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Zhang Y, Wang H, Liu L, Mo X, He D, Chen X, Xiao R, Cheng Q, Fatima M, Du Y, Xie P. Maternal separation regulates sensitivity of stress-induced depression in mice by affecting hippocampal metabolism. Physiol Behav 2024; 279:114530. [PMID: 38552706 DOI: 10.1016/j.physbeh.2024.114530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/11/2024] [Accepted: 03/26/2024] [Indexed: 04/08/2024]
Abstract
Depression is a serious mental illness. Previous studies found that early life stress (ELS) plays a vital role in the onset and progression of depression. However, relevant studies have not yet been able to explain the specific effects of early stress on stress-induced depression sensitivity and individual behavior during growth. Therefore, we constructed a maternal separation (MS) model and administered chronic social frustration stress at different stages of their growth while conducting metabolomics analysis on the hippocampus of mice. Our results showed that the immobility time of mice in the forced swimming test was significantly reduced at the end of MS. Meanwhile, mice with MS experience significantly decreased total movement distance in the open field test and sucrose preference ratio in the sucrose preference test when subjected to chronic social defeat stress (CSDS) during adolescence. In adulthood, the results were the opposite. In addition, we found that level changes in metabolites such as Beta-alanine, l-aspartic acid, 2-aminoadipic acid, and Glycine are closely related to behavioral changes. These metabolites are mainly enriched in Pantothenate, CoA biosynthesis, and Beta Alanine metabolism pathways. Our experiment revealed that the effects of ELS vary across different age groups. It will increase an individual's sensitivity to depression when facing CSDS in adolescence, but it will reduce their sensitivity to depression when facing CSDS in adulthood. This may be achieved by regulating the hippocampus's Pantothenate and CoA biosynthesis and Beta Alanine metabolism pathways represented by Beta-alanine, l-Aspartic acid, 2-aminoadipic acid, and Glycine metabolites.
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Affiliation(s)
- Yangdong Zhang
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Haiyang Wang
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Lanxiang Liu
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, Yongchuan Hospital of Chongqing Medical University, Chongqing, 402160, China
| | - Xiaolong Mo
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Dian He
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Xueyi Chen
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Faculty of Basic Medicine, Department of Pathology, Chongqing Medical University, Chongqing, 400016, China
| | - Rui Xiao
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Faculty of Basic Medicine, Department of Pathology, Chongqing Medical University, Chongqing, 400016, China
| | - Qisheng Cheng
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Madiha Fatima
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Yamei Du
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China
| | - Peng Xie
- NHC Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, 400016, China; Department of Neurology, Yongchuan Hospital of Chongqing Medical University, Chongqing, 402160, China.
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Alanazi IM, Alzahrani AR, Alsaad MA, Moqeem AL, Hamdi AM, Taher MM, Watson DG, Helen Grant M. The effect of mephedrone on human neuroblastoma and astrocytoma cells. Saudi Pharm J 2024; 32:102011. [PMID: 38454918 PMCID: PMC10918268 DOI: 10.1016/j.jsps.2024.102011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024] Open
Abstract
Mephedrone is an illegal drug that is used recreationally. Few studies have been conducted to investigate the mechanisms by which mephedrone is harming cells. In this research, we investigated the effect of mephedrone using toxicology coupled with LC-MS/MS based metabolomics in the two CNS derived cell lines. Methods of assessment such as neutral red (NR) assay, dimethylthiazolyl diphenyltetrazolium bromide (MTT), lactose dehydrogenase (LDH) measurement, and morphology were performed to identify the effect on cell viability and to identify the best concentration to be used in a metabolomics study. A concentration of 100 μM of mephedrone was used in the metabolomic experiment because at this concentration mephedrone had induced several intracellular changes. Although there no clear indicators of cellular damage caused by mephedrone. In astrocytes there was a clear indication that cell membrane function might be impaired by depletion of ether lipids.
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Affiliation(s)
- Ibrahim M. Alanazi
- Department of Pharmacology and Toxicology, College of Medicine, Umm Al-Qura University, Al-Abidiyah, P.O.Box 13578, Makkah 21955, Saudi Arabia
| | - Abdullah R. Alzahrani
- Department of Pharmacology and Toxicology, College of Medicine, Umm Al-Qura University, Al-Abidiyah, P.O.Box 13578, Makkah 21955, Saudi Arabia
| | - Mohammad A. Alsaad
- Department of Parasitology, College of Medicine, Umm AL Qura University, Al-Abidiyah, P.O.Box 13578, Makkah 21955, Saudi Arabia
| | - Abdulaziz L. Moqeem
- Home Health Care,Directorate of Health Affairs Jeddah, Ministry of Health, P.O.Box11176, Ryiadh, Saudi Arabia
| | - Abdulmohsen M. Hamdi
- Home Health Care,Directorate of Health Affairs Jeddah, Ministry of Health, P.O.Box11176, Ryiadh, Saudi Arabia
| | - Mohiuddin M. Taher
- Science and Technology Unit, Deanship of Scientific Research, and Department of Medical Genetics, College of Medicine, Umm-Al-Qura University, Makkah, Saudi Arabia
| | - David G. Watson
- Strathclyde Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK
| | - M. Helen Grant
- Department of Biomedical Engineering, University of Strathclyde, Glasgow G4 0NW, UK
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3
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Glutamine Synthetase Contributes to the Regulation of Growth, Conidiation, Sclerotia Development, and Resistance to Oxidative Stress in the Fungus Aspergillus flavus. Toxins (Basel) 2022; 14:toxins14120822. [PMID: 36548719 PMCID: PMC9785230 DOI: 10.3390/toxins14120822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/12/2022] [Accepted: 11/21/2022] [Indexed: 11/27/2022] Open
Abstract
The basic biological function of glutamine synthetase (Gs) is to catalyze the conversion of ammonium and glutamate to glutamine. This synthetase also performs other biological functions. However, the roles of Gs in fungi, especially in filamentous fungi, are not fully understood. Here, we found that conditional disruption of glutamine synthetase (AflGsA) gene expression in Aspergillus flavus by using a xylose promoter leads to a complete glutamine deficiency. Supplementation of glutamine could restore the nutritional deficiency caused by AflGsA expression deficiency. Additionally, by using the xylose promoter for the downregulation of AflgsA expression, we found that AflGsA regulates spore and sclerotic development by regulating the transcriptional levels of sporulation genes abaA and brlA and the sclerotic generation genes nsdC and nsdD, respectively. In addition, AflGsA was found to maintain the balance of reactive oxygen species (ROS) and to aid in resisting oxidative stress. AflGsA is also involved in the regulation of light signals through the production of glutamine. The results also showed that the recombinant AflGsA had glutamine synthetase activity in vitro and required the assistance of metal ions. The inhibitor molecule L-α-aminoadipic acid suppressed the activity of rAflGsA in vitro and disrupted the morphogenesis of spores, sclerotia, and colonies in A. flavus. These results provide a mechanistic link between nutrition metabolism and glutamine synthetase in A. flavus and suggest a strategy for the prevention of fungal infection.
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Piirsalu M, Taalberg E, Jayaram M, Lilleväli K, Zilmer M, Vasar E. Impact of a High-Fat Diet on the Metabolomics Profile of 129S6 and C57BL6 Mouse Strains. Int J Mol Sci 2022; 23:ijms231911682. [PMID: 36232982 PMCID: PMC9569783 DOI: 10.3390/ijms231911682] [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: 08/29/2022] [Revised: 09/24/2022] [Accepted: 09/29/2022] [Indexed: 11/29/2022] Open
Abstract
Different inbred mouse strains vary substantially in their behavior and metabolic phenotype under physiological and pathological conditions. The purpose of this study was to extend the knowledge of distinct coping strategies under challenging events in two differently adapting mouse strains: C57BL/6NTac (Bl6) and 129S6/SvEvTac (129Sv). Thus, we aimed to investigate possible similarities and differences in the body weight change, behavior, and several metabolic variables in Bl6 and 129Sv strains in response to high-fat diet (HFD) using the AbsoluteIDQ p180 kit. We found that 9 weeks of HFD induced a significant body weight gain in 129Sv, but not in Bl6 mice. Besides that, 129Sv mice displayed anxiety-like behavior in the open-field test. Metabolite profiling revealed that 129Sv mice had higher levels of circulating branched-chain amino acids, which were even more amplified by HFD. HFD also induced a decrease in glycine, spermidine, and t4-OH-proline levels in 129Sv mice. Although acylcarnitines (ACs) dominated in baseline conditions in 129Sv strain, this strain had a significantly stronger AC-reducing effect of HFD. Moreover, 129Sv mice had higher levels of lipids in baseline conditions, but HFD caused more pronounced alterations in lipid profile in Bl6 mice. Taken together, our results show that the Bl6 line is better adapted to abundant fat intake.
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Affiliation(s)
- Maria Piirsalu
- Institute of Biomedicine and Translational Medicine, Department of Physiology, University of Tartu, 19 Ravila Street, 50411 Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Egon Taalberg
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
- Institute of Biomedicine and Translational Medicine, Department of Biochemistry, University of Tartu, 19 Ravila Street, 50411 Tartu, Estonia
| | - Mohan Jayaram
- Institute of Biomedicine and Translational Medicine, Department of Physiology, University of Tartu, 19 Ravila Street, 50411 Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Kersti Lilleväli
- Institute of Biomedicine and Translational Medicine, Department of Physiology, University of Tartu, 19 Ravila Street, 50411 Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
| | - Mihkel Zilmer
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
- Institute of Biomedicine and Translational Medicine, Department of Biochemistry, University of Tartu, 19 Ravila Street, 50411 Tartu, Estonia
| | - Eero Vasar
- Institute of Biomedicine and Translational Medicine, Department of Physiology, University of Tartu, 19 Ravila Street, 50411 Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, 50411 Tartu, Estonia
- Correspondence:
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Sandri BJ, Kim J, Lubach GR, Lock EF, Guerrero C, Higgins L, Markowski TW, Kling PJ, Georgieff MK, Coe CL, Rao RB. Multiomic Profiling of Iron Deficient Infant Monkeys Reveals Alterations in Neurologically Important Biochemicals in Serum and CSF Prior to the Onset of Anemia. Am J Physiol Regul Integr Comp Physiol 2022; 322:R486-R500. [PMID: 35271351 DOI: 10.1152/ajpregu.00235.2021] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND The effects of iron deficiency (ID) during infancy extend beyond the hematologic compartment and include short- and long-term adverse effects on many tissues including the brain. However, sensitive biomarkers of iron-dependent brain health are lacking in humans. OBJECTIVE To determine whether serum and CSF biomarkers of ID-induced metabolic dysfunction are concordant in the pre/early anemic stage of ID prior to anemia in a nonhuman primate model of infantile IDA. METHODS Paired serum and CSF specimens were collected from iron-sufficient (IS; n = 12) and ID (n = 7) rhesus infants at 4-months (pre-anemic period) and 6-months of age (anemic). Hematological, metabolomic, and proteomic profiles were generated via HPLC/MS at both time points to discriminate serum bio markers of ID-induced brain metabolic dysfunction. RESULTS We identified 227 metabolites and 205 proteins in serum. Abnormalities indicating altered liver function, lipid dysregulation, and increased acute phase reactants were present in ID. In CSF, we measured 210 metabolites and 1,560 proteins with changes in ID infants indicative of metabolomic and proteomic differences indexing disrupted synaptogenesis. Systemic and CSF proteomic and metabolomic changes were present and concurrent in the pre-anemic and anemic periods. CONCLUSIONS Multiomic serum and CSF profiling uncovered pathways disrupted by ID in both the pre-anemic and anemic stages of infantile IDA, including evidence for hepatic dysfunction and activation of acute phase response. Parallel changes observed in serum and CSF potentially provide measurable serum biomarkers of ID that reflect at-risk brain processes prior to progression to clinical anemia.
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Affiliation(s)
- Brian J Sandri
- Division of Neonatology, Department of Pediatrics, University of Minnesota, Minneapolis, MN, United States.,Masonic Institute for the Developing Brain, University of Minnesota, Minneapolis, MN, United States
| | - Jonathan Kim
- Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN, United States
| | - Gabriele R Lubach
- Harlow Center for Biological Psychology, University of Wisconsin, Madison, WI, United States
| | - Eric F Lock
- Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, MN, United States
| | - Candace Guerrero
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - LeeAnn Higgins
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Todd W Markowski
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Pamela J Kling
- Division of Neonatology, Department of Pediatrics, University of Wisconsin, Madison, WI, United States
| | - Michael K Georgieff
- Division of Neonatology, Department of Pediatrics, University of Minnesota, Minneapolis, MN, United States.,Masonic Institute for the Developing Brain, University of Minnesota, Minneapolis, MN, United States
| | - Christopher L Coe
- Harlow Center for Biological Psychology, University of Wisconsin, Madison, WI, United States
| | - Raghavendra B Rao
- Division of Neonatology, Department of Pediatrics, University of Minnesota, Minneapolis, MN, United States.,Masonic Institute for the Developing Brain, University of Minnesota, Minneapolis, MN, United States
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Evaluation of Analytes Characterized with Potential Protective Action after Rat Exposure to Lead. Molecules 2021; 26:molecules26082163. [PMID: 33918725 PMCID: PMC8069014 DOI: 10.3390/molecules26082163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/07/2021] [Accepted: 04/08/2021] [Indexed: 11/17/2022] Open
Abstract
Lead (Pb) was revealed for its role as a neurodevelopmental toxin. The determination of neurotransmitters (NTs) in particular brain regions could ameliorate the precise description and optimization of therapeutic protocols able to restore the harmony of signaling pathways in nervous and immune systems. The determination of selected analytes from the group of NTs based on the liquid chromatography (LC)-based method was carried out to illustrate the changes of amino acid (AA) and biogenic amine (BA) profiles observed in chosen immune and nervous systems rat tissues after Pb intoxication. Also, a protective combination of AA was proposed to correct the changes caused by Pb intoxication. After the administration of Pb, changes were observed in all organs studied and were characterized by a fluctuation of NT concentrations in immune and nervous systems (hypothalamus samples). Using a protective mixture of bioactive compounds prevented numerous changes in the balance of NT. The combined analysis of the immune and nervous system while the normalizing effect of curative agents on the level of differentially secreted NTs and AA is studied could present a new approach to the harmonization of those two essential systems after Pb intoxication.
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Paley EL. Discovery of Gut Bacteria Specific to Alzheimer's Associated Diseases is a Clue to Understanding Disease Etiology: Meta-Analysis of Population-Based Data on Human Gut Metagenomics and Metabolomics. J Alzheimers Dis 2020; 72:319-355. [PMID: 31561379 DOI: 10.3233/jad-190873] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease (AD)-associated sequence (ADAS) of cultured fecal bacteria was discovered in human gut targeted screening. This study provides important information to expand our current understanding of the structure/activity relationship of ADAS and putative inhibitors/activators that are potentially involved in ADAS appearance/disappearance. The NCBI database analysis revealed that ADAS presents at a large proportion in American Indian Oklahoman (C&A) with a high prevalence of obesity/diabetes and in colorectal cancer (CRC) patients from the US and China. An Oklahoman non-native group (NNI) showed no ADAS. Comparison of two large US populations reveals that ADAS is more frequent in individuals aged ≥66 and in females. Prevalence and levels of fecal metabolites are altered in the C&A and CRC groups versus controls. Biogenic amines (histamine, tryptamine, tyramine, phenylethylamine, cadaverine, putrescine, agmatine, spermidine) that present in food and are produced by gut microbiota are significantly higher in C&A (e.g., histamine/histidine 95-fold) versus NNI (histamine/histidine 16-fold). The majority of these bio-amines are cytotoxic at concentrations found in food. Inositol phosphate signaling implicated in AD is altered in C&A and CRC. Tryptamine stimulated accumulation of inositol phosphate. The seizure-eliciting tryptamine induced cytoplasmic vacuolization and vesiculation with cell fragmentation. Present additions of ADAS-carriers at different ages including infants led to an ADAS-comprising human sample size of 2,830 from 27 studies from four continents (North America, Australia, Asia, Europe). Levels of food-derived monoamine oxidase inhibitors and anti-bacterial compounds, the potential modulators of ADAS-bacteria growth and biogenic amine production, were altered in C&A versus NNI. ADAS is attributable to potentially modifiable risk factors of AD associated diseases.
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Affiliation(s)
- Elena L Paley
- Expert Biomed, Inc., Miami, FL, USA.,Stop Alzheimers Corp, Miami, FL, USA
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Hergesheimer R, Lanznaster D, Bourgeais J, Hérault O, Vourc’h P, Andres CR, Corcia P, Blasco H. Conditioned Medium from Cells Overexpressing TDP-43 Alters the Metabolome of Recipient Cells. Cells 2020; 9:cells9102198. [PMID: 33003404 PMCID: PMC7601466 DOI: 10.3390/cells9102198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/25/2020] [Accepted: 09/25/2020] [Indexed: 12/14/2022] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease caused by the progressive death of both upper and lower motor neurons. The disease presents a poor prognosis, and patients usually die 2-5 years after the onset of symptoms. The hallmark of this disease is the presence of phosphorylated and ubiquitinated aggregates containing trans-active response DNA-binding protein-43 (TDP-43) in the cytoplasm of motor neurons. TDP-43 pathology has been associated with multiple pathways in ALS, such as metabolic dysfunction found in patients and in in vivo models. Recently, it has been described as a "prion-like" protein, as studies have shown its propagation in cell culture from ALS brain extract or overexpressed TDP-43 in co-culture and conditioned medium, resulting in cytotoxicity. However, the cellular alterations that are associated with this cytotoxicity require further investigation. Here, we investigated the effects of conditioned medium from HEK293T (Human Embryonic Kidney 293T) cells overexpressing TDP-43 on cellular morphology, proliferation, death, and metabolism. Although we did not find evidence of TDP-43 propagation, we observed a toxicity of TDP-43-conditioned medium and altered metabolism. These results, therefore, suggest (1) that cells overexpressing TDP-43 produce an extracellular environment that can perturb other cells and (2) that TDP-43 propagation alone may not be the only potentially cytotoxic cell-to-cell mechanism.
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Affiliation(s)
- Rudolf Hergesheimer
- INSERM, UMR 1253, iBrain, Université de Tours, 37000 Tours, France; (R.H.); (D.L.); (P.V.); (C.R.A.); (P.C.)
| | - Débora Lanznaster
- INSERM, UMR 1253, iBrain, Université de Tours, 37000 Tours, France; (R.H.); (D.L.); (P.V.); (C.R.A.); (P.C.)
| | - Jérôme Bourgeais
- CNRS ERL7001, EA 7501 GICC, Université de Tours, 37000 Tours, France; (J.B.); (O.H.)
| | - Olivier Hérault
- CNRS ERL7001, EA 7501 GICC, Université de Tours, 37000 Tours, France; (J.B.); (O.H.)
| | - Patrick Vourc’h
- INSERM, UMR 1253, iBrain, Université de Tours, 37000 Tours, France; (R.H.); (D.L.); (P.V.); (C.R.A.); (P.C.)
- CHU de Tours, Service de Biochimie et Biologie Moléculaire, 37000 Tours, France
| | - Christian R. Andres
- INSERM, UMR 1253, iBrain, Université de Tours, 37000 Tours, France; (R.H.); (D.L.); (P.V.); (C.R.A.); (P.C.)
- CHU de Tours, Service de Biochimie et Biologie Moléculaire, 37000 Tours, France
| | - Philippe Corcia
- INSERM, UMR 1253, iBrain, Université de Tours, 37000 Tours, France; (R.H.); (D.L.); (P.V.); (C.R.A.); (P.C.)
- CHU de Tours, Service de Neurologie, 37000 Tours, France
| | - Hélène Blasco
- INSERM, UMR 1253, iBrain, Université de Tours, 37000 Tours, France; (R.H.); (D.L.); (P.V.); (C.R.A.); (P.C.)
- CHU de Tours, Service de Biochimie et Biologie Moléculaire, 37000 Tours, France
- Correspondence:
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Metabolomics approach revealed robust changes in amino acid and biogenic amine signatures in patients with schizophrenia in the early course of the disease. Sci Rep 2020; 10:13983. [PMID: 32814830 PMCID: PMC7438522 DOI: 10.1038/s41598-020-71014-w] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Accepted: 08/04/2020] [Indexed: 02/06/2023] Open
Abstract
The primary objective of this study was to evaluate how schizophrenia (SCH) spectrum disorders and applied antipsychotic (AP) treatment affect serum level of amino acids (AAs) and biogenic amines (BAs) in the early course of the disorder. We measured 21 different AAs and 10 BAs in a sample of antipsychotic (AP)-naïve first-episode psychosis (FEP) patients (n = 52) at baseline, after 0.6-year as well as after 5.1-year treatment compared to control subjects (CSs, n = 37). Serum levels of metabolites were determined with AbsoluteIDQ p180 kit using flow injection analysis tandem mass spectrometry and liquid chromatography technique. Elevated level of taurine and reduced level of proline and alpha-aminoadipic acid (alpha-AAA) were established as metabolites with significant change in AP-naïve FEP patients compared to CSs. The following 0.6-year treatment restored these alterations. However, further continuous 5.1-year AP treatment changed the metabolic profile substantially. Significantly elevated levels of asparagine, glutamine, methionine, ornithine and taurine, alongside with decreased levels of aspartate, glutamate and alpha-AAA were observed in the patient group compared to CSs. These biomolecule profile alterations provide further insights into the pathophysiology of SCH spectrum disorders and broaden our understanding of the impact of AP treatment in the early stages of the disease.
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Piirsalu M, Taalberg E, Lilleväli K, Tian L, Zilmer M, Vasar E. Treatment With Lipopolysaccharide Induces Distinct Changes in Metabolite Profile and Body Weight in 129Sv and Bl6 Mouse Strains. Front Pharmacol 2020; 11:371. [PMID: 32292347 PMCID: PMC7118216 DOI: 10.3389/fphar.2020.00371] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 03/11/2020] [Indexed: 12/19/2022] Open
Abstract
Mouse strains differ significantly in their behaviors and responses to pathogenic and pharmacological agents. This study seeks to characterize behavioral and metabolomic profiles of two widely used mouse lines, 129S6/SvEvTac (129Sv) and C57BL/6NTac (Bl6), to acute administration of lipopolysaccharide (LPS). LPS caused a significant suppression of locomotor activity and a decline in body weight (BW) in both strains within 24 h. However, the BW loss was more pronounced in Bl6 than in 129Sv. Comparison of strains revealed clear differences between their metabolomic profiles. According to the general linear model analysis (GLM), the 1.5 h LPS challenge in Bl6 caused a decrease of propionylcarnitine (C3), glucogenic amino acids, and acetylornithine (Ac-Orn), whereas the response of 129Sv included decreased concentrations of short-chain acylcarnitines (SCACs), citrulline, and elevation of glycerophospholipid (PCaa C42:0) and sphingolipid [SM(OH)C16:1]. 24 h after LPS administration, robust alterations in lipid profile were observed in both strains. LPS treatment caused elevation of sphingolipids, phosphatidylcholine diacyls (PCaa) as well as a decrease in lysophosphatidylcholines (LysoPC). However, the number of elevated PCaa and sphingolipids was considerably higher in 129Sv. In addition to lipids, 24 h LPS challenge in Bl6 mice induced increased levels of kynurenine (KYN), putrescine and decreased levels of citrulline, hexoses, Ac-Orn, and PC acyl-alkyl (PCae 38:2) as well as severe BW loss. In contrast, the 24 h LPS challenge in 129Sv mice induced increased levels of KYN, long-chain acylcarnitines (LCACs) and decreased levels of citrulline as well as moderate BW loss. Altogether, our study revealed both similarities and differences in response to LPS in Bl6 and 129Sv strains. For major differences, Bl6 mice showed stronger reduction of BW 24 h after LPS treatment, accompanied by significantly reduced levels of hexoses, the ratio between LysoPC16:1/LysoPC16:0, and elevated levels of neuroprotective putrescine. In 129Sv mice, the BW loss was milder, accompanied by increased levels of hydroxylated LCACs, probably reflecting shifts in oxidative metabolism of fatty acids. One may suggest that LPS caused stronger hypometabolic state in the Bl6 mice than in the 129Sv strain. Altogether, this study confirms that Bl6 and 129Sv mice display vastly distinct adaptation capacities independent from the nature of stressful challenge.
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Affiliation(s)
- Maria Piirsalu
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia.,Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Egon Taalberg
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia.,Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Kersti Lilleväli
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia.,Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Li Tian
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia.,Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Mihkel Zilmer
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia.,Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Eero Vasar
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia.,Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
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11
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PouralijanAmiri M, Khoshkam M, Madadi R, Kamali K, Faghanzadeh Ganji G, Salek R, Ramazani A. NMR-based plasma metabolic profiling in patients with unstable angina. IRANIAN JOURNAL OF BASIC MEDICAL SCIENCES 2020; 23:311-320. [PMID: 32440317 PMCID: PMC7229510 DOI: 10.22038/ijbms.2020.39979.9475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 09/23/2019] [Indexed: 01/29/2023]
Abstract
OBJECTIVES Unstable angina (UA) is a form of the acute coronary syndrome (ACS) that affects more than a third of the population before age 70. Due to the limitations of diagnostic tests, appropriate identification of UA is difficult. In this study, we proceeded to investigate metabolite profiling in UA patients compared with controls to determine potential candidate biomarkers. MATERIALS AND METHODS Ninety-four plasma samples from UA and 32 samples from controls were analyzed based on 1H NMR spectroscopy. The raw data were processed, analyzed, and subjected to partial least squares-discrimination analysis (PLS-DA), a supervised classification method with a good separation of control and UA patients was observed. The most important variables (VIP) ≥1 were selected and submitted to MetaboAnalyst pathway enrichment to identify the most important ones. RESULTS We identified 17 disturbed metabolites in UA patients in comparison with the controls. These metabolites are involved in various biochemical pathways such as steroid hormone biosynthesis, aminoacyl-tRNA biosynthesis, and lysine degradation. Some of the metabolites were deoxycorticosterone, 17-hydroxyprogesterone, androstenedione, androstanedione, etiocholanolone, estradiol, 2-hydroxyestradiol, 2-hydroxyestrone, 2-methoxyestradiol, and 2-methoxyestrone. In order to determine test applicability in diagnosing UA, a diagnostic model was further created using the receiver operator characteristic (ROC) curve. The areas under the curve (AUC), sensitivity, specificity, and precision were 0.87, 90%, 65%, and 91%, respectively, for diagnosing of UA. CONCLUSION These metabolites could not only be useful for the diagnosis of UA patients but also provide more information for further deciphering of the biological processes of UA.
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Affiliation(s)
- Mohammad PouralijanAmiri
- Department of Genetics & Molecular Medicine, Faculty of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Maryam Khoshkam
- Chemistry Group, Faculty of Basic Sciences, University of Mohaghegh Ardabili, Ardabil, Iran
| | - Reza Madadi
- Department of Cardiology, Mousavi Hospital, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Koorosh Kamali
- Zanjan Metabolic Diseases Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
| | | | - Reza Salek
- International Agency for Research on Cancer, 150cours Albert Thomas, 69372 Lyon CEDEX 08, Lyon, France
| | - Ali Ramazani
- Zanjan Metabolic Diseases Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
- Cancer Gene Therapy Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
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12
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Neul JL, Skinner SA, Annese F, Lane J, Heydemann P, Jones M, Kaufmann WE, Glaze DG, Percy AK. Metabolic Signatures Differentiate Rett Syndrome From Unaffected Siblings. Front Integr Neurosci 2020; 14:7. [PMID: 32161522 PMCID: PMC7052375 DOI: 10.3389/fnint.2020.00007] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 01/30/2020] [Indexed: 01/07/2023] Open
Abstract
Rett syndrome (RTT, OMIM 312750), a severe neurodevelopmental disorder characterized by regression with loss of spoken language and hand skills, development of characteristic hand stereotypies, and gait dysfunction, is primarily caused by de novo mutations in the X-linked gene Methyl-CpG-binding protein 2 (MECP2). Currently, treatment options are limited to symptomatic management, however, reversal of disease phenotype is possible in mouse models by restoration of normal MECP2 gene expression. A significant challenge is the lack of biomarkers of disease state, disease severity, or treatment response. Using a non-targeted metabolomic approach we evaluated metabolite profiles in plasma from thirty-four people with RTT compared to thirty-seven unaffected age- and gender-matched siblings. We identified sixty-six significantly altered metabolites that cluster broadly into amino acid, nitrogen handling, and exogenous substance pathways. RTT disease metabolite and metabolic pathways abnormalities point to evidence of oxidative stress, mitochondrial dysfunction, and alterations in gut microflora. These observed changes provide insight into underlying pathological mechanisms and the foundation for biomarker discovery of disease severity biomarkers.
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Affiliation(s)
- Jeffrey L Neul
- Vanderbilt University Medical Center, Nashville, TN, United States.,Department of Neurosciences, University of California, San Diego, San Diego, CA, United States.,Baylor College of Medicine, Houston, TX, United States
| | | | - Fran Annese
- Greenwood Genetic Center, Greenwood, SC, United States
| | - Jane Lane
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, United States
| | | | - Mary Jones
- Benioff Children's Hospital Oakland, University of California, San Francisco, San Francisco, CA, United States
| | | | | | - Alan K Percy
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL, United States
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13
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Simultaneous quantification of dopamine, serotonin, their metabolites and amino acids by LC-MS/MS in mouse brain following repetitive transcranial magnetic stimulation. Neurochem Int 2019; 131:104546. [DOI: 10.1016/j.neuint.2019.104546] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 09/07/2019] [Accepted: 09/08/2019] [Indexed: 12/12/2022]
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14
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Yamamoto T, Hatabayashi K, Arita M, Yajima N, Takenaka C, Suzuki T, Takahashi M, Oshima Y, Hara K, Kagawa K, Kawamata S. Kynurenine signaling through the aryl hydrocarbon receptor maintains the undifferentiated state of human embryonic stem cells. Sci Signal 2019; 12:12/587/eaaw3306. [PMID: 31239324 DOI: 10.1126/scisignal.aaw3306] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Kynurenine, which is generated from tryptophan by indoleamine 2,3-dioxygenase 1 (IDO1), binds to the aryl hydrocarbon receptor (AhR). Here, we report that kynurenine was produced by undifferentiated human embryonic stem cells (hESCs) and by induced pluripotent stem cells (iPSCs). In undifferentiated hESCs, kynurenine stimulated the AhR to promote the expression of self-renewal genes. The kynurenine-AhR complex also stimulated the expression of IDO1 and AHR, activating a positive feedback loop. Inhibition of IDO1 activity reduced the proliferation of undifferentiated ESCs but did not stimulate their differentiation. Substantial amounts of free kynurenine were present in the culture medium, providing a paracrine signal for maintenance of the undifferentiated state. Kynurenine was not present in the medium of differentiated ESCs or iPSCs. When ESCs were induced to undergo ectodermal differentiation, the abundance of kynurenine in the medium was reduced through activation of the main kynurenine catabolic pathway mediated by kynurenine aminotransferase 2 (KAT2, also known as AADAT), resulting in the secretion of 2-aminoadipic acid (2-AAA) into the culture medium. Inhibition of KAT2 activity blocked ectodermal differentiation. Thus, kynurenine metabolism plays an important role in the maintenance of the undifferentiated state and in ectodermal differentiation. Furthermore, kynurenine in the culture medium is a biomarker for the undifferentiated state, whereas the presence of 2-AAA in the culture medium is a biomarker of ESCs and iPSCs that have committed to differentiate along the ectoderm lineage.
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Affiliation(s)
- Takako Yamamoto
- Research & Development Center for Cell Therapy, Foundation for Biomedical Research and Innovation, 2-2 Minatojima Minami-machi, Chuo-ku, Kobe 650-0047, Japan
| | - Kunitada Hatabayashi
- Innovative Technology Planning Department, Tokyo Electron Limited, Akasaka Biz Tower, 5-3-1 Akasaka, Minato-Ku, Tokyo 107-6325, Japan
| | - Mao Arita
- Research & Development Center for Cell Therapy, Foundation for Biomedical Research and Innovation, 2-2 Minatojima Minami-machi, Chuo-ku, Kobe 650-0047, Japan
| | - Nobuyuki Yajima
- Research & Development Center for Cell Therapy, Foundation for Biomedical Research and Innovation, 2-2 Minatojima Minami-machi, Chuo-ku, Kobe 650-0047, Japan
| | - Chiemi Takenaka
- Research & Development Center for Cell Therapy, Foundation for Biomedical Research and Innovation, 2-2 Minatojima Minami-machi, Chuo-ku, Kobe 650-0047, Japan
| | - Takashi Suzuki
- Analytical and Measuring Instruments Division, Shimadzu Corporation, 1 Nishinokyo, Kuwahara-cho, Nagagyo-ku, Kyoto 604-8511, Japan
| | - Masatoshi Takahashi
- Analytical and Measuring Instruments Division, Shimadzu Corporation, 1 Nishinokyo, Kuwahara-cho, Nagagyo-ku, Kyoto 604-8511, Japan
| | - Yasuhiro Oshima
- Innovative Technology Planning Department, Tokyo Electron Limited, Akasaka Biz Tower, 5-3-1 Akasaka, Minato-Ku, Tokyo 107-6325, Japan
| | - Keisuke Hara
- Innovative Technology Planning Department, Tokyo Electron Limited, Akasaka Biz Tower, 5-3-1 Akasaka, Minato-Ku, Tokyo 107-6325, Japan
| | - Kenichi Kagawa
- Innovative Technology Planning Department, Tokyo Electron Limited, Akasaka Biz Tower, 5-3-1 Akasaka, Minato-Ku, Tokyo 107-6325, Japan
| | - Shin Kawamata
- Research & Development Center for Cell Therapy, Foundation for Biomedical Research and Innovation, 2-2 Minatojima Minami-machi, Chuo-ku, Kobe 650-0047, Japan. .,Riken Center for Developmental Biology, 2-1 Minatojima Minami-machi, Chuo-ku, Kobe 650-0047, Japan
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15
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Hassel B, Rogne AG, Hope S. Intellectual Disability Associated With Pyridoxine-Responsive Epilepsies: The Need to Protect Cognitive Development. Front Psychiatry 2019; 10:116. [PMID: 30930802 PMCID: PMC6423912 DOI: 10.3389/fpsyt.2019.00116] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Accepted: 02/15/2019] [Indexed: 01/03/2023] Open
Abstract
Pyridoxine (vitamin B6)-responsive epilepsies are severe forms of epilepsy that manifest as seizures immediately after birth, sometimes in utero, sometimes months, or years after birth. Seizures may be treated efficiently by life-long supplementation with pyridoxine or its biologically active form, pyridoxal phosphate, but even so patients may become intellectually disabled, for which there currently is no effective treatment. The condition may be caused by mutations in several genes (TNSALP, PIGV, PIGL, PIGO, PNPO, PROSC, ALDH7A1, MOCS2, or ALDH4A1). Mutations in ALDH7A1, MOCS2, and ALDH4A1 entail build-up of reactive aldehydes (α-aminoadipic semialdehyde, γ-glutamic semialdehyde) that may react non-enzymatically with macromolecules of brain cells. Such reactions may alter the function of macromolecules, and they may produce "advanced glycation end products" (AGEs). AGEs trigger inflammation in the brain. This understanding points to aldehyde-quenching, anti-AGE, or anti-inflammatory therapies as possible strategies to protect cognitive development and prevent intellectual disability in affected children. Studies on how aldehydes traverse cell membranes and how they affect brain function could further the development of therapies for patients with pyridoxine-responsive epilepsies.
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Affiliation(s)
- Bjørnar Hassel
- Department for Neurohabilitation, Oslo University Hospital and University of Oslo, Oslo, Norway.,Norwegian Defence Research Establishment (FFI), Kjeller, Norway
| | - Ane Gretesdatter Rogne
- Department for Neurohabilitation, Oslo University Hospital and University of Oslo, Oslo, Norway
| | - Sigrun Hope
- Department for Neurohabilitation, Oslo University Hospital and University of Oslo, Oslo, Norway
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16
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Ekin S, Dogan M, Gok F, Karakus Y. Assessment of antioxidant enzymes, total sialic acid, lipid bound sialic acid, vitamins and selected amino acids in children with phenylketonuria. Pediatr Res 2018; 84:821-828. [PMID: 30135593 DOI: 10.1038/s41390-018-0137-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Revised: 04/27/2018] [Accepted: 07/16/2018] [Indexed: 11/09/2022]
Abstract
BACKGROUND In this study, children with phenylketonuria and healthy control subjects were assessed for glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), catalase (CAT) activity, malondialdehyde (MDA), glutathione (GSH), retinol, cholecalciferol, α-tocopherol, phylloquinone, total sialic acid (TSA), lipid bound sialic acid (LSA), total antioxidant (TAS), total oxidation (TOS), and amino acid levels, and the relationships of these variables with phenylketonuria were evaluated. METHODS The study included 60 children with phenylketonuria and 30 control subjects. Children with phenylketonuria were divided into hyperphenylalaninemia (HPA) and amino acid mixture (AAM) groups. RESULTS The HPA group had significantly lower levels of GSH-Px, CAT, GSH, TAS, α-aminobutyric acid, and taurine levels (p < 0.01, p < 0.05, p < 0.05, p < 0.001, p < 0.01, p < 0.05, respectively) than the control group. Additionally, the AAM group had significantly lower levels of CAT, TAS, and phylloquinones (p < 0.05, p < 0.05, p < 0.05, respectively) than the control group. It was observed in our study that in the HPA group, a significantly strong positive linear correlation was observed between phenylalanine and α-aminoadipic acid (r = 0.777; p = 0.002). CONCLUSIONS It was concluded that the levels of α-aminoadipic acid and phylloquinone might be an appropriate choice for the determination of phenylketonuria in parallel with the levels of phenylalanine. α-aminobutyric acid and phylloquinone as a supplement can decrease HPA damage.
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Affiliation(s)
- Suat Ekin
- Faculty of Science, Division of Biochemistry, Department of Chemistry, Yuzuncu Yil University, Van, Turkey.
| | - Murat Dogan
- Medical Faculty, Division of Pediatric Endocrinology, Department of Pediatrics, Yuzuncu Yil University, Van, Turkey
| | - Fazilet Gok
- Faculty of Science, Division of Biochemistry, Department of Chemistry, Yuzuncu Yil University, Van, Turkey
| | - Yağmur Karakus
- Faculty of Science, Division of Biochemistry, Department of Chemistry, Yuzuncu Yil University, Van, Turkey
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17
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Vanaveski T, Narvik J, Innos J, Philips MA, Ottas A, Plaas M, Haring L, Zilmer M, Vasar E. Repeated Administration of D-Amphetamine Induces Distinct Alterations in Behavior and Metabolite Levels in 129Sv and Bl6 Mouse Strains. Front Neurosci 2018; 12:399. [PMID: 29946233 PMCID: PMC6005828 DOI: 10.3389/fnins.2018.00399] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/24/2018] [Indexed: 01/30/2023] Open
Abstract
The main goal of the study was to characterize the behavioral and metabolomic profiles of repeated administration (for 11 days) of d-amphetamine (AMPH, 3 mg/kg i. p.), indirect agonist of dopamine (DA), in widely used 129S6/SvEvTac (129Sv) and C57BL/6NTac (Bl6) mouse strains. Acute administration of AMPH (acute AMPH) induced significantly stronger motor stimulation in Bl6. However, repeated administration of AMPH (repeated AMPH) caused stronger motor sensitization in 129Sv compared acute AMPH. Body weight of 129Sv was reduced after repeated saline and AMPH, whereas no change occurred in Bl6. In the metabolomic study, acute AMPH induced an elevation of isoleucine and leucine, branched chain amino acids (BCAA), whereas the level of hexoses was reduced in Bl6. Both BCAAs and hexoses remained on level of acute AMPH after repeated AMPH in Bl6. Three biogenic amines [asymmetric dimethylarginine (ADMA), alpha-aminoadipic acid (alpha-AAA), kynurenine] were significantly reduced after repeated AMPH. Acute AMPH caused in 129Sv a significant reduction of valine, lysophosphatidylcholines (lysoPC a C16:0, lysoPC a C18:2, lysoPC a C20:4), phosphatidylcholine (PC) diacyls (PC aa C34:2, PC aa C36:2, PC aa C36:3, PC aa C36:4) and alkyl-acyls (PC ae C38:4, PC ae C40:4). However, repeated AMPH increased the levels of valine and isoleucine, long-chain acylcarnitines (C14, C14:1-OH, C16, C18:1), PC diacyls (PC aa C38:4, PC aa C38:6, PC aa C42:6), PC acyl-alkyls (PC ae C38:4, PC ae C40:4, PC ae C40:5, PC ae C40:6, PC ae C42:1, PC ae C42:3) and sphingolipids [SM(OH)C22:1, SM C24:0] compared to acute AMPH in 129Sv. Hexoses and kynurenine were reduced after repeated AMPH compared to saline in 129Sv. The established changes probably reflect a shift in energy metabolism toward lipid molecules in 129Sv because of reduced level of hexoses. Pooled data from both strains showed that the elevation of isoleucine and leucine was a prominent biomarker of AMPH-induced behavioral sensitization. Simultaneously a significant decline of hexoses, citrulline, ADMA, and kynurenine occurred. The reduced levels of kynurenine, ADMA, and citrulline likely reflect altered function of N-methyl-D-aspartate (NMDA) and NO systems caused by repeated AMPH. Altogether, 129Sv strain displays stronger sensitization toward AMPH and larger variance in metabolite levels than Bl6.
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Affiliation(s)
- Taavi Vanaveski
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Jane Narvik
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Jürgen Innos
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Mari-Anne Philips
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Aigar Ottas
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
- Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Mario Plaas
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
- Psychiatry Clinic and Center of Excellence for Genomics and Translational Medicine, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Liina Haring
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
- Psychiatry Clinic, Tartu University Hospital, Tartu, Estonia
| | - Mihkel Zilmer
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
- Department of Biochemistry, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
| | - Eero Vasar
- Department of Physiology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia
- Center of Excellence for Genomics and Translational Medicine, University of Tartu, Tartu, Estonia
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18
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Iwagaki Y, Sugawara S, Huruya Y, Sato M, Wu Q, E S, Yamamoto K, Tsuduki T. The 1975 Japanese diet has a stress reduction effect in mice: search for physiological effects using metabolome analysis. Biosci Biotechnol Biochem 2018; 82:709-715. [DOI: 10.1080/09168451.2017.1417022] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Abstract
We aimed to find new physiological effects of the Japanese diet. First, to determine the key components in serum from mice fed the 1975 diet, serum from mice fed the 1960, 1975, 1990 or 2005 Japanese diet was analyzed using CE-TOFMS and LC-TOFMS. Based on these results, the key components were determined by principal component analysis. Among the identified compounds, GABA was included. Therefore, a stress reduction effect was inferred as a novel physiological effect of this diet. Next, we tested whether the 1975 diet had an actual stress reduction effect in mice. Mice were given the 1975 diet or a control diet for 4 weeks, after which they were divided into restraint stress and non-stress groups. Mice fed the 1975 diet had significantly decreased stress parameters compared with those fed the control diet. These results provide the first evidence that the 1975 Japanese diet has a stress reduction effect.
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Affiliation(s)
- Yui Iwagaki
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Saeko Sugawara
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Yasuhisa Huruya
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Miki Sato
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Qiming Wu
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Shuang E
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Kazushi Yamamoto
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
| | - Tsuyoshi Tsuduki
- Laboratory of Food and Biomolecular Science, Graduate School of Agriculture, Tohoku University, Sendai, Japan
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19
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Metabolic profile associated with distinct behavioral coping strategies of 129Sv and Bl6 mice in repeated motility test. Sci Rep 2018; 8:3405. [PMID: 29467440 PMCID: PMC5821849 DOI: 10.1038/s41598-018-21752-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 02/12/2018] [Indexed: 12/12/2022] Open
Abstract
We investigated the metabolic outcome of different coping strategies in 129S6/SvEvTac (129Sv) and C57BL/6Ntac (Bl6) strains. Two different batches of male 129Sv and Bl6 mice were used. One batch was not subjected to any behavioral manipulations (home cage control; HCC), whereas the other batch was treated with saline for 11 days and exposed after every treatment to the motor activity measurement (repeated motility tested; RMT). Bl6 RMT mice displayed a robust increase in number of rearings during repeated testing. 129Sv RMT mice experienced significant loss of body weight, but showed enhanced weight gain in HCC batch compared to Bl6. Serum metabolites (acylcarnitines, amino acids, biogenic amines, hexoses, glycerophospholipids and sphingolipids) were determined with AbsoluteIDQ p180 kit. Results of the metabolomic study revealed prominent peculiarities between strains in two different conditions. Comparison of both batches of mice demonstrated that in Bl6 biogenic amines (acetyl-ornithine, alpha-amionadipic acid, carnosine) and lysophosphatidylcholine PC(16:1/0:0) dominated. However in 129Sv acylcarnitine C5 clearly dominated, indicating shift towards short-chain acylcarnitines. Stable strain-specific ratios also emerged for both lines, ratio of glycine/PC ae C38:2 for Bl6 and ratios of C5/C0 as well as PC(16:0/0:0)/PC(16:1/0:0) for 129Sv. The described metabolic changes probably reflect different behavioral coping strategies of 129Sv and Bl6 mice.
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20
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Lajkó E, Tuka B, Fülöp F, Krizbai I, Toldi J, Magyar K, Vécsei L, Kőhidai L. Kynurenic acid and its derivatives are able to modulate the adhesion and locomotion of brain endothelial cells. J Neural Transm (Vienna) 2018; 125:899-912. [PMID: 29332257 DOI: 10.1007/s00702-018-1839-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 01/03/2018] [Indexed: 01/26/2023]
Abstract
The neuroprotective actions of kynurenic acid (KYNA) and its derivatives in several neurodegenerative disorders [characterized by damage to the cerebral endothelium and to the blood-brain barrier (BBB)] are well established. Cell-extracellular matrix (ECM) adhesion is supposedly involved in recovery of impaired cerebral endothelium integrity (endothelial repair). The present work aimed to investigate the effects of KYNA and its synthetic derivatives on cellular behaviour (e.g. adhesion and locomotion) and on morphology of the GP8 rat brain endothelial cell line, modeling the BBB endothelium. The effects of KYNA and its derivatives on cell adhesion were measured using an impedance-based technique, the xCELLigence SP system. Holographic microscopy (Holomonitor™ M4) was used to analyse both chemokinetic responses and morphometry. The GP8 cells proved to be a suitable model cell line for investigating cell adhesion and the locomotion modulator effects of kynurenines. KYNA enhanced cell adhesion and spreading, and also decreased the migration/motility of GP8 cells at physiological concentrations (10-9 and 10-7 mol/L). The derivatives containing an amide side-chain at the C2 position (KYNA-A1 and A2) had lower adhesion inducer effects compared to KYNA. All synthetic analogues (except KYNA-A5) had a time-dependent inhibitory effect on GP8 cell adhesion at a supraphysiological concentration (10-3 mol/L). The immobilization promoting effect of KYNA and the adhesion inducer activity of its derivatives indicate that these compounds could contribute to maintaining or restoring the protective function of brain endothelium; they also suggest that cell-ECM adhesion and related cell responses (e.g. migration/motility) could be potential new targets of KYNA.
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Affiliation(s)
- Eszter Lajkó
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary
| | - Bernadett Tuka
- MTA-SZTE Neuroscience Research Group, Semmelweis u. 6, Szeged, 6725, Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, Szeged, 6720, Hungary
- Stereochemistry Research Group of the Hungarian Academy of Sciences, Eötvös utca 6, Szeged, H-6720, Hungary
| | - István Krizbai
- Institute of Biophysics, Biological Research Centre of the Hungarian Academy of Sciences, Temesvári krt. 62, Szeged, 6726, Hungary
| | - József Toldi
- MTA-SZTE Neuroscience Research Group, Semmelweis u. 6, Szeged, 6725, Hungary
- Department of Physiology, Anatomy and Neuroscience, University of Szeged, Közép Fasor 52, Szeged, 6726, Hungary
| | - Kálmán Magyar
- Department of Pharmacodynamics, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary
| | - László Vécsei
- MTA-SZTE Neuroscience Research Group, Semmelweis u. 6, Szeged, 6725, Hungary
- Department of Neurology, University of Szeged, Semmelweis u. 6, Szeged, 6725, Hungary
| | - László Kőhidai
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, Budapest, 1089, Hungary.
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21
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Voss LJ, Harvey MG, Sleigh JW. Inhibition of astrocyte metabolism is not the primary mechanism for anaesthetic hypnosis. SPRINGERPLUS 2016; 5:1041. [PMID: 27462489 PMCID: PMC4940352 DOI: 10.1186/s40064-016-2734-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 06/30/2016] [Indexed: 11/10/2022]
Abstract
Astrocytes have been promoted as a possible mechanistic target for anaesthetic hypnosis. The aim of this study was to explore this using the neocortical brain slice preparation. The methods were in two parts. Firstly, multiple general anaesthetic compounds demonstrating varying in vivo hypnotic potency were analysed for their effect on "zero-magnesium" seizure-like event (SLE) activity in mouse neocortical slices. Subsequently, the effect of astrocyte metabolic inhibition was investigated in neocortical slices, and compared with that of the anaesthetic drugs. The rationale was that, if suppression of astrocytes was both necessary and sufficient to cause hypnosis in vivo, then inhibition of astrocytic metabolism in slices should mimic the anaesthetic effect. In vivo anaesthetic potency correlated strongly with the magnitude of reduction in SLE frequency in neocortical slices (R(2) 37.7 %, p = 0.002). Conversely, SLE frequency and length were significantly enhanced during exposure to both fluoroacetate (23 and 20 % increase, respectively, p < 0.01) and aminoadipate (12 and 38 % increase, respectively, p < 0.01 and p < 0.05). The capacity of an anaesthetic agent to reduce SLE frequency in the neocortical slice is a good indicator of its in vivo hypnotic potency. The results do not support the hypothesis that astrocytic metabolic inhibition is a mechanism of anaesthetic hypnosis.
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Affiliation(s)
- Logan J Voss
- Anaesthesia Department, Waikato District Health Board, Pembroke St, Hamilton, 3240 New Zealand
| | - Martyn G Harvey
- Emergency Department, Waikato District Health Board, Hamilton, 3240 New Zealand
| | - James W Sleigh
- University of Auckland Waikato Clinical School, Hamilton, 3240 New Zealand
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22
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Huang JH, Berkovitch SS, Iaconelli J, Watmuff B, Park H, Chattopadhyay S, McPhie D, Öngür D, Cohen BM, Clish CB, Karmacharya R. Perturbational Profiling of Metabolites in Patient Fibroblasts Implicates α-Aminoadipate as a Potential Biomarker for Bipolar Disorder. MOLECULAR NEUROPSYCHIATRY 2016; 2:97-106. [PMID: 27606323 DOI: 10.1159/000446654] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 05/04/2016] [Indexed: 12/27/2022]
Abstract
Many studies suggest the presence of aberrations in cellular metabolism in bipolar disorder. We studied the metabolome in bipolar disorder to gain insight into cellular pathways that may be dysregulated in bipolar disorder and to discover evidence of novel biomarkers. We measured polar and nonpolar metabolites in fibroblasts from subjects with bipolar I disorder and matched healthy control subjects, under normal conditions and with two physiologic perturbations: low-glucose media and exposure to the stress-mediating hormone dexamethasone. Metabolites that were significantly different between bipolar and control subjects showed distinct separation by principal components analysis methods. The most statistically significant findings were observed in the perturbation experiments. The metabolite with the lowest p value in both the low-glucose and dexamethasone experiments was α-aminoadipate, whose intracellular level was consistently lower in bipolar subjects. Our study implicates α-aminoadipate as a possible biomarker in bipolar disorder that manifests under cellular stress. This is an intriguing finding given the known role of α-aminoadipate in the modulation of kynurenic acid in the brain, especially as abnormal kynurenic acid levels have been implicated in bipolar disorder.
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Affiliation(s)
- Joanne H Huang
- Center for Experimental Drugs and Diagnostics, Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Harvard Medical School and Massachusetts General Hospital, Boston, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
| | - Shaunna S Berkovitch
- Center for Experimental Drugs and Diagnostics, Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Harvard Medical School and Massachusetts General Hospital, Boston, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
| | - Jonathan Iaconelli
- Center for Experimental Drugs and Diagnostics, Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Harvard Medical School and Massachusetts General Hospital, Boston, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
| | - Bradley Watmuff
- Center for Experimental Drugs and Diagnostics, Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Harvard Medical School and Massachusetts General Hospital, Boston, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
| | - Hyoungjun Park
- Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Mass., USA
| | - Shrikanta Chattopadhyay
- MGH Cancer Center, Boston, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
| | - Donna McPhie
- Schizophrenia and Bipolar Disorder Program, Harvard Medical School and McLean Hospital, Belmont, Mass., USA
| | - Dost Öngür
- Schizophrenia and Bipolar Disorder Program, Harvard Medical School and McLean Hospital, Belmont, Mass., USA
| | - Bruce M Cohen
- Schizophrenia and Bipolar Disorder Program, Harvard Medical School and McLean Hospital, Belmont, Mass., USA
| | - Clary B Clish
- Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
| | - Rakesh Karmacharya
- Center for Experimental Drugs and Diagnostics, Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Harvard Medical School and Massachusetts General Hospital, Boston, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA; Chemical Biology Program, Broad Institute of Harvard and MIT, Mass., USA
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23
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Han H, Xiao H, Lu Z. Short-term toxicity assessments of an antibiotic metabolite in Wistar rats and its metabonomics analysis by ultra-high performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry. Toxicol Appl Pharmacol 2016; 293:1-9. [PMID: 26780399 DOI: 10.1016/j.taap.2016.01.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Revised: 11/30/2015] [Accepted: 01/05/2016] [Indexed: 01/08/2023]
Abstract
4-Epi-oxytetracycline (4-EOTC), one of main oxytetracycline (OTC) metabolites, can be commonly detected in food and environment. The toxicity and effects of OTC on animals have been well characterized; however, its metabolites have never been studied systemically. This study aims to investigate 15-day oral dose toxicity and urine metabonomics changes of 4-EOTC after repeated administration in Wistar rats at daily doses of 0.5, 5.0 and 50.0mg/kg bw (bodyweight). Hematology and clinical chemistry parameters, including white blood cell count, red blood cell count, total protein, globulin and albumin/globulin, were obviously altered in rats of 5.0 and 50.0mg/kg bw. Histopathology changes of kidney and liver tissues were also observed in high-dose groups. Urinary metabolites from all groups were analyzed using ultra-high performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS). Seventeen metabolites contributing to the clusters were identified as potential biomarkers from multivariate analysis, including aminoadipic acid, 6-phosphogluconate, sebacic acid, pipecolic acid, etc. The significant changes of these biomarkers demonstrated metabonomic variations in treated rats, especially lysine and purine metabolism. For the first time in this paper, we combined the results of toxicity and metabonomics induced by 4-EOTC for the serious reconsideration of the safety and potential risks of antibiotics and its degradation metabolites.
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Affiliation(s)
- Hongxing Han
- College of Life Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China
| | - Hailong Xiao
- Hangzhou Institute for Food and Drug Control, Hangzhou 310004, China
| | - Zhenmei Lu
- College of Life Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, China.
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24
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Astrocytes as Pharmacological Targets in the Treatment of Schizophrenia. HANDBOOK OF BEHAVIORAL NEUROSCIENCE 2016. [DOI: 10.1016/b978-0-12-800981-9.00025-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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25
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Xie YY, Li L, Shao Q, Wang YM, Liang QL, Zhang HY, Sun P, Qiao MQ, Luo GA. Urinary metabolomics study on an induced-stress rat model using UPLC-QTOF/MS. RSC Adv 2015. [DOI: 10.1039/c5ra10992b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An integrated application of multivariable analysis and artificial intelligence was used for the first time to find potential biomarkers relating to the occurrence and development of liver-Qi syndrome PMS induced by electric stimulation in rats.
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Affiliation(s)
- Yuan-yuan Xie
- Department of Chemistry
- Tsinghua University
- Beijing 100084
- P. R. China
| | - Li Li
- Department of Chemistry
- Tsinghua University
- Beijing 100084
- P. R. China
- The Second College of Clinical Medicine
| | - Qun Shao
- School of Life Science
- University of Bradford
- Bradford
- UK
| | - Yi-ming Wang
- Department of Chemistry
- Tsinghua University
- Beijing 100084
- P. R. China
| | - Qiong-Lin Liang
- Department of Chemistry
- Tsinghua University
- Beijing 100084
- P. R. China
| | - Hui-Yun Zhang
- Shandong University of Traditional Chinese Medicine
- Jinan
- P. R. China
| | - Peng Sun
- Shandong University of Traditional Chinese Medicine
- Jinan
- P. R. China
| | - Ming-qi Qiao
- Shandong University of Traditional Chinese Medicine
- Jinan
- P. R. China
| | - Guo-An Luo
- Department of Chemistry
- Tsinghua University
- Beijing 100084
- P. R. China
- State Key Laboratory for Quality Research in Chinese Medicine
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26
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Šačkus A, Bričkutė D, Paliulis O, Sløk FA. Synthesis of Heterocyclic Analogs of α-aminoadipic Acid and its Esters Based on Imidazo[2,1-b][1,3]Thiazole. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Algirdas Šačkus
- Department of Organic Chemistry; Kaunas University of Technology; Kaunas LT-50254 Lithuania
- Institute of Synthetic Chemistry; Kaunas University of Technology; Kaunas LT-50254 Lithuania
| | - Diana Bričkutė
- Department of Organic Chemistry; Kaunas University of Technology; Kaunas LT-50254 Lithuania
| | - Osvaldas Paliulis
- Institute of Synthetic Chemistry; Kaunas University of Technology; Kaunas LT-50254 Lithuania
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27
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Yang H, Lin W, Zhang J, Lin W, Xu P, Li J, Ling X. Metabonomic analysis of the toxic effects of TM208 in rat urine by HPLC-ESI-IT-TOF/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 959:49-54. [PMID: 24747524 DOI: 10.1016/j.jchromb.2014.03.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 03/26/2014] [Accepted: 03/28/2014] [Indexed: 10/25/2022]
Abstract
4-Methylpiperazine-1-carbodithiocacid-3-cyano-3,3-diphenylpropyl ester hydrochloride (TM208) was a potential antitumor new drug with many preliminary studies in pharmacokinetics and pharmacodynamics. This study aims to determine whether TM208 elicits toxic effects by metabonomics for the first time. Sprague Dawley (SD) rats were exposured to TM208 at a single therapeutic dose (100mg/kg/d) for 5 days, metabolites of urine samples from both control and TM208-treated groups were analyzed using high performance liquid chromatography-electrospray ionization source in combination with hybrid ion trap and high-resolution time-of-flight mass spectrometry (HPLC-ESI-IT-TOF/MS). Metabolites such as aminoadipic acid, creatine, gluconic acid, cis-aconitic acid, succinic acid and pipecolic acid which changed significantly, were identified as potential biomarkers. These results suggest that the changes in urinary metabolites of rats after exposure to TM208 were mainly related to energy metabolism and amino acid metabolism, which may be helpful to further understand the mechanism of TM208 toxicity in rats and a new drug development.
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Affiliation(s)
- Haisong Yang
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China
| | - Wensi Lin
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China
| | - Jianmei Zhang
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China
| | - Weiwei Lin
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China
| | - Peng Xu
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China
| | - Jing Li
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China
| | - Xiaomei Ling
- State Key Laboratory of Natural and Biomimetic and Drugs and Department of Pharmaceutical Analysis, School of Pharmaceutical Sciences and Peking University, Beijing 100191, PR China.
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28
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Zhu W, Zhang SH, Feng B, Zhong K, Yang LX, Sun HL, Zhang SP, Xu Y, Wang CY, Pan XH. Reactive astrocytes contribute to increased epileptic susceptibility induced by subthreshold dose of pilocarpine. Epilepsy Behav 2012; 25:426-30. [PMID: 23123923 DOI: 10.1016/j.yebeh.2012.08.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Revised: 08/02/2012] [Accepted: 08/18/2012] [Indexed: 01/18/2023]
Abstract
Seizures may influence epileptogenesis, but it is not yet clearly established whether subthreshold stimulations that are not sufficient to induce visible behavioral seizures change epileptic susceptibility, and the possible underlying mechanisms have not been completely understood. We assessed the susceptibility to epilepsy after subthreshold dose of pilocarpine, as well as glial fibrillary acidic protein (GFAP) expression using immunohistochemistry. An increase in the susceptibility to pentylenetetrazole (PTZ)-induced seizures was observed in rats previously subjected to subthreshold dose of pilocarpine. The immunoreactivity of GFAP was also increased, indicating that astrocytes became reactive in some brain subfields. The increased epileptic susceptibility was significantly reduced by L-alpha-aminoadipic acid (L-AAA), an inhibitor of astrocytic function. Our results suggest that subthreshold stimulation may increase the susceptibility to subsequent development of epilepsy, and reactive astrocytes might be an important contributor to this process. Adequate inhibition of astrocytic function may be a potential preventive approach against epileptogenesis.
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Affiliation(s)
- Wei Zhu
- Radiation Medical Institute, Shandong Academy of Medical Sciences, Jinan 250062, China
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29
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Okuno A, Fukuwatari T, Shibata K. High tryptophan diet reduces extracellular dopamine release via kynurenic acid production in rat striatum. J Neurochem 2011; 118:796-805. [PMID: 21711351 DOI: 10.1111/j.1471-4159.2011.07369.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
At endogenous brain concentrations, the neuroinhibitory tryptophan metabolite kynurenic acid (KYNA) is a preferential antagonist of the α7 nicotinic acetylcholine receptor (α7nAChR). In the present study, male Wistar rats were fed a high tryptophan diet (adding 0.1-1.5% tryptophan) for 24 h to examine (i) the effect of increased tryptophan on extracellular dopamine (DA) and KYNA levels and (ii) to determine any possible interactions between DA and KYNA. Brain KYNA levels were dose-dependently increased by tryptophan intake, and these increase were consistent with kynurenine (KYN), the precursor to KYNA, levels in the brain, plasma and liver. Administration of the 1.5% tryptophan added diet reduced the extracellular DA level to 60%, and increased the extracellular KYNA to 320% in the striatum. The DA reduction was attenuated through inhibiting KYNA synthesis with 2-aminoadipic acid. These results indicate that a high tryptophan diet can induce KYNA production and suppress DA release. One possible mechanism is that as more KYN is metabolized from the high doses of tryptophan in the liver and released into the blood stream, KYNA production in astrocytes is enhanced and the increased extracellular KYNA inhibits DA release by blocking α7nAChRs. Dietary manipulation of KYNA formation in astrocytes may offer a unique strategy to modulate DA.
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Affiliation(s)
- Alato Okuno
- Department of Food Science and Nutrition, School of Human Cultures, The University of Shiga Prefecture, Shiga, Japan
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30
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Shen W, Li S, Chung SH, Gillies MC. Retinal vascular changes after glial disruption in rats. J Neurosci Res 2010; 88:1485-99. [PMID: 20029988 DOI: 10.1002/jnr.22317] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Glial dysfunction is found in a number of retinal vascular diseases but its link with blood-retinal barrier (BRB) breakdown remains poorly understood. The present study tested the hypothesis that glial dysfunction is a major contributor to the BRB breakdown that is a hallmark of retinal vascular diseases. We investigated the specificity of the purportedly selective glial toxin, DL-alpha-aminoadipic acid (DL-alpha-AAA) on different types of ocular cells in vitro and then tested the effect of glial disruption on retinal vasculature after intraocular injection of DL-alpha-AAA or siRNA targeting glutamine synthetase (GS) in rats. DL-alpha-AAA was toxic to astrocytes and Müller cells but not to other types of BRB-related cells in vitro. Subretinal injection of DL-alpha-AAA disrupted retinal glial cells, induced vascular telangiectasis and increased vascular permeability from 4 days to over 2 months post-injection. Vascular changes induced by DL-alpha-AAA were observed predominantly in regions of glial disruption, as reflected by reduced expression of GS and increased expression of glial fibrillary acidic protein and vimentin. Confocal microscopy showed changes in all three layers of the retinal vasculature, which co-localised with areas of Müller cell disruption. Double labeling immunohistochemistry revealed that retinal glial disruption after DL-alpha-AAA injection was accompanied by increased expression of vascular endothelial growth factor and reduced expression of the tight junction protein claudin-5. Intravitreal injection of GS siRNA induced similar changes in Müller cells and BRB breakdown. Our data are consistent with the hypothesis that glial dysfunction is a primary contributor to the BRB breakdown in retinal vascular diseases.
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Affiliation(s)
- Weiyong Shen
- Save Sight Institute, University of Sydney, Sydney, Australia.
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31
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Swann J, Wang Y, Abecia L, Costabile A, Tuohy K, Gibson G, Roberts D, Sidaway J, Jones H, Wilson ID, Nicholson J, Holmes E. Gut microbiome modulates the toxicity of hydrazine: a metabonomic study. MOLECULAR BIOSYSTEMS 2009; 5:351-5. [PMID: 19396371 DOI: 10.1039/b811468d] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of gut microbiota on the toxicity and metabolism of hydrazine has been investigated in germ-free and 'conventional' Sprague Dawley rats using 1H NMR based metabonomic analysis of urine and plasma. Toxicity was more severe in germ-free rats compared with conventional rats for equivalent exposures indicating that bacterial presence altered the nature or extent of response to hydrazine and that the toxic response can vary markedly in the absence of a functional microbiome.
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Affiliation(s)
- Jonathan Swann
- Department of Biomolecular Medicine, Division of Surgery, Oncology, Reproductive Biology and Anaesthetics (SORA), Faculty of Medicine, Imperial College London, South Kensington Campus, London SW72AZ, UK
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32
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Bang JW, Crockford DJ, Holmes E, Pazos F, Sternberg MJE, Muggleton SH, Nicholson JK. Integrative top-down system metabolic modeling in experimental disease states via data-driven Bayesian methods. J Proteome Res 2008; 7:497-503. [PMID: 18179164 DOI: 10.1021/pr070350l] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Multivariate metabolic profiles from biofluids such as urine and plasma are highly indicative of the biological fitness of complex organisms and can be captured analytically in order to derive top-down systems biology models. The application of currently available modeling approaches to human and animal metabolic pathway modeling is problematic because of multicompartmental cellular and tissue exchange of metabolites operating on many time scales. Hence, novel approaches are needed to analyze metabolic data obtained using minimally invasive sampling methods in order to reconstruct the patho-physiological modulations of metabolic interactions that are representative of whole system dynamics. Here, we show that spectroscopically derived metabolic data in experimental liver injury studies (induced by hydrazine and alpha-napthylisothiocyanate treatment) can be used to derive insightful probabilistic graphical models of metabolite dependencies, which we refer to as metabolic interactome maps. Using these, system level mechanistic information on homeostasis can be inferred, and the degree of reversibility of induced lesions can be related to variations in the metabolic network patterns. This approach has wider application in assessment of system level dysfunction in animal or human studies from noninvasive measurements.
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Affiliation(s)
- Jung-Wook Bang
- Department of Biomolecular Medicine, Division of Surgery, Oncology, Reproductive Biology & Anaesthetics, Sir Alexander Fleming Building, Imperial College, London SW7 2AZ, UK
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33
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Guidetti P, Schwarcz R. Determination of alpha-aminoadipic acid in brain, peripheral tissues, and body fluids using GC/MS with negative chemical ionization. ACTA ACUST UNITED AC 2004; 118:132-9. [PMID: 14559362 DOI: 10.1016/j.molbrainres.2003.08.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
alpha-Aminoadipic acid (alphaAA) is a structural homolog of the excitatory amino acid glutamate and a natural product of lysine metabolism in mammalian cells. Under experimental conditions, alphaAA can influence various elements of glutamatergic neurotransmission. Moreover, as a selective inhibitor of kynurenine aminotransferase II, alphaAA is capable of decreasing the levels of the neuroinhibitory metabolite kynurenic acid in the brain. We now describe the identification of this potential endogenous neuromodulator in tissues and body fluids by gas chromatography/mass spectrometry (GC/MS) analysis of its pentafluorobenzyl (PFB) derivative. alphaAA was recovered from the GC column with a retention time of approximately 7 min. Subsequent MS analysis using electron capture with negative ionization revealed two separate ions for alphaAA (m/z 520, approximately 45% and m/z 322, approximately 55%). Both of these ions were positively identified with two different GC methodologies. In the rat, alphaAA levels ranged from 5 to 30 microM in various brain areas and from 8 to 40 microM in peripheral organs, whereas serum and urine contained only 1-2 microM alphaAA. Levels in the human brain were 18.7+/-2.4 microM (cortex) and 18.0+/-1.7 microM (striatum) alphaAA (n=9 each), and the mouse forebrain contained 8.3+/-1.9 microM alphaAA (n=6). Neuronal depletion, caused in rats by an intrastriatal injection of NMDA (300 nmol/2.5 microl), did not alter the striatal content of alphaAA, indicating that brain alphaAA resides at least in part in glial cells. alphaAA may therefore function as a glia-derived modulator of excitatory neurotransmission.
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Affiliation(s)
- Paolo Guidetti
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, P.O. Box 21247, Baltimore, MD 21228, USA
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34
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A Clinicobiochemical Study of Tryptophan and Other Plasma and Urinary Amino Acids in the Family With Hartnup Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2003. [DOI: 10.1007/978-1-4615-0135-0_36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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35
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Pawlak D, Takada Y, Urano T, Takada A. Serotonergic and kynurenic pathways in rats exposed to foot shock. Brain Res Bull 2000; 52:197-205. [PMID: 10822161 DOI: 10.1016/s0361-9230(00)00252-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Electric foot shock was applied to rats and levels of tryptophan and its metabolites were measured in the plasma, central nervous system and peripheral tissues. Metabolites of tryptophan are the results of the enhancement of serotonergic and kynurenine pathways. Plasma levels of tryptophan increased significantly immediately after the foot shock and returned to normal values within 24 h. Tryptophan levels also increased in all the brain areas immediately after stress application and returned to normal values within 24 h. Foot shock elevated the levels of kynurenine in the plasma, liver, kidney and every parts of the brain. 3-Hydroxykynurenine and kynurenic acid levels were increased in the brain. The present observations suggest that stress activates not only serotonergic pathway but also kynurenine pathway in the central nervous system and periphery. Some metabolites of kynurenine pathway, such as 3-hydroxykynurenine, are neurotoxic while other metabolite, such as kynurenic acid, may be neuroprotective. Increase in serotonin level in the hypothalamus and midbrain stabilises emotion and prevents mood disorders. Therefore, some brain dysfunction resulting from stress may be prevented by the metabolites of tryptophan. The balance of these functions may be important in the maintenance of nerve integrity under stress conditions.
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Affiliation(s)
- D Pawlak
- Department of Pharmacodynamics, Medical Academy, Bialystok, Poland
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36
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Hodgkins PS, Wu HQ, Zielke HR, Schwarcz R. 2-Oxoacids regulate kynurenic acid production in the rat brain: studies in vitro and in vivo. J Neurochem 1999; 72:643-51. [PMID: 9930736 DOI: 10.1046/j.1471-4159.1999.0720643.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
This study was designed to examine the role of 2-oxoacids in the enzymatic transamination of L-kynurenine to the excitatory amino acid receptor antagonist, kynurenate, in the rat brain. In brain tissue slices incubated in Krebs-Ringer buffer with a physiological concentration of L-kynurenine, pyruvate, and several other straight- and branched-chain 2-oxoacids, substantially restored basal kynurenate production in a dose-dependent manner without increasing the intracellular concentration of L-kynurenine. All 2-oxoacids tested also reversed or attenuated the hypoglycemia-induced decrease in kynurenate synthesis, but only pyruvate and oxaloacetate also substantially restored intracellular L-kynurenine accumulation. Thus, 2-oxoacids increase kynurenate formation in the brain primarily by functioning as co-substrates of the transamination reaction. This was supported further by the fact that the nonspecific kynurenine aminotransferase inhibitors (aminooxy)acetic acid and dichlorovinylcysteine prevented the effect of pyruvate on kynurenate production in a dose-dependent manner. Moreover, all 2-oxoacids tested attenuated or prevented the effects of veratridine, quisqualate, or L-alpha-aminoadipate, which reduce the transamination of L-kynurenine to kynurenate. Finally, dose-dependent increases in extracellular kynurenate levels in response to an intracerebral perfusion with pyruvate or alpha-ketoisocaproate were demonstrated by in vivo microdialysis. Taken together, these data show that 2-oxoacids can directly augment the de novo production of kynurenate in several areas of the rat brain. 2-Oxoacids may therefore provide a novel pharmacological approach for the manipulation of excitatory amino acid receptor function and dysfunction.
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Affiliation(s)
- P S Hodgkins
- Maryland Psychiatric Research Center, Baltimore 21228, USA
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Tsai MJ, Chang YF, Schwarcz R, Brookes N. Characterization of L-alpha-aminoadipic acid transport in cultured rat astrocytes. Brain Res 1996; 741:166-73. [PMID: 9001719 DOI: 10.1016/s0006-8993(96)00910-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The mechanism of the selective gliotoxicity of L-alpha-aminoadipate (L-alpha AA) is thought to involve its entry into glia as a substrate for glutamate transporters or, alternatively, its ability to inhibit glial glutamate transport. To clarify the properties of L-alpha AA as a transport substrate, we explored the ionic dependence, kinetics and pharmacology of L-[3H] alpha AA uptake in rat cortical astrocytes. We observed two components of saturable L-alpha AA uptake, one Na(+)-dependent and the other Na(+)-independent. These components exhibited the characteristics of system X-AG, the widespread family of Na(+)-cotransporters of aspartate and glutamate, and system x-c, a Cl(-)-dependent glutamate/cystine exchanger, respectively. The K(m) value of Na(+)-dependent L-alpha AA uptake was 629 +/- 42 microM, and Vmax was 62 +/- 4 nmol.min-1.mg-1 protein, which was more than twice the capacity of Na(+)-dependent glutamate uptake. The kinetic parameters of Na(+)-dependent L-alpha AA uptake (K(m) of 20 +/- 2 microM, Vmax of 1.7 +/- 0.4 nmol.min-1.mg-1 protein did not differ from the values for Na(+)-independent glutamate uptake, indicating that L-alpha AA and glutamate are equally good substrates for system x-c.
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Affiliation(s)
- M J Tsai
- Department of Oral and Craniofacial Biological Sciences, University of Maryland Dental School, Baltimore, USA.
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Wu HQ, Schwarcz R. Seizure activity causes elevation of endogenous extracellular kynurenic acid in the rat brain. Brain Res Bull 1996; 39:155-62. [PMID: 8866691 DOI: 10.1016/0361-9230(95)02087-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
This study was designed to examine the effects of several classic convulsants on the extracellular concentration of the anticonvulsant and neuroprotective brain metabolite kynurenic acid (KYNA) in the rat brain. Drug effects were investigated in vivo, mostly by unilateral microdialysis in the dorsal hippocampus. Systemic administration of pentylenetetrazole (60 mg/kg, SC), pilocarpine (325 mg/kg, SC), bicuculline (6 mg/kg, SC), or kainic acid (10 mg/kg, SC) caused characteristic clonic and/or tonic convulsions. In all seizure paradigms, KYNA levels in the dialysate began to rise within 1 h and gradually reached a plateau approximately 4 h after administration of the convulsants. Peak increases were 1.5-3-fold over basal levels. The duration of the elevation in KYNA levels was significantly prolonged following kainic acid application. In the kainic acid model, extracellular KYNA was also measured and found to be increased in the ventral hippocampus, piriform cortex, and striatum. Moreover, temporary intrahippocampal infusion of the KYN synthesis inhibitor aminooxyacetic acid (1 mM) in the kainic acid- and pentylenetetrazole models attenuated the increase in extracellular KYNA levels, demonstrating that de novo production of KYNA in the brain accounts for the seizure-induced KYNA overflow. A separate group of animals received a unilateral intrahippocampal injection of the endogenous convulsant excitotoxin quinolinic acid (120 nmol) and showed long-lasting (> 24 h) bilateral increases in extracellular KYNA levels. Taken together, these data indicate that an increase in extracellular KYNA may constitute a common occurrence in response to seizures and that KYNA elevations may signify the brain's attempt to counteract seizure activity.
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Affiliation(s)
- H Q Wu
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore 21228, USA
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Curatolo L, Caccia C, Speciale C, Raimondi L, Cini M, Marconi M, Molinari A, Schwarcz R. Modulation of extracellular kynurenic acid content by excitatory amino acids in primary cultures of rat astrocytes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1996; 398:273-6. [PMID: 8906277 DOI: 10.1007/978-1-4613-0381-7_43] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Wu HQ, Monno A, Schwarcz R, Vezzani A. Electrical kindling is associated with a lasting increase in the extracellular levels of kynurenic acid in the rat hippocampus. Neurosci Lett 1995; 198:91-4. [PMID: 8592649 DOI: 10.1016/0304-3940(95)11971-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Endogenous kynurenic acid (KYNA), an excitatory amino acid receptor antagonist with antineurotoxic and anticonvulsant activity, was assessed by microdialysis in the hippocampus of kindled rats. One week after the completion of amygdala or hippocampal kindling (stage 5), the dialysate concentration of KYNA in the hippocampus of both hemispheres was 1.7 +/- 0.1-fold higher than in shams (P < 0.01). Veratridine (50 microM), applied through the probe, reduced extracellular KYNA by 28% within 1 h in controls (P < 0.05), but was ineffective in stage 5 kindled rats. At the preconvulsive stage 2, dialysate KYNA concentration and the effect of veratridine were similar to controls. The activity of KYNA's biosynthetic enzyme, kynurenine aminotransferase, did not change in the hippocampus 1 week after stage 5 seizures. These data indicate an enhanced liberation of KYNA in teh hippocampus of fully kindled animals due to an impairment of normal regulatory mechanisms. This may be of relevance for the control of hippocampal excitability during epileptogenesis.
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Affiliation(s)
- H Q Wu
- Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore 21228, USA
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