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Ventricular hypertrophy

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https://www.readbyqxmd.com/read/28822966/inhibitory-actions-of-the-nrg-1-erbb4-pathway-in-macrophages-during-tissue-fibrosis-in-heart-skin-and-lung
#1
Zarha Vermeulen, Anne-Sophie Hervent, Lindsey Dugaucquier, Leni Vandekerckhove, Miche Rombouts, Matthias Beyens, Dorien M Schrijvers, Guido R Y De Meyer, Stuart Maudsley, Gilles W De Keulenaer, Vincent Fm Segers
The neuregulin-1 (NRG-1)/ErbB system is an endothelium-controlled paracrine system modulating cardiac performance and adaptation. Recent studies indicate that NRG-1 has anti-fibrotic effects in the left ventricle (LV), which were explained by direct actions on cardiac fibroblasts. However, the NRG-1/ErbB system also regulates the function of macrophages. In this study, we hypothesized that the anti-fibrotic effect of NRG-1 in the heart is at least partially mediated through inhibitory effects on macrophages...
August 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28822962/glucose-transporter-4-glut4-deficient-hearts-develop-maladaptive-hypertrophy-in-response-to-physiologic-or-pathologic-stresses
#2
Adam Raymond Wende, Jaetaek Kim, William Holland, Benjamin E Wayment, Brian T O'Neill, Joseph Tuinei, Manoja K Brahma, Mark E Pepin, Mark A McCrory, Ivan Luptak, Ganesh V Halade, Sheldon E Litwin, E Dale Abel
Pathological cardiac hypertrophy may be associated with reduced expression of the GLUT4 glucose transporter in contrast to exercise-induced cardiac hypertrophy, where GLUT4 levels are increased. However, mice with cardiac specific deletion of GLUT4 (G4H-/-) have normal cardiac function in the unstressed state. This study tested the hypothesis that cardiac GLUT4 is required for myocardial adaptations to hemodynamic demands. G4H-/- and control littermates (Con) were subjected to either a pathological model of left ventricular pressure overload (transverse aortic constriction; TAC) or a physiological model of endurance exercise (swim training)...
August 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28822805/mg53-is-dispensable-for-t-tubule-maturation-but-critical-for-maintaining-t-tubule-integrity-following-cardiac-stress
#3
Caimei Zhang, Biyi Chen, Yihui Wang, Ang Guo, Yiqun Tang, Tahsin Khataei, Yun Shi, William J Kutschke, Kathy Zimmerman, Robert M Weiss, Jie Liu, Christopher J Benson, Jiang Hong, Jianjie Ma, Long-Sheng Song
The cardiac transverse (T)-tubule membrane system is the safeguard for cardiac function and undergoes dramatic remodeling in response to cardiac stress. However, the mechanism by which cardiomyocytes repair damaged T-tubule network remains unclear. In the present study, we tested the hypothesis that MG53, a muscle-specific membrane repair protein, antagonizes T-tubule damage to protect against maladaptive remodeling and thereby loss of excitation-contraction coupling and cardiac function. Using MG53-knockout (MG53-KO) mice, we first established that deficiency of MG53 had no impact on maturation of the T-tubule network in developing hearts...
August 16, 2017: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/28819685/cardiomyocyte-dimethylarginine-dimethylaminohydrolase-1-ddah1-plays-an-important-role-in-attenuating-ventricular-hypertrophy-and-dysfunction
#4
Xin Xu, Ping Zhang, Dongmin Kwak, John Fassett, Wenhui Yue, Dorothee Atzler, Xinli Hu, Xiaohong Liu, Huan Wang, Zhongbing Lu, Haipeng Guo, Edzard Schwedhelm, Rainer H Böger, Peijie Chen, Yingjie Chen
Asymmetric dimethylarginine (ADMA) is an endogenous inhibitor of nitric oxide synthases that limits nitric oxide bioavailability. Dimethylarginine dimethylaminohydrolase-1 (DDAH1) exerts a critical role for ADMA degradation and plays an important role in NO signaling. In the heart, DDAH1 is observed in endothelial cells and in the sarcolemma of cardiomyocytes. While NO signaling is important for cardiac adaptation to stress, DDAH1 impact on cardiomyocyte homeostasis is not clear. Here we used the MerCreMer-LoxP model to specifically disrupt cardiomyocyte DDAH1 expression in adult mice to determine the physiological impact of cardiomyocyte DDAH1 under basal conditions and during hypertrophic stress imposed by transverse aortic constriction (TAC)...
August 17, 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28819266/amalaki-rasayana-a-traditional-indian-drug-enhances-cardiac-mitochondrial-and-contractile-functions-and-improves-cardiac-function-in-rats-with-hypertrophy
#5
Vikas Kumar, Kumar A Aneesh, K Kshemada, Kumar G S Ajith, Raj S S Binil, Neha Deora, G Sanjay, A Jaleel, T S Muraleedharan, E M Anandan, R S Mony, M S Valiathan, Kumar T R Santhosh, C C Kartha
We evaluated the cardioprotective effect of Amalaki Rasayana (AR), a rejuvenating Ayurvedic drug prepared from Phyllanthus emblica fruits in the reversal of remodeling changes in pressure overload left ventricular cardiac hypertrophy (LVH) and age-associated cardiac dysfunction in male Wistar rats. Six groups (aging groups) of 3 months old animals were given either AR or ghee and honey (GH) orally; seventh group was untreated. Ascending aorta was constricted using titanium clips in 3 months old rats (N = 24; AC groups) and after 6 months, AR or GH was given for further 12 months to two groups; one group was untreated...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28817241/association-between-vitamin-d-deficiency-and-heart-failure-risk-in-the-elderly
#6
Catarina Magalhães Porto, Vanessa De Lima Silva, João Soares Brito da Luz, Brivaldo Markman Filho, Vera Magalhães da Silveira
AIMS: The aim of this study was to evaluate the association between vitamin D deficiency and risk of heart failure in elderly patients of cardiology outpatient clinics. METHODS AND RESULTS: A cross-sectional study with an analytical approach was employed. Clinical data were collected from the elderly from August 2015 to February 2016. The dependent variable was the risk of heart failure; the independent variable was vitamin D deficiency; and intervening factors were age, gender, education, ethnicity, hypertension, diabetes mellitus, hypothyroidism, renal failure, dementia, stroke, dyslipidaemia, depression, smoking, alcoholism, obesity, andropause, and cardiac arrhythmia...
August 17, 2017: ESC Heart Failure
https://www.readbyqxmd.com/read/28809956/natural-reversal-of-pulmonary-vascular-remodeling-and-right-ventricular-remodeling-in-su5416-hypoxia-treated-sprague-dawley-rats
#7
Makhosazane Zungu-Edmondson, Nataliia V Shults, Oleksiy Melnyk, Yuichiro J Suzuki
AIMS: Pulmonary arterial hypertension (PAH) is a lethal disease and improved therapeutic strategies are needed. Increased pulmonary arterial pressure, due to vasoconstriction and vascular remodeling, causes right ventricle (RV) failure and death in patients. The treatment of Sprague-Dawley rats with SU5416 injection and exposure to chronic hypoxia for three weeks followed by maintenance in normoxia promote progressive and severe PAH with pathologic features that resemble human PAH. At 5-17 weeks after the SU5416 injection, PAH is developed with pulmonary vascular remodeling as well as RV hypertrophy and fibrosis...
2017: PloS One
https://www.readbyqxmd.com/read/28808223/metastasis-associated-protein-1-deficiency-results-in-compromised-pulmonary-alveolar-capillary-angiogenesis-in-mice
#8
Jun-Hui Qin, Zhen-Yu Ke, Qiang Zhou, Li Wang, Yuan Liang, Ying-Mei Wang, Tong Yang, Xing Gao, Jing Ye, Rekesh Kumar, Rui-An Wang
BACKGROUND The aim of this study was to investigate the effects of metastasis-associated protein 1 (MTA1) deficiency during angiogenesis of pulmonary alveolar capillaries in mice and to determine the molecular mechanisms involved. MATERIAL AND METHODS The expressions of MTA1, CD34, vascular endothelial growth factor (VEGF), alpha smooth muscle actin (α-SMA), and HIF-1α were analyzed in the lungs of MTA1-knockout (KO) and wild-type mice at embryonic day 18.5 and 2 months by quantitative PCR, immunoblotting, and immunohistochemistry...
August 15, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28805979/effects-of-mtor-inhibition-on-cardiac-and-adipose-tissue-pathology-and-glucose-metabolism-in-rats-with-metabolic-syndrome
#9
Ayako Uchinaka, Mamoru Yoneda, Yuichiro Yamada, Toyoaki Murohara, Kohzo Nagata
The mammalian target of rapamycin (mTOR) is a regulator of metabolism and is implicated in pathological conditions such as obesity and diabetes. We aimed to investigate the role of mTOR in obesity. A new animal model of metabolic syndrome (MetS), named DahlS.Z-Lepr(fa) /Lepr(fa) (DS/obese) rats was established previously in our laboratory. In this study, we used this model to evaluate the effects of mTOR inhibition on cardiac and adipose tissue pathology and glucose metabolism. DS/obese rats were treated with the mTOR inhibitor, everolimus, (0...
August 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/28804970/arrhythmogenic-gene-remodelling-in-elderly-patients-with-type-2-diabetes-with-aortic-stenosis-and-normal-left-ventricular-ejection-fraction
#10
R Ashrafi, P Modi, A Y Oo, D M Pullan, K Jian, H Zhang, J Yanni Gerges, G Hart, M R Boyett, G K Davis, J P H Wilding
Type 2 diabetes is associated with higher rate of ventricular arrhythmias and this is hypothesised to be independent of coronary artery disease or hypertension. To investigate further we compared changes in left ventricular myocardial gene expression in Type 2 diabetes to patients in a control group with left ventricular hypertrophy. 9 control patients and 7 patients with type 2 diabetes with aortic stenosis undergoing aortic valve replacement had standard ECGs, signal averaged ECGs and echocardiograms prior to surgery...
August 14, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28804814/factors-associated-with-cardiovascular-target-organ-damage-in-children-after-renal-transplantation
#11
Bianca Borchert-Mörlins, Daniela Thurn, Bernhard M W Schmidt, Anja K Büscher, Jun Oh, Tanja Kier, Elena Bauer, Sabrina Baig, Nele Kanzelmeyer, Markus J Kemper, Rainer Büscher, Anette Melk
BACKGROUND: Cardiovascular disease is the second-most common cause of death in pediatric renal transplant recipients. The aim of this study was to evaluate subclinical cardiovascular target organ damage defined as the presence of arterio- and atherosclerotic lesions and cardiac remodeling and to analyze contributing risk factors in a large cohort of children after renal transplantation (RT). METHODS: A total of 109 children aged 13.1 ± 3.3 years who had undergone RT at one of three German transplant centers were enrolled in this study...
August 13, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28803927/clinical-implications-of-the-limited-relationship-of-voltage-criteria-for-electrocardiogram-left-ventricular-hypertrophy-to-cardiovascular-mortality
#12
Le Dung Ha, Ayman Elbadawi, Victor F Froelicher
BACKGROUND: Numerous methods have been proposed for diagnosing left ventricular hypertrophy using the electrocardiogram. They have limited sensitivity for recognizing pathological hypertrophy at least in part due to their inability to distinguish pathological from physiological hypertrophy. Our objective is to compare the major electrocardiogram - left ventricular hypertrophy criteria using cardiovascular mortality as a surrogate for pathological hypertrophy. METHODS: This study was a retrospective analysis of 16,253 Veterans less than 56 years of age seen at a large Veteran's Affairs Medical Center from 1987 to 1999 and followed a median of 17...
August 10, 2017: American Journal of Medicine
https://www.readbyqxmd.com/read/28803513/mechanisms-of-unexpected-death-and-autopsy-findings-in-friedreich-ataxia
#13
Roger W Byard, John D Gilbert
A 36-year-old woman with a clinical history of Friedreich ataxia and hypertrophic cardiomyopathy was found unexpectedly dead at her home. The heart showed asymmetric left ventricular hypertrophy, with an interventricular septal thickness of 20-25 mm (the remainder of the left ventricular wall measured 15 mm). Histologically, both ventricles had irregular areas of marked myocyte hypertrophy with associated interstitial fibrosis and focal myofibre disarray. There was neuronal loss within the dentate nucleus of the cerebellum, with vacuolation and axonal loss in the dorsal columns and spinocerebellar tracts of the upper cervical spinal cord...
January 1, 2017: Medicine, Science, and the Law
https://www.readbyqxmd.com/read/28803209/20-hydroxyecdysone-attenuates-cardiac-remodeling-in-spontaneously-hypertensive-rats
#14
Sukanya Phungphong, Anusak Kijtawornrat, Sirinut Chaiduang, Vitoon Saengsirisuwan, Tepmanas Bupha-Intr
BACKGROUND: Ecdysteroids, a group of steroid hormones found in insects and many plants, have been shown to prevent various changes in mammalian tissues after female sex hormone deprivation. PURPOSE: To examine whether an ecdysteroid, 20-hydroxyecdysone (20-HE), exhibits regulatory or protective roles in the cardiovascular system. STUDY DESIGN/METHOD: Blood pressure and cardiac function were evaluated in spontaneously hypertensive rats (SHR) during and after daily treatment with 20-HE for six weeks...
August 9, 2017: Steroids
https://www.readbyqxmd.com/read/28802734/adding-markers-of-organ-damage-to-risk-score-models-improves-cardiovascular-risk-assessment-prospective-analysis-of-a-large-cohort-of-adult-outpatients
#15
Giuliano Tocci, Ilaria Figliuzzi, Vivianne Presta, Nadia Attalla El Halabieh, Barbara Citoni, Roberta Coluccia, Allegra Battistoni, Andrea Ferrucci, Massimo Volpe
INTRODUCTION: Global cardiovascular (CV) risk stratification is recommended in all outpatients. Risk score charts, however, do not include markers of organ damage (OD). AIM: To evaluate the potential added value of including different markers of subclinical OD to US Framingham, European SCORE and Italian Cuore risk score calculators. METHODS: We prospectively evaluated adult outpatients, who underwent blood pressure (BP) assessment and global CV risk stratification...
July 25, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28802508/prognostic-significance-of-left-ventricular-fibrosis-in-patients-with-congenital-bicuspid-aortic-valve
#16
Gentian Lluri, Pierangelo Renella, J Paul Finn, Gabriel Vorobiof, Jamil Aboulhosn, Arjun Deb
This study sought to evaluate the prognostic value of left ventricular (LV) fibrosis assessed by late gadolinium enhancement (LGE) of the myocardium during cardiac magnetic resonance (CMR) imaging in patients with bicuspid aortic valve (BAV), which is associated with early aortic valve fibrosis and calcification. To what degree the LV myocardial wall is affected by fibrosis and its prognostic value is currently unknown. This is a retrospective, single-center study evaluating all adult patients with BAV who had CMR and followed from March 2002 to March 2016...
July 14, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28802249/high-resolution-mapping-of-chromatin-conformation-in-cardiac-myocytes-reveals-structural-remodeling-of-the-epigenome-in-heart-failure
#17
Manuel Rosa-Garrido, Douglas J Chapski, Anthony D Schmitt, Todd H Kimball, Elaheh Karbassi, Emma Monte, Enrique Balderas, Matteo Pellegrini, Tsai-Ting Shih, Elizabeth Soehalim, David A Liem, Peipei Ping, Niels J Galjart, Shuxun Ren, Yibin Wang, Bing Ren, Thomas M Vondriska
Background -Cardiovascular disease is associated with epigenomic changes in the heart, however the endogenous structure of cardiac myocyte chromatin has never been determined. Methods -To investigate the mechanisms of epigenomic function in the heart, genome-wide chromatin conformation capture (Hi-C) and DNA sequencing were performed in adult cardiac myocytes following development of pressure overload-induced hypertrophy. Mice with cardiac-specific deletion of CTCF (a ubiquitous chromatin structural protein) were generated to explore the role of this protein in chromatin structure and cardiac phenotype...
August 11, 2017: Circulation
https://www.readbyqxmd.com/read/28801894/increased-apical-rotation-in-patients-with-severe-aortic-stenosis-assessed-by-three-dimensional-speckle-tracking-imaging
#18
Maidar Tumenbayar, Kazuto Yamaguchi, Hiroyuki Yoshitomi, Akihiro Endo, Kazuaki Tanabe
BACKGROUND: Two-dimensional (2D) speckle tracking imaging (STI) is a non-invasive method used to assess subtle changes in left ventricular (LV) function such as strain and rotational dynamics. However, 2D methodology is complicated by issues such as the out-of-plane problem inherent in short-axis imaging. In addition, circumferential rotation contributes to three-dimensional (3D) wall deformations and affects tracking accuracy. By using 3D-STI technique, we evaluated LV global longitudinal strain (GLS) and apical rotation in severe aortic stenosis (AS) patients with preserved LV ejection fraction (EF)...
August 11, 2017: Journal of Echocardiography
https://www.readbyqxmd.com/read/28801758/prkag2-mutations-presenting-in-infancy
#19
Rachel D Torok, Stephanie L Austin, Chanika Phornphutkul, Kathleen M Rotondo, Deeksha Bali, Gregory H Tatum, Stephanie B Wechsler, Anne F Buckley, Priya S Kishnani
PRKAG2 encodes the γ2 subunit of AMP-activated protein kinase (AMPK), which is an important regulator of cardiac metabolism. Mutations in PRKAG2 cause a cardiac syndrome comprising ventricular hypertrophy, pre-excitation, and progressive conduction-system disease, which is typically not diagnosed until adolescence or young adulthood. However, significant variability exists in the presentation and outcomes of patients with PRKAG2 mutations, with presentation in infancy being underrecognized. The diagnosis of PRKAG2 can be challenging in infants, and we describe our experience with three patients who were initially suspected to have Pompe disease yet ultimately diagnosed with mutations in PRKAG2...
August 11, 2017: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/28799247/the-valosin-containing-protein-is-a-novel-repressor-of-cardiomyocyte-hypertrophy-induced-by-pressure-overload
#20
Ning Zhou, Ben Ma, Shaunrick Stoll, Tristan T Hays, Hongyu Qiu
Hypertension-induced left ventricular hypertrophy (LVH) is an independent risk factor for heart failure. Regression of LVH has emerged as a major goal in the treatment of hypertensive patients. Here, we tested our hypothesis that the valosin-containing protein (VCP), an ATPase associate protein, is a novel repressor of cardiomyocyte hypertrophy under the pressure overload stress. Left ventricular hypertrophy (LVH) was determined by echocardiography in 4-month male spontaneously hypertensive rats (SHRs) vs. age-matched normotensive Wistar Kyoto (WKY) rats...
August 11, 2017: Aging Cell
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