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https://www.readbyqxmd.com/read/29352733/localization-of-palmitoylated-and-activated-g-protein-%C3%AE-subunit-in-dictyostelium-discoideum
#1
Sarah Alamer, Yusuke Kageyama, Robert E Gundersen
Guanine nucleotide-binding proteins (G proteins) act as molecular switches to regulate many fundamental cellular processes. The lipid modification, palmitoylation, can be considered as a key factor for proper G protein function and plasma membrane localization. In Dictyostelium discoidum, Gα2 is essential for the chemotactic response to cAMP in their developmental life cycle. However, the regulation of Gα2 with respect to palmitoylation, activation and Gβγ association is less clear. In this study, Gα2 is shown to be palmitoylated on Cys-4 by [3 H]palmitate labeling...
January 20, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29352638/the-evaluation-of-the-hydrophilic-hydrophobic-interactions-and-their-effect-in-water-methanol-solutions-a-study-in-terms-of-the-thermodynamic-state-functions-in-the-frame-of-the-transition-state-theory
#2
Francesco Mallamace, Carmelo Corsaro, Sveva Longo, Sow-Hsin Chen, Domenico Mallamace
Aqueous solutions of amphiphilic molecules are characterized by the competition between hydrophilic and hydrophobic interactions. These interactions have a different energetic dependence with the temperature. Whereas hydrophilic interactions have been well characterized, a complete theory for the hydrophobic ones is still lacking as well as the comprehension of the effect that the solvent exerts on the solute and vice versa. In this paper from the measured relaxation time, we evaluated the thermodynamic state functions of water-methanol solutions in the frame of the transition state theory...
January 11, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29352629/an-in-silico-comparative-dosimetric-study-of-postmastectomy-locoregional-irradiation-using-intensity-modulated-vs-3-dimensional-conventional-radiotherapy
#3
Pooja Khullar, Charu Garg, Sujit Nath Sinha, Inderjit Kaur, Niloy Ranjan Datta
An in silico dosimetric evaluation of intensity-modulated radiation therapy (IMRT) vs 3-dimensional conventional radiation therapy (3D-CRT) treatment plans in postmastectomy radiation therapy (PMRT) to the chest wall and regional lymphatics was conducted. Twenty-five consecutive patients with breast cancer referred for locoregional PMRT, stages T2-4 with N1-3, were planned to receive 50 Gy in 25 fractions with IMRT. Additionally, a 3D-CRT plan was generated using identical contours for the clinical target volumes (CTV), planning target volumes (PTV), and organs at risk (OAR)...
January 15, 2018: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29352564/optical-metabolic-imaging-of-irradiated-rat-heart-exposed-to-ischemia-reperfusion-injury
#4
Mette Funding la Cour, Shima Mehrvar, James S Heisner, Mohammad Masoudi Motlagh, Meetha Medhora, Mahsa Ranji, Amadou K S Camara
Whole thoracic irradiation (WTI) is known to cause deterioration in cardiac function. Whether irradiation predisposes the heart to further ischemia and reperfusion (IR) injury is not well known. The aim of this study is to examine the susceptibility of rat hearts to IR injury following a single fraction of 15 Gy WTI and to investigate the role of mitochondrial metabolism in the differential susceptibility to IR injury. After day 35 of irradiation, ex vivo hearts from irradiated and nonirradiated rats (controls) were exposed to 25-min global ischemia followed by 60-min IR, or hearts were perfused without IR for the same protocol duration [time controls (TC)]...
January 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29352492/variability-of-pulsed-energy-outputs-from-three-dermatology-lasers-during-multiple-simulated-treatments
#5
J Britton
BACKGROUND: Dermatology laser treatments are undertaken at regional departments using lasers of different powers and wavelengths. In order to achieve good outcomes there need to be good consistency of laser output across different weeks as it is custom and practice to break down the treatments into individual fractions. Departments will also collect information from test patches to help decide on the most appropriate treatment parameters for individual patients. OBJECTIVES: The objective of these experiments is to assess the variability of the energy outputs from a small number of lasers across multiple weeks at realistic parameters...
January 20, 2018: Photodermatology, Photoimmunology & Photomedicine
https://www.readbyqxmd.com/read/29352475/characteristics-of-proanthocyanidins-in-leaves-of-chamaecyparis-obtusa-var-formosana-as-strong-%C3%AE-glucosidase-inhibitors
#6
Chia-Yun Hsu, Gong-Min Lin, Huan-You Lin, Shang-Tzen Chang
BACKGROUND: In recent decades there has been a growing demand for natural products with a view to using them as α-glucosidase inhibitors for reducing postprandial hyperglycemia. The hot water extract from Chamaecyparis obtusa var. formosana (Hayata) Rehder (Cupressaceae) (HWE) leaves and its soluble fractions were screened for α-glucosidase inhibition properties. The n-butanol soluble fraction of HWE was further fractionated into fourteen subfractions (B1-B14) using a Sephadex LH-20 column...
January 20, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29352448/mesenchymal-stem-cell-deformability-and-implications-for-microvascular-sequestration
#7
Herbert H Lipowsky, Daniel T Bowers, Britany L Banik, Justin L Brown
Mesenchymal stem cells (MSCs) have received considerable attention in regenerative medicine, particularly in light of prospects for targeted delivery by intra-arterial injection. However, little is known about the mechanics of MSC sequestration in the microvasculature and the yield pressure (PY), above which MSCs will pass through microvessels of a given diameter. The objectives of the current study were to delineate the dependency of PY on cell size and the heterogeneity of cell mechanical properties and diameters (DCELL) of cultured MSCs...
January 19, 2018: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29352380/integrated-prediction-of-lesion-specific-ischaemia-from-quantitative-coronary-ct-angiography-using-machine-learning-a-multicentre-study
#8
Damini Dey, Sara Gaur, Kristian A Ovrehus, Piotr J Slomka, Julian Betancur, Markus Goeller, Michaela M Hell, Heidi Gransar, Daniel S Berman, Stephan Achenbach, Hans Erik Botker, Jesper Moller Jensen, Jens Flensted Lassen, Bjarne Linde Norgaard
OBJECTIVES: We aimed to investigate if lesion-specific ischaemia by invasive fractional flow reserve (FFR) can be predicted by an integrated machine learning (ML) ischaemia risk score from quantitative plaque measures from coronary computed tomography angiography (CTA). METHODS: In a multicentre trial of 254 patients, CTA and invasive coronary angiography were performed, with FFR in 484 vessels. CTA data sets were analysed by semi-automated software to quantify stenosis and non-calcified (NCP), low-density NCP (LD-NCP, < 30 HU), calcified and total plaque volumes, contrast density difference (CDD, maximum difference in luminal attenuation per unit area) and plaque length...
January 19, 2018: European Radiology
https://www.readbyqxmd.com/read/29352329/the-advantages-of-bilateral-osteotomy-over-unilateral-osteotomy-for-osteoporotic-bone-healing
#9
M Komrakova, J Fiebig, D B Hoffmann, C Krischek, W Lehmann, K M Stuermer, S Sehmisch
Most models of osteoporotic bone fractures are performed unilaterally (UL). We investigated healing of tibia osteotomy performed either UL or bilaterally (BL) in ovariectomized rats. Behavior of animals and muscle structure were assessed. Three-month-old female Sprague-Dawley rats were ovariectomized (n = 32). After 10 weeks, half the rats underwent UL osteotomy of tibia metaphysis (right limb) with plate osteosynthesis. The other rats were osteotomized BL. Half of the rats in each group received either standard pain treatment with carprofen (5 mg/kg body weight (BW), 1x/day for 2 days) or carprofen and buprenorphine (5 mg/kg BW, 1x/day and 0...
January 19, 2018: Calcified Tissue International
https://www.readbyqxmd.com/read/29352326/noninvasive-pulse-contour-analysis-for-determination-of-cardiac-output-in-patients-with-chronic-heart-failure
#10
Sebastian Roth, Henrik Fox, Uwe Fuchs, Uwe Schulz, Angelika Costard-Jäckle, Jan F Gummert, Dieter Horstkotte, Olaf Oldenburg, Thomas Bitter
BACKGROUND: Determination of cardiac output (CO) is essential in diagnosis and management of heart failure (HF). The gold standard to obtain CO is invasive assessment via thermodilution (TD). Noninvasive pulse contour analysis (NPCA) is supposed as a new method of CO determination. However, a validation of this method in HF is pending and performed in the present study. METHODS: Patients with chronic-stable HF and reduced left ventricular ejection fraction (LVEF ≤ 45%; HF-REF) underwent right heart catheterization including TD...
January 19, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/29352321/inflammatory-linked-changes-in-cpg-island-methylation-of-three-opioid-peptide-genes-in-a-rat-model-for-pain
#11
Charlotte Louise Justine Jacobi, Christoph Stein
Expression of the opioid peptide genes proopiomelanocortin (Pomc), proenkephalin (Penk), and prodynorphin (Pdyn), in immune cells plays a key role in endogenous pain control. In a rat model of painful unilateral paw inflammation, we isolated cells from popliteal lymph nodes and evaluated the role of CpG island C5-methylation on the transcriptional activation of those genes. Using methylated DNA immunoprecipitation, we sorted gDNA into methylated (me) and non-me fractions and then determined the CpG island methylation status of each fraction via quantitative Real Time-PCR (qRT-PCR)...
2018: PloS One
https://www.readbyqxmd.com/read/29352312/a-role-for-domain-i-of-the-hepatitis-c-virus-ns5a-protein-in-virus-assembly
#12
Chunhong Yin, Niluka Goonawardane, Hazel Stewart, Mark Harris
The NS5A protein of hepatitis C virus (HCV) plays roles in both virus genome replication and assembly. NS5A comprises three domains, of these domain I is believed to be involved exclusively in genome replication. In contrast, domains II and III are required for the production of infectious virus particles and are largely dispensable for genome replication. Domain I is highly conserved between HCV and related hepaciviruses, and is highly structured, exhibiting different dimeric conformations. To investigate the functions of domain I in more detail, we conducted a mutagenic study of 12 absolutely conserved and surface-exposed residues within the context of a JFH-1-derived sub-genomic replicon and infectious virus...
January 19, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29352302/correction-identification-of-soil-p-fractions-that-are-associated-with-p-loss-from-surface-runoff-under-various-cropping-systems-and-fertilizer-rates-on-sloped-farmland
#13
Xinghua Li, Baona Wang, Tewu Yang, Duanwei Zhu, Zhongnan Nie, Junchi Xu
[This corrects the article DOI: 10.1371/journal.pone.0179275.].
2018: PloS One
https://www.readbyqxmd.com/read/29352222/artificial-chameleon-skin-that-controls-spectral-radiation-development-of-chameleon-cool-coating-c3
#14
Hiroki Gonome, Masashi Nakamura, Junnosuke Okajima, Shigenao Maruyama
Chameleons have a diagnostic thermal protection that enables them to live under various conditions. Our developed special radiative control therefore is inspired by the chameleon thermal protection ability by imitating its two superposed layers as two pigment particles in one coating layer. One particle imitates a chameleon superficial surface for color control (visible light), and another particle imitates a deep surface to reflect solar irradiation, especially in the near-infrared region. Optical modeling allows us to optimally design the particle size and volume fraction...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352217/bedside-assessment-of-regional-cerebral-perfusion-using-near-infrared-spectroscopy-and-indocyanine-green-in-patients-with-atherosclerotic-occlusive-disease
#15
Hiroshi Saito, Tatsuya Ishikawa, Jun Tanabe, Shinya Kobayashi, Junta Moroi
This pilot study aimed to investigate the utility of near-infrared spectroscopy/indocyanine green (NIRS/ICG) for examining patients with occlusive cerebrovascular disease. Twenty-nine patients with chronic-stage atherosclerotic occlusive cerebrovascular disease were included. The patients were monitored using NIRS at the bedside. Using ICG time-intensity curves, the affected-to-unaffected side ratios were calculated for several parameters, including the maximum ICG concentration (ΔICGmax), time to peak (TTP), rise time (RT), and blood flow index (BFI = ΔICGmax/RT), and were compared to the affected-to-unaffected side ratios of the regional cerebral blood flow (rCBF) and regional oxygen extraction fraction (rOEF) obtained using positron emission tomography with 15O-labeled gas...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352207/ethanol-sensitizes-hepatocytes-for-tgf-%C3%AE-triggered-apoptosis
#16
Haristi Gaitantzi, Christoph Meyer, Pia Rakoczy, Maria Thomas, Kristin Wahl, Franziska Wandrer, Heike Bantel, Hamed Alborzinia, Stefan Wölfl, Sabrina Ehnert, Andreas Nüssler, Ina Bergheim, Loredana Ciuclan, Matthias Ebert, Katja Breitkopf-Heinlein, Steven Dooley
Alcohol abuse is a global health problem causing a substantial fraction of chronic liver diseases. Abundant TGF-β-a potent pro-fibrogenic cytokine-leads to disease progression. Our aim was to elucidate the crosstalk of TGF-β and alcohol on hepatocytes. Primary murine hepatocytes were challenged with ethanol and TGF-β and cell fate was determined. Fluidigm RNA analyses revealed transcriptional effects that regulate survival and apoptosis. Mechanistic insights were derived from enzyme/pathway inhibition experiments and modulation of oxidative stress levels...
January 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29352189/mechanical-behavior-of-a-soft-hydrogel-reinforced-with-three-dimensional-printed-microfibre-scaffolds
#17
Miguel Castilho, Gernot Hochleitner, Wouter Wilson, Bert van Rietbergen, Paul D Dalton, Jürgen Groll, Jos Malda, Keita Ito
Reinforcing hydrogels with micro-fibre scaffolds obtained by a Melt-Electrospinning Writing (MEW) process has demonstrated great promise for developing tissue engineered (TE) constructs with mechanical properties compatible to native tissues. However, the mechanical performance and reinforcement mechanism of the micro-fibre reinforced hydrogels is not yet fully understood. In this study, FE models, implementing material properties measured experimentally, were used to explore the reinforcement mechanism of fibre-hydrogel composites...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352146/effects-of-renal-denervation-on-cardiac-structural-and-functional-abnormalities-in-patients-with-resistant-hypertension-or-diastolic-dysfunction
#18
Shiying Wang, Suxia Yang, Xinxin Zhao, Jun Shi
The aim of the present study is to systematically evaluate the impact of RDN on cardiac structure and function in patients with resistant hypertension (RH) or diastolic dysfunction. We retrieved Pubmed, Embase and Cocharane Library databases, from inception to April 1st, 2016. Studies reporting left ventricular mass (LVMI) or left ventricular (LV) diastolic function (reflected by the ratio of mitral inflow velocity to annular relaxation velocity [E/e']) responses to RDN were included. Two randomized controlled trials (RCTs), 3 controlled studies and 11 uncontrolled studies were finally identified...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352137/iron-biogeochemistry-in-the-high-latitude-north-atlantic-ocean
#19
Eric P Achterberg, Sebastian Steigenberger, Chris M Marsay, Frédéric A C LeMoigne, Stuart C Painter, Alex R Baker, Douglas P Connelly, C Mark Moore, Alessandro Tagliabue, Toste Tanhua
Iron (Fe) is an essential micronutrient for marine microbial organisms, and low supply controls productivity in large parts of the world's ocean. The high latitude North Atlantic is seasonally Fe limited, but Fe distributions and source strengths are poorly constrained. Surface ocean dissolved Fe (DFe) concentrations were low in the study region (<0.1 nM) in summer 2010, with significant perturbations during spring 2010 in the Iceland Basin as a result of an eruption of the Eyjafjallajökull volcano (up to 2...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352093/excessive-daytime-sleepiness-independently-predicts-increased-cardiovascular-risk-after-myocardial-infarction
#20
Jiang Xie, Fatima H Sert Kuniyoshi, Naima Covassin, Prachi Singh, Apoor S Gami, C Anwar A Chahal, Virend K Somers
BACKGROUND: Excessive daytime sleepiness (EDS), a common symptom among patients with sleep-disordered breathing, is closely associated with the development of cardiovascular diseases, but its long-term prognostic value is not completely understood. The aim of this study was to investigate whether EDS would be an independent prognostic factor after myocardial infarction. METHODS AND RESULTS: We prospectively recruited 112 post-myocardial infarction patients. The Epworth Sleepiness Scale was completed before polysomnography, and EDS was defined as a score ≥11...
January 19, 2018: Journal of the American Heart Association
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