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https://www.readbyqxmd.com/read/28093705/manipulation-of-oxygen-and-endoplasmic-reticulum-stress-factors-as-possible-interventions-for-treatment-of-multiple-sclerosis-evidence-for-and-against
#1
Paul Eggleton, Gary R Smerdon, Janet E Holley, Nicholas J Gutowski
Multiple sclerosis (MS) is normally considered a chronic inflammatory disease of the central nervous system (CNS), where T-cells breaching the blood brain barrier react against proteins of the axonal myelin sheaths, leading to focal plaques and demyelination in the brain and spinal cord. Many current therapies are immunosuppressive in nature and are designed to target the immune system at an early stage of the disease. But there is no cure and MS may evolve into a neurodegenerative disease, where immunomodulatory treatments appear less effective...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28088487/adenosine-receptors-and-caffeine-in-retinopathy-of-prematurity
#2
REVIEW
Jiang-Fan Chen, Shuya Zhang, Rong Zhou, Zhenlang Lin, Xiaohong Cai, Jing Lin, Yuqin Huo, Xiaoling Liu
Retinopathy of prematurity (ROP) is a major cause of childhood blindness in the world and is caused by oxygen-induced damage to the developing retinal vasculature, resulting in hyperoxia-induced vaso-obliteration and subsequent delayed retinal vascularization and hypoxia-induced pathological neovascularization driven by vascular endothelial growth factor (VEGF) signaling pathway in retina. Current anti-VEGF therapy has shown some effective in a clinical trial, but is associated with the unintended effects on delayed eye growth and retinal vasculature development of preterm infants...
January 11, 2017: Molecular Aspects of Medicine
https://www.readbyqxmd.com/read/28068681/hypoxia-and-hyperoxia-affect-serum-angiogenic-regulators-in-t2dm-men-during-cycling
#3
C Brinkmann, A Metten, P Scriba, C V M Tagarakis, P Wahl, J Latsch, K Brixius, W Bloch
Exercise-induced transient increases in pro-angiogenic regulators can promote angiogenesis.This pilot study aims to analyze the potential of exercise to positively affect angiogenic regulators in patients with type 2 diabetes mellitus (T2DM), who often exhibit abnormal angiogenesis, under different environmental conditions. 9 overweight/obese men with uncomplicated T2DM (8 took anti-diabetic drugs) performed submaximal cycling for 40 min in normoxia (≈21 vol%O2), hypoxia (≈14 vol%O2) and during alternating hypoxia/hyperoxia (≈14 vol%O2/≈30 vol%O2, 5-min intervals) (3×3 crossover design)...
January 9, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28068656/mechanisms-of-improved-exercise-performance-under-hyperoxia
#4
Silvia Ulrich, Elisabeth D Hasler, Séverine Müller-Mottet, Stephan Keusch, Michael Furian, Tsogyal D Latshang, Simon Schneider, Stéphanie Saxer, Konrad E Bloch
BACKGROUND: The impact of hyperoxia on exercise limitation is still incompletely understood. OBJECTIVES: We investigated to which extent breathing hyperoxia enhances the exercise performance of healthy subjects and which physiologic mechanisms are involved. METHODS: A total of 32 healthy volunteers (43 ± 15 years, 12 women) performed 4 bicycle exercise tests to exhaustion with ramp and constant-load protocols (at 75% of the maximal workload [Wmax] on FiO2 0...
January 10, 2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/28067624/modelling-bronchopulmonary-dysplasia-in-mice-how-much-oxygen-is-enough
#5
Claudio Nardiello, Ivana Mižíková, Diogo M Silva, Jordi Ruiz-Camp, Konstantin Mayer, István Vadász, Susanne Herold, Werner Seeger, Rory E Morty
Progress in developing new therapies for bronchopulmonary dysplasia (BPD) is sometimes complicated by the lack of a standardised animal model. Our objective was to develop a robust hyperoxia‑based mouse model of BPD that recapitulated the pathological perturbations to lung structure noted in infants with BPD. Newborn mouse pups were exposed to a varying fraction of oxygen in the inspired air (FiO2) and a varying window of hyperoxia exposure, after which lung structure was assessed by design‑based stereology with systemic uniform random sampling...
December 14, 2016: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/28057577/heterogeneity-of-blood-flow-and-metabolism-during-exercise-in-patients-with-chronic-obstructive-pulmonary-disease
#6
Zafeiris Louvaris, Helmut Habazettl, Andreas Asimakos, Harrieth Wagner, Spyros Zakynthinos, Peter D Wagner, Ioannis Vogiatzis
The study investigated whether the capacity to regulate muscle blood flow (Q) relative to metabolic demand (VO2) is impaired in COPD. Using six NIRS optodes over the upper, middle and lower vastus lateralis in 6 patients, (FEV1:46±12%predicted) we recorded from each: a) Q by indocyanine green dye injection, b) VO2/Q ratios based on fractional tissue O2 saturation and c) VO2 as their product, during constant-load exercise (at 20%, 50% and 80% of peak capacity) in normoxia and hyperoxia (FIO2:1.0). At 50 and 80%, relative dispersion (RD) for Q, but not for VO2, was greater in normoxia (0...
January 3, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28057450/antiepileptic-drugs-prevent-seizures-in-hyperbaric-oxygen-a-novel-model-of-epileptiform-activity
#7
Ivan T Demchenko, Sergei Yu Zhilyaev, Alexander N Moskvin, Alexander I Krivchenko, Claude A Piantadosi, Barry W Allen
Breathing oxygen at sufficiently elevated pressures can trigger epileptiform seizures. Therefore, we tested the hypothesis that pre-treatment with FDA-approved antiepileptic drugs could prevent seizure onset in hyperoxia at 5 atmospheres absolute. We selected drugs from two putative functional categories, Na(+)-channel antagonists and GABA enhancers, each administered intraperitoneally at four doses in separate groups of C57BL/6 mice. The drugs varied in efficacy at the doses used. Of the five tested Na(+)-channel antagonists, carbamazepine and lamotrigine more than tripled seizure latency compared to values seen in vehicle controls...
January 2, 2017: Brain Research
https://www.readbyqxmd.com/read/28045936/detoxification-of-mitochondrial-oxidants-and-apoptotic-signaling-are-facilitated-by-thioredoxin-2-and-peroxiredoxin-3-during-hyperoxic-injury
#8
Benjamin J Forred, Darwin R Daugaard, Brianna K Titus, Ryan R Wood, Miranda J Floen, Michelle L Booze, Peter F Vitiello
Mitochondria play a fundamental role in the regulation of cell death during accumulation of oxidants. High concentrations of atmospheric oxygen (hyperoxia), used clinically to treat tissue hypoxia in premature newborns, is known to elicit oxidative stress and mitochondrial injury to pulmonary epithelial cells. A consequence of oxidative stress in mitochondria is the accumulation of peroxides which are detoxified by the dedicated mitochondrial thioredoxin system. This system is comprised of the oxidoreductase activities of peroxiredoxin-3 (Prx3), thioredoxin-2 (Trx2), and thioredoxin reductase-2 (TrxR2)...
2017: PloS One
https://www.readbyqxmd.com/read/28039082/intraoperative-cerebral-oxygenation-oxidative-injury-and-delirium-following-cardiac-surgery
#9
Marcos G Lopez, Pratik Pandharipande, Jennifer Morse, Matthew S Shotwell, Ginger L Milne, Mias Pretorius, Andrew D Shaw, L Jackson Roberts, Frederic T Billings
BACKGROUND: Delirium affects 20-30% of patients after cardiac surgery and is associated with increased mortality and persistent cognitive decline. Hyperoxic reperfusion of ischemic tissues increases oxidative injury, but oxygen administration remains high during cardiac surgery. We tested the hypothesis that intraoperative hyperoxic cerebral reperfusion is associated with increased postoperative delirium and that oxidative injury mediates this association. METHODS: We prospectively measured cerebral oxygenation with bilateral oximetry monitors in 310 cardiac surgery patients, quantified intraoperative hyperoxic cerebral reperfusion by measuring the magnitude of cerebral oxygenation above baseline after any ischemic event, and assessed patients for delirium twice daily in the ICU following surgery using the confusion assessment method for ICU (CAM-ICU)...
December 27, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28034711/ventilatory-and-chemoreceptor-responses-to-hypercapnia-in-neonatal-rats-chronically-exposed-to-moderate-hyperoxia
#10
Ryan W Bavis, Ke-Yong Li, Kathryn J DeAngelis, Ryan J March, Josefine A Wallace, Sarah Logan, Robert W Putnam
Rats reared in hyperoxia hypoventilate in normoxia and exhibit progressive blunting of the hypoxic ventilatory response, changes which are at least partially attributed to abnormal carotid body development. Since the carotid body also responds to changes in arterial CO2/pH, we tested the hypothesis that developmental hyperoxia would attenuate the hypercapnic ventilatory response (HCVR) of neonatal rats by blunting peripheral and/or central chemoreceptor responses to hypercapnic challenges. Rats were reared in 21% O2 (Control) or 60% O2 (Hyperoxia) until studied at 4, 6-7, or 13-14days of age...
December 26, 2016: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28018521/the-effects-of-the-combination-of-a-refined-carbohydrate-diet-and-exposure-to-hyperoxia-in-mice
#11
Nicia Pedreira Soares, Keila Karine Duarte Campos, Karina Braga Pena, Ana Carla Balthar Bandeira, André Talvani, Marcelo Eustáquio Silva, Frank Silva Bezerra
Obesity is a multifactorial disease with genetic, social, and environmental influences. This study aims at analyzing the effects of the combination of a refined carbohydrate diet and exposure to hyperoxia on the pulmonary oxidative and inflammatory response in mice. Twenty-four mice were divided into four groups: control group (CG), hyperoxia group (HG), refined carbohydrate diet group (RCDG), and refined carbohydrate diet + hyperoxia group (RCDHG). The experimental diet was composed of 10% sugar, 45% standard diet, and 45% sweet condensed milk...
2016: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28013306/inhibition-of-rac1-signaling-downregulates-inflammasome-activation-and-attenuates-lung-injury-in-neonatal-rats-exposed-to-hyperoxia
#12
Julia K Hummler, Fredrick Dapaah-Siakwan, Ruben Vaidya, Ronald Zambrano, Siwei Luo, Shaoyi Chen, Nadine Kerr, Juan Pablo de Rivero Vaccari, Robert W Keane, W Dalton Dietrich, Eduardo Bancalari, Karen C Young, Shu Wu
BACKGROUND: Inflammatory injury, particularly the production of active interleukin (IL)-1β plays a major role in the pathogenesis of bronchopulmonary dysplasia (BPD) in preterm infants. The release of active IL-1β is controlled by posttranscriptional modifications of its proform (pro-IL-1β) through the inflammasome. Rac1 is a member of the Rho family of GTPases that regulate the inflammatory process. OBJECTIVE: This study tested the hypothesis that Rac1 signaling increases inflammasome activation that results in damaging inflammation, and that the inhibition of Rac1 signaling prevents lung injury, by inhibiting inflammasome activation in a newborn rat model of BPD induced by hyperoxia...
December 24, 2016: Neonatology
https://www.readbyqxmd.com/read/28002632/hypoxia-and-hyperoxia-differentially-control-proliferation-of-rat-neural-crest-stem-cells-via-distinct-regulatory-pathways-of-the-hif1%C3%AE-cxcr4-and-tp53-tpm1-proteins
#13
Chien-Cheng Chen, Ching-Wu Hsia, Cheng-Wen Ho, Chang-Min Liang, Chieh-Min Chen, Kun-Lun Huang, Bor-Hwang Kang, Yi-Hui Chen
BACKGROUND: Neural crest stem cells (NCSCs) are a population of adult multipotent stem cells. We are interested in studying whether oxygen tensions affect the capability of NCSCs to self-renew and repair damaged tissues. NCSCs extracted from the hair follicle bulge region of the rat whisker pad were cultured in vitro under different oxygen tensions. RESULTS: We found significantly increased and decreased rates of cell proliferation in rat NCSCs (rNCSCs) cultured respectively at 0...
December 21, 2016: Developmental Dynamics: An Official Publication of the American Association of Anatomists
https://www.readbyqxmd.com/read/27994554/effect-of-environmental-and-feedback-interventions-on-pacing-profiles-in-cycling-a-meta-analysis
#14
REVIEW
Michael J Davies, Bradley Clark, Marijke Welvaert, Sabrina Skorski, Laura A Garvican-Lewis, Philo Saunders, Kevin G Thompson
In search of their optimal performance athletes will alter their pacing strategy according to intrinsic and extrinsic physiological, psychological and environmental factors. However, the effect of some of these variables on pacing and exercise performance remains somewhat unclear. Therefore, the aim of this meta-analysis was to provide an overview as to how manipulation of different extrinsic factors affects pacing strategy and exercise performance. Only self-paced exercise studies that provided control and intervention group(s), reported trial variance for power output, disclosed the type of feedback received or withheld, and where time-trial power output data could be segmented into start, middle and end sections; were included in the meta-analysis...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27993546/post-resuscitation-management-of-cardiac-arrest-patients-in-the-critical-care-environment-a-retrospective-audit-of-compliance-with-evidence-based-guidelines
#15
REVIEW
A Milonas, A Hutchinson, D Charlesworth, A Doric, J Green, J Considine
BACKGROUND: There is a clear relationship between evidence-based post resuscitation care and survival and functional status at hospital discharge. The Australian Resuscitation Council (ARC) recommends protocol driven care to enhance chance of survival following cardiac arrest. Healthcare providers have an obligation to ensure protocol driven post resuscitation care is timely and evidence based. OBJECTIVES: The aim of this study was to examine adherence to best practice guidelines for post resuscitation care in the first 24h from Return of Spontaneous Circulation for patients admitted to the intensive care unit from the emergency department having suffered out of hospital or emergency department cardiac arrest and survived initial resuscitation...
December 16, 2016: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/27990359/effect-of-endothelial-progenitor-cells-derived-from-human-umbilical-cord-blood-on-oxygen-induced-retinopathy-in-mice-by-intravitreal-transplantation
#16
Dan Wang, Bo Zhang, Hui Shi, Wei Yang, Ming-Chao Bi, Xiang-Fu Song, Chen Zhang, Jian-Hui Cheng, Ji-Long Hao, E Song
AIM: To investigate the effect of endothelial progenitor cells (EPCs) labeled by carboxy fluorescein diacetate succinimidyl ester (CFSE) on murine oxygen-induced retinopathy (OIR) by intravitreal transplantation. METHODS: After isolated from human umbilical cord blood mononuclear cells, EPCs were cultivated and then labeled with CFSE in vitro. C57BL/6J mice were placed to 75% hyperoxia chamber from P7 to P12 to establish OIR model. At P12, OIR mice were intravitreally injected with 1 µL suspension contained 2×10(5) EPCs (EPCs group) or isometric phosphate buffered saline (PBS group)...
2016: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/27986613/oxygen-flux-reduces-cux1-positive-neurons-and-cortical-growth-in-a-gestational-rodent-model-of-growth-restriction
#17
Elaine Fletcher, Jean Wade, Petrina A Georgala, Trudi L Gillespie, David J Price, Elizabeth Pilley, Julie-Clare Becher
BACKGROUND: The mammalian cerebral cortex forms in an inside-out manner, establishing deep cortical layers before superficial layers and is regulated by transcription factors which influence cell differentiation. Preterm birth interrupts the trajectory of normal neurodevelopment and adverse perinatal exposures have been implicated in cortical injury. We hypothesise that growth restriction (GR) and fluctuating hyperoxia (ΔO2) impair cortical laminar development. METHODS: Sprague-Dawley rats received 18% (non-restricted, NR) or 9% (growth restricted, GR) protein diet from E15-P7...
December 13, 2016: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/27967234/alternative-progenitor-lineages-regenerate-the-adult-lung-depleted-of-type-ii-cells
#18
Min Yee, William Domm, Robert Gelein, Karen L de Mesy Bentley, R Matthew Kottmann, Patricia J Sime, B Paige Lawrence, Michael A O'Reilly
An aberrant oxygen environment at birth increases the severity of respiratory viral infections later in life through poorly understood mechanisms. Here we show that alveolar epithelial type II (AEC2) cells, a progenitor for AEC1 cells are depleted in adult mice exposed to neonatal hypoxia or hyperoxia. Airway cells expressing SP-C and ABCA3, alveolar pod cells expressing KRT5, and pulmonary fibrosis was observed when these mice were infected with a sublethal dose of HKx31, H3N2 influenza A virus (IAV). This was not seen in infected siblings birthed into room air...
December 14, 2016: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/27958774/early-stage-hyperoxia-is-associated-with-favorable-neurological-outcomes-and-survival-following-severe-traumatic-brain-injury-a-post-hoc-analysis-of-the-b-hypo-study
#19
Motoki Fujita, Yasutaka Oda, Susumu Yamashita, Kotaro Kaneda, Tadashi Kaneko, Eiichi Suehiro, Kenji Dohi, Yasuhiro Kuroda, Hitoshi Kobata, Ryosuke Tsuruta, Tsuyoshi Maekawa
The effects of hyperoxia on the neurological outcomes of patients with severe traumatic brain injury (TBI) are still controversial. We examined whether the partial pressure of arterial oxygen (PaO2) and hyperoxia are associated with neurological outcomes and survival by conducting post hoc analyses of the Brain Hypothermia (B-HYPO) study, a multicenter randomized controlled trial of mild therapeutic hypothermia for severe TBI. The differences in PaO2 and PaO2/fraction of inspiratory oxygen (P/F) ratio on the first day of admission were compared between patients with favorable (n = 64) and unfavorable neurological outcomes (n = 65) and between survivors (n = 90) and deceased patients (n = 39)...
December 13, 2016: Journal of Neurotrauma
https://www.readbyqxmd.com/read/27957795/refining-anti-inflammatory-therapy-strategies-for-bronchopulmonary-dysplasia
#20
Ina Rudloff, Steven X Cho, Christine B Bui, Catriona McLean, Alex Veldman, Philip J Berger, Marcel F Nold, Claudia A Nold-Petry
Bronchopulmonary dysplasia (BPD) is a severe lung disease of preterm infants, which is characterized by fewer, enlarged alveoli and increased inflammation. BPD has grave consequences for affected infants, but no effective and safe therapy exists. We previously showed that prophylactic treatment with interleukin-1 receptor antagonist (IL-1Ra) prevents murine BPD induced by perinatal inflammation and hyperoxia. Here, we used the same BPD model to assess whether an alternative anti-inflammatory agent, protein C (PC), is as effective as IL-1Ra against BPD...
December 13, 2016: Journal of Cellular and Molecular Medicine
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