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https://www.readbyqxmd.com/read/28414914/designing-uniquely-addressable-bio-orthogonal-synthetic-scaffolds-for-dna-and-rna-origami
#1
Jerzy W Kozyra, Alessandro Ceccarelli, Emanuela Torelli, Annunziata Lopiccolo, Jing-Ying Gu, Harold Fellermann, Ulrich Stimming, Natalio Krasnogor
Nanotechnology and synthetic biology are rapidly converging, with DNA origami being one of the leading bridging technologies. DNA origami was shown to work well in a wide array of biotic environments. However, the large majority of extant DNA origami scaffolds utilize bacteriophages or plasmid sequences thus severely limiting its future applicability as bio-orthogonal nanotechnology platform. In this paper we present the design of biologically inert (i.e. "bio-orthogonal") origami scaffolds. The synthetic scaffolds have the additional advantage of being uniquely addressable (unlike biologically derived ones) and hence are better optimised for high-yield folding...
April 17, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28377899/certain-less-invasive-infertility-treatments-associated-with-different-levels-of-pregnancy-related-anxiety-in-pregnancies-conceived-via-in-vitro-fertilization
#2
Eleanor Lowndes Stevenson, Richard Sloane
BACKGROUND: Research supports that in vitro fertilization causes anxiety and that anxiety can continue into the resulting pregnancy. Most women who have IVF will have a less invasive treatment for infertility prior to IVF; however, it is unclear if specific less invasive treatment cycles impact anxiety that is experienced in the pregnancy resulting from IVF. METHODS: A prospective study was conducted for women who became pregnant via IVF, and data was collected about reported previous non-IVF treatment cycles as well as Pregnancy Related Anxiety Measure...
January 2017: Journal of Reproduction & Infertility
https://www.readbyqxmd.com/read/28375357/wafer-scale-arrays-of-high-q-silica-optical-microcavities
#3
Erol Ozgur, Ersin Huseyinoglu, Aykutlu Dana
On-chip high-Q microcavities possess significant potential in terms of integration of optical microresonators into functional optoelectronic devices that could be used in various applications, including biosensors, photonic-integrated circuits, or quantum optics experiments. Yet, despite the convenience of fabricating wafer-scale integrated microresonators with moderate Q values using standard microfabrication techniques, surface-tension-induced microcavities (STIMs), which have atomic-level surface roughness enabling the observation of Q values larger than 10<sup>6</sup>, could only be produced using individual thermal treatment of every single microresonator within the devised area...
March 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28360224/ultrasound-evaluation-of-diaphragm-function-in-mechanically-ventilated-patients-comparison-to-phrenic-stimulation-and-prognostic-implications
#4
Bruno-Pierre Dubé, Martin Dres, Julien Mayaux, Suela Demiri, Thomas Similowski, Alexandre Demoule
RATIONALE: In intensive care unit (ICU) patients, diaphragm dysfunction is associated with adverse clinical outcomes. Ultrasound measurements of diaphragm thickness, excursion (EXdi) and thickening fraction (TFdi) are putative estimators of diaphragm function, but have never been compared with phrenic nerve stimulation. Our aim was to describe the relationship between these variables and diaphragm function evaluated using the change in endotracheal pressure after phrenic nerve stimulation (Ptr,stim), and to compare their prognostic value...
March 30, 2017: Thorax
https://www.readbyqxmd.com/read/28345955/smoking-dependent-distal-to-proximal-repatterning-of-the-adult-human-small-airway-epithelium
#5
Jing Yang, Wu-Lin Zuo, Tomoya Fukui, IonWa Chao, Kazunori Gomi, Busub Lee, Michelle R Staudt, Robert J Kaner, Yael Strulovici-Barel, Jacqueline Salit, Ronald G Crystal, Renat Shaykhiev
RATIONALE: Small airways are the primary site of pathologic changes in chronic obstructive pulmonary disease (COPD), the major smoking-induced lung disorder. OBJECTIVES: Based on the concept of proximal-distal patterning that determines regional specialization of the airway epithelium during lung development, we hypothesized that a similar program operates in the adult human lung being altered by smoking leading to decreased regional identity of the small airway epithelium (SAE)...
March 27, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28247021/store-operated-calcium-entry-is-essential-for-glial-calcium-signalling-in-cns-white-matter
#6
M Papanikolaou, A Lewis, A M Butt
'Calcium signalling' is the ubiquitous response of glial cells to multiple extracellular stimuli. The primary mechanism of glial calcium signalling is by release of calcium from intracellular stores of the endoplasmic reticulum (ER). Replenishment of ER Ca(2+) stores relies on store-operated calcium entry (SOCE). However, despite the importance of calcium signalling in glial cells, little is known about their mechanisms of SOCE. Here, we investigated SOCE in glia of the mouse optic nerve, a typical CNS white matter tract that comprises bundles of myelinated axons and the oligodendrocytes and astrocytes that support them...
February 28, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28243166/orai1-and-orai3-in-combination-with-stim1-mediate-the-majority-of-store-operated-calcium-entry-in-astrocytes
#7
Jea Kwon, Heeyoung An, Moonsun Sa, Joungha Won, Jeong Im Shin, C Justin Lee
Astrocytes are non-excitable cells in the brain and their activity largely depends on the intracellular calcium (Ca(2+)) level. Therefore, maintaining the intracellular Ca(2+) homeostasis is critical for proper functioning of astrocytes. One of the key regulatory mechanisms of Ca(2+) homeostasis in astrocytes is the store-operated Ca(2+) entry (SOCE). This process is mediated by a combination of the Ca(2+)-store-depletion-sensor, Stim, and the store-operated Ca(2+)-channels, Orai and TrpC families. Despite the existence of all those families in astrocytes, previous studies have provided conflicting results on the molecular identification of astrocytic SOCE...
February 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/28230569/procedure-oriented-torsional-anatomy-of-the-hand-for-spasticity-injection
#8
Joslyn John, John Cianca, Faye Chiou-Tan, Sindhu Pandit, Erin Furr-Stimming, Katherine H Taber
OBJECTIVES: To provide musculoskeletal ultrasound (MSKUS) images of hand anatomy in the position of hemiparetic flexion as a reference for spasticity injections. After a stroke, spasticity can result in anatomic distortion of the hand. Spasticity may require treatment with botulinum toxin or phenol injections. Anatomic distortion may decrease the accuracy of injections. Standard anatomic references are of limited utility because they are not in this spastic hemiparetic position. There presently is no anatomic reference in the literature for these spastic postures...
March 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28229937/high-definition-transcranial-direct-current-stimulation-to-both-primary-motor-cortices-improves-unimanual-and-bimanual-dexterity
#9
Nils H Pixa, Fabian Steinberg, Michael Doppelmayr
While most research on brain stimulation with transcranial direct current stimulation (tDCS) targets unimanual motor tasks, little is known about its effects on bimanual motor performance. This study aims to investigate the effects of tDCS on unimanual as well as bimanual motor dexterity. We examined the effects of bihemispheric anodal high-definition tDCS (HD-atDCS) on both primary motor cortices (M1) applied concurrent with unimanual and bimanual motor training. We then measured the effects with the Purdue Pegboard Test (PPT) and compared them to a sham stimulation...
March 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28222911/store-operated-ca-2-entry-is-not-required-for-fertilization-induced-ca-2-signaling-in-mouse-eggs
#10
Miranda L Bernhardt, Elizabeth Padilla-Banks, Paula Stein, Yingpei Zhang, Carmen J Williams
Repetitive oscillations in cytoplasmic Ca(2+) due to periodic Ca(2+) release from the endoplasmic reticulum (ER) drive mammalian embryo development following fertilization. Influx of extracellular Ca(2+) to support the refilling of ER stores is required for sustained Ca(2+) oscillations, but the mechanisms underlying this Ca(2+) influx are controversial. Although store-operated Ca(2+) entry (SOCE) is an appealing candidate mechanism, several groups have arrived at contradictory conclusions regarding the importance of SOCE in oocytes and eggs...
February 11, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28219928/mitochondria-control-store-operated-ca-2-entry-through-na-and-redox-signals
#11
Tsipi Ben-Kasus Nissim, Xuexin Zhang, Assaf Elazar, Soumitra Roy, Judith A Stolwijk, Yandong Zhou, Rajender K Motiani, Maxime Gueguinou, Nadine Hempel, Michal Hershfinkel, Donald L Gill, Mohamed Trebak, Israel Sekler
Mitochondria exert important control over plasma membrane (PM) Orai1 channels mediating store-operated Ca(2+) entry (SOCE). Although the sensing of endoplasmic reticulum (ER) Ca(2+) stores by STIM proteins and coupling to Orai1 channels is well understood, how mitochondria communicate with Orai1 channels to regulate SOCE activation remains elusive. Here, we reveal that SOCE is accompanied by a rise in cytosolic Na(+) that is critical in activating the mitochondrial Na(+)/Ca(2+) exchanger (NCLX) causing enhanced mitochondrial Na(+) uptake and Ca(2+) efflux...
March 15, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28175299/inhibiting-sphingosine-kinase-2-mitigates-mutant-huntingtin-induced-neurodegeneration-in-neuron-models-of-huntington-disease
#12
Jose F Moruno-Manchon, Ndidi-Ese Uzor, Maria P Blasco-Conesa, Sishira Mannuru, Nagireddy Putluri, Erin E Furr-Stimming, Andrey S Tsvetkov
Huntington disease (HD) is the most common inherited neurodegenerative disorder. It has no cure. The protein huntingtin causes HD, and mutations to it confer toxic functions to the protein that lead to neurodegeneration. Thus, identifying modifiers of mutant huntingtin-mediated neurotoxicity might be a therapeutic strategy for HD. Sphingosine kinases 1 (SK1) and 2 (SK2) synthesize sphingosine-1-phosphate (S1P), a bioactive lipid messenger critically involved in many vital cellular processes, such as cell survival...
April 1, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28174113/involvement-of-glun2b-subunit-containing-n-methyl-d-aspartate-nmda-receptors-in-mediating-the-acute-and-chronic-synaptotoxic-effects-of-oligomeric-amyloid-beta-a%C3%AE-in-murine-models-of-alzheimer-s-disease-ad
#13
Gerhard Rammes, Corinna Mattusch, Matthias Wulff, Franziska Seeser, Matthias Kreuzer, Kaichuan Zhu, Jan M Deussing, Jochen Herms, Chris G Parsons
To elucidate whether a permanent reduction of the GluN2B subunit affects the pathology of Alzheimer's disease (AD), we cross-bred mice heterozygous for GluN2B receptors in the forebrain (hetGluN2B) with a mouse model for AD carrying a mutated amyloid precursor protein with the Swedish and Arctic mutation (mAPP) resulting in a hetGluN2B/mAPP transgenic. By means of voltage-sensitive dye imaging (VSDI) in the di-synaptic hippocampal pathway and the recording of field excitatory postsynaptic potentials (fEPSPs), hippocampal slices of all genotypes (WT, hetGluN2B, mAPP and hetGluN2B/mAPP, age 9-18 months) were tested for spatiotemporal activity propagation and LTP induction...
February 4, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28155613/functional-upregulation-of-stim-1-orai-1-mediated-store-operated-ca2-contributing-to-the-hypertension-development-elicited-by-chronic-etoh-consumption
#14
Guilherme Henrique Souza Bomfim, Iago Méndez-López, Juan Alberto Arranz-Tagarro, Adriana Aparecida Ferraz Carbonel, Danilo Roman-Campos, Juan Fernando Padín, Antonio García García, Aron Jurkiewicz, Neide Hyppolito Jurkiewicz
Chronic ethanol (EtOH) consumption has been associated with deleterious effects on the cardiovascular system by abnormal calcium (Ca²⁺) handling. Store-operated Ca2+ entry (SOCE) is related to cardiovascular remodeling which leads to the hypertension development, and the coupling between STIM-1 (ER Ca2+ sensor) and Orai-1 (channel pore) is a key mechanism to control SOCE through of store-operated Ca2+ channels (SOCCs). However, the role of STIM-1/Orai-1-mediated SOCE and its cross-talk with EtOH-triggered vascular remodeling and hypertension remain poorly understood...
February 1, 2017: Current Vascular Pharmacology
https://www.readbyqxmd.com/read/28131984/crispr-cas-induced-mutants-identify-a-requirement-for-dstim-in-larval-dopaminergic-cells-of-drosophila-melanogaster
#15
Trayambak Pathak, Deepti Trivedi, Gaiti Hasan
Molecular components of store-operated calcium entry have been identified in the recent past and consist of the endoplasmic reticulum (ER) membrane-resident calcium sensor STIM and the plasma membrane-localized calcium channel Orai. The physiological function of STIM and Orai is best defined in vertebrate immune cells. However, genetic studies with RNAi strains in Drosophila suggest a role in neuronal development and function. We generated a CRISPR-Cas-mediated deletion for the gene encoding STIM in Drosophila (dSTIM), which we demonstrate is larval lethal...
March 10, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28108030/pore-opening-mechanism-of-crac-channels
#16
REVIEW
Priscilla S-W Yeung, Megumi Yamashita, Murali Prakriya
Three decades ago, James W. Putney Jr. conceptualized the idea of store-operated calcium entry (SOCE) to explain how depletion of endoplasmic reticulum (ER) Ca(2+) stores evokes Ca(2+) influx across the plasma membrane. Since the publication of this highly influential idea, it is now established that SOCE is universal among non-excitable and probably even many types of excitable cells, and contributes to numerous effector functions impacting immunity, muscle contraction, and brain function. The molecules encoding SOCE, the STIM and Orai proteins, are now known and our understanding of how this pathway is activated in response to ER Ca(2+) store depletion has advanced significantly...
December 23, 2016: Cell Calcium
https://www.readbyqxmd.com/read/28105751/stim-1-and-orai-1-channel-mediate-angiotensin-ii-induced-expression-of-egr-1-in-vascular-smooth-muscle-cells
#17
Estelle R Simo-Cheyou, Ju Jing Tan, Ryszard Grygorczyk, Ashok K Srivastava
An upregulation of Egr-1 expression has been reported in models of atherosclerosis and intimal hyperplasia and, various vasoactive peptides and growth promoting stimuli have been shown to induce the expression of Egr-1 in vascular smooth muscle cells (VSMC). Angiotensin-II (Ang-II) is a key vasoactive peptide that has been implicated in the pathogenesis of vascular diseases. Ang-II elevates intracellular Ca(2+) through activation of the store-operated calcium entry (SOCE) involving an inositol-3-phosphate receptor (IP3R)-coupled depletion of endoplasmic reticular Ca(2+) and a subsequent activation of the stromal interaction molecule 1 (STIM-1)/Orai-1 complex...
January 20, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28091628/in-situ-x-ray-absorption-near-edge-structure-studies-and-charge-transfer-kinetics-of-na6-v10o28-electrodes
#18
Han-Yi Chen, Jochen Friedl, Chun-Jern Pan, Ali Haider, Rami Al-Oweini, Yan Ling Cheah, Ming-Hsien Lin, Ulrich Kortz, Bing-Joe Hwang, Madhavi Srinivasan, Ulrich Stimming
Polyoxometalates (POMs) have been reported as promising electrode materials for energy storage applications due to their ability to undergo fast redox reactions with multiple transferred electrons per polyanion. Here we employ a polyoxovanadate salt, Na6[V10O28], as an electrode material in a lithium-ion containing electrolyte and investigate the electron transfer properties of Na6[V10O28] on long and short timescales. Looking at equilibrated systems, in situ V K-edge X-ray absorption near edge structure (XANES) studies show that all 10 V(5+) ions in Na6[V10O28] can be reversibly reduced to V(4+) in a potential range of 4-1...
January 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28087079/the-stim-orai-coupling-interface-and-gating-of-the-orai1-channel
#19
REVIEW
Yandong Zhou, Xiangyu Cai, Robert M Nwokonko, Natalia A Loktionova, Youjun Wang, Donald L Gill
In virtually all cells, store-operated Ca(2+) entry signals are vital in controlling a spectrum of functions. The signals are mediated by STIM proteins in the ER and Orai channels in the PM which undergo a dynamic coupling process within discrete ER-PM junctional regions. This coupling is initiated by depletion of ER stored Ca(2+) triggering STIM proteins to undergo an intricate activation process. Thereafter, STIM proteins become trapped in the ER-PM junctions where they tether and gate PM Orai Ca(2+) channels...
January 8, 2017: Cell Calcium
https://www.readbyqxmd.com/read/27941645/pathophysiological-significance-of-store-operated-calcium-entry-in-megakaryocyte-function-opening-new-paths-for-understanding-the-role-of-calcium-in-thrombopoiesis
#20
REVIEW
Christian A Di Buduo, Alessandra Balduini, Francesco Moccia
Store-Operated Calcium Entry (SOCE) is a universal calcium (Ca(2+)) influx mechanism expressed by several different cell types. It is now known that Stromal Interaction Molecule (STIM), the Ca(2+) sensor of the intracellular compartments, together with Orai and Transient Receptor Potential Canonical (TRPC), the subunits of Ca(2+) permeable channels on the plasma membrane, cooperate in regulating multiple cellular functions as diverse as proliferation, differentiation, migration, gene expression, and many others, depending on the cell type...
December 8, 2016: International Journal of Molecular Sciences
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