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https://www.readbyqxmd.com/read/28820983/a-sensitive-method-for-the-separation-and-quantification-of-low-level-adenine-nucleotides-using-porous-graphitic-carbon-based-liquid-chromatography-and-tandem-mass-spectrometry
#1
Sonia Bustamante, Robert B Gilchrist, Dulama Richani
A liquid chromatography coupled to heated electrospray ionization/tandem mass spectrometry (LC-HESI-MS/MS) method was developed for the simultaneous quantitative analysis of low nanomolar level adenine nucleotides AMP, ADP, ATP, cyclic AMP (cAMP), and the nucleoside adenosine. For analyte retention and separation, reverse phase chromatography using porous graphitic carbon (PGC) was employed as it provided full resolution. The erratic chromatographic behaviour characteristic of PGC, including deterioration of analyte resolution and increased peak tailing (leading to decreased sensitivity), was mitigated by incorporating acidic equilibration within runs using a quaternary gradient...
July 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28793908/transcriptomic-analysis-comparing-mouse-strains-with-extreme-total-lung-capacities-identifies-novel-candidate-genes-for-pulmonary-function
#2
Leema George, Ankita Mitra, Tania A Thimraj, Martin Irmler, Sangeetha Vishweswaraiah, Lars Lunding, Dorothea Hühn, Alicia Madurga, Johannes Beckers, Heinz Fehrenbach, Swapna Upadhyay, Holger Schulz, George D Leikauf, Koustav Ganguly
BACKGROUND: Failure to attain peak lung function by early adulthood is a risk factor for chronic lung diseases. Previously, we reported that C3H/HeJ mice have about twice total lung capacity (TLC) compared to JF1/MsJ mice. We identified seven lung function quantitative trait loci (QTL: Lfnq1-Lfnq7) in backcross/intercross mice derived from these inbred strains. We further demonstrated, superoxide dismutase 3, extracellular (Sod3), Kit oncogene (Kit) and secreted phosphoprotein 1 (Spp1) located on these Lfnqs as lung function determinants...
August 9, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28780839/-feasibility-and-value-of-index-of-microcirculatory-resistance-in-patients-with-acute-myocardial-infarction-after-primary-percutaneous-coronary-intervention
#3
J L Han, L Y He, M Cui, Y Z Zhang, X B Liu, X Y Xu, Y P Wang, F F Wang, G S Wang, J Niu, F C Zhang, L Mi, L J Guo, W Gao
Objective: To evaluate the feasibility of detecting index of microcirculatory resistance (IMR) and the relationship between IMR and left ventricular (LV) systolic function after acute myocardial infarction (AMI) undergoing primary percutaneous coronary intervention (PCI). Methods: The patients with first AMI received primary PCI in Peking University Third Hospital were enrolled from January 2014 to March 2016. IMR were measured immediately after PCI by using pressure/temperature wire. The relationship between IMR and left ventricular ejection fraction (LVEF) assessed by echocardiography at first day and 6 months after admission was evaluated...
August 1, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28776675/dissociating-external-power-from-intramuscular-exercise-intensity-during-intermittent-bilateral-knee-extension-in-humans
#4
Matthew J Davies, Alan P Benson, Daniel T Cannon, Simon Marwood, Graham J Kemp, Harry B Rossiter, Carrie Ferguson
Compared with work-matched high-intensity continuous exercise, intermittent exercise dissociates pulmonary oxygen uptake (V̇O2 ) from the accumulated work. The extent to which this reflects differences in O2 storage fluctuations and/or contributions from oxidative and substrate-level bioenergetics is unknown. Using pulmonary gas-exchange and intramuscular (31) P magnetic resonance spectroscopy, we tested the hypotheses that at the same power: ATP synthesis rates are similar; but peak V̇O2 amplitude is lower in intermittent vs...
August 4, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28770830/resveratrol-alleviates-diabetic-cardiomyopathy-in-rats-by-improving-mitochondrial-function-through-pgc-1%C3%AE-deacetylation
#5
Wei-Jin Fang, Chun-Jiang Wang, Yang He, Yu-Lu Zhou, Xiang-Dong Peng, Shi-Kun Liu
Recent evidence shows that resveratrol (RSV) may ameliorate high-glucose-induced cardiac oxidative stress, mitochondrial dysfunction and myocardial fibrosis in diabetes. However, the mechanisms by which RSV regu¬lates mitochondrial function in diabetic cardiomyopathy have not been fully elucidated. Mitochondrial dysfunction contributes to cardiac dysfunction in diabetic patients, which is associated with dysregulation of peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α). In this study we examined whether resveratrol alleviated cardiac dysfunction in diabetes by improving mitochondrial function via SIRT1-mediated PGC-1α deacetylation...
August 3, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/28732888/separation-of-polysaccharides-from-spirulina-platensis-by-hsccc-with-ethanol-ammonium-sulfate-atps-and-their-antioxidant-activities
#6
Xueyan Wu, Ruichang Li, Yongjie Zhao, Yang Liu
Three separation methods for water-soluble polysaccharides from Spirulina platensis (PSP) were compared, including sevage deproteinization and column chromatography, ethanol-ammonium sulfate aqueous two-phase system (ATPS) and column chromatography, and one-step high speed counter-current chromatography (HSCCC) with ethanol-ammonium sulfate ATPS. ATPS was confirmed as an efficient alternative method of protein removal for PSP purification. For the HSCCC with ethanol-ammonium sulfate ATPS, the stationary retention reached to 50...
October 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28715120/characterization-of-a-multiple-particle-delivery-complex-and-determination-of-cellular-photodamage-in-skin-fibroblast-and-breast-cancer-cell-lines
#7
Ivan Mfouo-Tynga, Nicolette Nadene Houreld, Heidi Abrahamse
Zinc metallized Phthalocyanine (ZnPcSmix ), a potent photosensitizer (PS), is conjugated to gold dendrimer encapsulated nanoparticles (AuDENPs) in order to improve the efficacy of Photodynamic therapy (PDT) using MCF-7 breast cancer cells and WS1 fibroblast cells as a control. Both ZnPcSmix and AuDENPs are mixed in a nitrogen atmosphere for 48 h and characterization analysis conducted using ultra violet visible (UV-vis) spectrometry for spectral properties, transmission electron microscopy (TEM) for morphological features and zeta potential measurement for surface stability and size distribution of the compound obtained or of the multiple particles delivery complex (MPDC)...
July 17, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28705382/impact-of-cardiorespiratory-fitness-and-risk-of-systemic-hypertension-in-nonobese-versus-obese-men-who-are-metabolically-healthy-or-unhealthy
#8
Sae Young Jae, Abraham Samuel Babu, Eun Sun Yoon, Sudhir Kurl, Jari A Laukkanen, Yoon-Ho Choi, Barry A Franklin
Few data are available regarding the influence of body phenotype on systemic hypertension (SH) and whether cardiorespiratory fitness (CRF) attenuates this relation. We tested the hypothesis that obesity phenotypes and CRF would predict incident hypertension, evaluating 3,800 Korean men who participated in 2 health examinations in1998 to 2009. All participants were normotensive at baseline and were divided into 4 groups based on body mass index using the Asia-Pacific descriptors for obesity and metabolic health status and the National Cholesterol Education Program's adult treatment panel III (ATP-III) criteria...
June 15, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28653216/nmr-characterization-of-htpg-the-e-coli-hsp90-using-sparse-labeling-with-13-c-methyl-alanine
#9
Kari Pederson, Gordon R Chalmers, Qi Gao, Daniel Elnatan, Theresa A Ramelot, Li-Chung Ma, Gaetano T Montelione, Michael A Kennedy, David A Agard, James H Prestegard
A strategy for acquiring structural information from sparsely isotopically labeled large proteins is illustrated with an application to the E. coli heat-shock protein, HtpG (high temperature protein G), a 145 kDa dimer. It uses (13)C-alanine methyl labeling in a perdeuterated background to take advantage of the sensitivity and resolution of Methyl-TROSY spectra, as well as the backbone-centered structural information from (1)H-(13)C residual dipolar couplings (RDCs) of alanine methyl groups. In all, 40 of the 47 expected crosspeaks were resolved and 36 gave RDC data...
July 2017: Journal of Biomolecular NMR
https://www.readbyqxmd.com/read/28647120/drrc-protein-of-streptomyces-peucetius-removes-daunorubicin-from-intercalated-dnri-promoter
#10
Francis Prija, Ranjan Prasad
DrrC is a DNA-binding protein of Streptomyces peucetius that provides self-resistance against daunorubicin, the antibiotic produced by the organism. DrrC was expressed in E.coli and purified by using N-terminal MBP-tag which retained DNA-binding property in spite of the tag. Mobility shift assay confirmed the interaction of 313bp DNA that has the dnrI promoter, daunorubicin and MBP-DrrC in the presence of ATP. Biotinylated and immobilized 313bp DNA was intercalated with daunorubicin to observe the release of the drug when MBP-DrrC is allowed to act on the DNA...
September 2017: Microbiological Research
https://www.readbyqxmd.com/read/28607162/impact-of-age-on-the-association-between-cardiac-high-energy-phosphate-metabolism-and-cardiac-power-in-women
#11
Maria Nathania, Kieren G Hollingsworth, Matthew Bates, Christopher Eggett, Michael I Trenell, Lazar Velicki, Petar M Seferovic, Guy A MacGowan, Doug M Turnbull, Djordje G Jakovljevic
OBJECTIVE: Diminished cardiac high-energy phosphate metabolism (phosphocreatine-to-ATP (PCr:ATP) ratio) and cardiac power with age may play an important roles in development of cardiac dysfunction and heart failure. The study defines the impact of age on PCr:ATP ratio and cardiac power and their relationship. METHODS: Thirty-five healthy women (young≤50 years, n=20; and old≥60 years, n=15) underwent cardiac MRI with (31)P spectroscopy to assess PCr:ATP ratio and performed maximal graded cardiopulmonary exercise testing with simultaneous gas-exchange and central haemodynamic measurements...
June 12, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28584636/atp-serves-an-anti-inflammatory-role-by-enhancing-%C3%AE-defensin-2-response-in-acute-pneumonia-of-rat
#12
Zhenwei Shen, Yun Zhou, Le Qu, Han Lei
The aim of the current study was to evaluate the effect of ATP on the expression of rat β-defensin-2 (rBD-2) in a time-dependent manner, as well as its therapeutic value in an acute pneumonia rat model. A total of 30 rats as a treatment group and 30 as a control group were treated with the same dose of ATP and normal saline, respectively, lung tissues were isolated from rat and expression of rBD-2 mRNA was assessed with reverse transcription-quantitative polymerase chain reaction (RT-qPCR) at 12, 24 and 36 h following treatment...
June 2017: Biomedical Reports
https://www.readbyqxmd.com/read/28570633/thin-silica-shell-coated-ag-assembled-nanostructures-for-expanding-generality-of-sers-analytes
#13
Myeong Geun Cha, Hyung-Mo Kim, Yoo-Lee Kang, Minwoo Lee, Homan Kang, Jaehi Kim, Xuan-Hung Pham, Tae Han Kim, Eunil Hahm, Yoon-Sik Lee, Dae Hong Jeong, Bong-Hyun Jun
Surface-enhanced Raman scattering (SERS) provides a unique non-destructive spectroscopic fingerprint for chemical detection. However, intrinsic differences in affinity of analyte molecules to metal surface hinder SERS as a universal quantitative detection tool for various analyte molecules simultaneously. This must be overcome while keeping close proximity of analyte molecules to the metal surface. Moreover, assembled metal nanoparticles (NPs) structures might be beneficial for sensitive and reliable detection of chemicals than single NP structures...
2017: PloS One
https://www.readbyqxmd.com/read/28551786/mitochondrial-bioenergetics-during-ischemia-and-reperfusion
#14
Alicia E Consolini, María I Ragone, Patricia Bonazzola, Germán A Colareda
During ischemia and reperfusion (I/R) mitochondria suffer a deficiency to supply the cardiomyocyte with chemical energy, but also contribute to the cytosolic ionic alterations especially of Ca(2+). Their free calcium concentration ([Ca(2+)]m) mainly depends on mitochondrial entrance through the uniporter (UCam) and extrusion in exchange with Na(+) (mNCX) driven by the electrochemical gradient (ΔΨm). Cardiac energetic is frequently estimated by the oxygen consumption, which determines metabolism coupled to ATP production and to the maintaining of ΔΨm...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28541258/paclitaxel-induced-painful-neuropathy-is-associated-with-changes-in-mitochondrial-bioenergetics-glycolysis-and-an-energy-deficit-in-dorsal-root-ganglia-neurons
#15
Natalie A Duggett, Lisa A Griffiths, Sarah J L Flatters
Painful neuropathy is the major dose-limiting side effect of paclitaxel chemotherapy. Mitochondrial dysfunction and adenosine triphosphate (ATP) deficit have previously been shown in peripheral nerves of paclitaxel-treated rats, but the effects of paclitaxel in the dorsal root ganglia (DRGs) have not been explored. The aim of this study was to determine the bioenergetic status of DRG neurons following paclitaxel exposure in vitro and in vivo. Utilising isolated DRG neurons, we measured respiratory function under basal conditions and at maximal capacity, glycolytic function, and Adenosine diphosphate (ADP)/ATP levels at 3 key behavioural timepoints; prior to pain onset (day 7), peak pain severity and pain resolution...
August 2017: Pain
https://www.readbyqxmd.com/read/28527013/central-activation-metabolites-and-calcium-handling-during-fatigue-with-repeated-maximal-isometric-contractions-in-human-muscle
#16
Simeon P Cairns, Luke A G Inman, Caroline P MacManus, Ingrid G L van de Port, Patricia A Ruell, Jeanette M Thom, Martin W Thompson
PURPOSE: To determine the roles of calcium (Ca(2+)) handling by sarcoplasmic reticulum (SR) and central activation impairment (i.e., central fatigue) during fatigue with repeated maximal voluntary isometric contractions (MVC) in human muscles. METHODS: Contractile performance was assessed during 3 min of repeated MVCs (7-s contraction, 3-s rest, n = 17). In ten participants, in vitro SR Ca(2+)-handling, metabolites, and fibre-type composition were quantified in biopsy samples from quadriceps muscle, along with plasma venous [K(+)]...
August 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28485811/the-effects-of-second-messenger-camp-and-its-relative-components-on-the-contraction-of-uterine-smooth-muscle-of-rat
#17
S-J Shu, X-G Lei, J-H Liang, Y-H Song, Q Xu, X-D Chen, L-G Mao, Z-G Li
OBJECTIVE: To investigate the effect of second messenger pathways on the uterine smooth muscle contraction and their associated mechanisms, and compare the evaluation methods. MATERIALS AND METHODS: Preparation of uterine smooth muscle strips from healthy pregnant 18-21 d SD and non-pregnant rats. When the contraction of muscle strips was stable, we conducted gradient administration: PDE4 inhibitors (Z90), prostaglandin PGE2, adenylate cyclase inhibitor (SQ 22,530), cAMP analogs (dbcAMP) and AMPK agonists (AICAR), solvent dimethyl sulfoxide (DMSO) as controlled...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28428881/nano-pulse-stimulation-is-a-physical-modality-that-can-trigger-immunogenic-tumor-cell-death
#18
Richard Nuccitelli, Amanda McDaniel, Snjezana Anand, John Cha, Zachary Mallon, Jon Casey Berridge, Darrin Uecker
BACKGROUND: We have been developing a non-thermal, drug-free tumor therapy called Nano-Pulse Stimulation (NPS) that delivers ultrashort electric pulses to tumor cells which eliminates the tumor and inhibits secondary tumor growth. We hypothesized that the mechanism for inhibiting secondary tumor growth involves stimulating an adaptive immune response via an immunogenic form of apoptosis, commonly known as immunogenic cell death (ICD). ICD is characterized by the emission of danger-associated molecular patterns (DAMPs) that serve to recruit immune cells to the site of the tumor...
2017: Journal for Immunotherapy of Cancer
https://www.readbyqxmd.com/read/28423017/auxotonic-to-isometric-contraction-transitioning-in-a-beating-heart-causes-myosin-step-size-to-down-shift
#19
Thomas P Burghardt, Xiaojing Sun, Yihua Wang, Katalin Ajtai
Myosin motors in cardiac ventriculum convert ATP free energy to the work of moving blood volume under pressure. The actin bound motor cyclically rotates its lever-arm/light-chain complex linking motor generated torque to the myosin filament backbone and translating actin against resisting force. Previous research showed that the unloaded in vitro motor is described with high precision by single molecule mechanical characteristics including unitary step-sizes of approximately 3, 5, and 8 nm and their relative step-frequencies of approximately 13, 50, and 37%...
2017: PloS One
https://www.readbyqxmd.com/read/28396595/p2y6-deficiency-increases-micturition-frequency-and-attenuates-sustained-contractility-of-the-urinary-bladder-in-mice
#20
Satoru Kira, Mitsuharu Yoshiyama, Sachiko Tsuchiya, Eiji Shigetomi, Tatsuya Miyamoto, Hiroshi Nakagomi, Keisuke Shibata, Tsutomu Mochizuki, Masayuki Takeda, Schuichi Koizumi
The role of the P2Y6 receptor in bladder function has recently attracted a great deal of attention in lower urinary tract research. We conducted this study to determine contributions of the P2Y6 receptor in lower urinary tract function of normal phenotypes by comparing P2Y6-deficient mice and wild-type mice. In in vivo experiments, P2Y6-deficient mice had more frequent micturition with smaller bladder capacity compared to wild-type mice; however, there was no difference between these groups in bladder-filling pressure/volume relationships during cystometry under decerebrate, unanaesthetized conditions...
April 10, 2017: Scientific Reports
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