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Hyperoxia recognition

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https://www.readbyqxmd.com/read/27183577/hyperoxic-exposure-of-immature-mice-increases-the-inflammatory-response-to-subsequent-rhinovirus-infection-association-with-danger-signals
#1
Tracy X Cui, Bhargavi Maheshwer, Jun Y Hong, Adam M Goldsmith, J Kelley Bentley, Antonia P Popova
Infants with a history of prematurity and bronchopulmonary dysplasia have a high risk of asthma and viral-induced exacerbations later in life. We hypothesized that hyperoxic exposure, a predisposing factor to bronchopulmonary dysplasia, modulates the innate immune response, producing an exaggerated proinflammatory reaction to viral infection. Two- to 3-d-old C57BL/6J mice were exposed to air or 75% oxygen for 14 d. Mice were infected intranasally with rhinovirus (RV) immediately after O2 exposure. Lung mRNA and protein expression, histology, dendritic cells (DCs), and airway responsiveness were assessed 1-12 d postinfection...
June 1, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/24730726/hyperbaric-oxygen-vasculogenic-stem-cells-and-wound-healing
#2
REVIEW
Katina M Fosen, Stephen R Thom
SIGNIFICANCE: Oxidative stress is recognized as playing a role in stem cell mobilization from peripheral sites and also cell function. RECENT ADVANCES: This review focuses on the impact of hyperoxia on vasculogenic stem cells and elements of wound healing. CRITICAL ISSUES: Components of the wound-healing process in which oxidative stress has a positive impact on the various cells involved in wound healing are highlighted. A slightly different view of wound-healing physiology is adopted by departing from the often used notion of sequential stages: hemostatic, inflammatory, proliferative, and remodeling and instead organizes the cascade of wound healing as overlapping events or waves pertaining to reactive oxygen species, lactate, and nitric oxide...
October 10, 2014: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/23769703/measurement-of-oef-and-absolute-cmro2-mri-based-methods-using-interleaved-and-combined-hypercapnia-and-hyperoxia
#3
Richard G Wise, Ashley D Harris, Alan J Stone, Kevin Murphy
Blood oxygenation level dependent (BOLD) functional magnetic resonance imaging (fMRI) is most commonly used in a semi-quantitative manner to infer changes in brain activity. Despite the basis of the image contrast lying in the cerebral venous blood oxygenation level, quantification of absolute cerebral metabolic rate of oxygen consumption (CMRO2) has only recently been demonstrated. Here we examine two approaches to the calibration of fMRI signal to measure absolute CMRO2 using hypercapnic and hyperoxic respiratory challenges...
December 2013: NeuroImage
https://www.readbyqxmd.com/read/23446060/oligodendroglial-alterations-and-the-role-of-microglia-in-white-matter-injury-relevance-to-schizophrenia
#4
Li-Jin Chew, Paolo Fusar-Poli, Thomas Schmitz
Schizophrenia is a chronic and debilitating mental illness characterized by a broad range of abnormal behaviors, including delusions and hallucinations, impaired cognitive function, as well as mood disturbances and social withdrawal. Due to the heterogeneous nature of the disease, the causes of schizophrenia are very complex; its etiology is believed to involve multiple brain regions and the connections between them, and includes alterations in both gray and white matter regions. The onset of symptoms varies with age and severity, and there is some debate over a degenerative or developmental etiology...
2013: Developmental Neuroscience
https://www.readbyqxmd.com/read/23064437/neurodevelopmental-impairment-following-neonatal-hyperoxia-in-the-mouse
#5
Manimaran Ramani, Thomas van Groen, Inga Kadish, Arlene Bulger, Namasivayam Ambalavanan
Extremely premature infants are often exposed to supra-physiologic concentrations of oxygen, and frequently have hypoxemic episodes. These preterm infants are at high risk (~40%) for neurodevelopmental impairment (NDI) even in the absence of obvious intracranial pathology such as intraventricular hemorrhage or periventricular leukomalacia. The etiology for NDI has not been determined, and there are no animal models to simulate neurodevelopmental outcomes of prematurity. Our objectives were to develop and characterize a mouse model to determine long-term effects of chronic hypoxia or hyperoxia exposure on neurodevelopment...
February 2013: Neurobiology of Disease
https://www.readbyqxmd.com/read/20013179/the-generation-of-stable-oxidative-stress-resistant-phenotypes-in-chinese-hamster-fibroblasts-chronically-exposed-to-hydrogen-peroxide-or-hyperoxia
#6
Douglas R Spitz, Shannon J Sullivan
With the recognition that chronic exposure to oxidative stress occurs in many disease states and can be deleterious to the human health, great interest has emerged in understanding the mechanisms by which mammalian cells develop resistance to chronic oxidative stress. In order to study the mechanisms of development of resistance to chronic oxidative stress, a model system where Chinese hamster fibroblasts (HA1) are chronically exposed to progressively increasing concentrations of H(2)O(2) (50-800 muM) or hyperoxia (80-95% O(2)) has been developed...
2010: Methods in Molecular Biology
https://www.readbyqxmd.com/read/17122132/rgc-sensitivity-to-mild-systemic-hypoxia
#7
Hélène Kergoat, Marie-Eve Hérard, Marianne Lemay
PURPOSE: Systemic hyperoxia, hypercapnia, and hypoxia are known to alter retinal perfusion. The effects such experimentally induced systemic blood gas perturbations have on inner neuroretinal function in humans were examined. METHODS: Twenty healthy adults participated in each of three test sessions. The effects of breathing pure oxygen (O2), carbogen, or a hypoxic gas on the pattern electroretinogram (pERG) were investigated. The stimulus consisted of high-contrast, black-and-white, 48-min arc checks reversing at 1 Hz...
December 2006: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/16585591/inducible-activation-of-tlr4-confers-resistance-to-hyperoxia-induced-pulmonary-apoptosis
#8
Salman T Qureshi, Xuchen Zhang, Erika Aberg, Nicolas Bousette, Adel Giaid, Peiying Shan, Ruslan M Medzhitov, Patty J Lee
TLRs are essential mediators of host defense against infection via recognition of unique microbial structures. Recent observations indicate that TLR4, the principal receptor for bacterial LPS, may also be activated by noninfectious stimuli including host-derived molecules and environmental oxidant stress. In mice, susceptibility to ozone-induced lung permeability has been linked to the wild-type allele of TLR4, whereas deficiency of TLR4 predisposes to lethal lung injury in hyperoxia. To precisely characterize the role of lung epithelial TLR4 expression in the host response to oxidant stress, we have created an inducible transgenic mouse model that targets the human TLR4 signaling domain to the airways...
April 15, 2006: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/16516625/cerebral-oxygenation-in-major-pediatric-trauma-its-relevance-to-trauma-severity-and-outcome
#9
Pradeep K Narotam, Sathyaprasad C Burjonrappa, Stephen C Raynor, Malini Rao, Charles Taylon
INTRODUCTION: Trauma is the commonest cause of death in the pediatric population, which is prone to diffuse primary brain injury aggravated by secondary insults (eg, hypoxia, hypotension). Standard monitoring involves intracranial pressure (ICP) and cerebral perfusion pressure, which do not reflect true cerebral oxygenation (oxygen delivery [Do(2)]). We explore the merits of a brain tissue oxygen-directed critical care guide. METHODS: Sixteen patients with major trauma (Injury Severity Score, >16/Pediatric Trauma Score [PTS], <7) had partial pressure of brain tissue oxygen (Pbto(2)) monitor (Licox; Integra Neurosciences, Plainsboro, NJ) placed under local anesthesia using twist-drill craniostomy and definitive management of associated injuries...
March 2006: Journal of Pediatric Surgery
https://www.readbyqxmd.com/read/15589104/caffeine-alters-the-temporal-dynamics-of-the-visual-bold-response
#10
Thomas T Liu, Yashar Behzadi, Khaled Restom, Kamil Uludag, Kun Lu, Giedrius T Buracas, David J Dubowitz, Richard B Buxton
The blood oxygenation level-dependent (BOLD) responses to visual stimuli, using both a 1-s long single trial stimulus and a 20-s long block stimulus, were measured in a 4-T magnetic field both before and immediately after a 200-mg caffeine dose. In addition, resting levels of cerebral blood flow (CBF) were measured using arterial spin labeling. For the single trial stimulus, the caffeine dose significantly (p<0.05) reduced the time to peak (TTP), the time after the peak at which the response returned to 50% of the peak amplitude (TA50), and the amplitude of the poststimulus undershoot in all subjects (N=5)...
December 2004: NeuroImage
https://www.readbyqxmd.com/read/15082070/localization-of-isoketal-adducts-in-vivo-using-a-single-chain-antibody
#11
Sean S Davies, Megha Talati, Xiahong Wang, Raymond L Mernaugh, Venkataraman Amarnath, Joshua Fessel, Barbara O Meyrick, James Sheller, L Jackson Roberts
Isoketals are highly reactive gamma-ketoaldehydes formed by the oxidation of arachidonic acid that rapidly adduct to proteins. To investigate the formation of isoketal adducts in vivo, we isolated and characterized a single-chain antibody from a phage displayed recombinant ScFv library that bound a model peptide adducted with synthetic 15-E2-isoketal. Recognition of isoketal adduct by this anti-isoketal adduct single-chain antibody was essentially independent of the amino acid sequence of adducted peptides or proteins...
May 1, 2004: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/14961188/oxygen-in-wound-healing-more-than-a-nutrient
#12
REVIEW
Andrea A Tandara, Thomas A Mustoe
This article provides an overview of the role of oxygen in wound healing. The understanding of this role has undergone a major evolution from its long-recognized importance as an essential factor for oxidative metabolism, to its recognition as an important cell signal interacting with growth factors and other signals to regulate signal transduction pathways. Our laboratory has been engaged in the study of animal models of skin ischemia to explore in vivo the impact of hypoxia as well as the use of oxygen as a therapeutic agent either alone or in combination with other agents such as growth factors...
March 2004: World Journal of Surgery
https://www.readbyqxmd.com/read/10333449/hyperbaric-oxygen-in-the-treatment-of-life-threatening-soft-tissue-infections
#13
REVIEW
L A Clark, R E Moon
Necrotizing soft-tissue infections are rapidly spreading bacterial infections that account for a relatively small proportion of infections, but are aggressive in nature and nearly uniformly fatal if left untreated. Prompt recognition, antibiotic therapy, aggressive surgical debridement, and hyperbaric oxygen (HBO) therapy have reduced the mortality resulting from these infections. Oxygen, at increased pressures, augments tissue oxygen partial pressure, allowing increased bacterial killing by providing substrate for the formation of oxygen free radicals and augmenting respiratory burst...
June 1999: Respiratory Care Clinics of North America
https://www.readbyqxmd.com/read/3905287/pulmonary-oxygen-toxicity
#14
REVIEW
R M Jackson
Although oxygen therapy has been used in the care of critically ill patients for many years, the recognition of pulmonary oxygen toxicity as an important clinical problem is relatively recent. The biochemical basis of oxygen toxicity is increased production of highly reactive, partially reduced metabolites of oxygen, including hydrogen peroxide and free radicals, by cells in hyperoxia. Enzymatic intracellular defense mechanisms exist which protect cells from the toxic effects of oxygen free radicals. The physiologic manifestations of oxygen toxicity include decreases in vital capacity, diffusing capacity, and lung compliance...
December 1985: Chest
https://www.readbyqxmd.com/read/2507512/responses-of-type-ii-pneumocyte-antioxidant-enzymes-to-normoxic-and-hyperoxic-culture
#15
P C Panus, S Matalon, B A Freeman
Cultured type II pneumocyte responses to in vitro normoxia (95% air:5% CO2) or hyperoxia (95% O2:5% CO2) were quantified. Normoxic culture (0 to 96 h) of rabbit type II cells resulted in enhanced cell-monolayer protein and DNA content. During this same time, cellular activities of superoxide dismutase (SOD), catalase, and glutathione peroxidase (GSH Px) decreased. Compared to cultures maintained in normoxia, hyperoxic exposure of cultures resulted in decreased cell-associated protein and DNA content. Exposure to hyperoxia also resulted in cytotoxicity as demonstrated by elevated cellular release of DNA, lactate dehydrogenase (LDH), and preincorporated 8-[14 C]adenine...
September 1989: In Vitro Cellular & Developmental Biology: Journal of the Tissue Culture Association
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