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("ryanodine receptor" OR "ryr" OR "ryr2") AND ("heart" OR "cardiac")

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https://www.readbyqxmd.com/read/28337264/ip3r-and-ryr-calcium-channels-are-involved-in-neonatal-rat-cardiac-myocyte-hypertrophy-induced-by-tumor-necrosis-factor-%C3%AE
#1
Gui-Jun Wang, Lian-Yi Guo, Hong-Xin Wang, Yu-Sheng Yao
To investigate which calcium channels are involved in cardiac myocyte hypertrophy induced by TNF-α, cultured cardiomyocytes were treated with 100 μg/L TNF-α. In addition, three different calcium channel blockers (2-APB, ryanodine and nifedipine) were used, and the effects of each calcium channel blocker on cardiac hypertrophy induced by TNF-α were carefully observed. Measurements included cytosolic calcium transients ([Ca(2+)]i), the level of intracellular calcium in individual cells, cell protein content, cell protein synthesis and cell volume...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28332202/calcium-signalling-silencing-in-atrial-fibrillation
#2
Maura Greiser
Sub-cellular calcium signalling silencing is a novel and distinct cellular and molecular adaptive response to rapid cardiac activation. Calcium signalling silencing develops during short-term sustained rapid atrial activation as seen clinically during paroxysmal atrial fibrillation (AF). It is the first 'anti-arrhythmic' adaptive response in the setting of AF and appears to counteract the maladaptive changes that lead to intracellular Ca(2+) signalling instability and Ca(2+) based arrhythmogenicity. Calcium signalling silencing results in a failed propagation of the [Ca(2+) ]i signal to the myocyte centre in both patients with AF and in a rabbit model...
March 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28316073/arrhythmic-effects-of-epac-mediated-ryanodine-receptor-activation-in-langendorff-perfused-murine-hearts-are-associated-with-reduced-conduction-velocity
#3
Mengye Li, Sandeep Hothi, Samantha C Salvage, Kamalan Jeevaratnam, Andrew A Grace, Christopher L-H Huang
Recent papers have attributed arrhythmic substrate in murine RyR2-P2328S hearts to reduced action potential (AP) conduction velocities (CV), reflecting acute functional inhibition and/or reduced expression of sodium channels. We explored for acute effects of direct Epac (exchange protein directly activated by cAMP)-mediated ryanodine receptor-2 (RyR2) activation on arrhythmic substrate and CV. Monophasic action potential recordings demonstrated that initial steady (8-Hz) extrinsic pacing elicited ventricular tachycardia (VT) in 0 of 18 Langendorff-perfused wild-type mouse ventricles before pharmacological intervention...
March 18, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28303572/intracellular-calcium-release-channels-an-update
#4
Gaetano Santulli, Ryutaro Nakashima, Qi Yuan, Andrew R Marks
Ryanodine receptors (RyRs) and inositol 1,4,5-trisphosphate receptors (IP3Rs) are calcium (Ca(2+) ) release channels on the endo/sarcoplasmic reticulum (ER/SR). Here we summarize the latest advances in the field, describing the recently discovered mechanistic roles of intracellular Ca(2+) release channels in the regulation of mitochondrial fitness and endothelial function, providing novel therapeutic options for the treatment of heart failure, hypertension, and diabetes mellitus. This article is protected by copyright...
March 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28242257/exendin-4-inhibits-structural-remodeling-and-improves-ca-2-homeostasis-in-rats-with-heart-failure-via-the-glp-1-receptor-through-the-enos-cgmp-pkg-pathway
#5
Jingjing Chen, Dandan Wang, Fangai Wang, Shaobo Shi, Yuting Chen, Bo Yang, Yanhong Tang, Congxin Huang
The glucagon-like peptide-1 receptor (GLP-1R) agonist exendin-4 is a long-acting analog of GLP-1, which stimulates insulin secretion and is clinically used in the treatment of type 2 diabetes. Previous studies have demonstrated that GLP-1 agonists and analogs serve as cardioprotective factors in various conditions. Disturbances in calcium cycling are characteristic of heart failure (HF); therefore, the aim of this study was to investigate the effect of exendin-4 (a GLP-1 mimetic) on the regulation of calcium handling and to identify the underlying mechanisms in an HF rat model after myocardial infarction (MI)...
February 24, 2017: Peptides
https://www.readbyqxmd.com/read/28237968/nationwide-experience-of-catecholaminergic-polymorphic-ventricular-tachycardia-caused-by-ryr2-mutations
#6
Anders Krogh Broendberg, Jens Cosedis Nielsen, Jesper Bjerre, Lisbeth Noerum Pedersen, Jens Kristensen, Finn Lund Henriksen, Henning Bundgaard, Henrik Kjaerulf Jensen
OBJECTIVE: The aim of this study was to characterise disease penetrance, course of disease and use of antiarrhythmic medication and implantable cardioverter-defibrillator (ICD) therapy in a Danish nationwide cohort of patients with catecholaminergic polymorphic ventricular tachycardia (CPVT) due to mutations in the ryanodine receptor-2 (RyR2) gene. METHODS: The study population was identified through the national hereditary heart disease database (Progeny). The study population was divided into three groups: probands, symptomatic and asymptomatic relatives...
February 25, 2017: Heart: Official Journal of the British Cardiac Society
https://www.readbyqxmd.com/read/28216082/semi-automated-program-for-analysis-of-local-ca-2-spark-release-with-application-for-classification-of-heart-cell-type
#7
Moran Davoodi, Sofia Segal, Noa Kirschner Peretz, David Kamoun, Yael Yaniv
Local Ca(2+) spark releases are essential to the Ca(2+) cycling process. Thus, they play an important role in ventricular and atrial cell contraction, as well as in sinoatrial cell automaticity. Characterizing their properties in healthy cells from different regions in the heart can reveal the basic biophysical differences among these regions. We designed a semi-automatic Matlab Graphical User Interface (called Sparkalyzer) to characterize parameters of Ca(2+) spark release from any major cardiac tissue, as recorded in line-scan mode with a confocal laser-scanning microscope...
February 9, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28209766/glycosylated-chromogranin-a-in-heart-failure-implications-for-processing-and-cardiomyocyte-calcium-homeostasis
#8
Anett Hellebø Ottesen, Cathrine R Carlson, William E Louch, Mai Britt Dahl, Ragnhild A Sandbu, Rune Forstrøm Johansen, Hilde Jarstadmarken, Magnar Bjørås, Arne Didrik Høiseth, Jon Brynildsen, Ivar Sjaastad, Mats Stridsberg, Torbjørn Omland, Geir Christensen, Helge Røsjø
BACKGROUND: Chromogranin A (CgA) levels have previously been found to predict mortality in heart failure (HF), but currently no information is available regarding CgA processing in HF and whether the CgA fragment catestatin (CST) may directly influence cardiomyocyte function. METHODS AND RESULTS: CgA processing was characterized in postinfarction HF mice and in patients with acute HF, and the functional role of CST was explored in experimental models. Myocardial biopsies from HF, but not sham-operated mice, demonstrated high molecular weight CgA bands...
February 2017: Circulation. Heart Failure
https://www.readbyqxmd.com/read/28202948/identification-of-pathogenic-variants-in-genes-related-to-channelopathy-and-cardiomyopathy-in-korean-sudden-cardiac-arrest-survivors
#9
Ju Sun Song, Jong-Sun Kang, Young-Eun Kim, Seung-Jung Park, Kyoung-Min Park, June Huh, June Soo Kim, Hana Cho, Chang-Seok Ki, Young Keun On
Pathogenic variants in genes related to channelopathy and cardiomyopathy are the most common cause of sudden unexplained cardiac death. However, few reports have investigated the frequency and/or spectrum of pathogenic variants in these genes in Korean sudden cardiac arrest survivors. This study aimed to investigate the causative genetic variants of cardiac-associated genes in Korean sudden cardiac arrest survivors. We performed exome sequencing followed by filtering and validation of variants in 100 genes related to channelopathy and cardiomyopathy in 19 Korean patients who survived sudden cardiac arrest...
February 16, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28181690/calcium-mediated-cellular-triggered-activity-in-atrial-fibrillation
#10
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/28179209/administration-of-anabolic-steroid-during-adolescence-induces-long-term-cardiac-hypertrophy-and-increases-susceptibility-to-ischemia-reperfusion-injury-in-adult-wistar-rats
#11
Fernando de Azevedo Cruz Seara, Raiana Andrade Quintanilha Barbosa, Dahienne Ferreira de Oliveira, Diorney Luiz Souza Gran da Silva, Adriana Bastos Carvalho, Andrea Claudia Freitas Ferreira, José Hamilton Matheus Nascimento, Emerson Lopes Olivares
Chronic administration of anabolic androgenic steroids (AAS) in adult rats results in cardiac hypertrophy and increased susceptibility to myocardial ischemia/reperfusion (IR) injury. Molecular analyses demonstrated that hyperactivation of type 1 angiotensin II (AT1) receptor mediates cardiac hypertrophy induced by AAS and also induces down-regulation of myocardial ATP-sensitive potassium channel (KATP), resulting in loss of exercise-induced cardioprotection. Exposure to AAS during adolescence promoted long-term cardiovascular dysfunctions, such as dysautonomia...
February 5, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28169003/increased-calcium-leak-associated-with-reduced-calsequestrin-expression-in-hyperthyroid-cardiomyocytes
#12
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/28164397/four-main-active-ingredients-derived-from-a-traditional-chinese-medicine-guanxin-shutong-capsule-cause-cardioprotection-during-myocardial-ischemia-injury-calcium-overload-suppression
#13
Feng Liu, Zhuang-Zhuang Huang, Yu-Hong Sun, Ting Li, Dong-Hua Yang, Gang Xu, Ying-Ying Su, Tao Zhang
Guanxin Shutong capsule is a traditional Chinese medicine for the treatment of myocardial ischemia (MI). Previous studies have shown that the formula has four main active ingredients (FMAI), protocatechuic acid, cryptotanshinone, borneol, and eugenol. However, the mechanisms of action of these FMAI against MI injury are still not well known. The aim of the present study was to evaluate the protective effects of the FMAI on MI in vitro and in vivo. In vitro, rat neonatal cardiomyocytes were isolated, the cell viability and apoptosis rate were, respectively, measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method and fluorescence activating cell sorter, and the intracellular calcium concentration ([Ca(2+) ]i ) and CaM and CaMKII δ mRNA as well as protein levels were determined...
February 6, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28131631/ryanodine-receptor-modification-and-regulation-by-intracellular-ca-2-and-mg-2-in-healthy-and-failing-human-hearts
#14
K Walweel, P Molenaar, M S Imtiaz, A Denniss, C Dos Remedios, D F van Helden, A F Dulhunty, D R Laver, N A Beard
RATIONALE: Heart failure is a multimodal disorder, of which disrupted Ca(2+) homeostasis is a hallmark. Central to Ca(2+) homeostasis is the major cardiac Ca(2+) release channel - the ryanodine receptor (RyR2) - whose activity is influenced by associated proteins, covalent modification and by Ca(2+) and Mg(2+). That RyR2 is remodelled and its function disturbed in heart failure is well recognized, but poorly understood. OBJECTIVE: To assess Ca(2+) and Mg(2+) regulation of RyR2 from left ventricles of healthy, cystic fibrosis and failing hearts, and to correlate these functional changes with RyR2 modifications and remodelling...
March 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28131630/the-effect-of-pka-mediated-phosphorylation-of-ryanodine-receptor-on-sr-ca-2-leak-in-ventricular-myocytes
#15
Elisa Bovo, Sabine Huke, Lothar A Blatter, Aleksey V Zima
Functional impact of cardiac ryanodine receptor (type 2 RyR or RyR2) phosphorylation by protein kinase A (PKA) remains highly controversial. In this study, we characterized a functional link between PKA-mediated RyR2 phosphorylation level and sarcoplasmic reticulum (SR) Ca(2+) release and leak in permeabilized rabbit ventricular myocytes. Changes in cytosolic [Ca(2+)] and intra-SR [Ca(2+)]SR were measured with Fluo-4 and Fluo-5N, respectively. Changes in RyR2 phosphorylation at two PKA sites, serine-2031 and -2809, were measured with phospho-specific antibodies...
March 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28126160/role-of-nod1-in-heart-failure-progression-via-regulation-of-ca-2-handling
#16
Almudena Val-Blasco, María Jose G M Piedras, Gema Ruiz-Hurtado, Natalia Suarez, Patricia Prieto, Silvia Gonzalez-Ramos, Nieves Gómez-Hurtado, Carmen Delgado, Laetitia Pereira, Gemma Benito, Carlos Zaragoza, Nieves Domenech, María Generosa Crespo-Leiro, Daniel Vasquez-Echeverri, Gabriel Nuñez, Eduardo Lopez-Collazo, Lisardo Boscá, María Fernández-Velasco
BACKGROUND: Heart failure (HF) is a complex syndrome associated with a maladaptive innate immune system response that leads to deleterious cardiac remodeling. However, the underlying mechanisms of this syndrome are poorly understood. Nucleotide-binding oligomerization domain-containing protein 1 (NOD1) is a newly recognized innate immune sensor involved in cardiovascular diseases. OBJECTIVES: This study evaluated the role of NOD1 in HF progression. METHODS: NOD1 was examined in human failing myocardium and in a post-myocardial infarction (PMI) HF model evaluated in wild-type (wt-PMI) and Nod1(-/-) mice (Nod1(-/-)-PMI)...
January 31, 2017: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28111173/cardiac-expression-of-ryanodine-receptor-subtype-3-a-strategic-component-in-the-intracellular-ca-2-release-system-of-purkinje-fibers-in-large-mammalian-heart
#17
Rebecca E Daniels, Kazi T Haq, Lawson S Miller, Elizabeth W Chia, Masahito Miura, Vincenzo Sorrentino, John J McGuire, Bruno D Stuyvers
BACKGROUND: Three distinct Ca(2+) release channels were identified in dog P-cells: the ryanodine receptor subtype 2 (RyR2) was detected throughout the cell, while the ryanodine receptor subtype 3 (RyR3) and inositol phosphate sensitive Ca(2+) release channel (InsP3R) were found in the cell periphery. How each of these channels contributes to the Ca(2+) cycling of P-cells is unclear. Recent modeling of Ca(2+) mobilization in P-cells suggested that Ca(2+) sensitivity of Ca(2+)induced Ca(2+)release (CICR) was larger at the P-cell periphery...
January 20, 2017: Journal of Molecular and Cellular Cardiology
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/28100344/-recurrent-syncope-related-to-catecholaminergic-polymorphic-ventricular-tachycardia-due-to-de-novo-ryr2-r2401h-mutation
#19
X Liu, J X Li, J Z Hu, Y Shen, R Wan, Q M Xiong, Q Q Zhou, J Y Xie, J J Jin, X Yan, J H Yu, K Hong
Objective: To explore the clinical and molecular genetic features of a Chinese patient with catecholaminergic polymorphic ventricular tachycardia (CPVT). Methods: Clinical data including resting electrocardiography, echocardiography and treadmill exercise testing of a patient with CPVT admitted to our department in March 2013 were analyzed, and the peripheral venous blood samples of the patient and his family members and 400 ethnicity-matched healthy controls were obtained. All exons and exon-intron boundaries of the six CPVT-related genes including RYR2, CASQ2, TRDN, CALM1, KCNJ2 and ANKB were sequenced to detect the variants related to CPVT...
January 25, 2017: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/28096415/increased-mitochondrial-nanotunneling-activity-induced-by-calcium-imbalance-affects-intermitochondrial-matrix-exchanges
#20
Manuela Lavorato, V Ramesh Iyer, Williams Dewight, Ryan R Cupo, Valentina Debattisti, Ludovic Gomez, Sergio De la Fuente, Yan-Ting Zhao, Héctor H Valdivia, György Hajnóczky, Clara Franzini-Armstrong
Exchanges of matrix contents are essential to the maintenance of mitochondria. Cardiac mitochondrial exchange matrix content in two ways: by direct contact with neighboring mitochondria and over longer distances. The latter mode is supported by thin tubular protrusions, called nanotunnels, that contact other mitochondria at relatively long distances. Here, we report that cardiac myocytes of heterozygous mice carrying a catecholaminergic polymorphic ventricular tachycardia-linked RyR2 mutation (A4860G) show a unique and unusual mitochondrial response: a significantly increased frequency of nanotunnel extensions...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
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