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perinatal hypoxia

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https://www.readbyqxmd.com/read/28819234/transcriptome-of-neonatal-preb%C3%A3-tzinger-complex-neurones-in-dbx1-reporter-mice
#1
John A Hayes, Andrew Kottick, Maria Cristina D Picardo, Andrew D Halleran, Ronald D Smith, Gregory D Smith, Margaret S Saha, Christopher A Del Negro
We sequenced the transcriptome of brainstem interneurons in the specialized respiratory rhythmogenic site dubbed preBötzinger Complex (preBötC) from newborn mice. To distinguish molecular characteristics of the core oscillator we compared preBötC neurons derived from Dbx1-expressing progenitors that are respiratory rhythmogenic to neighbouring non-Dbx1-derived neurons, which support other respiratory and non-respiratory functions. Results in three categories are particularly salient. First, Dbx1 preBötC neurons express κ-opioid receptors in addition to μ-opioid receptors that heretofore have been associated with opiate respiratory depression, which may have clinical applications...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808079/the-impact-of-iugr-on-pancreatic-islet-development-and-%C3%AE-cell-function
#2
Brit H Boehmer, Sean W Limesand, Paul J Rozance
Placental insufficiency is a primary cause of intrauterine growth restriction (IUGR). IUGR increases the risk of developing type 2 diabetes mellitus (T2DM) throughout life, which indicates that insults from placental insufficiency impair β-cell development during the perinatal period because β-cells have a central role in the regulation of glucose tolerance. The severely IUGR fetal pancreas is characterized by smaller islets, less β-cells, and lower insulin secretion. Because of the important associations among impaired islet growth, β-cell dysfunction, impaired fetal growth, and the propensity for T2DM, significant progress has been made in understanding the pathophysiology of IUGR and programing events in the fetal endocrine pancreas...
August 14, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28782169/impact-of-neonatal-hypoxia-ischaemia-on-oligodendrocyte-survival-maturation-and-myelinating-potential
#3
Malgorzata Ziemka-Nalecz, Justyna Janowska, Lukasz Strojek, Joanna Jaworska, Teresa Zalewska, Malgorzata Frontczak-Baniewicz, Joanna Sypecka
Hypoxic-ischaemic episodes experienced at the perinatal period commonly lead to a development of neurological disabilities and cognitive impairments in neonates or later in childhood. Clinical symptoms often are associated with the observed alterations in white matter in the brains of diseased children, suggesting contribution of triggered oligodendrocyte/myelin pathology to the resulting disorders. To date, the processes initiated by perinatal asphyxia remain unclear, hampering the ability to develop preventions...
August 7, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28760642/galantamine-administration-reduces-reactive-astrogliosis-and-upregulates-the-anti-oxidant-enzyme-catalase-in-rats-submitted-to-neonatal-hypoxia-ischemia
#4
F K Odorcyk, F Nicola, L E Duran-Carabali, F Figueiró, J Kolling, A Vizuete, E L Konrath, C A Gonçalves, A T S Wyse, C A Netto
Neonatal hypoxia ischemia (HI) plays a role in the etiology of several neurological pathologies and causes severe sequelae. Acetylcholine is a neurotransmitter in the central nervous system and cholinesterase inhibitors have demonstrated a positive action over HI induced deficits. In order to evaluate the effects of pre and post-hypoxia administrations of galantamine, a cholinesterase inhibitor, in a model of perinatal HI, Wistar rats in the post-natal day 7 (PND7) were subjected to a combination of unilateral occlusion of the right carotid artery with the exposure to a 1h hypoxia...
July 29, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28747873/mitochondria-bioenergetics-and-excitotoxicity-new-therapeutic-targets-in-perinatal-brain-injury
#5
REVIEW
Bryan Leaw, Syam Nair, Rebecca Lim, Claire Thornton, Carina Mallard, Henrik Hagberg
Injury to the fragile immature brain is implicated in the manifestation of long-term neurological disorders, including childhood disability such as cerebral palsy, learning disability and behavioral disorders. Advancements in perinatal practice and improved care mean the majority of infants suffering from perinatal brain injury will survive, with many subtle clinical symptoms going undiagnosed until later in life. Hypoxic-ischemia is the dominant cause of perinatal brain injury, and constitutes a significant socioeconomic burden to both developed and developing countries...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28747364/cerebral-oxygenation-during-skin-to-skin-care-in-preterm-infants-not-receiving-respiratory-support
#6
Laila Lorenz, Adriana Marulli, Jennifer A Dawson, Louise S Owen, Brett J Manley, Susan M Donath, Peter G Davis, C Omar F Kamlin
OBJECTIVE: Skin-to-skin care (SSC) has proven benefits in preterm infants, but increased hypoxic and bradycardic events have been reported. This may make clinicians hesitant to recommend SSC as standard care. We hypothesised that regional cerebral oxygenation (rStO2) measured with near infrared spectroscopy is not worse during SSC compared with standard incubator care. DESIGN: Prospective, observational, non-inferiority study. SETTING: Single tertiary perinatal centre in Australia...
July 26, 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28706574/neuronal-damage-induced-by-perinatal-asphyxia-is-attenuated-by-postinjury-glutaredoxin-2-administration
#7
Juan Ignacio Romero, Mariana Inés Holubiec, Tamara Logica Tornatore, Stéphanie Rivière, Eva-Maria Hanschmann, Rodolfo Alberto Kölliker-Frers, Julia Tau, Eduardo Blanco, Pablo Galeano, Fernando Rodríguez de Fonseca, Christopher Horst Lillig, Francisco Capani
The general disruption of redox signaling following an ischemia-reperfusion episode has been proposed as a crucial component in neuronal death and consequently brain damage. Thioredoxin (Trx) family proteins control redox reactions and ensure protein regulation via specific, oxidative posttranslational modifications as part of cellular signaling processes. Trx proteins function in the manifestation, progression, and recovery following hypoxic/ischemic damage. Here, we analyzed the neuroprotective effects of postinjury, exogenous administration of Grx2 and Trx1 in a neonatal hypoxia/ischemia model...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28698869/effects-of-poly-adp-ribose-polymerase-1-inhibition-in-a-neonatal-rodent-model-of-hypoxic-ischemic-injury
#8
Melanie Klöfers, Jules Kohaut, Ivo Bendix, Josephine Herz, Vinzenz Boos, Ursula Felderhoff-Müser, Mark Dzietko
BACKGROUND: Hypoxia ischemia (HI) to the developing brain occurs in 1-6 in 1000 live births. Large numbers of survivors have neurological long-term sequelae. However, mechanisms of recovery after HI are not understood and preventive measures or clinical treatments are not effective. Poly(ADP-ribose) polymerase-1 is overactivated in response to ischemia. In neonatal mice HI activates PARP-1 but its role in perinatal brain injury remains uncertain. OBJECTIVE: Aim of this study was to explore the effect of TES448 (PARP-1-inhibitor) and hypothermia after an ischemic insult...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28680565/oxidative-injury-of-the-pulmonary-circulation-in-the-perinatal-period-short-and-long-term-consequences-for-the-human-cardiopulmonary-system
#9
Daphne P de Wijs-Meijler, Dirk J Duncker, Dick Tibboel, Ralph T Schermuly, Norbert Weissmann, Daphne Merkus, Irwin K M Reiss
Development of the pulmonary circulation is a complex process with a spatial pattern that is tightly controlled. This process is vulnerable for disruption by various events in the prenatal and early postnatal periods. Disruption of normal pulmonary vascular development leads to abnormal structure and function of the lung vasculature, causing neonatal pulmonary vascular diseases. Premature babies are especially at risk of the development of these diseases, including persistent pulmonary hypertension and bronchopulmonary dysplasia...
March 2017: Pulmonary Circulation
https://www.readbyqxmd.com/read/28676133/caffeine-supplementation-of-ewes-during-lambing-may-increase-lamb-survival
#10
S M Robertson, M A Friend, G S Doran, S Edwards
Perinatal mortality of lambs is on average 20% of lambs born in extensive Australian grazing systems, constituting a substantial production loss and welfare concern. Hypoxia resulting from prolonged or difficult births contributes to lower rates of lamb survival, and caffeine may reduce the effects of hypoxia. This study evaluated whether oral supplementation of grazing ewes with caffeine could improve lamb survival. Pregnant Merino ewes (n=492) which had been naturally mated to Merino rams in February/March were allocated to three replicates of control (no caffeine) or caffeine treatments...
July 5, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28648719/modification-to-the-rice-vannucci-perinatal-hypoxic-ischaemic-encephalopathy-model-in-the-p7-rat-improves-the-reliability-of-cerebral-infarct-development-after-48hours
#11
Adam B Edwards, Kirk W Feindel, Jane L Cross, Ryan S Anderton, Vincent W Clark, Neville W Knuckey, Bruno P Meloni
BACKGROUND: The Rice-Vannucci model of hypoxic-ischaemic encephalopathy (HIE) has been associated with a high degree of variability with respect to the development of cerebral infarction and infarct lesion volume. For this reason, we examined the occurrence of communicational blood flow within the common carotid (CCA), internal (ICA), and external (ECA) carotid arteries following CCA occlusion as a source of variability in the model. NEW METHOD: We propose a novel modification to the Rice-Vannucci model, whereby both the CCA and ECA are permanently ligated; mitigating communicational blood flow...
June 23, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28601871/perinatal-factors-affecting-serum-hepcidin-levels-in-low-birth-weight-infants
#12
Kenji Ichinomiya, Kenichi Maruyama, Takahiro Inoue, Aya Koizumi, Fumitaka Inoue, Kazuyo Fukuda, Yu Yamazaki, Hirokazu Arakawa
BACKGROUND: Hepcidin, an iron-regulatory hormone, plays a key role in preventing iron overload. Few studies have investigated the regulation of hepcidin in low-birth-weight (LBW) infants who are vulnerable to iron imbalance. OBJECTIVES: To identify perinatal factors associated with serum hepcidin levels in LBW infants. METHODS: Ninety-two LBW infants with a median gestational age (GA) of 32.6 weeks and birth weight of 1,587 g were prospectively enrolled...
2017: Neonatology
https://www.readbyqxmd.com/read/28596740/ultrasound-imaging-of-mouse-fetal-intracranial-hemorrhage-due-to-ischemia-reperfusion
#13
Kenichi Funamoto, Takuya Ito, Kiyoe Funamoto, Clarissa L Velayo, Yoshitaka Kimura
Despite vast improvement in perinatal care during the 30 years, the incidence rate of neonatal encephalopathy remains unchanged without any further Progress towards preventive strategies for the clinical impasse. Antenatal brain injury including fetal intracranial hemorrhage caused by ischemia/reperfusion is known as one of the primary triggers of neonatal injury. However, the mechanisms of antenatal brain injury are poorly understood unless better predictive models of the disease are developed. Here we show a mouse model for fetal intracranial hemorrhage in vivo developed to investigate the actual timing of hypoxia-ischemic events and their related mechanisms of injury...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28580361/neuroprotection-via-rna-binding-protein-rbm3-expression-is-regulated-by-hypothermia-but-not-by-hypoxia-in-human-sk-n-sh-neurons
#14
Lisa-Maria Rosenthal, Giang Tong, Christoph Walker, Sylvia J Wowro, Jana Krech, Constanze Pfitzer, Georgia Justus, Felix Berger, Katharina Rose Luise Schmitt
OBJECTIVE: Therapeutic hypothermia is an established treatment for perinatal asphyxia. Yet, many term infants continue to die or suffer from neurodevelopmental disability. Several experimental studies have demonstrated a beneficial effect of mild-to-moderate hypothermia after hypoxic injury, but the understanding of hypothermia-induced neuroprotection remains incomplete. In general, global protein synthesis is attenuated by hypothermia, but a small group of RNA-binding proteins including the RNA-binding motif 3 (RBM3) is upregulated in response to cooling...
2017: Hypoxia
https://www.readbyqxmd.com/read/28576310/the-paracrine-effect-of-cobalt-chloride-on-bmscs-during-cognitive-function-rescue-in-the-hibd-rat
#15
Ying Dai, Wendi Li, Min Zhong, Jie Chen, Qian Cheng, Youxue Liu, Tingyu Li
Hypoxia-ischemia (HI)-induced perinatal encephalopathy frequently causes chronic neurological morbidities and acute mortality. Bone mesenchymal stem cell (BMSC) transplantation could potentially promote functional and anatomical recovery of ischemic tissue. In vitro hypoxic preconditioning is an effective strategy to improve the survival of BMSCs in ischemic tissue. In this study, cobalt chloride (CoCl2) preconditioned medium from BMSC cultures was injected into the left lateral ventricle of HI rats using a micro-osmotic pump at a flow rate 1...
May 30, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28564654/high-dose-cannabidiol-induced-hypotension-after-global-hypoxia-ischemia-in-piglets
#16
Håvard T Garberg, Rønnaug Solberg, Jon Barlinn, Jose Martinez-Orgado, Else-Marit Løberg, Ola Didrik Saugstad
BACKGROUND: Cannabidiol (CBD) is considered a promising neuroprotectant after perinatal hypoxia-ischemia (HI). We have previously studied the effects of CBD 1 mg/kg in the early phase after global HI in piglets. In contrast to prior studies, we found no evidence of neuroprotection and hypothesized that higher doses might be required to demonstrate efficacy in this animal model. OBJECTIVE: To assess the safety and potential neuroprotective effects of high-dose CBD...
2017: Neonatology
https://www.readbyqxmd.com/read/28518065/transient-middle-cerebral-artery-occlusion-model-of-neonatal-stroke-in-p10-rats
#17
Amara Larpthaveesarp, Fernando F Gonzalez
A number of animal models have been used to study hypoxic-ischemic injury, traumatic injury, global hypoxia, or permanent ischemia in both the immature and mature brain. Stroke occurs commonly in the perinatal period in humans, and transient ischemia-reperfusion is the most common form of stroke in neonates. The reperfusion phase is a critical component of injury progression, which occurs over a period of days to weeks, and of the endogenous response to injury. This postnatal day 10 (p10) rat model of transient middle cerebral artery occlusion (tMCAO) creates a unilateral, non-hemorrhagic focal ischemia-reperfusion injury that can be utilized to study the mechanisms of focal injury and repair in the full-term-equivalent brain...
April 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28512386/oxidative-stress-biomarkers-establishment-of-reference-values-for-isoprostanes-aopp-and-npbi-in-cord-blood
#18
Mariangela Longini, Elisa Belvisi, Fabrizio Proietti, Francesco Bazzini, Giuseppe Buonocore, Serafina Perrone
Oxidative stress (OS) is a common pathogenic factor involved in the onset of several diseases in humans, from immunologic disorders to malignancy, being a serious public health problem. In perinatal period, OS has been associated with adverse outcome of pregnancy and neonatal diseases. Dangerous effects of OS are mediated by increased production of free radicals (FRs) following various mechanisms, such as hypoxia, ischemia reperfusion, hyperoxia, inflammation, mitochondrial dysfunction, Fenton chemistry, and prostaglandin metabolism...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28453380/lipids-on-the-second-day-in-ischemic-and-normoxemic-term-neonates
#19
Miljana Z Jovandaric, Tatjana V Nikolic, Svetlana J Milenkovic, Biljana S Otaševic, Violeta V Bankovic, Petar I Ivanovski, Milos M Jesic
INTRODUCTION: In hypoxic newborns requiring oxygen, lipid peroxidation affects the peripheral blood lipids. OBJECTIVES: Determine the influence of perinatal oxygen therapy for hypoxia on serum lipid concentrations on the second day of life. MATERIALS AND METHODS: Our study included 50 newborns with perinatal hypoxia requiring oxygen and 50 healthy newborns without oxygen therapy. Arterialized capillary blood was taken for categorization of hypoxia (pO2) after birth in both groups...
April 28, 2017: Fetal and Pediatric Pathology
https://www.readbyqxmd.com/read/28448965/neuroprotective-treatments-after-perinatal-hypoxic-ischemic-brain-injury-evaluated-with-magnetic-resonance-spectroscopy
#20
Hester Rijkje Berger, Eva Brekke, Marius Widerøe, Tora S Morken
Perinatal hypoxic-ischemic brain injury is a major health problem. Adjuvant treatments that improve the neuroprotective effect of the current treatment, therapeutic hypothermia, are urgently needed. The growing knowledge about the complex pathophysiology of hypoxia-ischemia (HI) has led to the discovery of several important targets for neuroprotection. Early interventions should focus on the preservation of energy metabolism, the reduction of glutamate excitotoxicity and oxidative stress, the maintenance of calcium homeostasis, and the prevention of apoptosis...
2017: Developmental Neuroscience
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