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Kasper Jacobsen Kyng, Anders Valdemar Edhager, Tine Brink Henriksen, Christer Zøylner Swan, Niels Gregersen, Johan Palmfeldt
BACKGROUND: Biomarkers may qualify diagnosis, treatment allocation, and prognostication in neonatal encephalopathy. Biomarker development is challenged by competing etiologies, inter-individual genetic variability, and a lack of specific neonatal markers. To address these challenges, we used a standardized neonatal hypoxic-ischemic (HI) encephalopathy model with pre- and post-HI sampling of cerebrospinal fluid (CSF) and plasma. OBJECTIVES: The study aimed to identify novel candidate protein biomarkers of HI encephalopathy in a newborn piglet model in CSF and plasma...
July 19, 2018: Neonatology
Charandeep Singh, Amit Sharma, George Hoppe, Weilin Song, Youstina Bolok, Jonathan E Sears
Purpose: Transcriptional analysis of retina protected by hypoxia-inducible factor (HIF) stabilization demonstrates an increase in genes associated with aerobic glycolysis. We hypothesized that since protection is associated with a change in metabolism, oxygen-induced metabolites might transduce oxygen toxicity. We used global metabolic profiling to identify retinal metabolites increased in hyperoxia compared to normoxia. Methods: Untargeted gas chromatography mass spectroscopy (GC-MS) was performed on both mouse retina samples collected in hyperoxia and on primary human retinal endothelial cells, each with and without HIF stabilization...
July 2, 2018: Investigative Ophthalmology & Visual Science
David W Sant, Vladimir Camarena, Sushmita Mustafi, Yiwen Li, Zachary Wilkes, Derek Van Booven, Rong Wen, Gaofeng Wang
Purpose: To investigate the impact of ascorbate, via DNA hydroxymethylation, on VEGF expression in retinal pigment epithelial (RPE) cells. Methods: Dot-blot and hydroxymethylated DNA immunoprecipitation sequencing were applied to evaluate the impact of ascorbate on DNA hydroxymethylation in ARPE-19 cells. RNA sequencing (RNA-seq) was carried out to analyze the transcriptome. Quantitative RT-PCR and ELISA were conducted to examine the transcription and secretion of VEGF from cultured cells...
July 2, 2018: Investigative Ophthalmology & Visual Science
Maria Vähätupa, Janika Nättinen, Antti Jylhä, Ulla Aapola, Marko Kataja, Peeter Kööbi, Tero A H Järvinen, Hannu Uusitalo, Hannele Uusitalo-Järvinen
Purpose: Oxygen-induced retinopathy (OIR) is the most widely used model for ischemic retinopathies such as retinopathy of prematurity (ROP), proliferative diabetic retinopathy (PDR), and retinal vein occlusion (RVO). The purpose of this study was to perform the most comprehensive characterization of OIR by a recently developed technique, sequential window acquisition of all theoretical mass spectra (SWATH-MS) proteomics. Methods: Control and OIR retina samples collected from various time points were subjected to SWATH-MS and detailed data analysis...
July 2, 2018: Investigative Ophthalmology & Visual Science
Lian-Hua Fu, Chao Qi, Jing Lin, Peng Huang
Glucose oxidase (GOx) is an endogenous oxido-reductase that is widely distributed in living organisms. Over recent years, GOx has attracted increasing interest in the biomedical field due to its inherent biocompatibility, non-toxicity, and unique catalysis against β-d-glucose. GOx efficiently catalyzes the oxidization of glucose into gluconic acid and hydrogen peroxide (H2O2), which can be employed by various biosensors for the detection of cancer biomarkers. Various cancer therapeutic strategies have also been developed based on the catalytic chemistry of GOx: (1) the consumption of glucose provides an alternative strategy for cancer-starvation therapy; (2) the consumption of oxygen increases tumor hypoxia, which can be harnessed for hypoxia-activated therapy; (3) the generation of gluconic acid enhances the acidity of the tumor microenvironment, which can trigger pH-responsive drug release; (4) the generation of H2O2 increases the levels of tumor oxidative stress, and the H2O2 can be converted into toxic hydroxyl radicals that can kill cancer cells upon exposure to light irradiation or via the Fenton reaction...
July 19, 2018: Chemical Society Reviews
Mingzi Zhang, Shu Liu, Enling Guan, Hao Liu, Xinhang Dong, Yan Hao, Xin Zhang, Pengxiang Zhao, Xuehua Liu, Shuyi Pan, Youbin Wang, Xiaojun Wang, Yifang Liu
BACKGROUND: Hyperbaric oxygen therapy (HBOT) has been widely used in the clinical setting. In this study, HBOT therapy was evaluated for its ability to ameliorate the epithelial-to-mesenchymal transition (EMT) phenomenon in keloid tissue. METHODS: Keloid patients were randomly divided into two groups: keloid patients (K group, 9 patients) and keloid patients receiving HBOT (O group, 9 patients). A third group with normal skin (S group, 9 patients) was established for control...
July 2018: Medicine (Baltimore)
Axel Przyklenk, Thorben Aussieker, Boris Gutmann, Thorsten Schiffer, Christian Brinkmann, Heiko K Strüder, Wilhelm Bloch, Andreas Mierau, Sebastian Gehlert
Przyklenk, A, Aussieker, T, Gutmann, B, Schiffer, T, Brinkmann, C, Strüder, HK, Bloch, W, Mierau, A, and Gehlert, S. Effects of endurance exercise bouts in hypoxia, hyperoxia, and normoxia on mTOR-related protein signaling in human skeletal muscle. J Strength Cond Res XX(X): 000-000, 2018-This study investigated the effects of short-term hypoxia (HY), hyperoxia (PER), and normoxia on anabolic signaling proteins in response to an acute bout of moderate endurance exercise (EEX) before and after an endurance exercise training intervention...
July 17, 2018: Journal of Strength and Conditioning Research
Ruifei Zhang, Xiao Feng, Guozhu Su, Zejing Mu, Hexinge Zhang, Yanan Zhao, Shungang Jiao, Lan Cao, Suyile Chen, Pengfei Tu, Xingyun Chai
Fourteen new sesquiterpenoids, alashanoids A-H (1, 2, and 4-9), (+)-2,9-humuladien-6-ol-8-one (3b), and five pairs of enantiomers (1 and 4-7), along with eight known analogues (3a and 10-16) were isolated from the stems of Syringa pinnatifolia. The structures were established using IR, UV, MS, and NMR data. The absolute configurations of the new compounds were resolved by X-ray diffraction, a modification of Mosher's method, and experimental and calculated ECD data analysis. The new sesquiterpenoids represent three skeletons: a rare 2,2,5,9-tetramethylbicyclo[6...
July 19, 2018: Journal of Natural Products
Somoshree Sengupta, Chandra Khatua, Vamsi K Balla
Nowadays, tumor hypoxia has become a more predominant problem for diagnosis as well as treatment of cancer due to difficulties in delivering chemotherapeutic drugs and their carriers to these regions with reduced vasculature and oxygen supply. In such cases, external physical stimulus-mediated drug delivery, such as ultrasound and magnetic fields, would be effective. In this work, the effect of simultaneous exposure of low-intensity pulsed ultrasound and static magnetic field on colon (HCT116) and hepatocellular (HepG2) carcinoma cell inhibition was assessed in vitro...
May 31, 2018: ACS Omega
Chiara Robba, Lorenzo Ball, Paolo Pelosi
No abstract text is available yet for this article.
June 2018: Journal of Thoracic Disease
Lindsey Eldridge, Elizabeth M Wagner
Both systemic (tracheal and bronchial) and pulmonary circulations perfuse the lung. However, documentation of angiogenesis of either is complicated by the presence of the other. Well-documented angiogenesis of the systemic circulations have been identified in asthma, cystic fibrosis, chronic thromboembolism, and primary carcinomas. Angiogenesis of the vasa vasorum, which are branches of bronchial arteries, is seen in the walls of large pulmonary vessels after a period of chronic hypoxia. Documentation of increased pulmonary capillaries has been shown in models of chronic hypoxia, after pneumonectomy, and in some carcinomas...
July 18, 2018: Journal of Physiology
Max J Hilz, Mao Liu, Sankanika Roy, Ruihao Wang
Autonomic dysfunction is common in neuro-critical care patients and may compromise the function of various organs. Among the many diseases causing or being associated with autonomic dysfunction are traumatic brain injury, cerebrovascular diseases, epilepsy, Guillain-Barré syndrome (GBS), alcohol withdrawal syndrome, botulism and tetanus, among many others. Autonomic dysfunction may afflict various organs and may involve hyper- or hypo-activity of the sympathetic or parasympathetic system. In this short overview, we address only a small number of neuro-intensive care diseases with autonomic dysfunction...
July 18, 2018: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
Yujiao Cai, Wensheng Wang, Yuan Qiu, Min Yu, Jiuheng Yin, Hua Yang, Jie Mei
OBJECTIVE: Intestinal ischemia-reperfusion (I/R) causes direct cellular damage, and the potential injury to the mucosal structure and barrier function. Keratinocyte growth factor (KGF) is highly expressed in gastrointestinal tract and exerts beneficial effects for intestinal epithelial growth and maintenance. E-cadherin plays an important role in intestinal epithelium renewal. However, the regulatory role of KGF on E-cadherin levels and I/R-induced apoptosis remain to be explored. The present study aimed to identify the effect of KGF on E-cadherin expression and I/R-induced intestinal epithelial cell apoptosis...
September 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
Susu Han, Tao Huang, Wen Li, Shanshan Liu, Wei Yang, Qi Shi, Hongjia Li, Jianlin Ren, Fenggang Hou
BACKGROUND/AIMS: Although some studies showed that HIF-2α expression was correlated with an unfavorable prognosis in colorectal cancer (CRC), the prognostic results remain conflicting in CRC. The present study was performed to evaluate the association between HIF-2α expression and the clinicopathological features of this disease and to examine the potential prognostic role of HIF-2α expression in CRC. METHODS: Pooled odds ratios (ORs) or hazard ratios (HRs) were calculated from available publications, The Cancer Genome Atlas (TCGA) and the Gene Expression Omnibus (GEO) datasets...
July 18, 2018: Cellular Physiology and Biochemistry
Anne Gro W Rognlien, Embjørg J Wollen, Monica Atneosen-Åsegg, Rajikala Suganthan, Magnar Bjørås, Ola Didrik Saugstad
BACKGROUND: 8-Oxoguanine DNA-glycosylase 1 (OGG1) and mutY DNA glycosylase (MUTYH) are crucial in the repair of the oxidative DNA lesion 7,8-dihydro-8-oxoguanine caused by hypoxia-reoxygenation injury. Our objective was to compare the gene expression changes after hypoxia-reoxygenation in neonatal Ogg1-Mutyh double knockout mice (OM) and wildtype mice (WT), and study the gene response in OM after hyperoxic reoxygenation compared to normoxic. METHODS: Postnatal day 7 mice were subjected to 2 h of hypoxia (8% O2) followed by reoxygenation in either 60% O2 or air, and sacrificed right after completed reoxygenation (T0h) or after 72 h (T72h)...
July 18, 2018: Journal of Perinatal Medicine
Alexandre Abel, Bertrand Baron, Frédéric Grappe, Marc Francaux
The purpose of this study was to analyze the pacing strategy and its affective consequences during self-paced cycling time trials (TT) performed at different severity of hypoxia. Eight competitive cyclists performed five 30 min self-paced TTs at their best performance in the following conditions: 1) normobaric normoxia (NNSL ); 2) normobaric hypoxia under two simulated altitudes: 2000 m (NH2000 ) and 3500 m (NH3500 ) and 3) normobaric hypoxia but the cyclists were deceived and thought to be at sea level for 2000 m (DecNH2000 ) and 3500 m (DecNH3500 )...
July 18, 2018: Journal of Sports Sciences
Jessica Vanderstraeten, Hanane Derradji, Pierre Sonveaux, Ides Colin, Marie-Christine Many, Anne-Catherine Gérard
Iodine deficiency (ID), which affects almost two billion people worldwide, is associated with breast pathologies such as fibrosis in human and induces breast atypia in animal models. Because ID induces vascular activation in the thyroid, another iodide-uptaking organ, and as breast is also sensitive to ID, we aimed to characterize ID-induced effects on the breast microvasculature in vivo and in two different breast cell lines in vitro. Virgin and lactating NMRI mice received an iodide-deficient diet and a Na+ /I- symporter inhibitor for one to 20 days...
July 18, 2018: American Journal of Physiology. Cell Physiology
Shikshya Timalsina, Kyoko Arimoto-Matsuzaki, Masami Kitamura, Xiaoyin Xu, Qiu Wenzhe, Mari Ishigami-Yuasa, Hiroyuki Kagechika, Yutaka Hata
In eukaryotic cells, when exposed to certain types of stress including hypoxia, eIF2α is phosphorylated by several kinases including protein kinase R (PKR) and PKR-like endoplasmic reticulum kinase (PERK). Subsequently, protein translation is stopped and stress granules (SGs) are formed. Cancer cells form SGs under hypoxia. SGs accumulate apoptosis-related molecules and play anti-apoptotic roles. Thus, hypoxia-induced SG formation contributes to drug resistance in cancer cells. For this reason, inhibition of SG formation is expected to be beneficial in cancer therapy...
July 17, 2018: Journal of Biochemistry
Niels P Riksen, Rinke Stienstra
PURPOSE OF REVIEW: It is increasingly recognized that profound metabolic changes occur in activated myeloid cells, which shape their inflammatory phenotype and cellular functions. The purpose of this review is to summarize the accumulating evidence that major metabolic adaptations occur in monocytes and macrophages in the context of atherosclerosis ultimately modulating atherosclerotic plaque formation. RECENT FINDINGS: Plaque macrophages show a profound metabolic reprogramming which is driven by atherogenic factors in the plaque microenvironment, such as damage associated molecular patterns, modified lipoproteins, and hypoxia...
July 16, 2018: Current Opinion in Lipidology
Jennifer E Thropp, Jeffrey F V Scallon, Paul Buza
BACKGROUND: PERCLOS is a metric that has been primarily studied in the domain of driver fatigue to predict performance decrements, but there is comparatively less research applying it to aviation, where hypoxia is a safety concern. Hypoxic exposure was expected to increase blink activity, possibly by means of impairing blink inhibition behavior, thereby leading to increased eyelid closure time. METHODS: PERCLOS, blink rate, and blink duration were measured using head-mounted eye-tracking on pilots using a flight simulator inside a hypobaric chamber...
August 1, 2018: Aerospace Medicine and Human Performance
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