keyword
MENU ▼
Read by QxMD icon Read
search

Calcium leak

keyword
https://www.readbyqxmd.com/read/28535962/predictors-of-paravalvular-regurgitation-after-implantation-of-the-fully-repositionable-and-retrievable-lotus-transcatheter-aortic-valve-from-the-reprise-ii-trial-extended-cohort
#1
Daniel J Blackman, Ian T Meredith, Nicolas Dumonteil, Didier Tchétché, David Hildick-Smith, Mark S Spence, Darren L Walters, Jan Harnek, Stephen G Worthley, Gilles Rioufol, Thierry Lefèvre, Vicki M Houle, Dominic J Allocco, Keith D Dawkins
Paravalvular leak (PVL) after transcatheter aortic valve replacement is associated with worse long-term outcomes. The Lotus Valve incorporates an innovative Adaptive Seal designed to minimize PVL. This analysis evaluated the incidence and predictors of PVL after implantation of the Lotus transcatheter aortic valve. The REPRISE II (REpositionable Percutaneous Replacement of Stenotic Aortic Valve through Implantation of Lotus Valve System - Evaluation of Safety and Performance) Study With Extended Cohort enrolled 250 high-surgical risk patients with severe symptomatic aortic stenosis...
April 27, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28499500/ca-2-release-channels-join-the-resolution-revolution
#2
REVIEW
Ran Zalk, Andrew R Marks
Ryanodine receptors (RyRs) are calcium release channels expressed in the sarcoendoplasmic reticula of many cell types including cardiac and skeletal muscle cells. In recent years Ca(2+) leak through RyRs has been implicated as a major contributor to the development of diseases including heart failure, muscle myopathies, Alzheimer's disease, and diabetes, making it an important therapeutic target. Recent mammalian RyR1 cryoelectron microscopy (cryo-EM) structures of multiple functional states have clarified longstanding questions including the architecture of the transmembrane (TM) pore and cytoplasmic domains, the location and architecture of the channel gate, ligand-binding sites, and the gating mechanism...
May 9, 2017: Trends in Biochemical Sciences
https://www.readbyqxmd.com/read/28497395/cardio-protective-effects-of-qishen-granule-on-sarcoplasmic-reticulum-ca-2-handling-in-heart-failure-rats
#3
Ling-Hui Lu, Chun Li, Qi-Yan Wang, Qian Zhang, Yi Zhang, Hui Meng, Yong Wang, Wei Wang
OBJECTIVES: To assess the effects of Qishen Granule (, QSG) on sarcoplasmic reticulum (SR) Ca(2+) handling in heart failure (HF) model of rats and to explore the underlying molecular mechanisms. METHODS: HF rat models were induced by left anterior descending coronary artery ligation surgery and high-fat diet feeding. Rats were randomly divided into sham (n=10), model (n=10), QSG (n=12, 2.2 g/kg daily) and metoprolol groups (n=12, 10.5 mg/kg daily). The therapeutic effects of QSG were evaluated by echocardiography and blood lipid testing...
May 11, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28369430/aortic-root-calcium-burden-and-post-transcatheter-aortic-valve-implantation-paravalvular-leak-can-t-live-without-it-can-t-live-with-it
#4
Zhen Qian, Patrizio Lancellotti, Mani A Vannan
No abstract text is available yet for this article.
June 1, 2017: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/28361997/zinc-treatment-is-efficient-against-escherichia-coli-%C3%AE-haemolysin-induced-intestinal-leakage-in-mice
#5
Stephanie Wiegand, Silke S Zakrzewski, Miriam Eichner, Emanuel Schulz, Dorothee Günzel, Robert Pieper, Rita Rosenthal, Christian Barmeyer, André Bleich, Ulrich Dobrindt, Jörg-Dieter Schulzke, Roland Bücker
Zinc homoeostasis exerts protective effects in inflammatory intestinal diseases and zinc supplementation has been successfully used for treating infectious diarrhoea. This study aimed at a characterisation of zinc effects on focal leak induction by α-haemolysin (HlyA)-producing Escherichia coli (E. coli) as protective mechanism for colitis. We conducted in vivo experiments by oral challenge of gnotobiotic mice colonised with HlyA-expressing E. coli-536. Mice were either fed a defined normal or high zinc diet to analyse effects of zinc as a therapeutic regimen...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28360100/trans-fatty-acids-promote-proinflammatory-signaling-and-cell-death-by-stimulating-the-apoptosis-signal-regulating-kinase-1-ask1-p38-pathway
#6
Yusuke Hirata, Miki Takahashi, Yuki Kudoh, Kuniyuki Kano, Hiroki Kawana, Kumiko Makide, Yasuharu Shinoda, Yasushi Yabuki, Kohji Fukunaga, Junken Aoki, Takuya Noguchi, Atsushi Matsuzawa
Food-borne trans-fatty acids (TFAs) are mainly produced as byproducts during food manufacture. Recent epidemiological studies have revealed that TFA consumption is a major risk factor for various disorders, including atherosclerosis. However, the underlying mechanisms in this disease etiology are largely unknown. Here we have shown that TFAs potentiate activation of apoptosis signal-regulating kinase 1 (ASK1) induced by extracellular ATP, a damage-associated molecular pattern leaked from injured cells. Major food-associated TFAs such as elaidic acid (EA), linoelaidic acid, and trans-vaccenic acid, but not their corresponding cis isomers, dramatically enhanced extracellular ATP-induced apoptosis, accompanied by elevated activation of the ASK1-p38 pathway in a macrophage-like cell line, RAW264...
May 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28317877/transcription-factor-nf-kappa-b-represses-ant1-transcription-and-leads-to-mitochondrial-dysfunctions
#7
Chen Zhang, Hui Jiang, Pin Wang, Heng Liu, Xiulian Sun
Mitochondria are intracellular organelles involved in cell survival and death, and dysfunctions of mitochondria are related to neurodegenerative diseases. As the most abundant protein in the mitochondrial inner membrane, adenine nucleotide translocator 1 (ANT1) plays a critical role in mitochondrial function, including the exchange of adenosine triphosphate/adenosine diphosphate (ATP/ADP) in mitochondria, basal proton leak and mitochondrial permeability transition pore (mPTP). Here, we show that ANT1 transcription is regulated by transcription factor NF-kappa B (NF-κB)...
March 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28274007/facial-dysmorphism-an-unreported-teratogenicity-with-levetiracetam
#8
Jyotsana Gupta, Sandhya Jain, Shalini Rajaram, Neerja Goel, Bindiya Gupta
Levetiracetam (LEV) is a relatively newer anticonvulsant drug used to treat epilepsy and is approved by United States Food and Drugs Administration (USFDA). The drug binds to a synaptic vesicle glycoprotein and inhibits presynaptic calcium channels, thus reducing neurotransmitter release. Commonly reported side effects include drowsiness, weakness, unsteady gait, mood changes and loss of appetite. Like most other antiepileptics, it is a Category C drug in pregnancy. We report the first case of facial dysmorphism in the neonate of a mother taking LEV antenatally...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28260211/respiratory-muscle-contractile-inactivity-induced-by-mechanical-ventilation-in-piglets-leads-to-leaky-ryanodine-receptors-and-diaphragm-weakness
#9
Stefan Matecki, Boris Jung, Nathalie Saint, Valerie Scheuermann, Samir Jaber, Alain Lacampagne
Respiratory muscle contractile inactivity during mechanical ventilation (MV) induces diaphragm muscle weakness, a condition referred to as ventilator-induced diaphragmatic dysfunction (VIDD). Although VIDD pathophysiological mechanisms are still not fully understood, it has been recently suggested that remodeling of the sarcoplasmic reticulum (SR) calcium release channel/ryanodine receptors (RyR1) in the diaphragm is a proximal mechanism of VIDD. Here, we used piglets, a large animal model of VIDD that is more relevant to human pathophysiology, to determine whether RyR1 alterations are observed in the presence of diaphragm weakness...
March 4, 2017: Journal of Muscle Research and Cell Motility
https://www.readbyqxmd.com/read/28249687/activation-of-endoplasmic-reticulum-calcium-leak-by-2-apb-depends-on-the-luminal-calcium-concentration
#10
Daniel Leon-Aparicio, Jesus Chavez-Reyes, Agustin Guerrero-Hernandez
It has been shown that 2-APB is a nonspecific modulator of ion channel activity, while most of the channels are inhibited by this compound, there are few examples of channels that are activated by 2-APB. Additionally, it has been shown that, 2-APB leads to a reduction in the luminal endoplasmic reticulum Ca(2+) level ([Ca(2+)]ER) and we have carried out simultaneous recordings of both [Ca(2+)]i and the [Ca(2+)]ER in HeLa cell suspensions to assess the mechanism involved in this effect. This approach allowed us to determine that 2-APB induces a reduction in the [Ca(2+)]ER by activating an ER-resident Ca(2+) permeable channel more than by inhibiting the activity of SERCA pumps...
February 8, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28218251/stim1-phosphorylation-at-y361-recruits-orai1-to-stim1-puncta-and-induces-ca-2-entry
#11
Pascal Yazbeck, Mohammad Tauseef, Kevin Kruse, Md-Ruhul Amin, Rayees Sheikh, Stefan Feske, Yulia Komarova, Dolly Mehta
Store-operated Ca(2+) entry (SOCE) mediates the increase in intracellular calcium (Ca(2+)) in endothelial cells (ECs) that regulates several EC functions including tissue-fluid homeostasis. Stromal-interaction molecule 1 (STIM1), upon sensing the depletion of (Ca(2+)) from the endoplasmic reticulum (ER) store, organizes as puncta that trigger store-operated Ca(2+) entry (SOCE) via plasmalemmal Ca(2+)-selective Orai1 channels. While the STIM1 and Orai1 binding interfaces have been mapped, signaling mechanisms activating STIM1 recruitment of Orai1 and STIM1-Orai1 interaction remains enigmatic...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28181690/calcium-mediated-cellular-triggered-activity-in-atrial-fibrillation
#12
Dobromir Dobrev, Xander H T Wehrens
Although atrial fibrillation (AF) is the most commonly encountered cardiac arrhythmia, the basic mechanisms underlying this disorder remain incompletely understood. During the past decade or so, it has become clear that alterations in intracellular Ca(2+) handling may play a role in the pathogenesis of AF. Studies in small and large animal models, as well as atrial samples from patients with different forms of AF have implicated ryanodine receptor type 2 (RyR2) dysfunction and enhanced spontaneous Ca(2+) release events from the sarcoplasmic reticulum (SR) as a potential cause of proarrhythmic cellular ectopic (triggered) activity in AF...
February 9, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28181072/interactions-of-mitochondria-metabolism-and-calcium-regulation-in-alzheimer-s-disease-a-calcinist-point-of-view
#13
Gary E Gibson, Ankita Thakkar
Decades of research suggest that alterations in calcium are central to the pathophysiology of Alzheimer's Disease (AD). Highly reproducible changes in calcium dynamics occur in cells from patients with both genetic and non-genetic forms of AD relative to controls. The most robust change is an exaggerated release of calcium from internal stores. Detailed analysis of these changes in animal and cell models of the AD-causing presenilin mutations reveal robust changes in ryanodine receptors, inositol tris-phosphate receptors, calcium leak channels and store activated calcium entry...
February 8, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28179072/orai3-channel-is-the-2-apb-induced-endoplasmic-reticulum-calcium-leak
#14
Daniel Leon-Aparicio, Jonathan Pacheco, Jesus Chavez-Reyes, Jose M Galindo, Jesus Valdes, Luis Vaca, Agustin Guerrero-Hernandez
We have studied in HeLa cells the molecular nature of the 2-APB induced ER Ca(2+) leak using synthetic Ca(2+) indicators that report changes in both the cytoplasmic ([Ca(2+)]i) and the luminal ER ([Ca(2+)]ER) Ca(2+) concentrations. We have tested the hypothesis that Orai channels participate in the 2-APB-induced ER Ca(2+) leak that was characterized in the companion paper. The expression of the dominant negative Orai1 E106A mutant, which has been reported to block the activity of all three types of Orai channels, inhibited the effect of 2-APB on the [Ca(2+)]ER but did not decrease the ER Ca(2+) leak after thapsigargin (TG)...
January 23, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28169003/increased-calcium-leak-associated-with-reduced-calsequestrin-expression-in-hyperthyroid-cardiomyocytes
#15
David R de Alba-Aguayo, Natalia Pavón, Martha Mercado-Morales, Miyamin Miranda-Saturnino, Mavil López-Casamichana, Agustin Guerrero-Hernández, Angelica Rueda
INTRODUCTION: Calcium (Ca(2+)) leak during cardiac diastole is chiefly mediated by intracellular Ca(2+) channel/Ryanodine Receptors. Increased diastolic Ca(2+) leak has been proposed as the mechanism underlying the appearance of hereditary arrhythmias. However, little is known about alterations in diastolic Ca(2+) leak and the specific roles played by key intracellular Ca(2+)-handling proteins in hyperthyroidism, a known arrhythmogenic condition. AIM: We sought to determine whether there were modifications in diastolic Ca(2+) leak, based on the recording of Ca(2+) sparks and Ca(2+) waves; we also investigated changes in the expression and activity of key Ca(2+) handling proteins, including ryanodine receptors, Sarco-Endoplasmic Reticulum Ca(2+) ATPase pump and calsequestrin in isolated left-ventricular cardiomyocytes isolated from hyperthyroid rats...
January 23, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28144998/p2y12-receptors-in-primary-microglia-activate-nuclear-factor-of-activated-t-cell-signaling-to-induce-c-c-chemokine-3-expression
#16
Hidetoshi Tozaki-Saitoh, Hiroyuki Miyata, Tomohiro Yamashita, Katsuyuki Matsushita, Makoto Tsuda, Kazuhide Inoue
Microglia are widely accepted as surveillants in the central nervous system that are continually searching the local environment for signs of injury. Following an inflammatory situation, microglia alter their morphology, extend ramified processes, and undergo cell body hypertrophy. Extracellular nucleotides are recognized as a danger signal by microglia. ADP acting on P2Y12 receptors induce process extension of microglia thereby attracting microglia to the site of adenosine tri-phosphate/ADP leaking or release...
January 31, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28116867/pass-the-rock-calcium-the-achilles-heel-of-transcatheter-valve-replacement
#17
EDITORIAL
James M McCabe, Larry S Dean
Increasing annular calcification portends more adverse outcomes and worse hemodynamic results following percutaneous structural heart interventions. Though the Direct Flow prosthesis did not appear to have significantly different post-procedural gradients based on aortic valve calcium burden in a selected group of patients, the average residual gradients were relatively high in all cases and the presence of a paravalvular leak was more common with increasing valvular calcification. It is unclear how the Direct Flow prosthesis fits into the armamentarium of TAVR prostheses...
January 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28105734/calcium-calmodulin-dependent-protein-kinase-mediates-the-intracellular-signaling-pathways-of-cardiac-apoptosis-in-mice-with-impaired-glucose-tolerance
#18
Marilen Federico, Enrique L Portiansky, Leandro Sommese, Francisco J Alvarado, Paula G Blanco, Carolina N Zanuzzi, John Dedman, Marcia Kaetzel, Xander H T Wehrens, Alicia Mattiazzi, Julieta Palomeque
Background The impact of cardiac apoptosis in pre-diabetic stages of diabetic cardiomyopathy is unknown. We described that myocytes from fructose-rich diet (FRD) animals exhibit arrhythmias produced by exacerbated Ca(2+) /calmodulin-protein kinase (CaMKII) activity, ryanodine receptors (RyR2) phosphorylation and sarcoplasmic reticulum (SR) Ca(2+) leak. We tested the hypothesis that this mechanism also underlies cardiac apoptosis in pre-diabetes. Methods and Results We generated a pre-diabetic model in mice fed with FRD...
January 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28077389/enhanced-oxidative-capacity-of-ground-squirrel-brain-mitochondria-during-hibernation
#19
Mallory A Ballinger, Christine Schwartz, Matthew T Andrews
During hibernation, thirteen-lined ground squirrels (Ictidomys tridecemlineatus) regularly cycle between bouts of torpor and interbout arousal (IBA). Most of the brain is electrically quiescent during torpor but regains activity quickly upon arousal to IBA, resulting in extreme oscillations in energy demand during hibernation. We predicted increased functional capacity of brain mitochondria during hibernation compared with spring to accommodate the variable energy demands of hibernation. To address this hypothesis, we examined mitochondrial bioenergetics in the ground squirrel brain across three time points: spring (SP), torpor (TOR), and IBA...
March 1, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27942915/treatment-of-hand-enchondroma-with-injectable-calcium-phosphate-cement-a-series-of-eight-cases
#20
Mohammad Al Rajeh, Juan José Hidalgo Diaz, Sybille Facca, Anne Sophie Matheron, Stéphanie Gouzou, Philippe Liverneaux
The gold standard treatment for enchondroma in the hand is curettage and filling of the defect. The goal of this study was to evaluate the results when injectable calcium phosphate cement is used to fill the bone defect. Eight patients having a mean age of 44 years were operated through a minimally invasive skin incision. After a small bone window was made, curettage of the lesion was performed and verified by intraosseous endoscopy. The defect was filled with injectable calcium phosphate cement (JectOS/AREX(®)BONE, Kasios, L'Union France)...
February 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
keyword
keyword
31768
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"