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https://www.readbyqxmd.com/read/29128863/persistent-long-term-structural-functional-and-metabolic-changes-after-stress-induced-takotsubo-cardiomyopathy
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
https://www.readbyqxmd.com/read/29030453/gaba-alterations-in-pediatric-sport-concussion
#8
Seth D Friedman, Andrew V Poliakov, Christopher Budech, Dennis W W Shaw, David Breiger, Thomas Jinguji, Brian Krabak, David Coppel, Tressa Mattioli Lewis, Samuel Browd, Jeffrey G Ojemann
OBJECTIVE: To evaluate whether frontal-lobe magnetic resonance spectroscopy measures of γ-aminobutyric acid (GABA) would be altered in a sample of adolescents scanned after sport concussion because mild traumatic brain injury is often associated with working memory problems. METHODS: Eleven adolescents (age 14-17 years) who had sustained a first-time sport concussion were studied with MRI/magnetic resonance spectroscopy within 23 to 44 days after injury (mean 30...
October 13, 2017: Neurology
https://www.readbyqxmd.com/read/29024930/effect-of-concurrent-src-kinase-inhibition-with-short-duration-hypothermia-on-ca2-calmodulin-kinase-iv-activity-and-neuropathology-after-hypoxia-ischemia-in-the-newborn-swine-brain
#9
Panagiotis Kratimenos, Ioannis Koutroulis, Amit Jain, Shadi Malaeb, Maria Delivoria-Papadopoulos
BACKGROUND: Hypoxia-ischemia (HI) results in increased activation of Ca2+/calmodulin kinase IV (CaM kinase IV) mediated by Src kinase. Therapeutic hypothermia ameliorates neuronal injury in the newborn. HYPOTHESIS: Inhibition of Src kinase concurrently with hypothermia further attenuates the hypoxia-induced increased activation of CaM kinase IV compared with hypothermia alone. DESIGN/METHODS: Ventilated piglets were exposed to HI, received saline or a selective Src kinase inhibitor (PP2), and were cooled to 33°C...
October 13, 2017: Neonatology
https://www.readbyqxmd.com/read/28988824/citrobacter-rodentium-subverts-atp-flux-and-cholesterol-homeostasis-in-intestinal-epithelial-cells-in%C3%A2-vivo
#10
Cedric N Berger, Valerie F Crepin, Theodoros I Roumeliotis, James C Wright, Danielle Carson, Meirav Pevsner-Fischer, R Christopher D Furniss, Gordon Dougan, Mally Dori-Bachash, Lu Yu, Abigail Clements, James W Collins, Eran Elinav, Gerald J Larrouy-Maumus, Jyoti S Choudhary, Gad Frankel
The intestinal epithelial cells (IECs) that line the gut form a robust line of defense against ingested pathogens. We investigated the impact of infection with the enteric pathogen Citrobacter rodentium on mouse IEC metabolism using global proteomic and targeted metabolomics and lipidomics. The major signatures of the infection were upregulation of the sugar transporter Sglt4, aerobic glycolysis, and production of phosphocreatine, which mobilizes cytosolic energy. In contrast, biogenesis of mitochondrial cardiolipins, essential for ATP production, was inhibited, which coincided with increased levels of mucosal O2 and a reduction in colon-associated anaerobic commensals...
November 7, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28981141/brain-and-heart-magnetic-resonance-imaging-spectroscopy-in-duchenne-muscular-dystrophy
#11
REVIEW
Sophie Mavrogeni, Roser Pons, Ioannis Nikas, George Papadopoulos, Dimitrios A Verganelakis, Genovefa Kolovou, George P Chrousos
Duchenne muscular dystrophy (DMD) is an X-linked muscle disorder characterized by progressive and irreversible loss of muscular function. As muscular disease progresses, the repair mechanisms cannot compensate for cellular damage, leading inevitably to necrosis and progressive replacement by fibrous and fatty tissue. Cardiomyopathy and respiratory failure are the main causes of death in DMD. In addition to the well-described muscle and heart disease, cognitive dysfunction affects around 30% of DMD boys. Myocardial fibrosis, assessed by late gadolinium enhancement (LGE), using cardiovascular magnetic resonance imaging (CMR), is an early marker of heart involvement in both DMD patients and female carriers...
October 5, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28961344/investigation-of-the-contribution-of-total-creatine-to-the-cest-z-spectrum-of-brain-using-a-knockout-mouse-model
#12
Lin Chen, Haifeng Zeng, Xiang Xu, Nirbhay N Yadav, Shuhui Cai, Nicolaas A Puts, Peter B Barker, Tong Li, Robert G Weiss, Peter C M van Zijl, Jiadi Xu
The current study aims to assign and estimate the total creatine (tCr) signal contribution to the Z-spectrum in mouse brain at 11.7 T. Creatine (Cr), phosphocreatine (PCr) and protein phantoms were used to confirm the presence of a guanidinium resonance at this field strength. Wild-type (WT) and knockout mice with guanidinoacetate N-methyltransferase deficiency (GAMT-/-), which have low Cr and PCr concentrations in the brain, were used to assign the tCr contribution to the Z-spectrum. To estimate the total guanidinium concentrations, two pools for the Z-spectrum around 2 ppm were assumed: (i) a Lorentzian function representing the guanidinium chemical exchange saturation transfer (CEST) at 1...
December 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28955291/assessing-metabolism-and-injury-in-acute-human-traumatic-brain-injury-with-magnetic-resonance-spectroscopy-current-and-future-applications
#13
REVIEW
Matthew G Stovell, Jiun-Lin Yan, Alison Sleigh, Marius O Mada, T Adrian Carpenter, Peter J A Hutchinson, Keri L H Carpenter
Traumatic brain injury (TBI) triggers a series of complex pathophysiological processes. These include abnormalities in brain energy metabolism; consequent to reduced tissue pO2 arising from ischemia or abnormal tissue oxygen diffusion, or due to a failure of mitochondrial function. In vivo magnetic resonance spectroscopy (MRS) allows non-invasive interrogation of brain tissue metabolism in patients with acute brain injury. Nuclei with "spin," e.g., (1)H, (31)P, and (13)C, are detectable using MRS and are found in metabolites at various stages of energy metabolism, possessing unique signatures due to their chemical shift or spin-spin interactions (J-coupling)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28943100/validation-of-a-pharmacological-model-for-mitochondrial-dysfunction-in-healthy-subjects-using-simvastatin-a-randomized-placebo-controlled-proof-of-pharmacology-study
#14
Marcus P J van Diemen, Cécile L Berends, Naila Akram, Joep Wezel, Wouter M Teeuwisse, Bert G Mik, Hermien E Kan, Andrew Webb, Jan Willem M Beenakker, Geert Jan Groeneveld
Proof-of-pharmacology models to study compounds in healthy subjects offer multiple advantages. Simvastatin is known to induce mitochondrial dysfunction at least partly by depletion of co-enzyme Q10. The goal of this study was to evaluate a model of simvastatin-induced mitochondrial dysfunction in healthy subjects and to determine whether mitochondrial dysfunction could be pharmacologically reversed by treatment with co-enzyme Q10 (ubiquinol). Subjects received simvastatin 40mg/day for 8 weeks. After 4 weeks, subjects were randomized to receive ubiquinol 300mg/day or placebo in a double-blinded fashion...
November 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28942218/characterization-of-metabolic-diffusion-and-perfusion-properties-in-gbm-contrast-enhancing-versus-non-enhancing-tumor
#15
Adam Autry, Joanna J Phillips, Stojan Maleschlijski, Ritu Roy, Annette M Molinaro, Susan M Chang, Soonmee Cha, Janine M Lupo, Sarah J Nelson
BACKGROUND: Although the contrast-enhancing (CE) lesion on T1-weighted MR images is widely used as a surrogate for glioblastoma (GBM), there are also non-enhancing regions of infiltrative tumor within the T2-weighted lesion, which elude radiologic detection. Because non-enhancing GBM (Enh-) challenges clinical patient management as latent disease, this study sought to characterize ex vivo metabolic profiles from Enh- and CE GBM (Enh+) samples, alongside histological and in vivo MR parameters, to assist in defining criteria for estimating total tumor burden...
December 2017: Translational Oncology
https://www.readbyqxmd.com/read/28941767/a-proton-mr-spectroscopy-study-of-the-thalamus-in-twins-with-autism-spectrum-disorder
#16
John P Hegarty, Meng Gu, Daniel M Spielman, Sue C Cleveland, Joachim F Hallmayer, Laura C Lazzeroni, Mira M Raman, Thomas W Frazier, Jennifer M Phillips, Allan L Reiss, Antonio Y Hardan
Multiple lines of research have reported thalamic abnormalities in individuals with autism spectrum disorder (ASD) that are associated with social communication impairments (SCI), restricted and repetitive behaviors (RRB), or sensory processing abnormalities (SPA). Thus, the thalamus may represent a common neurobiological structure that is shared across symptom domains in ASD. Same-sex monozygotic (MZ) and dizygotic (DZ) twin pairs with and without ASD underwent cognitive/behavioral evaluation and magnetic resonance imaging to assess the thalamus...
September 21, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28932500/effects-of-low-load-resistance-exercise-with-blood-flow-restriction-on-high-energy-phosphate-metabolism-and-oxygenation-level-in-skeletal-muscle
#17
Osamu Yanagisawa, Manabu Sanomura
We aimed to evaluate the effects of low-load resistance exercise with blood flow restriction (BFR) on high-energy phosphate metabolism, intracellular pH, and oxygenation level in the skeletal muscle. Seven males performed low-load ankle plantar flexion exercise (120 repetitions, 30% of one-repetition maximum) with and without BFR (130% of systolic blood pressure) inside a magnetic resonance device. Inorganic phosphate (Pi)-to-phosphocreatine (PCr) ratio, intracellular pH, and tissue oxygenation index (TOI) in the medial gastrocnemius were determined using (31)P-magnetic resonance spectroscopy and near-infrared spectroscopy before and during exercise...
June 2017: Interventional Medicine & Applied Science
https://www.readbyqxmd.com/read/28916380/roles-of-amino-acid-residues-h66-and-d326-in-the-creatine-kinase-activity-and-structural-stability
#18
Qing-Yun Wu, Fang Wei, Yuan-Yuan Zhu, Yu-Xue Tong, Jiang Cao, Ping Zhou, Zhen-Yu Li, Ling-Yu Zeng, Feng Li, Xiao-Yun Wang, Kai-Lin Xu
Creatine kinase (CK) is a key enzyme for cellular energy metabolism, catalyzing the reversible phosphoryl transfer from phosphocreatine to ADP in vertebrates. CK contains a pair of highly conserved amino acids (H66 and D326) which might play an important role in sustaining the compact structure of CK by linking its N- and C- terminal domains; however the mechanism is still unclear. In this study, spectroscopic, structural modeling and protein folding experiments suggested that D326A, H66P and H66P/D326A mutations led to disruption of the hydrogen bond between those two amino acid residues and form the partially unfolded state which made it easier to be inactivated and unfolded under environmental stresses, and more prone to form insoluble aggregates...
September 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28915341/-31-p-magnetic-resonance-fingerprinting-for-rapid-quantification-of-creatine-kinase-reaction-rate-in-vivo
#19
Charlie Y Wang, Yuchi Liu, Shuying Huang, Mark A Griswold, Nicole Seiberlich, Xin Yu
The purpose of this work was to develop a (31) P spectroscopic magnetic resonance fingerprinting (MRF) method for fast quantification of the chemical exchange rate between phosphocreatine (PCr) and adenosine triphosphate (ATP) via creatine kinase (CK). A (31) P MRF sequence (CK-MRF) was developed to quantify the forward rate constant of ATP synthesis via CK ( kfCK), the T1 relaxation time of PCr ( T1PCr), and the PCr-to-ATP concentration ratio ( MRPCr). The CK-MRF sequence used a balanced steady-state free precession (bSSFP)-type excitation with ramped flip angles and a unique saturation scheme sensitive to the exchange between PCr and γATP...
December 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28915314/-1-h-mrs-processing-parameters-affect-metabolite-quantification-the-urgent-need-for-uniform-and-transparent-standardization
#20
Alex A Bhogal, Remmelt R Schür, Lotte C Houtepen, Bart van de Bank, Vincent O Boer, Anouk Marsman, Peter B Barker, Tom W J Scheenen, Jannie P Wijnen, Christiaan H Vinkers, Dennis W J Klomp
Proton magnetic resonance spectroscopy ((1) H-MRS) can be used to quantify in vivo metabolite levels, such as lactate, γ-aminobutyric acid (GABA) and glutamate (Glu). However, there are considerable analysis choices which can alter the accuracy or precision of (1) H-MRS metabolite quantification. It is currently unknown to what extent variations in the analysis pipeline used to quantify (1) H-MRS data affect outcomes. The purpose of this study was to evaluate whether the quantification of identical (1) H-MRS scans across independent and experienced research groups would yield comparable results...
September 15, 2017: NMR in Biomedicine
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