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chronic intermittent hypoxia

Kay D Beharry, Charles L Cai, Taimur Ahmad, Sibel Guzel, Gloria B Valencia, Jacob V Aranda
Neonatal intermittent hypoxia (IH) followed by re-oxygenation in normoxia or supplemental oxygen (IHR) increases the risk for severe retinopathy of prematurity (ROP). The exact timing for the onset of retinal damage which may guide strategic interventions during retinal development, is unknown. We tested the hypothesis that chronic exposure of the immature retina to neonatal IH induces early manifestations of retinal damage that can be utilized as key time points for strategic pharmacologic intervention. Newborn rats were exposed to IH within 2 hours of birth (P0) until P14, or allowed to recover in room air (RA) from P14 to P21 (IHR)...
2018: Journal of Nature and Science
Fu-Chao Yu, Chu-Xiao Yuan, Jia-Yi Tong, Guang-Hao Zhang, Fang-Ping Zhou, Fang Yang
Intermittent hypoxia (IH) induced by obstructive sleep apnea (OSA) is the key factor in oxidative stress and the concomitant inflammation of endothelial cells (ECs). In recent years, the lipid sphingosine-1-phosphate (S1P) has been reported to probably play a central role in inflammatory diseases. However, its role in IH-induced endothelial injury remains uncertain. In this study, we investigated the IH-induced ECs inflammation and apoptosis, as well as the role of S1P in both. First, human umbilical vein endothelial cells (HUVECs) were treated with IH to explore the mechanism of S1P and S1P microbubbles (S1P-MBs) in HUVECs with altered function...
March 16, 2018: Biochemical and Biophysical Research Communications
Xiaofeng Zhang, Lijun Rui, Mei Wang, Hairong Lian, Liming Cai
BACKGROUND In the present study, we aimed to investigate the effects of sinomenine (SIN) on chronic intermittent hypoxia (CIH)- induced lung injury in rats, and to explore the underlying mechanisms. MATERIAL AND METHODS To perform the investigation, a CIH rat model was established. ELISA assay was applied to detect the level of inflammatory cytokines. Oxidative stress bio-markers (MDA, SOD, and CAT) were determined in lung tissues. In addition, the expression level of NADPH oxidase 2 (Nox2) was analyzed by Western blotting and qRT-PCR, respectively...
March 17, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
Charles Cai, Taimur Ahmad, Gloria B Valencia, Jacob V Aranda, Jiliu Xu, Kay D Beharry
OBJECTIVES: Extremely low gestational age neonates with chronic lung disease requiring oxygen therapy frequently experience fluctuations in arterial oxygen saturation or intermittent hypoxia (IH). These infants are at risk for multi-organ developmental delay, reduced growth, and short stature. The growth hormone (GH)/insulin-like growth factor-I (IGF-1) system, an important hormonal regulator of lipid and carbohydrate metabolism, promotes neonatal growth and development. We tested the hypothesis that increasing episodes of IH delay neonatal growth by influencing the GH/IGF-I axis...
March 8, 2018: Growth Hormone & IGF Research
Ryan L Sheppard, Joshua M Swift, Aaron Hall, Richard T Mahon
Introduction: Individuals with a known susceptibility to high altitude pulmonary edema (HAPE) demonstrate a reduced ventilation response and increased pulmonary vasoconstriction when exposed to hypoxia. It is unknown whether reduced sensitivity to hypercapnia is correlated with increased incidence and/or severity of HAPE, and while acute exercise at altitude is known to exacerbate symptoms the effect of exercise training on HAPE susceptibility is unclear. Purpose: To determine if chronic intermittent hypercapnia and exercise increases the incidence of HAPE in rats...
2018: Frontiers in Physiology
E Nicole Wilson, Marc Anderson, Brina Snyder, Phong Duong, Jenny Trieu, Derek A Schreihofer, Rebecca L Cunningham
Sleep apnea is a common sleep disorder characterized by intermittent periods of low blood oxygen levels. The risk for sleep apnea increases with age and is more prevalent in men than women. A common comorbidity of sleep apnea includes male sexual dysfunction, but it is not clear if a causal relationship exists between sleep apnea and sexual dysfunction. Possible mechanisms that link these two disorders include oxidative stress and testosterone. Oxidative stress is elevated in clinical patients with sleep apnea and in rodents exposed to chronic intermittent hypoxia (CIH), an animal model for apnea-induced hypopnea...
March 8, 2018: Physiology & Behavior
Stéphanie Conotte, Alexandra Tassin, Raphaël Conotte, Jean-Marie Colet, Karim Zouaoui Boudjeltia, Alexandre Legrand
Chronic intermittent hypoxia (ChIH) is a dominant feature of obstructive sleep apnoea (OSA) and is associated to metabolic alterations and oxidative stress (OS). Although management of OSA is well established, the research of new biomarkers that are independent of confounding factors remains necessary to improve the early detection of comorbidity and therapeutic follow-up. In this study, the urinary metabonomic profile associated to intermittent hypoxia was evaluated in a mouse model. When exposed to intermittent hypoxia, animals showed a significant alteration in energy metabolism towards anaerobic pathways and signs of OS imbalance...
March 6, 2018: Respiratory Physiology & Neurobiology
Huina Zhang, Fan Yang, Yichen Guo, Li Wang, Fang Fang, Hao Wu, Shaoping Nie, Yifan Wang, Man-Lung Fung, Yu Huang, Haiteng Deng, Yanwen Qin, Xinliang Ma, Yongxiang Wei
OBJECTIVE: Obstructive sleep apnea hypopnea syndrome (OSAHS) is an independent risk factor for many clinical complications. However, how OSAHS cause multiple organ injury and initiate inter-organ communication remains unclear. Moreover, despite it is well-recognized that chronic intermittent hypoxia (CIH) is a main feature of OSAHS, specific contribution of CIH to overall OSAHS-initiated pathological complications remains unclear. This study aimed to use an unbiased proteomic approach to determine whether OSAHS alters protein profiles of serum extracellular microvesicles (SEMVs) and how CIH contributes to such alterations...
March 6, 2018: Metabolism: Clinical and Experimental
Lei Gao, Jun Liu, Yongmei Hao, Zengren Zhao, Huilian Tan, Jie Zhang, Ning Meng, Qinghou Zheng, Zhen Wang, Yi Zhang
Objectives: Inflammation is involved in various forms of pulmonary arterial hypertension (PAH). Although the pathophysiology of PAH remains uncertain, NF-κB and p38 mitogen-activated protein kinase (p38 MAPK) has been reported to be associated with many inflammatory mediators of PAH. This study aimed to evaluate the effect of chronic intermittent hypobaric hypoxia (CIHH) on pulmonary inflammation and remodeling in monocrotaline (MCT) induced PAH in rats. Materials and Methods: An in vivo model of PAH induced by MCT was employed...
March 2018: Iranian Journal of Basic Medical Sciences
Z-W Wen, D-S Liang, X-H Cai, J Chen
OBJECTIVE: To investigate the role of AMPK-mTOR signal pathway in brain injury induced by chronic intermittent hypoxia (CIH) in young rats. MATERIALS AND METHODS: Forty healthy male Sprague-Dawley rats (3-4 weeks old, weighing 80-100 g) were randomly assigned to four groups: 2-week-CIH group (2IH), 4-week-CIH group (4IH), 2-week-simulated air control group (2AC) and 4-week-simulated air control group (4AC). TUNEL staining was used to detect the cell apoptosis in the hippocampus and pre-frontal cortexes, respectively...
February 2018: European Review for Medical and Pharmacological Sciences
Şenay Aydin, Cengiz Özdemir, Cem Ismail Küçükali, Sinem Nedime Sökücü, Murat Giriş, Uğur Akcan, Erdem Tüzün
BACKGROUND/AIM: Obstructive sleep apnea syndrome (OSAS) is associated with intermittent episodes of hypoxia, endothelial dysfunction and associated cardiovascular problems. Our aim was to investigate whether OSAS-related hypoxia alters the expression of rho-associated protein kinase (ROCK), a marker of chronic hypoxia and endothelial dysfunction. MATERIALS AND METHODS: ROCK1 and ROCK2 levels were measured by immunoblotting in peripheral blood mononuclear cells (PBMC) of 47 OSAS patients and 17 healthy controls...
March 2018: In Vivo
Fang Li, Xiao-Xue Fan, Chun Chu, Yu Zhang, Jun-Ping Kou, Bo-Yang Yu
BACKGROUND/AIMS: Traditional Chinese medicine (TCM) has been used in clinical practice for thousands of years and has accumulated considerable knowledge concerning the in vivo efficacy of targeting complicated diseases. TCM formulae are a mixture of hundreds of chemical components with multiple potential targets, essentially acting as a combination therapy of multi-component drugs. However, the obscure substances and the unclear molecular mechanisms are obstacles to their further development and internationalization...
February 16, 2018: Cellular Physiology and Biochemistry
Jessica Morand, Claire Arnaud, Jean-Louis Pepin, Diane Godin-Ribuot
We investigated the effects of intermittent hypoxia (IH), such as that encountered in severe obstructive sleep apnea (OSA) patients, on the development and severity of myocardial ischemia-related ventricular arrhythmias. Rats were exposed to 14 days of IH (30 s at 5%O 2 and 30 s at 21%O 2 , 8 h·day -1 ) or normoxia (N, similar air-air cycles) and submitted to a 30-min coronary ligature. Arterial blood pressure (BP) and ECG were recorded for power spectral analysis, ECG interval measurement and arrhythmia quantification...
February 14, 2018: Scientific Reports
Yinglan Peng, Ke Hu
The present study investigated the effect of garlic (G) on serum, liver, renal and cerebral parameters of rats with chronic intermittent hypoxia (CIH) combined with diabetes mellitus (DM). A total of 32 rats were divided into eight groups, with 4 rats/group. A total of three models were established, including CIH, DM and CIH‑DM, and an additional healthy control (C) group. Rats in C‑G, CIH‑G, DM‑G and CIH‑DM‑G groups were injected with a G extract daily. Serum, liver, renal and cerebral parameters were detected...
February 7, 2018: Molecular Medicine Reports
Sara L Bober, John Ciriello, Douglas L Jones
Obstructive sleep apnea (OSA), which involves chronic, intermittent hypoxia (CIH), is a major risk factor for developing atrial fibrillation (AF). Whether or not CIH alone alters cardiac mechanisms to support AF is unknown. This study investigated the effects of CIH on atrial electrophysiology and arrhythmia vulnerability, and evaluated the role of autonomics in CIH promotion of AF. Adult male Sprague-Dawley rats were exposed to 8h/day of CIH or normoxia for 7 days. Following exposure, rats were anesthetized for intracardiac electrophysiological studies...
February 9, 2018: American Journal of Physiology. Heart and Circulatory Physiology
Dongmei Song, Guoqiang Fang, Sun-Zhong Mao, Xiaobing Ye, Gang Liu, Edmund J Miller, Harly Greenberg, Shu Fang Liu
BACKGROUND AND AIMS: Chronic intermittent hypoxia (CIH) exposure causes atherosclerosis, although the underlying mechanisms are poorly understood. This study defines the role of endothelial intrinsic NF-κB signaling in the atherogenic response to CIH. METHODS: We created ApoE-ECI-κBmt mice that are deficient in the apolipoprotein E gene (ApoE-/-) and overexpress an I-κBα mutant (I-κBmt) selectively in endothelial cells. ApoE-/- and ApoE-ECI-κBmt mice were fed a normal chow diet (NCD) or high cholesterol diet (HCD) and exposed to sham or CIH, and atherosclerotic lesions were quantified...
January 30, 2018: Atherosclerosis
Fu Congrui, Li Na, Yuan Yujia, Wang Ri, Chen Jinting, Yang Jing, Guo Zan, Wang Sheng, Zhang Yi, Liu Yixian, Dong Jinghui
Many studies have demonstrated that chronic intermittent hypobaric hypoxia (CIHH) can reduce blood pressure in spontaneously hypertensive rats and renovascular hypertensive (RVH) rats in which endothelial dysfunction is determined as a critical factor. However, whether CIHH can regulate vasodilation of the aorta in RVH rats remains unknown. The purpose of this study was to investigate the effect of CIHH on impaired relaxation of the aorta in the two-kidney one-clip (2K1C) RVH rat model. The results showed CIHH improved the impaired endothelium-dependent relaxation in the 2K1C rat aorta...
February 3, 2018: Canadian Journal of Physiology and Pharmacology
Silvia V Conde
Its now 26 years since the publication of a seminal study that showed that carotid body (CB) chemoreceptors are involved in the progression of chronic intermittent hypoxia-induced hypertension. This article is protected by copyright. All rights reserved.
January 31, 2018: Journal of Physiology
Uday Yanamandra, S P Singh, Sushma Yanamandra, Deepak Mulajkar, R S Grewal, Shashibala Singh, M Z Ashraf, Prasanna Reddy, Velu Nair
Background: Chronic intermittent hypoxia is known to induce systemic arterial hypertension whereas chronic hypoxia causes pulmonary arterial hypertension. High altitude (HA) induced systemic hypertension (HASH) in previously normotensive lowlanders following acclimatisation and prolonged stay at moderate HA is a commonly encountered medical problem. HASH has been attributed to increased sympathetic discharge. Endothelial dysfunction (ED) is implicated in hypertension in the plains hence this study was conducted in HA...
October 2017: Medical Journal, Armed Forces India
Weiding Wang, Kai Zhang, Xiongfeng Li, Zuowang Ma, Yue Zhang, Meng Yuan, Ya Suo, Xue Liang, Gary Tse, Christos A Goudis, Tong Liu, Guangping Li
INTRODUCTION: Atrial structural remodeling in the form of fibrosis contributes to the arrhythmic substrate in atrial fibrillation (AF). The aim of this study was to investigate the effects of doxycycline on chronic intermittent hypoxia (CIH)-induced atrial fibrosis and the pathophysiological mechanisms underlying such changes. METHODS: A total of 30 Sprague-Dawley rats were randomized into three groups: Control group, CIH group, CIH with doxycycline treatment (CIH-D) group...
January 29, 2018: Cardiovascular Therapeutics
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