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https://www.readbyqxmd.com/read/29217667/critical-contribution-of-na-ca2-exchanger-to-the-ca2-mediated-vasodilation-activated-in-endothelial-cells-of-resistance-arteries
#1
Mauricio A Lillo, Pablo S Gaete, Mariela Puebla, Nicolás M Ardiles, Inés Poblete, Alvaro Becerra, Felipe Simon, Xavier F Figueroa
Na+-Ca2+ exchanger (NCX) contributes to control the intracellular free Ca2+ concentration ([Ca2+]i), but the functional activation of NCX reverse mode (NCXrm) in endothelial cells is controversial. We evaluated the participation of NCXrm-mediated Ca2+ uptake in the endothelium-dependent vasodilation of rat isolated mesenteric arterial beds. In phenylephrine-contracted mesenteries, the acetylcholine (ACh)-induced vasodilation was abolished by treatment with the NCXrm blockers SEA0400, KB-R7943, or SN-6. Consistent with that, the ACh-induced hyperpolarization observed in primary cultures of mesenteric endothelial cells and in smooth muscle of isolated mesenteric resistance arteries was attenuated by KB-R7943 and SEA0400, respectively...
December 7, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29212769/functional-and-structural-characterization-of-a-novel-malignant-hyperthermia-susceptible-variant-of-dhpr-%C3%AE-1a-subunit-cacnb1
#2
Claudio F Perez, Jose M Eltit, Jose R Lopez, Dóra Bodnár, Angela F Dulhunty, Shouvik Aditya, Marco G Casarotto
Malignant Hyperthermia (MH) susceptibility has been recently linked to a novel variant of β1a subunit of the dihydropyridine receptor (DHPR), a channel essential for Ca2+ regulation in skeletal muscle. Here we evaluate the effect of the mutant variant V156A on the structure/function of DHPR β1a subunit and assess its role on Ca2+ metabolism of cultured myotubes. Using differential scanning fluorimetry we show that mutation V156A causes a significant reduction in thermal stability of the Src homology 3 (SH3)/Guanylate Kinase (GK) core domain of β1a subunit...
December 6, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/29192360/hyperglycemia-induced-cardiac-contractile-dysfunction-in-the-diabetic-heart
#3
REVIEW
Raphael M Singh, Tahreem Waqar, Frank C Howarth, Ernest Adeghate, Keshore Bidasee, Jaipaul Singh
The development of a diabetic cardiomyopathy is a multifactorial process, and evidence is accumulating that defects in intracellular free calcium concentration [Ca2+]i or its homeostasis are related to impaired mechanical performance of the diabetic heart leading to a reduction in contractile dysfunction. Defects in ryanodine receptor, reduced activity of the sarcoplasmic reticulum calcium pump (SERCA) and, along with reduced activity of the sodium-calcium exchanger (NCX) and alterations in myofilament, collectively cause a calcium imbalance within the diabetic cardiomyocytes...
December 1, 2017: Heart Failure Reviews
https://www.readbyqxmd.com/read/29158789/arecoline-increases-glycolysis-and-modulates-ph-regulator-expression-in-ha22t-vgh-hepatoma-cells-leading-to-increase-of-intracellular-ca-2-reactive-oxygen-species-and-anoikis
#4
Hsiao-Ling Cheng, Wen-Tsan Chang, Yu-Chen Hu, Bau-Shan Hsieh, Tzu-Ching Huang, Inn-Wen Chong, Li-Wen Huang, Kee-Lung Chang
Background: Cancer cells proliferate rapidly and are resistant to cell death, relying on aggravated glycolysis to satisfy their increased demand for energy and biosynthetic precursors. However, this process may create unfavorable microenvironments, such as increased acidity, leading to cytotoxicity. Our previous study demonstrated that arecoline induces anoikis of HA22T/VGH hepatoma cells. The present study aimed to examine if arecoline induced anoikis is related to the glycolytic pathway and explore the underlying mechanisms...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/29155350/the-pmca-pumps-in-genetically-determined-neuronal-pathologies
#5
REVIEW
Tito Calì, Marisa Brini, Ernesto Carafoli
Ca(2+) signals regulate most aspects of animal cell life. They are of particular importance to the nervous system, in which they regulate specific functions, from neuronal development to synaptic plasticity. The homeostasis of cell Ca(2+) must thus be very precisely regulated: in all cells Ca(2+) pumps transport it from the cytosol to the extracellular medium (the Plasma Membrane Ca(2+) ATPases, hereafter referred to as PMCA pumps) or to the lumen of intracellular organelles (the Sarco/Endoplasmatic Reticulum Ca(2+) ATPase and the Secretory Pathway Ca(2+) ATPase, hereafter referred to as SERCA and SPCA pumps, respectively)...
November 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29152764/comparative-transcriptome-analysis-of-the-calcium-signaling-and-expression-analysis-of-sodium-calcium-exchanger-in-aspergillus-cristatus
#6
Xiu-Xiu Ren, Yuchen Wang, YongXiang Liu, Yumei Tan, Chunguang Ren, Yongyi Ge, Zuoyi Liu
Aspergillus cristatus develops into various stages under different Na concentrations: the sexual stage in 0.5 M NaCl and asexual development stage in 3 M NaCl. In order to explore whether the Ca(2+) signaling pathway in A. cristatus responded to the changes in the salt stress, we analyzed the gene expression levels in A. cristatus respectively cultured in 0.5 M NaCl and 3 M NaCl. According to the BLAST analysis results, we identified 25 Ca(2+) -signaling proteins in A. cristatus. The expression levels of most genes involved in the Ca(2+) -signaling pathway in A...
November 20, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/29136153/reverse-ncx-attenuates-cellular-sodium-loading-in-metabolically-compromised-cortex
#7
Niklas J Gerkau, Cordula Rakers, Simone Durry, Gabor C Petzold, Christine R Rose
In core regions of ischemic stroke, disruption of blood flow causes breakdown of ionic gradients and, ultimately, calcium overload and cell death. In the surrounding penumbra, cells may recover upon reperfusion, but recovery is hampered by additional metabolic demands imposed by peri-infarct depolarizations (PIDs). There is evidence that sodium influx drives PIDs, but no data exist on PID-related sodium accumulations in vivo. Here, we found that PIDs in mouse neocortex are associated with propagating sodium elevations in neurons and astrocytes...
November 9, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29133913/nitric-oxide-mediated-inhibition-of-antigen-presentation-from-dcs-to-cd4-t-cells-in-cancer-and-measurement-of-stat1-nitration
#8
Joseph Markowitz, Jiang Wang, Zach Vangundy, Jia You, Vedat Yildiz, Lianbo Yu, Isaac P Foote, Owen E Branson, Andrew R Stiff, Taylor R Brooks, Brandon Biesiadecki, Thomas Olencki, Susheela Tridandapani, Michael A Freitas, Tracey Papenfuss, Mitch A Phelps, William E Carson
Myeloid derived suppressor cells (MDSC) produce nitric oxide (NO) and inhibit dendritic cell (DC) immune responses in cancer. DCs present cancer cell antigens to CD4(+) T cells through Jak-STAT signal transduction. In this study, NO donors (SNAP and DETA-NONOate) inhibited DC antigen presentation. As expected, MDSC isolated from peripheral blood mononuclear cells (PBMC) from cancer patients produced high NO levels. We hypothesized that NO producing MDSC in tumor-bearing hosts would inhibit DC antigen presentation...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29117223/sensitivity-analysis-revealing-the-effect-of-modulating-ionic-mechanisms-on-calcium-dynamics-in-simulated-human-heart-failure
#9
Maria T Mora, Jose M Ferrero, Lucia Romero, Beatriz Trenor
Abnormal intracellular Ca2+ handling is the major contributor to the depressed cardiac contractility observed in heart failure. The electrophysiological remodeling associated with this pathology alters both the action potential and the Ca2+ dynamics, leading to a defective excitation-contraction coupling that ends in mechanical dysfunction. The importance of maintaining a correct intracellular Ca2+ concentration requires a better understanding of its regulation by ionic mechanisms. To study the electrical activity and ionic homeostasis of failing myocytes, a modified version of the O'Hara et al...
2017: PloS One
https://www.readbyqxmd.com/read/29112392/solid-versus-solution-spin-crossover-and-the-importance-of-the%C3%A2-%C3%A2-%C3%A2-%C3%A2-%C3%A2-%C3%A2-%C3%A2-fe-n%C3%A2-c-x-angle
#10
Santiago Rodríguez-Jiménez, Sally Brooker
A new family of mononuclear [Fe(II)(Rdpt)2(NCE)2] complexes (E = S, Se, or BH3) is formed by 1:2 reaction of [Fe(II)(pyridine)4(NCE)2] with the monotopic pyridyl triazole ligand 4-(4-methylphenyl)-3-(2-pyridinyl)-5-phenyl-4H-1,2,4-triazole (tolpyph). The three complexes are obtained as six different solvatomorphs: [Fe(II)(tolpyph)2(NCS)2]·H2O (1·H2O), 1·1.5CH3OH·0.5H2O, [Fe(II)(tolpyph)2(NCSe)2] (2), 2·1.5H2O, [Fe(II)(tolpyph)2(NCBH3)2] (3), and 3·H2O. Single-crystal X-ray diffraction reveals that 1·1...
November 7, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29066415/inotropic-effect-of-ncx-inhibition-depends-on-the-relative-activity-of-the-reverse-ncx-assessed-by-a-novel-inhibitor-orm-10962-on-canine-ventricular-myocytes
#11
Kinga Oravecz, Anita Kormos, Andrea Gruber, Zoltán Márton, Zsófia Kohajda, Leila Mirzaei, Norbert Jost, Jouko Levijoki, Piero Pollesello, Tuula Koskelainen, Leena Otsomaa, András Tóth, Julius Gy Papp, Péter P Nánási, Gudrun Antoons, András Varró, Károly Acsai, Norbert Nagy
Na(+)/Ca(2+) exchanger (NCX) is the main Ca(2+) transporter in cardiac myocytes. Its inhibition could be expected to exert positive inotropic action by accumulation of cytosolic Ca(2+) ([Ca(2+)]i). However, we have observed only a marginal positive inotropic effect upon selective inhibition of NCX, which was enhanced when forward activity was facilitated. Here we attempted to clarify the underlying mechanism of the limited inotropic action of selective NCX inhibition by a novel inhibitor ORM-10962 on canine ventricular myocytes...
October 21, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29055103/mitochondrial-ca-2-dynamics-in-cells-and-suspensions
#12
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
#13
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...
November 6, 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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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