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https://www.readbyqxmd.com/read/29900930/activation-of-camkii%C3%AE-a-promotes-ca-2-leak-from-the-sarcoplasmic-reticulum-in-cardiomyocytes-of-chronic-heart-failure-rats
#1
Le Gui, Xin Guo, Zhe Zhang, Hui Xu, Ya-Wei Ji, Ren-Jun Wang, Jiang-Hua Zhu, Qing-Hui Chen
Activation of the Ca2+ /calmodulin-dependent protein kinase II isoform δA (CaMKIIδA) disturbs intracellular Ca2+ homeostasis in cardiomyocytes during chronic heart failure (CHF). We hypothesized that upregulation of CaMKIIδA in cardiomyocytes might enhance Ca2+ leak from the sarcoplasmic reticulum (SR) via activation of phosphorylated ryanodine receptor type 2 (P-RyR2) and decrease Ca2+ uptake by inhibition of SR calcium ATPase 2a (SERCA2a). In this study, CHF was induced in rats by ligation of the left anterior descending coronary artery...
June 14, 2018: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/29846115/a-model-of-calcium-transport-and-regulation-in-the-proximal-tubule
#2
Aurélie Edwards, Olivier Bonny
The objective of this study was to examine theoretically how Ca2+ reabsorption in the proximal tubule (PT) is modulated by Na+ and water fluxes, parathyroid hormone (PTH), SGLT2 inhibitors, and acetazolamide. To do so, we expanded a previously published mathematical model of water and solute transport in the rat PT (Layton AT, Vallon V, and Edwards A. Am J Physiol Renal Physiol 308: F1343-F1357, 2015) that did not include Ca2+. Our results indicate that Ca2+ reabsorption in the PT is primarily driven by the transepithelial Ca2+ concentration gradient that stems from water reabsorption, which is itself coupled to Na+ reabsorption...
May 30, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29769724/structural-basis-for-gating-pore-current-in-periodic-paralysis
#3
Daohua Jiang, Tamer M Gamal El-Din, Christopher Ing, Peilong Lu, Régis Pomès, Ning Zheng, William A Catterall
Potassium-sensitive hypokalaemic and normokalaemic periodic paralysis are inherited skeletal muscle diseases characterized by episodes of flaccid muscle weakness1,2 . They are caused by single mutations in positively charged residues ('gating charges') in the S4 transmembrane segment of the voltage sensor of the voltage-gated sodium channel Nav 1.4 or the calcium channel Cav 1.11,2 . Mutations of the outermost gating charges (R1 and R2) cause hypokalaemic periodic paralysis1,2 by creating a pathogenic gating pore in the voltage sensor through which cations leak in the resting state3,4 ...
May 16, 2018: Nature
https://www.readbyqxmd.com/read/29760186/hypertrophic-cardiomyopathy-mutations-increase-myofilament-ca-2-buffering-alter-intracellular-ca-2-handling-and-stimulate-ca-2-dependent-signalling
#4
Paul Robinson, Xing Liu, Alexander Sparrow, Suketu Patel, Yin Hua Zhang, Barbara Casadei, Hugh Watkins, Charles S Redwood
Mutations in thin filament regulatory proteins that cause hypertrophic cardiomyopathy (HCM) increase myofilament Ca2+ -sensitivity. Mouse models exhibit increased Ca2+ buffering and arrhythmias, and we hypothesized that these changes are primary effects of the mutations (independent of compensatory changes) and that increased Ca2+ - buffering and altered Ca2+ -handling contribute to HCM pathogenesis via activation of Ca2+ -dependent signalling. Here, we determined the primary effects of HCM mutations on intracellular Ca2+ -handling and Ca2+ -dependent signalling in a model system possessing Ca2+ -handling mechanisms and contractile protein isoforms close to human in the absence of potentially confounding remodeling...
May 14, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29754916/accuracy-of-device-landing-zone-calcium-volume-measurement-with-contrast-enhanced-multidetector-computed-tomography
#5
Won-Keun Kim, Matthias Renker, Andreas Rolf, Christoph Liebetrau, Arnaud Van Linden, Mani Arsalan, Mirko Doss, Julian Rieck, Maksymilian P Opolski, Helge Möllmann, Thomas Walther, Christian W Hamm
BACKGROUND: The extent of aortic valve calcification is an important determinant of procedural success in transcatheter aortic valve implantation (TAVI). We sought to validate device landing zone calcium volume (DLZ-CV) measurements on contrast-enhanced multidetector computed tomography (MDCT) with non-contrast-enhanced scans as reference. METHODS: We determined DLZ-CV in 141 patients undergoing transfemoral TAVI. Non-contrast-enhanced images were analyzed using a threshold of 130 HU as reference (DLZ-CV130 )...
July 15, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29737316/perioperative-complications-of-sleeve-gastrectomy-review-of-the-literature
#6
REVIEW
Antonio Iannelli, Patrick Treacy, Lionel Sebastianelli, Luigi Schiavo, Francesco Martini
Sleeve gastrectomy (SG) has known a spectacular rise worldwide during the last decade. The absence of digestive anastomosis simplifies the surgical technique, reducing anastomosis-related complications such as fistula, stricture and marginal ulcer. Furthermore, the respect for digestive continuity preserves the functions of pylorus, that regulates gastric emptying, and duodenum, where calcium, B vitamins and iron are absorbed. Despite the multiple advantages, SG also has specific complications such as bleeding, stenosis, portal thrombosis and leak...
May 4, 2018: Journal of Minimal Access Surgery
https://www.readbyqxmd.com/read/29703782/adipose-and-skeletal-muscle-thermogenesis-studies-from-large-animals
#7
REVIEW
John-Paul Fuller-Jackson, Belinda A Henry
The balance between energy intake and energy expenditure establishes and preserves a 'set-point' body weight. The latter is comprised of three major components including metabolic rate, physical activity and thermogenesis. Thermogenesis is defined as the cellular dissipation of energy via heat production. This process has been extensively characterised in brown adipose tissue (BAT), wherein uncoupling protein 1 (UCP1) creates a proton leak across the inner mitochondrial membrane, diverting protons away from ATP synthesis and resulting in heat dissipation...
June 2018: Journal of Endocrinology
https://www.readbyqxmd.com/read/29593014/ryanodine-receptor-calcium-leak-in-circulating-b-lymphocytes-as-a-biomarker-in-heart-failure
#8
Alexander Kushnir, Gaetano Santulli, Steven R Reiken, Ellie Coromilas, Sarah J Godfrey, Danielle L Brunjes, Paolo C Colombo, Melana Yuzefpolskaya, Seth I Sokol, Richard N Kitsis, Andrew R Marks
Background -Advances in congestive heart failure (CHF) management depend on biomarkers for monitoring disease progression and therapeutic response. During systole, intracellular Ca2+ is released from the sarcoplasmic reticulum (SR) into the cytoplasm through type 2 ryanodine receptor/Ca2+ release channels (RyR2). In CHF, chronically elevated circulating catecholamine levels cause pathologic remodeling of RyR2 resulting in diastolic SR Ca2+ leak, and decreased myocardial contractility. Similarly, skeletal muscle contraction requires SR Ca2+ release through type-1 ryanodine receptors (RyR1), and chronically elevated catecholamine levels in CHF cause RyR1 mediated SR Ca2+ leak, contributing to myopathy and weakness...
March 28, 2018: Circulation
https://www.readbyqxmd.com/read/29525825/calcium-mishandling-impairs-contraction-in-right-ventricular-hypertrophy-prior-to-overt-heart-failure
#9
Amelia S Power, Anthony J Hickey, David J Crossman, Denis S Loiselle, Marie-Louise Ward
Currently, there are no tailored therapies available for the treatment of right ventricular (RV) hypertrophy, and the cellular mechanisms that underlie the disease are poorly understood. We investigated the cellular changes that occur early in the progression of the disease, when RV hypertrophy is evident, but prior to the onset of heart failure. Intracellular Ca2+ ([Ca2+ ]i ) handling was examined in a rat model of monocrotaline (MCT)-induced pulmonary hypertension and subsequent RV hypertrophy. [Ca2+ ]i and stress production were measured in isolated RV trabeculae under baseline conditions (1-Hz stimulation, 1...
March 10, 2018: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/29471538/novel-roles-of-ascorbate-in-plants-induction-of-cytosolic-ca2-signals-and-efflux-from-cells-via-anion-channels
#10
M Makavitskaya, D Svistunenko, I Navaselsky, P Hryvusevich, V Mackievic, C Rabadanova, E Tyutereva, V Samokhina, D Straltsova, A Sokolik, O Voitsekhovskaja, V Demidchik
Ascorbate is not often considered as a signalling molecule in plants. This study demonstrates that, in Arabidopsis roots, exogenous L-ascorbic acid triggers a transient increase of the cytosolic free calcium activity ([Ca2+]cyt.) that is central to plant signalling. Exogenous copper and iron stimulates the ascorbate-induced [Ca2+]cyt. elevation while cation channel blockers, free radical scavengers, low extracellular [Ca2+], transition metal chelators and removal of the cell wall inhibit this reaction. These data show that apoplastic redox-active transition metals are involved in the ascorbate-induced [Ca2+]cyt...
February 17, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29467165/improving-the-characterization-of-calcium-channel-gating-pore-currents-with-stac3
#11
Mohamed Chahine
No abstract text is available yet for this article.
February 21, 2018: Journal of General Physiology
https://www.readbyqxmd.com/read/29402588/talk-1-reduces-delta-cell-endoplasmic-reticulum-and-cytoplasmic-calcium-levels-limiting-somatostatin-secretion
#12
Nicholas C Vierra, Matthew T Dickerson, Kelli L Jordan, Prasanna K Dadi, Ketaki A Kadare, Molly K Altman, Sarah C Milian, David A Jacobson
OBJECTIVE: Single-cell RNA sequencing studies have revealed that the type-2 diabetes associated two-pore domain K+ (K2P) channel TALK-1 is abundantly expressed in somatostatin-secreting δ-cells. However, a physiological role for TALK-1 in δ-cells remains unknown. We previously determined that in β-cells, K+ flux through endoplasmic reticulum (ER)-localized TALK-1 channels enhances ER Ca2+ leak, modulating Ca2+ handling and insulin secretion. As glucose amplification of islet somatostatin release relies on Ca2+ -induced Ca2+ release (CICR) from the δ-cell ER, we investigated whether TALK-1 modulates δ-cell Ca2+ handling and somatostatin secretion...
March 2018: Molecular Metabolism
https://www.readbyqxmd.com/read/29397174/short-communication-test-of-the-relationship-between-prepartum-milk-leakage-and-blood-calcium-concentration-in-holstein-cows-an-observational-study
#13
Ehsan Mahjoubi, Davood Zahmatkesh, Mehdi Hossein-Yazdi, Mohammad Hadi Khabbazan, Mohammad Reza Samadian
Prepartum milk leakage happens in some pregnant dairy cows close to calving. It has been hypothesized that low blood Ca is a cause of this event. To investigate the possible reason(s) of milk leakage, 137 multiparous pregnant Holstein cows were enrolled in the experiment and categorized by the presence (72 cows; leak group) or lack (65 cows; control group) of milk leakage before calving. The concentrations of Ca and P and the length of the teat were measured for all cows. Data showed that Ca concentration was not different between cows in the leak group (7...
April 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29395910/tmc-proteins-modulate-egg-laying-and-membrane-excitability-through-a-background-leak-conductance-in-c-elegans
#14
Xiaomin Yue, Jian Zhao, Xiao Li, Yuedan Fan, Duo Duan, Xiaoyan Zhang, Wenjuan Zou, Yi Sheng, Ting Zhang, Qian Yang, Jianhong Luo, Shumin Duan, Rui Xiao, Lijun Kang
Membrane excitability is a fundamentally important feature for all excitable cells including both neurons and muscle cells. However, the background depolarizing conductances in excitable cells, especially in muscle cells, are not well characterized. Although mutations in transmembrane channel-like (TMC) proteins TMC1 and TMC2 cause deafness and vestibular defects in mammals, their precise action modes are elusive. Here, we discover that both TMC-1 and TMC-2 are required for normal egg laying in C. elegans...
February 7, 2018: Neuron
https://www.readbyqxmd.com/read/29306187/the-ellagitannin-het-induces-electrolyte-leakage-calcium-influx-and-the-accumulation-of-nitric-oxide-and-hydrogen-peroxide-in-strawberry
#15
Gustavo Gabriel Martos, Alicia Mamaní, María Paula Filippone, Atilio Pedro Castagnaro, Juan Carlos Díaz Ricci
HeT (1-0-galloyl-2,3; 4,6-bis-hexahydroxydiphenoyl-β-D-glucopyranose) is a penta-esterified ellagitannin obtained from strawberry leaves. Previous studies have shown that foliar application of HeT prior to inoculation with a virulent pathogen increases the resistance toward Colletotrichum acutatum in strawberry plants and to Xanthomonas citri subsp. citri in lemon plants. In this work we report that HeT induces an immediate leak of electrolytes, the hyperpolarization of the cellular membrane, a rapid Ca2+ influx to the cytoplasm during the first few seconds, which in turn modulates the accumulation of nitric oxide 5 min after treatment...
February 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29289652/cellular-mechanisms-of-metabolic-syndrome-related-atrial-decompensation-in-a-rat-model-of-hfpef
#16
Felix Hohendanner, David Bode, Uwe Primessnig, Tim Guthof, Rafael Doerr, Sarah Jeuthe, Sophie Reimers, Kun Zhang, Doris Bach, Paulina Wakula, Burkert M Pieske, Frank R Heinzel
Heart failure (HF) with preserved ejection fraction (HFpEF) is present in about 50% of HF patients. Atrial remodeling is common in HFpEF and associated with increased mortality. We postulate that atrial remodeling is associated with atrial dysfunction in vivo related to alterations in cardiomyocyte Calcium (Ca) signaling and remodeling. We examined atrial function in vivo and Ca transients (CaT) (Fluo4-AM, field stim) in atrial cardiomyocytes of ZSF-1 rats without (Ln; lean hypertensive) and with metabolic syndrome (Ob; obese, hypertensive, diabetic) and HFpEF...
February 2018: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/29229425/dynamic-analysis-on-the-calcium-oscillation-model-considering-the-influences-of-mitochondria
#17
Xiang Li, Suxia Zhang, Xijun Liu, Xiaojing Wang, Anqi Zhou, Peng Liu
Based on the model considering the influences of mitochondria, a further theoretical study on the dynamic behaviors of calcium signals is made. First of all, the reason for the generation and disappearance of calcium oscillations is verified in theory. Second, an analysis on the model considering the influences of mitochondria and the model neglecting the influences of mitochondria is carried out. Third, β (representing calcium leak) is introduced and it can be found that with the increase of β, the Hopf bifurcation points of system move towards the decreasing direction of μ (representing stimulus intensity) and calcium oscillations region gradually decreases...
January 2018: Bio Systems
https://www.readbyqxmd.com/read/29175952/modulation-of-ether-%C3%A3-go-go-related-gene-erg-current-governs-intrinsic-persistent-activity-in-rodent-neocortical-pyramidal-cells
#18
Edward D Cui, Ben W Strowbridge
While cholinergic receptor activation has long been known to dramatically enhance the excitability of cortical neurons, the cellular mechanisms responsible for this effect are not well understood. We used intracellular recordings in rat (both sexes) neocortical brain slices to assess the ionic mechanisms supporting persistent firing modes triggered by depolarizing stimuli following cholinergic receptor activation. We found multiple lines of evidence suggesting that a component of the underlying hyperexcitability associated with persistent firing reflects a reduction in the standing (leak) K+ current mediated by Ether-a-go-go-Related Gene (ERG) channels...
January 10, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29163222/an-update-on-sec61-channel-functions-mechanisms-and-related-diseases
#19
REVIEW
Sven Lang, Stefan Pfeffer, Po-Hsien Lee, Adolfo Cavalié, Volkhard Helms, Friedrich Förster, Richard Zimmermann
The membrane of the endoplasmic reticulum (ER) of nucleated human cells harbors the protein translocon, which facilitates membrane integration or translocation of almost every newly synthesized polypeptide targeted to organelles of the endo- and exocytotic pathway. The translocon comprises the polypeptide-conducting Sec61 channel and several additional proteins and complexes that are permanently or transiently associated with the heterotrimeric Sec61 complex. This ensemble of proteins facilitates ER targeting of precursor polypeptides, modification of precursor polypeptides in transit through the Sec61 complex, and Sec61 channel gating, i...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29142063/first-person-arijita-ghosh
#20
(no author information available yet)
First Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Arijita Ghosh is the first author on "Leucine-rich repeat-containing 8B protein is associated with the endoplasmic reticulum Ca(2+) leak in HEK293 cells", published in Journal of Cell Science. Arijita is a PhD student in the laboratory of Amal Kanti Bera at the Indian Institute of Technology Madras, Chennai, India, investigating the role of leucine-rich repeat-containing 8 proteins in cellular calcium homeostasis...
November 15, 2017: Journal of Cell Science
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