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https://www.readbyqxmd.com/read/28821950/the-effects-of-supramaximal-versus-submaximal-intensity-eccentric-training-when-performed-until-volitional-fatigue
#1
Joel R Krentz, Philip D Chilibeck, Jonathan P Farthing
PURPOSE: Our purpose was to compare supramaximal versus submaximal intensity eccentric training performed until volitional fatigue. METHODS: Thirty-two young adults (19 males) were randomized into one of three groups: (1) ECC110 performed eccentric (ECC) only contractions at 110% of concentric (CON) 1-repetition maximum (1RM); (2) ECC80 performed ECC only contractions at 80% of CON 1RM; (3) a control group. Training progressed from 3 to 6 sets of unilateral ECC training of the elbow flexors over 8 weeks, with each set performed until volitional fatigue...
August 18, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28821742/rock-1-mediates-diabetes-induced-retinal-pigment-epithelial-and-endothelial-cell-blebbing-contribution-to-diabetic-retinopathy
#2
Pierre-Raphaël Rothschild, Sawsen Salah, Marianne Berdugo, Emmanuelle Gélizé, Kimberley Delaunay, Marie-Christine Naud, Christophe Klein, Alexandre Moulin, Michèle Savoldelli, Ciara Bergin, Jean-Claude Jeanny, Laurent Jonet, Yvan Arsenijevic, Francine Behar-Cohen, Patricia Crisanti
In diabetic retinopathy, the exact mechanisms leading to retinal capillary closure and to retinal barriers breakdown remain imperfectly understood. Rho-associated kinase (ROCK), an effector of the small GTPase Rho, involved in cytoskeleton dynamic regulation and cell polarity is activated by hyperglycemia. In one year-old Goto Kakizaki (GK) type 2 diabetic rats retina, ROCK-1 activation was assessed by its cellular distribution and by phosphorylation of its substrates, MYPT1 and MLC. In both GK rat and in human type 2 diabetic retinas, ROCK-1 is activated and associated with non-apoptotic membrane blebbing in retinal vessels and in retinal pigment epithelium (RPE) that respectively form the inner and the outer barriers...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821447/time-perception-pacing-and-exercise-intensity-maximal-exercise-distorts-the-perception-of-time
#3
A M Edwards, A McCormick
INTRODUCTION: Currently there are no data examining the impact of exercise on the perception of time which is surprising as optimal competitive performance is dependent on accurate pacing using knowledge of time elapsed. METHODS: With institutional ethics approval, 12 recreationally active adult participants (f=7, m=5) undertook both 30s Wingate cycles and 20min (1200s) rowing ergometer bouts as short and long duration self-paced exercise trials, in each of three conditions on separate occasions: 1) light exertion: RPE 11, 2) heavy exertion: RPE 15, 3) maximal exertion: RPE 20...
August 15, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28820332/using-rating-of-perceived-exertion-in-assessing-cardiorespiratory-fitness-in-endometrial-cancer-survivors
#4
Daniel C Hughes, Matthew G Cox, Susan Serice, George Baum, Carol Harrison, Karen Basen-Engquist
For cancer survivors, who also often present with co-existing health conditions, exercise testing is often performed using submaximal protocols incorporating linear heart rate response for estimating the cardiorespiratory capacity and assessing exercise tolerance. However, use of beta-blocker medications, during sub-maximal protocols based on linear HR response can be problematic. Rating of perceived exertion (RPE), which takes into account an individual's overall perception of effort, can be used as a complementary tool that does not rely solely on the heart rate response to increased workload...
October 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28820183/technique-of-retinal-gene-therapy-delivery-of-viral-vector-into-the-subretinal-space
#5
K Xue, M Groppe, A P Salvetti, R E MacLaren
PurposeSafe and reproducible delivery of gene therapy vector into the subretinal space is essential for successful targeting of the retinal pigment epithelium (RPE) and photoreceptors. The success of surgery is critical for the clinical efficacy of retinal gene therapy. Iatrogenic detachment of the degenerate (often adherent) retina in patients with hereditary retinal degenerations and small volume (eg, 0.1 ml) subretinal injections pose new surgical challenges.MethodsOur subretinal gene therapy technique involved pre-operative planning with optical coherence tomography (OCT) and autofluorescence (AF) imaging, 23 G pars plana vitrectomy, internal limiting membrane staining with Membrane Blue Dual (DORC BV, Zuidland, Netherlands), a two-step subretinal injection using a 41 G Teflon tipped cannula (DORC) first with normal saline to create a parafoveal bleb followed by slow infusion of viral vector via the same self-sealing retinotomy...
August 18, 2017: Eye
https://www.readbyqxmd.com/read/28820157/incidence-outcomes-and-risk-factors-for-hemorrhagic-complications-in-eyes-with-polypoidal-choroidal-vasculopathy-following-photodynamic-therapy-in-indian-subjects
#6
Pukhraj Rishi, Ekta Rishi, Minal Sharma, Aditya Maitray, Muna Bhende, Lingam Gopal, Tarun Sharma, Dhanashree Ratra, Parveen Sen, Pramod Bhende, Chetan Rao, Pradeep Susvar
PURPOSE: To evaluate the incidence, outcomes, and risk factors for hemorrhagic complications in eyes with polypoidal choroidal vasculopathy (PCV) following photodynamic therapy (PDT). METHODS: Medical records of 94 eyes of 86 consecutive patients with PCV who underwent PDT between January 2007 and December 2014 were retrospectively reviewed. The diagnosis of PCV was based on clinical features and indocyanine green angiography. Eyes were treated with PDT monotherapy or a combination of PDT plus anti-vascular endothelial growth factor...
August 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/28817661/ouabain-affects-cell-migration-via-na-k-atpase-p130cas-and-via-nucleus-centrosome-association
#7
Young Ou, Chen Xuan Pan, Jeremy Zuo, Frans A van der Hoorn
Na,K-ATPase is a membrane protein that catalyzes ATP to maintain transmembrane sodium and potassium gradients. In addition, Na,K-ATPase also acts as a signal-transducing receptor for cardiotonic steroids such as ouabain and activates a number of signalling pathways. Several studies report that ouabain affects cell migration. Here we used ouabain at concentrations far below those required to block Na,K-ATPase pump activity and show that it significantly reduced RPE cell migration through two mechanisms. It causes dephosphorylation of a 130 kD protein, which we identify as p130cas...
2017: PloS One
https://www.readbyqxmd.com/read/28817343/suppression-of-choroidal-neovascularization-in-mice-by-subretinal-delivery-of-multigenic-lentiviral-vectors-encoding-anti-angiogenic-micrornas
#8
Anne Louise Askou, Josephine Natalia Esther Benckendorff, Andreas Holmgaard, Tina Storm, Lars Aagaard, Toke Bek, Jacob Giehm Mikkelsen, Thomas Juhl Corydon
Lentivirus-based vectors have been used for the development of potent gene therapies. Here, application of a multigenic lentiviral vector (LV) producing multiple anti-angiogenic microRNAs following subretinal delivery in a laser-induced choroidal neovascularization (CNV) mouse model is presented. This versatile LV, carrying back-to-back RNApolII-driven expression cassettes, enables combined expression of microRNAs targeting vascular endothelial growth factor A (Vegfa) mRNA and fluorescent reporters. In addition, by including a vitelliform macular dystrophy 2 (VMD2) promoter, expression of microRNAs is restricted to the retinal pigment epithelial (RPE) cells...
August 2017: Human Gene Therapy Methods
https://www.readbyqxmd.com/read/28815590/juxtanodin-in-retinal-pigment-epithelial-cells-expression-and-biological-activities-in-regulating-cell-morphology-and-actin-cytoskeleton-organization
#9
Fengyi Liang, Ji Hyun Hwang, Nicholas Weiwei Tang, Walter Hunziker
Juxtanodin (also known as ermin) was initially identified as an actin cytoskeleton-related oligodendroglial protein in the rat central nervous system. It was subsequently also found in the rat olfactory neuroepithelium, especially at the apical junctional belt of the sustentacular cells. We further examined juxtanodin expression and functional roles in the retina using fluorescence histochemistry, confocal microscopy, immuno-electron microscopy, molecular biology and cell culture. Prominent juxtanodin expression was found in the photoreceptor-supporting retinal pigment epithelium (RPE), especially in a zone corresponding to the apices of RPE cells, at the roots of the RPE microvilli, and at the base of RPE cells next to the Bruch's membrane...
August 17, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28814984/protective-mechanisms-of-the-mitochondrial-derived-peptide-humanin-in-oxidative-and-endoplasmic-reticulum-stress-in-rpe-cells
#10
REVIEW
Leonid Minasyan, Parameswaran G Sreekumar, David R Hinton, Ram Kannan
Age-related macular degeneration (AMD) is the leading cause of severe and irreversible vision loss and is characterized by progressive degeneration of the retina resulting in loss of central vision. The retinal pigment epithelium (RPE) is a critical site of pathology of AMD. Mitochondria and the endoplasmic reticulum which lie in close anatomic proximity to each other are targets of oxidative stress and endoplasmic reticulum (ER) stress, respectively, and contribute to the progression of AMD. The two organelles exhibit close interactive function via various signaling mechanisms...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28814744/monocyte-infiltration-and-proliferation-reestablish-myeloid-cell-homeostasis-in-the-mouse-retina-following-retinal-pigment-epithelial-cell-injury
#11
Wenxin Ma, Yikui Zhang, Chun Gao, Robert N Fariss, Johnny Tam, Wai T Wong
Age-related macular degeneration (AMD), a leading contributor of vision loss, currently lacks comprehensive treatment. While AMD histopathology involves retinal pigment epithelium (RPE) injury associated with immune cell infiltration, the nature of immune cell responses to RPE injury remains undefined. We induced RPE injury pharmacologically and genetically in transgenic mouse models in which microglia and systemic monocytes were separately tagged, enabling a spatial and temporal dissection of the relative contributions of microglia vs...
August 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811749/acute-cocoa-flavanols-intake-has-minimal-effects-on-exercise-induced-oxidative-stress-and-nitric-oxide-production-in-healthy-cyclists-a-randomized-controlled-trial
#12
Lieselot Decroix, Cajsa Tonoli, Danusa Dias Soares, Amandine Descat, Marie-José Drittij-Reijnders, Antje R Weseler, Aalt Bast, Wilhelm Stahl, Elsa Heyman, Romain Meeusen
BACKGROUND: Cocoa flavanols (CF) can stimulate vasodilation by improved nitric oxide (NO) synthesis and have antioxidant and anti-inflammatory capacities. This study aimed to examine whether acute CF intake can affect exercise-induced changes in antioxidant capacity, oxidative stress, inflammation and NO production, as well as exercise performance and recovery in well-trained cyclists. METHODS: Twelve well-trained male cyclists (mean ± SD age, VO2max: 30 ± 3 years, 63...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28811571/identification-of-a-gene-encoding-slow-skeletal-muscle-troponin-t-as-a-novel-marker-for-immortalization-of-retinal-pigment-epithelial-cells
#13
Takuya Kuroda, Satoshi Yasuda, Hiroyuki Nakashima, Nozomi Takada, Satoko Matsuyama, Shinji Kusakawa, Akihiro Umezawa, Akifumi Matsuyama, Shin Kawamata, Yoji Sato
Human pluripotent stem cells (hPSCs) are leading candidate raw materials for cell-based therapeutic products (CTPs). In the development of hPSC-derived CTPs, it is imperative to ensure that they do not form tumors after transplantation for safety reasons. Because cellular immortalization is a landmark of malignant transformation and a common feature of cancer cells, we aimed to develop an in vitro assay for detecting immortalized cells in CTPs. We employed retinal pigment epithelial (RPE) cells as a model of hPSC-derived products and identified a gene encoding slow skeletal muscle troponin T (TNNT1) as a novel marker of immortalized RPE cells by comprehensive microarray analysis...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811362/nuclear-envelope-rupture-is-enhanced-by-loss-of-p53-or-rb
#14
Zhe Yang, John Maciejowski, Titia de Lange
The mammalian nuclear envelope (NE) forms a stable physical barrier between the nucleus and the cytoplasm, normally breaking down only during the cell cycle phase of mitosis. However, spontaneous transient NE rupture in interphase can occur when NE integrity is compromised such as when the nucleus experiences mechanical stress. For instance, deficiencies in the nuclear lamins and their associated proteins can cause NE rupture that is promoted by forces exerted by actin filaments. NE rupture can allow cytoplasmic nucleases to access chromatin, potentially compromising genome integrity...
August 15, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28811361/chemoradiotherapy-resistance-in-colorectal-cancer-cells-is-mediated-by-wnt-%C3%AE-catenin-signaling
#15
Georg Emons, Melanie Spitzner, Sebastian Reineke, Janneke Möller, Noam Auslander, Frank Kramer, Yue Hu, Tim Beissbarth, Hendrik A Wolff, Margret Rave-Fränk, Elisabeth Heßmann, Jochen Gaedcke, B Michael Ghadimi, Steven Johnsen, Thomas Ried, Marian Grade
Activation of Wnt/β-catenin signaling plays a central role in the development and progression of colorectal cancer (CRC). The Wnt-transcription factor, TCF7L2, is overexpressed in primary rectal cancers that are resistant to chemoradiotherapy (CRT) and TCF7L2 mediates resistance to CRT. However, it is unclear whether the resistance is mediated by a TCF7L2 inherent mechanism or Wnt/β-catenin signaling in general. Here, inhibition of β-catenin by siRNAs or a small molecule inhibitor (XAV-939) resulted in sensitization of CRC cells to CRT...
August 15, 2017: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/28810265/viral-retinopathy-in-experimental-models-of-zika-infection
#16
Zhenyang Zhao, Matthew Yang, Sasha R Azar, Lynn Soong, Scott C Weaver, Jiaren Sun, Yan Chen, Shannan L Rossi, Jiyang Cai
Purpose: Emerging evidence has shown that both congenital and adult Zika virus (ZIKV) infection can cause eye diseases. The goals of the current study were to explore mechanisms and pathophysiology of ZIKV-induced eye defects. Methods: Wild-type or A129 interferon type I receptor-deficient mice were infected by either FSS13025 or Mex1-7 strain of ZIKV. Retinal histopathology was measured at different time points after infection. The presence of viral RNA and protein in the retina was determined by in situ hybridization and immunofluorescence staining, respectively...
August 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28800962/contacting-co-culture-of-human-retinal-microvascular-endothelial-cells-alters-barrier-function-of-human-embryonic-stem-cell-derived-retinal-pigment-epithelial-cells
#17
H Skottman, J Muranen, H Lähdekorpi, E Pajula, K Mäkelä, L Koivusalo, A Koistinen, H Uusitalo, K Kaarniranta, K Juuti-Uusitalo
Here we evaluated the effects of human retinal microvascular endothelial cells (hREC) on mature human embryonic stem cell (hESC) derived retinal pigment epithelial (RPE) cells. The hESC-RPE cells (Regea08/017, Regea08/023 or Regea11/013) and hREC (ACBRI 181) were co-cultured on opposite sides of transparent membranes for up to six weeks. Thereafter barrier function, small molecule permeability, localization of RPE and endothelial cell marker proteins, cellular fine structure, and growth factor secretion of were evaluated...
August 8, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28797622/relationships-between-respiratory-parameters-exercise-capacity-and-psychosocial-factors-in-people-with-chronic-obstructive-pulmonary-disease
#18
T O Awotidebe, O F Awopeju, L A Bisiriyu, R N Ativie, K I Oke, R A Adedoyin, O D Olusola, G E Erhabor
BACKGROUND: Chronic obstructive pulmonary disease (COPD) affects respiratory functioning and psychosocial factors. However, little is known about perceived ability of people with COPD to engage in a regular exercise program. This study assessed respiratory parameters, exercise capacity, psychosocial factors and their relations in people with COPD. METHODS: This cross-sectional study involved patients with COPD recruited from a Nigerian university teaching hospital...
August 7, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28796562/loss-of-endothelial-planar-cell-polarity-and-cellular-clearance-mechanisms-in-age-related-macular-degeneration
#19
Maria Mercedes Campos, Mones S Abu-Asab
Apoptosis, autophagosomes, and lysosomes are lacking in the retinal pigment epithelium (RPE) of age-related macular degeneration (AMD) eyes. Necrosis, not apoptosis, appeared to be the prominent type of cell death in RPE, which led to the accumulation of cell debris within and on both sides of Bruch's membrane. The endothelium of the choriocapillaris had an altered planar cell polarity which encompassed the disappearance of fenestrations, the thickening of cytoplasm, and anterior nuclear dislocation. There were no significant differences in RPE and choroidal aberrations between macular and temporal regions...
August 10, 2017: Ultrastructural Pathology
https://www.readbyqxmd.com/read/28796130/the-effects-of-superset-configuration-on-kinetic-kinematic-and-perceived-exertion-in-the-barbell-bench-press
#20
Jonathon Js Weakley, Kevin Till, Dale B Read, Padraic J Phibbs, Gregory Roe, Joshua Darrall-Jones, Ben L Jones
Training that is efficient and effective is of great importance to an athlete. One method of improving efficiency is by incorporating supersets into resistance training routines. However, the structuring of supersets is still unexplored. Therefore, the purpose of this study was to assess the effects of agonist-antagonist (A-A), alternate peripheral (A-P), and similar biomechanical (SB) superset configurations on rate of perceived exertion (RPE), kinetic and kinematic changes during the bench press. 10 subjects performed resistance training protocols in a randomized-crossover design, with magnitude-based inferences assessing changes/differences within and between protocols...
August 4, 2017: Journal of Strength and Conditioning Research
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