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https://www.readbyqxmd.com/read/28646097/highly-suggestive-preliminary-evidence-that-the-renal-interstitium-contracts-in%C3%A2-vivo
#1
Omar Flores-Sandoval, María Eugenia Sánchez-Briones, Juan F López-Rodríguez, Miriam Z Calvo-Turrubiartes, Lilia Llamazares-Azuara, Manuel Rodríguez-Martínez
To learn more about controlling renal interstitial hydrostatic pressure (RIHP), we assessed its response to renal medullary direct interstitial volume expansion (rmDIVE = 100 μL bolus infusion/30 sec). Three experimental series (S) were performed in hydropenic, anesthetized, right-nephrectomized, acute left renal-denervated and renal perfusion pressure-controlled rats randomly assigned to groups in each S. S1: Rats without hormonal clamp were contrasted before and after rmDIVE induced via 0.9% saline solution bolus (SS group) or 2% albumin in SS bolus (2% ALB + SS group)...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28645860/gper-agonist-dilates-mesenteric-arteries-via-pi3k-akt-enos-and-potassium-channels-in-both-sexes
#2
Pollyana Peixoto, Rosária Dias Aires, Virgínia Soares Lemos, Nazaré Souza Bissoli, Roger Lyrio Dos Santos
AIM: The action of oestrogen has traditionally been attributed to the activation of nuclear receptors (ERα and ERβ). A third receptor, the G protein-coupled oestrogen receptor (GPER), has been described as mediator of the rapid action of oestrogen. Based on the possible protective role of oestrogen in the cardiovascular system, the present study was designed to determine whether selective GPER activation induces relaxation of mesenteric resistance arteries in both sexes and which signalling pathways are involved...
June 20, 2017: Life Sciences
https://www.readbyqxmd.com/read/28643702/surface-magnetism-of-l1-sub-0-sub-copt-alloy-first-principles-predictions
#3
Zhenyu Liu, Guofeng Wang
We used the first-principles density functional theory (DFT) to predict the magnetic properties of (100), (001), (101), (110), and (111) surfaces of L10 ordered CoPt alloy. Our results indicate that bulk-terminated CoPt surfaces exhibit magnetic moment higher than that of bulk CoPt crystal and surface magnetic anisotropy favoring in-plane magnetization. Moreover, our DFT calculations predict that Pt prefers to segregate to the outermost layer of all these five CoPt surfaces with energy gain in the range of 0...
June 23, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28640447/role-of-serca-pump-in-muscle-thermogenesis-and-metabolism
#4
Muthu Periasamy, Santosh Kumar Maurya, Sanjaya Kumar Sahoo, Sushant Singh, Sanjaya Kumar Sahoo, Felipe C G Reis, Naresh Chandra Bal
In muscle cells, the sarcoplasmic reticulum (SR) not only acts as a Ca2+ store, but also regulates the contractile characteristics of the muscle. Ca2+ release from the SR is the primary mechanism for activating muscle contraction and reuptake of Ca2+ by the sarcoplasmic reticulum Ca2+ ATPase (SERCA) pump causes muscle relaxation. The SERCA pump isoforms are encoded by three genes, SERCA 1, 2, and 3, which are differentially expressed in muscle and determine SR Ca2+ dynamics by affecting the rate and amount of Ca2+ uptake, thereby affecting SR store and release of Ca2+ in muscle...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28637786/the-role-of-capsaicin-sensitive-c-fiber-afferent-pathways-in-the-control-of-micturition-in-spinal-intact-and-spinal-cord-injured-mice
#5
Katsumi Kadekawa, Tsuyoshi Majima, Takahiro Shimizu, Naoki Wada, William C de Groat, Anthony J Kanai, Momokazu Goto, Mitsuharu Yoshiyama, Kimio Sugaya, Naoki Yoshimura
We examined bladder and urethral sphincter activity in mice with or without spinal cord injury (SCI) after C-fiber afferent desensitization induced by capsaicin pretreatment and changes in electrophysiological properties of mouse bladder afferent neurons 4 weeks after SCI. Female C57BL/6N mice were divided into 4 groups; (1) spinal intact (SI)-control, (2) SI-capsaicin pretreatment (Cap), (3) SCI-control and (4) SCI-Cap groups. Continuous cystometry and external urethral sphincter (EUS)-electromyogram (EMG) were conducted under an awake condition...
June 21, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28635612/consequences-of-lipopolysaccharide-and-n-3-polyunsaturated-fatty-acid-administration-on-aortic-function-of-spontaneously-hypertensive-rats
#6
Barbara Kaprinay, Ruzena Sotnikova, Karel Frimmel, Jakub Krizak, Iveta Bernatova, Jana Navarova, Ludmila Okruhlicova
The aim of the work was to study the delayed effect of lipopolysaccharide (LPS) administration on endothelial function of the aorta of rats with genetic hypertension. Further, the possibility to ameliorate LPS-induced changes by n-3 polyunsaturated fatty acids (n-3 PUFA) was tested. Rats received a bolus of 1 mg/kg LPS i.p.; n-3 PUFA were administered in the dose of 30 mg/kg daily for 10 days p.o.. Ten days after receiving of LPS, the body weight gain of rats was statistically lower compared to control rats (p < 0...
July 2017: General Physiology and Biophysics
https://www.readbyqxmd.com/read/28630830/bilateral-humerus-and-right-femur-fracture-in-a-newborn-after-cesarean-section-for-breech-presentation-in-a-twin-pregnancy-a-very-rare-case-report
#7
P Rahul, Amit Rakesh Grover, S M Ajoy
INTRODUCTION: The most common fractures during vaginal delivery occur in the clavicle, humerus, and femur. Cesarean section reduces the chances of a child having a birth injury. However, in some difficult extractions, long bone fractures may occur. Cesarean section further reduces the incidence of birth injuries, especially in a breech delivery. Maneuvers employed during cesarean section, energetic traction, improper uterine incisions, and contracted uterus may cause these injuries. In the medical literature, there are few articles highlighting the occurrence of long bone fractures during cesarean section...
January 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28630432/down-regulation-of-kca2-3-channels-causes-erectile-dysfunction-in-mice
#8
Simon Comerma-Steffensen, Attila Kun, Elise R Hedegaard, Susie Mogensen, Christian Aalkjaer, Ralf Köhler, Birgitte Mønster Christensen, Ulf Simonsen
Modulation of endothelial calcium-activated K(+) channels has been proposed as an approach to restore arterial endothelial cell function in disease. We hypothesized that small-conductance calcium-activated K(+) channels (KCa2.3 or SK3) contributes to erectile function. The research was performed in transgenic mice with overexpression (KCa2.3 (T/T(-Dox))) or down-regulation (KCa2.3 (T/T(+Dox))) of the KCa2.3 channels and wild-type C57BL/6-mice (WT). QPCR revealed that KCa2.3 and KCa1.1 channels were the most abundant in mouse corpus cavernosum...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630006/multiple-conformational-states-of-dnaa-protein-regulate-its-interaction-with-dnaa-boxes-in-the-initiation-of-dna-replication
#9
Meera J Patel, Lavesh Bhatia, Gulden Yilmaz, Esther E Biswas-Fiss, Subhasis B Biswas
DnaA protein is the initiator of genomic DNA replication in prokaryotes. It binds to specific DNA sequences in the origin of DNA replication and unwinds small AT-rich sequences downstream for the assembly of the replisome. The mechanism of activation of DnaA that enables it to bind and organize the origin DNA and leads to replication initiation remains unclear. In this study, we have developed double-labeled fluorescent DnaA probes to analyze conformational states of DnaA protein upon binding DNA, nucleotide, and Soj sporulation protein using Fluorescence Resonance Energy Transfer (FRET)...
June 16, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28626072/5-ht-causes-splanchnic-venodilation
#10
Bridget Mahon Seitz, Hakan Orer, Teresa Krieger-Burke, Emma S Darios, Janice M Thompson, Gregory D Fink, Stephanie W Watts
Serotonin (5-HT, 5-hydroxytrypamine) causes relaxation of the isolated superior mesenteric vein (SMV), a splanchnic blood vessel, through activation of the 5-HT7 receptor. As part of studies designed to identify the mechanism(s) through which chronic (>24 hours) infusion of 5-HT lowers blood pressure, we test the hypothesis that 5-HT causes an in vitro and in vivo splanchnic venodilation that is 5-HT7 receptor-dependent. In tissue baths for measurement of isometric contraction, the portal vein (PV) and abdominal inferior vena cava (Ab IVC) relaxed to 5-HT and the 5-HT1/7 receptor agonist 5-carboxamidotryptamine (5-CT); relaxation was abolished by the 5-HT7 receptor antagonist SB269970...
June 16, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28624852/vasoconstrictor-responsiveness-in-contracting-human-muscle-influence-of-contraction-frequency-contractile-work-and-metabolic-rate
#11
Nicholas T Kruse, William E Hughes, Kenichi Ueda, Darren P Casey
PURPOSE: The aim of this study was to examine whether independent effects exist between contractile work and metabolic demand (VO2m) on vasoconstrictor responsiveness (i.e., functional sympatholysis) under different contraction durations matched for total contractile work in exercising human skeletal muscle. METHODS: Ten young men performed rhythmic forearm contractions at 10 and 15% of maximum voluntary contraction (MVC) which consisted of muscle contractions using the same duty cycle but altering the duration of the contraction-relaxation cycles of exercise and included: 1) fast frequency contractions at 10% MVC (FFC10%) using a contraction relaxation cycle at 1:2 s; 2) slow frequency contractions at 10% MVC (SFC10%) at 2:4 s; and 3) SFC at 15% MVC (SFC15%) at 2:4 s...
June 17, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28623784/antihypertensive-and-vasodilator-effects-of-methanolic-extract-of-inula-viscosa-biological-evaluation-and-pom-analysis-of-cynarin-chlorogenic-acid-as-potential-hypertensive
#12
Zineb Hakkou, Alexandre Maciuk, Veronique Leblais, Nour Elhouda Bouanani, Hassane Mekhfi, Mohammed Bnouham, Mohammed Aziz, Abderrahime Ziyyat, Abdur Rauf, Taibi Ben Hadda, Usama Shaheen, Seema Patel, Rodolphe Fischmeister, Abdelkhaleq Legssyer
BACKGROUND: Inula viscosa L. (Asteraceae) is a medicinal plant widely used as a folk medicine in oriental Morocco, to treat hypertension. The antihypertensive effect of the methanolic extract obtained from I. viscosa leaves was evaluated in hypertensive L-NAME rats. Systolic blood pressure (SBP) was measured using a non-invasive indirect tail-cuff plethysmographic method. Four groups of rats were used: a control group; a hypertensive group treated with L-NAME (32mg/kg/day); a positive control group treated with L-NAME plus enalapril (15mg/kg/day) as a reference antihypertensive agent; and a group treated with L-NAME plus MeOH-extract (40mg/kg/day)...
June 14, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28617735/evaluating-the-effectiveness-of-using-a-progressive-muscle-relaxation-technique-on-the-self-efficacy-of-breastfeeding-in-mothers-with-preterm-infants
#13
Soheila Karbandi, Seyedeh Maryam Hosseini, Seyedeh Asieh Hosseini, Farshad Sadeghi, Maryam Hesari, Reza Masoudi
BACKGROUND: Breast milk is a God-given gift that conveys a mother's love and compassion and that is made according to the needs and age of the child. Mothers who are interested in the welfare of their newborns tend to breastfeed their children. Training programs have been shown to improve breastfeeding self-efficacy in terms of both duration and amount. PURPOSE: The aim of this study was to evaluate the effect of using the progressive muscle relaxation (PMR) technique on the self-efficacy of breastfeeding in mothers with preterm infants...
June 14, 2017: Journal of Nursing Research: JNR
https://www.readbyqxmd.com/read/28617491/deciphering-the-dynamics-of-star-molecules-in-shear-flow
#14
Jurij Sablić, Matej Praprotnik, Rafael Delgado-Buscalioni
This work analyses the rotation of star polymers under shear flow, in melts, and in good solvent dilute solution. The latter is modeled by single molecule Brownian hydrodynamics, while melts are modeled using non-equilibrium molecular dynamics in closed (periodic) boxes and in open boundaries. A Dissipative Particle Dynamics (DPD) thermostat introduces pairwise monomer friction in melts at will, in directions normal and tangent to the monomer-monomer vectors. Although tangential friction is seldom modeled, we show that it is essential to control hydrodynamic effects in melts...
June 15, 2017: Soft Matter
https://www.readbyqxmd.com/read/28616536/nt-probnp-and-diastolic-left-ventricular-function-in-patients-with-marfan-syndrome
#15
Petra Gehle, Peter N Robinson, Frank Heinzel, Frank Edelmann, Mustafa Yigitbasi, Felix Berger, Volkmar Falk, Burkert Pieske, Ernst Wellnhofer
AIMS: Subclinical diastolic dysfuntion in patients with preclinical heart failure with preserved ejection fraction (HFpEF) has been demonstrated in patients with Marfan syndrome (MFS). We investigated the relationship between diastolic dysfunction and NT-proBNP levels in patients with MFS. METHODS AND RESULTS: NT-proBNP, C-reactive protein (CRP) and diastolic function were assessed in 217 patients with MFS (31 ± 16 y, 110 f. and in 339 patients referred for suspected MFS in whom the diagnosis was ruled out according to the Ghent nosology (30 ± 15 y, 154 f)...
September 2016: IJC Heart & Vasculature
https://www.readbyqxmd.com/read/28612936/sensory-feedback-from-the-urethra-evokes-state-dependent-lower-urinary-tract-reflexes-in-rat
#16
Zachary C Danziger, Warren M Grill
Lower urinary tract reflexes are mediated by peripheral afferents from the bladder (primarily in the pelvic nerve) and the urethra (in the pudendal and pelvic nerves) to maintain continence or initiate micturition. If fluid enters the urethra at low bladder volumes, reflexes relax the bladder and evoke external urethral sphincter (EUS) contraction (guarding reflex) to maintain continence. Conversely, urethral flow at high bladder volumes, excites the bladder (micturition reflex) and relaxes the EUS (augmenting reflex)...
June 14, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28612156/reduction-of-sr-ca-2-leak-and-arrhythmogenic-cellular-correlates-by-smp-114-a-novel-camkii-inhibitor-with-oral-bioavailability
#17
Stefan Neef, Christian Mann, Anne Zwenger, Nataliya Dybkova, Lars S Maier
Sarcoplasmic reticulum (SR) Ca(2+) leak induced by Ca(2+)/calmodulin-dependent protein kinase II (CaMKII) is centrally involved in atrial and ventricular arrhythmogenesis as well as heart failure remodeling. Consequently, treating SR Ca(2+) leak has been proposed as a novel therapeutic paradigm, but compounds for use in humans are lacking. SMP-114 ("Rimacalib") is a novel, orally available CaMKII inhibitor developed for human use that has already entered clinical phase II trials to treat rheumatoid arthritis...
July 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28611948/van-wyk-grumbach-syndrome-with-kocher-debr%C3%A3-s%C3%A3-m%C3%A3-laigne-syndrome-case-report-of-a-rare-association
#18
Syed Mohd Razi, Abhinav Kumar Gupta, Deepak Chand Gupta, Manish Gutch, Keshav Kumar Gupta, Syeda Iqra Usman
BACKGROUND: Van Wyk-Grumbach syndrome (VWGS) is a rare presentation of juvenile hypothyroidism which manifests in females as chronic autoimmune hypothyroidism, isosexual pseudoprecocious puberty, and multicystic ovaries. It uniquely presents with short stature and delayed bone age unlike other causes of precocious puberty. Kocher-Debré-Sémélaigne (KDSS) is a rare presentation of juvenile hypothyroidism manifesting as calf muscle pseudohypertrophy, delayed contraction and relaxation of reflexes, and percussion myxedema...
February 2017: European Thyroid Journal
https://www.readbyqxmd.com/read/28607562/cellular-reprogramming-genome-editing-and-alternative-crispr-cas9-technologies-for-precise-gene-therapy-of-duchenne-muscular-dystrophy
#19
REVIEW
Peter Gee, Huaigeng Xu, Akitsu Hotta
In the past decade, the development of two innovative technologies, namely, induced pluripotent stem cells (iPSCs) and the CRISPR Cas9 system, has enabled researchers to model diseases derived from patient cells and precisely edit DNA sequences of interest, respectively. In particular, Duchenne muscular dystrophy (DMD) has been an exemplary monogenic disease model for combining these technologies to demonstrate that genome editing can correct genetic mutations in DMD patient-derived iPSCs. DMD is an X-linked genetic disorder caused by mutations that disrupt the open reading frame of the dystrophin gene, which plays a critical role in stabilizing muscle cells during contraction and relaxation...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28607071/ca-2-induced-movement-of-tropomyosin-on-native-cardiac-thin-filaments-revealed-by-cryoelectron-microscopy
#20
Cristina Risi, Jamie Eisner, Betty Belknap, David H Heeley, Howard D White, Gunnar F Schröder, Vitold E Galkin
Muscle contraction relies on the interaction of myosin motors with F-actin, which is regulated through a translocation of tropomyosin by the troponin complex in response to Ca(2+) The current model of muscle regulation holds that at relaxing (low-Ca(2+)) conditions tropomyosin blocks myosin binding sites on F-actin, whereas at activating (high-Ca(2+)) conditions tropomyosin translocation only partially exposes myosin binding sites on F-actin so that binding of rigor myosin is required to fully activate the thin filament (TF)...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
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