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https://www.readbyqxmd.com/read/28546947/carotenoids-from-microalgae-to-block-oxidative-stress
#1
EDITORIAL
Marisol Zuluaga, Virginie Gueguen, Graciela Pavon-Djavid, Didier Letourneur
Reactive oxygen species (ROS) are produced under normal physiological conditions and involved in several cellular biochemical processes. Their external or endogenous overproduction induces a disruption of redox signaling and control known as oxidative stress. Under oxidative stress, the cell membrane structures, enzyme functions and gene expression are compromised leading to the pathogenesis of several chronic inflammatory diseases including the cardiovascular pathologies. Attempts to find new therapeutic molecules capable of blocking the oxidative stress are of crucial importance...
2017: BioImpacts: BI
https://www.readbyqxmd.com/read/28546370/pediatric-oxygen-therapy-a-review-and-update
#2
Brian K Walsh, Craig D Smallwood
Oxygen is a colorless, odorless, tasteless gas that is utilized by the body for respiration. Oxygen has played a major role in respiratory care. Oxygen therapy is useful in treating hypoxemia but is often thought of as a benign therapy. After many years of study, we have learned a great deal of the benefits and potential risk of this powerful drug. Today oxygen gas is cheap, widely available, and easy to administer. Oxygen delivery devices vary in cost from a few cents for a simple nasal cannula to $25-$50 for some humidified systems...
June 2017: Respiratory Care
https://www.readbyqxmd.com/read/28544324/albumin-templated-manganese-dioxide-nanoparticles-for-enhanced-radioisotope-therapy
#3
Longlong Tian, Qian Chen, Xuan Yi, Jiawen Chen, Chao Liang, Yu Chao, Kai Yang, Zhuang Liu
Although nanoparticle-based drug delivery systems have been widely explored for tumor-targeted delivery of radioisotope therapy (RIT), the hypoxia zones of tumors on one hand can hardly be reached by nanoparticles with relatively large sizes due to their limited intratumoral diffusion ability, on the other hand often exhibit hypoxia-associated resistance to radiation-induced cell damage. To improve RIT treatment of solid tumors, herein, radionuclide (131) I labeled human serum albumin (HSA)-bound manganese dioxide nanoparticles ((131) I-HSA-MnO2 ) are developed as a novel RIT nanomedicine platform that is responsive to the tumor microenvironment (TME)...
May 19, 2017: Small
https://www.readbyqxmd.com/read/28542743/neuroimaging-cardiovascular-physiology-and-functional-outcomes-in-infants-with-congenital-heart-disease
#4
REVIEW
Nathalie H P Claessens, Christopher J Kelly, Serena J Counsell, Manon J N L Benders
This review integrates data on brain dysmaturation and acquired brain injury using fetal and neonatal magnetic resonance imaging (MRI), including the contribution of cardiovascular physiology to differences in brain development, and the relationship between brain abnormalities and subsequent neurological impairments in infants with congenital heart disease (CHD). The antenatal and neonatal period are critical for optimal brain development; the developing brain is particularly vulnerable to haemodynamic disturbances during this time...
May 19, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/28542481/effect-of-hyperbaric-oxygen-on-bdnf-release-and-neuroprotection-investigations-with-human-mesenchymal-stem-cells-and-genetically-modified-nih3t3-fibroblasts-as-putative-cell-therapeutics
#5
Jennifer Schulze, Odett Kaiser, Gerrit Paasche, Hans Lamm, Andreas Pich, Andrea Hoffmann, Thomas Lenarz, Athanasia Warnecke
Hyperbaric oxygen therapy (HBOT) is a noninvasive widely applied treatment that increases the oxygen pressure in tissues. In cochlear implant (CI) research, intracochlear application of neurotrophic factors (NTFs) is able to improve survival of spiral ganglion neurons (SGN) after deafness. Cell-based delivery of NTFs such as brain-derived neurotrophic factor (BDNF) may be realized by cell-coating of the surface of the CI electrode. Human mesenchymal stem cells (MSC) secrete a variety of different neurotrophic factors and may be used for the development of a biohybrid electrode in order to release endogenously-derived neuroprotective factors for the protection of residual SGN and for a guided outgrowth of dendrites in the direction of the CI electrode...
2017: PloS One
https://www.readbyqxmd.com/read/28540739/hypoxia-imaging-and-radiotherapy-bridging-the-resolution-gap
#6
David Robert Grimes, Daniel R Warren, Samantha Warren
Oxygen distribution is a major determinant of treatment success in radiotherapy, with well-oxygenated tumour regions responding by up to a factor of three relative to anoxic volumes. Conversely, tumour hypoxia is associated with treatment resistance and negative prognosis. Tumour oxygenation is highly heterogeneous and difficult to measure directly. The recent advent of functional hypoxia imaging modalities such as fluorine-18 fluoromisonidazole positron emission tomography have shown promise in non-invasively determining regions of low oxygen tension...
May 25, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28539244/manganese-exposure-induces-neuroinflammation-by-impairing-mitochondrial-dynamics-in-astrocytes
#7
Souvarish Sarkar, Emir Malovic, Dilshan S Harischandra, Hilary A Ngwa, Anamitra Ghosh, Colleen Hogan, Dharmin Rokad, Gary Zenitsky, Huajun Jin, Vellareddy Anantharam, Anumantha G Kanthasamy, Arthi Kanthasamy
Chronic manganese (Mn) exposure induces neurotoxicity, which is characterized by Parkinsonian symptoms resulting from impairment in the extrapyramidal motor system of the basal ganglia. Mitochondrial dysfunction and oxidative stress are considered key pathophysiological features of Mn neurotoxicity. Recent evidence suggests astrocytes as a major target of Mn neurotoxicity since Mn accumulates predominantly in astrocytes. However, the primary mechanisms underlying Mn-induced astroglial dysfunction and its role in metal neurotoxicity are not completely understood...
May 21, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28538105/linezolid-induced-lactic-acidosis-the-thin-line-between-bacterial-and-mitochondrial-ribosomes
#8
Alessandro Santini, Dario Ronchi, Manuela Garbellini, Daniela Piga, Alessandro Protti
Introduction - Linezolid inhibits bacterial growth by targeting bacterial ribosomes and by interfering with bacterial protein synthesis. Lactic acidosis is a rare, but potentially lethal, side effect of linezolid. Areas covered - The pathogenesis of linezolid-induced lactic acidosis is reviewed with special emphasis on aspects relevant to the recognition, prevention and treatment of the syndrome. Expert opinion - Linezolid-induced lactic acidosis reflects the untoward interaction between the drug and mitochondrial ribosomes...
May 24, 2017: Expert Opinion on Drug Safety
https://www.readbyqxmd.com/read/28533386/metabolic-basis-to-sherpa-altitude-adaptation
#9
James A Horscroft, Aleksandra O Kotwica, Verena Laner, James A West, Philip J Hennis, Denny Z H Levett, David J Howard, Bernadette O Fernandez, Sarah L Burgess, Zsuzsanna Ament, Edward T Gilbert-Kawai, André Vercueil, Blaine D Landis, Kay Mitchell, Monty G Mythen, Cristina Branco, Randall S Johnson, Martin Feelisch, Hugh E Montgomery, Julian L Griffin, Michael P W Grocott, Erich Gnaiger, Daniel S Martin, Andrew J Murray
The Himalayan Sherpas, a human population of Tibetan descent, are highly adapted to life in the hypobaric hypoxia of high altitude. Mechanisms involving enhanced tissue oxygen delivery in comparison to Lowlander populations have been postulated to play a role in such adaptation. Whether differences in tissue oxygen utilization (i.e., metabolic adaptation) underpin this adaptation is not known, however. We sought to address this issue, applying parallel molecular, biochemical, physiological, and genetic approaches to the study of Sherpas and native Lowlanders, studied before and during exposure to hypobaric hypoxia on a gradual ascent to Mount Everest Base Camp (5,300 m)...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533314/exercise-metabolism-fuels-for-the-fire
#10
Mark Hargreaves, Lawrence L Spriet
During exercise, the supply of adenosine triphosphate (ATP) is essential for the energy-dependent processes that underpin ongoing contractile activity. These pathways involve both substrate-level phosphorylation, without any need for oxygen, and oxidative phosphorylation that is critically dependent on oxygen delivery to contracting skeletal muscle by the respiratory and cardiovascular systems and on the supply of reducing equivalents from the degradation of carbohydrate, fat, and, to a limited extent, protein fuel stores...
May 22, 2017: Cold Spring Harbor Perspectives in Medicine
https://www.readbyqxmd.com/read/28532824/puppy-survival-and-vigor-associated-with-the-use-of-low-dose-medetomidine-premedication-propofol-induction-and-maintenance-of-anesthesia-using-sevoflurane-gas-inhalation-for-cesarean-section-in-the-bitch
#11
K G M De Cramer, K E Joubert, J O Nöthling
The safety of an anesthetic protocol consisting of medetomidine hydrochloride (7 μg/kg iv) as premedicant, propofol, (1-2 mg/kg iv) as induction agent and sevoflurane, at 2% in oxygen for maintenance of anesthesia was studied in 292 cesarean sections (CSs) and 2232 puppies delivered. Medetomidine effects were reversed using atipamezole hydrochloride at 50 μg/puppy sc immediately following delivery and in the bitch iv immediately following surgery. The protocol's safety for puppies was expressed using survival immediately, 2 h and 7 d after delivery, and Apgar scores (measurement starting 15 min after delivery of the last puppy)...
July 1, 2017: Theriogenology
https://www.readbyqxmd.com/read/28528140/maternal-and-neonatal-outcomes-of-respiratory-failure-during-pregnancy
#12
Chen-Yiu Hung, Han-Chung Hu, Li-Chung Chiu, Chih-Hao Chang, Li-Fu Li, Chung-Chi Huang, Chuan-Chi Kao, Po-Jen Cheng, Kuo-Chin Kao
BACKGROUND: Obstetric patients comprise a limited portion of intensive care unit patients, but they often present with unfamiliar conditions and exhibit the potential for catastrophic deterioration. This study evaluated the maternal and neonatal outcomes of respiratory failure during pregnancy. METHODS: Information on 71 patients at >25 weeks gestation in the ICU with respiratory failure was recorded between 2009 and 2013. The characteristics and outcomes of mothers and fetuses were determined through a retrospective chart review and evaluated using Student's t test, chi-square test, and Fisher's exact test...
May 17, 2017: Journal of the Formosan Medical Association, Taiwan Yi Zhi
https://www.readbyqxmd.com/read/28526710/gbt1118-a-potent-allosteric-modifier-of-hemoglobin-oxygen-affinity-increases-tolerance-to-severe-hypoxia-in-mice
#13
Kobina Dufu, Ozlem Yalcin, Eilleen Sy Ao-Ieong, Athiwat Hutchaleelala, Qing Xu, Zhe Li, Nicholas Vlahakis, Donna Oksenberg, Josh Lehrer-Graiwer, Pedro Cabrales
Adaptation to hypoxia requires compensatory mechanisms that affect oxygen (O2) transport and utilization. Decreased hemoglobin (Hb)-O2 affinity is considered part of the physiological adaptive process to chronic hypoxia. This manuscript explores the hypothesis that increased Hb-O2 affinity can complement acute physiological responses to hypoxia by increasing O2 uptake and delivery when compared to normal Hb-O2 affinity during acute severe hypoxia. To test this hypothesis, mice Hb-O2 affinity was increased via oral administration of 70 or 140 mg/kg GBT1118...
May 19, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/28526086/comparison-of-fluid-balance-and-hemodynamic-and-metabolic-effects-of-sodium-lactate-versus-sodium-bicarbonate-versus-0-9-nacl-in-porcine-endotoxic-shock-a-randomized-open-label-controlled-study
#14
Thibault Duburcq, Arthur Durand, Anne-Frédérique Dessein, Joseph Vamecq, Jean-Claude Vienne, Dries Dobbelaere, Karine Mention, Claire Douillard, Patrice Maboudou, Valery Gmyr, François Pattou, Mercé Jourdain, Fabienne Tamion, Julien Poissy, Daniel Mathieu, Raphaël Favory
BACKGROUND: Sodium lactate has been shown to improve hemodynamics and avoid fluid overload. The objective of this study was to confirm a beneficial effect on fluid balance with sodium lactate infusion and to specify whether the advantage of lactate is related to a negative chloride balance, its particular metabolism, or simply its energy load. METHODS: This was an interventional, randomized, open-label, controlled experimental study. Fifteen female "large white" pigs (2 months old) were challenged with intravenous infusion of Escherichia coli endotoxin...
May 19, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28525513/an-observational-assessment-of-anesthesia-capacity-in-madagascar-as-a-prerequisite-to-the-development-of-a-national-surgical-plan
#15
Linden S Baxter, Vaonandianina A Ravelojaona, Hasiniaina N Rakotoarison, Alison Herbert, Emily Bruno, Kristin L Close, Vanessa Andean, Hery H Andriamanjato, Mark G Shrime, Michelle C White
BACKGROUND: The global lack of anesthesia capacity is well described, but country-specific data are needed to provide country-specific solutions. We aimed to assess anesthesia capacity in Madagascar as part of the development of a Ministry of Health national surgical plan. METHODS: As part of a nationwide surgical safety quality improvement project, we surveyed 19 of 22 regional hospitals, representing surgical facilities caring for 75% of the total population. The assessment was divided into 3 areas: anesthesia workforce density, infrastructure and equipment, and medications...
June 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28524032/-preoperative-risk-factors-analysis-of-pulmonary-hypertension-crisis-during-perioperative-period-for-caesarean-section-of-woman-with-severe-pulmonary-hypertension
#16
Chunlei Zhang, Yaguang Liu, Enming Qing, Jun Ma
OBJECTIVE: To analyze preoperative risk factors of perioperative pulmonary hypertension crisis (PHC) for pregnant woman with severe pulmonary artery hypertension (PAH), and approach its clinical value. METHODS: A retrospective analysis was conducted. The clinical data from 152 pregnant women with severe PAH underwent cesarean delivery admitted to Beijing Anzhen Hospital from January 1st 2008 to December 31st 2016 was collected. The patients were divided into two groups according to with perioperative PHC or not...
May 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28523351/severity-specific-alterations-in-cbf-oef-and-cmro2-in-cirrhotic-patients-with-hepatic-encephalopathy
#17
Gang Zheng, Hanzhang Lu, Wenkui Yu, Song Luo, Ya Liu, Wei Liu, Hui Liu, Long Wu, Lijuan Zheng, Xiang Kong, Long Jiang Zhang, Guang Ming Lu
OBJECTIVES: To assess how the severity of hepatic encephalopathy (HE) affects perfusion and metabolic changes in cirrhotic patients and the association between severity and liver disease and anemia. METHODS: The study groups comprised 31 healthy subjects and 33 cirrhotic patients who underwent MR examinations, and blood and neuropsychological tests. Of the cirrhotic patients, 14 were unaffected, and 11 had covert HE (CHE) and 8 overt HE (OHE). Global cerebral blood flow (CBF), oxygen extraction fraction (OEF), and metabolic rate of oxygen (CMRO2) were noninvasively measured by phase-contrast and T2-relaxation-under-spin-tagging MRI...
May 18, 2017: European Radiology
https://www.readbyqxmd.com/read/28523266/stimulating-fracture-healing-in-ischemic-environments-does-oxygen-direct-stem-cell-fate-during-fracture-healing
#18
REVIEW
Katherine R Miclau, Sloane A Brazina, Chelsea S Bahney, Kurt D Hankenson, Thomas K Hunt, Ralph S Marcucio, Theodore Miclau
Bone fractures represent an enormous societal and economic burden as one of the most prevalent causes of disability worldwide. Each year, nearly 15 million people are affected by fractures in the United States alone. Data indicate that the blood supply is critical for fracture healing; as data indicate that concomitant bone and vascular injury are major risk factors for non-union. However, the various role(s) that the vasculature plays remains speculative. Fracture stabilization dictates stem cell fate choices during repair...
2017: Frontiers in Cell and Developmental Biology
https://www.readbyqxmd.com/read/28521581/association-between-the-use-of-magnesium-sulfate-as-neuroprotector-in-prematurity-and-the-neonatal-hemodynamic-effects
#19
Rodrigo Dias Nunes, Flávia Duarte Schutz, Jefferson Luiz Traebert
PURPOSE: Cerebral palsy is often associated with prematurity and magnesium sulfate (MgSO4), has been used as neuroprotector, with favorable results. However, its mechanism of action has not been fully elucidated. This study aimed to evaluate the association between MgSO4 at the imminent premature delivery and neonatal hemodynamic effects. MATERIALS AND METHODS: A cross-sectional study involving 94 newborns (NB) between 24 and 32 weeks at a Brazilian hospital was performed...
May 19, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28521306/visible-light-sensitive-titanium-dioxide-nanoplatform-for-tumor-responsive-fe2-liberating-and-artemisinin-delivery
#20
Huijuan Zhang, Hongling Zhang, Xing Zhu, Xiaoge Zhang, Qianqian Chen, Jianjiao Chen, Lin Hou, Zhenzhong Zhang
Artemisinin is a kind of Fe2+-dependent drugs. Artemisinin and Fe2+ co-transport systems can improve its anti-tumor effect. In this study, a visible light-sensitive nanoplatform (HA-TiO2-IONPs/ART) was developed. Detailed investigation demonstrated that HA-TiO2-IONPs/ART could realize Fe2+ and artemisinin synchronous co-delivery and tumor-responsive release. This feature enhanced the anti-tumor efficiency of artemisinin significantly. In vitro results proved that hyaluronic acid modification could improve the biocompatibility, dispersion stability and cytophagy ability of nanocarriers...
May 5, 2017: Oncotarget
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