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https://www.readbyqxmd.com/read/28937231/pulmonary-surfactant-and-bacterial-lipopolysaccharide-the-interaction-and-its-functional-consequences
#1
M Kolomaznik, Z Nova, A Calkovska
The respiratory system is constantly exposed to pathogens which enter the lungs by inhalation or via blood stream. Lipopolysaccharide (LPS), also named endotoxin, can reach the airspaces as the major component of the outer membrane of Gram-negative bacteria, and lead to local inflammation and systemic toxicity. LPS affects alveolar type II (ATII) cells and pulmonary surfactant and although surfactant molecule has the effective protective mechanisms, excessive amount of LPS interacts with surfactant film and leads to its inactivation...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28935640/attenuation-of-pulmonary-ace2-activity-impairs-inactivation-of-des-arg9-bradykinin-bkb1r-axis-and-facilitates-lps-induced-neutrophil-infiltration
#2
Chhinder P Sodhi, Christine Wohlford-Lenane, Yukihiro Yamaguchi, Thomas Prindle, William B Fulton, Sanxia Wang, Paul B McCray, Mark C Chappell, David J Hackam, Hongpeng Jia
Angiotensin converting enzyme 2 (ACE2) is a terminal carboxypeptidase with important functions in the renin angiotensin system and plays a critical role in inflammatory lung diseases. ACE2 cleaves single terminal residues from several bioactive peptides such as angiotensin II. However, few of its substrates in the respiratory tract have been identified and the mechanism underlying the role of ACE2 in inflammatory lung disease has not been fully characterized. In an effort to identify biological targets of ACE2 in the lung, we tested its effects on des-arg9 bradykinin (DABK) in airway epithelial cells based upon a hypothesis that DABK is a biological substrate of ACE2 in the lung and ACE2 plays an important role in the pathogenesis of acute lung inflammation partly through modulating DABK/BKB1R axis signaling...
September 21, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28933915/airway-epithelial-barrier-dysfunction-in-copd-role-of-cigarette-smoke-exposure
#3
Mahyar Aghapour, Pourya Raee, Seyed Javad Moghaddam, Pieter S Hiemstra, Irene H Heijink
The epithelial lining of the airway forms the first barrier against environmental insults such as inhaled cigarette smoke, which is the primary risk factor for the development of chronic obstructive pulmonary disease (COPD). The barrier is formed by airway epithelial junctions, which are interconnected structures that restrict permeability to inhaled pathogens and environmental stressors. Destruction of the epithelial barrier not only exposes subepithelial layers to hazardous agents in the inspired air, but also alters the normal function of epithelial cells, which may eventually contribute to the development of COPD...
September 21, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28929951/the-fate-of-inhaled-nanoparticles-detection-and-measurement-by-enhanced-dark-field-microscopy
#4
Robert R Mercer, James F Scabilloni, Liying Wang, Lori A Battelli, James M Antonini, Jenny R Roberts, Yong Qian, Jennifer D Sisler, Vincent Castranova, Dale W Porter, Ann F Hubbs
Assessing the potential health risks for newly developed nanoparticles poses a significant challenge. Nanometer-sized particles are not generally detectable with the light microscope. Electron microscopy typically requires high-level doses, above the physiologic range, for particle examination in tissues. Enhanced dark-field microscopy (EDM) is an adaption of the light microscope that images scattered light. Nanoparticles scatter light with high efficiency while normal tissues do not. EDM has the potential to identify the critical target sites for nanoparticle deposition and injury in the lungs and other organs...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/28926874/-multicenter-epidemiological-investigation-of-hospitalized-elderly-young-and-middle-aged-patients-with-severe-burn
#5
Y Tang, L X Wang, W G Xie, Z A Shen, G H Guo, J J Chen, C M Han, L C Ren, Z G Chu, M F Yin, Y Wang, D X Zhang, Y S Huang, J P Zhang
Objective: To compare and analyze the epidemiological characteristics of hospitalized elderly, young and middle-aged patients with severe burn in recent years, so as to provide reference for the prevention and treatment of elderly patients with severe burn. Methods: Relying on the entry system of epidemiological case data and biological sample of severe burn from multicenter in clinic, medical records of patients with severe burn, aged above 18, hospitalized in 8 burn wards from January 2012 to December 2015 were collected...
September 20, 2017: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/28915216/protection-by-inhaled-hydrogen-therapy-in-a-rat-model-of-acute-lung-injury-can-be-tracked-in-vivo-using-molecular-imaging
#6
Said H Audi, Elizabeth R Jacobs, Xiao Zhang, Amadou K S Camara, Ming Zhao, Meetha M Medhora, Benjamin Rizzo, Anne V Clough
Inhaled hydrogen gas (H2) provides protection in rat models of human acute lung injury (ALI). We previously reported that biomarker imaging can detect oxidative stress and endothelial cell death in vivo in a rat model of ALI. Our objective was to evaluate the ability of Tc-hexamethylpropyleneamineoxime (HMPAO) and Tc-duramycin to track the effectiveness of H2 therapy in vivo in the hyperoxia rat model of ALI. Rats were exposed to room air (normoxia), 98% O2 + 2% N2 (hyperoxia) or 98% O2 + 2% H2 (hyperoxia+H2) for up to 60 h...
October 2017: Shock
https://www.readbyqxmd.com/read/28912380/exposure-of-neonatal-mice-to-bromine-impairs-their-alveolar-development-and-lung-function
#7
Tamas Jilling, Changchun Ren, Aaron Jefthy Yee, Saurabh Aggarwal, Brian Halloran, Namasivayam Ambalavanan, Sadis Matalon
The halogen bromine (Br2) is used extensively in industry and stored and transported in large quantities. Its accidental or malicious release into the atmosphere has resulted in significant casualties. The pathophysiology of Br2-induced lung injury has been studied in adult animals, but the consequences of Br2 exposure to the developing lung are completely unknown. We exposed neonatal mouse littermates on postnatal day 3 (P3) to either Br2 at 400 ppm for 30 minutes (400/30), to Br2 at 600 ppm for 30 minutes (600/30), or to room air, then returned them to their dams and observed until P14...
September 14, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/28905528/humidifier-disinfectant-associated-lung-injury-six-years-after-the-tragic-event
#8
REVIEW
Won Young Kim, Sang Bum Hong
In 2011, a cluster of peripartum patients were admitted to the intensive care unit of a tertiary hospital in Seoul with signs and symptoms of severe respiratory distress of unknown etiology. Subsequent epidemiological and animal studies suggested that humidifier disinfectant (HD) might represent the source of this pathology. Epidemiological studies, animal studies, and dose-response analysis demonstrated a strong association between HD use and lung injuries. The diagnostic criteria for HD-associated lung injury (HDALI) was defined on the basis of the clinical, pathological, and radiological attributes of the patients...
September 1, 2017: Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/28905185/hepatotoxicity-of-monoterpenes-and-sesquiterpenes
#9
REVIEW
Tomáš Zárybnický, Iva Boušová, Martin Ambrož, Lenka Skálová
Public interest in natural therapies has increased significantly over past decades. Herbs and herbal products are extensively consumed worldwide and they are generally considered as safe. However, this may not always be true as many cases of herb-induced liver injury are reported every year. The liver is a frequent target tissue of toxicity from all classes of toxicants as liver structure and function predispose it to high sensitivity to xenobiotics. The present review is focused on the hepatotoxic properties of monoterpenes and sesquiterpenes, plant secondary metabolites that represent the major components of essential oils wildly used in folk medicines, pharmaceutical industry and cosmetics...
September 13, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28900039/the-contributing-risk-of-tobacco-use-for-ards-development-in-burn-injured-adults-with-inhalation-injury
#10
Majid Afshar, Giora Netzer, Michael J Mosier, Richard S Cooper, William Adams, Ellen L Burnham, Elizabeth J Kovacs, Ramon Durazo-Arvizu, Stephanie Kliethermes
BACKGROUND: This study aims to determine the relationship between tobacco use, inhalation injury, and ARDS in burn-injured adults. METHODS: This study was an observational cohort of 2,485 primary burn admissions to a referral burn center between January 1, 2008 and March 15, 2015. Subjects were evaluated by methods used to account for mediation and traditional approaches (multivariable logistic regression and propensity score analysis). Mediation analysis examined both the (1) indirect effect of tobacco use via inhalation injury as the mediator on ARDS development and (2) the direct effect of tobacco use alone on ARDS development...
September 12, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28890242/asphyxiation-death-caused-by-oxygen-depleting-cargo-on-a-ship
#11
Marjana Kjetland Sundal, Peer Kaare Lilleng, Hans Barane, Inge Morild, Merete Vevelstad
The extreme danger associated with entering enclosed spaces loaded with oxygen-depleting organic cargo in ships and tanks is obviously underestimated, both among crew and management. We present a case report to highlight this occupational hazard and to increase the knowledge about the imperative precautions, in order to prevent future accidents. An experienced customs officer was found lifeless at the bottom of the unattended cargo hold on a ship loaded with woodchips. The oxygen content in the cargo atmosphere was below 2%, which is incompatible with life...
September 1, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28887033/long-term-exposure-to-pm2-5-lowers-influenza-virus-resistance-via-down-regulating-pulmonary-macrophage-kdm6a-and-mediates-histones-modification-in-il-6-and-ifn-%C3%AE-promoter-regions
#12
Jing-Hui Ma, Shao-Hua Song, Meng Guo, Ji Zhou, Fang Liu, Li Peng, Zhi-Ren Fu
Atmospheric particulates, especially PM2.5, not only damage the respiratory system, but also play important roles in pulmonary immunity. China is influenced by atmospheric diffusion conditions, industrial manufacturers, and heating and discharging. PM2.5 levels in the air rise substantially in the winter, which is also a period of flu high-incidence. Although an epidemiological link exists between PM2.5 and flu, we do not understand how long-term PM2.5 inhalation affects pulmonary immunity and the influenza virus response...
September 5, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28886691/impaired-response-of-the-bronchial-epithelium-to-inflammation-characterizes-severe-equine-asthma
#13
Laurence Tessier, Olivier Côté, Mary Ellen Clark, Laurent Viel, Andrés Diaz-Méndez, Simon Anders, Dorothee Bienzle
BACKGROUND: Severe equine asthma is a naturally occurring lung inflammatory disease of mature animals characterized by neutrophilic inflammation, bronchoconstriction, mucus hypersecretion and airway remodeling. Exacerbations are triggered by inhalation of dust and microbial components. Affected animals eventually are unable of aerobic performance. In this study transcriptomic differences between asthmatic and non-asthmatic animals in the response of the bronchial epithelium to an inhaled challenge were determined...
September 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28877030/radiation-mitigating-properties-of-intranasally-administered-kl4-surfactant-in-a-murine-model-of-radiation-induced-lung-damage
#14
Melpo Christofidou-Solomidou, Ralph A Pietrofesa, Evguenia Arguiri, Constantinos Koumenis, Robert Segal
The threat of exposure to ionizing radiation from a nuclear reactor accident or deliberate terrorist actions is a significant public health concern. The lung is particularly susceptible to radiation-induced injury from external sources or inhalation of radioactive particles from radioactive fallout. Radiation-induced lung disease can manifest with an acute radiation pneumonitis and/or delayed effects leading to pulmonary fibrosis. As prior warning of radiation exposure is unlikely, medical countermeasures (MCMs) to mitigate radiation-induced lung disease that can be given in mass-casualty situations many hours or days postirradiation are needed to prevent both early and late lung damage...
September 6, 2017: Radiation Research
https://www.readbyqxmd.com/read/28876693/continuation-of-feeds-in-the-unstable-burns-patient
#15
A L Rooi, A Muganza, E A Ndobe, M Nel
BACKGROUND: Early enteral nutrition (EEN) and the continuation of enteral nutrition (EN) are critical factors in burn patients, who typically have higher nutritional needs due to their post-injury hypercatabolic state and their additional need for nutrients to aid in the healing of wounds and skin grafts. In the critically ill patient, EN is the preferred mode of administration; however, controversy exists regarding the concomitant use of EN and intravenous vasopressor agents in the haemodynamically unstable patient...
June 2017: South African Journal of Surgery. Suid-Afrikaanse Tydskrif Vir Chirurgie
https://www.readbyqxmd.com/read/28873369/dexmedetomidine-alleviates-hyperoxia-induced-acute-lung-injury-via-inhibiting-nlrp3-inflammasome-activation
#16
Qiuyue Zhang, Di Wu, Yang Yang, Tingting Liu, Hongyu Liu
BACKGROUND/AIMS: Dexmedetomidine (Dex), a specific agonist of α2-adrenoceptor, has been reported to have extensive pharmacological effects. In this study, we focused on the protective effect of Dex on hyperoxia-induced acute lung injury and further explored its possible molecular mechanisms. METHODS: The model of hyperoxia-induced acute lung injury was established by continuous inhalation of oxygen (FiO2= 0.90) for 7 d in neonatal rats in vivo. The in vitro experiments were carried out in LPS/ATP or hyperoxia-treated RAW264...
August 3, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28846992/improving-research-enrollment-of-severe-burn-patients
#17
Anne M Lachiewicz, Felicia N Williams, Shannon S Carson, Jessica M Trexler, Carrie A Nielsen, David van Duin, David J Weber, Shannon D Williams, Samuel W Jones, Bruce A Cairns
Enrolling severely burn injured patients into prospective research studies poses specific challenges to investigators. The authors describe their experience of recruiting adults with ≥20% TBSA burns or inhalation injury admitted to a single academic burn unit into observational research with minimally invasive specimen collection. The authors outline iterative changes that they made to their recruitment processes in response to perceived weaknesses leading to delays in enrollment. The primary outcome was the change in days to consent for enrolled patients or cessation of recruitment for nonenrolled patients before and after the interventional modifications...
September 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28846437/oxygen-administration-improves-survival-but-worsens-cardiopulmonary-functions-in-chlorine-exposed-rats
#18
Obiefuna C Okponyia, Matthew D McGraw, Marilyn M Dysart, Rhonda B Garlick, Jacqueline S Rioux, Angela L Murphy, Gates B Roe, Carl W White, Livia A Veress
RATIONALE: Chlorine is a highly reactive gas that can cause significant injury when inhaled. Unfortunately, its use as a chemical weapon has increased in recent years. Massive chlorine inhalation can cause death within 4h of exposure. Survivors usually require hospitalization after massive exposure. No countermeasures exist for massive chlorine exposure, and supportive care measures lack controlled trials. METHODS: Adult rats were exposed to chlorine gas (LD58-67) in a whole-body exposure chamber, and given oxygen (0...
August 28, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28839491/non-coding-rnas-are-differentially-expressed-by-nocardia-brasiliensis-in-vitro-and-in-experimental-actinomycetoma
#19
Josué S Cruz-Rabadán, Juan Miranda-Ríos, Guadalupe Espín-Ocampo, Luis J Méndez-Tovar, Héctor Rubén Maya-Pineda, Francisca Hernández-Hernández
INTRODUCTION: Nocardia spp. are common soil-inhabiting bacteria that frequently infect humans through traumatic injuries or inhalation routes and cause infections, such as actinomycetoma and nocardiosis, respectively. Nocardia brasiliensis is the main aetiological agent of actinomycetoma in various countries. Many bacterial non-coding RNAs are regulators of genes associated with virulence factors. OBJECTIVE: The aim of this work was to identify non-coding RNAs (ncRNAs) expressed during infection conditions and in free-living form (in vitro) in Nocardia brasiliensis...
2017: Open Microbiology Journal
https://www.readbyqxmd.com/read/28832892/bronchial-wheezing-predicts-inflammation-and-respiratory-failure-in-fire-smoke-victims
#20
E R Nakstad, H C D Aass, H Opdahl, A Witsø, F Borchsenius, F Heyerdahl, O H Skjønsberg
BACKGROUND: Acute fire smoke inhalation injury involves inflammatory mediators whose roles are poorly understood. We carried out a prospective observational study of fire smoke victims to identify clinical and biochemical markers that may predict pulmonary dysfunction and investigated possible correlations between dysfunction and cytokines in bronchoalveolar lavage (BAL) fluid and blood. METHODS: Forty patients with respiratory and/or neurological symptoms following acute fire smoke inhalation had pulmonary function tests and blood gas analyses performed on admission, at discharge, and after 3 months...
August 17, 2017: Acta Anaesthesiologica Scandinavica
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