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https://www.readbyqxmd.com/read/29335880/the-long-term-effect-of-erythropoiesis-stimulating-agents-given-to-preterm-infants-a-proton-magnetic-resonance-spectroscopy-study-on-neurometabolites-in-early-childhood
#1
Charles Gasparovic, Arvind Caprihan, Ronald A Yeo, John Phillips, Jean R Lowe, Richard Campbell, Robin K Ohls
BACKGROUND: Erythropoiesis stimulating agents (ESAs) are neuroprotective in cell and animal models of preterm birth. Prematurity has been shown to alter neurometabolite levels in children in studies using proton magnetic resonance spectroscopy (1H-MRS). OBJECTIVE: We hypothesized that ESA treatment in premature infants would tend to normalize neurometabolites by 4-6 years of age. MATERIALS AND METHODS: Children in a longitudinal study of neurodevelopment underwent MRI and 1H-MRS at approximately 4 years and 6 years of age...
January 15, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29311764/effects-of-beetroot-juice-supplementation-on-intermittent-high-intensity-exercise-efforts
#2
REVIEW
Raúl Domínguez, José Luis Maté-Muñoz, Eduardo Cuenca, Pablo García-Fernández, Fernando Mata-Ordoñez, María Carmen Lozano-Estevan, Pablo Veiga-Herreros, Sandro Fernandes da Silva, Manuel Vicente Garnacho-Castaño
Beetroot juice contains high levels of inorganic nitrate (NO3-) and its intake has proved effective at increasing blood nitric oxide (NO) concentrations. Given the effects of NO in promoting vasodilation and blood flow with beneficial impacts on muscle contraction, several studies have detected an ergogenic effect of beetroot juice supplementation on exercise efforts with high oxidative energy metabolism demands. However, only a scarce yet growing number of investigations have sought to assess the effects of this supplement on performance at high-intensity exercise...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29289451/mitochondrial-dysfunction-in-myotonic-dystrophy-type-1
#3
Laura Ludovica Gramegna, Maria Pia Giannoccaro, David Neil Manners, Claudia Testa, Stefano Zanigni, Stefania Evangelisti, Claudio Bianchini, Federico Oppi, Roberto Poda, Patrizia Avoni, Raffaele Lodi, Rocco Liguori, Caterina Tonon
The pathophysiological mechanism linking the nucleotide expansion in the DMPK gene to the clinical manifestations of myotonic dystrophy type 1 (DM1) is still unclear. In vitro studies demonstrate DMPK involvement in the redox homeostasis of cells and the mitochondrial dysfunction in DM1, but in vivo investigations of oxidative metabolism in skeletal muscle have provided ambiguous results and have never been performed in the brain. Twenty-five DM1 patients (14M, 39 ± 11years) underwent brain proton MR spectroscopy (1H-MRS), and sixteen cases (9M, 40 ± 13 years old) also calf muscle phosphorus MRS (31P-MRS)...
November 14, 2017: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/29287112/mitochondrial-dna-depletion-by-ethidium-bromide-decreases-neuronal-mitochondrial-creatine-kinase-implications-for-striatal-energy-metabolism
#4
Emily Booth Warren, Aidan Edward Aicher, Joshua Patrick Fessel, Christine Konradi
Mitochondrial DNA (mtDNA), the discrete genome which encodes subunits of the mitochondrial respiratory chain, is present at highly variable copy numbers across cell types. Though severe mtDNA depletion dramatically reduces mitochondrial function, the impact of tissue-specific mtDNA reduction remains debated. Previously, our lab identified reduced mtDNA quantity in the putamen of Parkinson's Disease (PD) patients who had developed L-DOPA Induced Dyskinesia (LID), compared to PD patients who had not developed LID and healthy subjects...
2017: PloS One
https://www.readbyqxmd.com/read/29236952/impaired-cardiac-contractile-function-in-agat-knockout-mice-devoid-of-creatine-is-rescued-by-homoarginine-but-not-creatine
#5
Kiterie M E Faller, Dorothee Atzler, Debra J McAndrew, Sevasti Zervou, Hannah J Whittington, Jillian N Simon, Dunja Aksentijevic, Michiel Ten Hove, Chi-Un Choe, Dirk Isbrandt, Barbara Casadei, Jurgen E Schneider, Stefan Neubauer, Craig A Lygate
Aims: Creatine buffers cellular ATP via the creatine kinase reaction. Creatine levels are reduced in heart failure, but their contribution to pathophysiology is unclear. Arginine:glycine amidinotransferase (AGAT) in the kidney catalyses both the first step in creatine biosynthesis as well as homoarginine synthesis. AGAT-/- mice fed a creatine-free diet have a whole body creatine-deficiency. We hypothesised that AGAT-/- mice would develop cardiac dysfunction and rescue by dietary creatine would imply causality...
December 11, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/29230178/human-cardiac-31p-mr-spectroscopy-at-3-tesla-cannot-detect-failing-myocardial-energy-homeostasis-during-exercise
#6
Adrianus J Bakermans, Jason N Bazil, Aart J Nederveen, Gustav J Strijkers, S Matthijs Boekholdt, Daniel A Beard, Jeroen A L Jeneson
Phosphorus-31 magnetic resonance spectroscopy (31P-MRS) is a unique non-invasive imaging modality for probing in vivo high-energy phosphate metabolism in the human heart. We investigated whether current 31P-MRS methodology would allow for clinical applications to detect exercise-induced changes in (patho-)physiological myocardial energy metabolism. Hereto, measurement variability and repeatability of three commonly used localized 31P-MRS methods [3D image-selected in vivo spectroscopy (ISIS) and 1D ISIS with 1D chemical shift imaging (CSI) oriented either perpendicular or parallel to the surface coil] to quantify the myocardial phosphocreatine (PCr) to adenosine triphosphate (ATP) ratio in healthy humans (n = 8) at rest were determined on a clinical 3 Tesla MR system...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29209878/cell-type-specific-spatiotemporal-expression-of-creatine-biosynthetic-enzyme-s-adenosylmethionine-guanidinoacetate-n-methyltransferase-in-developing-mouse-brain
#7
Masanori Tachikawa, Masahiko Watanabe, Masahiro Fukaya, Kazuhisa Sakai, Tetsuya Terasaki, Ken-Ichi Hosoya
Creatine is synthesized by S-adenosylmethionine:guanidinoacetate N-methyltransferase (GAMT), and the creatine/phosphocreatine shuttle system mediated by creatine kinase (CK) is essential for storage and regeneration of high-energy phosphates in cells. Although the importance of this system in brain development is evidenced by the hereditary nature of creatine deficiency syndrome, the spatiotemporal cellular expression patterns of GAMT in developing brain remain unknown. Here we show that two waves of high GAMT expression occur in developing mouse brain...
December 5, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/29203059/increased-glutamate%C3%A2-glutamine-levels-in-the-thalamus-of-patients-with-essential-tremor-a-preliminary-proton-mr-spectroscopic-study
#8
Gaetano Barbagallo, Gennarina Arabia, Fabiana Novellino, Rita Nisticò, Maria Salsone, Maurizio Morelli, Federico Rocca, Andrea Quattrone, Manuela Caracciolo, Umberto Sabatini, Andrea Cherubini, Aldo Quattrone
INTRODUCTION: The aim of this study was to investigate the thalamic biochemical profile in patients with essential tremor (ET), using proton magnetic resonance spectroscopy (1H-MRS), and to explore the correlations between clinical and biochemical data. METHODS: Sixteen patients with ET and 14 healthy controls participated in this study. After conventional MR imaging, single-voxel 1H-MRS (TR = 2000 ms; TE = 28 ms) was performed by using a PROBE-SV system implemented on a 3-T scanner...
November 28, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29197997/class-effects-of-sglt2-inhibitors-in-mouse-cardiomyocytes-and-hearts-inhibition-of-na-h-exchanger-lowering-of-cytosolic-na-and-vasodilation
#9
Laween Uthman, Antonius Baartscheer, Boris Bleijlevens, Cees A Schumacher, Jan W T Fiolet, Anneke Koeman, Milena Jancev, Markus W Hollmann, Nina C Weber, Ruben Coronel, Coert J Zuurbier
AIMS/HYPOTHESIS: Sodium-glucose cotransporter 2 (SGLT2) inhibitors (SGLT2i) constitute a novel class of glucose-lowering (type 2) kidney-targeted agents. We recently reported that the SGLT2i empagliflozin (EMPA) reduced cardiac cytosolic Na+ ([Na+]c) and cytosolic Ca2+ ([Ca2+]c) concentrations through inhibition of Na+/H+ exchanger (NHE). Here, we examine (1) whether the SGLT2i dapagliflozin (DAPA) and canagliflozin (CANA) also inhibit NHE and reduce [Na+]c; (2) a structural model for the interaction of SGLT2i to NHE; (3) to what extent SGLT2i affect the haemodynamic and metabolic performance of isolated hearts of healthy mice...
December 2, 2017: Diabetologia
https://www.readbyqxmd.com/read/29192254/effect-of-src-kinase-inhibition-on-cytochrome-c-smac-diablo-and-apoptosis-inducing-factor-aif-following-cerebral-hypoxia-ischemia-in-newborn-piglets
#10
Panagiotis Kratimenos, Ioannis Koutroulis, Beamon Agarwal, Stamatios Theocharis, Maria Delivoria-Papadopoulos
We have previously shown that cerebral Hypoxia-ischemia (HI) results in activation of Src kinase in the newborn piglet brain. We investigated the regulatory mechanism by which the pre-apoptotic proteins translocate from mitochondria to the cytosol during HI through the Src kinase. Newborn piglets were divided into 3 groups (n = 5/group): normoxic (Nx), HI and HI pre-treated with Src kinase inhibitor PP2 (PP2 + HI). Brain tissue HI was verified by neuropathological analysis and by Adenosine Triphosphate (ATP) and Phosphocreatine (PCr) levels...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29175483/the-effects-of-dietary-%C3%AE-guanidinopropionic-acid-on-growth-and-muscle-fiber-development-in-juvenile-red-porgy-pagrus-pagrus
#11
Dalon P White, Bradley L Baumgarner, Wade O Watanabe, Md Shah Alam, Stephen T Kinsey
β-guanidinopropionic acid (β-GPA) has been used in mammalian models to reduce intracellular phosphocreatine (PCr) concentration, which in turn lowers the energetic state of cells. This leads to changes in signaling pathways that attempt to re-establish energetic homeostasis. Changes in those pathways elicit effects similar to those of exercise such as changes in body and muscle growth, metabolism, endurance and health. Generally, exercise effects are beneficial to fish health and aquaculture, but inducing exercise in fishes can be impractical...
November 22, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/29165089/a-novel-method-to-synthesize-phosphocreatine-and-phosphocreatine-prodrugs
#12
Maria Arkel, Patrizia Garbati, Annalisa Salis, Gianluca Damonte, Nara Liessi, Enrico Adriano, Umberto Benatti, Maurizio Balestrino, Enrico Millo
Background Adenosine triphosphate (ATP) is the energy currency of the body; it takes part in various and indispensable metabolic processes for the maintenance of cell homeostasis, degrading to its hydrolysis product, adenosine diphosphate (ADP). Efficient ways to restore ATP are therefore necessary in the cells. When the cell lacks energy due to ischemic conditions or high ATP demand, phosphocreatine gives its phosphate group to ADP that converts to ATP, in a reaction catalyzed by the enzyme creatine kinase...
November 20, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/29156374/genetic-profiling-and-surface-proteome-analysis-of-human-atrial-stromal-cells-and-rat-ventricular-epicardium-derived-cells-reveals-novel-insights-into-their-cardiogenic-potential
#13
Sebastian Temme, Daniela Friebe, Timo Schmidt, Gereon Poschmann, Julia Hesse, Bodo Steckel, Kai Stühler, Meik Kunz, Thomas Dandekar, Zhaoping Ding, Payam Akhyari, Artur Lichtenberg, Jürgen Schrader
Epicardium-derived cells (EPDC) and atrial stromal cells (ASC) display cardio-regenerative potential, but the molecular details are still unexplored. Signals which induce activation, migration and differentiation of these cells are largely unknown. Here we have isolated rat ventricular EPDC and rat/human ASC and performed genetic and proteomic profiling. EPDC and ASC expressed epicardial/mesenchymal markers (WT-1, Tbx18, CD73, CD90, CD44, CD105), cardiac markers (Gata4, Tbx5, troponin T) and also contained phosphocreatine...
November 7, 2017: Stem Cell Research
https://www.readbyqxmd.com/read/29128863/persistent-long-term-structural-functional-and-metabolic-changes-after-stress-induced-takotsubo-cardiomyopathy
#14
Caroline Scally, Amelia Rudd, Alice Mezincescu, Heather Wilson, Janaki Srinivasan, Graham Horgan, Paul Broadhurst, David E Newby, Anke Henning, Dana K Dawson
BACKGROUND : Takotsubo cardiomyopathy is an increasingly recognized acute heart failure syndrome precipitated by intense emotional stress. Although there is an apparent rapid and spontaneous recovery of left ventricular ejection fraction, the long-term clinical and functional consequences of takotsubo cardiomyopathy are ill-defined. METHODS : In an observational case-control study, we recruited 37 patients with prior (>12-month) takotsubo cardiomyopathy, and 37 age-, sex-, and comorbidity-matched control subjects...
November 11, 2017: Circulation
https://www.readbyqxmd.com/read/29120073/astrocytic-and-neuronal-oxidative-metabolism-are-coupled-to-the-rate-of-glutamate-glutamine-cycle-in-the-tree-shrew-visual-cortex
#15
Sarah Sonnay, Jordan Poirot, Nathalie Just, Anne-Catherine Clerc, Rolf Gruetter, Gregor Rainer, João M N Duarte
Astrocytes play an important role in glutamatergic neurotransmission, namely by clearing synaptic glutamate and converting it into glutamine that is transferred back to neurons. The rate of this glutamate-glutamine cycle (VNT ) has been proposed to couple to that of glucose utilization and of neuronal tricarboxylic acid (TCA) cycle. In this study, we tested the hypothesis that glutamatergic neurotransmission is also coupled to the TCA cycle rate in astrocytes. For that we investigated energy metabolism by means of magnetic resonance spectroscopy (MRS) in the primary visual cortex of tree shrews (Tupaia belangeri) under light isoflurane anesthesia at rest and during continuous visual stimulation...
November 9, 2017: Glia
https://www.readbyqxmd.com/read/29099292/cerebral-metabolism-and-vascular-reactivity-during-breath-hold-and-hypoxic-challenge-in-freedivers-and-healthy-controls
#16
Mark B Vestergaard, Henrik Bw Larsson
The goal of the present study was to examine the cerebral metabolism and vascular reactivity during extended breath-holds (ranging from 2 min 32 s to 7 min 0 s) and during a hypoxic challenge in freedivers and non-diver controls. Magnetic resonance imaging was used to measure the global cerebral blood flow (CBF) and metabolic rate of oxygen (CMRO2), and magnetic resonance spectroscopy was used to measure the cerebral lactate, glutamate+glutamine, N-acetylaspartate and phosphocreatine+creatine concentrations in the occipital lobe...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29073228/using-a-whole-body-31p-birdcage-transmit-coil-and-16-element-receive-array-for-human-cardiac-metabolic-imaging-at-7t
#17
Ladislav Valkovič, Iulius Dragonu, Salam Almujayyaz, Alex Batzakis, Liam A J Young, Lucian A B Purvis, William T Clarke, Tobias Wichmann, Titus Lanz, Stefan Neubauer, Matthew D Robson, Dennis W J Klomp, Christopher T Rodgers
PURPOSE: Cardiac phosphorus magnetic resonance spectroscopy (31P-MRS) provides unique insight into the mechanisms of heart failure. Yet, clinical applications have been hindered by the restricted sensitivity of the surface radiofrequency-coils normally used. These permit the analysis of spectra only from the interventricular septum, or large volumes of myocardium, which may not be meaningful in focal disease. Löring et al. recently presented a prototype whole-body (52 cm diameter) transmit/receive birdcage coil for 31P at 7T...
2017: PloS One
https://www.readbyqxmd.com/read/29069098/exploration-of-human-brain-tumour-metabolism-using-pairwise-metabolite-metabolite-correlation-analysis-mmca-of-hr-mas-1h-nmr-spectra
#18
Basetti Madhu, Alexandra Jauhiainen, Sean McGuire, John R Griffiths
METHODS: We quantified 378 HRMAS 1H NMR spectra of human brain tumours (132 glioblastomas, 101 astrocytomas, 75 meningiomas, 37 oligodendrogliomas and 33 metastases) from the eTumour database and looked for metabolic interactions by metabolite-metabolite correlation analysis (MMCA). RESULTS: All tumour types showed remarkably similar metabolic correlations. Lactate correlated positively with alanine, glutamate with glutamine; creatine + phosphocreatine (tCr) correlated positively with lactate, alanine and choline + phosphocholine + glycerophosphocholine (tCho), and tCho correlated positively with lactate; fatty acids correlated negatively with lactate, glutamate + glutamine (tGlut), tCr and tCho...
2017: PloS One
https://www.readbyqxmd.com/read/29065533/leucine-enriched-essential-amino-acids-augment-muscle-glycogen-content-in-rats-seven-days-after-eccentric-contraction
#19
Hiroyuki Kato, Kyoko Miura, Katsuya Suzuki, Makoto Bannai
Eccentric contractions induce muscle damage, which impairs recovery of glycogen and adenosine tri-phosphate (ATP) content over several days. Leucine-enriched essential amino acids (LEAAs) enhance the recovery in muscles that are damaged after eccentric contractions. However, the role of LEAAs in this process remains unclear. We evaluated the content in glycogen and high energy phosphates molecules (phosphocreatine (PCr), adenosine di-phosphate (ADP) and ATP) in rats that were following electrically stimulated eccentric contractions...
October 23, 2017: Nutrients
https://www.readbyqxmd.com/read/29038417/role-of-exogenous-phosphocreatine-in-chemotherapy-induced-cardiomyopathy
#20
Swapnil Parve, Gulnaz I Aliakberova, Albert A Gylmanov, Diana I Abdulganieva
The 5-fluorouracil, doxorubicin, and cyclophosphamide (FAC) regimen is widely used in the management of breast cancer. The common cardiotoxic effects of doxorubicin include congestive heart failure and left ventricular dysfunction, and those of cyclophosphamide include pericarditis, myocarditis, and congestive heart failure. It has been postulated that cardiotoxicity of 5-fluorouracil presents as coronary artery diseases (eg, angina). Cardiomyopathy is a common outcome following treatment with the FAC regimen...
2017: Reviews in Cardiovascular Medicine
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