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https://www.readbyqxmd.com/read/29784845/interaction-of-bacterial-phenazines-with-colistimethate-in-bronchial-epithelial-cells
#1
Valeri V Mossine, Deborah L Chance, James K Waters, Thomas P Mawhinney
Multidrug-resistant bacterial infections are being increasingly treated in clinics with polymyxins, a class of antibiotics associated with adverse effects in the kidney, nervous system, or airways of a significant proportion of human and animal patients. Although many of the resistant pathogens display enhanced virulence, a hazard of cytotoxic interactions between polymyxin antibiotics and bacterial virulence factors (VFs) has not been assessed, to date. We report here on testing paired combinations of four Pseudomonas aeruginosa VF phenazine toxins, pyocyanin (PYO), 1-hydroxyphenazine (1-HP), phenazine-1-carboxylic acid (PCA), phenazine-1-carboxamide (PCN), and two commonly prescribed polymyxin drugs, colistimethate (CMS)/colistin and polymyxin B, in three human airway cell lines, BEAS-2B, HBE-1, and CFT-1...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29782855/role-of-statins-and-mevalonate-pathway-on-impaired-hdac2-activity-induced-by-oxidative-stress-in-human-airway-epithelial-cells
#2
Maria Gabriella Matera, Luigino Calzetta, Giulia Gritti, Laura Gallo, Brunella Perfetto, Giovanna Donnarumma, Mario Cazzola, Paola Rogliani, Maria Donniacuo, Barbara Rinaldi
In patients with chronic obstructive pulmonary disease (COPD) the inflammatory response is often steroid-resistant, likely since oxidative stress and cigarette smoking impair histone deacetylase 2 (HDAC2) activity. Since it has been demonstrated that statins may restore the HDAC2 activity in cultured human endothelial cells, the aim of this study was to investigate the effects of statins in reversing the steroid-resistance induced by oxidative stress. We evaluated the effects of simvastatin and dexamethasone on HDAC2 expression and activity, and the role of mevalonate and Rho/ROCK pathways in A549 cells, a human lung type II epithelial cell line stressed with H2 O2 ...
May 18, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29778213/nitric-oxide-an-old-molecule-with-noble-functions-in-pseudomonas-aeruginosa-biology
#3
Masanori Toyofuku, Sang-Sun Yoon
Pseudomonas aeruginosa, a Gram-negative bacterium, is characterized by its versatility that enables persistent survival under adverse conditions. It can grow on diverse energy sources and readily acquire resistance to antimicrobial agents. As an opportunistic human pathogen, it also causes chronic infections inside the anaerobic mucus airways of cystic fibrosis patients. As a strict respirer, P. aeruginosa can grow by anaerobic nitrate ( [Formula: see text] ) respiration. Nitric oxide (NO) produced as an intermediate during anaerobic respiration exerts many important effects on the biological characteristics of P...
2018: Advances in Microbial Physiology
https://www.readbyqxmd.com/read/29777682/inhibition-of-bet-bromodomains-restores-corticosteroid-responsiveness-in-a-mixed-granulocytic-mouse-model-of-asthma
#4
Ahmed Nadeem, Sheikh F Ahmad, Naif O Al-Harbi, Nahid Siddiqui, Khalid E Ibrahim, Sabry M Attia
Asthma is a heterogeneous disease characterized by different endotypes/phenotypes. Th2/Th17 driven mixed granulocytic asthma is one of them and shows resistance to corticosteroid therapy. Bromodomain and extra-terminal (BET) proteins are required for differentiation of Th17 cells which play a pivotal role in neutrophilic inflammation. Therefore, we sought to characterize the differential effects of BET inhibitor versus corticosteroids, and their potential synergism in cockroach allergen extract (CE)-induced mixed granulocytic (eosinophilic and neutrophilic) mouse model of asthma having Th2/Th17 endotype...
May 16, 2018: Biochemical Pharmacology
https://www.readbyqxmd.com/read/29775687/effects-of-bronchodilation-on-biomarkers-of-peripheral-airway-inflammation-in-copd
#5
Pierachille Santus, Dejan Radovanovic, Susanna Mascetti, Alessia Pauletti, Vincenzo Valenti, Marco Mantero, Alberto Papi, Marco Contoli
Peripheral airway inflammation and dysfunction are key elements in the pathogenesis of COPD. The exhaled alveolar fraction of nitric oxide (CANO) is an indirect biomarker of lung peripheral inflammation. We tested whether inhaled long-acting bronchodilators (LABA) can affect CANO and we evaluated correlations with lung mechanics in patients with COPD. Two-centre, randomised, double blind, crossover study including COPD patients with moderate-to-severe airflow obstruction. Following a pharmacological washout, multi-flow exhaled fraction of NO (FENO), plethysmography, lung diffusion (DLCO), single breath nitrogen washout test and dyspnoea were measured in a crossover manner at baseline and 30, 60 and 180 minutes following administration of salmeterol (Sal) or formoterol fumarate (FF)...
May 15, 2018: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/29773293/usefulness-of-the-forced-oscillation-technique-in-assessing-the-therapeutic-result-of-tracheobronchial-central-airway-obstruction
#6
Masanori Yasuo, Yoshiaki Kitaguchi, Fumiya Kinota, Makoto Kosaka, Kazuhisa Urushihata, Atsuhito Ushiki, Hiroshi Yamamoto, Satoshi Kawakami, Masayuki Hanaoka
BACKGROUND: Pulmonary function tests (PFTs) comprise the traditional method for detecting central airway obstruction (CAO) and evaluating therapeutic effects, but are effort-dependent. By contrast, the forced oscillation technique (FOT) is performed during tidal breathing in an effort-independent mode and is universally used to assess respiratory function in patients with chronic obstructive pulmonary disease (COPD) and asthma. We used the FOT to measure airway resistance and reactance in patients with CAO before and after interventional bronchoscopy and compared the results to data obtained using PFTs...
May 2018: Respiratory Investigation
https://www.readbyqxmd.com/read/29771599/clinical-characterization-of-children-with-resistant-airflow-obstruction-a-multicenter-study
#7
Sankaran Krishnan, Allen J Dozor, Leonard Bacharier, Jason E Lang, Charles G Irvin, David Kaminsky, Harold J Farber, Lynn Gerald, Mark Brown, Janet T Holbrook, Robert A Wise, Julie Ryu, Sonali Bose, Yasin Razan, Joy Saams, Robert J Henderson, William G Teague
OBJECTIVE: To characterize a cohort of children with airflow limitation resistant to bronchodilator (BD) therapy. METHODS: Pulmonary function tests performed in children 6-17 years of age at 15 centers in a clinical research consortium were screened for resistant airflow limitation, defined as a post-BD FEV1 and/or an FEV1 /FVC less than the lower limits of normal. Demographic and clinical data were analyzed for associations with pulmonary function. RESULTS: 582 children were identified...
May 17, 2018: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/29769485/changes-of-peak-expiratory-flow-rate-in-adult-asthmatic-patient
#8
S Nasreen, A Nessa, F Islam, A Khanam, R Sultana, R Rahman, M Hossain
Asthma is a common pulmonary disorder characterizerized by airway inflammation, airway- hyper reactivity, and reversible airflow obstruction. The classic triad of symptoms is wheezing, chronic episodic dyspnea and chronic cough. The prevalence of asthma increased steadily over the latter part of the last century, first in the developed and then in the developing world. The number of people with asthma in the world may be as high as 334 million. Asthma in Bangladesh appears to be a substantial public health problem: an estimated 11...
April 2018: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29769279/microbial-interactions-in-the-cystic-fibrosis-airway
#9
Ann M Granchelli, Frederick R Adler, Ruth H Keogh, Christiana Kartsonaki, David R Cox, Theodore G Liou
Interactions in the airway ecology of cystic fibrosis may alter organism persistence and clinical outcomes. Better understanding of such interactions could guide clinical decisions. We fitted logistic regression models using generalized estimating equations to longitudinal two-year patient cohorts in the Cystic Fibrosis Foundation Patient Registry, 2003-2011 to study associations between airway organisms present in each calendar year and their presence in the subsequent year. Models were adjusted for clinical characteristics and multiple observations per patient and tested for sensitivity to cystic fibrosis-specific treatments...
May 16, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29768730/biofilm-in-voice-prosthesis-a-prospective-cohort-study-and-laboratory-tests-using-sonication-and-sem-analysis
#10
Jacopo Galli, Lea Calo', Duino Meucci, Monica Giuliani, Daniela Lucidi, Gaetano Paludetti, Riccardo Torelli, Maurizio Sanguinetti, Claudio Parrilla
OBJECTIVE: The objective of the study was to compare the biofilm growing pattern and its morphological extent on silicone and a teflon-like material using a sonication process and a Scanning Electron Microscope (SEM). DESIGN: A prospective cohort study and a laboratory study. SETTING: Otolaryngology -Head and Neck surgery Department and the Microbiology Institute. PARTICIPANTS: The participants included fifteen laryngectomized patients with phonatory prostheses, which were removed due to device failure, and two different kinds of phonatory prostheses from the laboratory (Provox 2 and ActiValve) that were artificially colonized by Candida albicans...
May 16, 2018: Clinical Otolaryngology
https://www.readbyqxmd.com/read/29768512/infant-cpap-for-low-income-countries-an-experimental-comparison-of-standard-bubble-cpap-and-the-pumani-system
#11
Markus Falk, Snorri Donaldsson, Thomas Drevhammar
INTRODUCTION: Access to inexpensive respiratory support to newborn infants improves survival in low-income countries. Standard bubble continuous positive airway pressure (CPAP) has been extensively used worldwide for more than 30 years. One project aimed at providing affordable CPAP is the Pumani system developed by Rice 360°. Compared to standard bubble CPAP the system has an unconventional design. The aim was to compare the Pumani system with two traditional bubble CPAP systems, focusing on in-vitro performance and safety...
2018: PloS One
https://www.readbyqxmd.com/read/29765510/correlation-between-metabolic-syndrome-and-sleep-apnea
#12
REVIEW
Alejandro Castaneda, Edgar Jauregui-Maldonado, Iqbal Ratnani, Joseph Varon, Salim Surani
The so-called "metabolic syndrome" (MS), constitutes a cluster of metabolic and cardiovascular abnormalities, including fasting glucose, blood pressure, triglycerides, high density lipoprotein cholesterol (HDL-C), and waist circumference that arise from insulin resistance. Obstructive sleep apnea (OSA) syndrome is characterized by recurrent episodes of partial or complete obstruction of the upper airway, involving cessation or significant decreased airflow, with intermittent hypoxemia, frequent arousals from sleep and recurrent oxyhemoglobin desaturations that interfere with normal sleep patterns generating difficulty falling asleep, unrefreshing sleep and loud snoring...
April 15, 2018: World Journal of Diabetes
https://www.readbyqxmd.com/read/29765214/tiotropium-inhibits-methacholine-induced-extracellular-matrix-production-via-%C3%AE-catenin-signaling-in-human-airway-smooth-muscle-cells
#13
Yating Huo, Lili Guan, Jiawen Xu, Luqian Zhou, Rongchang Chen
Background: Airway remodeling is an important feature of chronic obstructive pulmonary disease (COPD) that is associated with disease severity and irreversible airflow limitation. An extensive alteration of the extracellular matrix (ECM) surrounding the airway smooth muscle (ASM) bundle is one of the pathological manifestations of airway remodeling, which contributes to the decline in lung function. Tiotropium, a long-acting inhaled muscarinic receptor antagonist, has been confirmed to play a role in preventing airway remodeling including ECM deposition beyond bronchodilation in vivo, but the relationship between ASM cell (ASMC) relaxation and ECM production remains unclear...
2018: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29752649/risk-factors-for-pneumonia-due-to-beta-lactam-susceptible-and-beta-lactam-resistant-pseudomonas-aeruginosa-a-case-case-control-study
#14
Mohammed J Al-Jaghbeer, Julie Ann Justo, William Owens, Joseph Kohn, P Brandon Bookstaver, Jennifer Hucks, Majdi N Al-Hasan
PURPOSE: This case-case-control study aims to identify clinical predictors for pneumonia due to Pseudomonas aeruginosa (PA) which is (1) susceptible to all routinely tested antipseudomonal beta-lactams (APBL-S) and (2) resistant to at least one antipseudomonal beta-lactam (APBL-R). METHODS: Hospitalized adults with acute bacterial pneumonia at Palmetto Health hospitals in Columbia, SC, USA from January 1, 2012 to April 15, 2014 were identified. Multivariate logistic regression was used to determine risk factors for pneumonia due to APBL-S PA and APBL-R PA...
May 11, 2018: Infection
https://www.readbyqxmd.com/read/29748304/tobacco-smoke-exposure-in-early-life-and-adolescence-in-relation-to-lung-function
#15
Jesse D Thacher, Erica S Schultz, Jenny Hallberg, Ulrika Hellberg, Inger Kull, Per Thunqvist, Göran Pershagen, Per M Gustafsson, Erik Melén, Anna Bergström
Maternal smoking during pregnancy is associated with impaired lung function among young children, but less is known about long-term effects and the impact of adolescents' own smoking. We investigated the influence of maternal smoking during pregnancy, secondhand smoke exposure, and adolescent smoking on lung function at age 16 years.The BAMSE birth cohort collected information on participant's tobacco smoke exposure through repeated questionnaires, and measured saliva cotinine concentrations at age 16. Participants performed spirometry and impulse oscillometry (IOS) at age 16 (n=2295)...
May 10, 2018: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/29742906/relationship-of-spirometric-body-plethysmographic-and-diffusing-capacity-parameters-to-emphysema-scores-derived-from-ct-scans
#16
Kathrin Kahnert, Bertram Jobst, Frank Biertz, Jürgen Biederer, Henrik Watz, Rudolf M Huber, Jürgen Behr, Philippe A Grenier, Peter Alter, Claus F Vogelmeier, Hans-Ulrich Kauczor, Rudolf A Jörres
Phenotyping of chronic obstructive pulmonary disease (COPD) with computed tomography (CT) is used to distinguish between emphysema- and airway-dominated type. The phenotype is reflected in correlations with lung function measures. Among these, the relative value of body plethysmography has not been quantified. We addressed this question using CT scans retrospectively collected from clinical routine in a large COPD cohort. Three hundred and thirty five patients with baseline data of the German COPD cohort COPD and Systemic Consequences-Comorbidities Network were included...
January 1, 2018: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/29734983/the-effects-of-experimental-sleep-fragmentation-and-sleep-deprivation-on-the-response-of-the-genioglossus-muscle-to-inspiratory-resistive-loads
#17
Jennifer M Cori, Christian L Nicholas, Joanne Avraam, V Vien Lee, Rachel Schembri, Melinda L Jackson, Amy S Jordan
STUDY OBJECTIVES: Poor upper airway dilator muscle function may contribute to obstructive sleep apnea (OSA). Sleep deprivation reduces dilator muscle responsiveness, but sleep fragmentation, which is most characteristic of OSA, has not been assessed. This study compared the effects of sleep deprivation and fragmentation on dilator muscle responsiveness during wakefulness. METHOD: Twenty-four healthy individuals (10 female) participated in two consecutive overnight polysomnography (PSG) sessions...
April 30, 2018: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/29734977/use-of-chest-wall-emg-to-classify-hypopneas-as-obstructive-or-central
#18
Richard B Berry, Scott Ryals, Mary H Wagner
STUDY OBJECTIVES: To compare classification of hypopneas as obstructive or central based on an effort signal derived from surface chest wall electromyography (CW-EMG-EF) coupled with airflow amplitude versus classification using The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications (AASM Scoring Manual) criteria; and to characterize hypopneas classified as obstructive versus central using a resistance surrogate. METHODS: CW-EMG was recorded in the eighth intercostal space at the right midaxillary line...
April 30, 2018: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/29734941/infective-endocarditis-due-to-burkholderia-cepacia-in-a-neonate-a-case-report
#19
Emir Yonas, Vito Damay, Raymond Pranata, Nuvi Nusarintowati
BACKGROUND: Burkholderia is a pathogen that is rarely seen in clinical cases. However, this organism is being found more commonly in hospitals. CASE PRESENTATION: A female Indonesian newborn was referred to our neonatal intensive care unit because of respiratory distress. The newborn had been delivered the previous night via cesarean section. A physical examination revealed intercostal retractions and weak cry. The newborn's gestational history was preterm, small for gestational age, and preterm premature ruptured membrane for 14 hours...
May 8, 2018: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29728414/t-piece-resuscitators-how-do-they-compare
#20
Murray Hinder, Alistair McEwan, Thomas Drevhammer, Snorri Donaldson, Mark Brian Tracy
BACKGROUND: The T-piece resuscitator (TPR) has seen increased use as a primary resuscitation device with newborns. Traditional TPR design uses a high resistance expiratory valve to produce positive end expiratory pressure (PEEP) or continuous positive airway pressure (CPAP) at resuscitation. A new TPR device that uses a dual flow ratio valve (fluidic flip) to produce PEEP/CPAP is now available (rPAP). We aimed to compare the measured ventilation performance of different TPR devices in a controlled bench test study...
May 4, 2018: Archives of Disease in Childhood. Fetal and Neonatal Edition
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