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intermittent hypoxia

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https://www.readbyqxmd.com/read/29159869/acute-intermittent-hypoxia-with-concurrent-hypercapnia-evokes-p2x-and-trpv1-receptor-dependent-sensory-long-term-facilitation-in-na%C3%A3-ve-carotid-bodies
#1
Arijit Roy, Melissa M J Farnham, Fatemeh Derakhshan, Paul M Pilowsky, Richard J A Wilson
Apneas constitute an acute existential threat to neonates and adults. In large part, this threat is detected by the carotid bodies, the primary peripheral chemoreceptors, and combatted by arousal and acute cardiorespiratory responses, including increased sympathetic output. Similar responses occur with repeated apneas but they continue beyond the last apnea and can persist for hours (i.e. ventilatory and sympathetic LTF). These long-term effects may be adaptive during acute episodic apnea, but may prolong hypertension causing chronic cardiovascular impairment...
November 21, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29154950/murine-models-of-sleep-apnea-functional-implications-of-altered-macrophage-polarity-and-epigenetic-modifications-in-adipose-and-vascular-tissues
#2
Wojciech Trzepizur, Rene Cortese, David Gozal
Obstructive sleep apnea (OSA) is a highly prevalent disease across the lifespan, is characterized by chronic intermittent hypoxia and sleep fragmentation, and has been independently associated with substantial cardiometabolic morbidity. However, the reversibility of end-organ morbidity with treatment is not always apparent, suggesting that both tissue remodeling and epigenetic mechanisms may be operationally involved. Here, we review the cumulative evidence focused around murine models of OSA to illustrate the temporal dependencies of cardiometabolic dysfunction and its reversibility, and more particularly to discuss the critical contributions of tissue macrophages to adipose tissue insulin resistance and vascular atherogenesis...
November 15, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29148180/dna-methylation-in-the-central-and-efferent-limbs-of-the-chemo-reflex-requires-carotid-body-neural-activity
#3
Jayasri Nanduri, Ying-Jie Peng, Ning Wang, Shakil A Khan, Gregg L Semenza, Nanduri R Prabhakar
Long-term exposure to intermittent hypoxia (LT-IH; 30 days), simulating blood O2 profiles during sleep apnea, has been shown to repress anti-oxidant enzyme (AOE) gene expression by DNA methylation in the carotid body (CB) reflex pathway, resulting in persistent elevation of plasma catecholamine levels and blood pressure. The present study examined the mechanisms by which LT-IH induces DNA methylation. Adult rats exposed to LT-IH showed elevated reactive oxygen species (ROS) in the CB, nucleus tractus solitarius (nTS) and rostroventrolateral medulla (RVLM) and adrenal medulla (AM), which represent the central and efferent limbs of the CB reflex, respectively...
November 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29147813/noninvasive-induction-of-angiogenesis-in-tissues-by-external-suction-sequential-optimization-for-use-in-reconstructive-surgery
#4
G Giatsidis, L Cheng, A Haddad, K Ji, J Succar, L Lancerotto, J Lujan-Hernandez, P Fiorina, H Matsumine, D P Orgill
In reconstructive surgery, tissues are routinely transferred to repair a defect caused by trauma, cancer, chronic diseases, or congenital malformations; surgical transfer intrinsically impairs metabolic supply to tissues placing a risk of ischemia-related complications such as necrosis, impaired healing, or infection. Pre-surgical induction of angiogenesis in tissues (preconditioning) can limit postsurgical ischemic complications and improve outcomes, but very few preconditioning strategies have successfully been translated to clinical practice due to the invasiveness of most proposed approaches, their suboptimal effects, and their challenging regulatory approval...
November 17, 2017: Angiogenesis
https://www.readbyqxmd.com/read/29145148/honokiol-protects-pancreatic-%C3%AE-cell-against-high-glucose-and-intermittent-hypoxia-induced-injury-by-activating-nrf2-are-pathway-in-vitro-and-in-vivo
#5
Chen-Guang Li, Chang-Lin Ni, Min Yang, Yun-Zhao Tang, Zhu Li, Yan-Juan Zhu, Zhen-Huan Jiang, Bei Sun, Chun-Jun Li
Obstructive sleep apnea hypopnea syndrome (OSAHS) is associated with glucose intolerance, insulin resistance and type 2 diabetes mellitus (T2DM). Although several studies have revealed that intermittent hypoxia (IH) in OSAHS may further aggravate pancreatic β cell damage and promote the evolution of type 2 diabetes (T2DM) by increasing oxidative stress, the underlying mechanisms are unclear. Honokiol, a potent radical scavenger, has been demonstrated to ameliorate oxidative stress in many cases. The present study aimed to explore the potential mechanism of IH and diabetes synergistically damage and destruct the pancreatic β cell, examine the effects of honokiol on ameliorating pancreatic β cell injury in this context and explore the mechanism of such effects...
November 13, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29130497/ubc-nepal-expedition-acclimatization-to-high-altitude-increases-spinal-motoneurone-excitability-during-fatigue-in-humans
#6
Luca Ruggiero, Alexandra F Yacyshyn, Jane Nettleton, Chris J McNeil
The fatigue-induced failure of the motor cortex to drive muscles maximally increases in acute hypoxia (AH) compared to normoxia (N) but improves with acclimatization (chronic hypoxia; CH). Despite their importance to muscle output, it is unknown how locomotor motoneurones in humans are affected by hypoxia and acclimatization. Eleven participants performed 16 min of submaximal (25% maximal torque, MVC) intermittent isometric elbow flexions in N, AH (environmental chamber), and CH (7-14 days at 5050 m) (PI O2 =  140, 74, and 76 mmHg, respectively)...
November 11, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29129021/the-effect-of-natural-or-simulated-altitude-training-on-high-intensity-intermittent-running-performance-in-team-sport-athletes-a-meta-analysis
#7
REVIEW
Michael J Hamlin, Catherine A Lizamore, Will G Hopkins
BACKGROUND: While adaptation to hypoxia at natural or simulated altitude has long been used with endurance athletes, it has only recently gained popularity for team-sport athletes. OBJECTIVE: To analyse the effect of hypoxic interventions on high-intensity intermittent running performance in team-sport athletes. METHODS: A systematic literature search of five journal databases was performed. Percent change in performance (distance covered) in the Yo-Yo intermittent recovery test (level 1 and level 2 were used without differentiation) in hypoxic (natural or simulated altitude) and control (sea level or normoxic placebo) groups was meta-analyzed with a mixed model...
November 11, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29125327/obstructive-sleep-apnea-severity-affects-amyloid-burden-in-cognitively-normal-elderly-a-longitudinal-study
#8
Ram A Sharma, Andrew W Varga, Omonigho M Bubu, Elizabeth Pirraglia, Korey Kam, Ankit Parekh, Margaret Wohlleber, Margo D Miller, Andreia Andrade, Clifton Lewis, Samuel Tweardy, Maja Buj, Po L Yau, Reem Sadda, Lisa Mosconi, Yi Li, Tracy Butler, Lidia Glodzik, Els Fieremans, James S Babb, Kaj Blennow, Henrik Zetterberg, Shou E Lu, Sandra G Badia, Sergio Romero, Ivana Rosenzweig, Nadia Gosselin, Girardin Jean-Louis, David M Rapoport, Mony J de Leon, Indu Ayappa, Ricardo S Osorio
RATIONALE: Recent evidence suggests that Obstructive Sleep Apnea (OSA) may be a risk factor for developing Mild Cognitive Impairment and Alzheimer's disease. However, how sleep apnea affects longitudinal risk for Alzheimer's disease is less well understood. OBJECTIVE: To test the hypothesis that there is an association between severity of OSA and longitudinal increase in amyloid burden in cognitively normal elderly. METHODS: Data was derived from a 2-year prospective longitudinal study that sampled community-dwelling healthy cognitively normal elderly...
November 10, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/29124628/chronic-intermittent-hypoxia-exposure-induces-kidney-injury-in-growing-rats
#9
Neha-Devi Poonit, Yi-Chun Zhang, Chu-Yuan Ye, Hui-Lin Cai, Chen-Yi Yu, Ting Li, Xiao-Hong Cai
OBJECTIVE: The objectives of this paper are to examine the effect of chronic intermittent hypoxia (CIH) on the morphological changes in the kidney of growing rats and to explore the mechanisms underlying the CIH-induced renal damage. METHODS: Forty Sprague-Dawley rats were randomly divided into two groups: 2 and 4 weeks CIH groups (2IH, 4IH), and in the control group 2 and 4 weeks air-stimulated groups (2C, 4C), with 10 rats in each group. Pathological changes of renal tissue were observed by HE staining, PAS staining, and Masson staining...
November 9, 2017: Sleep & Breathing, Schlaf & Atmung
https://www.readbyqxmd.com/read/29108914/detection-and-analysis-of-apoptosis-and-autophagy-related-mirnas-of-mouse-vascular-endothelial-cells-in-chronic-intermittent-hypoxia-model
#10
Kai-Xiong Liu, Gong-Ping Chen, Ping-Li Lin, Jian-Chai Huang, Xin Lin, Jia-Chao Qi, Qi-Chang Lin
Endothelial dysfunction is the main pathogenic mechanism of cardiovascular complications induced by obstructive sleep apnea/hyponea syndrome (OSAHS). Chronic intermittent hypoxia (CIH) is the primary factor of OSAHS-associated endothelial dysfunction. The hypoxia inducible factor (HIF) pathway regulates the expression of downstream target genes and mediates cell apoptosis caused by CIH-induced endothelial injury. miRNAs play extensive and important negative regulatory roles in this process at the post-transcriptional level...
November 3, 2017: Life Sciences
https://www.readbyqxmd.com/read/29107469/diseases-of-the-retina-and-the-optic-nerve-associated-with-obstructive-sleep-apnea
#11
REVIEW
Marielle Mentek, Florent Aptel, Diane Godin-Ribuot, Renaud Tamisier, Jean-Louis Pepin, Christophe Chiquet
Many associations between ocular disorders and obstructive sleep apnea (OSA) have been studied, such as nonarteritic anterior ischemic optic neuropathy, glaucoma, papilledema, retinal vein occlusion, eyelid hyperlaxity, lower-eyelid ectropion and recurrent corneal erosions. The objective of this review is to synthetize the possible vascular disorders of the retina and the optic nerve associated with sleep apnea patients and to discuss the underlying pathophysiological hypotheses. Main mechanisms involved in the ocular complications of OSA are related to intermittent hypoxia, sympathetic system activation, oxidant stress, and deleterious effects of endothelin 1...
May 29, 2017: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/29107023/intermittent-hypoxia-alters-dose-dependent-caffeine-effects-on-renal-prostanoids-and-receptors-in-neonatal-rats
#12
Kay D Beharry, Charles L Cai, Kultida Soontarapornchai, Taimur Ahmad, Gloria B Valencia, Jacob V Aranda
Caffeine, one of the most commonly prescribed drugs in preterm neonates, is given in standard or suprapharmacologic doses. Although known as a diuretic, its effects in the neonatal kidneys are not well studied. We tested the hypothesis that neonatal intermittent hypoxia (IH) and high caffeine doses (HCD) alter renal regulators of vasomotor tone and water balance. Newborn rats were randomized to room air, hyperoxia, or IH and treated with standard or high caffeine doses; or placebo saline. Renal prostanoids; histopathology; and cyclooxygenase (COX), prostanoid receptor, and aquaporin (AQP) immunoreactivity were determined...
October 26, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/29101166/transcription-factor-%C3%AE-fosb-acts-within-the-nucleus-of-the-solitary-tract-to-increase-mean-arterial-pressure-during-exposures-to-intermittent-hypoxia
#13
Qiong Wu, J Thomas Cunningham, Steve W Mifflin
ΔFosB is a member of the AP-1 family of transcription factors. ΔFosB has low constitutive expression in the central nervous system and is induced following exposure of rodents to intermittent hypoxia (IH), a model of the arterial hypoxemia that accompanies sleep apnea. We hypothesize ΔFosB in the nucleus of solitary tract (NTS) contributes to increased mean arterial pressure (MAP) during IH. The NTS of 11 male Sprague Dawley rats was injected (3 sites, 100nl per site) with a dominant-negative against ΔFosB (ΔJunD) in an adeno-associated viral vector (AAV)-green fluorescent protein (GFP) reporter...
November 3, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29097171/the-impact-of-intermittent-or-sustained-carbon-dioxide-on-intermittent-hypoxia-initiated-respiratory-plasticity-what-is-the-effect-of-these-combined-stimuli-on-apnea-severity
#14
REVIEW
Jason H Mateika, Gino Panza, Raichel Alex, Mohamad El-Chami
The following review explores the effect that intermittent or sustained hypercapnia coupled to intermittent hypoxia has on respiratory plasticity. The review explores published work which suggests that intermittent hypercapnia leads to long-term depression of respiration when administered in isolation and prevents the initiation of long-term facilitation when administered in combination with intermittent hypoxia. The review also explores the impact that sustained hypercapnia alone and in combination with intermittent hypoxia has on the magnitude of long-term facilitation...
October 30, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29081358/spinal-activation-of-protein-kinase-c-elicits-phrenic-motor-facilitation
#15
Michael J Devinney, Gordon S Mitchell
The protein kinase C family regulates many cellular functions, including multiple forms of neuroplasticity. The novel PKCθ and atypical PKCζ isoforms have been implicated in distinct forms of spinal, respiratory motor plasticity, including phrenic motor facilitation (pMF) following acute intermittent hypoxia or inactivity, respectively. Although these PKC isoforms are critical in regulating spinal motor plasticity, other isoforms may be important for phrenic motor plasticity. We tested the impact of conventional/novel PKC activator, phorbol 12-myristate 13-acetate (PMA) on pMF...
November 2, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29077517/therapeutic-efficacy-of-methazolamide-against-intermittent-hypoxia-induced-excessive-erythrocytosis-in-rats
#16
Zhiqing Zhang, Zhonghai Xiao, Bingnan Deng, Xiaohua Liu, Wei Liu, Hongjing Nie, Xi Li, Zhaoli Chen, Danfeng Yang, Ruifeng Duan
Zhang, Zhiqing, Zhonghai Xiao, Bingnan Deng, Xiaohua Liu, Wei Liu, Hongjing Nie, Xi Li, Zhaoli Chen, Danfeng Yang, and Ruifeng Duan. Therapeutic efficacy of methazolamide against intermittent hypoxia-induced excessive erythrocytosis in rats. High Alt Med Biol 00:000-000, 2017.-This study aimed to determine whether methazolamide is effective for the treatment of chronic mountain sickness. Forty-eight male Wistar rats were randomly divided into eight groups: normoxia control, hypoxia control, hypoxia + acetazolamide (30 mg·kg(-1)·d(-1)), and five hypoxia + methazolamide groups (5, 10, 30, 90, and 120 mg·kg(-1)·d(-1))...
October 27, 2017: High Altitude Medicine & Biology
https://www.readbyqxmd.com/read/29074711/enhanced-cerebral-perfusion-during-brief-exposures-to-cyclic-intermittent-hypoxemia
#17
Xiaoli Liu, Diqun Xu, James R Hall, Sarah Ross, Shande Chen, Howe Liu, Robert T Mallet, Xiangrong Shi
Cerebral vasodilation and increased cerebral oxygen extraction help maintain cerebral oxygen uptake in the face of hypoxemia. This study examined cerebrovascular responses to intermittent hypoxemia in eight healthy men breathing 10% O2 for 5 cycles, each 6 min, interspersed with 4 min of room air breathing. Hypoxia exposures raised heart rate (P<0.01) without altering arterial pressure, and increased ventilation (P<0.01) by expanding tidal volume. Arterial oxygen saturation (SaO2) and cerebral tissue oxygenation (ScO2) fell (P<0...
October 26, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29074449/intermittent-but-not-sustained-moderate-hypoxia-elicits-long-term-facilitation-of-hypoglossal-motor-output
#18
Julia E R Wilkerson, Michael Devinney, Gordon S Mitchell
Phrenic long-term facilitation (pLTF) is a form of serotonin-dependent respiratory motor plasticity induced by moderate acute intermittent hypoxia (AIH), but not by moderate acute sustained hypoxia (ASH) of similar cumulative duration. Thus, moderate AIH-induced pLTF is sensitive to the pattern of hypoxia. On the other hand, pLTF induced by severe AIH protocols is neither pattern sensitive nor serotonin dependent (it converts to an adenosine-dependent mechanism). Although moderate AIH also induces hypoglossal LTF (hLTF), no data are available concerning its sensitivity/insensitivity to the pattern of hypoxia...
October 23, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29067957/hepatic-cyp1a2-expression-reduction-during-inflammation-elicited-in-a-rat-model-of-intermittent-hypoxia
#19
Li-Xia Shi, Xing Wang, Qi Wu, Xin Sun, Zhen Wan, Li Li, Kuan Li, Xue Li, Yu Li, Qiu-Yang Zhang, Jun-Ping Wu, Huai-Yong Chen
BACKGROUND: Intermittent hypoxia (IH) is a key element of obstructive sleep apnea (OSA) that can lead to disorders in the liver. In this study, IH was established in a rat model to examine its effects on the expression of hepatic cytochrome P450 (CYP) and CYP regulators, including nuclear receptors. METHODS: Hematoxylin and eosin staining was conducted to analyze the general pathology of the liver of rats exposed to IH. The messenger RNA (mRNA) expression levels of inflammatory cytokines, CYPs, nuclear factor-κB (NF-κB), and nuclear factors in the liver were measured by quantitative reverse transcription polymerase chain reaction...
November 5, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/29057883/non-muscular-myosin-light-chain-kinase-triggers-intermittent-hypoxia-induced-interleukin-6-release-endothelial-dysfunction-and-permeability
#20
Sylvain Recoquillon, Manuel Gómez-Guzmán, Marion Rodier, Camille Koffi, Mathieu Nitiéma, Frédéric Gagnadoux, M Carmen Martínez, Ramaroson Andriantsitohaina
Obstructive sleep apnea is characterized by intermittent hypoxia (IH) which alters endothelial function, induces inflammation and accelerates atherosclerosis-induced cardiovascular diseases. The non-muscular myosin light chain kinase (nmMLCK) isoform contributes to endothelial cell-cell junction opening. Deletion of nmMLCK protects mice from death in septic shock models and prevents atherosclerosis in high-fat diet-fed mice. The aim of the study was to analyze the implication of nmMLCK in IH-induced vascular inflammation...
October 20, 2017: Scientific Reports
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