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https://www.readbyqxmd.com/read/29792814/perspectives-of-a-myosin-motor-activator-agent-with-increased-selectivity
#1
Peter Nanasi, Istvan Komaromi, Janos Almassy
Clinical treatment of heart failure is still not fully solved. A novel class of agents, the myosin motor activators, acts directly on cardiac myosin resulting in an increased force generation and prolongation of contraction. Omecamtiv mecarbil, the lead molecule of this group, is now in human 3 phase displaying promising clinical performance. However, omecamtiv mecarbil is not selective to myosin, since it readily binds to and activates cardiac ryanodine receptors (RyR-2), an effect that may cause complications is case of overdose...
May 24, 2018: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/29792551/aponeurosis-influences-the-relationship-between-muscle-gearing-and-force
#2
Carolyn M Eng, Thomas J Roberts
Aponeuroses are connective tissues found on the surface of pennate muscles and are in close association with muscle fascicles. In addition to transmitting muscle forces to the external tendon, aponeurosis has been hypothesized to influence the direction of muscle shape change during a contraction. Muscle shape changes affect muscle contractile force and velocity because they influence the gear ratio with which muscle fascicles transmit force and velocity to the tendon. If aponeurosis modulates muscle shape changes, altering the aponeurosis' radial integrity with incisions should alter gearing...
May 24, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29792383/donor-variation-and-optimization-of-human-mesenchymal-stem-cells-chondrogenesis-in-hyaluronic-acid
#3
Minwook Kim, Isaac E Erickson, Alice H Huang, Sean T Garrity, Robert L Mauck, David R Steinberg
Mesenchymal stem cells (MSCs) are an attractive cell type for cartilage repair that can undergo chondrogenesis in a variety of three dimensional (3D) scaffolds. Hyaluronic acid (HA) hydrogels provide a biologically relevant interface for cell encapsulation. While our previous studies have shown that MSC-laden HA constructs can mature in vitro to match native mechanical properties using cells from animal sources, clinical application will depend on the successful translation of these findings to human cells...
May 24, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29792179/hopkins-syndrome-following-the-first-episode-of-bronchial-asthma-associated-with-enterovirus-d68-a-case-report
#4
Fumie Hayashi, Shintaro Hayashi, Dai Matsuse, Ryo Yamasaki, Keiji Yonekura, Jun-Ichi Kira
BACKGROUND: Hopkins syndrome (HS) is a rare disorder presenting with acute flaccid paralysis of the limbs following an asthma attack. Neurologists encounter a diagnostic challenge if patients without a history of bronchial asthma develop neurologic features mimicking HS following acute respiratory distress. We report a case of HS occurring after a first episode of bronchial asthma associated with enterovirus D68 infection. CASE PRESENTATION: A 5-year-old girl developed acute respiratory distress...
May 23, 2018: BMC Neurology
https://www.readbyqxmd.com/read/29791931/effectiveness-of-a-crocus-sativus-extract-on-burn-wounds-in-rats
#5
Esmat Alemzadeh, Ahmad Oryan
Crocus sativus is a spice with various pharmacological properties. Crocin, picrocrocin, and safranal are the main compositions of saffron that have recently been considered in the therapy of many diseases. High-performance liquid chromatography analysis revealed presence of these compounds in our saffron extract. This study was carried out to evaluate the effect of saffron on burn wound healing at an in vivo model. Saffron was topically applied on burn wounds in rats; the percentage of wound closure, wound contraction, and the levels of main cytokines and growth factors were measured...
May 23, 2018: Planta Medica
https://www.readbyqxmd.com/read/29791845/equilibrative-nucleoside-transporter-3-regulates-t-cell-homeostasis-by-coordinating-lysosomal-function-with-nucleoside-availability
#6
Chin-Wen Wei, Chia-Ying Lee, Ding-Jin Lee, Chang-Feng Chu, Ju-Chu Wang, Tien-Chiao Wang, Wann-Neng Jane, Zee-Fen Chang, Chuen-Miin Leu, Ivan L Dzhagalov, Chia-Lin Hsu
T cells are a versatile immune cell population responding to challenges by differentiation and proliferation followed by contraction and memory formation. Dynamic metabolic reprogramming is essential for T cells to meet the biosynthetic needs and the reutilization of biomolecules, processes that require active participation of metabolite transporters. Here, we show that equilibrative nucleoside transporter 3 (ENT3) is highly expressed in peripheral T cells and has a key role in maintaining T cell homeostasis by supporting the proliferation and survival of T cells...
May 22, 2018: Cell Reports
https://www.readbyqxmd.com/read/29791840/dynamic-cellular-integration-drives-functional-assembly-of-the-heart-s-pacemaker-complex
#7
Michael Bressan, Trevor Henley, Jonathan D Louie, Gary Liu, Danos Christodoulou, Xue Bai, Joan Taylor, Christine E Seidman, J G Seidman, Takashi Mikawa
Impulses generated by a multicellular, bioelectric signaling center termed the sinoatrial node (SAN) stimulate the rhythmic contraction of the heart. The SAN consists of a network of electrochemically oscillating pacemaker cells encased in a heterogeneous connective tissue microenvironment. Although the cellular composition of the SAN has been a point of interest for more than a century, the biological processes that drive the tissue-level assembly of the cells within the SAN are unknown. Here, we demonstrate that the SAN's structural features result from a developmental process during which mesenchymal cells derived from a multipotent progenitor structure, the proepicardium, integrate with and surround pacemaker myocardium...
May 22, 2018: Cell Reports
https://www.readbyqxmd.com/read/29791773/vaginal-microbiome-studies-in-pregnancy-must-also-analyse-host-factors
#8
S S Witkin
It seems logical that the composition of the vaginal microbiota would be a significant variable influencing pregnancy outcome. Bacteria that are not part of the normal microbiota can trigger induction of myometrial contractions and premature delivery. Components of the endogenous microbiome may also be capable, under conditions still ill-defined, of interfering with pregnancy progression. This article is protected by copyright. All rights reserved.
May 23, 2018: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/29791760/neopterin-7-8-dihydroneopterin-is-elevated-in-duchenne-muscular-dystrophy-patients-and-protects-mdx-skeletal-muscle-function
#9
Angus Lindsay, Alexandra Schmiechen, Christopher M Chamberlain, James M Ervasti, Dawn A Lowe
Macrophage infiltration is a hallmark of dystrophin-deficient muscle. We tested the hypothesis that Duchenne muscular dystrophy (DMD) patients would have elevated levels of the macrophage synthesized pterins, neopterin and 7,8-dihydroneopterin compared to unaffected age-matched controls. Urinary neopterin/creatinine and 7,8-dihydroneopterin/creatinine were elevated in DMD patients and 7,8-dihydroneopterin/creatinine was associated with patient age and ambulation. 7,8-dihydroneopterin correction with specific gravity was also elevated in DMD patients...
May 23, 2018: Experimental Physiology
https://www.readbyqxmd.com/read/29791580/influence-of-aerobic-training-on-the-mechanics-of-ventricular-contraction-after-acute-myocardial-infarction-a-pilot-study
#10
Giovani Luiz De Santi, Henrique Turin Moreira, Eduardo Elias Vieira de Carvalho, Júlio César Crescêncio, André Schmidt, José Antônio Marin-Neto, Lourenço Gallo-Júnior
The study of myocardial contractility, based on the new anatomical concepts that govern cardiac mechanics, represents a promising strategy of analysis of myocardial adaptations related to physical training in the context of post-infarction. We investigated the influence of aerobic training on physical capacity and on the evaluation parameters of left ventricular contraction mechanics in patients with myocardial infarction. Thirty-one patients (55.1 ± 8.9 years) who had myocardial infarction in the anterior wall were prospectively investigated in three groups: interval training group (ITG) (n = 10), moderate training group (MTG) n = 10) and control group (CG) (n = 10)...
April 2018: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/29791204/role-of-adenosine-signaling-in-coordinating-cardiomyocyte-function-and-coronary-vascular-growth-in-chronic-fetal-anemia
#11
Lowell Davis, James Musso, Divya Soman, Samantha Louey, Jonathan William Nelson, Sonnet S Jonker
Fetal anemia causes rapid and profound changes in cardiac structure and function, stimulating proliferation of the cardiac myocytes, expansion of the coronary vascular tree, and impairing early contraction and relaxation. While HIF-1α is sure to play a role, adenosine, a metabolic byproduct that increases coronary flow and growth, is implicated as a major stimulus for these adaptations. We hypothesized that genes involved in myocardial adenosine signaling would be up-regulated in chronically anemic fetuses, and that calcium handling genes would be down-regulated...
May 23, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29791059/the-use-of-high-resolution-colonic-manometry-to-establish-etiology-and-direct-treatment-in-patients-with-constipation-case-series-with-correlation-to-histology
#12
Yuwei Li, Jiying Cong, Fei Fei, Zhao Zhang, Yongjun Yu, Chen Xu, Xipeng Zhang, Shiwu Zhang
BACKGROUND AND AIM: Different clinical treatments are available to treat patients with constipation. We aimed to study the etiology and direct treatment in a case series of patients with constipation by the use of high-resolution colonic manometry (HRCM). METHODS: HRCM was used to record the colorectal peristaltic contractions of the entire colon in patients. Based on the results of HRCM, 151 patients with constipation were classified into groups and received different clinical treatment such as a total or subtotal colectomy, local excision, or conservative treatment...
May 23, 2018: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29790736/desymmetrization-of-meso-dibromocycloalkenes-through-copper-i-catalyzed-asymmetric-allylic-substitution-with-organolithium-reagents
#13
Shermin S Goh, Sureshbabu Guduguntla, Takashi Kikuchi, Martin Lutz, Edwin Otten, Makoto Fujita, Ben L Feringa
The highly regio- and enantioselective (up to >99:1 dr, up to 99:1 er) desymmetrization of meso-1,4-dibromocycloalk-2-enes using asymmetric allylic substitution with organolithium reagents to afford enantioenriched bromocycloalkenes (ring size of 5 to 7) has been achieved. The cycloheptene products undergo an unusual ring contraction. The synthetic versatility of this Cu(I)-catalyzed reaction is demonstrated by the concise stereocontrolled preparation of cyclic amino alcohols, which are privileged chiral structures in natural products and pharmaceuticals, and widely used in synthesis and catalysis...
May 23, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29790684/the-effect-of-music-on-the-cardiac-activity-of-a-fetus-in-a-cardiotocographic-examination
#14
Grażyna Gebuza, Marta Zaleska, Marzena Kaźmierczak, Estera Mieczkowska, Małgorzata Gierszewska
BACKGROUND: Music therapy as an adjunct to treatment is rarely used in perinatology and obstetrics, despite the proven therapeutic effect. Auditory stimulation through music positively impacts the health of adults and infants, its special role being observed in the development of prematurely born neonates. It is equally interesting how music impacts fetuses. OBJECTIVES: The aim of this study is to assess the parameters of fetuses through cardiotocographic recording in women in the 3rd trimester of pregnancy while listening to Pyotr Tchaikovsky's "Sleeping Beauty" and "Swan Lake...
April 24, 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29790341/transition-metal-free-access-to-pyridocarbazoles-from-2-alkynylindole-3-carbaldehydes-via-azomethine-ylide
#15
Shalini Verma, Pawan K Mishra, Manoj Kumar, Souvik Sur, Akhilesh K Verma
An efficient approach for the synthesis of functionalized tetrahydro-pyrido/quinolinocarbazoles from 2-alkynylindole-3-carbaldehydes and L-proline utilizing a metal-free decarboxylative cyclization, ring expansion, and ring contraction strategy via the generation of azomethine ylide has been developed. The reaction of 2-alkynylindole-3-carbaldehydes with L-thioproline leads to the formation of γ-carbolines. By virtue of this expedient method, a diverse range of biologically active hetero-annulated carbazoles can be synthesized efficiently...
May 23, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29790207/the-repeated-bout-effect-can-occur-without-mechanical-and-neuromuscular-changes-after-a-bout-of-eccentric-exercise
#16
Patricio A Pincheira, Ben W Hoffman, Andrew G Cresswell, Timothy J Carroll, Nicholas A T Brown, Glen A Lichtwark
Changes in muscle fascicle mechanics have been postulated to underpin the repeated bout effect (RBE) observed following exercise-induced muscle damage (EIMD). However, in the medial gastrocnemius (MG), mixed evidence exists on whether fascicle stretch amplitude influences the level of EIMD, thus questioning whether changes in fascicle mechanics underpin the RBE. An alternative hypothesis is that neural adaptations contribute to the RBE in this muscle. The aim of this study was to investigate neuromechanical adaptations during and after repeated bouts of a highly controlled muscle lengthening exercise that aimed to maximise EIMD in MG...
May 23, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29790164/purinergic-receptor-stimulation-induces-calcium-oscillations-and-smooth-muscle-contraction-in-small-pulmonary-veins
#17
Mauricio Henriquez, Marcelo Fonseca, Jose F Perez-Zoghbi
KEY POINTS: We investigated the excitation-contraction coupling mechanisms in small pulmonary veins (SPVs) in rat precision-cut lung slices. We found that SPVs contract strongly and reversibly in response to extracellular ATP and other vasoconstrictors, including angiotensin-II and endothelin-1. ATP-induced vasoconstriction in SPVs was associated with the stimulation of purinergic P2Y2 receptors in vascular smooth muscle cell, activation of phospholipase C-β and the generation of intracellular Ca2+ oscillations mediated by cyclic Ca2+ release events via the inositol 1,4,5-trisphosphate receptor...
May 23, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29790158/change-in-mallampati-class-during-labor-hypertensive-versus-normotensive-parturients
#18
D Raza, S Ismail
BACKGROUND: Mallampati class has been shown to increase during labor. There are no prospective studies evaluating airway changes in hypertensive parturients during labor. The aim of our study was to observe the frequency of change in Mallampati class during labor in hypertensive compared to normotensive parturients. METHODS: In this prospective observational cohort study, 60 parturients were enrolled and divided into two groups of 30 each: hypertensive parturients and normotensive parturients...
May 22, 2018: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/29790145/-nursing-experience-of-using-mirror-visual-feedback-for-a-schizophrenia-patient-with-visual-hallucinations
#19
Shu-Ling Lan, Yu-Chi Chen, Hsiu-Ju Chang
The aim of this paper was to describe the nursing application of mirror visual feedback in a patient suffering from long-term visual hallucinations. The intervention period was from May 15th to October 19th, 2015. Using the five facets of psychiatric nursing assessment, several health problems were observed, including disturbed sensory perceptions (prominent visual hallucinations) and poor self-care (e.g. limited abilities to self-bathe and put on clothing). Furthermore, "caregiver role strain" due to the related intense care burden was noted...
June 2018: Hu Li za Zhi the Journal of Nursing
https://www.readbyqxmd.com/read/29790076/a-case-of-jackhammer-esophagus-caused-by-eosinophilic-esophagitis-in-which-per-oral-endoscopic-myotomy-resulted-in-symptom-improvement
#20
Shinwa Tanaka, Takashi Toyonaga, Fumiaki Kawara, Daisuke Watanabe, Namiko Hoshi, Hirohumi Abe, Ryusuke Ariyoshi, Yoshiko Ohara, Tsukasa Ishida, Toshitatsu Takao, Yoshinori Morita, Eiji Umegaki
A 73-year-old female with a 6-month history of progressive dysphagia and chest pain was referred to our hospital. She underwent esophagogastroduodenoscopy, which revealed abnormally strong contractions in the distal esophagus. Esophageal biopsy specimens showed massive eosinophil infiltration into the epithelium, and high-resolution manometry (HRM) also demonstrated abnormally strong contractions in the distal esophagus. Based on these results, she was diagnosed with Jackhammer esophagus (JHE) due to eosinophilic esophagitis (EoE)...
May 22, 2018: Clinical Journal of Gastroenterology
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