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Phosphocreatine

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https://www.readbyqxmd.com/read/28527566/abnormalities-in-high-energy-phosphate-metabolism-in-first-episode-bipolar-disorder-measured-using-31-p-magnetic-resonance-spectroscopy
#1
Fei Du, Cagri Yuksel, Virginie-Anne Chouinard, Polly Huynh, Kyle Ryan, Bruce M Cohen, Dost Öngür
BACKGROUND: Brain energy metabolism is critical for supporting synaptic function and information processing. A growing body of evidence suggests abnormalities in brain bioenergetics in psychiatric disorders, including both bipolar disorder (BD) and schizophrenia. (31)P magnetic resonance spectroscopy provides a noninvasive window into these processes in vivo. Using this approach, we previously showed that patients with BD show normal adenosine triphosphate (ATP) and phosphocreatine levels at rest but cannot maintain normal ATP levels in the visual cortex during times of high energy demand (photic stimulation)...
April 7, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28520446/-diabetic-foot-syndrome-importance-of-calf-muscles-mr-spectroscopy-in-the-assessment-of-limb-ischemia-and-effect-of-revascularization
#2
Andrea Němcová, Michal Dubský, Alexandra Jirkovská, Petr Šedivý, Miloslav Drobný, Milan Hájek, Monika Dezortová, Robert Bém, Vladimíra Fejfarová, Anna Pyšná
AIM: The standard method for assessment of effect of revascularization in patients with diabetic foot (DF) and critical limb ischemia (CLI) is transcutaneous oxygen pressure (TcPO2). Phosphorus magnetic resonance spectroscopy (31P MRS) enables to evaluate oxidative muscle metabolism that could be impaired in patients with diabetes and its complications. The aim of our study was to compare MRS of calf muscle between patients with DF and CLI and healthy controls and to evaluate the contribution of MRS in the assessment of the effect of revascularization...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/28509906/therapeutic-efficacy-of-atypical-antipsychotic-drugs-by-targeting-multiple-stress-related-metabolic-pathways
#3
H L Cai, P Jiang, Q Y Tan, R L Dang, M M Tang, Y Xue, Y Deng, B K Zhang, P F Fang, P Xu, D X Xiang, H D Li, J K Yao
Schizophrenia (SZ) is considered to be a multifactorial brain disorder with defects involving many biochemical pathways. Patients with SZ show variable responses to current pharmacological treatments of SZ because of the heterogeneity of this disorder. Stress has a significant role in the pathophysiological pathways and therapeutic responses of SZ. Atypical antipsychotic drugs (AAPDs) can modulate the stress response of the hypothalamic-pituitary-adrenal (HPA) axis and exert therapeutic effects on stress by targeting the prefrontal cortex (PFC) and hippocampus...
May 16, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28480619/rapid-and-simultaneous-measurement-of-phosphorus-metabolite-pool-size-ratio-and-reaction-kinetics-of-enzymes-in-vivo
#4
Sang-Young Kim, Wei Chen, Dost Ongur, Fei Du
PURPOSE: The metabolites phosphocreatine (PCr), adenosine triphosphate (ATP), and in-organic phosphate (Pi) are biochemically coupled. Their pool sizes, assessed by their magnetization ratios, have been extensively studied and reflect bioenergetics status in vivo. However, most such studies have ignored chemical exchange and T1 relaxation effects. In this work, we aimed to extend the T1nom method to simultaneously quantify the reaction rate constants as well as phosphorus metabolite pool size ratios under partially relaxed conditions...
May 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28476320/region-specific-aging-of-the-human-brain-as-evidenced-by-neurochemical-profiles-measured-noninvasively-in-the-posterior-cingulate-cortex-and-the-occipital-lobe-using-1-h-magnetic-resonance-spectroscopy-at-7-t
#5
Małgorzata Marjańska, J Riley McCarten, James Hodges, Laura S Hemmy, Andrea Grant, Dinesh K Deelchand, Melissa Terpstra
The concentrations of fourteen neurochemicals associated with metabolism, neurotransmission, antioxidant capacity, and cellular structure were measured noninvasively from two distinct brain regions using (1)H magnetic resonance spectroscopy. Seventeen young adults (age 19-22years) and sixteen cognitively normal older adults (age 70-88years) were scanned. To increase sensitivity and specificity, (1)H magnetic resonance spectra were obtained at the ultra-high field of 7T and at ultra-short echo time. The concentrations of neurochemicals were determined using water as an internal reference and accounting for gray matter, white matter, and cerebrospinal fluid content of the volume of interest...
May 3, 2017: Neuroscience
https://www.readbyqxmd.com/read/28475656/nmr-based-metabolomic-analysis-for-the-effects-of-creatine-supplementation-on-mouse-myoblast-cell-line-c2c12
#6
Wenqi Xu, Donghai Lin, Caihua Huang
Creatine (Cr) supplementation has drawn much attention from researchers owing to its widespread efficacy in sports, and more recently, in therapeutic fields. However, the underlying molecular mechanisms remain elusive. Here, we performed nuclear magnetic resonance-based metabolomic analysis to address the metabolic profile of aqueous extracts from the mouse myoblast cell line C2C12 exposed to 2 mM Cr for 24 h (the Cr-treated group). Results showed that Cr supplementation facilitated the proliferation of C2C12 myoblasts...
May 5, 2017: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/28473616/mini-review-on-cardiac-metabolic-imaging-current-imaging-modalities-and-future-perspectives
#7
Tineke van de Weijer, Elisabeth Helena Maria Paiman, Hildo J Lamb
In this review, current imaging techniques and their future perspectives in the field of cardiac metabolic imaging in humans are discussed. This includes a range of non-invasive imaging techniques allowing a detailed investigation of cardiac metabolism in health and disease. The main imaging modalities discussed are Magnetic Resonance Spectroscopy (MRS) techniques for determination of metabolite content (triglycerides, glucose, ATP, phosphocreatine and so on), MRI (for myocardial perfusion) Single Photon Emession Computed Tomography (SPECT) and Positron Emission Tomography (PET) for quantitation of perfusion and substrate uptake...
May 4, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28467982/adenosine-triphosphate-metabolism-measured-by-phosphorus-magnetic-resonance-spectroscopy-a-potential-biomarker-for-multiple-sclerosis-severity
#8
Paul Kauv, Samar S Ayache, Alain Créange, Moussa A Chalah, Jean-Pascal Lefaucheur, Jérôme Hodel, Pierre Brugières
BACKGROUND/AIMS: Phosphorus magnetic resonance spectroscopy (31P-MRS) has previously shown abnormal changes in energy metabolites in the brain of multiple sclerosis (MS) patients. However, the relationship between these energy metabolites - particularly adenosine triphosphate (ATP) - and the disease severity remains unclear. The objective of this study was to determine whether measuring ATP metabolites can help to predict disease severity in MS patients. METHODS: 31P-MRS at 3 tesla was performed in 9 relapsing remitting (RRMS), 9 secondary progressive MS patients (SPMS), and 10 age-matched healthy controls...
May 4, 2017: European Neurology
https://www.readbyqxmd.com/read/28453450/muscle-function-and-size-in-the-lumbar-spine-before-and-after-a-four-week-exercise-intervention
#9
Jonathan Fulford, Vladimira Juroskova, Judith R Meakin, Alan R Barker
BACKGROUND: Exercise of the spinal muscles is recommended for a variety of rehabilitative reasons but it is not always clear whether interventions are effective in improving the performance of the muscles or whether their benefit is elicited via other mechanisms. OBJECTIVE: To explore the effects of an exercise intervention on the size and exercise performance of the lumbar spine extensor muscles. METHODS: Eleven healthy participants undertook a four week programme of exercise...
April 14, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28450006/metabolic-profiles-from-two-different-breakfast-meals-characterized-by-1-h-nmr-based-metabolomics
#10
Millie Rådjursöga, Göran B Karlsson, Helen M Lindqvist, Anders Pedersen, Cecilia Persson, Rui Climaco Pinto, Lars Ellegård, Anna Winkvist
It is challenging to measure dietary exposure with techniques that are both accurate and applicable to free-living individuals. We performed a cross-over intervention, with 24 healthy individuals, to capture the acute metabolic response of a cereal breakfast (CB) and an egg and ham breakfast (EHB). Fasting and postprandial urine samples were analyzed using (1)H nuclear magnetic resonance (NMR) spectroscopy and multivariate data analysis. Metabolic profiles were distinguished in relation to ingestion of either CB or EHB...
September 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28420309/a-proton-magnetic-resonance-spectroscopic-study-in-autism-spectrum-disorder-using-a-3-tesla-clinical-magnetic-resonance-imaging-mri-system-the-anterior-cingulate-cortex-and-the-left-cerebellum
#11
Hiromichi Ito, Kenji Mori, Masafumi Harada, Sonoka Hisaoka, Yoshihiro Toda, Tatsuo Mori, Aya Goji, Yoko Abe, Masahito Miyazaki, Shoji Kagami
The pathophysiology of autism spectrum disorder (ASD) is not fully understood. We used proton magnetic resonance spectroscopy to investigate metabolite concentration ratios in the anterior cingulate cortex and left cerebellum in ASD. In the ACC and left cerebellum studies, the ASD group and intelligence quotient- and age-matched control group consisted of 112 and 114 subjects and 65 and 45 subjects, respectively. In the ASD group, γ-aminobutyric acid (GABA)+/ creatine/phosphocreatine (Cr) was significantly decreased in the anterior cingulate cortex, and glutamate (Glu)/Cr was significantly increased and GABA+/Cr was significantly decreased in the left cerebellum compared to those in the control group...
January 1, 2017: Journal of Child Neurology
https://www.readbyqxmd.com/read/28397310/creatine-supplementation-reduces-sleep-need-and-homeostatic-sleep-pressure-in-rats
#12
Markus Dworak, Tae Kim, Robert W Mccarley, Radhika Basheer
Sleep has been postulated to promote brain energy restoration. It is as yet unknown if increasing the energy availability within the brain reduces sleep need. The guanidine amino acid creatine (Cr) is a well-known energy booster in cellular energy homeostasis. Oral Cr-monohydrate supplementation (CS) increases exercise performance and has been shown to have substantial effects on cognitive performance, neuroprotection and circadian rhythms. The effect of CS on cellular high-energy molecules and sleep-wake behaviour is unclear...
June 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28394203/dysregulation-of-energy-metabolism-in-multiple-sclerosis-measured-in-vivo-with-diffusion-weighted-spectroscopy
#13
Benedetta Bodini, Francesca Branzoli, Emilie Poirion, Daniel García-Lorenzo, Mélanie Didier, Elisabeth Maillart, Julie Socha, Geraldine Bera, Catherine Lubetzki, Itamar Ronen, Stephane Lehericy, Bruno Stankoff
OBJECTIVE: We employed diffusion-weighted magnetic resonance spectroscopy (DW-MRS), which allows to measure in vivo the diffusion properties of metabolites, to explore the functional neuro-axonal damage and the ongoing energetic dysregulation in multiple sclerosis (MS). METHODS: Twenty-five patients with MS and 18 healthy controls (HC) underwent conventional magnetic resonance imaging (MRI) and DW-MRS. The apparent diffusion coefficient (ADC) of total N-acetyl-aspartate (tNAA) and creatine-phosphocreatine (tCr) were measured in the parietal normal-appearing white matter (NAWM) and in the thalamic grey matter (TGM)...
April 1, 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/28392373/persistent-blood-glucose-reduction-upon-repeated-transcranial-electric-stimulation-in-men
#14
Alina Kistenmacher, Sebastian Manneck, Ewelina K Wardzinski, Jan C Martens, Georg Gohla, Uwe H Melchert, Kamila Jauch-Chara, Kerstin M Oltmanns
BACKGROUND: Transcranial direct current stimulation (tDCS) of the human brain increases systemic glucose tolerance. OBJECTIVE/HYPOTHESIS: To investigate whether this effect persists after one week of repeated stimulation. Because systemic glucose uptake relates to brain energy homeostasis, we concomitantly measured cerebral high-energy phosphate metabolites. METHODS: In a sham-controlled crossover design, 14 healthy men were tested under daily anodal tDCS vs...
March 25, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28350397/diagnosis-and-body-mass-index-effects-on-hippocampal-volumes-and-neurochemistry-in-bipolar-disorder
#15
D J Bond, L E Silveira, E L MacMillan, I J Torres, D J Lang, W Su, W G Honer, R W Lam, L N Yatham
We previously reported that higher body mass index (BMI) was associated with greater hippocampal glutamate+glutamine in people with bipolar disorder (BD), but not in non-BD healthy comparator subjects (HSs). In the current report, we extend these findings by examining the impact of BD diagnosis and BMI on hippocampal volumes and the concentrations of several additional neurochemicals in 57 early-stage BD patients and 31 HSs. Using 3-T magnetic resonance imaging and magnetic resonance spectroscopy, we measured bilateral hippocampal volumes and the hippocampal concentrations of four neurochemicals relevant to BD: N-acetylaspartate+N-acteylaspartylglutamate (tNAA), creatine+phosphocreatine (Cre), myoinositol (Ins) and glycerophosphocholine+phosphatidylcholine (Cho)...
March 28, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28345160/increasing-skeletal-muscle-carnitine-availability-does-not-alter-the-adaptations-to-high-intensity-interval-training
#16
Christopher E Shannon, Reza Ghasemi, Paul L Greenhaff, Francis B Stephens
Increasing skeletal muscle carnitine availability alters muscle metabolism during steady-state exercise in healthy humans. We investigated whether elevating muscle carnitine, and thereby the acetyl-group buffering capacity, altered the metabolic and physiological adaptations to 24 weeks of high-intensity interval training (HIIT) at 100% maximal exercise capacity (Wattmax ). Twenty-one healthy male volunteers (age 23±2 years; BMI 24.2±1.1 kg/m(2) ) performed 2x3 minute bouts of cycling exercise at 100% Wattmax , separated by five minutes rest...
March 27, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28332113/the-critical-power-concept-applications-to-sports-performance-with-a-focus-on-intermittent-high-intensity-exercise
#17
REVIEW
Andrew M Jones, Anni Vanhatalo
The curvilinear relationship between power output and the time for which it can be sustained is a fundamental and well-known feature of high-intensity exercise performance. This relationship 'levels off' at a 'critical power' (CP) that separates power outputs that can be sustained with stable values of, for example, muscle phosphocreatine, blood lactate, and pulmonary oxygen uptake ([Formula: see text]), from power outputs where these variables change continuously with time until their respective minimum and maximum values are reached and exercise intolerance occurs...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28332112/perspectives-on-exertional-rhabdomyolysis
#18
REVIEW
Eric S Rawson, Priscilla M Clarkson, Mark A Tarnopolsky
Exertional (exercise-induced) rhabdomyolysis is a potentially life threatening condition that has been the subject of research, intense discussion, and media attention. The causes of rhabdomyolysis are numerous and can include direct muscle injury, unaccustomed exercise, ischemia, extreme temperatures, electrolyte abnormalities, endocrinologic conditions, genetic disorders, autoimmune disorders, infections, drugs, toxins, and venoms. The objective of this article is to review the literature on exertional rhabdomyolysis, identify precipitating factors, and examine the role of the dietary supplement creatine monohydrate...
March 2017: Sports Medicine
https://www.readbyqxmd.com/read/28303591/-31-p-magnetization-transfer-magnetic-resonance-spectroscopy-assessing-the-activation-induced-change-in-cerebral-atp-metabolic-rates-at-3-t
#19
Chen Chen, Mary C Stephenson, Andrew Peters, Peter G Morris, Susan T Francis, Penny A Gowland
PURPOSE: In vivo (31) P magnetic resonance spectroscopy (MRS) magnetization transfer (MT) provides a direct measure of neuronal activity at the metabolic level. This work aims to use functional (31) P MRS-MT to investigate the change in cerebral adenosine triphosphate (ATP) metabolic rates in healthy adults upon repeated visual stimuli. METHODS: A magnetization saturation transfer sequence with narrowband selective saturation of γ-ATP was developed for (31) P MT experiments at 3 T...
March 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28292879/%C3%AE-gpa-treatment-leads-to-elevated-basal-metabolic-rate-and-enhanced-hypoxic-exercise-tolerance-in-mice
#20
Trenton T Ross, Jeffrey D Overton, Katelyn F Houmard, Stephen T Kinsey
Treatments that increase basal metabolic rate (BMR) and enhance exercise capacity may be useful therapeutic approaches for treating conditions such as type 2 diabetes, obesity, and associated circulatory problems. β-guanidinopropionic acid (β-GPA) supplementation decreases high-energy phosphate concentrations, such as ATP and phosphocreatine (PCr) resulting in an energetic challenge that is similar to both exercise programs and hypoxic conditions. In this study, we administered β-GPA to mice for 2 or 6 weeks, and investigated the effect on muscle energetic status, body and muscle mass, muscle capillarity, BMR, and normoxic and hypoxic exercise tolerance (NET and HET, respectively)...
March 2017: Physiological Reports
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