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https://www.readbyqxmd.com/read/29218398/enhanced-hemoglobin-oxygen-unloading-in-migratory-salmonids
#1
Jacelyn J Shu, Till S Harter, Phillip R Morrison, Colin J Brauner
Recent findings indicate that some teleost fishes may be able to greatly enhance hemoglobin-oxygen (Hb-O2) unloading at the tissues under conditions that result in catecholamine release. The putative mechanism relies on the high pH sensitivity of teleost hemoglobin (Hb), intracellular red blood cell (RBC) pH regulation via β-adrenergic Na+/H+ exchanger (β-NHE) activity, and plasma-accessible carbonic anhydrase at the tissues that short-circuits RBC pH regulation. Previous studies have shown that in rainbow trout, this system may double Hb-O2 unloading to red muscle compared to a situation without short-circuiting...
December 7, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/29212874/the-na-k-h-exchanger-nhx1-controls-multivesicular-body-vacuolar-lysosome-fusion
#2
Mahmoud Abdul Karim, Christopher Leonard Brett
Loss-of-function mutations in human endosomal Na+(K+)/H+ Exchangers (NHEs) NHE6 and NHE9 are implicated in neurological disorders including Christianson Syndrome, autism and attention deficit and hyperactivity disorder (ADHD). These mutations disrupt retention of surface receptors within neurons and glial cells by affecting their delivery to lysosomes for degradation. However, the molecular basis of how these endosomal NHEs control endocytic trafficking is unclear. Using Saccharomyces cerevisiae as a model, we conducted cell-free organelle fusion assays to show that transport activity of the orthologous endosomal NHE Nhx1 is important for multivesicular body (MVB)-vacuolar lysosome fusion, the last step of endocytosis required for surface protein degradation...
December 6, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/29209224/na-h-exchanger-3-is-expressed-in-two-distinct-types-of-ionocyte-and-probably-augments-ammonia-excretion-in-one-of-them-in-the-gills-of-the-climbing-perch-exposed-to-seawater
#3
Xiu L Chen, Biyan Zhang, You R Chng, Jasmine L Y Ong, Shit F Chew, Wai P Wong, Siew H Lam, Yuen K Ip
The freshwater climbing perch, Anabas testudineus, is an euryhaline teleost and an obligate air-breather with the ability to actively excrete ammonia. Members of the Na+/H+ exchanger (NHE) family help maintain intracellular pH homeostasis and ionic balance through the electroneutral exchange of Na+ and H+. This study aimed to obtain, from the gills of A. testudineus, the full cDNA coding sequence of nhe3, and to determine the effects of exposure to seawater or 100 mmol l-1 of NH4Cl in fresh water on its mRNA and protein expression levels...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29201052/rapid-action-of-aldosterone-on-protein-levels-of-sodium-hydrogen-exchangers-and-protein-kinase-c-beta-isoforms-in-rat-kidney
#4
Somchit Eiam-Ong, Mookda Chaipipat, Krissanapong Manotham, Somchai Eiam-Ong
Previous in vitro studies demonstrated that aldosterone rapidly activates sodium-hydrogen exchangers 1 and 3 (NHE 1 and 3). In vitro investigations revealed that protein kinase C (PKC) regulates NHE properties. We previously demonstrated that aldosterone rapidly enhances PKCα protein abundance in the rat kidney. There are no reports of renal PKCβ (I and II) protein levels related to the regulation by aldosterone. There are also no in vivo data regarding the rapid effects of aldosterone on renal protein levels of NHE (1 and 3) and PKCβ (I and II), simultaneously...
2017: International Journal of Endocrinology
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
#5
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/29192837/effects-of-the-nordic-hamstring-exercise-on-sprint-capacity-in-male-football-players-a-randomized-controlled-trial
#6
Lasse Ishøi, Per Hölmich, Per Aagaard, Kristian Thorborg, Thomas Bandholm, Andreas Serner
This assessor-blinded, randomized controlled superiority trial investigated the efficacy of the 10-week Nordic Hamstring exercise (NHE) protocol on sprint performance in football players. Thirty-five amateur male players (age: 17-26 years) were randomized to a do-as-usual control group (CG; n = 17) or to 10-weeks of supervised strength training using the NHE in-season (IG; n = 18). A repeated-sprint test, consisting of 4 × 6 10 m sprints, with 15 s recovery period between sprints and 180 s between sets, was conducted to evaluate total sprint time as the primary outcome...
December 1, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29189986/1h-13c-and-15n-chemical-shift-assignments-of-a-g-quadruplex-forming-sequence-within-the-kras-proto-oncogene-promoter-region
#7
Julien Marquevielle, M V Vasantha Kumar, Jean-Louis Mergny, Gilmar F Salgado
Single stranded guanine rich DNA (or RNA) sequences adopt noncanonical secondary structures called G-quadruplexes (G4). Functionally, quadruplexes control gene transcription and regulate activities such as replication, gene recombination or alternative splicing. Hence they are potential targets for cancer, neuronal, and viral related diseases. KRAS is one of the most mutated oncogenes in the genome of cancer cells and contains a nuclease hypersensitive element (NHE) sequence capable of forming G-quadruplexes via its six runs of guanines...
November 30, 2017: Biomolecular NMR Assignments
https://www.readbyqxmd.com/read/29177025/acute-exposure-to-cigarette-smoking-followed-by-myocardial-infarction-aggravates-renal-damage-in-an-in-vivo-mouse-model
#8
Firas Kobeissy, Abdullah Shaito, Abdullah Kaplan, Lama Baki, Hassan Hayek, Carole Dagher-Hamalian, Ali Nehme, Rana Ghali, Emna Abidi, Ahmad Husari, Asad Zeidan, Fouad A Zouein, Kazem Zibara
Cigarette smoking (S) is a risk factor for progressive chronic kidney disease, renal dysfunction, and renal failure. In this study, the effect of smoking on kidney function was investigated in a mouse model of myocardial infarction (MI) using 4 groups: control (C), smoking (S), MI, and S+MI. Histological analysis of S+MI group showed alterations in kidney structure including swelling of the proximal convoluted tubules (PCTs), thinning of the epithelial lining, focal loss of the brush border of PCTs, and patchy glomerular retraction...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29169695/immunohistochemical-analysis-of-the-distribution-of-molecules-involved-in-ionic-and-ph-regulation-in-the-lancelet-branchiostoma-floridae-hubbs-1922
#9
Ivan Cuoghi, Clara Lazzaretti, Mauro Mandrioli, Lucrezia Mola, Aurora Pederzoli
The aim of present work is to analyse the distribution of carbonic anhydrase II (CAII), cystic fibrosis transmembrane regulator (CFTR), vacuolar-type H(+)-ATPase (V-H(+)-ATPase), Na(+)/K(+) ATPase, Na(+)/H(+) exchanger (NHE) and SLC26A6 (solute carrier family 26, member 6), also known as pendrin protein, in the lancelet Branchiostoma floridae in order to go in depth in the evolution of osmoregulation and pH regulation in Chordates. In view of their phylogenetic position, lancelets may indeed provide a critical point of reference for studies on osmoregulation evolution in Chordates...
November 20, 2017: Acta Histochemica
https://www.readbyqxmd.com/read/29166001/a-redox-role-for-the-4fe4s-cluster-of-yeast-dna-polymerase-%C3%AE
#10
Phillip L Bartels, Joseph L Stodola, Peter M J Burgers, Jacqueline K Barton
A [4Fe4S]2+ cluster in the C-terminal domain of the catalytic subunit of the eukaryotic B-family DNA polymerases is essential for the formation of active multi-subunit complexes. Here we use a combination of electrochemical and biochemical methods to assess the redox activity of the [4Fe4S]2+ cluster in Saccharomyces cerevisiae polymerase (Pol) δ, the lagging strand DNA polymerase. We find that Pol δ bound to DNA is indeed redox-active at physiological potentials, generating a DNA-mediated signal electrochemically with a midpoint potential of 113 ± 5 mV versus NHE...
November 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29143379/region-dependent-hamstrings-activity-in-nordic-hamstring-exercise-and-stiff-leg-deadlift-defined-with-high-density-emg
#11
András Hegyi, Annamária Péter, Taija Finni, Neil J Cronin
Recent studies suggest region-specific metabolic activity in hamstring muscles during injury prevention exercises, but the neural representation of this phenomenon is unknown. The aim of this study was to examine whether regional differences are evident in the activity of biceps femoris long head (BFlh) and semitendinosus (ST) muscles during two common injury prevention exercises. Twelve male participants without a history of hamstring injury performed the Nordic hamstring exercise (NHE) and stiff-leg deadlift (SDL) while BFlh and ST activity were recorded with high-density electromyography (HD-EMG)...
November 15, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29101173/ph-recovery-from-a-proton-load-in-rat-cardiomyocytes-effects-of-chronic-exercise
#12
Vennetia R Danes, Josephine Anthony, Kaveh Rayani, Kenneth W Spitzer, Glen F Tibbits
The ability of cardiomyocytes to recover from a proton load was examined in the hearts of exercise-trained (T) and sedentary control (C) rats in CO2/HCO3--free media. Acidosis was created by the NH4Cl pre-pulse technique and pHi was determined using fluorescence microscopy on carboxy-SNARF-1 AM loaded isolated cardiomyocytes. CO2-independent intracellular pH buffering capacity (βi) was measured by incrementally reducing the [NH4Cl]o in steps of 50% from 20 to 1.25 mM. βi increased as pHi decreased in both T and C groups...
November 3, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29052339/structure-activity-and-stability-relationships-for-cobalt-polypyridyl-based-hydrogen-evolving-catalysts-in-water
#13
Stephan Schnidrig, Cyril Bachmann, Peter Müller, Nicola Weder, Bernhard Spingler, Evelyne Joliat-Wick, Mathias Mosberger, Johannes Windisch, Roger Alberto, Benjamin Probst
A series of eight new and three known cobalt polypyridyl-based hydrogen-evolving catalysts (HECs) with distinct electronic and structural differences are benchmarked in photocatalytic runs in water. Methylene-bridged bis-bipyridyl is the preferred scaffold, both in terms of stability and rate. For a cobalt complex of the tetradentate methanol-bridged bispyridyl-bipyridyl complex [Co(II) Br(tpy)]Br, a detailed mechanistic picture is obtained by combining electrochemistry, spectroscopy, and photocatalysis. In the acidic branch, a proton-coupled electron transfer, assigned to formation of Co(III) -H, is found upon reduction of Co(II) , in line with a pKa (Co(III) -H) of approximately 7...
October 19, 2017: ChemSusChem
https://www.readbyqxmd.com/read/29047272/three-dimensional-lupinus-like-tio2-nanorod-sn3o4-nanosheet-hierarchical-heterostructured-arrays-as-photoanode-for-enhanced-photoelectrochemical-performance
#14
Luping Zhu, Hao Lu, Dong Hao, Lingling Wang, Zihua Wu, Lijun Wang, Peng Li, Jinhua Ye
A novel photoelectrode of three-dimensional (3D) lupinus-like TiO2 nanorod@Sn3O4 nanosheet hierarchical heterostructured arrays (TiO2@Sn3O4 HHAs) on a transparent F-doped SnO2 glass substrate was designed and fabricated by a two-step solvothermal growth process. Photoelectrochemical (PEC) measurements showed that the 3D lupinus-like TiO2@Sn3O4 HHAs photoelectrode displayed enhanced photocurrent density (3-fold increase with respect to that of pure TiO2), improved conversion efficiency, more negative onset potential (from -0...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29039183/electrochemically-generated-cis-carboxylato-coordinated-iron-iv-oxo-acid-base-congeners-as-promiscuous-oxidants-of-water-pollutants
#15
David P de Sousa, Christopher J Miller, Yingyue Chang, T David Waite, Christine J McKenzie
The nonheme iron(IV) oxo complex [Fe(IV)(O)(tpenaH)](2+) and its conjugate base [Fe(IV)(O)(tpena)](+) [tpena(-) = N,N,N'-tris(2-pyridylmethyl)ethylenediamine-N'-acetate] have been prepared electrochemically in water by bulk electrolysis of solutions prepared from [Fe(III)2(μ-O)(tpenaH)2](ClO4)4 at potentials over 1.3 V (vs NHE) using inexpensive and commercially available carbon-based electrodes. Once generated, these iron(IV) oxo complexes persist at room temperature for minutes to half an hour over a wide range of pH values...
October 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29038209/activation-and-inhibition-of-sodium-hydrogen-exchanger-is-a-mechanism-that-links-the-pathophysiology-and-treatment-of-diabetes-mellitus-with-that-of-heart-failure
#16
REVIEW
Milton Packer
The mechanisms underlying the progression of diabetes mellitus and heart failure are closely intertwined, such that worsening of one condition is frequently accompanied by worsening of the other; the degree of clinical acceleration is marked when the 2 coexist. Activation of the sodium-hydrogen exchanger in the heart and vasculature (NHE1 isoform) and the kidneys (NHE3 isoform) may serve as a common mechanism that links both disorders and may underlie their interplay. Insulin insensitivity and adipokine abnormalities (the hallmarks of type 2 diabetes mellitus) are characteristic features of heart failure; conversely, neurohormonal systems activated in heart failure (norepinephrine, angiotensin II, aldosterone, and neprilysin) impair insulin sensitivity and contribute to microvascular disease in diabetes mellitus...
October 17, 2017: Circulation
https://www.readbyqxmd.com/read/29035047/electrocatalytic-water-oxidation-by-a-water-soluble-copper-ii-complex-with-a-copper-bound-carbonate-group-acting-as-a-potential-proton-shuttle
#17
Fangfang Chen, Ni Wang, Haitao Lei, Dingyi Guo, Hongfei Liu, Zongyao Zhang, Wei Zhang, Wenzhen Lai, Rui Cao
Water-soluble copper(II) complexes of the dianionic tridentate pincer ligand N,N'-2,6-dimethylphenyl-2,6-pyridinedicarboxamidate (L) are catalysts for water oxidation. In [L-Cu(II)-DMF] (1, DMF = dimethylformamide) and [L-Cu(II)-OAc](-) (2, OAc = acetate), ligand L binds Cu(II) through three N atoms, which define an equatorial plane. The fourth coordination site of the equatorial plane is occupied by DMF in 1 and by OAc(-) in 2. These two complexes can electrocatalyze water oxidation to evolve O2 in 0.1 M pH 10 carbonate buffer...
November 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29027700/increases-in-the-expression-of-na-h-exchanger-1-and-3-are-associated-with-insulin-signalling-in-the-ruminal-epithelium
#18
L Yan, Z Shen, Z Lu
Na(+) /H(+) exchanger (NHE), which catalyses the exchange of extracellular Na(+) for intracellular H(+) , is of importance in the maintenance of Na(+) and pH homoeostasis for rumen epithelial cells. Studies in ruminants showed that high concentrate diets could increase the expression of NHE in ruminal epithelium. Results of recent studies further indicated that insulin, as an important hormone closely related to dietary concentrate, could enhance the expression of NHE. In this study, we have investigated the mechanisms of insulin regulating the expression of NHE in rumen epithelial cells and its potential role in dietary modulation of NHE expression in ruminal epithelium of cows...
October 13, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29023122/water-photo-oxidation-initiated-by-surface-bound-organic-chromophores
#19
Michael S Eberhart, Degao Wang, Renato N Sampaio, Seth L Marquard, Bing Shan, M Kyle Brennaman, Gerald J Meyer, Christopher Dares, Thomas J Meyer
Organic chromophores can be synthesized by established methods and offer an opportunity to expand overall solar spectrum utilization for dye-sensitized photoelectrosynthesis cells. However, there are complications in the use of organic chromophores arising from the instability of their oxidized forms, the inability of their oxidized forms to activate a water oxidation catalyst, or the absence of a sufficiently reducing excited state for electron injection into appropriate semiconductors. Three new triarylamine donor-acceptor organic dyes have been investigated here for visible-light-driven water oxidation...
October 31, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28936507/a-pyrene-modified-cobalt-salophen-complex-immobilized-on-multiwalled-carbon-nanotubes-acting-as-a-precursor-for-efficient-electrocatalytic-water-oxidation
#20
Ting-Ting Li, Jinjie Qian, Qianqian Zhou, Jian-Li Lin, Yue-Qing Zheng
Immobilization of earth-abundant water oxidation catalysts (WOCs) on carbon supports to produce functional electrodes for electrochemical water splitting is a crucial approach for future clean energy production. Herein we report the non-covalent immobilization of a pyrene-bearing cobalt(ii) Schiff base complex (2) on the surface of multiwalled carbon nanotubes (MWCNTs) to form a hybrid anode for electrocatalytic water oxidation. The 2/MWCNT anode displayed excellent catalytic activity and durability in neutral aqueous solution, and a catalytic current density of 1...
September 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
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