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https://www.readbyqxmd.com/read/29785989/cerebral-visual-impairment-in-children-causes-and-associated-ophthalmological-problems
#1
Niranjan Pehere, Pratik Chougule, Gordon N Dutton
Purpose: The aim of this study is to identify common causes, associated ophthalmological abnormalities, and systemic comorbidities in children in Andhra Pradesh, India, with cerebral visual impairment (CVI). Methods: A retrospective review of case records of all children aged <16 years with diagnosis of CVI seen between January 2016 and December 2016 was carried out. Data were collected for their age, gender, cause of CVI, refraction, accommodation, anterior and posterior segment examination findings, and systemic problems...
June 2018: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29783851/the-death-debate-penumbra-conundrum
#2
Robert F Johnson
Determination and declaration of death by neurologic criteria, brain death, is an established and legally accepted clinical practice with profound implications. Concerns regarding the accuracy of this diagnosis raise important clinical, ethical, and legal issues. A recent magazine article highlights these concerns by describing a poignant example of a patient meeting accepted clinical and ancillary testing criteria for brain death in the setting of post cardiac arrest hypoxic ischemic encephalopathy (CA-HIE)...
January 1, 2018: American Journal of Hospice & Palliative Care
https://www.readbyqxmd.com/read/29778695/corticosteroids-and-perinatal-hypoxic-ischemic-brain-injury
#3
REVIEW
Katherine R Concepcion, Lubo Zhang
Perinatal hypoxic-ischemic (HI) brain injury is the major cause of neonatal mortality and severe long-term neurological morbidity. Yet, the effective therapeutic interventions currently available are extremely limited. Corticosteroids act on both mineralocorticoid (MR) and glucocorticoid (GR) receptors and modulate inflammation and apoptosis in the brain. Neuroinflammatory response to acute cerebral HI is a major contributor to the pathophysiology of perinatal brain injury. Here, we give an overview of current knowledge of corticosteroid-mediated modulations of inflammation and apoptosis in the neonatal brain, focusing on key regulatory cells of the innate and adaptive immune response...
May 17, 2018: Drug Discovery Today
https://www.readbyqxmd.com/read/29772244/gender-difference-in-the-effect-of-progesterone-on-neonatal-hypoxic-ischemic-brain-injury-in-mouse
#4
Shuyu Dong, Qian Zhang, Delian Kong, Chao Zhou, Jie Zhou, Jingjing Han, Yan Zhou, Guoliang Jin, Xiaodong Hua, Jun Wang, Fang Hua
This study was to investigate the effects of progesterone (PROG) on neonatal hypoxic/ischemic (NHI) brain injury, the differences in effects between genders, and the underlying mechanisms. NHI brain injury was established in both male and female neonatal mice induced by occlusion of the left common carotid artery followed by hypoxia. The mice were treated with PROG or vehicle. Fluoro-Jade B staining (F-JB), long term behavior testing, and brain magnetic resonance image (MRI) were applied to evaluate neuronal death, neurological function, and brain damage...
May 14, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29772235/autophagy-mediates-enhancement-of-proangiogenic-activity-by-hypoxia-in-mesenchymal-stromal-stem-cells
#5
Seul-Gi Lee, Young Ae Joe
Mesenchymal stromal/stem cells (MSCs) have been promising source for regenerative cell therapy in ischemic diseases. To improve efficacy of MSC therapy, various priming methods have been developed, and hypoxic priming has been reported to enhance therapeutic efficacy of MSCs by increasing secretion level of growth factors and cytokines. Recently, it has been reported that bone marrow MSCs primed with hypoxic condition show an increase of autophagy. Here, we addressed whether proangiogenic activity increased by hypoxic condition is associated with autophagy...
May 14, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29769612/hypothermia-broadens-the-therapeutic-time-window-of-mesenchymal-stem-cell-transplantation-for-severe-neonatal-hypoxic-ischemic-encephalopathy
#6
So Yoon Ahn, Yun Sil Chang, Dong Kyung Sung, Se In Sung, Won Soon Park
Recently, we have demonstrated that concurrent hypothermia and mesenchymal stem cells (MSCs) transplantation synergistically improved severe neonatal hypoxic ischemic encephalopathy (HIE). The current study was designed to determine whether hypothermia could extend the therapeutic time window of MSC transplantation for severe neonatal HIE. To induce HIE, newborn rat pups were exposed to 8% oxygen for 2 h following unilateral carotid artery ligation on postnatal day (P) 7. After approving severe HIE involving >50% of the ipsilateral hemisphere volume, hypothermia (32 °C) for 2 days was started...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29768254/neuroprotection-against-hypoxic-ischemic-injury-%C3%AE-opioid-receptors-and-bdnf-trkb-pathway
#7
Shiying Sheng, Jingzhong Huang, Yi Ren, Feng Zhi, Xuansong Tian, Guoqiang Wen, Guanghong Ding, Terry C Xia, Fei Hua, Ying Xia
The delta-opioid receptor (DOR) is one of three classic opioid receptors in the opioid system. It was traditionally thought to be primarily involved in modulating the transmission of messages along pain signaling pathway. Although there were scattered studies on its other neural functions, inconsistent results and contradicting conclusions were found in past literatures, especially in terms of DOR's role in a hypoxic/ischemic brain. Taking inspiration from the finding that the turtle brain exhibits a higher DOR density and greater tolerance to hypoxic/ischemic insult than the mammalian brain, we clarified DOR's specific role in the brain against hypoxic/ischemic injury and reconciled previous controversies in this aspect...
May 11, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29765933/a-pilot-study-of-inhaled-co-therapy-in-neonatal-hypoxia-ischemia-carboxyhemoglobin-concentrations-and-brain-volumes
#8
Martha Douglas-Escobar, Monique Mendes, Candace Rossignol, Nikolay Bliznyuk, Ariana Faraji, Abdullah S Ahmad, Sylvain Doré, Michael D Weiss
Objective: The objective of this pilot study was to start evaluating the efficacy and the safety (i.e., carboxyhemoglobin concentration of carbon monoxide (CO)) as a putative neuroprotective therapy in neonates. Study Design: Neonatal C57BL/6 mice were exposed to CO at a concentration of either 200 or 250 ppm for a period of 1 h. The pups were then sacrificed at 0, 10, 20, 60, 120, 180, and 240 min after exposure to either concentration of CO, and blood was collected for analysis of carboxyhemoglobin. Following the safety study, 7-day-old pups underwent a unilateral carotid ligation...
2018: Frontiers in Pediatrics
https://www.readbyqxmd.com/read/29764578/-protective-effect-of-astrocyte-exosomes-on-hypoxic-ischemic-neurons
#9
Jing-Lan Huang, Yi Qu, Jun Tang, Rong Zou, Shi-Ping Li, Ya-Fei Li, Li Zhang, Bin Xia, De-Zhi Mu
OBJECTIVE: To study the effect of astrocyte exosomes on hypoxic-ischemic neurons. METHODS: Rat astrocytes were cultured in vitro, and differential centrifugation was used to obtain the exosomes from the cell supernatant. Transmission electron microscopy, Nanosight, and Western blot were used for the identification of exosomes. BCA method was used to measure the concentration of exosomes. Rat neurons were cultured in vitro and then divided into control group, exosome group, oxygen glucose deprivation (OGD) group, and OGD+exosome group (n=3 each)...
May 2018: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/29760722/microrna-126-priming-enhances-functions-of-endothelial-progenitor-cells-under-physiological-and-hypoxic-conditions-and-their-therapeutic-efficacy-in-cerebral-ischemic-damage
#10
Qunwen Pan, Jieyi Zheng, Donghui Du, Xiaorong Liao, Chunlian Ma, Yi Yang, Yanyu Chen, Wangtao Zhong, Xiaotang Ma
Endothelial progenitor cells (EPCs) have shown the potential for treating ischemic stroke (IS), while microRNA-126 (miR-126) is reported to have beneficial effects on endothelial function and angiogenesis. In this study, we investigated the effects of miR-126 overexpression on EPCs and explore the efficacy of miR-126-primed EPCs (EPCmiR-126 ) in treating IS. The effects of miR-126 overexpression on EPC proliferation, migratory, tube formation capacity, reactive oxygen species (ROS) production, and nitric oxide (NO) generation were determined...
2018: Stem Cells International
https://www.readbyqxmd.com/read/29758244/neural-stem-cell-therapies-and-hypoxic-ischemic-brain-injury
#11
REVIEW
Lei Huang, Lubo Zhang
Hypoxic-ischemic brain injury is a significant cause of morbidity and mortality in the adult as well as in the neonate. Extensive pre-clinical studies have shown promising therapeutic effects of neural stem cell-based treatments for hypoxic-ischemic brain injury. There are two major strategies of neural stem cell-based therapies: transplanting exogenous neural stem cells and boosting self-repair of endogenous neural stem cells. Neural stem cell transplantation has been proved to improve functional recovery after brain injury through multiple by-stander mechanisms (e...
May 11, 2018: Progress in Neurobiology
https://www.readbyqxmd.com/read/29757724/neuroimaging-findings-of-organic-acidemias-and-aminoacidopathies
#12
Nihaal Reddy, Sonia F Calloni, Hilary J Vernon, Eugen Boltshauser, Thierry A G M Huisman, Bruno P Soares
Although individual cases of inherited metabolic disorders are rare, overall they account for a substantial number of disorders affecting the central nervous system. Organic acidemias and aminoacidopathies include a variety of inborn errors of metabolism that are caused by defects in the intermediary metabolic pathways of carbohydrates, amino acids, and fatty acid oxidation. These defects can lead to the abnormal accumulation of organic acids and amino acids in multiple organs, including the brain. Early diagnosis is mandatory to initiate therapy and prevent permanent long-term neurologic impairments or death...
May 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29755568/exosomes-secreted-by-normoxic-and-hypoxic-cardiosphere-derived-cells-have-anti-apoptotic-effect
#13
Helia Namazi, Iman Namazi, Parisa Ghiasi, Hassan Ansari, Sarah Rajabi, Ensiyeh Hajizadeh-Saffar, Nasser Aghdami, Elham Mohit
Cardiosphere-derived cells (CDCs) have emerged as one of the most promising stem cell types for cardiac protection and repair. Exosomes are required for the regenerative effects of human CDCs and mimic the cardioprotective benefits of CDCs such as anti-apoptotic effect in animal myocardial infarction (MI) models. Here we aimed to investigate the anti-apoptotic effect of the hypoxic and normoxic human CDCs-derived exosomes on induced apoptosis in human embryonic stem cell-derived cardiomyocytes (hESC-CMs). In this study, CDCs were cultured under normoxic (18% O2 ) and hypoxic (1% O2 ) conditions and CDC-exosomes were isolated from conditioned media by differential ultracentrifugation...
2018: Iranian Journal of Pharmaceutical Research: IJPR
https://www.readbyqxmd.com/read/29750885/severe-acute-heart-failure-experimental-model-with-very-low-mortality
#14
S Lacko, M Mlček, P Hála, M Popková, D Janák, M Hrachovina, J Kudlička, V Hrachovina, P Ošťádal, O Kittnar
The growth in the experimental research of facilities to support extracorporeal circulation requires the further development of models of acute heart failure that can be well controlled and reproduced. Two types of acute heart failure were examined in domestic pigs (Sus scrofa domestica): a hypoxic model (n = 5) with continuous perfusion of the left coronary artery by hypoxic deoxygenated blood and ischemic model (n = 9) with proximal closure of the left coronary artery and controlled hypoperfusion behind the closure...
May 10, 2018: Physiological Research
https://www.readbyqxmd.com/read/29750308/actinidia-chinensis-planch-polysaccharide-protects-against-hypoxia%C3%A2-induced-apoptosis-of-cardiomyocytes-in-vitro
#15
Qiang Wang, Yunfa Xu, Ying Gao, Qi Wang
Cardiac hypertrophy is frequently accompanied by ischemic heart disease. Actinidia chinensis planch polysaccharide (ACP) is the main active compound from Actinidia chinensis planch. In the present study, a cardiac hypertrophy model was produced by treating cells with Angiotensin II (Ang II), which was used to investigate whether ACP protected against cardiac hypertrophy in vitro. It was demonstrated that ACP alleviated Ang II‑induced cardiac hypertrophy. In addition, pretreatment with ACP prior to hypoxic culture reduced the disruption of the mitochondrial membrane potential as investigated by flow cytometry...
May 3, 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29747886/therapeutic-hypothermia-how-can-we-optimize-this-therapy-to-further-improve-outcomes
#16
REVIEW
Girija Natarajan, Abbot Laptook, Seetha Shankaran
Neonatal hypoxic-ischemic encephalopathy remains associated with considerable death and disability. In multiple randomized controlled trials, therapeutic hypothermia for neonatal moderate or severe hypoxic-ischemic encephalopathy among term infants has been shown to be safe and effective in reducing death and disability in survivors. In this article, the current status of infant and childhood outcomes following this therapy is reviewed. The clinical approaches that may help to optimize this innovative neuroprotective therapy are presented...
June 2018: Clinics in Perinatology
https://www.readbyqxmd.com/read/29741516/the-influence-of-anesthetics-on-substantia-nigra-tyrosine-hydroxylase-expression-and-tau-phosphorylation-in-the-hypoxic-ischemic-near-term-lamb
#17
Melinda Barkhuizen, Fleur J P van Dijck, Reint K Jellema, Ruth Gussenhoven, Imke Engelbertink, Ralph van Mechelen, Jack P M Cleutjens, Matthias Seehase, Harry W M Steinbusch, Luc J Zimmermann, A W Danilo Gavilanes, Boris W Kramer
BackgroundGeneral anesthetics could protect key neurotransmitter systems, such as the dopaminergic system, from hypoxic-ischemic encephalopathy (HIE) by limiting excessive glutamatergic neurotransmission. However, anesthetics may adversely affect inflammation and tau phosphorylation.MethodsA near-term sheep model of HIE by umbilical cord occlusion (UCO) under anesthesia was used. The effect of propofol and isoflurane on the dopaminergic neurotransmitter phenotype in the substantia nigra (SN) was studied using tyrosine hydroxylase immunohistochemistry...
May 9, 2018: Pediatric Research
https://www.readbyqxmd.com/read/29738858/neuroglobin-as-a-novel-biomarker-for-predicting-poor-outcomes-in-aneurysmal-subarachnoid-hemorrhage
#18
Hanpei Cai, Shufa Zheng, Bin Cai, Peisen Yao, Chenyu Ding, Fuxiang Chen, Dezhi Kang
OBJECTIVE: Neuroglobin (Ngb) has a high affinity for oxygen and helps prevent hypoxic-ischemic brain damage. In this paper, we analyzed the relationship between Ngb levels and clinical outcomes of aneurysmal subarachnoid hemorrhage (aSAH). METHODS: Serum Ngb levels were measured in 58 patients with aSAH and 27 controls using enzyme-linked immunosorbent assay. To continuously assess aSAH, we measured serum Ngb levels on days 1, 2, 3, 5 and 7 after aSAH. Clinical data were collected using the Hunt & Hess Scale, Glasgow Coma Scale (GCS), World Federation of Neurological Surgeons (WFNS) scale and modified Fisher scale...
May 5, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29737151/oxygen-releasing-antioxidant-cryogel-scaffolds-with-sustained-oxygen-delivery-for-tissue-engineering-applications
#19
Parvaiz Ahmad Shiekh, Anamika Singh, Ashok Kumar
With the advancement in biomaterial sciences, tissue engineered scaffolds are developing as a promising strategy for the regeneration of damaged tissues. However, only a few of these scaffolds have been translated into clinical applications. One of the primary drawbacks of the existing scaffolds is the lack of adequate oxygen supply within the scaffolds. Oxygen producing biomaterials have been developed as an alternate strategy but are faced with two major concerns. One is controlling the rate of oxygen generation, and the other is the production of reactive oxygen species...
May 8, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29733848/polyacetylene-glycoside-attenuates-ischemic-kidney-injury-by-co-inhibiting-inflammation-mitochondria-dysfunction-and-lipotoxicity
#20
Yijie Zhou, Dan Du, Shuyun Liu, Meng Zhao, Yujia Yuan, Lan Li, Younan Chen, Yanrong Lu, Jingqiu Cheng, Jingping Liu
AIMS: Ischemic acute kidney injury (AKI) is a serious clinical problem and no efficient therapeutics is available in clinic now. Natural polyacetylene glycosides (PGAs) had shown antioxidant and anti-inflammatory properties, but their effects on kidney injury have not been evaluated. This study aimed to investigate the protective effect of PGA on ischemic kidney injury in renal tubular epithelial cells (TECs) and mice. MAIN METHODS: Hypoxic HK-2 cells and renal ischemia/reperfusion injury (IRI) mice were treated with PGA from Coreopsis tinctoria, and the cell viability, renal function, apoptosis, inflammation, mitochondrial injury, lipids metabolism were analyzed...
May 4, 2018: Life Sciences
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