial results, indicate that pLG72 contributes to N-methyl-D-aspartate receptor modulation by affecting activity of the flavoprotein D-amino acid oxidase, the enzyme responsible for degrading the neuromodulator D-serine. In this review we, for the first time, summarize findings from molecular genetic linkage and association studies concerning G72 gene, cellular and molecular studies on pLG72, and investigations performed on G72/G30 transgenic mice. This will help elucidate the role of psychosis susceptibility genes, which will have a major impact on our understanding of disease pathophysiology and thus change classification and treatment.
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Affiliation(s)
- Silvia Sacchi
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli studi dell'Insubria, via J. H. Dunant 3, 21100, Varese, Italy
- The Protein Factory, Centro Interuniversitario di Biotecnologie Proteiche, Università degli studi dell'Insubria and Politecnico di Milano, Milano, Italy
| | - Giorgio Binelli
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli studi dell'Insubria, via J. H. Dunant 3, 21100, Varese, Italy
| | - Loredano Pollegioni
- Dipartimento di Biotecnologie e Scienze della Vita, Università degli studi dell'Insubria, via J. H. Dunant 3, 21100, Varese, Italy.
- The Protein Factory, Centro Interuniversitario di Biotecnologie Proteiche, Università degli studi dell'Insubria and Politecnico di Milano, Milano, Italy.
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Synaptic and cellular changes induced by the schizophrenia susceptibility gene G72 are rescued by N-acetylcysteine treatment. Transl Psychiatry 2016; 6:e807. [PMID: 27163208 PMCID: PMC5070069 DOI: 10.1038/tp.2016.74] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 02/19/2016] [Accepted: 03/20/2016] [Indexed: 12/15/2022] Open
Abstract
Genetic studies have linked the primate-specific gene locus G72 to the development of schizophrenia and bipolar disorder. Transgenic mice carrying the entire gene locus express G72 mRNA in dentate gyrus (DG) and entorhinal cortex, causing altered electrophysiological properties of their connections. These transgenic mice exhibit behavioral alterations related to psychiatric diseases, including cognitive deficits that can be reversed by treatment with N-acetylcysteine, which was also found to be effective in human patients. Here, we show that G72 transgenic mice have larger excitatory synapses with an increased amount of N-methyl-d-aspartate (NMDA) receptors in the molecular layer of DG, compared with wild-type littermates. Furthermore, transgenic animals have lower number of dentate granule cells with a parallel, but an even stronger decrease in the number of excitatory synapses in the molecular layer. Importantly, we also show that treatment with N-acetylcysteine can effectively normalize all these changes in transgenic animals, resulting in a state similar to wild-type mice. Our results show that G72 transcripts induce robust alterations in the glutamatergic system at the synaptic level that can be rescued with N-acetylcysteine treatment.
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48
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Rong R, Yang H, Rong L, Wei X, Li Q, Liu X, Gao H, Xu Y, Zhang Q. Proteomic analysis of PSD-93 knockout mice following the induction of ischemic cerebral injury. Neurotoxicology 2016; 53:1-11. [DOI: 10.1016/j.neuro.2015.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Revised: 12/04/2015] [Accepted: 12/05/2015] [Indexed: 01/09/2023]
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Hardingham GE, Do KQ. Linking early-life NMDAR hypofunction and oxidative stress in schizophrenia pathogenesis. Nat Rev Neurosci 2016; 17:125-34. [PMID: 26763624 DOI: 10.1038/nrn.2015.19] [Citation(s) in RCA: 231] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Molecular, genetic and pathological evidence suggests that deficits in GABAergic parvalbumin-positive interneurons contribute to schizophrenia pathophysiology through alterations in the brain's excitation-inhibition balance that result in impaired behaviour and cognition. Although the factors that trigger these deficits are diverse, there is increasing evidence that they converge on a common pathological hub that involves NMDA receptor hypofunction and oxidative stress. These factors have been separately linked to schizophrenia pathogenesis, but evidence now suggests that they are mechanistically interdependent and contribute to a common schizophrenia-associated pathology.
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Affiliation(s)
- Giles E Hardingham
- School of Biomedical Sciences, University of Edinburgh, George Square, Edinburgh EH8 9XD, UK
| | - Kim Q Do
- Department of Psychiatry, Center of Psychiatric Neuroscience, Centre Hospitalier Universitaire Vaudois and University of Lausanne, CH-1008, Prilly-Lausanne, Switzerland
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50
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Hara J, Shankle WR, Barrentine LW, Curole MV. Novel Therapy of Hyperhomocysteinemia in Mild Cognitive Impairment, Alzheimer's Disease, and Other Dementing Disorders. J Nutr Health Aging 2016; 20:825-834. [PMID: 27709231 DOI: 10.1007/s12603-016-0688-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVES Studies have produced conflicting results assessing hyperhomocysteinemia (HYH) treatment with B vitamins in patients with normal cognition, Alzheimer's disease and related disorders (ADRD). This study examined the effect of HYH management with L-methylfolate (LMF), methylcobalamin (MeCbl; B12), and N-acetyl-cysteine (CFLN: Cerefolin®/Cerefolin-NAC®) on cognitive decline. DESIGN Prospective, case-control study of subjects followed longitudinally. SETTING Outpatient clinic for cognitive disorders. PARTICIPANTS 116 ADRD patients (34 with HYH, 82 with No-HYH) met inclusion and exclusion criteria to participate. No study participant took B vitamins. INTERVENTION HYH patients received CFLN, and No-HYH patients did not. MEASUREMENTS Cognitive outcome measures included MCI Screen (memory), CERAD Drawings (constructional praxis), Ishihara Number Naming (object recognition), Trails A and B (executive function), and F-A-S test (verbal fluency). Dependent or predictor measures included demographics, functional severity, CFLN and no CFLN treatment duration, ADRD diagnosis, memantine and cholinesterase inhibitor treatment. Linear mixed effects models with covariate adjustment were used to evaluate rate of change on cognitive outcomes. RESULTS The duration of CFLN treatment, compared to an equivalent duration without CFLN treatment, significantly slowed decline in learning and memory, constructional praxis, and visual-spatial executive function (Trails B). CFLN treatment slowed cognitive decline significantly more for patients with milder baseline severity. CFLN treatment effect increased as baseline functional severity decreased. The analytical model showed that treatment duration must exceed some minimum period of at least one year to slow the rate of cognitive decline. CONCLUSION After covariate adjustment, HYH+CFLN significantly slowed cognitive decline compared to No-HYH+No-CFLN. Longer CFLN treatment duration, milder baseline severity, and magnitude of homocysteine reduction from baseline were all significant predictors. There are a number of factors that could account for disagreement with other clinical trials of B vitamin treatment of HYH. Moreover, CFLN is chemically distinct from commonly used B vitamins as both LMF and MeCbl are the fully reduced and bioactive functional forms; CLFN also contains the glutathione precursor, N-acetyl-cysteine. The findings of other B vitamin trials of HYH can, therefore, only partly account for treatment effects of CFLN. These findings warrant further evaluation with a randomized, placebo-controlled trial.
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Affiliation(s)
- J Hara
- Junko Hara, Ph.D. Shankle Clinic, 3900 W Coast Hwy, Ste 310, Newport Beach, CA 92663, Phone: +1-949-478-8858 ex222, Fax: +1-949-242-2465,
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