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https://www.readbyqxmd.com/read/28637236/the-ribosome-assembly-gene-network-is-controlled-by-the-feedback-regulation-of-transcription-elongation
#1
Fernando Gómez-Herreros, Thanasis Margaritis, Olga Rodríguez-Galán, Vicent Pelechano, Victoria Begley, Gonzalo Millán-Zambrano, Macarena Morillo-Huesca, Mari Cruz Muñoz-Centeno, José E Pérez-Ortín, Jesús de la Cruz, Frank C P Holstege, Sebastián Chávez
Ribosome assembly requires the concerted expression of hundreds of genes, which are transcribed by all three nuclear RNA polymerases. Transcription elongation involves dynamic interactions between RNA polymerases and chromatin. We performed a synthetic lethal screening in Saccharomyces cerevisiae with a conditional allele of SPT6, which encodes one of the factors that facilitates this process. Some of these synthetic mutants corresponded to factors that facilitate pre-rRNA processing and ribosome biogenesis...
June 15, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28636873/mimicking-natural-phytohormones-26-hydroxycholestan-22-one-derivatives-as-plant-growth-promoters
#2
Reyna Zeferino-Diaz, J Ciciolil Hilario-Martinez, Maricela Rodriguez-Acosta, Alan Carrasco-Carballo, Maria Guadalupe Hernandez-Linares, Jesus Sandoval-Ramirez, Maria A Fernandez-Herrera
26-Hydroxycholestan-22-one derivatives with oxygenated functions in the rings A and/or B were successfully synthesized from diosgenin. After the modifications of rings A and B, the spiroketal side chain was selectively opened through a Lewis acid mediated acetolysis to afford the cholestane derivatives. These compounds incorporate pharmacophores, which mimic the activity of natural phytohormones and show high growth promoting activity in Mexican rice cultivars using the rice lamina inclination test.
June 18, 2017: Steroids
https://www.readbyqxmd.com/read/28636851/first-line-nivolumab-in-stage-iv-or-recurrent-non-small-cell-lung-cancer
#3
David P Carbone, Martin Reck, Luis Paz-Ares, Benjamin Creelan, Leora Horn, Martin Steins, Enriqueta Felip, Michel M van den Heuvel, Tudor-Eliade Ciuleanu, Firas Badin, Neal Ready, T Jeroen N Hiltermann, Suresh Nair, Rosalyn Juergens, Solange Peters, Elisa Minenza, John M Wrangle, Delvys Rodriguez-Abreu, Hossein Borghaei, George R Blumenschein, Liza C Villaruz, Libor Havel, Jana Krejci, Jesus Corral Jaime, Han Chang, William J Geese, Prabhu Bhagavatheeswaran, Allen C Chen, Mark A Socinski
Background Nivolumab has been associated with longer overall survival than docetaxel among patients with previously treated non-small-cell lung cancer (NSCLC). In an open-label phase 3 trial, we compared first-line nivolumab with chemotherapy in patients with programmed death ligand 1 (PD-L1)-positive NSCLC. Methods We randomly assigned, in a 1:1 ratio, patients with untreated stage IV or recurrent NSCLC and a PD-L1 tumor-expression level of 1% or more to receive nivolumab (administered intravenously at a dose of 3 mg per kilogram of body weight once every 2 weeks) or platinum-based chemotherapy (administered once every 3 weeks for up to six cycles)...
June 22, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28636666/molecular-and-microbiological-report-of-a-hospital-outbreak-of-ndm-1-carrying-enterobacteriaceae-in-mexico
#4
Paola Bocanegra-Ibarias, Elvira Garza-González, Rayo Morfín-Otero, Humberto Barrios, Licet Villarreal-Treviño, Eduardo Rodríguez-Noriega, Ulises Garza-Ramos, Santiago Petersen-Morfin, Jesus Silva-Sanchez
OBJECTIVES: To characterize the microbiological, molecular and epidemiological data of an outbreak of carbapenem-resistant Enterobacteriaceae (CRE) in a tertiary-care hospital in Mexico. METHODS: From September 2014 to July 2015, all CRE clinical isolates recovered during an outbreak in the Hospital Civil "Fray Antonio Alcalde" in Jalisco, Mexico were screened for antimicrobial susceptibility, carbapenemase production, carbapenemase-encoding genes, and plasmid profiles...
2017: PloS One
https://www.readbyqxmd.com/read/28636411/asthma-and-influenza-vaccination-in-elderly-hospitalized-patients-matched-case-control-study-in-spain
#5
María Morales Suárez-Varela, Agustin Llopis, Estrella Fernandez-Fabrellas, Francisco Sanz, M Jose Perez-Lozano, Vicente Martin, Jenaro Astray, Jesús Castilla, Mikel Egurrola, Luis Force, Diana Toledo, Àngela Domínguez
OBJECTIVES: Influenza infection is an exacerbating factor for asthma, and its prevention is critical in managing asthmatic patients. We investigated the effect of influenza vaccination on asthmatic and non-asthmatic patients hospitalized with laboratory-confirmed influenza in Spain. METHODS: We made a matched case-control study to assess the frequency of hospitalization for influenza in people aged ≥65 years. Hospitalized patients with unplanned hospital admissions were recruited from 20 hospitals representing seven Spanish regions...
June 21, 2017: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/28636405/conventional-polysomnography-is-not-necessary-for-the-management-of-most-patients-with-suspected-obstructive-sleep-apnea
#6
Jaime Corral, Maria-Ángeles Sánchez-Quiroga, Carmen Carmona-Bernal, Ángeles Sánchez-Armengol, Alicia Sánchez-de-la-Torre, Joaquín Durán-Cantolla, Carlos J Egea, Neus Salord, Carmen Monasterio, Joaquín Terán, M Luz Alonso-Alvarez, Jesús Muñoz-Méndez, Eva M Arias, Marta Cabello, Josep M Montserrat, Mónica De la Peña, José C Serrano, Ferran Barbe, Juan F Masa
RATIONALE: Home respiratory polygraphy may be a simpler alternative to in-laboratory polysomnography for the management of more symptomatic obstructive sleep apnea patients, but its effectiveness has not been evaluated across a broad clinical spectrum. OBJECTIVE: To compare the long-term effectiveness (6 months) of home respiratory polygraphy and polysomnography management protocols in patients with intermediate to high sleep apnea suspicion (most patients requiring a sleep study)...
June 21, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28635673/toxicity-of-naphthalene-and-benzene-on-tribollium-castaneum-herbst
#7
Nerlis Pajaro-Castro, Karina Caballero-Gallardo, Jesus Olivero-Verbel
Naphthalene and benzene are widely-used volatile organic compounds. The aim of this research was to examine the toxicological effects of naphthalene and benzene against Tribolium castaneum as an animal model. Adult insects were exposed to these aromatic compounds to assess mortality after 4-48 h of exposure. The lethal concentration 50 (LC50) for naphthalene, naphthalin, and benzene were 63.6 µL/L, 20.0 µL/L, and 115.9 µL/L in air, respectively. Real-time polymerase chain reaction (PCR) analysis revealed expression changes in genes related to oxidative stress and metabolism [Glutathione S-Transferase (Gst), and Cytochrome P450 6BQ8 (Cyp6bq8)]; reproduction and metamorphosis [Hormone receptor in 39-like protein (Hr39), Ecdysone receptor: (Ecr), and Chitin synthase 2 (Chs2)]; and neurotransmission [Histamine-gated chloride channel 2 (Hiscl2)] in insects exposed for 4 h to 70...
June 21, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28635163/early-pregnancy-body-mass-index-modifies-the-association-of-pre-pregnancy-dietary-patterns-with-serum-polyunsaturated-fatty-acid-concentrations-throughout-pregnancy-in-brazilian-women
#8
Camila Benaim, Ana Amélia Freitas-Vilela, Thatiana de Jesus Pereira Pinto, Jaqueline Lepsch, Dayana Rodrigues Farias, Juliana Dos Santos Vaz, Tatiana El-Bacha, Gilberto Kac
Dietary patterns (DPs) have been described as an important factor that may influence polyunsaturated fatty acid (PUFA) concentrations and body mass index (BMI) during pregnancy. We aim to evaluate the association between pre-pregnancy DPs and serum PUFA percentages throughout pregnancy considering early pregnancy BMI as a possible effect modifier. A prospective cohort of 154 pregnant women was followed (5th-13th, 20th-26th, and 30th-36th gestational weeks). Serum PUFA concentrations (total n-3 and total n-6, eicosapentaenoic + docosahexaenoic acids) were measured in each trimester and expressed as percentages...
June 21, 2017: Maternal & Child Nutrition
https://www.readbyqxmd.com/read/28634303/structural-characterization-of-the-rabphilin-3a-snap25-interaction
#9
Cristina Ferrer-Orta, María Dolores Pérez-Sánchez, Teresa Coronado-Parra, Cristina Silva, David López-Martínez, Jesús Baltanás-Copado, Juan Carmelo Gómez-Fernández, Senena Corbalán-García, Núria Verdaguer
Membrane fusion is essential in a myriad of eukaryotic cell biological processes, including the synaptic transmission. Rabphilin-3A is a membrane trafficking protein involved in the calcium-dependent regulation of secretory vesicle exocytosis in neurons and neuroendocrine cells, but the underlying mechanism remains poorly understood. Here, we report the crystal structures and biochemical analyses of Rabphilin-3A C2B-SNAP25 and C2B-phosphatidylinositol 4,5-bisphosphate (PIP2) complexes, revealing how Rabphilin-3A C2 domains operate in cooperation with PIP2/Ca(2+) and SNAP25 to bind the plasma membrane, adopting a conformation compatible to interact with the complete SNARE complex...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28634142/cysteamine-polysaccharide-hydrogels-study-of-extended-ocular-delivery-and-biopermanence-time-by-pet-imaging
#10
Andrea Luaces-Rodríguez, Victoria Díaz-Tomé, Miguel González-Barcia, Jesús Silva-Rodríguez, Michel Herranz, María Gil-Martínez, María Teresa Rodríguez-Ares, Carla García-Mazás, José Blanco-Mendez, María Jesús Lamas, Francisco Javier Otero-Espinar, Anxo Fernández-Ferreiro
Cystinosis is a rare autosomal recessive disorder in which cystine crystals accumulate within the lysosomes of various organs, including the cornea. Ocular treatment is based on the administration of cysteamine eye drops, requiring its instillation several times per day. We have introduced the cysteamine in two types of previously developed ocular hydrogels (ion sensitive hydrogel with the polymers gellan gum and kappa-carrageenan and another one composed of hyaluronic acid), aiming at increasing the ocular retention in order to extend the dosing interval...
June 17, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28633670/preclinical-anti-myeloma-activity-of-edo-s101-a-new-bendamustine-derived-molecule-with-added-hdaci-activity-through-potent-dna-damage-induction-and-impairment-of-dna-repair
#11
Ana-Alicia López-Iglesias, Ana B Herrero, Marta Chesi, Laura San-Segundo, Lorena González-Méndez, Susana Hernández-García, Irena Misiewicz-Krzeminska, Dalia Quwaider, Montserrat Martín-Sánchez, Daniel Primo, Teresa Paíno, P Leif Bergsagel, Thomas Mehrling, Marcos González-Díaz, Jesús F San-Miguel, María-Victoria Mateos, Norma C Gutiérrez, Mercedes Garayoa, Enrique M Ocio
BACKGROUND: Despite recent advances in the treatment of multiple myeloma (MM), the prognosis of most patients remains poor, and resistance to traditional and new drugs frequently occurs. EDO-S101 is a novel therapeutic agent conceived as the fusion of a histone deacetylase inhibitor radical to bendamustine, with the aim of potentiating its alkylating activity. METHODS: The efficacy of EDO-S101 was evaluated in vitro, ex vivo and in vivo, alone, and in combination with standard anti-myeloma agents...
June 20, 2017: Journal of Hematology & Oncology
https://www.readbyqxmd.com/read/28633551/a-pareto-based-ensemble-with-feature-and-instance-selection-for-learning-from-multi-class-imbalanced-datasets
#12
Alberto Fernández, Cristobal José Carmona, María José Del Jesus, Francisco Herrera
Imbalanced classification is related to those problems that have an uneven distribution among classes. In addition to the former, when instances are located into the overlapped areas, the correct modeling of the problem becomes harder. Current solutions for both issues are often focused on the binary case study, as multi-class datasets require an additional effort to be addressed. In this research, we overcome these problems by carrying out a combination between feature and instance selections. Feature selection will allow simplifying the overlapping areas easing the generation of rules to distinguish among the classes...
April 11, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28633067/microbial-electrosynthesis-of-butyrate-from-carbon-dioxide-production-and-extraction
#13
Pau Batlle-Vilanova, Ramon Ganigué, Sara Ramió-Pujol, Lluís Bañeras, Gerard Jiménez, Manuela Hidalgo, M Dolors Balaguer, Jesús Colprim, Sebastià Puig
To date acetate is the main product of microbial electrosynthesis (MES) from carbon dioxide (CO2). In this work a tubular bioelectrochemical system was used to carry out MES and enhance butyrate production over the other organic products. Batch tests were performed at a fixed cathode potential of -0.8V vs SHE. The reproducibility of the results according to previous experiments was validated in a preliminary test. According to the literature butyrate production could take place by chain elongation reactions at low pH and high hydrogen partial pressure (pH2)...
June 15, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28632911/polymer-functionalized-gold-nanoparticles-as-non-viral-gene-delivery-reagents
#14
M Mar Encabo-Berzosa, Maria Sancho-Albero, Victor Sebastian, Silvia Irusta, Manuel Arruebo, Jesus Santamaria, Pilar Martín Duque
BACKGROUND: In this study we investigated the ability of PEG functionalized gold nanoparticles as non-viral vectors in the transfection of different cell lines, comparing them with commercial lipoplexes. METHODS: Positively charged gold nanoparticles were synthesized using PEI as reducing and stabilizer agent and its cytotoxicity reduced by its functionalization with PEG. We bound the nanoparticles to three plasmids with different sizes (4-40 kpb). The vector internalization was evaluated by confocal and electronic microscopy...
June 20, 2017: Journal of Gene Medicine
https://www.readbyqxmd.com/read/28632301/regulation-of-kindling-epileptogenesis-by-hippocampal-toll-like-receptors-2
#15
Jesús-Servando Medel-Matus, Ashley Reynolds, Don Shin, Raman Sankar, Andrey Mazarati
This study examined whether Toll-like receptors 2 (TLR2) contribute to rapid kindling epileptogenesis. A TLR2 agonist, lipoteichoic acid (LTA), LTA antibody (LTA-A), or normal saline (control) was administered daily over 3 consecutive days, unilaterally into ventral hippocampus of adult male Wistar rats. Thirty minutes after the last injection, the animals were subjected to a rapid kindling procedure. The ictogenesis was gauged by comparing afterdischarge threshold (ADT) and afterdischarge duration (ADD) before the treatments, after the treatments prior to kindling, and 24 h after kindling...
June 20, 2017: Epilepsia
https://www.readbyqxmd.com/read/28632179/the-antiproliferative-effect-of-cyclodipeptides-from-pseudomonas-aeruginosa-pao1-on-hela-cells-involves-inhibition-of-phosphorylation-of-akt-and-s6k-kinases
#16
Laura Hernández-Padilla, Dolores Vázquez-Rivera, Luis A Sánchez-Briones, Alma L Díaz-Pérez, José Moreno-Rodríguez, Mario A Moreno-Eutimio, Victor Meza-Carmen, Homero Reyes-De la Cruz, Jesús Campos-García
Pseudomonas aeruginosa PAO1, a potential pathogen of plants and animals, produces the cyclodipeptides cyclo(l-Pro-l-Tyr), cyclo(l-Pro-l-Phe), and cyclo(l-Pro-l-Val) (PAO1-CDPs), whose effects have been implicated in inhibition of human tumor cell line proliferation. Our purpose was to investigate in depth in the mechanisms of HeLa cell proliferation inhibition by the PAO1-CDPs. The results indicate that PAO1-CDPs, both purified individually and in mixtures, inhibited HeLa cell proliferation by arresting the cell cycle at the G0-G1 transition...
June 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28631114/derivatization-of-dextran-for-multiply-charged-ion-formation-and-electrospray-ionization-time-of-flight-mass-spectrometric-analysis
#17
Jesus B Tapia, Hailey A J Hibbard, Melissa M Reynolds
We present the use of a simple, one-pot derivatization to allow the polysaccharide dextran to carry multiple positive charges, shifting its molecular weight distribution to a lower m/z range. We performed this derivatization because molecular weight measurements of polysaccharides by mass spectrometry are challenging because of their lack of readily ionizable groups. The absence of ionizable groups limits proton abstraction and suppresses proton adduction during the ionization process, producing mass spectra with predominantly singly charged metal adduct ions, thereby limiting the detection of large polysaccharides...
June 19, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28631059/trends-in-hiv-risk-testing-and-treatment-among-msm-in-chicago-2004-2014-implications-for-hiv-elimination-planning
#18
Ethan Morgan, Britt Skaathun, Nicola Lancki, Antonio D Jimenez, Jesus Ramirez-Valles, Ramona Bhatia, Stephanie Masiello-Schuette, Nanette Benbow, Nikhil Prachand, John A Schneider
Men who have sex with men (MSM) in the USA continue to have high rates of HIV infection. Increasingly, in addition to behavioral factors, biomedical interventions have been found to play important roles in HIV prevention. In this analysis, we used four waves of cross-sectional data (2004, 2008, 2011, and 2014) from the National HIV Behavioral Surveillance System (NHBS) to examine trends in key behaviors and biomedical interventions among MSM in Chicago (N = 3298). Logistic regression was used to determine changes in behaviors and use of biomedical interventions...
June 19, 2017: Journal of Urban Health: Bulletin of the New York Academy of Medicine
https://www.readbyqxmd.com/read/28630571/predictive-variables-of-half-marathon-performance-for-male-runners
#19
Josué Gómez-Molina, Ana Ogueta-Alday, Jesus Camara, Christoper Stickley, José A Rodríguez-Marroyo, Juan García-López
The aims of this study were to establish and validate various predictive equations of half-marathon performance. Seventy-eight half-marathon male runners participated in two different phases. Phase 1 (n = 48) was used to establish the equations for estimating half-marathon performance, and Phase 2 (n = 30) to validate these equations. Apart from half-marathon performance, training-related and anthropometric variables were recorded, and an incremental test on a treadmill was performed, in which physiological (VO2max, speed at the anaerobic threshold, peak speed) and biomechanical variables (contact and flight times, step length and step rate) were registered...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28630259/triacylglycerol-mimetics-regulate-membrane-interactions-of-glycogen-branching-enzyme-implications-for-therapy
#20
Rafael Alvarez, Jesús Casas, David J López, Maitane Ibarguren, Ariadna Suari-Rivera, Silvia Terés, Francisca Guardiola-Serrano, Alexander Lossos, Xavier Busquets, Or Kakhlon, Pablo V Escribá
Adult Polyglucosan Body Disease (APBD) is a neurological disorder characterized by adult-onset neurogenic bladder, spasticity, weakness, and sensory loss. The disease is caused by aberrant glycogen branching enzyme (GBE1-Y329S) yielding less branched, globular and soluble glycogen which tends to aggregate. We explore here whether, despite being a soluble enzyme, GBE1 activity is regulated by protein-membrane interactions. Since soluble proteins can contact a wide variety of cell membranes, we investigated the interactions of purified wild-type and Y329S GBE1 proteins with different types of model membranes (liposomes)...
June 19, 2017: Journal of Lipid Research
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