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https://www.readbyqxmd.com/read/29055103/mitochondrial-ca-2-dynamics-in-cells-and-suspensions
#1
Benjamin Wacquier, Hugo E Romero C, Virginia González-Vélez, Laurent Combettes, Geneviève Dupont
Mitochondria play a significant role in shaping cytosolic Ca(2+) signals. Thus, Ca(2+) transfers across the mitochondrial membrane are much studied, not only in intact cells but also in artificial systems such as mitochondrial suspensions or permeabilised cells. Observed rates of Ca(2+) changes vary by at least one order of magnitude. In this work, we investigate the relationship between the Ca(2+) dynamics observed in various experimental conditions using a computational model calibrated on experimental data...
October 21, 2017: FEBS Journal
https://www.readbyqxmd.com/read/29048915/chiral-and-racemic-spin-crossover-polymorphs-in-a-family-of-mononuclear-iron-ii-compounds
#2
Carlos Bartual-Murgui, Lucía Piñeiro-López, F Javier Valverde-Muñoz, M Carmen Muñoz, Maksym Seredyuk, José Antonio Real
Understanding the origin of cooperativity and the equilibrium temperature of transition (T1/2) displayed by the spin-crossover (SCO) compounds as well as controlling these parameters are of paramount importance for future applications. For this task, the occurrence of polymorphism, presented by a number of SCO complexes, may provide deep insight into the influence of the supramolecular organization on the SCO behavior. In this context, herein we present a novel family of mononuclear octahedral Fe(II) complexes with formula cis-[Fe(bqen)(NCX)2], where bqen is the chelating tetradentate ligand N,N'-bis(8-quinolyl)ethane-1,2-diamine and X = S, Se...
October 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29026150/essential-role-of-the-na-ca2-exchanger-ncx-in-glutamate-enhanced-cell-survival-in-cardiac-cells-exposed-to-hypoxia-reoxygenation
#3
Marta Maiolino, Pasqualina Castaldo, Vincenzo Lariccia, Silvia Piccirillo, Salvatore Amoroso, Simona Magi
Myocardial ischemia culminates in ATP production impairment, ionic derangement and cell death. The provision of metabolic substrates during reperfusion significantly increases heart tolerance to ischemia by improving mitochondrial performance. Under normoxia, glutamate contributes to myocardial energy balance as substrate for anaplerotic reactions, and we demonstrated that the Na(+)/Ca(2+) exchanger1 (NCX1) provides functional support for both glutamate uptake and use for ATP synthesis. Here we investigated the role of NCX1 in the potential of glutamate to improve energy metabolism and survival of cardiac cells subjected to hypoxia/reoxygenation (H/R)...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29023784/plasma-membrane-ca-2-atpase-1-is-required-for-maintaining-atrial-ca-2-homeostasis-and-electrophysiological-stability-in-the-mouse
#4
Yanwen Wang, Claire Wilson, Elizabeth J Cartwright, Ming Lei
To determine the role of PMCA1 in maintaining Ca(2+) homeostasis and electrical stability in the atrium under physiological and stress conditions, mice with a cardiomyocyte-specific deletion of PMCA1 (PMCA1(cko) ) and their control littermates (PMCA1(loxP/loxP) ) were studied at the organ and cellular levels.   At the organ level, the PMCA1(cko) hearts became more susceptible to atrial arrhythmias under rapid programmed electrical stimulation (PES) compared with the PMCA1(loxP/loxP) hearts, and such arrhythmic events became more severe under Ca(2+) overload conditions...
October 10, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29021366/no-donors-exhibit-anti-inflammatory-properties-by-modulating-inflammatory-signatures-and-by-regulating-the-life-cycle-of-dendritic-cells
#5
Chiara Ripamonti, Angela Papagna, Claudio Storini, Daniela Miglietta, Maria Foti
NO mediates a variety of physiologic processes and is considered an important intracellular messenger in different cellular systems. Because of its complex regulation and multiple molecular and cellular targets, NO provides both stimulatory and suppressive properties in the immune system. Dendritic cells (DCs) are considered the most potent APCs, whose regulation has important implications in the induction of an effective immune response. In this study, we analyzed the effect of the compound NCX 2057, a new class of NO-releasing derivatives of ferulic acid, on activation and functional properties of DCs...
October 11, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28994760/assessment-of-sarcoplasmic-reticulum-calcium-reserve-and-intracellular-diastolic-calcium-removal-in-isolated-ventricular-cardiomyocytes
#6
Jing Gao, Xiaolu Shi, Hong He, Juhong Zhang, Ding Lin, Guosheng Fu, Dongwu Lai
Intracellular calcium recycling plays a critical role in regulation of systolic and diastolic function in cardiomyocytes. Cardiac sarcoplasmic reticulum (SR) serves as a Ca(2+) reservoir for contraction, which reuptakes intracellular Ca(2+) during relaxation. The SR Ca(2+) reserve available for beats is determinate for cardiac contractibility, and the removal of intracellular Ca(2+) is critical for cardiac diastolic function. Under some pathophysiological conditions, such as diabetes and heart failure, impaired calcium clearance and SR Ca(2+) store in cardiomyocytes may be involved in the progress of cardiac dysfunction...
September 18, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28983248/the-effects-of-sea0400-on-ca-2-transient-amplitude-and-proarrhythmia-depend-on-the-na-ca-2-exchanger-expression-level-in-murine-models
#7
Nils Bögeholz, Jan S Schulte, Sven Kaese, B Klemens Bauer, Paul Pauls, Dirk G Dechering, Gerrit Frommeyer, Joshua I Goldhaber, Uwe Kirchhefer, Lars Eckardt, Christian Pott, Frank U Müller
Background/Objective: The cardiac Na(+)/Ca(2+) exchanger (NCX) has been identified as a promising target to counter arrhythmia in previous studies investigating the benefit of NCX inhibition. However, the consequences of NCX inhibition have not been investigated in the setting of altered NCX expression and function, which is essential, since major cardiac diseases (heart failure/atrial fibrillation) exhibit NCX upregulation. Thus, we here investigated the effects of the NCX inhibitor SEA0400 on the Ca(2+) transient amplitude and on proarrhythmia in homozygous NCX overexpressor (OE) and heterozygous NCX knockout (hetKO) mice compared to corresponding wild-types (WTOE/WThetKO)...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28972668/wenxin-keli-diminishes-ca-2-overload-induced-by-hypoxia-reoxygenation-in-cardiomyocytes-through-inhibiting-inal-and-ical
#8
Antao Luo, Zhipei Liu, Zhenzhen Cao, Jie Hao, Lin Wu, Chen Fu, Mengliu Zeng, Wanzhen Jiang, Peihua Zhang, Buchang Zhao, Tao Zhao, Jing Zhao, Jihua Ma
BACKGROUND: An increase in the late sodium current (INaL ) causes intracellular Na(+) overload and subsequently intracellular Ca(2+) ([Ca(2+) ]i ) overload via the stimulated reverse Na(+) -Ca(2+) exchange (NCX). Wenxin Keli (WXKL) is an effective antiarrhythmic Chinese herb extract, but the underlying mechanisms are unclear. METHODS AND RESULTS: The INaL , NCX current (INCX ), L-type Ca(2+) current (ICaL ) and action potentials (APs) were recorded using the whole-cell patch-clamp technique in rabbit ventricular myocytes...
October 3, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28966144/effects-of-exercise-training-on-excitation-contraction-coupling-calcium-dynamics-and-protein-expression-in-the-heart-of-the-neotropical-fish-brycon-amazonicus
#9
Rafael Zanelli Rissoli, Eliton da Silva Vasconcelos, Francisco Tadeu Rantin, Ana Lúcia Kalinin
Matrinxã (Brycon amazonicus) is a great swimming performance teleost fish from the Amazon basin. However, the possible cardiac adaptations of this ability are still unknown. Therefore, the aim of the present work was to investigate the effects of prolonged exercise (EX group - 60days under 0.4BL·s(-1)) on ventricular contractility by (i) in-vitro analysis of contractility comparing the relative roles of sodium/calcium exchanger (NCX) and sarcoplasmic reticulum (SR) in the excitation-contraction (E-C) coupling and (ii) molecular analysis of NCX, sarcoplasmic reticulum Ca(2+) ATPase (SERCA2) and phospholamban (PLB) expression and quantification...
September 29, 2017: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/28956012/flecainide-ameliorates-arrhythmogenicity-through-ncx-flux-in-andersen-tawil-syndrome-ips-cell-derived-cardiomyocytes
#10
Yusuke Kuroda, Shinsuke Yuasa, Yasuhide Watanabe, Shogo Ito, Toru Egashira, Tomohisa Seki, Tetsuhisa Hattori, Seiko Ohno, Masaki Kodaira, Tomoyuki Suzuki, Hisayuki Hashimoto, Shinichiro Okata, Atsushi Tanaka, Yoshiyasu Aizawa, Mitsushige Murata, Takeshi Aiba, Naomasa Makita, Tetsushi Furukawa, Wataru Shimizu, Itsuo Kodama, Satoshi Ogawa, Norito Kokubun, Hitoshi Horigome, Minoru Horie, Kaichiro Kamiya, Keiichi Fukuda
Andersen-Tawil syndrome (ATS) is a rare inherited channelopathy. The cardiac phenotype in ATS is typified by a prominent U wave and ventricular arrhythmia. An effective treatment for this disease remains to be established. We reprogrammed somatic cells from three ATS patients to generate induced pluripotent stem cells (iPSCs). Multi-electrode arrays (MEAs) were used to record extracellular electrograms of iPSC-derived cardiomyocytes, revealing strong arrhythmic events in the ATS-iPSC-derived cardiomyocytes...
March 2017: Biochemistry and Biophysics Reports
https://www.readbyqxmd.com/read/28945810/spontaneous-local-diastolic-subsarcolemmal-calcium-releases-in-single-isolated-guinea-pig-sinoatrial-nodal-cells
#11
Syevda G Sirenko, Dongmei Yang, Larissa A Maltseva, Mary S Kim, Edward G Lakatta, Victor A Maltsev
Uptake and release calcium from the sarcoplasmic reticulum (SR) (dubbed "calcium clock"), in the form of spontaneous, rhythmic, local diastolic calcium releases (LCRs), together with voltage-sensitive ion channels (membrane clock) form a coupled system that regulates the action potential (AP) firing rate. LCRs activate Sodium/Calcium exchanger (NCX) that accelerates diastolic depolarization and thus participating in regulation of the time at which the next AP will occur. Previous studies in rabbit SA node cells (SANC) demonstrated that the basal AP cycle length (APCL) is tightly coupled to the basal LCR period (time from the prior AP-induced Ca2+ transient to the diastolic LCR occurrence), and that this coupling is further modulated by autonomic receptor stimulation...
2017: PloS One
https://www.readbyqxmd.com/read/28937745/mononuclear-fe-ii-complexes-based-on-the-methylpyrazinyl-diamine-ligand-chemical-thermo-and-photocontrol-of-their-magnetic-switchability
#12
Xue Liu, Jian Zhou, Xin Bao, Zheng Yan, Guo Peng, Mathieu Rouzières, Corine Mathonière, Jun-Liang Liu, Rodolphe Clérac
Two new mononuclear Fe(II) complexes, [Fe((2Me)Lpz)(NCX)2] (L = N,N'-dimethyl-N,N'-bis((pyrazin-2-yl)methyl)-1,2-ethanediamine and X = S (1), BH3 (2)), have been synthesized and characterized by single-crystal X-ray diffraction, magnetic, optical reflectivity, and photomagnetic measurements. They have similar FeN6 coordination environments offered by the tetradentate ligand with a cis-α conformation and two NCX(-) coligands in cis positions. However, 1 and 2 have different molecular arrangements and crystal packings, and are isolated in orthorhombic Pbnb and monoclinic C2/c space groups, respectively...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28924617/dynamics-of-sodium-current-mediated-early-afterdepolarizations
#13
Daisuke Sato, Colleen E Clancy, Donald M Bers
Early afterdepolarizations (EADs) have been attributed to two primary mechanisms: 1) recovery from inactivation of the L-type calcium (Ca) channel and/or 2) spontaneous Ca release, which depolarizes the membrane potential through the electrogenic sodium-calcium exchanger (NCX). The sodium (Na) current (INa), especially the late component of the Na current, has been recognized as an important player to set up the conditions for EADs by reducing repolarization reserve and increasing intracellular Na concentration, which leads to Ca overload...
September 2017: Heliyon
https://www.readbyqxmd.com/read/28867737/fluorescence-analysis-of-the-mitochondrial-effect-of-a-plasmalemmal-na-ca-2-exchanger-inhibitor-sea0400-in-permeabilized-h9c2-cardiomyocytes
#14
Iyuki Namekata, Shogo Hamaguchi, Naoko Iida-Tanaka, Taichi Kusakabe, Keisuke Kato, Toru Kawanishi, Hikaru Tanaka
We investigated the effect on mitochondrial Ca(2+) of SEA0400, an inhibitor of the Na(+)/Ca(2+) exchanger (NCX) which reduces mitochondrial Ca(2+) overload during myocardial ischemia, in digitonin-permeabilized H9c2 cells expressing the mitochondrial-targeted Ca(2+) indicator, yellow cameleon 3.1. The elevation of mitochondrial Ca(2+) concentration caused by an increase in extramitochondrial Ca(2+) concentration was inhibited by carbonyl cyanide p-(trifluoromethoxy) phenylhydrazone (FCCP) or ruthenium red, but enhanced by CGP-37157, a mitochondrial NCX inhibitor...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28859328/are-interferon-related-biomarkers-advantageous-for-monitoring-disease-activity-in-systemic-lupus-erythematosus-a-longitudinal-benchmark-study
#15
Thomas Rose, Andreas Grützkau, Jens Klotsche, Philipp Enghard, Alexandra Flechsig, Johannes Keller, Gabriela Riemekasten, Andreas Radbruch, Gerd-Rüdiger Burmester, Thomas Dörner, Falk Hiepe, Robert Biesen
Objective: To determine the clinical value of six traditional and three IFN-related biomarkers in monitoring disease activity (DA) in SLE. Methods: Prospective longitudinal study of IFNα, IFNγ-inducible protein 10 (IP-10) and sialic acid-binding Ig-like lectin 1 (SIGLEC1) vs antibodies against dsDNA (ELISA and Farr radioimmunoassay), dsDNA-complexed nucleosomes (anti-dsDNA-NcX: ELISA), nucleosomes (ANuA: ELISA) and complement C3/C4 for correlation with DA (measured by BILAG 2004 index) in 26 SLE patients (77 visits)...
September 1, 2017: Rheumatology
https://www.readbyqxmd.com/read/28847141/na%C3%A2-%C2%BA-ca%C3%A2-%C3%A2-%C2%BA-exchanger-2-ncx2-in-the-circadian-clock-of-the-rat-suprachiasmatic-nucleus-colocalization-with-neuropeptides-and-daily-profiles-of-gene-expression-and-protein-levels
#16
Pi-Cheng Cheng, Ya-Shuan Chen, Rong-Chi Huang
The plasmalemmal Na⁺/Ca²⁺ changer (NCX) regulates intracellular Ca²⁺ by exchanging 3 Na⁺ for 1 Ca²⁺ in either the Ca²⁺ exit or Ca²⁺ entry mode. All three NCX isoforms NCX1, NCX2, and NCX3 are expressed in the rat brain, with isoform-specific differential distribution. In the central clock of suprachiasmatic nucleus (SCN), intracellular Ca²⁺ controls the circadian release of major neuropeptides, which are the arginine vasopressin (AVP), vasoactive intestinal peptide (VIP) and gastrin releasing peptide (GRP), and the NCX, most likely NCX1, rapidly clears depolarization-induced somatic Ca²⁺ influx...
August 31, 2017: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/28822764/effect-of-nitric-oxide-releasing-derivative-of-indomethacin-on-prevotella-intermedia-lipopolysaccharide-induced-production-of-proinflammatory-mediators-in-murine-macrophages
#17
So-Hui Choe, Eun-Young Choi, Jin-Yi Hyeon, In Soon Choi, Sung-Jo Kim
The purpose of this study was to investigate the influences of NCX 2121, a nitric oxide (NO)-releasing derivative of indomethacin, upon the generation of proinflammatory mediators using murine macrophages activated by lipopolysaccharide (LPS) isolated from Prevotella intermedia, which is one of the pathogens implicated in periodontal diseases. Inducible NO synthase (iNOS)-derived NO, IL-1β and IL-6 as well as their relevant mRNA were significantly attenuated by NCX 2121 in RAW264.7 cells activated by P. intermedia LPS...
October 14, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28813704/p38-kinase-sgk1-and-nf-%C3%AE%C2%BAb-dependent-up-regulation-of-na-ca2-exchanger-expression-and-activity-following-tgf%C3%A3-1-treatment-of-megakaryocytes
#18
Tamer Al-Maghout, Lisann Pelzl, Itishri Sahu, Basma Sukkar, Zohreh Hosseinzadeh, Ravi Gutti, Stefan Laufer, Jakob Voelkl, Burkert Pieske, Meinrad Gawaz, Florian Lang
BACKGROUND: TGFβ1, a decisive regulator of megakaryocyte maturation and platelet formation, has previously been shown to up-regulate both, store operated Ca2+ entry (SOCE) and Ca2+ extrusion by Na+/Ca2+ exchange. The growth factor thus augments the increase of cytosolic Ca2+ activity ([Ca2+]i) following release of Ca2+ from intracellular stores and accelerates the subsequent decline of [Ca2+]i. The effect on SOCE is dependent on a signaling cascade including p38 kinase, serum & glucocorticoid inducible kinase SGK1, and nuclear factor NFκB...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28792496/stabilization-of-diastolic-calcium-signal-via-calcium-pump-regulation-of-complex-local-calcium-releases-and-transient-decay-in-a-computational-model-of-cardiac-pacemaker-cell-with-individual-release-channels
#19
Alexander V Maltsev, Victor A Maltsev, Michael D Stern
Intracellular Local Ca releases (LCRs) from sarcoplasmic reticulum (SR) regulate cardiac pacemaker cell function by activation of electrogenic Na/Ca exchanger (NCX) during diastole. Prior studies demonstrated the existence of powerful compensatory mechanisms of LCR regulation via a complex local cross-talk of Ca pump, release and NCX. One major obstacle to study these mechanisms is that LCR exhibit complex Ca release propagation patterns (including merges and separations) that have not been characterized. Here we developed new terminology, classification, and computer algorithms for automatic detection of numerically simulated LCRs and examined LCR regulation by SR Ca pumping rate (Pup) that provides a major contribution to fight-or-flight response...
August 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28780165/the-na-ca-2-exchanger-and-the-plasma-membrane-ca-2-atpase-in-%C3%AE-cell-function-and-diabetes
#20
REVIEW
André Herchuelz, Nathalie Pachera
The rat pancreatic β-cell expresses 6 splice variants of the Plasma Membrane Ca(2+)-ATPase (PMCA) and two splice variants of the Na(+)/Ca(2+) exchanger 1 (NCX1). In the β-cell Na(+)/Ca(2+) exchange displays a high capacity, contributes to both Ca(2+) outflow and influx and participates to the control of insulin release. Gain of function studies show that overexpression of PMCA2 or NCX1 leads to endoplasmic reticulum (ER) Ca(2+) depletion with subsequent ER stress, decrease in β-cell proliferation and β-cell death by apoptosis...
August 3, 2017: Neuroscience Letters
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