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Glutamate metabolism

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https://www.readbyqxmd.com/read/29777624/characterisation-of-a-putative-glutamate-5-kinase-from-leishmania-donovani
#1
Natasha Sienkiewicz, Han B Ong, Alan H Fairlamb
Previous metabolic studies have demonstrated that leishmania parasites are able to synthesise proline from glutamic acid and threonine from aspartic acid. The first committed step in both biosynthetic pathways involves an amino acid kinase, either a glutamate 5-kinase (EC 2.7.2.11) or an aspartokinase (EC 2.7.2.4). Bioinformatic analysis of multiple leishmania genomes identifies a single amino-acid-kinase gene (LdBPK 262740.1) variously annotated as either a putative glutamate or aspartate kinase. To establish the catalytic function of this Leishmania donovani gene product, we have determined the physical and kinetic properties of the recombinant enzyme purified from Escherichia coli...
May 19, 2018: FEBS Journal
https://www.readbyqxmd.com/read/29777493/transgenic-mice-carrying-glud2-as-a-tool-for-studying-the-expressional-and-the-functional-adaptation-of-this-positive-selected-gene-in-human-brain-evolution
#2
Andreas Plaitakis, Dimitra Kotzamani, Zoe Petraki, Maria Delidaki, Vagelis Rinotas, Ioannis Zaganas, Eleni Douni, Kyriaki Sidiropoulou, Cleanthe Spanaki
Human evolution is characterized by brain expansion and up-regulation of genes involved in energy metabolism and synaptic transmission, including the glutamate signaling pathway. Glutamate is the excitatory transmitter of neural circuits sub-serving cognitive functions, with glutamate-modulation of synaptic plasticity being central to learning and memory. GLUD2 is a novel positively-selected human gene involved in glutamatergic transmission and energy metabolism that underwent rapid evolutionary adaptation concomitantly with prefrontal cortex enlargement...
May 18, 2018: Neurochemical Research
https://www.readbyqxmd.com/read/29775942/toxicological-effects-on-earthworms-eisenia-fetida-exposed-to-sub-lethal-concentrations-of-bde-47-and-bde-209-from-a-metabolic-point
#3
Ruoyu Liang, Juan Chen, Yajuan Shi, Yonglong Lu, Suriyanarayanan Sarvajayakesavalu, Xiangbo Xu, Xiaoqi Zheng, Kifayatullah Khan, Chao Su
Earthworms improve the soil fertility and they are also sensitive to soil contaminants. Earthworms (Eisenia fetida), standard reference species, were usually chosen to culture and handle for toxicity tests. Metabolic responses in earthworms exposed to 2, 2', 4, 4'-tetrabromodiphenyl ether (BDE-47) and decabromodiphenyl ether (BDE-209) were inhibitory and interfered with basal metabolism. In this study, 1 H-NMR based metabolomics was used to identify sensitive biomarkers and explore metabolic responses of earthworms under sub-lethal BDE-47 and BDE-209 concentrations for 14 days...
May 15, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29774215/importance-of-functional-loss-of-fus-in-ftld-als
#4
REVIEW
Shinsuke Ishigaki, Gen Sobue
Fused in sarcoma (FUS) is an RNA binding protein that regulates RNA metabolism including alternative splicing, transcription, and RNA transportation. FUS is genetically and pathologically involved in frontotemporal lobar degeneration (FTLD)/amyotrophic lateral sclerosis (ALS). Multiple lines of evidence across diverse models suggest that functional loss of FUS can lead to neuronal dysfunction and/or neuronal cell death. Loss of FUS in the nucleus can impair alternative splicing and/or transcription, whereas dysfunction of FUS in the cytoplasm, especially in the dendritic spines of neurons, can cause mRNA destabilization...
2018: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/29770168/blood-and-tissue-enzymatic-activities-of-gdh-and-ldh-index-of-glutathione-and-oxidative-stress-among-breast-cancer-patients-attending-referral-hospitals-of-addis-ababa-ethiopia-hospital-based-comparative-cross-sectional-study
#5
Mohammed Mehdi, M K C Menon, Nebiyou Seyoum, Mahteme Bekele, Wondimagegn Tigeneh, Daniel Seifu
The exact cause of breast cancer is unknown; it is a multifactorial disease. It is the most diagnosed and the second killer cancer among women. Breast cancer can be originated from tissues of breast or secondary from other organs via metastasis. Generally, cancer cells show aberrant metabolism and oxidative stress when compared to noncancerous tissues of breast cancer patients. The current study aims at evaluating glutamate and glucose metabolism through GDH and LDH enzyme activities, oxidant, and antioxidative status among breast cancer patients attending referral hospitals of Addis Ababa, Ethiopia...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29769578/metabolomic-profile-of-systemic-sclerosis-patients
#6
Federica Murgia, Silvia Svegliati, Simone Poddighe, Milena Lussu, Aldo Manzin, Tatiana Spadoni, Colomba Fischetti, Armando Gabrielli, Luigi Atzori
Systemic sclerosis (SSc) is an autoimmune disease of unknown aetiology characterized by vascular lesions, immunological alterations and diffuse fibrosis of the skin and internal organs. Since recent evidence suggests that there is a link between metabolomics and immune mediated disease, serum metabolic profile of SSc patients and healthy controls was investigated by 1 H-NMR and GC-MS techniques. The results indicated a lower level of aspartate, alanine, choline, glutamate, and glutarate in SSc patients compared with healthy controls...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29768250/metabolic-regulation-of-synaptic-activity
#7
Sergei V Fedorovich, Tatyana V Waseem
Brain tissue is bioenergetically expensive. In humans, it composes approximately 2% of body weight and accounts for approximately 20% of calorie consumption. The brain consumes energy mostly for ion and neurotransmitter transport, a process that occurs primarily in synapses. Therefore, synapses are expensive for any living creature who has brain. In many brain diseases, synapses are damaged earlier than neurons start dying. Synapses may be considered as vulnerable sites on a neuron. Ischemic stroke, an acute disturbance of blood flow in the brain, is an example of a metabolic disease that affects synapses...
May 16, 2018: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/29768217/integrative-characterization-of-the-r6-2-mouse-model-of-huntington-s-disease-reveals-dysfunctional-astrocyte-metabolism
#8
Niels H Skotte, Jens V Andersen, Alberto Santos, Blanca I Aldana, Cecilie W Willert, Anne Nørremølle, Helle S Waagepetersen, Michael L Nielsen
Huntington's disease is a fatal neurodegenerative disease, where dysfunction and loss of striatal and cortical neurons are central to the pathogenesis of the disease. Here, we integrated quantitative studies to investigate the underlying mechanisms behind HD pathology in a systems-wide manner. To this end, we used state-of-the-art mass spectrometry to establish a spatial brain proteome from late-stage R6/2 mice and compared this with wild-type littermates. We observed altered expression of proteins in pathways related to energy metabolism, synapse function, and neurotransmitter homeostasis...
May 15, 2018: Cell Reports
https://www.readbyqxmd.com/read/29766217/involvement-of-extrasynaptic-glutamate-in-physiological-and-pathophysiological-changes-of-neuronal-excitability
#9
REVIEW
Balázs Pál
Glutamate is the most abundant neurotransmitter of the central nervous system, as the majority of neurons use glutamate as neurotransmitter. It is also well known that this neurotransmitter is not restricted to synaptic clefts, but found in the extrasynaptic regions as ambient glutamate. Extrasynaptic glutamate originates from spillover of synaptic release, as well as from astrocytes and microglia. Its concentration is magnitudes lower than in the synaptic cleft, but receptors responding to it have higher affinity for it...
May 15, 2018: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29765386/design-of-a-type-1-diabetes-vaccine-candidate-using-edible-plants-expressing-a-major-autoantigen
#10
Edoardo Bertini, Matilde Merlin, Elisa Gecchele, Andrea Puggia, Annalisa Brozzetti, Mauro Commisso, Alberto Falorni, Vittorio Bini, Victor Klymyuk, Mario Pezzotti, Linda Avesani
Type-1 diabetes (T1D) is a metabolic disease involving the autoimmune destruction of insulin-producing pancreatic beta cells. It is often diagnosed by the detection of autoantibodies, typically those recognizing insulin itself or the 65-kDa isoform of glutamic acid decarboxylase (GAD65). Oral insulin can be used to induce systemic immunological tolerance and thus prevent or delay the onset of T1D, suggesting that combination treatments with other autoantigens such as GAD65 could be even more successful. GAD65 has induced oral tolerance and prevented T1D in preclinical studies but it is difficult to produce in sufficient quantities for clinical testing...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29764985/responses-to-systemic-nitrogen-signaling-in-arabidopsis-roots-involve-trans-zeatin-in-shoots
#11
Arthur Poitout, Amandine Crabos, Ivan Petřík, Ondřej Novák, Gabriel Krouk, Benoît Lacombe, Sandrine Ruffel
Plants face temporal and spatial variation in nitrogen (N) availability. This includes heterogeneity in soil nitrate (NO3-) content. To overcome these constraints, plants modify their gene expression and physiological processes to optimize N acquisition. This plasticity relies on a complex long-distance root-shoot-root signaling network that remains poorly understood. We previously showed that cytokinin (CK) biosynthesis is required to trigger systemic N signaling. Here, we performed split-root experiments and used a combination of CK-related mutant analyses, hormone profiling, transcriptomic analysis, NO3- uptake assays, and root growth measurements to gain insight into systemic N signaling in Arabidopsis thaliana...
May 15, 2018: Plant Cell
https://www.readbyqxmd.com/read/29764521/amino-acid-transporter-slc7a11-xct-at-the-crossroads-of-regulating-redox-homeostasis-and-nutrient-dependency-of-cancer
#12
REVIEW
Pranavi Koppula, Yilei Zhang, Li Zhuang, Boyi Gan
Cancer cells often upregulate nutrient transporters to fulfill their increased biosynthetic and bioenergetic needs, and to maintain redox homeostasis. One nutrient transporter frequently overexpressed in human cancers is the cystine/glutamate antiporter solute carrier family 7 member 11 (SLC7A11; also known as xCT). SLC7A11 promotes cystine uptake and glutathione biosynthesis, resulting in protection from oxidative stress and ferroptotic cell death. Recent studies have unexpectedly revealed that SLC7A11 also plays critical roles in glutamine metabolism and regulates the glucose and glutamine dependency of cancer cells...
April 25, 2018: Cancer communications
https://www.readbyqxmd.com/read/29764289/divergent-induction-of-branched-chain-aminotransferases-and-phosphorylation-of-branched-chain-keto-acid-dehydrogenase-is-a-potential-mechanism-coupling-bcka-mediated-astrocyte-activation-to-bcaa-depletion-mediated-cognitive-deficit-after-tbi
#13
Guoqiang Xing, Ming Ren, Ajay Verma
Deficient branched chain amino acids (BCAAs) are implicated in cognitive dysfunction after traumatic brain injury (TBI). The mechanism remains unknown. BCAAs are catabolized by neuron-specific cytosolic and astrocyte-specific mitochondrial branched chain aminotransferases (BCATc, BCATm) to generate glutamate and branched-chain keto-acids (BCKAs) that are metabolized via the mitochondrial branched-chain-keto-acid dehydrogenase (BCKD) whose activity is regulated by its phosphorylation state. BCKD phosphorylation by BCKD kinase (BCKDK) inactivates BCKD and cause neuro-cognitive dysfunction, whereas de-phosphorylation by specific phosphatase restores BCKD activity...
May 15, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29763372/acetyl-coa-from-inflammation-induced-fatty-acids-oxidation-promotes-hepatic-malate-aspartate-shuttle-activity-and-glycolysis
#14
Tongxin Wang, Weilei Yao, Ji Li, Qiongyu He, Yafei Shao, Feiruo Huang
Hepatic metabolic syndrome is associated with inflammation, as it stimulates the reprogramming of nutrient metabolism and hepatic mitochondria-generated acetyl-CoA. But how acetyl-CoA affects the reprogramming of nutrient metabolism, especially glucose and fatty acids, in the condition of inflammation is still unclear. Here, we used an acute inflammation model in which pigs were injected with lipopolysaccharide (LPS), and found that hepatic glycolysis and fatty acid oxidation are both promoted. Acetyl-proteome profiling of LPS-infected pigs liver showed that inflammatory stress exacerbates the acetylation of mitochondrial proteins...
May 15, 2018: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29760952/downregulation-of-the-psychiatric-susceptibility-gene-cacna1c-promotes-mitochondrial-resilience-to-oxidative-stress-in-neuronal-cells
#15
Susanne Michels, Goutham K Ganjam, Helena Martins, Gerhard M Schratt, Markus Wöhr, Rainer K W Schwarting, Carsten Culmsee
Affective disorders such as major depression and bipolar disorder are among the most prevalent forms of mental illness and their etiologies involve complex interactions between genetic and environmental risk factors. Over the past ten years, several genome wide association studies (GWAS) have identified CACNA1C as one of the strongest genetic risk factors for the development of affective disorders. However, its role in disease pathogenesis is still largely unknown. Vulnerability to affective disorders also involves diverse environmental risk factors such as perinatal insults, childhood maltreatment, and other adverse pathophysiological or psychosocial life events...
2018: Cell Death Discovery
https://www.readbyqxmd.com/read/29760789/higher-cardiometabolic-risk-in-idiopathic-versus-autoimmune-type-1-diabetes-a-retrospective-analysis
#16
Valentina Guarnotta, Enrica Vigneri, Giuseppe Pillitteri, Alessandro Ciresi, Giuseppe Pizzolanti, Carla Giordano
Background: Idiopathic type 1 diabetes mellitus (IDM) is characterized by an onset with insulinopenia and ketoacidosis with negative β-cell autoimmunity markers and lack of association with HLA. The aim of the study is to compare the clinical and metabolic parameters, the macro and microvascular complications, the adipose tissue dysfunction and the insulin secretion and sensitivity indexes in patients with IDM and autoimmune type 1 diabetes mellitus (ADM) at clinical onset. Methods: Thirty patients with IDM and 30 with ADM, matched for age and gender, were retrospectively analyzed...
2018: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/29755345/analogous-%C3%AE-carboline-alkaloids-harmaline-and-harmine-ameliorate-scopolamine-induced-cognition-dysfunction-by-attenuating-acetylcholinesterase-activity-oxidative-stress-and-inflammation-in-mice
#17
Shu-Ping Li, Yu-Wen Wang, Sheng-Lan Qi, Yun-Peng Zhang, Gang Deng, Wen-Zheng Ding, Chao Ma, Qi-Yan Lin, Hui-Da Guan, Wei Liu, Xue-Mei Cheng, Chang-Hong Wang
The analogous β-carboline alkaloids, harmaline (HAL) and harmine (HAR), possess a variety of biological properties, including acetylcholinesterase (AChE) inhibitory activity, antioxidant, anti-inflammatory, and many others, and have great potential for treating Alzheimer's disease (AD). However, studies have showed that the two compounds have similar structures and in vitro AChE inhibitory activities but with significant difference in bioavailability. The objective of this study was to comparatively investigate the effects of HAL and HAR in memory deficits of scopolamine-induced mice...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29752971/metabolomic-analysis-of-overactive-bladder-in-male-patients-identification-of-potential-metabolite-biomarkers
#18
Hiroshi Shimura, Takahiko Mitsui, Satoru Kira, Tatsuya Ihara, Norifumi Sawada, Hiroshi Nakagomi, Tatsuya Miyamoto, Sachiko Tsuchiya, Mie Kanda, Masayuki Takeda
OBJECTIVES: To identify metabolites that are associated with an overactive bladder (OAB) using metabolomics. PATIENTS AND METHODS: A total of 58 males without apparent neurological disease completed 24-hr bladder diaries of their micturition behavior and International Prostate Symptom Score (IPSS) for the assessment of micturition behavior and lower urinary tract symptoms. Urgency was defined as an IPSS urgency score of ≥2 (OAB group), and patients with IPSS urgency scores of ≤1 belonged to the control group...
May 9, 2018: Urology
https://www.readbyqxmd.com/read/29752731/metabolomic-comparison-between-wild-ophiocordyceps-sinensis-and-artificial-cultured-cordyceps-militaris
#19
Lin Chen, Yuetao Liu, Qingfeng Guo, Qingxia Zheng, Wancun Zhang
In this study, a systematic research on the metabolome differences between wild Ophiocordyceps sinensis (O. sinensis) and artificial cultured Cordyceps militaris (C. militaris) was conducted using liquid chromatography-mass spectrometry. Principal components analysis (PCA) and Orthogonal projection on latent structure-discriminant analysis (OPLS-DA) results showed that C. militaris grown on solid rice medium (R-CM) and C. militaris grown on tussah pupa (T-CM) evidently separated and individually separated from wild O...
May 11, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29752710/inflammation-in-psychiatric-disorders-what-comes-first
#20
REVIEW
Moisés E Bauer, Antonio L Teixeira
Neuropsychiatric disorders (i.e., mood disorders and schizophrenia) and inflammation are closely intertwined, and possibly powering each other in a bidirectional loop. Depression facilitates inflammatory reactions and inflammation promotes depression and other neuropsychiatric disorders. Patients with neuropsychiatric disorders exhibit all cardinal features of inflammation, including increased circulating levels of inflammatory inducers, activated sensors, and inflammatory mediators targeting all tissues. Inflammation may contribute to the pathophysiology and clinical progression of these disorders...
May 11, 2018: Annals of the New York Academy of Sciences
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