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cardiomyocyte and metabolism

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https://www.readbyqxmd.com/read/27907040/the-role-of-reactive-oxygen-species-in-%C3%AE-adrenergic-signaling-in-cardiomyocytes-from-mice-with-the-metabolic-syndrome
#1
Monica Llano-Diez, Jon Sinclair, Takashi Yamada, Mei Zong, Jeremy Fauconnier, Shi-Jin Zhang, Abram Katz, Kent Jardemark, Håkan Westerblad, Daniel C Andersson, Johanna T Lanner
The metabolic syndrome is associated with prolonged stress and hyperactivity of the sympathetic nervous system and afflicted subjects are prone to develop cardiovascular disease. Under normal conditions, the cardiomyocyte response to acute β-adrenergic stimulation partly depends on increased production of reactive oxygen species (ROS). Here we investigated the interplay between beta-adrenergic signaling, ROS and cardiac contractility using freshly isolated cardiomyocytes and whole hearts from two mouse models with the metabolic syndrome (high-fat diet and ob/ob mice)...
2016: PloS One
https://www.readbyqxmd.com/read/27903587/changes-in-mitochondrial-morphology-and-organisation-can-enhance-energy-supply-from-mitochondrial-oxidative-phosphorylation-in-diabetic-cardiomyopathy
#2
Jan Jarosz, Shouryadipta Ghosh, Lea M D Delbridge, Amorita Volschenk, Anthony Jr Hickey, Edmund J Crampin, Eric Hanssen, Vijay Rajagopal
Diabetic cardiomyopathy is accompanied by metabolic and ultrastructural alterations, but the impact of the structural changes on metabolism itself is yet to be determined. Morphometric analysis of mitochondrial shape and spatial organisation within transverse sections of cardiomyocytes from control and streptozotocin induced type I diabetic Sprague-Dawley rats revealed that mitochondria are 20% smaller in size while their spatial density increases by 53% in diabetic cells relative to control myocytes. Diabetic cells formed larger clusters of mitochondria (60% more mitochondria per cluster) and the effective surface to volume ratio of these clusters increased by 22...
November 30, 2016: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/27899891/cardiac-stat3-deficiency-impairs-contractility-and-metabolic-homeostasis-in-hypertension
#3
Raffaele Altara, Romain Harmancey, Sean P Didion, George W Booz, Fouad A Zouein
Signal transducer and activator of transcription 3 (STAT3) protects the heart from acute ischemic stress. However, the importance of STAT3 to the heart in chronic stress, such as hypertension, is not known. To study this, we used cardiomyocyte-targeted STAT3 knockout (KO) mice and Angiotensin II (ANG II) infusion by osmotic minipumps. After 4 weeks, ANG II induced similar cardiac hypertrophy in wild type (WT) and cardiac Cre-expressing control (CTRL) mice with no impairment of cardiac function. In contrast, STAT3 KO mice exhibited reduced contractile function but similar hypertrophy to CTRL mice...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27899860/leptin-attenuates-the-contractile-function-of-adult-rat-cardiomyocytes-involved-in-oxidative-stress-and-autophagy
#4
Liu-Jin Luo, Ying-Ping Liu, Xun Yuan, Gui-Ping Zhang, Ning Hou, Xiao-Qian Wu, Jian-Dong Luo, Gen-Shui Zhang
BACKGROUND: Leptin has been identified as an important protein involved in obesity. As a chronic metabolic disorder, obesity is associated with a high risk of developing cardiovascular and metabolic diseases, including heart failure. The aim of this paper was to investigate the effects and the mechanism of leptin on the contractile function of cardiomyocytes in the adult rat. METHODS: Isolated adult rat cardiomyocytes were exposed to leptin (1, 10, and 100 nmol/L) for 1 hour...
November 2016: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/27897970/an-essential-cell-autonomous-role-for-hepcidin-in-cardiac-iron-homeostasis
#5
Samira Lakhal-Littleton, Magda Wolna, Yu Jin Chung, Helen C Christian, Lisa C Heather, Marcella Brescia, Vicky Ball, Rebeca Diaz, Ana Santos, Daniel Biggs, Kieran Clarke, Benjamin Davies, Peter A Robbins
Hepcidin is the master regulator of systemic iron homeostasis. Derived primarily from the liver, it inhibits the iron exporter ferroportin in the gut and spleen, the sites of iron absorption and recycling respectively. Recently, we demonstrated that ferroportin is also found in cardiomyocytes, and that its cardiac-specific deletion leads to fatal cardiac iron overload. Hepcidin is also expressed in cardiomyocytes, where its function remains unknown. To define the function of cardiomyocyte hepcidin, we generated mice with cardiomyocyte-specific deletion of hepcidin, or knock-in of hepcidin-resistant ferroportin...
November 29, 2016: ELife
https://www.readbyqxmd.com/read/27890729/maturation-of-human-embryonic-stem-cell-derived-cardiomyocytes-hesc-cms-in-3d-collagen-matrix-effects-of-niche-cell-supplementation-and-mechanical-stimulation
#6
W Zhang, C W Kong, M H Tong, W H Chooi, N Huang, R A Li, B P Chan
: Cardiomyocytes derived from human embryonic stem cells (hESC-CMs) are regarded as a promising source for regenerative medicine, drug testing and disease modeling. Nevertheless, cardiomyocytes are immature in terms of their contractile structure, metabolism and electrophysiological properties. Here, we fabricate cardiac muscle strips by encapsulating hESC-CMs in collagen-based biomaterials. Supplementation of niche cells at 3% to the number of hESC-CMs enhance the maturation of the hESC-CMs in 3D tissue matrix...
November 24, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27882934/macrophage-dependent-il-1%C3%AE-production-induces-cardiac-arrhythmias-in-diabetic-mice
#7
Gustavo Monnerat, Micaela L Alarcón, Luiz R Vasconcellos, Camila Hochman-Mendez, Guilherme Brasil, Rosana A Bassani, Oscar Casis, Daniela Malan, Leonardo H Travassos, Marisa Sepúlveda, Juan Ignacio Burgos, Martin Vila-Petroff, Fabiano F Dutra, Marcelo T Bozza, Claudia N Paiva, Adriana Bastos Carvalho, Adriana Bonomo, Bernd K Fleischmann, Antonio Carlos Campos de Carvalho, Emiliano Medei
Diabetes mellitus (DM) encompasses a multitude of secondary disorders, including heart disease. One of the most frequent and potentially life threatening disorders of DM-induced heart disease is ventricular tachycardia (VT). Here we show that toll-like receptor 2 (TLR2) and NLRP3 inflammasome activation in cardiac macrophages mediate the production of IL-1β in DM mice. IL-1β causes prolongation of the action potential duration, induces a decrease in potassium current and an increase in calcium sparks in cardiomyocytes, which are changes that underlie arrhythmia propensity...
November 24, 2016: Nature Communications
https://www.readbyqxmd.com/read/27882330/aldh2-inhibition-potentiates-high-glucose-stress-induced-injury-in-cultured-cardiomyocytes
#8
Guodong Pan, Mandar Deshpande, Rajarajan A Thandavarayan, Suresh Selvaraj Palaniyandi
Aldehyde dehydrogenase (ALDH) gene superfamily consists of 19 isozymes. They are present in various organs and involved in metabolizing aldehydes that are biologically generated. For instance, ALDH2, a cardiac mitochondrial ALDH isozyme, is known to detoxify 4-hydroxy-2-nonenal, a reactive aldehyde produced upon lipid peroxidation in diabetic conditions. We hypothesized that inhibition of ALDH leads to the accumulation of unmetabolized 4HNE and consequently exacerbates injury in cells subjected to high glucose stress...
2016: Journal of Diabetes Research
https://www.readbyqxmd.com/read/27881388/hyperglycemia-induces-defective-ca2-homeostasis-in-cardiomyocytes
#9
Andrea Sorrentino, Giulia Borghetti, Yu Zhou, Antonio Cannata, Marianna Meo, Sergio Signore, Piero Anversa, Annarosa Leri, Polina Goichberg, Khaled Qanud, Jason T Jacobson, Thomas H Hintze, Marcello Rota
Diabetes and other metabolic conditions characterized by elevated blood glucose constitute important risk factors for cardiovascular disease. Hyperglycemia targets myocardial cells rendering ineffective mechanical properties of the heart, but cellular alterations dictating the progressive deterioration of cardiac function with metabolic disorders remain to be clarified. In the current study, we examined the effects of hyperglycemia on cardiac function and myocyte physiology by employing mice with high blood glucose induced by administration of streptozotocin, a compound toxic to insulin-producing β-cells...
November 23, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27880725/mouse-sirt3-promotes-autophagy-in-angii-induced-myocardial-hypertrophy-through-the-deacetylation-of-foxo1
#10
Jingyuan Li, Tongshuai Chen, Ming Xiao, Na Li, Shujian Wang, Hongyan Su, Xiaobin Guo, Hui Liu, Fangying Yan, Yi Yang, Yun Zhang, Peili Bu
Sirt3, a mitochondrial NAD+-dependent histone deacetylase, is the only member proven to promote longevity in mammalian Sirtuin family. The processed short form of Sirt3 has been demonstrated to target many mediators of energy metabolism and mitochondrial stress adaptive program. Autophagy serves as a dynamic recycling mechanism and provides energy or metabolic substrates. Among the mechanisms triggered by cardiac stress, opinions vary as to whether autophagy is a protective or detrimental response. Here, by inducing the Sirt3-knockout mice to myocardial hypertrophy with chronic angiotensin II infusion for four weeks, we determined the role of Sirt3 in myocardial hypertrophy and autophagy...
November 17, 2016: Oncotarget
https://www.readbyqxmd.com/read/27879401/diabetic-cardiomyopathy-the-case-for-a-role-of-fructose-in-disease-etiology
#11
Lea M D Delbridge, Vicky L Benson, Rebecca H Ritchie, Kimberley M Mellor
A link between excess dietary sugar and cardiac disease is clearly evident and has been largely attributed to systemic metabolic dysregulation. Now a new paradigm is emerging, and a compelling case can be made that fructose-associated heart injury may be attributed to the direct actions of fructose on cardiomyocytes. Plasma and cardiac fructose levels are elevated in patients with diabetes, and evidence suggests that some unique properties of fructose (vs. glucose) have specific cardiomyocyte consequences. Investigations to date have demonstrated that cardiomyocytes have the capacity to transport and utilize fructose and express all of the necessary proteins for fructose metabolism...
December 2016: Diabetes
https://www.readbyqxmd.com/read/27875683/redox-paradox-can-hypoxia-heal-ischemic-hearts
#12
Nuno Guimarães-Camboa, Sylvia M Evans
Adult cardiomyocytes are largely thought to lack proliferative and therefore regenerative potential. Reporting in Nature, Nakada et al. (2016) find that a hypoxic regime reduces mitochondrial metabolism and promotes proliferation in adult mouse cardiomyocytes, resulting in increased regeneration following myocardial infarction. These findings suggest the potential to transform post-MI care.
November 21, 2016: Developmental Cell
https://www.readbyqxmd.com/read/27872154/genetic-determinants-of-myocardial-dysfunction
#13
REVIEW
Xianchi Li, Peiying Zhang
Heart failure (HF) is a major killer with high morbidity and mortality and nearly 37.7 million people are affected by HF globally, making this a global epidemic. HF is a complex pathophysiological syndrome in which the mechanical function of heart for pumping blood is compromised. Cardiac structural and functional abnormalities culminate in decreased cardiac output along with increased intracardiac pressures under resting or stress conditions, leading to HF. Besides the acquired risk factors, the independent role of hereditary and genetic factors in the development, progression and prognosis of HF remains to be established...
November 21, 2016: Journal of Medical Genetics
https://www.readbyqxmd.com/read/27864612/secretory-products-from-epicardial-adipose-tissue-from-patients-with-type-2-diabetes-impair-mitochondrial-%C3%AE-oxidation-in-cardiomyocytes-via-activation-of-the-cardiac-renin-angiotensin-system-and-induction-of-mir-208a
#14
Marcel Blumensatt, Pia Fahlbusch, Rebecca Hilgers, Marlies Bekaert, Daniella Herzfeld de Wiza, Payam Akhyari, Johannes B Ruige, D Margriet Ouwens
Secretory products from epicardial adipose tissue (EAT) from patients with type 2 diabetes (T2D) impair cardiomyocyte function. These changes associate with alterations in miRNA expression, including the induction of miR-208a. Recent studies suggest that activation of the cardiac-specific renin-angiotensin system (RAS) may affect cardiac energy metabolism via induction of miR-208a. This study investigated whether cardiomyocyte dysfunction induced by conditioned media (CM) from EAT-T2D involves activation of the RAS/miR-208a pathway...
January 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/27854030/simple-oxygraphic-analysis-for-the-presence-of-adenylate-kinase-1-and-2-in-normal-and-tumor-cells
#15
Aleksandr Klepinin, Lyudmila Ounpuu, Rita Guzun, Vladimir Chekulayev, Natalja Timohhina, Kersti Tepp, Igor Shevchuk, Uwe Schlattner, Tuuli Kaambre
The adenylate kinase (AK) isoforms network plays an important role in the intracellular energy transfer processes, the maintenance of energy homeostasis, and it is a major player in AMP metabolic signaling circuits in some highly-differentiated cells. For this purpose, a rapid and sensitive method was developed that enables to estimate directly and semi-quantitatively the distribution between cytosolic AK1 and mitochondrial AK2 localized in the intermembrane space, both in isolated cells and tissue samples (biopsy material)...
November 17, 2016: Journal of Bioenergetics and Biomembranes
https://www.readbyqxmd.com/read/27836671/glycine-prevents-pressure-overload-induced-cardiac-hypertrophy-mediated-by-glycine-receptor
#16
Yan Lu, Xudong Zhu, Jinjie Li, Ru Fang, Zhuoyun Wang, Jing Zhang, Kexue Li, Xiaoyu Li, Hui Bai, Qing Yang, Jingjing Ben, Hanwen Zhang, Qi Chen
As a major amino acid, glycine has multiple functions in metabolism, growth, immunity, cytoprotection, and survival. The aim of this study was to determine the effects of glycine on pathologic cardiac hypertrophy and the mechanism underlying it. Pre-treatment with glycine significantly attenuated murine cardiac hypertrophy induced by transverse aortic constriction or by administration of angiotensin II (Ang II). This action was associated with a suppressive extracellular signal-regulated kinase 1/2 phosphorylation in myocardium...
November 9, 2016: Biochemical Pharmacology
https://www.readbyqxmd.com/read/27832814/obesity-induced-cardiac-lipid-accumulation-in-adult-mice-is-modulated-by-g-protein-coupled-receptor-kinase-2-levels
#17
Elisa Lucas, Rocio Vila-Bedmar, Alba C Arcones, Marta Cruces-Sande, Victoria Cachofeiro, Federico Mayor, Cristina Murga
BACKGROUND: The leading cause of death among the obese population is heart failure and stroke prompted by structural and functional changes in the heart. The molecular mechanisms that underlie obesity-related cardiac remodeling are complex, and include hemodynamic and metabolic alterations that ultimately affect the functionality of the myocardium. G protein-coupled receptor kinase 2 (GRK2) is an ubiquitous kinase able to desensitize the active form of several G protein-coupled receptors (GPCR) and is known to play an important role in cardiac GPCR modulation...
November 10, 2016: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/27825849/nuclear-receptor-retinoid-related-orphan-receptor-%C3%AE-deficiency-exacerbates-high-fat-diet-induced-cardiac-dysfunction-despite-improving-metabolic-abnormality
#18
Yi-Chao Zhao, Long-Wei Xu, Song Ding, Qing-Qi Ji, Nan Lin, Qing He, Ling-Chen Gao, Yuan-Yuan Su, Jun Pu, Ben He
Retinoid-related orphan receptor α (RORα), a member of the metabolic nuclear receptor superfamily, plays a vital regulatory role in circadian rhythm and metabolism. Here, we investigated the role of RORα in high-fat diet (HFD)-induced cardiac impairments and the underlying mechanisms involved. RORα-deficient stagger mice (sg/sg) and wild type (WT) littermates were fed with either standard diet or HFD. At 20weeks after HFD treatment, RORα deficiency resulted in significantly decreased body weight gain, improved dyslipidemia and ameliorated insulin resistance (evaluated by blood biochemical and glucose/insulin tolerance tests) compared with WT control...
November 5, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27819129/roles-of-sirt3-in-heart-failure-from-bench-to-bedside
#19
De-Xing Hu, Xian-Bao Liu, Wen-Chao Song, Jian-An Wang
Heart failure (HF) represents the most common endpoint of most cardiovascular diseases (CVDs) which are the leading causes of death around the world. Despite the advances in treating CVDs, the prevalence of HF continues to increase. It is believed that better results of prognosis are obtained from prevention rather than additional treatment for HF. Therefore, it is reasonable to prevent the development of CVDs or other complications to HF. Most types of HF are attributed to contractile dysfunction, cardiac hypertrophy or remodeling, and ischemic injuries...
2016: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/27818636/mitochondrial-quality-control-in-cardiac-diseases
#20
REVIEW
Juliane C Campos, Luiz H M Bozi, Luiz R G Bechara, Vanessa M Lima, Julio C B Ferreira
Disruption of mitochondrial homeostasis is a hallmark of cardiac diseases. Therefore, maintenance of mitochondrial integrity through different surveillance mechanisms is critical for cardiomyocyte survival. In this review, we discuss the most recent findings on the central role of mitochondrial quality control processes including regulation of mitochondrial redox balance, aldehyde metabolism, proteostasis, dynamics, and clearance in cardiac diseases, highlighting their potential as therapeutic targets.
2016: Frontiers in Physiology
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