keyword
MENU ▼
Read by QxMD icon Read
search

Contractility

keyword
https://www.readbyqxmd.com/read/28544670/the-clinical-significance-of-esophagogastric-junction-outflow-obstruction-and-hypercontractile-esophagus-in-high-resolution-esophageal-manometry
#1
D Schupack, D A Katzka, D M Geno, K Ravi
BACKGROUND: Although major manometric abnormalities, the significance of esophagogastric junction outflow obstruction (EGJOO) and hypercontractile esophagus (HE) is poorly understood. We sought to determine long term outcomes for EGJOO and HE. METHODS: High-resolution impedance manometry (HRIM) studies conducted from 5/30/2012 to 8/1/2014 consistent with EGJOO and HE and normal studies from 5/30/12 to 11/1/12 were identified. Standardized follow up was conducted with a phone survey utilizing the impact dysphagia questionnaire (IDQ-10)...
May 23, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28544616/biochemical-isolation-of-myonuclei-employed-to-define-changes-to-the-myonuclear-proteome-that-occur-with-aging
#2
Alicia A Cutler, Eric B Dammer, Duc M Doung, Nicholas T Seyfried, Anita H Corbett, Grace K Pavlath
Skeletal muscle aging is accompanied by loss of muscle mass and strength. Examining changes in myonuclear proteins with age would provide insight into molecular processes which regulate these profound changes in muscle physiology. However, muscle tissue is highly adapted for contraction and thus comprised largely of contractile proteins making the nuclear proteins difficult to identify from whole muscle samples. By developing a method to purify myonuclei from whole skeletal muscle, we were able to collect myonuclei for analysis by flow cytometry, biochemistry, and mass spectrometry...
May 23, 2017: Aging Cell
https://www.readbyqxmd.com/read/28544569/maintenance-of-the-contractile-phenotype-in-corpus-cavernosum-smooth-muscle-cells-by-myocardin-gene-therapy-ameliorates-erectile-dysfunction-in-bilateral-cavernous-nerve-injury-rats
#3
H-B Zhang, Z-Q Wang, F-Z Chen, W Ding, W-B Liu, Z-R Chen, S-H He, A-Y Wei
The pathophysiology of erectile dysfunction post radical prostatectomy is not clearly clarified, and the low efficacy of traditional PDE5i treatment remains a major complaint in contemporary practice. This study aimed to demonstrate phenotypic modulation in bilateral cavernous nerve injury (BCNI) rats within 7 days, and subsequently validate gene therapy with Myocardin (Mycod) by maintaining a contractile phenotype in corpus cavernosum smooth muscle cells. Initially, 36 male rats were randomly divided into BCNI and negative control (NC) groups for histological and phenotypic molecular measurements at 3, 5, and 7 days...
May 23, 2017: Andrology
https://www.readbyqxmd.com/read/28544141/assessing-the-pre-and-postpeak-phases-in-a-swallow-using-esophageal-pressure-topography
#4
Y Xiao, D A Carlson, Z Lin, N Rinella, D Sifrim, J E Pandolfino
BACKGROUND: The current paradigm of measuring esophageal contractile vigor assesses the entirety of a pressure wave using a single measurement, the distal contractile integral (DCI). We hypothesize that an assessment identifying separate phases of the contractile pressure wave before and after the pressure peak may help distinguish abnormalities in patients presenting with chest pain and dysphagia. The aim of the present study was to develop a technique to assess the individual phases and report on the values in healthy controls...
May 22, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28543684/multiparity-modifies-contractile-properties-of-pelvic-muscles-affecting-the-genesis-of-vaginal-pressure-in-rabbits
#5
Rhode López-Juárez, René Zempoalteca, Dora Luz Corona-Quintanilla, Ismael Jiménez-Estrada, Francisco Castelán, Margarita Martínez-Gómez
AIMS: To characterize the contractile properties of the bulbospongiosus (Bsm), isquiocavernosus (Ism), and pubococcygeus muscles (Pcm), and their involvement in the genesis of vaginal pressure in nulliparous and multiparous rabbits. METHODS: Age-matched nulliparous and multiparous rabbits were used to record the isometric contractile responses of each muscle as well as the intravaginal pressure evoked by single square electrical pulses and stimulation trains of ascending frequency...
May 24, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28543352/effect-of-albiglutide-on-cholecystokinin-induced-gallbladder-emptying-in-healthy-individuals-a-randomized-crossover-study
#6
Bonnie C Shaddinger, Malcolm A Young, Julia Billiard, David A Collins, Azra Hussaini, Antonio Nino
The glucagon-like peptide-1 (GLP-1) receptor agonists (RAs) exenatide and lixisenatide reduce cholecystokinin (CCK)-induced gallbladder emptying in healthy subjects. It is unknown if all GLP-1 RAs share this effect; therefore, the effect of the GLP-1 RA albiglutide on gallbladder function was assessed. In this randomized, double-blind, 2-way crossover study, a single dose of subcutaneous albiglutide 50 mg or placebo was administered to 17 healthy subjects, and CCK-induced gallbladder contractility was measured by ultrasonography...
May 19, 2017: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28542339/bioenergetic-profile-of-human-coronary-artery-smooth-muscle-cells-and-effect-of-metabolic-intervention
#7
Mingming Yang, Amy E Chadwick, Caroline Dart, Tomoko Kamishima, John M Quayle
Bioenergetics of artery smooth muscle cells is critical in cardiovascular health and disease. An acute rise in metabolic demand causes vasodilation in systemic circulation while a chronic shift in bioenergetic profile may lead to vascular diseases. A decrease in intracellular ATP level may trigger physiological responses while dedifferentiation of contractile smooth muscle cells to a proliferative and migratory phenotype is often observed during pathological processes. Although it is now possible to dissect multiple building blocks of bioenergetic components quantitatively, detailed cellular bioenergetics of artery smooth muscle cells is still largely unknown...
2017: PloS One
https://www.readbyqxmd.com/read/28542204/similar-regulatory-mechanisms-of-caveolins-and-cavins-by-myocardin-family-coactivators-in-arterial-and-bladder-smooth-muscle
#8
Baoyi Zhu, Catarina Rippe, Tran Thi Hien, Jianwen Zeng, Sebastian Albinsson, Karin G Stenkula, Bengt Uvelius, Karl Swärd
Caveolae are membrane invaginations present at high densities in muscle and fat. Recent work has demonstrated that myocardin family coactivators (MYOCD, MKL1), which are important for contractile differentiation and cell motility, increase caveolin (CAV1, CAV2, CAV3) and cavin (CAVIN1, CAVIN2, CAVIN3) transcription, but several aspects of this control mechanism remain to be investigated. Here, using promoter reporter assays we found that both MKL1/MRTF-A and MKL2/MRTF-B control caveolins and cavins via their proximal promoter sequences...
2017: PloS One
https://www.readbyqxmd.com/read/28541681/platelet-microcapsule-hybrids-leverage-contractile-force-for-targeted-delivery-of-hemostatic-agents
#9
Caroline E Hansen, David R Myers, Wallace Hunter Baldwin, Yumiko Sakurai, Shannon L Meeks, L Andrew Lyon, Wilbur A Lam
We report a cell-mediated, targeted drug delivery system utilizing polyelectrolyte multilayer capsules that hybridize with the patient's own platelets upon intravenous administration. The hybridized platelets function as the sensor and actuator for targeted drug delivery and controlled release in our system. These capsules are biochemically and mechanically tuned to enable platelet adhesion and capsule rupture upon platelet activation and contraction, enabling the targeted and controlled "burst" release of an encapsulated biotherapeutic...
May 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/28540031/outgrowing-endothelial-and-smooth-muscle-cells-for-tissue-engineering-approaches
#10
Moritz Kolster, Mathias Wilhelmi, Claudia Schrimpf, Andres Hilfiker, Axel Haverich, Thomas Aper
In recent years, circulating progenitors of endothelial cells and smooth muscle cells were identified in the peripheral blood. In our study, we evaluated the utilization of both cell types isolated and differentiated from peripheral porcine blood in terms for their use for tissue engineering purposes. By means of density gradient centrifugation, the monocyte fraction from porcine blood was separated, split, and cultivated with specific culture media with either endothelial cell growth medium-2 or smooth muscle cell growth medium-2 for the differentiation of endothelial cells or smooth muscle cells...
January 2017: Journal of Tissue Engineering
https://www.readbyqxmd.com/read/28539832/recapitulating-and-correcting-marfan-syndrome-in-a-cellular-model
#11
Jung Woo Park, Li Yan, Chris Stoddard, Xiaofang Wang, Zhichao Yue, Leann Crandall, Tiwanna Robinson, Yuxiao Chang, Kyle Denton, Enqin Li, Bin Jiang, Zhenwu Zhang, Kristen Martins-Taylor, Siu-Pok Yee, Hong Nie, Feng Gu, Wei Si, Ting Xie, Lixia Yue, Ren-He Xu
Marfan syndrome (MFS) is a connective tissue disorder caused by mutations in FBN1 gene, which encodes a key extracellular matrix protein FIBRILLIN-1. The haplosufficiency of FBN1 has been implicated in pathogenesis of MFS with manifestations primarily in cardiovascular, muscular, and ocular tissues. Due to limitations in animal models to study the late-onset diseases, human pluripotent stem cells (PSCs) offer a homogeneic tool for dissection of cellular and molecular pathogenic mechanism for MFS in vitro. Here, we first derived induced PSCs (iPSCs) from a MFS patient with a FBN1 mutation and corrected the mutation, thereby generating an isogenic "gain-of-function" control cells for the parental MFS iPSCs...
2017: International Journal of Biological Sciences
https://www.readbyqxmd.com/read/28539457/mechanical-evidence-that-flamingos-can-support-their-body-on-one-leg-with-little-active-muscular-force
#12
Young-Hui Chang, Lena H Ting
Flamingos (Phoenicopteridae) often stand and sleep on one leg for long periods, but it is unknown how much active muscle contractile force they use for the mechanical demands of standing on one leg: body weight support and maintaining balance. First, we demonstrated that flamingo cadavers could passively support body weight on one leg without any muscle activity while adopting a stable, unchanging, joint posture resembling that seen in live flamingos. By contrast, the cadaveric flamingo could not be stably held in a two-legged pose, suggesting a greater necessity for active muscle force to stabilize two-legged versus one-legged postures...
May 2017: Biology Letters
https://www.readbyqxmd.com/read/28539404/analysis-of-interphase-node-proteins-in-fission-yeast-by-quantitative-and-super-resolution-fluorescence-microscopy
#13
Matthew Akamatsu, Yu Lin, Joerg Bewersdorf, Thomas D Pollard
We used quantitative confocal microscopy and FPALM super resolution microscopy of live fission yeast to investigate the structures and assembly of two types of interphase nodes, multiprotein complexes associated with the plasma membrane that merge together and mature into the precursors of the cytokinetic contractile ring. During the long G2 phase of the cell cycle seven different interphase node proteins maintain constant concentrations as they accumulate in proportion to cell volume. During mitosis the total numbers of type 1 node proteins (cell cycle kinases Cdr1p, Cdr2p, Wee1p, and anillin Mid1p) are constant even when the nodes disassemble...
May 24, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28538761/effects-of-continuous-and-accumulated-exercise-on-endothelial-function-in-rat-aorta
#14
Juliana Edwiges Martinez, Elane de Fátima Taipeiro, Agnaldo Bruno Chies
Background: The practice of exercise in short bouts repeated throughout the day may be an alternative strategy to lift people out of physical inactivity. Objective: to evaluate if accumulated exercise, as occurs in continuous exercise training, improve endothelial function in rat aorta. Methods: Wistar male rats were divided into three groups: continuous exercise (CEx, 1 hour on the treadmill) or accumulated exercise (AEx, 4 bouts of 15 minutes / day) for 5 days/week for 8 weeks, or sedentary (SED)...
April 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28538380/acute-effects-of-cinacalcet-on-arterial-stiffness-and-ventricular-function-in-hemodialysis-patients-a-randomized-double-blinded-crossover-study
#15
Aurélie Poulin, Pierre-Luc Bellemare, Catherine Fortier, Fabrice Mac-Way, Simon Desmeules, Karine Marquis, Valérie Gaudreault, Marcel Lebel, Mohsen Agharazii
BACKGROUND: Serum calcium concentration (Ca) plays an essential role in a vascular muscle tone and myocardial contractility. Previously, we showed that acutely lowering Ca by hemodialysis reduced arterial stiffness. Cinacalcet is a calcimimetic that lowers Ca and parathyroid hormone (PTH). The aim of the present study was to examine whether acute lowering of Ca by cinacalcet improves vascular stiffness and myocardial diastolic dysfunction. METHOD: This is a double-blinded randomized placebo-controlled crossover study that included 21 adult patients with end-stage kidney disease undergoing chronic hemodialysis...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28538312/skeletal-muscle-contraction-time-and-tone-decrease-after-8-weeks-of-plyometric-training
#16
Damir Zubac, Boštjan Šimunič
Zubac, D and Šimunič, B. Skeletal muscle contraction time and tone decrease after 8 weeks of plyometric training. J Strength Cond Res 31(6): 1610-1619, 2017-The aim of the study was to examine whether an improvement in jumping performance after 8 weeks of plyometric training (PT) runs in parallel with changes in lower-limb skeletal muscle contractile properties. Using noninvasive tensiomyography (TMG), we assessed contraction time (Tc) and the maximal amplitude of radial displacement (Dm) in 20 subjects (50% men; age 22...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28538157/cell-and-tissue-scale-forces-coregulate-fgfr2-dependent-tetrads-and-rosettes-in-the-mouse-embryo
#17
Jun Wen, Hirotaka Tao, Kimberly Lau, Haijiao Liu, Craig A Simmons, Yu Sun, Sevan Hopyan
What motivates animal cells to intercalate is a longstanding question that is fundamental to morphogenesis. A basic mode of cell rearrangement involves dynamic multicellular structures called tetrads and rosettes. The contribution of cell-intrinsic and tissue-scale forces to the formation and resolution of these structures remains unclear, especially in vertebrates. Here, we show that Fgfr2 regulates both the formation and resolution of tetrads and rosettes in the mouse embryo, possibly in part by spatially restricting atypical protein kinase C, a negative regulator of non-muscle myosin IIB...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28537978/intralipid-restoration-of-myocardial-contractions-following-bupivacaine-induced-asystole-concentration-and-time-dependence-in-vitro
#18
Wyun Kon Park, Hyun Soo Kim, Soo Hwan Kim, Ja Rang Jung, Carl Lynch, Nar Hyun Min
BACKGROUND: The concentration- and time-response relationships of lipid emulsion (LE; Intralipid) on the recovery of myocardial contractility following bupivacaine (BPV)-induced asystole are poorly defined. METHODS: After achieving asystole by 500-μM BPV, varied concentrations of LE were applied to determine the recovery of stimulated contractile responses and contractions in the cardiac tissues of guinea pigs at a 1.2-Hz stimulation rate. These experiments were performed with LE in either a recirculating (2%-16%) or washout (nonrecirculating) condition (0...
May 19, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28537220/patterned-cortical-tension-mediated-by-n-cadherin-controls-cell-geometric-order-in-the-drosophila-eye
#19
Eunice HoYee Chan, Pruthvi Chavadimane Shivakumar, Raphaël Clément, Edith Laugier, Pierre-François Lenne
Adhesion molecules hold cells together but also couple cell membranes to a contractile actomyosin network, which limits the expansion of cell contacts. Despite their fundamental role in tissue morphogenesis and tissue homeostasis, how adhesion molecules control cell shapes and cell patterns in tissues remains unclear. Here we address this question in vivo using the Drosophila eye. We show that cone cell shapes depend little on adhesion bonds and mostly on contractile forces. However, N-cadherin has an indirect control on cell shape...
May 24, 2017: ELife
https://www.readbyqxmd.com/read/28536755/taurine-protects-cardiac-contractility-in-killifish-fundulus-heteroclitus-by-enhancing-sarcoplasmic-reticular-ca-2-cycling
#20
Elenor F Henry, Tyson J MacCormack
Intracellular taurine is abundant in many animals and it influences an array of physiological processes, including osmoregulation, metabolism, and cardiac contractility. Taurine is an important osmolyte in teleost hearts, but its role in stress tolerance, cardiac metabolism, and contractility has not been assessed. The goal of this study was to determine if ventricular taurine concentration changes in response to environmental stress and to characterize its influence on contractility. Cardiac taurine concentrations varied in killifish (Fundulus heteroclitus) but were generally maintained following acute environmental challenges...
May 23, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
keyword
keyword
85506
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"