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Inappropriate oxygen

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https://www.readbyqxmd.com/read/28819370/metformin-inhibits-gemcitabine-induced-apoptosis-in-pancreatic-cancer-cell-lines
#1
Dietmar Zechner, Ann-Christin Albert, Florian Bürtin, Brigitte Vollmar
Many preclinical and clinical studies are currently evaluating metformin in combination with classical therapeutic agents as anti-cancer therapy. In this study we used three distinct pancreatic cancer cell lines and evaluated cell death by trypan blue assay and Western Blots using antibodies directed against cleaved caspase 3 and PARP. Surprisingly, we observed that 20mM metformin did not enhance, but rather inhibited gemcitabine induced cell death in murine 7265PDA, 6606PDA and 6606l cells. Microenvironmental aspects such as oxygen supply or the pH value did not influence the inhibition of cancer cell apoptosis by metformin...
2017: Journal of Cancer
https://www.readbyqxmd.com/read/28750686/carbon-dioxide-narcosis-due-to-inappropriate-oxygen-delivery-a-case-report
#2
Thomas Herren, Eva Achermann, Thomas Hegi, Adrian Reber, Max Stäubli
BACKGROUND: Oxygen delivery to patients with chronic obstructive pulmonary disease may be challenging because of their potential hypoxic ventilatory drive. However, some oxygen delivery systems such as non-rebreathing face masks with an oxygen reservoir bag require high oxygen flow for adequate oxygenation and to avoid carbon dioxide rebreathing. CASE PRESENTATION: A 72-year-old Caucasian man with severe chronic obstructive pulmonary disease was admitted to the emergency department because of worsening dyspnea and an oxygen saturation of 81% measured by pulse oximetry...
July 28, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28744782/storage-of-nitroglycerin-ntg-admixed-with-hboc-201-for-30%C3%A2-days-in-polyolefin-plastic-bags-a-pilot-study
#3
Savita Nigam, Richard McCarron, Francoise Arnaud
Hemorrhaged animals have benefited from resuscitation with the hemoglobin-based oxygen carrier (HBOC-201). Co-infusion of nitric oxide (NO) via separate intravascular lines is effective in attenuating HBOC-induced elevation of blood pressure. We tested whether nitroglycerin (NTG) and HBOC-201 can be packaged together as a single drug for resuscitation. Since NTG binds easily to plastics such as polyvinylchloride, we assessed the stability of this combination in oxygen barrier double-layer ethylene-vinyl alcohol/polyolefin bags over a 30-day period...
July 25, 2017: Drug Delivery and Translational Research
https://www.readbyqxmd.com/read/28705991/oxygen-metabolism-and-innate-immune-responses-in-the-gut
#4
Sean Patrick Colgan, Eric L Campbell
Epithelial cells of the mucosa provide a first line of protection against the inappropriate flux of antigens from the outside world. In the gastrointestinal (GI) tract, this barrier is provided at a number of levels, including mucus production, epithelial junctional complexes and the production of antimicrobial molecules. In recent years, it is better appreciated that tissue oxygen metabolism is key to homeostasis in the mucosa. The intestine, for example, maintains a low baseline pO2 levels due to counter-current blood flow and the presence of large numbers of bacteria...
July 13, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28690552/the-role-of-reactive-oxygen-species-and-autophagy-in-periodontitis-and-their-potential-linkage
#5
REVIEW
Chengcheng Liu, Longyi Mo, Yulong Niu, Xin Li, Xuedong Zhou, Xin Xu
Periodontitis is a chronic inflammatory disease that causes damage to periodontal tissues, which include the gingiva, periodontal ligament, and alveolar bone. The major cause of periodontal tissue destruction is an inappropriate host response to microorganisms and their products. Specifically, a homeostatic imbalance between reactive oxygen species (ROS) and antioxidant defense systems has been implicated in the pathogenesis of periodontitis. Elevated levels of ROS acting as intracellular signal transducers result in autophagy, which plays a dual role in periodontitis by promoting cell death or blocking apoptosis in infected cells...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28684719/reactive-oxygen-and-nitrogen-species-in-the-development-of-pulmonary-hypertension
#6
REVIEW
David J R Fulton, Xueyi Li, Zsuzsanna Bordan, Stephen Haigh, Austin Bentley, Feng Chen, Scott A Barman
Pulmonary arterial hypertension (PAH) is a progressive disease of the lung vasculature that involves the loss of endothelial function together with inappropriate smooth muscle cell growth, inflammation, and fibrosis. These changes underlie a progressive remodeling of blood vessels that alters flow and increases pulmonary blood pressure. Elevated pressures in the pulmonary artery imparts a chronic stress on the right ventricle which undergoes compensatory hypertrophy but eventually fails. How PAH develops remains incompletely understood and evidence for the altered production of reactive oxygen and nitrogen species (ROS, RNS respectively) in the pulmonary circulation has been well documented...
July 6, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28682957/the-new-world-health-organization-recommendations-on-perioperative-administration-of-oxygen-to-prevent-surgical-site-infections-a-dangerous-reductionist-approach
#7
Manuel Wenk, Hugo Van Aken, Alexander Zarbock
In October 2016, the World Health Organization (WHO) published recommendations for preventing surgical site infections (SSIs). Among those measures is a recommendation to administer oxygen at an inspired fraction of 80% intra- and postoperatively for up to 6 hours. SSIs have been identified as a global health problem, and the WHO should be commended for their efforts. However, this recommendation focuses only on the patient's "wound," ignores other organ systems potentially affected by hyperoxia, and may ultimately worsen patient outcomes...
August 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28678861/ecstasy-induces-reactive-oxygen-species-kidney-water-absorption-and-rhabdomyolysis-in-normal-rats-effect-of-n-acetylcysteine-and-allopurinol-in-oxidative-stress-and-muscle-fiber-damage
#8
Ana C de Bragança, Regina L M Moreau, Thales de Brito, Maria H M Shimizu, Daniele Canale, Denise A de Jesus, Ana M G Silva, Pedro H Gois, Antonio C Seguro, Antonio J Magaldi
BACKGROUND: Ecstasy (Ec) use produces hyperthermia, excessive sweating, intense thirst, an inappropriate antidiuretic hormone secretion (SIADH) and a multisystemic toxicity due to oxidative stress (OS). Intense thirst induces high intake of pure water, which associated with SIADH, usually develops into acute hyponatremia (Hn). As Hn is induced rapidly, experiments to check if Ec acted directly on the Inner Medullary Collecting Ducts (IMCD) of rats were conducted. Rhabdomyolysis and OS were also studied because Ec is known to induce Reactive Oxygen Species (ROS) and tissue damage...
2017: PloS One
https://www.readbyqxmd.com/read/28661184/redox-dependent-regulation-of-sulfur-metabolism-in-biomolecules-implications-for-cardiovascular-health
#9
Alison Brewer, Rajesh Kumar Mistry
SIGNIFICANCE: Sulfur-containing amino acids are integral to the molecular mechanisms which underlie many aspects of cellular function and homeostasis, facilitated by reversible changes in the oxidation states of the sulfur atoms. Sulfur-containing amino acids are metabolically linked by interacting pathways which impact upon the one-carbon metabolic cycle and the generation of methyl groups, the folate cycle and the maintenance of the major cellular redox buffer; glutathione. Dysregulation of these pathways is associated with diverse pathologies, notably of the cardiovascular system, that are typically characterised by inappropriate plasma levels of sulfur-containing amino acids...
June 29, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28641321/identifying-and-acting-on-potentially-inappropriate-care-inadequacy-of-current-hospital-coding-for-this-task
#10
P David Cooper, David R Smart
INTRODUCTION: Recent Australian attempts to facilitate disinvestment in healthcare, by identifying instances of 'inappropriate' care from large Government datasets, are subject to significant methodological flaws. Amongst other criticisms has been the fact that the Government datasets utilized for this purpose correlate poorly with datasets collected by relevant professional bodies. Government data derive from official hospital coding, collected retrospectively by clerical personnel, whilst professional body data derive from unit-specific databases, collected contemporaneously with care by clinical personnel...
June 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28546657/statins-reduce-lipopolysaccharide-induced-cytokine-and-inflammatory-mediator-release-in-an-in-vitro-model-of-microglial-like-cells
#11
A J McFarland, A K Davey, S Anoopkumar-Dukie
The anti-inflammatory effects of statins (HMG-CoA reductase inhibitors) within the cardiovascular system are well-established; however, their neuroinflammatory potential is unclear. It is currently unknown whether statins' neurological effects are lipid-dependent or due to pleiotropic mechanisms. Therefore, the assumption that all statin compounds will have the same effect within the central nervous system is potentially inappropriate, with no studies to date having compared all statins in a single model. Thus, the aim of this study was to compare the effects of the six statins (atorvastatin, fluvastatin, pitavastatin, pravastatin, rosuvastatin, and simvastatin) within a single in vitro model of neuroinflammation...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28480557/molecular-regulation-of-cellular-iron-balance
#12
REVIEW
Stefania Recalcati, Elena Gammella, Paolo Buratti, Gaetano Cairo
Handling a life-supporting yet redox-active metal like iron represents a significant challenge to cells and organisms that must not only tightly balance intra- and extracellular iron concentrations but also chaperone it during its journey from its point of entry to final destinations, to prevent inappropriate generation of damaging reactive oxygen species. Accordingly, regulatory mechanisms have been developed to maintain appropriate cellular and body iron levels. In intracellular compartments, about 95% of iron is protein-bound and the expression of the major proteins of iron metabolism is controlled by an integrated and dynamic system involving multilayered levels of regulation...
May 7, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28458022/impaired-prefrontal-cognitive-control-over-interference-by-food-images-in-binge-eating-disorder-and-bulimia-nervosa
#13
Jung Eun Lee, Kee Namkoong, Young-Chul Jung
Binge-eating disorder (BED)characterized by recurrent episodes of binge-eating without inappropriate compensatory behaviors is classified as an official diagnosis in DSM-5. However, the neural bases that differentiate BED from other eating disorders such as bulimia nervosa (BN), are still under debate. Thirty-nine participants (HC, n=14; BN, n=13; BED, n=12) underwent functional MRI while performing a Stroop-Match-to-Sample task. This pilot study investigated how food images interfered with the behavioral performances and blood-oxygenation-level-dependent neuronal activity...
April 27, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28427745/how-to-approach-the-acute-respiratory-distress-syndrome-prevention-plan-and-prudence
#14
REVIEW
Younsuck Koh
The acute respiratory distress syndrome (ARDS) is typically manifested by refractory hypoxemia with high mortality. A correct diagnosis is the first step to achieve better outcomes. An early intervention to manage modifiable risk factors of ARDS development and the avoidance of aggravating factors that increase disease severity and progression should be carefully addressed. A management plan is necessary at an early stage of ARDS to determine the level of intensive care. It should be carefully decided which therapeutic measures should be performed depending on the patient׳s underlying clinical condition...
May 2017: Respiratory Investigation
https://www.readbyqxmd.com/read/28420950/metallothionein-copper-and-alpha-synuclein-in-alpha-synucleinopathies
#15
REVIEW
Yuho Okita, Alexandre N Rcom-H'cheo-Gauthier, Michael Goulding, Roger S Chung, Peter Faller, Dean L Pountney
Metallothioneins (MTs) are proteins that function by metal exchange to regulate the bioavailability of metals, such as zinc and copper. Copper functions in the brain to regulate mitochondria, neurotransmitter production, and cell signaling. Inappropriate copper binding can result in loss of protein function and Cu(I)/(II) redox cycling can generate reactive oxygen species. Copper accumulates in the brain with aging and has been shown to bind alpha-synuclein and initiate its aggregation, the primary aetiological factor in Parkinson's disease (PD), and other alpha-synucleinopathies...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28416613/hypoxia-inducible-factor-1%C3%AE-activates-insulin-induced-gene-2-insig-2-transcription-for-degradation-of-3-hydroxy-3-methylglutaryl-hmg-coa-reductase-in-the-liver
#16
Seonghwan Hwang, Andrew D Nguyen, Youngah Jo, Luke J Engelking, James Brugarolas, Russell A DeBose-Boyd
Cholesterol synthesis is a highly oxygen-consuming process. As such, oxygen deprivation (hypoxia) limits cholesterol synthesis through incompletely understood mechanisms mediated by the oxygen-sensitive transcription factor hypoxia-inducible factor 1α (HIF-1α). We show here that HIF-1α links pathways for oxygen sensing and feedback control of cholesterol synthesis in human fibroblasts by directly activating transcription of the INSIG-2 gene. Insig-2 is one of two endoplasmic reticulum membrane proteins that inhibit cholesterol synthesis by mediating sterol-induced ubiquitination and subsequent endoplasmic reticulum-associated degradation of the rate-limiting enzyme in the pathway, HMG-CoA reductase (HMGCR)...
June 2, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28402299/influences-of-rainfall-variables-and-antecedent-discharge-on-urban-effluent-concentrations-and-loads-in-wet-weather
#17
Zuxin Xu, Lijun Xiong, Huaizheng Li, Zhengliang Liao, Hailong Yin, Jun Wu, Jin Xu, Hao Chen
For storm drainages inappropriately connected with sewage, wet weather discharge is a major factor that adversely affects receiving waters. A study of the wet weather influences of rainfall-discharge variables on storm drainages connected with sewage was conducted in the downtown Shanghai area (374 ha). Two indicators, event mean concentration (EMC) and event pollutant load per unit area (EPL), were used to describe the pollution discharge during 20 rain events. The study showed that the total rainfall and discharge volume were important factors that affect the EMCs and EPLs of the chemical oxygen demand, total phosphorus, and especially those of NH4(+)-N...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28384851/effect-of-antioxidants-%C3%AE-mercaptoethanol-and-cysteamine-on-assisted-reproductive-technology-in-vitro
#18
Mohsen Nikseresht, Mehdi Akbartabar Toori, Hamid Reza Rahimi, Ali Reza Fallahzadeh, Iraj Ragerdi Kahshani, Seyedeh Fatemeh Hashemi, Solmaz Bahrami, Reza Mahmoudi
INTRODUCTION: Oocyte Culture of Germinal Vesicle (GV) and its growth improves Assisted Reproductive Technology (ART) invitro and infertility. Inappropriate culture medium environment, low quality of oocytes, increase in Oxidative Stress (OS) events, Reactive Oxygen Species (ROS) and free radicals production are the main factors that result in unsuccessful Invitro Maturation (IVM) and decrease in reproduction. AIM: The present study was conducted with the aim to evaluate the effect of β-mercaptoethanol (BME) and Cysteamine (CYS) on IVM improvement, embryo fertilization and development of blastocyst of mouse immature oocyte...
February 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28357824/identifying-and-acting-on-inappropriate-metadata-a-critique-of-the-grattan-institute-report-on-questionable-care-in-australian-hospitals
#19
P David Cooper, David R Smart
INTRODUCTION: In an era of ever-increasing medical costs, the identification and prohibition of ineffective medical therapies is of considerable economic interest to healthcare funding bodies. Likewise, the avoidance of interventions with an unduly elevated clinical risk/benefit ratio would be similarly advantageous for patients. Regrettably, the identification of such therapies has proven problematic. A recent paper from the Grattan Institute in Australia (identifying five hospital procedures as having the potential for disinvestment on these grounds) serves as a timely illustration of the difficulties inherent in non-clinicians attempting to accurately recognize such interventions using non-clinical, indirect or poorly validated datasets...
March 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28292466/generation-of-trophoblast-like-cells-from-the-amnion-in%C3%A2-vitro-a-novel-cellular-model-for-trophoblast-development
#20
Yanxing Wei, Xiaohua Zhou, Wenhao Huang, Ping Long, Lu Xiao, Tian Zhang, Mei Zhong, Guangjin Pan, Yanlin Ma, Yanhong Yu
Despite the high incidence of trophoblast-related diseases, the molecular mechanism of inadequate early trophoblast development is still unclear due to the lack of an appropriate cellular model in vitro. In the present study, we reprogrammed the amniotic cells to be induced pluripotent stem cells (iPSCs) via a non-virus and non-integrated method and subsequently differentiated them into trophoblast-like cells by a modified BMP4 strategy in E6 medium. Compared with the previously studied trophoblast-like cells from ESCs, the iPSCs derived trophoblast-like cells behave similarly in terms of gene expression profiles and biofunctions...
March 2017: Placenta
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