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Hypoxic ischemic injury

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https://www.readbyqxmd.com/read/29164084/pretreatment-with-human-chorionic-gonadotropin-protects-the-neonatal-brain-against-the-effects-of-hypoxic-ischemic-injury
#1
Tammy Z Movsas, Rebecca L Weiner, M Banks Greenberg, David M Holtzman, Rafael Galindo
Introduction: Though the human fetus is exposed to placentally derived human chorionic gonadotropin (hCG) throughout gestation, the role of hCG on the fetal brain is unknown. Review of the available literature appears to indicate that groups of women with higher mean levels of hCG during pregnancy tend to have offspring with lower cerebral palsy (CP) risk. Given that newborn cerebral injury often precedes the development of CP, we aimed to determine whether hCG may protect against the neurodegenerative effects of neonatal brain injury...
2017: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29155421/characterization-of-neural-stem-cells-modified-with-hypoxia-neuron-specific-vegf-expression-system-for-spinal-cord-injury
#2
Y Yun, J Oh, Y Kim, G Kim, M Lee, Y Ha
Spinal cord injury (SCI) is an incurable disease causing an ischemic environment and functional defect, thus a new therapeutic approach is needed for SCI treatment. Vascular endothelial growth factor (VEGF) is a potent therapeutic gene to treat SCI via angiogenesis and neuroprotection, and both tissue-specific gene expression and high gene delivery efficiency are important for successful gene therapy. Here we design the hypoxia/neuron dual-specific gene expression system (pEpo-NSE) and efficient gene delivery platform can be achieved by the combination ex vivo gene therapy with erythropoietin (Epo) enhancer, neuron-specific enolase (NSE) promoter and neural stem cells (NSCs)...
November 20, 2017: Gene Therapy
https://www.readbyqxmd.com/read/29138854/ng25-an-inhibitor-of-transforming-growth-factor%C3%A2-%C3%AE-%C3%A2-activated-kinase-1-ameliorates-neuronal-apoptosis-in-neonatal-hypoxic%C3%A2-ischemic-rats
#3
Hua Wang, Zhong Chen, Yu Li, Qiaoyun Ji
Transforming growth factor (TGF)‑β‑activated kinase 1 (TAK1) was found to be activated by TGF‑β and acts as a central regulator of cell death in various types of disease. However, the expression and function of TAK1 in the neonatal brain following hypoxia‑ischemia (HI) remains unclear. In the present study, western blotting and immunofluorescence were employed to determine the expression and distribution of TAK1 in the brain cortex of a perinatal HI rat model. In addition, the specific inhibitor of TAK1, NG25 was administered via intracerebroventricular injection, prior to insult of the neonatal rat brains, for neuroprotection...
November 10, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29138115/active-forms-of-akt-and-erk-are-dominant-in-the-cerebral-cortex-of-newborn-pigs-that-are-unaffected-by-asphyxia
#4
Viktória Kovács, Valéria Tóth-Szűki, János Németh, Viktória Varga, Gábor Remzső, Ferenc Domoki
AIMS: Perinatal asphyxia (PA) often results in hypoxic-ischemic encephalopathy (HIE) in term neonates. Introduction of therapeutic hypothermia improved HIE outcome, but further neuroprotective therapies are still warranted. The present study sought to determine the feasibility of the activation of the cytoprotective PI-3-K/Akt and the MAPK/ERK signaling pathways in the subacute phase of HIE development in a translational newborn pig PA/HIE model. MAIN METHODS: Phosphorylated and total levels of Akt and ERK were determined by Western blotting in brain samples obtained from untreated naive, time control, and PA/HIE animals at 24-48h survival (n=3-3-6,respectively)...
November 11, 2017: Life Sciences
https://www.readbyqxmd.com/read/29137009/brain-metabolism-in-patients-with-freezing-of-gait-after-hypoxic-ischemic-brain-injury-a-pilot-study
#5
Seo Yeon Yoon, Sang Chul Lee, Na Young Kim, Young-Sil An, Yong Wook Kim
Movement disorders are 1 of the long-term neurological complications that can occur after hypoxic-ischemic brain injury (HIBI). However, freezing of gait (FOG) after HIBI is rare. The aim of this study was to examine the brain metabolism of patients with FOG after HIBI using F-18 fluoro-2-deoxy-D-glucose positron emission tomography (F-18 FDG PET).We consecutively enrolled 11 patients with FOG after HIBI. The patients' overall brain metabolism was measured by F-18 FDG PET, and we compared their regional brain metabolic activity with that from 15 healthy controls using a voxel-by-voxel-based statistical mapping analysis...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29125039/astrocyte-autophagy-flux-protects-neurons-against-oxygen-glucose-deprivation-and-ischemic-reperfusion-injury
#6
Xue Liu, Fengfeng Tian, Shiquan Wang, Feng Wang, Lize Xiong
The role of autophagy varies with the type of acute brain injury. In general, autophagy mediates a clear neuroprotective effect in intoxication caused by various psychoactive agents, subarachnoid hemorrhage and spinal cord injury. In contrast, autophagic cell death has also been reported to actively contribute to neuronal loss in neonatal hypoxic ischemic encephalopathy. However, it still remains to be determined whether autophagy pays a cytoprotective or a cytotoxic role in stroke. Previous studies focused primarily on the role of neurons rather than the role of astrocytes in brain injury...
November 10, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/29119398/myocardial-protection-against-ischemic-and-reperfusion-injuries-experimental-study
#7
I A Mandel', A Yu Podoksenov, I V Sukhodolo, Yu K Podoksenov, Yu S Svirko, N O Kamenshchikov, S L Mikheev, A S Sementsov, Yu V Rogovskaya, D A An, V M Shipulin, L N Maslov
The effects of hypoxic, hyperoxic, and hypoxic-hyperoxic preconditioning were examined in the prospective study on narcotized and artificially ventilated rabbits. Under artificial circulation, acute myocardial ischemia was modeled by ligation of anterior descending coronary artery, which was followed by reperfusion. The degree of ventricular arrhythmias was assessed, and the ischemic area was evaluated in percent of the area at risk. Microscopic characterization of the myocardium was employed to assess the cardioprotective effect of hypoxic and/or hyperoxic preconditioning...
November 9, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29113299/microrna-210-suppresses-glucocorticoid-receptor-expression-in-response-to-hypoxia-in-fetal-rat-cardiomyocytes
#8
Shannalee R Martinez, Qingyi Ma, Chiranjib Dasgupta, Xianmei Meng, Lubo Zhang
Hypoxia is a common intrauterine stressor, often resulting in intrauterine growth restriction and increased risk for cardiovascular disease later in life. The aim of this work was to test the hypothesis that microRNA-210 (miR-210) mediates the detrimental suppression of glucocorticoid receptor (GR) in response to hypoxia in fetal rat cardiomyocytes. Cardiomyocytes isolated from gestational day 21 Sprague Dawley fetal rats showed increased miR-210 levels and reduced GR abundance after exposure to ex vivo hypoxia (1% O2)...
October 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/29111451/brain-immune-interactions-in-perinatal-hypoxic-ischemic-brain-injury
#9
REVIEW
Bo Li, Katherine Concepcion, Xianmei Meng, Lubo Zhang
Perinatal hypoxia-ischemia remains the primary cause of acute neonatal brain injury, leading to a high mortality rate and long-term neurological deficits, such as behavioral, social, attentional, cognitive and functional motor deficits. An ever-increasing body of evidence shows that the immune response to acute cerebral hypoxia-ischemia is a major contributor to the pathophysiology of neonatal brain injury. Hypoxia-ischemia provokes an intravascular inflammatory cascade that is further augmented by the activation of resident immune cells and the cerebral infiltration of peripheral immune cells response to cellular damages in the brain parenchyma...
October 27, 2017: Progress in Neurobiology
https://www.readbyqxmd.com/read/29105819/neuroprotective-effect-of-licochalcone-a-against-oxygen-glucose-deprivation-reperfusion-in-rat-primary-cortical-neurons-by-attenuating-oxidative-stress-injury-and-inflammatory-response-via-the-sirt1-nrf2-pathway
#10
Xiaohong Liu, Ying Ma, Xiaodi Wei, Ting Fan
Perinatal hypoxic-ischemic encephalopathy (HIE) is a leading cause of neonatal death and neurological disability. Oxidative stress and neuroinflammation are typical pathogenic factors of HIE. Licochalcone A (LCA) exerts various biological properties, including anti-inflammatory and antioxidant activities. However, no data have been reported to elucidate the role of LCA in the development of HIE. In the present study, primary cultured rat cortical neurons were exposed to oxygen-glucose deprivation/reoxygenation (OGD/R) in vitro to simulate the in vivo situation of neonatal HIE...
November 6, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29098065/brain-injury-due-to-mechanical-trauma-and-ischemic-hypoxic-insult-biomarkers-of-brain-injury-and-oxidative-stress
#11
EDITORIAL
Margherita Neri, Andreas Büttner, Vittorio Fineschi
No abstract text is available yet for this article.
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29097777/low-dose-nitrite-improves-reoxygenation-following-renal-ischemia-in-rats
#12
Kathleen Cantow, Bert Flemming, Mechthild Ladwig-Wiegard, Pontus B Persson, Erdmann Seeliger
In hypoxic and acidic tissue environments, nitrite is metabolised to nitric oxide, thus, bringing about novel therapeutic options in myocardial infarction, peripheral artery disease, stroke, and hypertension. Following renal ischemia, reperfusion of the kidney remains incomplete and tissue oxygenation is reduced for several minutes to hours. Thus, in renal ischemia-reperfusion injury, providing nitrite may have outstanding therapeutic value. Here we demonstrate nitrite's distinct potential to rapidly restore tissue oxygenation in the renal cortex and medulla after 45 minutes of complete unilateral kidney ischemia in the rat...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29095291/relevance-of-urinary-s100b-protein-levels-as-a-short-term-prognostic-biomarker-in-asphyxiated-infants-treated-with-hypothermia
#13
Ayham Alshweki, Alejandro Pérez-Muñuzuri, Olalla López-Suárez, Ana Baña, Maria L Couce
The initial diagnosis of neonatal hypoxic-ischemic encephalopathy is based on nervous system clinical manifestations. The use of biomarkers to monitor brain injury and evaluate neuroprotective effects allows early intervention and treatment. This study was designed to determine the short-term prognostic significance of urinary S100B calcium-binding protein (S100B) in asphyxiated newborns treated with hypothermia.An observational prospective study was conducted over a period of 5 years in 31 newborns with hypoxic-ischemic encephalopathy who received therapeutic hypothermia...
November 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29079121/alterations-in-inter-alpha-inhibitor-protein-expression-after-hypoxic-ischemic-brain-injury-in-neonatal-rats
#14
Clémence Disdier, Jiyong Zhang, Yuki Fukunaga, Yow-Pin Lim, Joseph Qiu, Andre Santoso, Barbara S Stonestreet
Hypoxic-ischemic (HI) brain injury is frequently associated with premature and/or full-term birth-related complications that reflect widespread damage to cerebral cortical structures. Inflammation has been implicated in the long-term evolution and severity of HI brain injury. Inter-Alpha Inhibitor Proteins (IAIPs) are immune modulator proteins that are reduced in systemic neonatal inflammatory states. We have shown that endogenous IAIPs are present in neurons, astrocytes and microglia and that exogenous treatment with human plasma purified IAIPs decreases neuronal injury and improves behavioral outcomes in neonatal rats with HI brain injury...
October 25, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/29077163/erythropoietin-reduces-hippocampus-injury-in-neonatal-rats-with-hypoxic-ischemic-brain-damage-via-targeting-matrix-metalloprotein-2
#15
L Zhang, L Wang, F-B Ning, T Wang, Y-C Liang, Y-L Liu
OBJECTIVE: Erythropoietin (EPO), as a type of the tissue-protective cytokines, is a 30.4 kDa hematopoietic glycoprotein. The purpose of this study was to explore the neuroprotective effects of EPO on the neonatal hypoxic-ischemic-induced hippocampus injury and the MMP-2 expression. MATERIALS AND METHODS: Neonatal Sprague-Dawley (SD) rats were randomly divided into an untreated group (control) and two hypoxia-ischemia (HI) groups treated with saline control or EPO...
October 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29067112/bone-marrow-mesenchymal-stem-cells-repair-the-hippocampal-neurons-and-increase-the-expression-of-igf-1-after-cardiac-arrest-in-rats
#16
Xiahong Tang, Feng Chen, Qinming Lin, Yan You, Jun Ke, Shen Zhao
The present study aimed to investigate the beneficial effects and underlying mechanisms of bone marrow mesenchymal stem cells (BMSCs) on global ischemic hypoxic brain injury. Cells collected from the femurs and tibias of male Sprague Dawley rats were used to generate BMSCs following three culture passages. A rate model of cardiac arrest (CA) was induced by asphyxia. One hour following return of spontaneous circulation (ROSC), BMSCs were transplanted through injection into the tail vein. Neurological status was assessed using modified neurological severity score (mNSS) tests 1, 3 and 7 days following ROSC...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29061152/individualized-perfusion-targets-in-hypoxic-ischemic-brain-injury-after-cardiac-arrest
#17
Mypinder S Sekhon, Donald E Griesdale
Secondary injury is a major determinant of outcome in hypoxic ischemic brain injury (HIBI) after cardiac arrest and may be mitigated by optimizing cerebral oxygen delivery (CDO2). CDO2 is determined by cerebral blood flow (CBF), which is dependent upon mean arterial pressure (MAP). In health, CBF remains constant over the MAP range through cerebral autoregulation. In HIBI, the zone of intact cerebral autoregulation is narrowed and varies for each patient. Maintaining MAP within the intact autoregulation zone may mitigate ischemia, hyperemia and secondary injury...
October 24, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29057537/cpg-oligodeoxynucleotide-preconditioning-improves-cardiac-function-after-myocardial-infarction-via-modulation-of-energy-metabolism-and-angiogenesis
#18
Deng-Cheng Zhou, Yong-Hui Su, Fu-Qing Jiang, Jing-Bo Xia, Hai-Yan Wu, Zao-Shang Chang, Wen-Tao Peng, Guo-Hua Song, Kyu-Sang Park, Soo-Ki Kim, Dong-Qing Cai, Li Zheng, Xu-Feng Qi
Unmethylated CpG oligodeoxynucleotide (CpG-ODN), a Toll-like receptor 9 (TLR9) ligand, has been shown to protect against myocardial ischemia/reperfusion injury. However, the potential effects of CpG-ODN on myocardial infarction (MI) induced by persistent ischemia remains unclear. Here, we investigated whether and how CpG-ODN preconditioning protects against MI in mice. C57BL/6 mice were treated with CpG-ODN by i.p. injection 2 hours prior to MI induction, and cardiac function and histology were analyzed two weeks after MI...
October 23, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29054697/a-novel-method-for-oxygen-glucose-deprivation-model-in-organotypic-spinal-cord-slices
#19
Jing-Jie Liu, Xiao-Yan Ding, Li Xiang, Feng Zhao, Sheng-Li Huang
This study aimed to establish a model to closely mimic spinal cord hypoxic-ischemic injury with high production and high reproducibility. Fourteen-day cultured organotypic spinal cord slices were divided into 4 groups: control (Ctrl), oxygen glucose deprived for 30min (OGD 30min), OGD 60min, and OGD 120min. The Ctrl slices were incubated with 1ml propidium iodide (PI) solution (5μg/ml) for 30min. The OGD groups were incubated with 1ml glucose-free DMEM/F12 medium and 5μl PI solution (1mg/ml) for 30min, 60min and 120min, respectively...
October 17, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/29053702/the-effects-of-adding-prophylactic-phenobarbital-to-therapeutic-hypothermia-in-the-term-equivalent-hypoxic-ischemic-rat
#20
Sushma Krishna, Alexandra Hutton, Eric Aronowitz, Holly Moore, Susan J Vannucci
BackgroundHypoxic-ischemic encephalopathy (HIE) is a major cause of neonatal morbidity and mortality. Therapeutic hypothermia (TH) is the only available intervention, but neuroprotection is incomplete and variable. Seizures are common in infants with HIE undergoing TH and may worsen outcome. Phenobarbital is sometimes added, although use of prophylactic phenobarbital is controversial in the neonate. We hypothesize that prophylactic phenobarbital (PB) will not reduce, and may enhance, the neuroprotective effects of TH on brain injury and motor outcomes in the postnatal-day 10 (P10) hypoxic-ischemic (HI) rat...
October 20, 2017: Pediatric Research
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