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Fetal hypoxic

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https://www.readbyqxmd.com/read/28504050/how-long-is-sufficient-for-optimal-neuroprotection-with-cerebral-cooling-after-ischemia-in-fetal-sheep
#1
Joanne O Davidson, Vittoria Draghi, Sean Whitham, Simerdeep K Dhillon, Guido Wassink, Laura Bennet, Alistair J Gunn
The optimal duration of mild "therapeutic" hypothermia for neonates with hypoxic-ischemic encephalopathy is surprisingly unclear. This study assessed the relative efficacy of cooling for 48 h versus 72 h. Fetal sheep (0.85 gestation) received sham ischemia (n = 9) or 30 min global cerebral ischemia followed by normothermia (n = 8) or delayed hypothermia from 3 h to 48 h (n = 8) or 72 h (n = 8). Ischemia was associated with profound loss of electroencephalogram (EEG) power, neurons in the cortex and hippocampus, and oligodendrocytes and myelin basic protein expression in the white matter, with increased Iba-1-positive microglia and proliferation...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28486599/antenatal-blockade-of-nmda-receptors-by-memantine-reduces-the-susceptibility-to-diabetes-induced-by-a-high-fat-diet-in-rats-with-intrauterine-growth-restriction
#2
Xiao-Ting Huang, Shao-Jie Yue, Chen Li, Jia Guo, Yan-Hong Huang, Jian-Zhong Han, Dan-Dan Feng, Zi-Qiang Luo
Intrauterine growth retardation (IUGR) is closely related to the later development of type 2 diabetes in adulthood. Excessive activation of glutamate receptors causes excitatory neurotoxicity, which is primarily mediated by N-methyl-D-aspartate receptors (NMDARs), resulting in neuronal injury or death. Inhibition of NMDARs enhances the GSIS and survival of islet cells in type 2 diabetic mouse and human islets. Here, we examined whether antenatal blockade of NMDARs by Memantine could decrease the risk of diabetes induced by a high-fat (HF) diet at adulthood in IUGR rats...
May 8, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28468567/expression-of-star-and-key-genes-regulating-cortisol-biosynthesis-in-near-term-ovine-fetal-adrenocortical-cells-effects-of-long-term-hypoxia
#3
Vladimir E Vargas, Dean A Myers, Kanchan M Kaushal, Charles A Ducsay
We previously demonstrated decreased expression of key genes regulating cortisol biosynthesis in long-term hypoxic (LTH) sheep fetal adrenals compared to controls. We also showed that inhibition of the extracellular signal-regulated kinases (ERKs) with the mitogen-activated protein kinase (MEK)/ERK inhibitor UO126 limited adrenocorticotropic (ACTH)-induced cortisol production in ovine fetal adrenocortical cells (FACs), suggesting a role for ERKs in cortisol synthesis. This study was designed to determine whether the previously observed decrease in LTH cytochrome P45011A1/cytochrome P450c17 (CYP11A1/CYP17) in adrenal glands was maintained in vitro, and whether ACTH alone with or without UO126 treatment had altered the expression of CYP11A1, CYP17, and steroidogenic acute regulatory protein (StAR) in control versus LTH FACs...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28467985/effects-of-antenatal-melatonin-treatment-on-the-cerebral-vasculature-in-an-ovine-model-of-fetal-growth-restriction
#4
Margie Castillo-Melendez, Tamara Yawno, Amy Sutherland, Graham Jenkin, Euan M Wallace, Suzanne L Miller
Chronic moderate hypoxia, such as occurs in fetal growth restriction (FGR) during gestation, compromises the blood-brain barrier (BBB) and results in structural abnormalities of the cerebral vasculature. We have previously determined the neuroprotective and antioxidant effects of maternal administration of melatonin (MLT) on growth-restricted newborn lambs. The potential of maternal MLT therapy for the treatment of cerebrovascular dysfunction-associated developmental hypoxia has also been demonstrated in newborn lambs...
May 4, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28459842/phosphorylated-stat5-directly-facilitates-parvovirus-b19-dna-replication-in-human-erythroid-progenitors-through-interaction-with-the-mcm-complex
#5
Safder S Ganaie, Wei Zou, Peng Xu, Xuefeng Deng, Steve Kleiboeker, Jianming Qiu
Productive infection of human parvovirus B19 (B19V) exhibits high tropism for burst forming unit erythroid (BFU-E) and colony forming unit erythroid (CFU-E) progenitor cells in human bone marrow and fetal liver. This exclusive restriction of the virus replication to human erythroid progenitor cells is partly due to the intracellular factors that are essential for viral DNA replication, including erythropoietin signaling. Efficient B19V replication also requires hypoxic conditions, which upregulate the signal transducer and activator of transcription 5 (STAT5) pathway, and phosphorylated STAT5 is essential for virus replication...
May 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28435983/-effect-of-high-altitude-hypoxia-on-fetal-development-during-pregnancy-and-the-reason-analysis
#6
Juan-Li Liu, Si-Qing Ma, Ta-Na Wuren
High altitude hypoxia is an important factor to affect fetal development during pregnancy. In the special environment, maternal physiological functions are regulated to maintain the maternal and fetal homeostasis, so that limited oxygen is to meet the needs of fetal growth and development. In this review, the literatures about the effects of hypoxic environment on fetal development during pregnancy in recent years were summarized, in which the fetal growth characteristics, maternal physiological regulation, genetic and placental influencing factors in high altitude areas were involved...
April 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/28402971/implicating-receptor-activator-of-nf-%C3%AE%C2%BAb-rank-rank-ligand-signalling-in-microglial-responses-to-toll-like-receptor-stimuli
#7
Anton Kichev, Pascale Eede, Pierre Gressens, Claire Thornton, Henrik Hagberg
Inflammation in the perinatal brain caused by maternal or intrauterine fetal infection is now well established as an important contributor to the development of perinatal brain injury. Exposure to inflammatory products can impair perinatal brain development and act as a risk factor for neurological dysfunction, cognitive disorders, cerebral palsy, or preterm birth. Pre-exposure to inflammation significantly exacerbates brain injury caused by hypoxic/ischaemic insult. Tumour necrosis factor (TNF) is a family of cytokines largely involved in inflammation signalling...
April 13, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28395175/oxygen-and-oxidative-stress-in-the-perinatal-period
#8
REVIEW
Isabel Torres-Cuevas, Anna Parra-Llorca, Angel Sánchez-Illana, Antonio Nuñez-Ramiro, Julia Kuligowski, Consuelo Cháfer-Pericás, María Cernada, Justo Escobar, Máximo Vento
Fetal life evolves in a hypoxic environment. Changes in the oxygen content in utero caused by conditions such as pre-eclampsia or type I diabetes or by oxygen supplementation to the mother lead to increased free radical production and correlate with perinatal outcomes. In the fetal-to-neonatal transition asphyxia is characterized by intermittent periods of hypoxia ischemia that may evolve to hypoxic ischemic encephalopathy associated with neurocognitive, motor, and neurosensorial impairment. Free radicals generated upon reoxygenation may notably increase brain damage...
March 12, 2017: Redox Biology
https://www.readbyqxmd.com/read/28376077/maternal-nutrient-restriction-in-guinea-pigs-leads-to-fetal-growth-restriction-with-evidence-for-chronic-hypoxia
#9
Alexander A Elias, Yohei Maki, Brad Matushewski, Karen Nygard, Timothy R H Regnault, Bryan S Richardson
BACKGROUND: We determined if maternal nutrient restriction (MNR) in guinea pigs leading to fetal growth restriction (FGR), impacts markers for tissue hypoxia implicating a mechanistic role for chronic hypoxia. METHODS: Guinea pigs were fed ad libitum (Control) or 70% of the control diet pre-pregnant switching to 90% at mid-pregnancy (MNR). Near term, Hypoxyprobe-1 (HP-1), a marker of tissue hypoxia, was injected into pregnant sows. Fetuses were then necropsied and liver, kidney and placental tissues were processed for erythropoietin (EPO), EPO-receptor (EPOR), and VEGF protein levels, and for HP-1 immunoreactivity (IR)...
April 4, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28349526/pushing-bearing-down-methods-for-the-second-stage-of-labour
#10
REVIEW
Andrea Lemos, Melania Mr Amorim, Armele Dornelas de Andrade, Ariani I de Souza, José Eulálio Cabral Filho, Jailson B Correia
BACKGROUND: Maternal pushing during the second stage of labour is an important and indispensable contributor to the involuntary expulsive force developed by uterine contraction. There is no consensus on an ideal strategy to facilitate these expulsive efforts and there are contradictory results about the influence on the mother and fetus. OBJECTIVES: To evaluate the benefits and possible disadvantages of different kinds of techniques regarding maternal pushing/breathing during the expulsive stage of labour on maternal and fetal outcomes...
March 26, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28343228/focal-brain-injury-associated-with-a-model-of-severe-hypoxic-ischemic-encephalopathy-in-nonhuman-primates
#11
Ryan M McAdams, Ronald J McPherson, Raj P Kapur, Sandra E Juul
Worldwide, hypoxic-ischemic encephalopathy (HIE) is a major cause of neonatal mortality and morbidity. To better understand the mechanisms contributing to brain injury and improve outcomes in neonates with HIE, better preclinical animal models that mimic the clinical situation following birth asphyxia in term newborns are needed. In an effort to achieve this goal, we modified our nonhuman primate model of HIE induced by in utero umbilical cord occlusion (UCO) to include postnatal hypoxic episodes, in order to simulate apneic events in human neonates with HIE...
March 25, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28338216/the-diversified-function-and-potential-therapy-of-ectopic-olfactory-receptors-in-non-olfactory-tissues
#12
Zhe Chen, Hong Zhao, Nian Fu, Linxi Chen
Olfactory receptors (ORs) are mainly distributed in olfactory neurons and play a key role in detecting volatile odorants, eventually resulting in the production of smell perception. Recently, it is also reported that ORs are expressed in non-olfactory tissues including heart, lung, sperm, skin, and cancerous tissues. Interestingly, ectopic ORs are associated with the development of diseases in non-olfactory tissues. For instance, ectopic ORs initiate the hypoxic ventilatory responses and maintain the oxygen homeostasis of breathing in the carotid body when oxygen levels decline...
March 24, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28273661/early-versus-late-onset-fetal-growth-restriction-differentially-affects-the-development-of-the-fetal-sheep-brain
#13
Anna Karynna Alves de Alencar Rocha, Beth J Allison, Tamara Yawno, Graeme R Polglase, Amy E Sutherland, Atul Malhotra, Graham Jenkin, Margie Castillo-Melendez, Suzanne L Miller
Fetal growth restriction (FGR) is a common complication of pregnancy, principally caused by suboptimal placental function, and is associated with high rates of perinatal mortality and morbidity. Clinical studies suggest that the time of onset of placental insufficiency is an important contributor towards the neurodevelopmental impairments that are evident in children who had FGR. It is however currently unknown how early-onset and late-onset FGR differentially affect brain development. The aim of this study was to examine neuropathology in early-onset and late-onset FGR fetal sheep and to determine whether they differentially alter brain development...
March 9, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28270884/critical-imperative-for-the-reform-of-british-interpretation-of-fetal-heart-rate-decelerations-analysis-of-figo-and-nice-guidelines-post-truth-foundations-cognitive-fallacies-myths-and-occam-s-razor
#14
REVIEW
Shashikant L Sholapurkar
Cardiotocography (CTG) has disappointingly failed to show good predictability for fetal acidemia or neonatal outcomes in several large studies. A complete rethink of CTG interpretation will not be out of place. Fetal heart rate (FHR) decelerations are the most common deviations, benign as well as manifestation of impending fetal hypoxemia/acidemia, much more commonly than FHR baseline or variability. Their specific nomenclature is important (center-stage) because it provides the basic concepts and framework on which the complex "pattern recognition" of CTG interpretation by clinicians depends...
April 2017: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/28268486/identifying-stereotypic-evolving-micro-scale-seizures-sems-in-the-hypoxic-ischemic-eeg-of-the-pre-term-fetal-sheep-with-a-wavelet-type-ii-fuzzy-classifier
#15
Hamid Abbasi, Laura Bennet, Alistair J Gunn, Charles P Unsworth
Perinatal hypoxic-ischemic encephalopathy (HIE) around the time of birth due to lack of oxygen can lead to debilitating neurological conditions such as epilepsy and cerebral palsy. Experimental data have shown that brain injury evolves over time, but during the first 6-8 hours after HIE the brain has recovered oxidative metabolism in a latent phase, and brain injury is reversible. Treatments such as therapeutic cerebral hypothermia (brain cooling) are effective when started during the latent phase, and continued for several days...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268471/examining-the-effect-of-mgso4-on-sharp-wave-transient-activity-in-the-hypoxic-ischemic-fetal-sheep-model
#16
Meherzad J Lakadia, Hamid Abbasi, Alistair J Gunn, Charles P Unsworth, Laura Bennet
Hypoxic-ischemic encephalopathy (HIE) due to lack of oxygen is a debilitating disorder experienced by a significant number of preterm infants during birth. Studies show that the brain undergoes different phases of injury following hypoxic insult, but the first 6-8 hours (known as a latent phase) are the key to treatment efficacy. Cerebral hypothermia is one known treatment, and for it to be effective it must be started during the latent phase and continued for several days. In order to determine the effectiveness of treatment it is important to pinpoint the time of insult...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28259998/enhanced-expression-of-pkm2-associates-with-the-biological-properties-of-cancer-stem-cells-from-a549-human-lung-cancer-cells
#17
Chang-Ying Guo, Chen Yan, Lan Luo, Shinji Goto, Yoshishige Urata, Jian-Jun Xu, Xiao-Ming Wen, Yu-Kang Kuang, Fang-Fang Tou, Tao-Sheng Li
Cancer cells express the M2 isoform of glycolytic enzyme pyruvate kinase (PKM2) for favoring the survival under a hypoxic condition. Considering the relative low oxygen microenvironment in stem cell niche, we hypothesized that an enhanced PKM2 expression associates with the biological properties of cancer stem cells. We used A549 human lung cancer cell line and surgical resected lung cancer tissue samples from patients for experiments. We confirmed the co-localization of PKM2 and CD44, a popular marker for cancer stem cells in lung cancer tissue samples from patients...
April 2017: Oncology Reports
https://www.readbyqxmd.com/read/28226660/identifying-stereotypic-evolving-micro-scale-seizures-sems-in-the-hypoxic-ischemic-eeg-of-the-pre-term-fetal-sheep-with-a-wavelet-type-ii-fuzzy-classifier
#18
Hamid Abbasi, Laura Bennet, Alistair J Gunn, Charles P Unsworth, Hamid Abbasi, Laura Bennet, Alistair J Gunn, Charles P Unsworth, Charles P Unsworth, Laura Bennet, Hamid Abbasi, Alistair J Gunn
Perinatal hypoxic-ischemic encephalopathy (HIE) around the time of birth due to lack of oxygen can lead to debilitating neurological conditions such as epilepsy and cerebral palsy. Experimental data have shown that brain injury evolves over time, but during the first 6-8 hours after HIE the brain has recovered oxidative metabolism in a latent phase, and brain injury is reversible. Treatments such as therapeutic cerebral hypothermia (brain cooling) are effective when started during the latent phase, and continued for several days...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226644/examining-the-effect-of-mgso4-on-sharp-wave-transient-activity-in-the-hypoxic-ischemic-fetal-sheep-model
#19
Meherzad J Lakadia, Hamid Abbasi, Alistair J Gunn, Charles P Unsworth, Laura Bennet, Meherzad J Lakadia, Hamid Abbasi, Alistair J Gunn, Charles P Unsworth, Laura Bennet, Laura Bennet, Hamid Abbasi, Alistair J Gunn, Meherzad J Lakadia, Charles P Unsworth
Hypoxic-ischemic encephalopathy (HIE) due to lack of oxygen is a debilitating disorder experienced by a significant number of preterm infants during birth. Studies show that the brain undergoes different phases of injury following hypoxic insult, but the first 6-8 hours (known as a latent phase) are the key to treatment efficacy. Cerebral hypothermia is one known treatment, and for it to be effective it must be started during the latent phase and continued for several days. In order to determine the effectiveness of treatment it is important to pinpoint the time of insult...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28205096/pharmacological-effects-of-asiatic-acid-in-glioblastoma-cells-under-hypoxia
#20
Flourina Kumar Thakor, Ka-Wai Wan, Philip John Welsby, Gail Welsby
Glioblastoma multiforme is the most common and malignant primary brain tumor in adults. Despite current treatment options including surgery followed by radiation and chemotherapy with temozolomide and cisplatin, the median survival rate remains low (<16 months). Combined with increasing drug resistance and the inability of some compounds to cross the blood-brain barrier, novel compounds are being sought for the treatment of this disease. Here, we aimed to examine the pharmacological effect of Asiatic acid (AA) in glioblastoma under hypoxia...
February 15, 2017: Molecular and Cellular Biochemistry
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