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https://www.readbyqxmd.com/read/28222245/translation-rewiring-at-the-heart-of-phenotype-switching-in-melanoma
#1
Eleonora Leucci, Pierre Close, Jean-Christophe Marine
During tumor progression cancer cells are constantly challenged by intrinsic oncogene-induced and extrinsic micro-environmental stress signals such as hypoxia, nutrient deprivation, oxidative and genotoxic stress. Under these suboptimal growth conditions cancer cells activate an Integrative Stress Response (ISR), which results in a transient decrease in energy consumption followed by a cellular adaptation phase and possibly recovery, if the environmental conditions become more favorable. Translation is a very high energy-consuming process; it is therefore not surprising that to minimize energy consumption cancer cells turn down global protein synthesis rates while reprograming translation towards specific transcripts required for survival and adaptation...
February 21, 2017: Pigment Cell & Melanoma Research
https://www.readbyqxmd.com/read/28219950/nutritional-modulation-of-mouse-and-human-liver-bud-growth-through-a-branched-amino-acid-metabolism
#2
Hiroyuki Koike, Ran-Ran Zhang, Yasuharu Ueno, Keisuke Sekine, Yun-Wen Zheng, Takanori Takebe, Hideki Taniguchi
Liver bud progenitors experience a transient amplification during early organ growth phase, yet the responsible mechanism was not fully understood. Collective evidence highlighted the specific requirements in stem cell metabolism for expanding organ progenitors during organogenesis and regeneration. Here, transcriptome analyses showed progenitors of mouse and human liver bud growth stage specifically expressed branched chain aminotransferase1 gene, a known breakdown enzyme of branched-chain amino acid (BCAA) for energy generation...
February 20, 2017: Development
https://www.readbyqxmd.com/read/28218392/acute-kidney-injury-and-mortality-1-year-after-major-non-cardiac-surgery
#3
M E O'Connor, R W Hewson, C J Kirwan, G L Ackland, R M Pearse, J R Prowle
BACKGROUND: Even mild and transient acute kidney injury (AKI), defined by increases in serum creatinine level, has been associated with adverse outcomes after major surgery. However, characteristic decreases in creatinine concentration during major illness could confound accurate assessment of postoperative AKI. METHODS: In a single-hospital, retrospective cohort study of non-cardiac surgery, the association between postoperative AKI, defined using the Kidney Disease: Improving Global Outcomes criteria, and 1-year survival was modelled using a multivariable Cox proportional hazards analysis...
February 20, 2017: British Journal of Surgery
https://www.readbyqxmd.com/read/28216105/-increasing-the-carbohydrate-storage-capacity-of-plants-by-engineering-a-glycogen-like-polymer-pool-in-the-cytosol
#4
Simona Eicke, David Seung, Barbara Egli, Emanuel A Devers, Sebastian Streb
Global demand for higher crop yields and for more efficient utilization of agricultural products will grow over the next decades. Here, we present a new concept for boosting the carbohydrate content of plants, by channeling photosynthetically fixed carbon into a newly engineered glucose polymer pool. We transiently expressed the starch/glycogen synthases from either Saccharomyces cerevisiae or Cyanidioschyzon merolae, together with the starch branching enzyme from C. merolae, in the cytosol of Nicotiana benthamiana leaves...
February 16, 2017: Metabolic Engineering
https://www.readbyqxmd.com/read/28213522/type-i-interferon-regulated-gene-expression-and-signaling-in-murine-mixed-glial-cells-lacking-signal-transducers-and-activators-of-transcription-1-or-2-or-interferon-regulatory-factor-9
#5
Wen Li, Markus J Hofer, Pattama Songkhunawej, So Ri Jung, Dale Hancock, Gareth Denyer, Iain L Campbell
Type I interferons (IFN-I) are critical in antimicrobial and antitumor defense. Although IFN-I signal via the interferon-stimulated gene factor 3 (ISGF3) complex consisting of STAT1, STAT2 and IRF9, IFN-I can mediate significant biological effects via ISGF3-independent pathways. For example, absence of STAT1, STAT2 or IRF9 exacerbates neurological disease in transgenic mice with CNS-production of IFN-Ι. Here we determined the role of IFN-I-driven, ISGF3-independent signaling in regulating global gene expression in STAT1, STAT2 or IRF9-deficient murine mixed glial cell cultures (MGCs)...
February 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28212873/temperament-and-character-personality-dimensions-in-nitrate-tilt-induced-vasovagal-syncope-patients
#6
Vincenzo Russo, Ahmed AlTurki, Anna Rago, Riccardo Proietti, Guillaume Chaussé, Alessio Maria Monteleone, Pasquale Scognamiglio, Palmiero Monteleone, Gerardo Nigro
INTRODUCTION: Vasovagal syncope (VVS) is a clinical syndrome characterized by transient loss of consciousness and postural tone that is due to a temporary and spontaneously self-terminating global cerebral hypoperfusion. It is known that personality modulates the individual's sensitivity to stressors, and emotional arousal and psychologic uncertainty are conditions contributing to vasodepressor syncope. Therefore it is postulated that personality characteristics of VVS patients could have a role in the pathophysiology of VVS...
February 14, 2017: Hellenic Journal of Cardiology: HJC, Hellēnikē Kardiologikē Epitheōrēsē
https://www.readbyqxmd.com/read/28210481/human-papillomavirus-hpv-virion-induced-cancer-and-subfertility-two-sides-of-the-same-coin
#7
REVIEW
T Depuydt, J Beert, E Bosmans, G Salembier
In the natural history of HPV infections, the HPV virions can induce two different pathways, namely the infec- tious virion producing pathway and the clonal transforming pathway. An overview is given of the burden that is associated with HPV infections that can both lead to cervical cancer and/or temporal subfertility. That HPV infections cause serious global health burden due to HPV-associated cancers is common knowledge, but that it is also responsible for a substantial part of idiopathic subfertility is greatly underestimated...
December 2016: Facts, Views & Vision in ObGyn
https://www.readbyqxmd.com/read/28194422/pharmacokinetic-properties-of-adenosine-amine-congener-in-cochlear-perilymph-after-systemic-administration
#8
Hao Chang, Ravindra S Telang, Sreevalsan Sreebhavan, Malcolm Tingle, Peter R Thorne, Srdjan M Vlajkovic
Noise-induced hearing loss (NIHL) is a global health problem affecting over 5% of the population worldwide. We have shown previously that acute noise-induced cochlear injury can be ameliorated by administration of drugs acting on adenosine receptors in the inner ear, and a selective A1 adenosine receptor agonist adenosine amine congener (ADAC) has emerged as a potentially effective treatment for cochlear injury and resulting hearing loss. This study investigated pharmacokinetic properties of ADAC in rat perilymph after systemic (intravenous) administration using a newly developed liquid chromatography-tandem mass spectrometry detection method...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28188293/asymmetric-configurations-in-a-reengineered-homodimer-reveal-multiple-subunit-communication-pathways-in-protein-allostery
#9
Maria Fe Lanfranco, Fernanda Gárate, Ashton J Engdahl, Rodrigo A Maillard
Many allosteric proteins form homo-oligomeric complexes to regulate a biological function. In homo-oligomers, subunits establish communication pathways that are modulated by external stimuli like ligand binding. A challenge for dissecting the communication mechanisms in homo-oligomers is identifying intermediate liganded states, which are typically transiently populated. However, their identities provide the most mechanistic information on how ligand-induced signals propagate from bound to empty subunits. Here, we dissected the directionality and magnitude of subunit communication in a reengineered, single-chain version of the homodimeric transcription factor cAMP Receptor Protein (CRPSC)...
February 10, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28188218/focal-solute-trapping-and-global-glymphatic-pathway-impairment-in-a-murine-model-of-multiple-microinfarcts
#10
Minghuan Wang, Fengfei Ding, SaiYue Deng, Xuequn Guo, Wei Wang, Jeffrey J Iliff, Maiken Nedergaard
Microinfarcts occur commonly in the aging brain as a consequence of diffuse embolic events and are associated with the development of vascular dementia and Alzheimer's disease. Yet the manner in which disperse microscopic lesions reduce global cognitive function and increase the risk for Alzheimer's disease is unclear. The glymphatic system, which is a brain-wide perivascular network that supports the recirculation of CSF through the brain parenchyma, facilitates the clearance of interstitial solutes including amyloid beta and tau...
February 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28186173/locating-temporal-functional-dynamics-of-visual-short-term-memory-binding-using-graph-modular-dirichlet-energy
#11
Keith Smith, Benjamin Ricaud, Nauman Shahid, Stephen Rhodes, John M Starr, Augustin Ibáñez, Mario A Parra, Javier Escudero, Pierre Vandergheynst
Visual short-term memory binding tasks are a promising early marker for Alzheimer's disease (AD). To uncover functional deficits of AD in these tasks it is meaningful to first study unimpaired brain function. Electroencephalogram recordings were obtained from encoding and maintenance periods of tasks performed by healthy young volunteers. We probe the task's transient physiological underpinnings by contrasting shape only (Shape) and shape-colour binding (Bind) conditions, displayed in the left and right sides of the screen, separately...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28185658/long-term-outcome-in-patients-with-transient-global-amnesia-a-population-based-study
#12
Julieta E Arena, Robert D Brown, Jay Mandrekar, Alejandro A Rabinstein
OBJECTIVE: To study the long-term risk of cerebrovascular events, seizures, and cognitive impairment in patients with transient global amnesia (TGA). PATIENTS AND METHODS: Data for all patients diagnosed with possible TGA in Olmsted County, Minnesota, between January 1, 1985, through December 31, 2010, were retrieved from the Rochester Epidemiology Project database. Transient global amnesia was defined clinically. End points were cerebrovascular event (stroke or transient ischemic attack), seizure, or cognitive impairment (mild cognitive impairment or dementia) during follow-up...
February 6, 2017: Mayo Clinic Proceedings
https://www.readbyqxmd.com/read/28168248/photoinduced-bimolecular-electron-transfer-from-aromatic-amines-to-pentafluorophenyl-porphyrin-combined-with-ultrafast-charge-recombination-persistence-with-marcus-inverted-region
#13
Yeduru Venkatesh, Venkatesan Munisamy, Bheerappagari Ramakrishna, Pippara Hemant Kumar, Haraprasad Mandal, Prakriti Ranjan Bangal
The dynamics of photoinduced bimolecular reductive electron transfer between meso-tetrakis(pentafluorophenyl)porphyrin (H2F20TPP), an acceptor (A), and five aromatic amines (donor (D)) with varying oxidation potentials (aniline (AN), N-methylaniline (MAN), N-ethylaniline (EAN), N,N-dimethylaniline (DMAN) and N,N-diethylaniline (DEAN)) in dichloromethane (DCM) as a solvent as well as in neat donor solvents were investigated by employing nanosecond to femtosecond time-resolved fluorescence spectroscopy and femtosecond time-resolved transient absorption spectroscopy upon S2 excitation of H2F20TPP...
February 7, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28157301/computing-the-rotational-diffusion-of-biomolecules-via-molecular-dynamics-simulation-and-quaternion-orientations
#14
Po-Chia Chen, Maggy Hologne, Olivier Walker
Rotational diffusion (Drot) is a fundamental property of biomolecules that contains information about molecular dimensions and solute-solvent interactions. While ab initio Drot prediction can be achieved by explicit all-atom molecular dynamics simulations, this is hindered by both computational expense and limitations in water models. We propose coarse-grained force fields as a complementary solution, and show that the MARTINI force field with elastic networks is sufficient to compute Drot in >10 proteins spanning 5-157 kDa...
February 15, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28157096/only-white-matter-hyperintensities-predicts-post-stroke-cognitive-performances-among-cerebral-small-vessel-disease-markers-results-from-the-tabasco-study
#15
Jeremy Molad, Efrat Kliper, Amos D Korczyn, Einor Ben Assayag, Dafna Ben Bashat, Shani Shenhar-Tsarfaty, Orna Aizenstein, Ludmila Shopin, Natan M Bornstein, Eitan Auriel
BACKGROUND: White matter hyperintensities (WMH) were shown to predict cognitive decline following stroke or transient ischemic attack (TIA). However, WMH are only one among other radiological markers of cerebral small vessel disease (SVD). OBJECTIVE: The aim of this study was to determine whether adding other SVD markers to WMH improves prediction of post-stroke cognitive performances. METHODS: Consecutive first-ever stroke or TIA patients (n = 266) from the Tel Aviv Acute Brain Stroke Cohort (TABASCO) study were enrolled...
February 1, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28148589/lesson-of-the-month-2-transient-reversible-amnesia-in-multiple-sclerosis
#16
Priya Devi Shanmugarajah, Jane Alty, Oliver Lily, Helen L Ford
Transient amnestic syndromes are fascinating clinical entities and there are several subtypes. Transient global amnesia (TGA) is characterised by sudden onset of anterograde amnesia with repetitive questioning, lasting less than 24 hours. The pathophysiology of TGA involves the medial temporal lobes and hippocampi. Episodes of TGA are thought to involve venous congestion with Valsalva-like activities, vascular or migrainous mechanisms. In contrast, transient epileptic amnesia manifests as brief and frequent episodes of amnesia due to seizure activity in the temporal lobes...
February 2017: Clinical Medicine: Journal of the Royal College of Physicians of London
https://www.readbyqxmd.com/read/28147265/gender-differences-in-global-but-not-targeted-demethylation-in-ipsc-reprogramming
#17
Inês Milagre, Thomas M Stubbs, Michelle R King, Julia Spindel, Fátima Santos, Felix Krueger, Martin Bachman, Anne Segonds-Pichon, Shankar Balasubramanian, Simon R Andrews, Wendy Dean, Wolf Reik
Global DNA demethylation is an integral part of reprogramming processes in vivo and in vitro, but whether it occurs in the derivation of induced pluripotent stem cells (iPSCs) is not known. Here, we show that iPSC reprogramming involves both global and targeted demethylation, which are separable mechanistically and by their biological outcomes. Cells at intermediate-late stages of reprogramming undergo transient genome-wide demethylation, which is more pronounced in female cells. Global demethylation requires activation-induced cytidine deaminase (AID)-mediated downregulation of UHRF1 protein, and abolishing demethylation leaves thousands of hypermethylated regions in the iPSC genome...
January 31, 2017: Cell Reports
https://www.readbyqxmd.com/read/28137981/sudden-cardiac-death-the-pro-arrhythmic-interaction-of-an-acute-loading-with-an-underlying-substrate
#18
George R Sutherland
Sudden cardiac death (SCD) is a complex phenomenon, occurring either in apparently normal individuals or in those where there is a recognized underlying cardiac abnormality. In both groups, the lethal arrhythmia has frequently been related to the physiologic trigger of either exercise or stress. Prior research into SCD has focused mainly on a combination of identifying either vulnerable myocardial substrates; pharmacological approaches to altering electrical activation/repolarisation in substrates; or the suppression of induced lethal arrhythmias with implantable defibrillators...
January 29, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28137849/holocene-peatland-and-ice-core-data-constraints-on-the-timing-and-magnitude-of-co2-emissions-from-past-land-use
#19
Benjamin David Stocker, Zicheng Yu, Charly Massa, Fortunat Joos
CO2 emissions from preindustrial land-use change (LUC) are subject to large uncertainties. Although atmospheric CO2 records suggest only a small land carbon (C) source since 5,000 y before present (5 kyBP), the concurrent C sink by peat buildup could mask large early LUC emissions. Here, we combine updated continuous peat C reconstructions with the land C balance inferred from double deconvolution analyses of atmospheric CO2 and [Formula: see text]C at different temporal scales to investigate the terrestrial C budget of the Holocene and the last millennium and constrain LUC emissions...
January 30, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28128544/high-resolution-4d-pre-clinical-spect-ct-imaging-of-technetium-transport-within-a-heterogeneous-porous-media
#20
Mine Dogan, Stephen M J Moysey, Ruud M Ramakers, Timothy A DeVol, Frederik J Beekman, Harald C Groen, Brian A Powell
A dynamic (99m)Tc tracer experiment was performed to investigate the capabilities of combined pre-clinical single photon emission computed tomography (SPECT) and x-ray computed tomography (CT) for investigating transport in a heterogeneous porous medium. The experiment was conducted by continuously injecting a (99m)Tc solution into a column packed with 8 layers (i.e., soil, silica gel, and 0.2-4 mm glass beads). Within the imaging results it was possible to correlate observed features with objects as small as 2 mm for the SPECT and 0...
January 27, 2017: Environmental Science & Technology
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