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perinatal hypoxia

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https://www.readbyqxmd.com/read/29453493/altered-prepulse-inhibition-of-the-acoustic-startle-response-in-bdnf-deficient-mice-in-a-model-of-early-postnatal-hypoxia-implications-for-schizophrenia
#1
Juan M Lima-Ojeda, Anne S Mallien, Christiane Brandwein, Undine E Lang, Dimitri Hefter, Dragos Inta
The brain-derived neurotrophic factor (BDNF) is a major proliferative agent in the nervous system. Both BDNF-deficiency and perinatal hypoxia represent genetic/environmental risk factors for schizophrenia. Moreover, a decreased BDNF response to birth hypoxia was associated with the disease. BDNF expression is influenced by neuronal activity and environmental conditions such as hypoxia. Thus, it may partake in neuroprotective and reparative mechanisms in acute or chronic neuronal insults. However, the interaction of hypoxia and BDNF is insufficiently understood and the behavioral outcome unknown...
February 16, 2018: European Archives of Psychiatry and Clinical Neuroscience
https://www.readbyqxmd.com/read/29406989/excessive-fetal-movements-are-a-sign-of-fetal-compromise-which-merits-further-examination
#2
Alexander E P Heazell, Tomasina Stacey, Louise M O'Brien, Edwin A Mitchell, Jane Warland
Changes in fetal movement are associated with increased risk of stillbirth after 28 weeks of pregnancy. The majority of studies have focussed on maternal perception of reduced fetal movements, which is associated with stillbirth via placental dysfunction. Recent studies have also described an association between a single episode of excessive fetal movements and late stillbirth. We present a hypothesis that a sudden episode of excessive fetal activity indicates fetal compromise relating to underlying disturbance of the in utero environment, which if it persists can lead to fetal death...
February 2018: Medical Hypotheses
https://www.readbyqxmd.com/read/29355822/mild-prenatal-hypoxia-ischemia-leads-to-social-deficits-and-central-and-peripheral-inflammation-in-exposed-offspring
#3
David J O ' Driscoll, Valeria D Felice, Louise C Kenny, Geraldine B Boylan, Gerard W O'Keeffe
Hypoxic-ischemic encephalopathy (HIE) resulting from intrauterine or perinatal hypoxic-ischemia (HI) is a leading cause of long-term neonatal neurodisability. While most studies of long-term outcome have focused on moderate and severe HIE in term infants, recent work has shown that those with mild HIE may have subtle neurological impairments. However, the impact of mild HI on pre-term infants is much less clear given that pre-term birth is itself a risk factor for neurodisability. Here we show that mild HI insult alters behaviour, inflammation and the corticosterone stress response in a rat model of pre-term HIE...
January 16, 2018: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29355709/magnesium-sulphate-induces-preconditioning-in-preterm-rodent-models-of-cerebral-hypoxia-ischemia
#4
Gabriella Koning, Ellinor Lyngfelt, Pernilla Svedin, Anna-Lena Leverin, Masako Jinnai, Pierre Gressens, Claire Thornton, Xiaoyang Wang, Carina Mallard, Henrik Hagberg
BACKGROUND: Brain injury in preterm infants represents a substantial clinical problem associated with development of motor impairment, cognitive deficits and psychiatric problems. According to clinical studies, magnesium sulphate (MgSO4) given to women in preterm labor reduces the risk of cerebral palsy in the offspring but the mechanisms behind its neuroprotective effects are still unclear. Our aim was to explore whether MgSO4 induces tolerance (preconditioning) in the preterm rodent brain...
January 17, 2018: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/29352997/microglia-and-neonatal-brain-injury
#5
Carina Mallard, Marie-Eve Tremblay, Zinaida S Vexler
Microglial cells are now recognized as the "gate-keepers" of healthy brain microenvironment with their disrupted functions adversely affecting neurovascular integrity, neuronal homeostasis, and network connectivity. The perception that these cells are purely toxic under neurodegenerative conditions has been challenged by a continuously-increasing understanding of their complexity, the existence of a broad array of microglial phenotypes, and their ability to rapidly change in a context-dependent manner to attenuate or exacerbate injuries of different nature...
January 15, 2018: Neuroscience
https://www.readbyqxmd.com/read/29346139/blood-biomarkers-for-evaluation-of-perinatal-encephalopathy-state-of-the-art
#6
Ernest M Graham, Allen D Everett, Jean-Christophe Delpech, Frances J Northington
PURPOSE OF REVIEW: The rapid progress in biomarker science is on the threshold of significantly changing clinical care for infants in the neonatal ICU. Infants with neonatal brain injuries will likely be the first group whose management is dramatically altered with point-of-care, rapidly available brain biomarker analysis. Providing an interim update on progress in this area is the purpose of this review. RECENT FINDINGS: Highlighted findings from the past 18 months of publications on biomarkers in neonatal brain injury include; Specific nonbrain markers of cardiac health and global asphyxia continue to provide information on brain injury after hypoxic-ischemic encephalopathy (HIE)...
January 17, 2018: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/29339173/neuroprotective-effects-of-topiramate-and-memantine-in-combination-with-hypothermia-in-hypoxic-ischemic-brain-injury-in-vitro-and-in-vivo
#7
Elisa Landucci, Luca Filippi, Elisabetta Gerace, Serena Catarzi, Renzo Guerrini, Domenico E Pellegrini-Giampietro
Hypoxic-ischemic encephalopathy (HIE) is a major cause of perinatal mortality and subsequent severe neurological sequelae. Mild hypothermia is a standard therapy for HIE, but is used only in selected Reference Centers and in neonates >1800 g. Since neuronal death following HIE occurs by a cascade of events triggered by activation of glutamate receptors, we used in vitro and in vivo models of HIE to examine whether the AMPA/kainate receptor antagonist topiramate and the NMDA receptor antagonist memantine could exert neuroprotective effects, alone or in combination with hypothermia...
January 12, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29335023/early-neonatal-glutaric-aciduria-type-i-hidden-by-perinatal-asphyxia-a-case-report
#8
Giacomo Biasucci, Nicola Morelli, Federica Natacci, Massimo Mastrangelo
BACKGROUND: Perinatal asphyxia (PA) occurs in about 2 to 10 per 1000 live full-term births. Although neonatal epileptic seizures are observed in up to 60% of cases, PA may mimic or subtend other conditions. Hypoxia related brain injury is particularly relevant, as it may have permanent effects on neuropsychomotor development. Antepartum obstetric conditions, may, in turn, lead to hypoxic-ischemic damage to the fetus and the newborn, often underlying PA. Herein, a case of PA that hid and triggered signs and symptoms of Glutaric Aciduria type I (GA-I), is reported...
January 15, 2018: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/29303230/planned-birth-at-or-near-term-for-improving-health-outcomes-for-pregnant-women-with-gestational-diabetes-and-their-infants
#9
REVIEW
Linda M Biesty, Aoife M Egan, Fidelma Dunne, Eugene Dempsey, Pauline Meskell, Valerie Smith, G Meabh Ni Bhuinneain, Declan Devane
BACKGROUND: Gestational diabetes is a type of diabetes that occurs during pregnancy. Women with gestational diabetes are more likely to experience adverse health outcomes such as pre-eclampsia or polyhydramnios (excess amniotic fluid). Their babies are also more likely to have health complications such as macrosomia (birthweight > 4000 g) and being large-for-gestational age (birthweight above the 90th percentile for gestational age). Current clinical guidelines support elective birth, at or near term in women with gestational diabetes to minimise perinatal complications, especially those related to macrosomia...
January 5, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29288070/neonatal-erythropoietin-mitigates-impaired-gait-social-interaction-and-diffusion-tensor-imaging-abnormalities-in-a-rat-model-of-prenatal-brain-injury
#10
Shenandoah Robinson, Christopher J Corbett, Jesse L Winer, Lindsay A S Chan, Jessie R Maxwell, Christopher V Anstine, Tracylyn R Yellowhair, Nicholas A Andrews, Yirong Yang, Laurel O Sillerud, Lauren L Jantzie
Children who are born preterm are at risk for encephalopathy of prematurity, a leading cause of cerebral palsy, cognitive delay and behavioral disorders. Current interventions are limited and none have been shown to reverse cognitive and behavioral impairments, a primary determinant of poor quality of life for these children. Moreover, the mechanisms of perinatal brain injury that result in functional deficits and imaging abnormalities in the mature brain are poorly defined, limiting the potential to target interventions to those who may benefit most...
December 26, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/29274879/glial-cell-responses-in-a-murine-multifactorial-perinatal-brain-injury-model
#11
Miriam Domowicz, Natasha L Wadlington, Judith G Henry, Kasandra Diaz, Miranda J Munoz, Nancy B Schwartz
The impact of traumatic brain injury during the perinatal period, which coincides with glial cell (astrocyte and oligodendrocyte) maturation was assessed to determine whether a second insult, e.g., increased inflammation due to remote bacterial exposure, exacerbates the initial injury's effects, possibly eliciting longer-term brain damage. Thus, a murine multifactorial injury model incorporating both mechanisms consisting of perinatal penetrating traumatic brain injury, with or without intraperitoneal injection of lipopolysaccharide (LPS), an analog of remote pathogen exposure has been developed...
December 21, 2017: Brain Research
https://www.readbyqxmd.com/read/29250782/fresh-stillborn-and-severely-asphyxiated-neonates-share-a-common-hypoxic-ischemic-pathway
#12
Hege L Ersdal, Joar Eilevstjønn, Jørgen E Linde, Anita Yeconia, Estomih R Mduma, Hussein Kidanto, Jeffrey Perlman
OBJECTIVE: To characterize, among non-breathing flaccid neonates at delivery, immediate heartrate and responses to ventilation in relation to the clinical diagnosis of fresh stillbirth (FSB) or early neonatal death (END) within 24 hours. METHODS: The present cross-sectional study included all deliveries at Haydom Hospital in rural Tanzania between July 1, 2013, and July 31, 2016. Ventilation parameters and heartrate were recorded by monitors with ventilation and dry-electrocardiography sensors...
December 17, 2017: International Journal of Gynaecology and Obstetrics
https://www.readbyqxmd.com/read/29241913/the-comparison-of-umbilical-cord-arterial-blood-lactate-and-ph-values-for-predicting-short-term-neonatal-outcomes
#13
Ruta Einikyte, Vilija Snieckuviene, Diana Ramasauskaite, Jurate Panaviene, Virginija Paliulyte, Gina Opolskiene, Edita Kazenaite
OBJECTIVE: Current clinical practice of assessing neonatal condition is based on evaluation of umbilical cord arterial blood pH value rather than lactate. However, evidence shows that lactate is direct and more predictive measurement than pH or at least of equal importance. This study is to assess and compare umbilical cord arterial lactate and pH values for predicting short-term neonatal outcomes. MATERIALS AND METHODS: A retrospective cohort study was conducted at the tertiary level hospital, were arterial umbilical cord blood sampling was collected according to the standard procedures...
December 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29194835/oxidative-stress-diseases-unique-to-the-perinatal-period-a-window-into-the-developing-innate-immune-response
#14
Robert M Dietz, Clyde J Wright
The innate immune system has evolved to play an integral role in the normally developing lung and brain. However, in response to oxidative stress, innate immunity, mediated by specific cellular and molecular programs and signaling, contributes to pathology in these same organ systems. Despite opposing drivers of oxidative stress, namely hyperoxia in neonatal lung injury and hypoxia/ischemia in neonatal brain injury, similar pathways-including toll-like receptors, NFκB and MAPK cascades-have been implicated in tissue damage...
November 30, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/29178051/behavior-disorders-caused-by-perinatal-hypoxia-in-juvenile-rats-and-their-correction-with-gaba-derivative
#15
N E Ordyan, V K Akulova, V I Mironova, V A Otellin
We studied the effects of acute normobaric hypoxia on postnatal day 2 (model of preterm pregnancy) on reflex activity and behavior of juvenile male Wistar rats and the possibility of correction of behavioral deficit by administration of GABA derivative Salifen after hypoxia. It is shown, that perinatal hypoxia impaired righting reflex and forelimb grip strength and increased motor activity in juvenile male rats. Administration of Salifen for 14 days in a dose of 15 mg/kg improved reflex activity and behavior of rats, which indicates the prospect of further study of the therapeutic efficacy of this drug on models of neonatal encephalopathy...
November 25, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29163023/perinatal-asphyxia-in-rat-alters-expression-of-novel-schizophrenia-risk-genes
#16
Alessandra Paparelli, Keiko Iwata, Tomoyasu Wakuda, Conrad Iyegbe, Robin M Murray, Nori Takei
Epidemiological studies suggest that obstetric complications, particularly those related to hypoxia during labor and delivery, are a risk factor for development of schizophrenia. The impact of perinatal asphyxia on postnatal life has been studied in a rodent model of global hypoxia, which is accompanied by cesarean section birth. This asphyxia model shows several behavioral, pharmacological, neurochemical, and neuroanatomical abnormalities in adulthood that have relevance to schizophrenia. Further, it is suggested that schizophrenia has a strong genetic component, and indeed novel candidate genes were recently identified by a genome-wide association study...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29155093/histone-acetylation-of-oligodendrocytes-protects-against-white-matter-injury-induced-by-inflammation-and-hypoxia-ischemia-through-activation-of-bdnf-trkb-signaling-pathway-in-neonatal-rats
#17
Jichong Huang, Li Zhang, Yi Qu, Yan Zhou, Jianghu Zhu, Yafei Li, Tingting Zhu, Fengyan Zhao, Jun Tang, Dezhi Mu
The major pathological damage in encephalopathy of prematurity is white matter injury (WMI). Perinatal hypoxic-ischemia (HI) and inflammation are two major risk factors in the development of WMI. To study the cellular and molecular mechanisms of WMI, we set up a WMI model using lipopolysaccharide-sensitized HI injury in 2-day postnatal rats. Immunofluorescence staining was used to measure the expression of acetylated histone H3 (AH3) in oligodendrocytes, the target cells of WMI; the oligodendrocyte protein markers, NG2, O4, MBP, PLP, and MAG, were detected at different developmental stages...
November 16, 2017: Brain Research
https://www.readbyqxmd.com/read/29150648/shedding-light-on-the-neonatal-brain-probing-cerebral-hemodynamics-by-diffuse-optical-spectroscopic-methods
#18
Parisa Farzam, Erin M Buckley, Pei-Yi Lin, Katherine Hagan, P Ellen Grant, Terrie Eleanor Inder, Stefan A Carp, Maria Angela Franceschini
Investigating the cerebral physiology of healthy term newborns' brains is important for better understanding perinatal brain injuries, of which the most common etiologies are hypoxia and ischemia. Hence, cerebral blood flow and cerebral oxygenation are important biomarkers of brain health. In this study, we employed a hybrid diffuse optical system consisting of diffuse correlation spectroscopy (DCS) and frequency-domain near infrared spectroscopy (FDNIRS) to measure hemoglobin concentration, oxygen saturation, and indices of cerebral blood flow and metabolism...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146864/acute-hypoxia-reoxygenation-and-vascular-oxygen-sensing-in-the-chicken-embryo
#19
Riazuddin Mohammed, Carlos E Salinas, Dino A Giussani, Carlos E Blanco, Angel L Cogolludo, Eduardo Villamor
Fetal/perinatal hypoxia is one of the most common causes of perinatal morbidity and mortality and is frequently accompannied by vascular dysfunction. However, the mechanisms involved have not been fully delineated. We hypothesized that exposure to acute hypoxia-reoxygenation induces alterations in vascular O2 sensing/signaling as well as in endothelial function in the chicken embryo pulmonary artery (PA), mesenteric artery (MA), femoral artery (FA), and ductus arteriosus (DA). Noninternally pipped 19-day embryos were exposed to 10% O2 for 30 min followed by reoxygenation with 21% O2 or 80% O2 Another group was constantly maintained at 21% O2 or at 21% O2 for 30 min and then exposed to 80% O2 Following treatment, responses of isolated blood vessels to hypoxia as well as endothelium-dependent (acetylcholine) and -independent (sodium nitroprusside and forskolin) relaxation were investigated in a wire myograph...
November 2017: Physiological Reports
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
#20
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
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