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citric acid cycle

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https://www.readbyqxmd.com/read/28331816/inhibition-of-fat-cell-differentiation-in-3t3-l1-pre-adipocytes-by-all-trans-retinoic-acid-integrative-analysis-of-transcriptomic-and-phenotypic-data
#1
Katharina Stoecker, Steffen Sass, Fabian J Theis, Hans Hauner, Michael W Pfaffl
The process of adipogenesis is controlled in a highly orchestrated manner, including transcriptional and post-transcriptional events. In developing 3T3-L1 pre-adipocytes, this program can be interrupted by all-trans retinoic acid (ATRA). To examine this inhibiting impact by ATRA, we generated large-scale transcriptomic data on the microRNA and mRNA level. Non-coding RNAs such as microRNAs represent a field in RNA turnover, which is very important for understanding the regulation of mRNA gene expression. High throughput mRNA and microRNA expression profiling was performed using mRNA hybridisation microarray technology and multiplexed expression assay for microRNA quantification...
March 2017: Biomolecular Detection and Quantification
https://www.readbyqxmd.com/read/28322963/the-effect-of-oxaloacetic-acid-on-tyrosinase-activity-and-structure-integration-of-inhibition-kinetics-with-docking-simulation
#2
Lin Gou, Jinhyuk Lee, Hao Hao, Yong-Doo Park, Yi Zhan, Zhi-Rong Lü
Oxaloacetic acid (OA) is naturally found in organisms and well known as an intermediate of citric acid cycle producing ATP. We evaluated the effects of OA on tyrosinase activity and structure via integrating methods of enzyme kinetics and computational simulations. OA was found to be a reversible inhibitor of tyrosinase and its induced mechanism was the parabolic non-competitive inhibition type (IC50=17.5±0.5mM and Ki=6.03±1.36mM). Kinetic measurements by real-time interval assay showed that OA induced multi-phasic inactivation process composing with fast (k1) and slow (k2) phases...
March 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28317951/facile-synthesis-of-nanoporous-li1-xv1-xo2-c-composites-as-promising-anode-materials-for-lithium-ion-batteries
#3
Peng Mei, Malay Pramanik, Jaewoo Lee, Toshiaki Takei, Yusuke Ide, Md Shahriar A Hossain, Jung Ho Kim, Yusuke Yamauchi
Recently, a layered material with composition Li1+xV1-xO2 has been discovered as a promising alternative anode material to graphite due to its high volumetric capacity and low operation potential. Herein, we demonstrate a mild and cost-effective synthetic methodology to construct a novel nanoporous anode material (P-LVO@C), comprising Li1+xV1-xO2 nanocrystals embedded in a porous carbon matrix. The thermal decomposition of organic materials, including a triblock copolymer (P123) and citric acid, in a N2 atmosphere is the source of the nanoporous carbon in the porous composite material, while citric acid also plays a crucial role in maintaining the reductive environment of the synthetic medium...
March 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28300620/catabolism-of-gaba-succinic-semialdehyde-or-gamma-hydroxybutyrate-through-the-gaba-shunt-impair-mitochondrial-substrate-level-phosphorylation
#4
Dora Ravasz, Gergely Kacso, Viktoria Fodor, Kata Horvath, Vera Adam-Vizi, Christos Chinopoulos
GABA is catabolized in the mitochondrial matrix through the GABA shunt, encompassing transamination to succinic semialdehyde followed by oxidation to succinate by the concerted actions of GABA transaminase (GABA-T) and succinic semialdehyde dehydrogenase (SSADH), respectively. Gamma-hydroxybutyrate (GHB) is a neurotransmitter and a psychoactive drug that could enter the citric acid cycle through transhydrogenation with α-ketoglutarate to succinic semialdehyde and d-hydroxyglutarate, a reaction catalyzed by hydroxyacid-oxoacid transhydrogenase (HOT)...
March 11, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28290889/-platelet-metabolism-in-clopidogrel-resistant-and-sensitive-patients-with-ischemic-heart-disease
#5
I Yu Grinshtein, A A Savchenko, Yu I Grinshtein, I V Filonenko, A A Kosinova
OBJECTIVE: to investigate relationship between activity of platelet nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP) dependent dehydrogenases in patients with ischemic heart disease (IHD) after coronary artery bypass grafting (CABG) and their sensitivity to clopidogrel. MATERIAL AND METHODS: We studied 51 male patients with chronic IHD before and after CABG. Control group comprised 35 healthy men. In IHD patients spontaneous and induced platelet aggregation was measured by aggregometry before CABG (in 2 weeks after cessation of antiplatelet drugs), after CABG during therapy with clopidogrel (75 mg/day), and in 6 months after surgery...
October 2016: Kardiologiia
https://www.readbyqxmd.com/read/28283247/environmentally-friendly-and-non-polluting-solvent-pretreatment-of-palm-samples-for-polyphenol-analysis-using-choline-chloride-deep-eutectic-solvents
#6
Najing Fu, Runqiu Lv, Zhixin Guo, Yiwei Guo, Xiaoyu You, Baokun Tang, Dandan Han, Hongyuan Yan, Kyung Ho Row
In this work, choline chloride (ChCl) deep eutectic solvents (DESs) were evaluated for the pretreatment of palm samples in the analysis of polyphenols, such as protocatechuic acid, catechins, epicatechin, and caffeic acid. During the enrichment step of the pretreatment, eight DESs comprising ChCl with ethylene glycol (EG), glycerol (Gly), xylitol (Xyl), phenol (Ph), formic acid (FA), citric acid (CiA), oxalic acid (OA), or malonic acid (MA), were prepared and applied to the reflux extraction of polyphenols from palm samples...
February 21, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28271489/the-pyruvate-dehydrogenase-complex-and-related-assemblies-in-health-and-disease
#7
Olwyn Byron, John Gordon Lindsay
The family of 2-oxoacid dehydrogenase complexes (2-OADC), typified by the pyruvate dehydrogenase multi-enzyme complex (PDC) as its most prominent member, are massive molecular machines (Mr, 4-10 million) controlling key steps in glucose homeostasis (PDC), citric acid cycle flux (OGDC, 2-oxoglutarate dehydrogenase) and the metabolism of the branched-chain amino acids, leucine, isoleucine and valine (BCOADC, branched-chain 2-OADC). These highly organised mitochondrial arrays, composed of multiple copies of three separate enzymes, have been widely studied as paradigms for the analysis of enzyme cooperativity, substrate channelling, protein-protein interactions and the regulation of activity by phosphorylation ...
2017: Sub-cellular Biochemistry
https://www.readbyqxmd.com/read/28262773/metabolomics-for-clinical-use-and-research-in-chronic-kidney-disease
#8
REVIEW
Berthold Hocher, Jerzy Adamski
Chronic kidney disease (CKD) has a high prevalence in the general population and is associated with high mortality; a need therefore exists for better biomarkers for diagnosis, monitoring of disease progression and therapy stratification. Moreover, very sensitive biomarkers are needed in drug development and clinical research to increase understanding of the efficacy and safety of potential and existing therapies. Metabolomics analyses can identify and quantify all metabolites present in a given sample, covering hundreds to thousands of metabolites...
March 6, 2017: Nature Reviews. Nephrology
https://www.readbyqxmd.com/read/28259101/mitochondrial-composition-and-function-under-the-control-of-hypoxia
#9
REVIEW
Dominik C Fuhrmann, Bernhard Brüne
Hypoxia triggers several mechanisms to adapt cells to a low oxygen environment. Mitochondria are major consumers of oxygen and a potential source of reactive oxygen species (ROS). In response to hypoxia they exchange or modify distinct subunits of the respiratory chain and adjust their metabolism, especially lowering the citric acid cycle. Intermediates of the citric acid cycle participate in regulating hypoxia inducible factors (HIF), the key mediators of adaptation to hypoxia. Here we summarize how hypoxia conditions mitochondria with consequences for ROS-production and the HIF-pathway...
February 24, 2017: Redox Biology
https://www.readbyqxmd.com/read/28256132/facile-synthesis-of-nanosized-lithium-ion-conducting-solid-electrolyte-li1-4al0-4ti1-6-po4-3-and-its-mechanical-nanocomposites-with-limn2o4-for-enhanced-cyclic-performance-in-lithium-ion-batteries
#10
Xingang Liu, Jiang Tan, Ju Fu, Ruoxin Yuan, Hao Wen, Chuhong Zhang
Nanoparticles of fast lithium-ion-conducting solid electrolyte Li1.4Al0.4Ti1.6(PO4)3 (LATP) are prepared by a modified citric-acid-assisted sol-gel method that involves a two-step heat treatment in which the dry gel is calcined first in argon and then in air. The obtained LATP exhibits smaller particle size (down to 40 nm) with a narrower size distribution and less aggregation than LATP prepared by a conventional sol-gel method because of a polymeric network that preserves during LATP crystallization. It has a high relative density of 97...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28224688/liver-tissue-metabolic-profiling-and-pathways-of-nonalcoholic-steatohepatitis-in-rats
#11
Suwen Qi, Si Huang, Xin Chen, Qin Huo, Ni Xie, Jun Xia
AIM: The mechanisms of nonalcoholic steatohepatitis (NASH) in hepatocytes is unknown, and our aim is to study the tissue metabolic profiling and pathways of NASH. METHODS: We built rat models for simple steatosis and NASH and analyzed the liver extract using a liquid chromatograph-mass spectrometer (LC-MS). The acquired data were processed by multivariate principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA) to obtain metabolic profiling...
February 22, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/28218705/accumulation-of-carotenoids-and-metabolic-profiling-in-different-cultivars-of-tagetes-flowers
#12
Yun Ji Park, Soo-Yun Park, Mariadhas Valan Arasu, Naif Abdullah Al-Dhabi, Hyung-Geun Ahn, Jae Kwang Kim, Sang Un Park
Species of Tagetes, which belong to the family Asteraceae show different characteristics including, bloom size, shape, and color; plant size; and leaf shape. In this study, we determined the differences in primary metabolites and carotenoid yields among six cultivars from two Tagetes species, T. erecta and T. patula. In total, we detected seven carotenoids in the examined cultivars: violaxanthin, lutein, zeaxanthin, α-carotene, β-carotene, 9-cis-β-carotene, and 13-cis-β-carotene. In all the cultivars, lutein was the most abundant carotenoid...
February 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28191851/delicate-structural-control-of-si-siox-c-composite-via-high-speed-spray-pyrolysis-for-li-ion-battery-anodes
#13
Seung Jong Lee, Hye Jin Kim, Tae Hoon Hwang, Sunghun Choi, Sung Hyeon Park, Erhan Deniz, Dae Soo Jung, Jang Wook Choi
Despite the high theoretical capacity, silicon (Si) anodes in lithium-ion batteries have difficulty in meeting the commercial standards in various aspects. In particular, the huge volume change of Si makes it very challenging to simultaneously achieve high initial Coulombic efficiency (ICE) and long-term cycle life. Herein, we report spray pyrolysis to prepare Si-SiOx composite using an aqueous precursor solution containing Si nanoparticles, citric acid, and sodium hydroxide (NaOH). In the precursor solution, Si nanoparticles are etched by NaOH with the production of [SiO4](4-)...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28189066/mdh2-stimulated-by-estrogen-gpr30-pathway-down-regulated-pten-expression-promoting-the-proliferation-and-invasion-of-cells-in-endometrial-cancer
#14
Yan Zhuang, Jiangdong Xiang, Wei Bao, Ya Sun, Lina Wang, Meihua Tan, Yinyan He, Xiaowei Xi
PURPOSE: The relationship between endometrial carcinoma and cellular metabolism is unknown. In endometrial cancer, mutation rate of PTEN has been reported very high. Malate dehydrogenase 2 (MDH2) is one of the isoforms of malate dehydrogenase, which is involved in citric acid cycle in mitochondria. Our study aimed to investigate the role MDH2 played in PTEN-regulated endometrial carcinoma. METHODS: To reveal the expression of MDH2 and the co-localization of PTEN and MDH2, immunohistochemistry and immunofluorescent staining were used...
April 2017: Translational Oncology
https://www.readbyqxmd.com/read/28185090/enamel-wear-by-antagonistic-restorative-materials-under-erosive-conditions
#15
Annette Wiegand, Aleksandra Credé, Claudia Tschammler, Thomas Attin, Tobias T Tauböck
OBJECTIVES: This study aimed to analyse loss of enamel worn against composite, leucite glass ceramic or enamel antagonists under non-erosive and alternating or simultanuous erosive-attritive conditions. MATERIALS AND METHODS: Flat human enamel specimens were loaded (1 Hz, 300 g loading weight, each subgroup n = 12) with antagonists made from a hybrid-composite (Z250, 3 M Espe), a nano-composite (Filtek Supreme XTE, 3 M Espe), leucite glass ceramic (IPS Empress CAD LT, Ivoclar Vivadent) or enamel...
February 9, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28177875/metabolomic-signature-associated-with-reproduction-regulated-aging-in-caenorhabditis-elegans
#16
Qin-Li Wan, Xiaohuo Shi, Jiangxin Liu, Ai-Jun Ding, Yuan-Zhu Pu, Zhigang Li, Gui-Sheng Wu, Huai-Rong Luo
In Caenorhabditis elegans (C. elegans), ablation of germline stem cells (GSCs) leads to infertility, which extends lifespan. It has been reported that aging and reproduction are both inextricably associated with metabolism. However, few studies have investigated the roles of polar small molecules metabolism in regulating longevity by reproduction. In this work, we combined the nuclear magnetic resonance (NMR) and ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) to profile the water-soluble metabolome in C...
February 6, 2017: Aging
https://www.readbyqxmd.com/read/28165055/human-embryonic-and-induced-pluripotent-stem-cells-maintain-phenotype-but-alter-their-metabolism-after-exposure-to-rock-inhibitor
#17
Spyros I Vernardis, Konstantinos Terzoudis, Nicki Panoskaltsis, Athanasios Mantalaris
Human pluripotent stem cells (hPSCs) are adhesion-dependent cells that require cultivation in colonies to maintain growth and pluripotency. Robust differentiation protocols necessitate single cell cultures that are achieved by use of ROCK (Rho kinase) inhibitors. ROCK inhibition enables maintenance of stem cell phenotype; its effects on metabolism are unknown. hPSCs were exposed to 10 μM ROCK inhibitor for varying exposure times. Pluripotency (TRA-1-81, SSEA3, OCT4, NANOG, SOX2) remained unaffected, until after prolonged exposure (96 hrs)...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28159812/right-ventricular-metabolism-during-veno-arterial-extracorporeal-membrane-oxygenation-in-immature-swine-heart-in-vivo
#18
Masaki Kajimoto, Dolena R Ledee, Nancy G Isern, Michael A Portman
Veno-arterial extracorporeal membrane oxygenation (VA-ECMO) provides hemodynamic rescue for patients encountering right or left ventricular (RV or LV) decompensation, particularly after surgery for congenital heart defects. ECMO, supported metabolically by parenteral nutrition, provides reductions in myocardial work and energy demand and therefore enhances functional recovery. The RV must often assume systemic ventricular pressures and function upon weaning from VA-ECMO. However the substrate utilization responses of the RV to VA-ECMO or stimulation are unknown...
February 3, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28122259/application-of-13-c-flux-analysis-to-identify-high-productivity-cho-metabolic-phenotypes
#19
Neil Templeton, Kevin D Smith, Allison G McAtee-Pereira, Haimanti Dorai, Michael J Betenbaugh, Steven E Lang, Jamey D Young
Industrial bioprocesses place high demands on the energy metabolism of host cells to meet biosynthetic requirements for maximal protein expression. Identifying metabolic phenotypes that promote high expression is therefore a major goal of the biotech industry. We conducted a series of (13)C flux analysis studies to examine the metabolic response to IgG expression during early stationary phase of CHO cell cultures grown in 3L fed-batch bioreactors. We examined eight clones expressing four different IgGs and compared with three non-expressing host-cell controls...
January 23, 2017: Metabolic Engineering
https://www.readbyqxmd.com/read/28119059/chronic-fluoxetine-treatment-directs-energy-metabolism-towards-the-citric-acid-cycle-and-oxidative-phosphorylation-in-rat-hippocampal-nonsynaptic-mitochondria
#20
Dragana Filipović, Victor Costina, Ivana Perić, Andrijana Stanisavljević, Peter Findeisen
Fluoxetine (Flx) is the principal treatment for depression; however, the precise mechanisms of its actions remain elusive. Our aim was to identify protein expression changes within rat hippocampus regulated by chronic Flx treatment versus vehicle-controls using proteomics. Fluoxetine-hydrohloride (15 mg/kg) was administered daily to adult male Wistar rats for 3 weeks, and cytosolic and nonsynaptic mitochondrial hippocampal proteomes were analyzed. All differentially expressed proteins were functionally annotated according to biological process and molecular function using Uniprot and Blast2GO...
January 21, 2017: Brain Research
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