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Cardiac mechanics

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https://www.readbyqxmd.com/read/28927226/female-clock%C3%AE-19-%C3%AE-19-mice-are-protected-from-the-development-of-age-dependent-cardiomyopathy
#1
Faisal J Alibhai, Cristine J Reitz, Willem T Peppler, Poulami Basu, Paul Sheppard, Elena Choleris, Marica Bakovic, Tami A Martino
Aims: Circadian rhythms are important for healthy cardiovascular physiology and they are regulated by the molecular circadian mechanism. Previously, we showed that disruption of the circadian mechanism factor CLOCK in male Clock Δ19/Δ19 mice led to development of age-dependent cardiomyopathy. Here, we investigate the role of biological sex in protecting against heart disease in aging female Clock Δ19/Δ19 mice. Methods and results: Female Clock Δ19/Δ19 mice are protected from the development of cardiomyopathy with age, as heart structure and function are similar to 18 months of age versus female WT mice...
September 12, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28926854/telferia-occidentalis-and-vitamin-c-attenuate-phenylhydrazine-induced-haemolytic-anaemia-and-associated-cardio-renal-dysfunctions-via-inhibition-of-oxidative-stress-and-proapoptotic-protein-bax-expressions
#2
Temitayo Olabisi Ajibade, Ademola Adetokunbo Oyagbemi, Temidayo Olutayo Omobowale, Ebunoluwa Rachael Asenuga, Adebowale Bernard Saba
Background The study investigated the modulatory roles of the aqueous leaf extract of Telferia occidentalis, a traditional haematinic, and vitamin C on cardiovascular dysfunction associated with subchronic Phenylhydrazine exposure. Methods Fifty adult male rats were randomly selected and divided into one of five groups of ten animals each: Control; 40 mgkg(-1) Phenylhydrazine (PHZ); PHZ with 100 mgkg(-1) T.occidentalis; PHZ with 200 mgkg(-1) T.occidentalis; and PHZ with 100 mgkg(-1) vitamin C. Results Oral exposure of rats to PHZ, without T...
September 19, 2017: Drug Research
https://www.readbyqxmd.com/read/28925471/research-on-the-function-and-mechanism-of-survivin-in-heart-failure-mice-model
#3
L Bo, X-S Zhu, Z Zheng, X-P Hu, P-Y Chen
OBJECTIVE: To observe the role of survivin in the heart failure mice model and to study its mechanism. MATERIALS AND METHODS: 20 male C57BL/ 6J mice were selected and randomly divided into two groups: normal group (n=10) and heart failure group (n=10). After continuous modeling, the cardiac functions of mice in the two groups were detected via ultrasonic cardiogram equipment. The pathological conditions of hearts in the two groups were detected via hematoxylin and eosin (HE) staining...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28925470/effect-of-autophagy-on-myocardial-infarction-and-its-mechanism
#4
Z Aisa, G-C Liao, X-L Shen, J Chen, L Li, S-B Jiang
OBJECTIVE: To investigate the effect of autophagy on acute myocardial infarction (AMI), and its mechanism in rats. MATERIALS AND METHODS: A total of 75 Sprague Dawley (SD) rats were randomly divided into three groups (n=25): sham operation (S) group, the AMI group and rapamycin (RAPA) treatment group. The model of AMI was established and the myocardial infarction size was calculated by triphenyltetrazolium chloride (TTC) staining. Morphological changes in myocardium were observed by hematoxylin and eosin (HE) staining...
August 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28925384/size-matters-finding-growth-pathways-that-protect-the-heart
#5
J Sawalla Guseh, Anthony Rosenzweig
In a recent paper published in Cell Research, Abdul-Ghani and colleagues show that the cytokine, cardiotrophin-1 (CT1), drives a protective form of reversible cardiac hypertrophy that acts through a nonapoptotic caspase-dependent mechanism. Since CT1 can be delivered as exogenous protein, these studies provide new biological insights and potential translational opportunities.
September 19, 2017: Cell Research
https://www.readbyqxmd.com/read/28925377/applied-upper-airway-resistance-instantly-affects-breath-components-a-unique-insight-into-pulmonary-medicine
#6
Pritam Sukul, Jochen Schubert, Svend Kamysek, Phillip Trefz, Wolfram Miekisch
Respiratory parameters such as flow or rate have complex effects onto exhalation of volatile substances and can hamper clinical interpretation of breath biomarkers. We investigated effects of progressively applied upper-airway resistances onto exhalation of volatile organic compounds (VOCs) in healthy humans. We performed real-time mass-spectrometric determination of breath volatiles in 50 subjects with parallel non-invasive hemodynamic monitoring, breath-resolved spirometry and capnometry during controlled tidal breathing (12 breaths/min)...
September 19, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28925362/generation-of-a-klf15-homozygous-knockout-human-embryonic-stem-cell-line-using-paired-crispr-cas9n-and-human-cardiomyocytes-derivation
#7
Claudia Noack, Luis Peter Haupt, Wolfram-Hubertus Zimmermann, Katrin Streckfuss-Bömeke, Laura Cecilia Zelarayán
Krueppel-like factor 15 (KLF15) is abundantly expressed in liver, kidney, and muscle, including myocardium. In the adult heart KLF15 is important to maintain homeostasis and to repress hypertrophic remodeling. We generated a homozygous hESC KLF15 knockout (KO) line using paired CRISPR/Cas9n. KLF15-KO cells maintained full pluripotency and differentiation potential as well as genomic integrity. We demonstrated that KLF15-KO cells can be differentiated into morphologically normal cardiomyocytes turning them into a valuable tool for studying human KLF15-mediated mechanisms resulting in human cardiac dysfunction...
August 2017: Stem Cell Research
https://www.readbyqxmd.com/read/28924218/uncontrolled-angiogenic-precursor-expansion-causes-coronary-artery-anomalies-in-mice-lacking-pofut1
#8
Yidong Wang, Bingruo Wu, Pengfei Lu, Donghong Zhang, Brian Wu, Shweta Varshney, Gonzalo Del Monte-Nieto, Zhenwu Zhuang, Rabab Charafeddine, Adam H Kramer, Nicolas E Sibinga, Nikolaos G Frangogiannis, Richard N Kitsis, Ralf H Adams, Kari Alitalo, David J Sharp, Richard P Harvey, Pamela Stanley, Bin Zhou
Coronary artery anomalies may cause life-threatening cardiac complications; however, developmental mechanisms underpinning coronary artery formation remain ill-defined. Here we identify an angiogenic cell population for coronary artery formation in mice. Regulated by a DLL4/NOTCH1/VEGFA/VEGFR2 signaling axis, these angiogenic cells generate mature coronary arteries. The NOTCH modulator POFUT1 critically regulates this signaling axis. POFUT1 inactivation disrupts signaling events and results in excessive angiogenic cell proliferation and plexus formation, leading to anomalous coronary arteries, myocardial infarction and heart failure...
September 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28924048/a-mutant-of-the-bmk-antitumor-analgesic-peptide-exhibits-reduced-inhibition-to-hnav1-4-and-hnav1-5-channels-while-retaining-analgesic-activity
#9
Yijia Xu, Xiangxue Meng, Xue Hou, Jianfang Sun, Xiaohua Kong, Yuqi Sun, Zeyu Liu, Yuanyuan Ma, Ye Niu, Yongbo Song, Yong Cui, Mingyi Zhao, Jinghai Zhang
Scorpion toxins can kill other animals by inducing paralysis and arrhythmia, which limits the potential applications of these agents in the clinical management of diseases. Antitumor-analgesic peptide (AGAP), purified from Buthus martensii Karsch (BmK), has been proved to possess analgesic and antitumor activities. Trp38, a conserved aromatic residue of AGAP, might play an important role in mediating AGAP activities according to the sequence and homology modeling analyses. Therefore, an AGAP mutant W38G was generated, and effects of both AGAP and the mutant W38G were examine by whole-cell patch clamp techniques on the sodium channels hNav1...
September 18, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28923793/dose-comparison-study-of-allogeneic-mesenchymal-stem-cells-in-patients-with-ischemic-cardiomyopathy-the-trident-study
#10
Victoria Florea, Angela C Rieger, Darcy L Difede, Jill El-Khorazaty, Makoto Natsumeda, Monisha N Banerjee, Bryon A Tompkins, Aisha Khan, Ivonne H Schulman, Ana M Landin, Muzammil Mushtaq, Maureen H Lowery, John Byrnes, Robert C Hendel, Mauricio G Cohen, Krystalenia Valasaki, Marietsy V Pujol, Eduard Ghersin, Roberto Miki, Cindy Delgado, Fouad A Abuzeid, Mayra Vidro-Casiano, Russell Saltzman, Daniel DaFonseca, Lina V Caceres, Kevin N Ramdas, Adam Mendizabal, Alan W Heldman, Raul D Mitrani, Joshua M Hare
Rationale: Cell dose and concentration play crucial roles in phenotypic responses to cell-based therapy for heart failure. Objective: To compare the safety and efficacy of two doses of allogeneic bone marrow-derived human mesenchymal stem cells (hMSC) identically delivered in patients with ischemic cardiomyopathy (ICM). Methods and Results: Thirty patients with ICM received in a blinded manner either 20 million (20M, n=15) or 100 million (100M, n=15) allogeneic hMSCs via transendocardial injection (10 0.5 cc injections/patient)...
September 18, 2017: Circulation Research
https://www.readbyqxmd.com/read/28923791/gja1-20k-arranges-actin-to-guide-cx43-delivery-to-cardiac-intercalated-discs
#11
Wassim A Basheer, Shaohua Xiao, Irina Epifantseva, Ying Fu, Andre G Kleber, TingTing Hong, Robin M Shaw
Rationale: Delivery of connexin 43 (Cx43) to the intercalated disc is a continuous and rapid process critical for intercellular coupling. By a pathway of targeted delivery involving microtubule highways, vesicles of Cx43 hemichannels are efficiently trafficked to adherens junctions at intercalated discs. It has also been identified that actin provides rest stops for Cx43 forward trafficking, and that Cx43 has a 20kDa internally translated small C-terminus isoform (GJA1-20k) which is required for full-length Cx43 trafficking, but by an unknown mechanism...
September 18, 2017: Circulation Research
https://www.readbyqxmd.com/read/28923539/efficient-vegf-targeting-delivery-of-dox-using-bevacizumab-conjugated-sio2-ldh-for-anti-neuroblastoma-therapy
#12
Rongrong Zhu, Zhaoqi Wang, Peng Liang, Xiaolie He, Xizhen Zhuang, Ruiqi Huang, Mei Wang, Qigang Wang, Yechang Qian, Shilong Wang
Vascular endothelial growth factor (VEGF) plays an important role in angiogenesis and is highly expressed in carcinoma, which make it an important target for tumor targeting therapy. Neuroblastoma is the main cause for cancer-related death in children. Like most solid tumors, it is also accompanied with the overexpression of VEGF. Doxorubicin Hydrochloride (DOX), a typical chemotherapeutic agent, exhibits efficient anticancer activities for various cancers. However, DOX, without targeting ability, usually causes severe damage to normal tissues...
September 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28922712/ellagic-acid-promotes-ventricular-remodeling-after-acute-myocardial-infarction-by-up-regulating-mir-140-3p
#13
Da-Zhen Wei, Cong Lin, Yin-Qing Huang, Lian-Pin Wu, Ming-Yuan Huang
In the paper, we observed the effect of ellagic acid (EA) on myocardial morphology and cardiac function and explored the mechanism of miR-140-3p-mediated EA in ventricular remodeling. The experimental animals were divided into 3 groups: control group, AMI group, AMI+EA group. Intragastric administration for 4 weeks was initiated on the first day after surgery in rats. Rodent echocardiography was used to measure heart size and cardiac function. The level of fibrosis was observed by Masson staining. The number of cell apoptosis was detected by TUNEL method...
September 12, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28922269/extubation-failure-is-associated-with-increased-mortality-following-first-stage-single-ventricle-reconstruction-operation
#14
Thomas Scodellaro, Jane M McKenzie, Yves d'Udekem, Warwick Butt, Siva P Namachivayam
OBJECTIVES: To identify the prevalence, causes, risk factors, and outcomes associated with extubation failure following first stage single ventricle reconstruction surgery. DESIGN: Retrospective cohort analysis of neonates who underwent a first stage single ventricle reconstruction operation. Extubation failure was defined as endotracheal reintubation within 48 hours of first extubation attempt. SETTING: The Royal Children's Hospital, Melbourne...
September 15, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28921674/decline-in-effort-capacity-with-age-echocardiographic-stress-analysis-in-the-elderly
#15
Anat Milman, Gad Keren, Yan Topilsky
BACKGROUND: The present study was designed to assess the underlying mechanism of decline in effort capacity seen with aging. METHODS: We analyzed 250 healthy senior patients (≥65 years) with an ejection fraction ≥60% who underwent a stress echocardiogram test. The seniors (aged 65-94) were divided into 3 equal age groups (groups 1, 2, and 3), and their echo characteristics at rest and peak exercise (measured and calculated) were compared. RESULTS: Diastolic function at rest declined significantly (E lateral, E septal, E/E', A) with age, while other rest parameters were similar...
September 17, 2017: Echocardiography
https://www.readbyqxmd.com/read/28920705/human-endothelial-progenitor-cell-derived-exosomes-increase-proliferation-and-angiogenesis-in-cardiac-fibroblasts-by-promoting-the-mesenchymal-endothelial-transition-and-reducing-high-mobility-group-box-1-protein-b1-expression
#16
Xiao Ke, Dahao Yang, Jiawen Liang, Xing Wang, Shaoyun Wu, Xiaoqing Wang, Chengheng Hu
Myocardial fibrosis is a characteristic feature of cardiomyopathies. However, no effective strategies to attenuate cardiac fibrosis are currently available. Late-stage endothelial progenitor cells (EPCs) are precursors of endothelial cells (ECs) that repair the heart through a paracrine mechanism. In the present study, we tested whether EPC-derived exosomes regulate the differentiation of fibroblasts into ECs. We isolated late-stage EPCs from human peripheral blood (PB) and used immunofluorescence and flow cytometry to confirm their identity...
September 18, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28920704/endothelial-to-mesenchymal-transition-a-potential-mechanism-for-atherosclerosis-plaque-progression-and-destabilization
#17
Afang Li, Wenxi Peng, Xiaodan Xia, Rongqing Li, Yu Wang, Dangheng Wei
Endothelial-to-mesenchymal transition (EndMT) is a cellular reprogramming mechanism by which endothelial cells acquire a mesenchymal phenotype. EndMT is associated with fibroproliferative diseases, such as cancer progression and metastasis and cardiac and kidney fibrosis, and this condition has been extensively investigated over the past decade. Recently, studies showed that EndMT contributes to the initiation and progression of atherosclerotic lesion and plaque destabilization. Unstable atherosclerotic plaque rupture and subsequent thrombosis are the main pathological causes of acute cardiovascular events...
September 18, 2017: DNA and Cell Biology
https://www.readbyqxmd.com/read/28919864/%C3%AE-subunits-control-the-effects-of-human-kv4-3-potassium-channel-phosphorylation
#18
Geoffrey W Abbott
The transient outward K(+) current, Ito, activates early in the cardiac myocyte action potential, to begin repolarization. Human Ito is generated primarily by two Kv4.3 potassium channel α subunit splice variants (Kv4.3L and Kv4.3S) that diverge only by a C-terminal, membrane-proximal, 19-residue stretch unique to Kv4.3L. Protein kinase C (PKC) phosphorylation of threonine 504 within the Kv4.3L-specific 19-residues mediates α-adrenergic inhibition of Ito in human heart. Kv4.3 is regulated in human heart by various β subunits, including cytosolic KChIP2b and transmembrane KCNEs, yet their impact on the functional effects of human Kv4...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28919827/is-a-mechanical-assist-device-better-than-manual-chest-compression-a-randomized-controlled-trial
#19
Chaiyaporn Yuksen, Thidathit Prachanukool, Kasamon Aramvanitch, Nuttamon Thongwichit, Kittisak Sawanyawisuth, Yuwares Sittichanbuncha
BACKGROUND: Chest compression quality is a determinant of survival from sudden cardiac arrest. The CPR RsQ Assist Device (CPR RAD) is a new cardiopulmonary resuscitation device for chest compression. It is operated manually but it does not pull up on the chest on the up stroke. The aim of this study was to compare the CPR RAD with standard manual compression in terms of chest compression quality in a manikin model. METHODS: Participants were randomly assigned to either the device or manual chest compression group...
2017: Open Access Emergency Medicine: OAEM
https://www.readbyqxmd.com/read/28919378/sudden-death-mechanisms-in-non-ischemic-cardiomyopathies-insights-gleaned-from-clinical-implantable-cardioverter-defibrillator-trials
#20
Benjamin A Steinberg, Siva K Mulpuru, James C Fang, Bernard J Gersh
Sudden cardiac death (SCD) represents a major cause of death among patients with heart failure. While scar-based, macro-reentrant ventricular tachycardia and ventricular fibrillation (VT/VF) is the primary etiology for SCD among patients with ischemic cardiomyopathy, a more diverse set of mechanisms and substrates are likely at play for the diverse group of patients characterized by non-ischemic, dilated cardiomyopathy (NICM). These causes may include scar-based re-entry, but also neurohormonal stimulation (sympathetic, parasympathetic, renin-angiotensin-aldosterone), inflammation, and non-arrhythmic processes occurring in the context of a genetic predisposition...
September 14, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
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