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Glutamate metabolism

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https://www.readbyqxmd.com/read/27933363/spatially-resolved-metabolic-distribution-for-unraveling-the-physiological-change-and-responses-in-tomato-fruit-using-matrix-assisted-laser-desorption-ionization-mass-spectrometry-imaging-maldi-msi
#1
Junya Nakamura, Tomomi Morikawa-Ichinose, Yoshinori Fujimura, Eisuke Hayakawa, Katsutoshi Takahashi, Takanori Ishii, Daisuke Miura, Hiroyuki Wariishi
Information on spatiotemporal metabolic behavior is indispensable for a precise understanding of physiological changes and responses, including those of ripening processes and wounding stress, in fruit, but such information is still limited. Here, we visualized the spatial distribution of metabolites within tissue sections of tomato (Solanum lycopersicum L.) fruit using a matrix-assisted laser desorption/ionization-mass spectrometry imaging (MALDI-MSI) technique combined with a matrix sublimation/recrystallization method...
December 8, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27931189/adaptation-of-propionibacterium-freudenreichii-to-long-term-survival-under-gradual-nutritional-shortage
#2
Flavia Figueira Aburjaile, Marine Rohmer, Hugues Parrinello, Marie-Bernadette Maillard, Eric Beaucher, Gwénaële Henry, Aurélie Nicolas, Marie-Noëlle Madec, Anne Thierry, Sandrine Parayre, Stéphanie-Marie Deutsch, Muriel Cocaign-Bousquet, Anderson Miyoshi, Vasco Azevedo, Yves Le Loir, Hélène Falentin
BACKGROUND: Propionibacterium freudenreichii is an Actinobacterium widely used in the dairy industry as a ripening culture for Swiss-type cheeses, for vitamin B12 production and some strains display probiotic properties. It is reportedly a hardy bacterium, able to survive the cheese-making process and digestive stresses. RESULTS: During this study, P. freudenreichii CIRM-BIA 138 (alias ITG P9), which has a generation time of five hours in Yeast Extract Lactate medium at 30 °C under microaerophilic conditions, was incubated for 11 days (9 days after entry into stationary phase) in a culture medium, without any adjunct during the incubation...
December 8, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27929065/functional-characterization-of-aconitase-x-as-a-cis-3-hydroxy-l-proline-dehydratase
#3
Seiya Watanabe, Kunihiko Tajima, Satoshi Fujii, Fumiyasu Fukumori, Ryotaro Hara, Rio Fukuda, Mao Miyazaki, Kuniki Kino, Yasuo Watanabe
In the aconitase superfamily, which includes the archetypical aconitase, homoaconitase, and isopropylmalate isomerase, only aconitase X is not functionally annotated. The corresponding gene (LhpI) was often located within the bacterial gene cluster involved in L-hydroxyproline metabolism. Screening of a library of (hydroxy)proline analogues revealed that this protein catalyzes the dehydration of cis-3-hydroxy-L-proline to Δ(1)-pyrroline-2-carboxylate. Furthermore, electron paramagnetic resonance and site-directed mutagenic analyses suggests the presence of a mononuclear Fe(III) center, which may be coordinated with one glutamate and two cysteine residues...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27927966/tolerogenic-dendritic-cells-from-poorly-compensated-type-1-diabetes-patients-have-decreased-ability-to-induce-stable-antigen-specific-t-cell-hyporesponsiveness-and-generation-of-suppressive-regulatory-t-cells
#4
Klára Dáňová, Anna Grohová, Pavla Strnadová, David P Funda, Zdeněk Šumník, Jan Lebl, Ondřej Cinek, Štěpánka Průhová, Stanislava Koloušková, Barbora Obermannová, Lenka Petruželková, Anna Šedivá, Petra Fundová, Karsten Buschard, Radek Špíšek, Lenka Palová-Jelínková
Tolerogenic dendritic cells (tolDCs) may offer an interesting intervention strategy to re-establish Ag-specific tolerance in autoimmune diseases, including type 1 diabetes (T1D). T1D results from selective destruction of insulin-producing β cells leading to hyperglycemia that, in turn, specifically affects a patient's immune system. In this study, we prepared monocyte-derived tolDCs modulated by dexamethasone and vitamin D2 from 31 T1D patients with optimal glycemic control and 60 T1D patients with suboptimal glycemic control and assessed their tolerogenic properties in correlation with metabolic state of patients...
December 7, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27919740/metabolic-differences-between-cold-stored-and-machine-perfused-porcine-kidneys-a-1-h-nmr-based-study
#5
Jay Nath, Tom B Smith, Kamlesh Patel, Sam R Ebbs, Alex Hollis, Daniel A Tennant, Christian Ludwig, Andrew R Ready
Hypothermic machine perfusion (HMP) and static cold storage (SCS) are the two methods used to preserve deceased donor kidneys prior to transplant. This study seeks to characterise the metabolic profile of HMP and SCS porcine kidneys in a cardiac death donor model. Twenty kidneys were cold flushed and stored for two hours following retrieval. Paired kidneys then underwent 24 h of HMP or SCS or served as time zero controls. Metabolite quantification in both storage fluid and kidney tissue was performed using one dimensional (1)H NMR spectroscopy...
December 2, 2016: Cryobiology
https://www.readbyqxmd.com/read/27919695/metabolomics-identifies-perturbations-in-amino-acid-metabolism-in-the-prefrontal-cortex-of-the-learned-helplessness-rat-model-of-depression
#6
Xinyu Zhou, Lanxiang Liu, Yuqing Zhang, Juncai Pu, Lining Yang, Chanjuan Zhou, Shuai Yuan, Hanping Zhang, Peng Xie
Major depressive disorder is a serious psychiatric condition associated with high rates of suicide and is a leading cause of health burden worldwide. However, the underlying molecular mechanisms of major depression are still essentially unclear. In our study, a non-targeted gas chromatography-mass spectrometry-based metabolomics approach was used to investigate metabolic changes in the prefrontal cortex of the learned helplessness rat model of depression. Body-weight measurements and behavioral tests including the active escape test, sucrose preference test, forced swimming test, elevated plus-maze and open field test were used to assess changes in the behavioral spectrum after inescapable footshock stress...
December 2, 2016: Neuroscience
https://www.readbyqxmd.com/read/27919624/metabolic-fate-of-glucose-in-rats-with-traumatic-brain-injury-and-pyruvate-or-glucose-treatments-a-nmr-spectroscopy-study
#7
Katsunori Shijo, Richard L Sutton, Sima S Ghavim, Neil G Harris, Brenda L Bartnik-Olson
Administration of sodium pyruvate (SP; 9.08 μmol/kg, i.p.), ethyl pyruvate (EP; 0.34 μmol/kg, i.p.) or glucose (GLC; 11.1 μmol/kg, i.p.) to rats after unilateral controlled cortical impact (CCI) injury has been reported to reduce neuronal loss and improve cerebral metabolism. In the present study these doses of each fuel or 8% saline (SAL; 5.47 nmoles/kg) were administered immediately and at 1, 3, 6 and 23 h post-CCI. At 24 h all CCI groups and non-treated Sham injury controls were infused with [1,2 (13)C] glucose for 68 min (13)C nuclear magnetic resonance (NMR) spectra were obtained from cortex + hippocampus tissues from left (injured) and right (contralateral) hemispheres...
December 2, 2016: Neurochemistry International
https://www.readbyqxmd.com/read/27915162/high-fat-diet-induces-metabolic-changes-and-reduces-oxidative-stress-in-female-mouse-hearts
#8
Ignasi Barba, Elisabet Miró-Casas, José L Torrecilla, Eulàlia Pladevall, Sergi Tejedor, Rubén Sebastián-Pérez, Marisol Ruiz-Meana, José R Berrendero, Antonio Cuevas, David García-Dorado
After an acute myocardial infarction, obese patients generally have a better prognosis than their leaner counterparts, known as the "obesity paradox". In addition, female sex is associated with a lower risk of cardiac ischemic events and smaller infarct size compared to males. The objective of the present work was to study the metabolic phenotype and mitochondrial function associated to female sex and short-term high-fat diet. (1)H NMR spectra of mice heart extracts were analysed by mRMR variable selection and linear discriminant analysis was used to evaluate metabolic changes...
November 15, 2016: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/27913829/glutamate-fermentation-2-mechanism-of-l-glutamate-overproduction-in-corynebacterium-glutamicum
#9
Takashi Hirasawa, Masaaki Wachi
The nonpathogenic coryneform bacterium, Corynebacterium glutamicum, was isolated as an L-glutamate-overproducing microorganism by Japanese researchers and is currently utilized in various amino acid fermentation processes. L-Glutamate production by C. glutamicum is induced by limitation of biotin and addition of fatty acid ester surfactants and β-lactam antibiotics. These treatments affect the cell surface structures of C. glutamicum. After the discovery of C. glutamicum, many researchers have investigated the underlying mechanism of L-glutamate overproduction with respect to the cell surface structures of this organism...
December 3, 2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/27913184/tolerance-of-hyperammonemia-in-brain-of-heteropneustes-fossilis-is-supported-by-glutamate-glutamine-cycle
#10
Suman Mishra, Rajnikant Mishra
This report presents analysis of molecular switches associated with tolerance to hyperammonemia in Heteropneustes fossilis because it tolerates about 100-fold more ammonia than mammals. Brains of Heteropneustes fossilis exposed to 100mM ammonium chloride were dissected after Zero hour as control, 16hrs and 20hrs exposure. The status of neuron and glia were analysed by Golgi staining, Luxol Fast Blue, and Nissl's staining. The expression patterns of genes associated to homeostasis of neuron and glia, management of oxidative stress and inflammation, ammonia metabolism and brain derived neurotrophic factor were analysed through reverse-transcriptase-polymerase chain reaction...
November 29, 2016: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/27913012/hyperglycemic-high-anion-gap-metabolic-acidosis-in-patients-receiving-sglt-2-inhibitors-for-diabetes-management
#11
Juliette Sandifer Kum-Nji, Aidar R Gosmanov, Helmut Steinberg, Samuel Dagogo-Jack
Sodium-glucose cotransporter-2 inhibitors (SGLT-2i) are a class of antidiabetic medications that improve glycemic control via inhibiting the reabsorption of filtered glucose and are approved for use in type 2 diabetes (T2DM). These drugs have recently been associated with euglycemic diabetic ketoacidosis (DKA). An increasing number of cases of SGLT-2i-associated DKA have occurred in patients with T2DM. Herein, we describe five episodes of hyperglycemic DKA in four type 2 diabetes patients receiving SGLT-2i therapy...
November 9, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27911855/glutamine-and-glutaminolysis-are-required-for-efficient-replication-of-infectious-spleen-and-kidney-necrosis-virus-in-chinese-perch-brain-cells
#12
Xiaozhe Fu, Xianqin Hu, Ningqiu Li, Feifei Zheng, Xingxing Dong, Jing Duan, Qiang Lin, Jiagang Tu, Lijuan Zhao, Zhibin Huang, Jianguo Su, Li Lin
Viruses rely on host cellular metabolism for energy and macromolecule synthesis during their replication. Infectious spleen and kidney necrosis virus (ISKNV) causes significant economic losses in the Chinese perch (Siniperca chuatsi) industry worldwide. However, little is known about the relationship between ISKNV replication and cellular metabolism. Using transcriptomic analysis, we observed that glutamine metabolism in Chinese perch brain (CPB) cells is altered during ISKNV infection. Moreover, ISKNV replication was decreased in CPB cells cultured in the glutamine-depleted medium...
November 29, 2016: Oncotarget
https://www.readbyqxmd.com/read/27911093/dna-microarray-profiling-highlights-nrf2-mediated-chemoprevention-targeted-by-wasabi-derived-isothiocyanates-in-hepg2-cells
#13
Phoebe Zapanta Trio, Atsuyoshi Kawahara, Shunsuke Tanigawa, Kozue Sakao, De-Xing Hou
6-MSITC and 6-MTITC are sulforaphane (SFN) analogs found in Japanese Wasabi. As we reported previously, Wasabi isothiocyanates (ITCs) are activators of Nrf2-antioxidant response element pathway, and also inhibitors of pro-inflammatory cyclooxygenase-2. This study is the first to assess the global changes in transcript levels by Wasabi ITCs, comparing with SFN, in HepG2 cells. We performed comparative gene expression profiling by treating HepG2 cells with ITCs, followed by DNA microarray analyses using HG-U133 plus 2...
December 2, 2016: Nutrition and Cancer
https://www.readbyqxmd.com/read/27909856/metabolic-changes-in-the-bilateral-visual-cortex-of-the-monocular-blind-macaque-a-multi-voxel-proton-magnetic-resonance-spectroscopy-study
#14
Lingjie Wu, Zuohua Tang, Xiaoyuan Feng, Xinghuai Sun, Wen Qian, Jie Wang, Lixin Jin, Jingxuan Jiang, Yufeng Zhong
The metabolic changes accompanied with adaptive plasticity in the visual cortex after early monocular visual loss were unclear. In this study, we detected the metabolic changes in bilateral visual cortex of normal (group A) and monocular blind macaque (group B) for studying the adaptive plasticity using multi-voxel proton magnetic resonance spectroscopy ((1)H-MRS) at 32 months after right optic nerve transection. Then, we compared the N-Acetyl aspartate (NAA)/Creatine (Cr), myoinositol (Ins)/Cr, choline (Cho)/Cr and Glx (Glutamate + glutamine)/Cr ratios in the visual cortex between two groups, as well as between the left and right visual cortex of group A and B...
December 1, 2016: Neurochemical Research
https://www.readbyqxmd.com/read/27909736/discovery-and-history-of-amino-acid-fermentation
#15
Shin-Ichi Hashimoto
There has been a strong demand in Japan and East Asia for L-glutamic acid as a seasoning since monosodium glutamate was found to present umami taste in 1907. The discovery of glutamate fermentation by Corynebacterium glutamicum in 1956 enabled abundant and low-cost production of the amino acid, creating a large market. The discovery also prompted researchers to develop fermentative production processes for other L-amino acids, such as lysine. Currently, the amino acid fermentation industry is so huge that more than 5 million metric tons of amino acids are manufactured annually all over the world, and this number continues to grow...
December 2, 2016: Advances in Biochemical Engineering/biotechnology
https://www.readbyqxmd.com/read/27908782/adaptive-responses-of-neuronal-mitochondria-to-bioenergetic-challenges-roles-in-neuroplasticity-and-disease-resistance
#16
REVIEW
Sophia M Raefsky, Mark P Mattson
An important concept in neurobiology is "neurons that fire together, wire together" which means that the formation and maintenance of synapses is promoted by activation of those synapses. Very similar to the effects of the stress of exercise on muscle cells, emerging findings suggest that neurons respond to activity by activating signaling pathways (e.g., Ca(2+), CREB, PGC-1α, NF-κB) that stimulate mitochondrial biogenesis and cellular stress resistance. These pathways are also activated by aerobic exercise and food deprivation, two bioenergetic challenges of fundamental importance in the evolution of the brains of all mammals, including humans...
November 29, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27907112/role-of-heterogeneous-macromolecular-crowding-and-geometrical-irregularity-at-central-excitatory-synapses-in-shaping-synaptic-transmission
#17
Rahul Gupta, Melissa Reneaux, Karmeshu
Besides the geometrical tortousity due to the extrasynaptic structures, macromolecular crowding and geometrical irregularities constituting the cleft composition at central excitatory synapses has a major and direct role in retarding the glutamate diffusion within the cleft space. However, the cleft composition may not only coarsely reduce the overall diffusivity of the glutamate but may also lead to substantial spatial variation in the diffusivity across the cleft space. Decrease in the overall diffusivity of the glutamate may have straightforward consequences to the glutamate transients in the cleft...
2016: PloS One
https://www.readbyqxmd.com/read/27902689/using-intrinsic-flavoprotein-and-nad-p-h-imaging-to-map-functional-circuitry-in-the-main-olfactory-bulb
#18
Cedric R Uytingco, Adam C Puche, Steven D Munger
Neurons exhibit strong coupling of electrochemical and metabolic activity. Increases in intrinsic fluorescence from either oxidized flavoproteins or reduced nicotinamide adenine dinucleotide (phosphate) [NAD(P)H] in the mitochondria have been used as an indicator of neuronal activity for the functional mapping of neural circuits. However, this technique has not been used to investigate the flow of olfactory information within the circuitry of the main olfactory bulb (MOB). We found that intrinsic flavoprotein fluorescence signals induced by electrical stimulation of single glomeruli displayed biphasic responses within both the glomerular (GL) and external plexiform layers (EPL) of the MOB...
2016: PloS One
https://www.readbyqxmd.com/read/27898758/evolutionary-profiling-of-group-ii-pyridoxal-phosphate-dependent-decarboxylases-suggests-expansion-and-functional-diversification-of-histidine-decarboxylases-in-tomato
#19
Rahul Kumar, Gitanjali Jiwani, Amit Pareek, Thula SravanKumar, Ashima Khurana, Arun K Sharma
Pyridoxal phosphate (PLP)-dependent enzymes are one of the most important enzymes involved in plant N metabolism. Here, we explored the evolution of group II PLP-dependent decarboxylases (PLP_deC), including aromatic L-amino acid decarboxylase, glutamate decarboxylase, and histidine decarboxylase in the plant lineage. Gene identification analysis revealed a higher number of genes encoding PLP_deC in higher plants than in lower plants. Expression profiling of PLP_deC orthologs and syntelogs in (L.) Heynh., pepper ( L...
March 2016: Plant Genome
https://www.readbyqxmd.com/read/27897443/evaluation-of-biochemical-composition-of-vitreous-of-eyes-of-diabetic-patients-using-proton-magnetic-resonance-spectroscopy
#20
Ilke Bahceci Simsek, Ozgur Artunay
PURPOSE: To investigate possible metabolic changes in vitreous of patients with diabetes mellitus with or without diabetic retinopathy using proton magnetic resonance spectroscopy. MATERIAL AND METHODS: Twenty-eight healthy control subjects (group 1), 18 patients with diabetes mellitus without diabetic retinopathy (group 2) and 18 patients with diabetic retinopathy (group 3) were included. Proton magnetic resonance spectroscopy was performed in left vitreous of all subjects; amounts of Glutamate, Choline, Lactate and Creatine values were measured...
November 29, 2016: Current Eye Research
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