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Lauritano A, Cipollone I, Verde R, Kalkan H, Moriello C, Iannotti FA, Di Marzo V, Piscitelli F. The endocannabinoidome mediator N-oleoylglycine is a novel protective agent against 1-methyl-4-phenyl-pyridinium-induced neurotoxicity. Front Aging Neurosci 2022; 14:926634. [PMID: 36313013 PMCID: PMC9614236 DOI: 10.3389/fnagi.2022.926634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 09/07/2022] [Indexed: 11/19/2022] Open
Abstract
N-oleoylglycine (OlGly) is a lipid mediator that belongs to the expanded version of the endocannabinoid (eCB) system, the endocannabinoidome (eCBome), which has recently gained increasing attention from the scientific community for its protective effects in a mouse model of mild traumatic brain injury. However, the effects of OlGly on cellular models of Parkinson’s disease (PD) have not yet been investigated, whilst other lipoaminoacids have been reported to have beneficial effects. Moreover, the protective effects of OlGly seem to be mediated by direct activation of proliferator-activated receptor alpha (PPARα), which has already been investigated as a therapeutic target for PD. Therefore, this study aims to investigate the possible protective effects of OlGly in an in vitro model obtained by treating the neuroblastoma cell line, SH-SY5Y (both differentiated and not) with 1-methyl-4-phenyl-pyridinium (MPP+), which mimics some cellular aspects of a PD-like phenotype, in the presence or absence of the PPARα antagonist, GW6471. Our data show that MPP+ increases mRNA levels of PPARα in both non differentiated and differentiated cells. Using assays to assess cell metabolic activity, cell proliferation, and pro-inflammatory markers, we observed that OlGly (1 nM), both as treatment (1 h) and pre-treatment (4 h), is able to protect against neuronal damage induced by 24 h MPP+ exposure through PPARα. Moreover, using a targeted lipidomics approach, we demonstrate that OlGly exerts its effects also through the modulation of the eCBome. Finally, treatment with OlGly was able also to reduce increased IL-1β induced by MPP+ in differentiated cells. In conclusion, our results suggest that OlGly could be a promising therapeutic agent for the treatment of MPP+-induced neurotoxicity.
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Affiliation(s)
- Anna Lauritano
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
| | - Irene Cipollone
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
| | - Roberta Verde
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
| | - Hilal Kalkan
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
| | - Claudia Moriello
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
| | - Fabio Arturo Iannotti
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
| | - Vincenzo Di Marzo
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec City, QC, Canada
- Institut sur la Nutrition et les Aliments Fonctionnels, Centre NUTRISS, Université Laval, Québec City, QC, Canada
- *Correspondence: Vincenzo Di Marzo,
| | - Fabiana Piscitelli
- Endocannabinoid Research Group, Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, NA, Italy
- Fabiana Piscitelli,
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Protective Effects of a synthetic glycosaminoglycan mimetic (OTR4132) in a rat immunotoxic lesion model of septohippocampal cholinergic degeneration. Glycoconj J 2022; 39:107-130. [PMID: 35254602 PMCID: PMC8979900 DOI: 10.1007/s10719-022-10047-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 12/20/2021] [Accepted: 01/28/2022] [Indexed: 11/06/2022]
Abstract
Using a partial hippocampal cholinergic denervation model, we assessed the effects of the RGTA® named OTR4132, a synthetic heparan-mimetic biopolymer with neuroprotective/neurotrophic properties. Long-Evans male rats were injected with the cholinergic immunotoxin 192 IgG-saporin into the medial septum/diagonal band of Broca (0.37 µg); vehicle injections served as controls. Immediately after surgery, OTR4132 was injected into the lateral ventricles (0.25 µg/5 µl/rat) or intramuscularly (1.5 mg/kg). To determine whether OTR4132 reached the lesion site, some rats received intracerebroventricular (ICV) or intramuscular (I.M.) injections of fluorescent OTR4132. Rats were sacrificed at 4, 10, 20, or 60 days post-lesion (DPL). Fluorescein-labeled OTR4132 injected ICV or I.M. was found in the lesion from 4 to 20 DPL. Rats with partial hippocampal cholinergic denervation showed decreases in hippocampal acetylcholinesterase reaction products and in choline acetyltransferase-positive neurons in the medial septum. These lesions were the largest at 10 DPL and then remained stable until 60 DPL. Both hippocampal acetylcholinesterase reaction products and choline acetyltransferase-positive neurons in the medial septum effects were significantly attenuated in OTR4132-treated rats. These effects were not related to competition between OTR4132 and 192 IgG-saporin for the neurotrophin receptor P75 (p75NTR), as OTR4132 treatment did not alter the internalization of Cy3-labelled 192 IgG. OTR4132 was more efficient at reducing the acetylcholinesterase reaction products and choline acetyltransferase-positive neurons than a comparable heparin dose used as a comparator. Using the slice superfusion technique, we found that the lesion-induced decrease in muscarinic autoreceptor sensitivity was abolished by intramuscular OTR4132. After partial cholinergic damage, OTR4132 was able to concentrate at the brain lesion site possibly due to the disruption of the blood-brain barrier and to exert structural and functional effects that hold promises for neuroprotection/neurotrophism.
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Jeong JY, Kim M, Ji SY, Baek YC, Lee S, Oh YK, Reddy KE, Seo HW, Cho S, Lee HJ. Metabolomics Analysis of the Beef Samples with Different Meat Qualities and Tastes. Food Sci Anim Resour 2020; 40:924-937. [PMID: 33305277 PMCID: PMC7713764 DOI: 10.5851/kosfa.2020.e59] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 07/24/2020] [Accepted: 07/28/2020] [Indexed: 11/25/2022] Open
Abstract
The purpose of this study was to investigate the meat metabolite profiles related
to differences in beef quality attributes (i.e., high-marbled and low-marbled
groups) using nuclear magnetic resonance (NMR) spectroscopy. The beef of
different marbling scores showed significant differences in water content and
fat content. High-marbled meat had mainly higher taste compounds than
low-marbled meat. Metabolite analysis showed differences between two marbling
groups based on partial least square discriminant analysis (PLS-DA). Metabolites
identified by PLS-DA, such as N,N-dimethylglycine, creatine, lactate, carnosine,
carnitine, sn-glycero-3-phosphocholine, betaine, glycine, glucose, alanine,
tryptophan, methionine, taurine, tyrosine, could be directly linked to marbling
groups. Metabolites from variable importance in projection plots were identified
and estimated high sensitivity as candidate markers for beef quality attributes.
These potential markers were involved in beef taste-related pathways including
carbohydrate and amino acid metabolism. Among these metabolites, carnosine,
creatine, glucose, and lactate had significantly higher in high-marbled meat
compared to low-marbled meat (p<0.05). Therefore, these results will
provide an important understanding of the roles of taste-related metabolites in
beef quality attributes. Our findings suggest that metabolomics analysis of
taste compounds and meat quality may be a powerful method for the discovery of
novel biomarkers underlying the quality of beef products.
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Affiliation(s)
- Jin Young Jeong
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea
| | - Minseok Kim
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea.,Department of Animal Science, College of Agriculture and Life Sciences, Chonnam National University, Gwangju 61186, Korea
| | - Sang-Yun Ji
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea
| | - Youl-Chang Baek
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea
| | - Seul Lee
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea
| | - Young Kyun Oh
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea
| | - Kondreddy Eswar Reddy
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea
| | - Hyun-Woo Seo
- Animal Products Utilization Division, National Institute of Animal Science, Wanju 55365, Korea
| | - Soohyun Cho
- Animal Products Utilization Division, National Institute of Animal Science, Wanju 55365, Korea
| | - Hyun-Jeong Lee
- Animal Nutrition & Physiology Team, National Institute of Animal Science, Wanju 55365, Korea.,Dairy Science Division, National Institute of Animal Science, Cheonan 31000, Korea
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Neuronal death/apoptosis induced by intracellular zinc deficiency associated with changes in amino-acid neurotransmitters and glutamate receptor subtypes. J Inorg Biochem 2017; 179:54-59. [PMID: 29175628 DOI: 10.1016/j.jinorgbio.2017.11.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 11/07/2017] [Accepted: 11/17/2017] [Indexed: 12/13/2022]
Abstract
In the present study, a model of zinc deficiency was developed by exposing primary neurons to an N,N,N',N'-Tetrakis (2-pyridylmethyl) ethylenediamine (TPEN)-containing medium. The cell survival rate, apoptosis rate, intracellular and extracellular concentrations of 4 amino acids, and the expression of 2 glutamate receptor subtypes α-amino-3-hydroxy-5-methyl-4-isoxazolepropionate receptor (GluR2)and N-methyl-d-aspartate receptor subtype 2B (NR2B) were evaluated in zinc-deficient cells. The results revealed that zinc deficiency led to a decrease in cell viability and an increase in the apoptosis rate. Additionally, in cultured neurons, zinc deficiency led to an increase in the concentration of aspartic acid (Asp) and a decrease in the concentrations of glutamate (Glu), glycine (Gly), and gamma-aminobutyric acid (GABA). These changes were reversed by concurrent zinc supplementation. Furthermore, zinc deficiency led to an increase in the secreted amounts of Glu, Gly, and Asp but a decrease in secreted amounts of GABA, as measured using the concentrations of these amino acids in the cell-culture medium. These changes were partially reversed by zinc supplementation. Finally, zinc deficiency led to a significant decrease in GluR2 expression and an increase in NR2B expression in cultured neurons, whereas simultaneous treatment with zinc sulfate (ZnSO4) prevented these changes. These results suggest that zinc deficiency-induced neuronal death/apoptosis involves changes in the concentrations of 4 amino acid neurotransmitters and the expression of 2 glutamate receptor subtypes.
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Luan H, Liu LF, Tang Z, Zhang M, Chua KK, Song JX, Mok VCT, Li M, Cai Z. Comprehensive urinary metabolomic profiling and identification of potential noninvasive marker for idiopathic Parkinson's disease. Sci Rep 2015; 5:13888. [PMID: 26365159 PMCID: PMC4568456 DOI: 10.1038/srep13888] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 08/13/2015] [Indexed: 11/25/2022] Open
Abstract
Urine metabolic phenotyping has been associated with the development of Parkinson’s disease (PD). However, few studies using a comprehensive metabolomics approach have investigated the correlation between changes in the urinary markers and the progression of clinical symptoms in PD. A comprehensive metabolomic study with robust quality control procedures was performed using gas chromatography - mass spectrometry (GC - MS) and liquid chromatography - mass spectrometry (LC - MS) to characterize the urinary metabolic phenotypes of idiopathic PD patients at three stages (early, middle and advanced) and normal control subjects, with the aim of discovering potential urinary metabolite markers for the diagnosis of idiopathic PD. Both GC-MS and LC-MS metabolic profiles of idiopathic PD patients differed significantly from those of normal control subjects. 18 differentially expressed metabolites were identified as constituting a unique metabolic marker associated with the progression of idiopathic PD. Related metabolic pathway variations were observed in branched chain amino acid metabolism, glycine derivation, steroid hormone biosynthesis, tryptophan metabolism, and phenylalanine metabolism. Comprehensive, successive metabolomic profiling revealed changes in the urinary markers associated with progression of idiopathic PD. This profiling relies on noninvasive sampling, and is complementary to existing clinical modalities.
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Affiliation(s)
- Hemi Luan
- Department of Chemistry, Hong Kong Baptist University, Hong Kong SAR, China
| | - Liang-Feng Liu
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China.,Mr. &Mrs. Ko Chi-Ming Centre for Parkinson's Disease Research, Hong Kong Baptist University, Hong Kong SAR, China
| | - Zhi Tang
- Department of Chemistry, Hong Kong Baptist University, Hong Kong SAR, China
| | - Manwen Zhang
- Department of Chemistry, Hong Kong Baptist University, Hong Kong SAR, China
| | - Ka-Kit Chua
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China.,Mr. &Mrs. Ko Chi-Ming Centre for Parkinson's Disease Research, Hong Kong Baptist University, Hong Kong SAR, China
| | - Ju-Xian Song
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China.,Mr. &Mrs. Ko Chi-Ming Centre for Parkinson's Disease Research, Hong Kong Baptist University, Hong Kong SAR, China
| | - Vincent C T Mok
- Department of Medicine and Therapeutics, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Min Li
- School of Chinese Medicine, Hong Kong Baptist University, Hong Kong SAR, China.,Mr. &Mrs. Ko Chi-Ming Centre for Parkinson's Disease Research, Hong Kong Baptist University, Hong Kong SAR, China
| | - Zongwei Cai
- Department of Chemistry, Hong Kong Baptist University, Hong Kong SAR, China
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Maguire EP, Mitchell EA, Greig SJ, Corteen N, Balfour DJK, Swinny JD, Lambert JJ, Belelli D. Extrasynaptic glycine receptors of rodent dorsal raphe serotonergic neurons: a sensitive target for ethanol. Neuropsychopharmacology 2014; 39:1232-44. [PMID: 24264816 PMCID: PMC3957119 DOI: 10.1038/npp.2013.326] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 10/17/2013] [Accepted: 11/12/2013] [Indexed: 11/08/2022]
Abstract
Alcohol abuse is a significant medical and social problem. Several neurotransmitter systems are implicated in ethanol's actions, with certain receptors and ion channels emerging as putative targets. The dorsal raphe (DR) nucleus is associated with the behavioral actions of alcohol, but ethanol actions on these neurons are not well understood. Here, using immunohistochemistry and electrophysiology we characterize DR inhibitory transmission and its sensitivity to ethanol. DR neurons exhibit inhibitory 'phasic' post-synaptic currents mediated primarily by synaptic GABAA receptors (GABAAR) and, to a lesser extent, by synaptic glycine receptors (GlyR). In addition to such phasic transmission mediated by the vesicular release of neurotransmitter, the activity of certain neurons may be governed by a 'tonic' conductance resulting from ambient GABA activating extrasynaptic GABAARs. However, for DR neurons extrasynaptic GABAARs exert only a limited influence. By contrast, we report that unusually the GlyR antagonist strychnine reveals a large tonic conductance mediated by extrasynaptic GlyRs, which dominates DR inhibition. In agreement, for DR neurons strychnine increases their input resistance, induces membrane depolarization, and consequently augments their excitability. Importantly, this glycinergic conductance is greatly enhanced in a strychnine-sensitive fashion, by behaviorally relevant ethanol concentrations, by drugs used for the treatment of alcohol withdrawal, and by taurine, an ingredient of certain 'energy drinks' often imbibed with ethanol. These findings identify extrasynaptic GlyRs as critical regulators of DR excitability and a novel molecular target for ethanol.
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Affiliation(s)
- Edward P Maguire
- Division of Neuroscience, Medical Research Institute, Ninewells Hospital and Medical School, Dundee University, Dundee, UK
| | - Elizabeth A Mitchell
- Division of Neuroscience, Medical Research Institute, Ninewells Hospital and Medical School, Dundee University, Dundee, UK
| | - Scott J Greig
- Division of Neuroscience, Medical Research Institute, Ninewells Hospital and Medical School, Dundee University, Dundee, UK
| | - Nicole Corteen
- Institute for Biomedical and Biomolecular Sciences, School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, UK
| | - David J K Balfour
- Division of Neuroscience, Medical Research Institute, Ninewells Hospital and Medical School, Dundee University, Dundee, UK
| | - Jerome D Swinny
- Institute for Biomedical and Biomolecular Sciences, School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth, UK
| | - Jeremy J Lambert
- Division of Neuroscience, Medical Research Institute, Ninewells Hospital and Medical School, Dundee University, Dundee, UK
| | - Delia Belelli
- Division of Neuroscience, Medical Research Institute, Ninewells Hospital and Medical School, Dundee University, Dundee, UK
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Milanese M, Romei C, Usai C, Oliveri M, Raiteri L. A new function for glycine GlyT2 transporters: Stimulation of γ-aminobutyric acid release from cerebellar nerve terminals through GAT1 transporter reversal and Ca2+-dependent anion channels. J Neurosci Res 2013; 92:398-408. [DOI: 10.1002/jnr.23321] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Accepted: 10/08/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Marco Milanese
- Department of Pharmacy; Pharmacology and Toxicology Section, University of Genoa; Genoa Italy
- Center of Excellence for Biomedical Research; University of Genoa; Genoa Italy
| | - Cristina Romei
- Department of Pharmacy; Pharmacology and Toxicology Section, University of Genoa; Genoa Italy
| | - Cesare Usai
- Institute of Biophysics; National Research Council; Genoa Italy
| | - Martina Oliveri
- Department of Pharmacy; Pharmacology and Toxicology Section, University of Genoa; Genoa Italy
| | - Luca Raiteri
- Department of Pharmacy; Pharmacology and Toxicology Section, University of Genoa; Genoa Italy
- Center of Excellence for Biomedical Research; University of Genoa; Genoa Italy
- National Institute of Neuroscience; Genoa Italy
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Adermark L, Clarke RBC, Ericson M, Söderpalm B. Subregion-Specific Modulation of Excitatory Input and Dopaminergic Output in the Striatum by Tonically Activated Glycine and GABA(A) Receptors. Front Syst Neurosci 2011; 5:85. [PMID: 22028683 PMCID: PMC3199543 DOI: 10.3389/fnsys.2011.00085] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Accepted: 09/28/2011] [Indexed: 12/29/2022] Open
Abstract
The flow of cortical information through the basal ganglia is a complex spatiotemporal pattern of increased and decreased firing. The striatum is the biggest input nucleus to the basal ganglia and the aim of this study was to assess the role of inhibitory GABAA and glycine receptors in regulating synaptic activity in the dorsolateral striatum (DLS) and ventral striatum (nucleus accumbens, nAc). Local field potential recordings from coronal brain slices of juvenile and adult Wistar rats showed that GABAA receptors and strychnine-sensitive glycine receptors are tonically activated and inhibit excitatory input to the DLS and to the nAc. Strychnine-induced disinhibition of glutamatergic transmission was insensitive to the muscarinic receptor inhibitor scopolamine (10 μM), inhibited by the nicotinic acetylcholine receptor antagonist mecamylamine (10 μM) and blocked by GABAA receptor inhibitors, suggesting that tonically activated glycine receptors depress excitatory input to the striatum through modulation of cholinergic and GABAergic neurotransmission. As an end-product example of striatal GABAergic output in vivo we measured dopamine release in the DLS and nAc by microdialysis in the awake and freely moving rat. Reversed dialysis of bicuculline (50 μM in perfusate) only increased extrasynaptic dopamine levels in the nAc, while strychnine administered locally (200 μM in perfusate) decreased dopamine output by 60% in both the DLS and nAc. Our data suggest that GABAA and glycine receptors are tonically activated and modulate striatal transmission in a partially subregion-specific manner.
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Affiliation(s)
- Louise Adermark
- Addiction Biology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, University of Gothenburg Gothenburg, Sweden
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Bannai M, Kawai N, Nagao K, Nakano S, Matsuzawa D, Shimizu E. Oral administration of glycine increases extracellular serotonin but not dopamine in the prefrontal cortex of rats. Psychiatry Clin Neurosci 2011; 65:142-9. [PMID: 21414089 DOI: 10.1111/j.1440-1819.2010.02181.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM Glycine, one of the non-essential amino acids, has been reported to be effective in reducing negative symptoms of schizophrenia. Recently, we found that glycine improves subjective sleep quality in humans. The aim of this study was to investigate the effects of oral glycine administration on endogenous 5-hydroxytryptamine (5-HT) and dopamine in the prefrontal cortex (PFC) of living rats. METHODS Microdialysis probes were inserted stereotaxically into the rat prefrontal cortex. Cortical levels of 5-HT and dopamine were measured following oral administration of 1 or 2 g/kg glycine, 2 g/kg d-serine, or 2 g/kg L-serine. RESULTS Both glycine and d-serine significantly increased extracellular 5-HT levels for 10 min, whereas dopamine levels remained unchanged. L-serine, in contrast, had no significant effects on 5-HT levels. CONCLUSIONS It is possible that the increase in 5-HT in response to glycine and d-serine was mediated by N-methyl-D-aspartate receptors. The transient increase in 5-HT in the PFC might be associated with the alleviation of negative symptoms in patients with schizophrenia and the amelioration of sleep quality in patients with insomnia.
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Affiliation(s)
- Makoto Bannai
- Research Institute for Health Fundamentals, Ajinomoto Co., Inc., Kanagawa, Japan.
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Dissociating scopolamine-induced disrupted and persistent latent inhibition: stage-dependent effects of glycine and physostigmine. Psychopharmacology (Berl) 2010; 209:175-84. [PMID: 20179909 DOI: 10.1007/s00213-010-1785-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2009] [Accepted: 01/21/2010] [Indexed: 10/19/2022]
Abstract
RATIONALE Latent inhibition (LI) is the poorer conditioning to a stimulus seen when conditioning is preceded by repeated non-reinforced pre-exposure to the stimulus. LI indexes the ability to ignore irrelevant stimuli and is used extensively to model attentional impairments in schizophrenia. We showed that the pro-psychotic muscarinic antagonist scopolamine can produce LI disruption or LI persistence depending on dose and stage of administration: low doses disrupt LI acting in the pre-exposure stage of the LI procedure, whereas higher dose produces abnormally persistent LI via action in the conditioning stage. The two LI abnormalities show distinct response to antipsychotic drugs (APDs), with LI disruption, but not LI persistence, reversed by APDs. OBJECTIVES The objective of this study is to show that both LI abnormalities will be reversed by the cognitive enhancers, glycine and physostigmine, in a stage-specific manner, reversing each abnormality via the stage at which it is induced by scopolamine. METHODS LI was measured in a conditioned emotional response procedure. Scopolamine, physostigmine, and glycine were administered in pre-exposure and/or in conditioning. RESULTS Scopolamine (0.15 mg/kg)-induced disrupted LI was reversed by glycine (800 mg/kg) and physostigmine (0.15 mg/kg) via action in pre-exposure, whereas scopolamine (1.5 mg/kg)-induced persistent LI was reversed by these compounds via action in conditioning. In addition, glycine reversed scopolamine-induced disrupted LI via action in conditioning. Finally, glycine failed to reverse amphetamine-induced disrupted LI. CONCLUSIONS These results extend the pharmacological differentiation between scopolamine-induced disrupted and persistent LI and indicate that the scopolamine LI model may have a unique capacity to discriminate between typical APDs, atypical APDs, and cognitive enhancers.
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Hernandes MS, Troncone LRP. Glycine as a neurotransmitter in the forebrain: a short review. J Neural Transm (Vienna) 2009; 116:1551-60. [DOI: 10.1007/s00702-009-0326-6] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2009] [Accepted: 09/20/2009] [Indexed: 11/30/2022]
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