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https://www.readbyqxmd.com/read/29133341/the-trafficking-protein-ehd2-positively-regulates-cardiac-sarcolemmal-katp-channel-surface-expression-role-in-cardioprotection
#1
Hua Qian Yang, Kundan Jana, Michael J Rindler, William A Coetzee
ATP-sensitive K(+) (KATP) channels uniquely link cellular energy metabolism to membrane excitability and are expressed in diverse cell types that range from the endocrine pancreas to neurons and smooth, skeletal, and cardiac muscle. A decrease in the surface expression of KATP channels has been linked to various disorders, including dysregulated insulin secretion, abnormal blood pressure, and impaired resistance to cardiac injury. In contrast, up-regulation of KATP channel surface expression may be protective, for example, by mediating the beneficial effect of ischemic preconditioning...
November 13, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29128504/biophysical-comparison-of-sodium-currents-in-native-cardiac-myocytes-and-human-induced-pluripotent-stem-cell-derived-cardiomyocytes
#2
Robert J Goodrow, Suveer Desai, Jacqueline A Treat, Brian K Panama, Mayurika Desai, Vladislav V Nesterenko, Jonathan M Cordeiro
INTRODUCTION: Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are used for safety pharmacology and to investigate genetic diseases affecting cardiac ion channels. It is unclear whether adult myocytes or hiPSC-CMs are the better platform for cardiac safety pharmacology. We examined the biophysical and molecular properties of INa in adult myocytes and hiPSC-CMs. METHODS: hiPSC-CMs were plated at low density. Atrial and ventricular cells were obtained from dog hearts...
November 8, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/29107716/pacsin-2-is-required-for-the-maintenance-of-a-normal-cardiac-function-in-the-developing-mouse-heart
#3
Judith Semmler, Jan Kormann, Sureshkumar Perumal Srinivasan, Annette Köster, Daniel Sälzer, Michael Reppel, Jürgen Hescheler, Markus Plomann, Filomain Nguemo
The Pacsin proteins (Pacsin 1, 2 and 3) play an important role in intracellular trafficking and thereby signal transduction in many cells types. This study was designed to examine the role of Pacsin 2 in cardiac development and function. We investigated the development and electrophysiological properties of Pacsin 2 knockout (P2KO) hearts and single cardiomyocytes isolated from 11.5 and 15.5days old fetal mice. Immunofluorescence experiments confirmed the lack of Pacsin 2 protein expression in P2KO cardiac myocytes in comparison to wildtype (WT)...
October 28, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29104199/-surgical-treatment-for-myocardial-rerupture-after-repair-of-post-infarction-left-ventricular-free-wall-rupture
#4
Chikashi Aoki, Kengo Tani, Ryou Taguchi, Ryousuke Kowatari, Norihiro Kondo, Masahito Minakawa, Ikuo Fukuda
A 73-year-old man was admitted for cardiac tamponade by oozing type left ventricular free wall rupture associated with acute myocardial infarction. Transthoracic echocardiography demonstrated moderate pericardial effusion and the presence of pseudoaneurysm within posterior wall. He went into shock with a systolic blood pressure of 60 mmHg. After introducing percutaneous cardiopulmonary support and intraaortic balloon pump, the sutureless repair was performed immediately. After having rehabilitation for right-sided hemiparesis, an elective pseudoaneurysm repair was planned...
November 2017: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/29097701/two-missense-mutations-in-kcnq1-cause-pituitary-hormone-deficiency-and-maternally-inherited-gingival-fibromatosis
#5
Johanna Tommiska, Johanna Känsäkoski, Lasse Skibsbye, Kirsi Vaaralahti, Xiaonan Liu, Emily J Lodge, Chuyi Tang, Lei Yuan, Rainer Fagerholm, Jørgen K Kanters, Päivi Lahermo, Mari Kaunisto, Riikka Keski-Filppula, Sanna Vuoristo, Kristiina Pulli, Tapani Ebeling, Leena Valanne, Eeva-Marja Sankila, Sirpa Kivirikko, Mitja Lääperi, Filippo Casoni, Paolo Giacobini, Franziska Phan-Hug, Tal Buki, Manuel Tena-Sempere, Nelly Pitteloud, Riitta Veijola, Marita Lipsanen-Nyman, Kari Kaunisto, Patrice Mollard, Cynthia L Andoniadou, Joel A Hirsch, Markku Varjosalo, Thomas Jespersen, Taneli Raivio
Familial growth hormone deficiency provides an opportunity to identify new genetic causes of short stature. Here we combine linkage analysis with whole-genome resequencing in patients with growth hormone deficiency and maternally inherited gingival fibromatosis. We report that patients from three unrelated families harbor either of two missense mutations, c.347G>T p.(Arg116Leu) or c.1106C>T p.(Pro369Leu), in KCNQ1, a gene previously implicated in the long QT interval syndrome. Kcnq1 is expressed in hypothalamic GHRH neurons and pituitary somatotropes...
November 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/29096598/cost-effectiveness-analysis-of-sealing-hemostat-patches-vs-standard-of-care-in-cardiac-surgery
#6
Shelly Ikeme, Luca Weltert, Kevin M Lewis, Gerhard Bothma, Daniela Cianciulli, Nicole Pay, Josh Epstein, Erik Kuntze
BACKGROUND: A recent randomized controlled trial showed that patients undergoing ascending aorta surgery treated with HEMOPATCH to control bleeding had a significantly better hemostasis success rate than with dry or wet gauze compression or similar standard of care (SOC). OBJECTIVE: To compare the cost effectiveness using two different agents for hemostasis (HEMOPATCH versus dry or wet gauze compression or similar SOC) in cardiac surgery from the European hospital perspective...
November 3, 2017: Journal of Medical Economics
https://www.readbyqxmd.com/read/29078233/comparing-the-host-reaction-to-cormatrix-and-different-cardiac-patch-materials-implanted-subcutaneously-in-growing-pigs
#7
Zahra Mosala Nezhad, Alain Poncelet, Caroline Fervaille, Pierre Gianello
No abstract text is available yet for this article.
October 27, 2017: Thoracic and Cardiovascular Surgeon
https://www.readbyqxmd.com/read/29076304/review-of-the-emerging-role-of-optical-polarimetry-in-characterization-of-pathological-myocardium
#8
Iftikhar Ahmad
Myocardial infarction (MI), a cause of significant morbidity and mortality, is typically followed by microstructural alterations where the necrotic myocardium is steadily replaced with a collagen scar. Engineered remodeling of the fibrotic scar via stem cell regeneration has been shown to improve/restore the myocardium function after MI. Nevertheless, the heterogeneous nature of the scar patch may impair the myocardial electrical integrity, leading to the formation of arrhythmogenesis. Radiofrequency ablation (RFA) offers an effective treatment for focal arrhythmias where local heating generated via electric current at specific spots in the myocardium ablate the arrhythmogenic foci...
October 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29072259/barbaloin-inhibits-ventricular-arrhythmias-in-rabbits-by-modulating-voltage-gated-ion-channels
#9
Zhen-Zhen Cao, You-Jia Tian, Jie Hao, Pei-Hua Zhang, Zhi-Pei Liu, Wan-Zhen Jiang, Meng-Liu Zeng, Pei-Pei Zhang, Ji-Hua Ma
Barbaloin (10-β-D-glucopyranosyl-1,8-dihydroxy-3-(hydroxymethyl)-9(10H)-anthracenone) is extracted from the aloe plant and has been reported to have anti-inflammatory, antitumor, antibacterial, and other biological activities. Here, we investigated the effects of barbaloin on cardiac electrophysiology, which has not been reported thus far. Cardiac action potentials (APs) and ionic currents were recorded in isolated rabbit ventricular myocytes using whole-cell patch-clamp technique. Additionally, the antiarrhythmic effect of barbaloin was examined in Langendorff-perfused rabbit hearts...
October 26, 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/29062050/functional-expression-and-pharmaceutical-efficacy-of-cardiac-specific-ion-channels-in-human-embryonic-stem-cell-derived-cardiomyocytes
#10
Han Sol Kim, Jung Won Yoon, Hongliang Li, Geun Ok Jeong, Jin Ju Park, Sung Eun Shin, Il Ho Jang, Jae Ho Kim, Won Sun Park
Cardiomyocytes differentiated from human pluripotent stem cells provide promising tools for screening of cardiotoxic drugs. For evaluation of human pluripotent stem cell-derived cardiomyocytes for cardiotoxicity test, in the present study, human embryonic stem cells (hESCs) were differentiated to cardiomyocytes, followed by metabolic selection to enrich the differentiated cardiomyocytes. The highly purified hESC-derived cardiomyocytes (hESC-CMs) expressed several cardiomyocyte-specific markers including cTnT, MLC2a, and α-SA, but not pluripotency markers, such as OCT4 and NANOG...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29058194/characterization-of-mc4r-regulation-of-the-kir7-1-channel-using-the-tl-flux-assay
#11
Michael J Litt, Roger D Cone, Masoud Ghamari-Langroudi
The family of inward rectifying potassium channels (Kir channels) plays crucial roles in the regulation of heart rhythms, renal excretion, insulin release, and neuronal activity. Their dysfunction has been attributed to numerous diseases such as cardiac arrhythmia, kidney failure and electrolyte imbalance, diabetes mellitus, epilepsy, retinal degeneration, and other neuronal disorders. We have recently demonstrated that the melanocortin-4 receptor (MC4R), a Gαs-coupled GPCR, regulates Kir7.1 activity through a mechanism independent of Gαs and cAMP...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29057770/iatrogenic-aortic-valve-perforation-after-ventricular-septal-defect-repair
#12
Chonglei Ren, Shengli Jiang, Mingyan Wang, Yao Wang, Changqing Gao
Iatrogenic aortic valve (AV) perforation during non-aortic cardiac operations is a rare complication. The suture-related inadvertent injury to an AV leaflet can produce leaflet perforation with aortic regurgitation after ventricular septal defect repair (VSDR). We report three consecutive patients who had iatrogenic aortic leaflet perforation during VSDR in other hospitals and referred to our hospital for reoperation. In all three cases, the perforated AV leaflets were preserved and repaired by autologous pericardial patch or direct local closure...
October 20, 2017: Annals of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29055952/aloe-emodin-relieves-high-fat-diet-induced-qt-prolongation-via-mir-1-inhibition-and-ik1-up-regulation-in-rats
#13
Yan Bai, Zhenli Su, Hanqi Sun, Wei Zhao, Xue Chen, Pengzhou Hang, Wenliang Zhu, Zhimin Du
BACKGROUND/AIMS: High-fat diet (HFD) causes cardiac electrical remodeling and increases the risk of ventricular arrhythmias. Aloe-emodin (AE) is an anthraquinone component isolated from rhubarb and has a similar chemical structure with emodin. The protective effect of emodin against cardiac diseases has been reported in the literature. However, the cardioprotective property of AE is still unknown. The present study investigated the effect of AE on HFD-induced QT prolongation in rats. METHODS: Adult male Wistar rats were randomly divided into three groups: control, HFD, and AE-treatment groups...
October 20, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29050815/right-ventricular-outflow-tract-reintervention-after-primary-tetralogy-of-fallot-repair-in-neonates-and-young-infants
#14
Shyamasundar Balasubramanya, David Zurakowski, Michele Borisuk, Aditya K Kaza, Sitaram M Emani, Pedro J Del Nido, Christopher W Baird
OBJECTIVE: To assess the outcomes following primary tetralogy of Fallot (TOF) repair in neonates and young infants with pulmonary stenosis (PS) and pulmonary atresia and compare differences in reintervention on the right ventricular outflow tract (RVOT) among those undergoing valve sparing repair (VSR), transannular RVOT patch (TAP), and right ventricle-to-pulmonary artery (RV-PA) conduit surgeries. METHODS: Data were collected retrospectively in 101 patients who underwent TOF repair over a 10-year period between January 2005 and September 2015...
September 19, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/29050528/uv-assisted-3d-bioprinting-of-nano-reinforced-hybrid-cardiac-patch-for-myocardial-tissue-engineering
#15
Mohammad Izadifar, Dean Chapman, Paul Babyn, Xiongbiao Chen, Michael E Kelly
Biofabrication of cell supportive cardiac patches that can be directly implanted on myocardial infarct is a potential solution for myocardial infarction repair. Ideally, cardiac patches should be able to mimic myocardium extracellular matrix for rapid integration with the host tissue, raising the need to develop cardiac constructs with complex features. In particular, cardiac patches should be electrically conductive, mechanically robust and elastic, biologically active and pre-vascularized.. In this study, we aim to biofabricate a nano-reinforced hybrid cardiac patch laden with human coronary artery endothelial cells (HCAECs) with improved electrical, mechanical and biological behavior...
October 19, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/29042254/cardiac-sodium-channel-antagonism-translation-of-preclinical-in-vitro-assays-to-clinical-qrs-prolongation
#16
Stephen Jenkinson, Asser Bassyouni, Jason Cordes, Bernard Fermini, Donglin Guo, David M Potter, David S Ramirez, Jill Steidl-Nichols, Sunny Sun, Todd Wisialowski
INTRODUCTION: Cardiac sodium channel antagonists have historically been used to treat cardiac arrhythmias by preventing the reentry of the electrical impulse that could occur following myocardial damage. However, clinical studies have highlighted a significant increase in mortality associated with such treatment. Cardiac sodium channel antagonist activity is now seen as an off-target pharmacology that should be mitigated during the drug development process. The aim of this study was to examine the correlation between in vitro/ex vivo assays that are routinely used to measure Nav1...
October 16, 2017: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/29037885/national-trends-and-outcomes-of-cardiac-arrest-in-opioid-overdose
#17
Ankit Sakhuja, Matthew Sztajnkrycer, Saraschandra Vallabhajosyula, Wisit Cheungpasitporn, Richard Patch, Jacob Jentzer
AIM: To investigate the epidemiology and outcomes of cardiac arrests associated with opioid overdoses. Recent data suggest that drug overdoses are responsible for more deaths than motor vehicle crashes or firearms in the United States each year, with opioids being involved in majority of drug overdose deaths. Despite the potential for opioids to cause cardiac arrest, few studies have examined this association. PATIENTS AND METHODS: Using data from National (Nationwide) Inpatient Sample database from years 2000-2013, we identified hospitalizations with drug overdoses using ICD-9-CM codes...
October 14, 2017: Resuscitation
https://www.readbyqxmd.com/read/29037258/transplantation-of-isl1-cardiac-progenitor-cells-in-small-intestinal-submucosa-improves-infarcted-heart-function
#18
Lingjun Wang, Elizabeth M Meier, Shuo Tian, Ienglam Lei, Liu Liu, Shaoxiang Xian, Mai T Lam, Zhong Wang
BACKGROUND: Application of cardiac stem cells combined with biomaterial scaffold is a promising therapeutic strategy for heart repair after myocardial infarction. However, the optimal cell types and biomaterials remain elusive. METHODS: In this study, we seeded Isl1(+) embryonic cardiac progenitor cells (CPCs) into decellularized porcine small intestinal submucosa extracellular matrix (SIS-ECM) to assess the therapeutic potential of Isl1(+) CPCs and the biocompatibility of SIS-ECM with these cells...
October 16, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29037217/subtype-specific-differentiation-of-cardiac-pacemaker-cell-clusters-from-human-induced-pluripotent-stem-cells
#19
Patrick A Schweizer, Fabrice F Darche, Nina D Ullrich, Pascal Geschwill, Boris Greber, Rasmus Rivinius, Claudia Seyler, Karin Müller-Decker, Andreas Draguhn, Jochen Utikal, Michael Koenen, Hugo A Katus, Dierk Thomas
BACKGROUND: Human induced pluripotent stem cells (hiPSC) harbor the potential to differentiate into diverse cardiac cell types. Previous experimental efforts were primarily directed at the generation of hiPSC-derived cells with ventricular cardiomyocyte characteristics. Aiming at a straightforward approach for pacemaker cell modeling and replacement, we sought to selectively differentiate cells with nodal-type properties. METHODS: hiPSC were differentiated into spontaneously beating clusters by co-culturing with visceral endoderm-like cells in a serum-free medium...
October 16, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29037055/computer-aided-diagnosis-sensor-integrated-outdoor-shirts-for-real-time-heart-disease-monitoring
#20
Ji-Ae Park, Hee-Jeong Han, Jin-Chul Heo, Jong-Ha Lee
The typical method of monitoring arrhythmia is to use a body patch type sensor with a wet electrode. It has several problems caused by wet electrodes for long-term monitoring. Thus, a monitoring sensor integrated into clothes with a dry electrode is proposed. In this study, we develop a smart outdoor shirt equipped with a dry electrode electrocardiogram (ECG) sensor for a cardiac arrhythmia computer aided diagnosis system. The sensor can be inserted in a console close to the chest, charged, used to communicate wirelessly, and connected with a smartphone application...
October 16, 2017: Computer Assisted Surgery (Abingdon, England)
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