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Hypoxia-ischemia

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https://www.readbyqxmd.com/read/29346139/blood-biomarkers-for-evaluation-of-perinatal-encephalopathy-state-of-the-art
#1
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/29341045/approach-to-infants-born-through-meconium-stained-amniotic-fluid-evolution-based-on-evidence
#2
Munmun Rawat, Sushma Nangia, Praveen Chandrasekharan, Satyan Lakshminrusimha
Meconium-stained amniotic fluid (MSAF) during delivery is a marker of fetal stress. Neonates born through MSAF often need resuscitation and are at risk of meconium aspiration syndrome (MAS), air leaks, hypoxic-ischemic encephalopathy, extracorporeal membrane oxygenation (ECMO), and death. The neonatal resuscitation approach to MSAF has evolved over the last three decades. Previously, nonvigorous neonates soon after delivery were suctioned under the vocal cords with direct visualization technique using a meconium aspirator...
January 16, 2018: American Journal of Perinatology
https://www.readbyqxmd.com/read/29336073/hypoxia-ischemia-and-brain-injury-in-infants-born-preterm
#3
Nigel Paneth
No abstract text is available yet for this article.
February 2018: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/29326493/renal-mitochondria-can-withstand-hypoxic-ischemic-injury-secondary-to-renal-failure-in-uremic-rats-pretreated-with-sodium-thiosulfate
#4
Dhivya Mohan, Eswari Dhivya Balasubramanian, Sriram Ravindran, Gino A Kurian
BACKGROUND: Sodium thiosulfate (STS) is a potent drug used to treat calcific uremic arteriopathy in dialysis patients and its mode of action is envisaged by calcium chelation and antioxidant potential. STS's action on mitochondrial dysfunction, one of the major players in the pathology of vascular calcification is yet to be explored. METHODS: Adenine (0.75%, 28 days)-treated vascular calcified rat kidney was used to isolate mitochondria, where the animal was administered with or without STS for 28 days...
July 2017: Indian Journal of Pharmacology
https://www.readbyqxmd.com/read/29326137/expression-changes-in-lactate-and-glucose-metabolism-and-associated-transporters-in-basal-ganglia-following-hypoxic-ischemic-reperfusion-injury-in-piglets
#5
Y Zheng, X-M Wang
BACKGROUND AND PURPOSE: The neonatal brain has active energy metabolism, and glucose oxidation is the major energy source of brain tissue. Lactate is produced by astrocytes and released to neurons. In the central nervous system, lactate is transported between neurons and astrocytes via the astrocyte-neuron lactate shuttle. The aim of this study was to investigate the regulatory mechanisms of energy metabolism in neurons and astrocytes in the basal ganglia of a neonatal hypoxic-ischemic brain injury piglet model...
January 11, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29324491/validation-of-a-second-generation-near-infrared-spectroscopy-monitor-in-children-with-congenital-heart-disease
#6
Viviane G Nasr, Lisa T Bergersen, Hung-Mo Lin, Paul B Benni, Rachel S Bernier, Michelle E Anderson, Barry D Kussman
BACKGROUND: Cerebral oximetry using near-infrared spectroscopy is a noninvasive optical technology to detect cerebral hypoxia-ischemia and develop interventions to prevent and ameliorate hypoxic brain injury. Cerebral oximeters are calibrated and validated by comparison of the near-infrared spectroscopy-measured cerebral O2 saturation (SctO2) to a "field" or reference O2 saturation (REF CX) calculated as a weighted average from arterial and jugular bulb oxygen saturations. In this study, we calibrated and validated the second-generation, 5 wavelength, FORE-SIGHT Elite with the medium sensor (source-detector separation 12 and 40 mm) for measurement of SctO2 in children with congenital heart disease...
January 9, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29324456/targeted-knockdown-of-bone-morphogenetic-protein-signaling-within-neural-progenitors-protects-the-brain-and-improves-motor-function-following-postnatal-hypoxia-ischemia
#7
Robert W Dettman, Derin Birch, Augusta Fernando, John A Kessler, Maria L V Dizon
Hypoxic-ischemic injury (HI) to the neonatal human brain results in myelin loss that, in some children, can manifest as cerebral palsy. Previously, we had found that neuronal overexpression of the bone morphogenic protein (BMP) inhibitor noggin during development increased oligodendroglia and improved motor function in an experimental model of HI utilizing unilateral common carotid artery ligation followed by hypoxia. As BMPs are known to negatively regulate oligodendroglial fate specification of neural stem cells and alter differentiation of committed oligodendroglia, BMP signaling is likely an important mechanism leading to myelin loss...
January 12, 2018: Developmental Neuroscience
https://www.readbyqxmd.com/read/29316558/neural-stem-cells-expressing-bfgf-reduce-brain-damage-and-restore-sensorimotor-function-after-neonatal-hypoxia-ischemia
#8
Qingsong Ye, Yanqing Wu, Jiamin Wu, Shuang Zou, Ali Ahmed Al-Zaazaai, Hongyu Zhang, Hongxue Shi, Ling Xie, Yanlong Liu, Ke Xu, Huacheng He, Fabiao Zhang, Yiming Ji, Yan He, Jian Xiao
BACKGROUND/AIMS: Neonatal hypoxia-ischemia (HI) causes severe brain damage and significantly increases neonatal morbidity and mortality. Increasing evidences have verified that stem cell-based therapy has the potential to rescue the ischemic tissue and restore function via secreting growth factors after HI. Here, we had investigated whether intranasal neural stem cells (NSCs) treatment improves the recovery of neonatal HI, and NSCs overexpressing basic fibroblast growth factor (bFGF) has a better therapeutic effect for recovery than NSCs treatment only...
December 22, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29315570/evolving-changes-in-fetal-heart-rate-variability-and-brain-injury-after-hypoxia-ischemia-in-preterm-fetal-sheep
#9
Kyohei Yamaguchi, Christopher A Lear, Michael J Beacom, Tomoaki Ikeda, Alistair J Gunn, Laura Bennet
Hypoxia-ischemia (HI) is a major contributor to preterm brain injury, but there are currently no reliable biomarkers to identify at risk infants. We tested the hypothesis that fetal heart rate (FHR) and FHR variability (FHRV) would identify evolving brain injury after HI. Fetal sheep at 0.7 of gestation were subjected to either 15 (15-min, n = 10) or 25 min (25-min, n = 17) of complete umbilical cord occlusion or sham occlusion (n = 12). FHR and four measures of FHRV (STV, LTV, SDNN, RMSSD) were assessed until 72 h after HI...
January 8, 2018: Journal of Physiology
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/29284676/coordinated-regulation-of-intracellular-ph-by-two-glucose-sensing-pathways-in-yeast
#11
Daniel G Isom, Stephani C Page, Leonard B Collins, Nicholas J Kapolka, Geoffrey J Taghon, Henrik G Dohlman
The yeast Saccharomyces cerevisiae employs multiple pathways to coordinate sugar availability and metabolism. Glucose and other sugars are detected by a G protein coupled receptor, Gpr1, as well as a pair of transporter-like proteins, Rgt2 and Snf3. When glucose is limiting however, an ATP-driven proton pump (Pma1) is inactivated leading to a marked decrease in cytoplasmic pH. Here we determine the relative contribution of the two sugar sensing pathways to pH regulation. Whereas cytoplasmic pH is strongly dependent on glucose abundance, and is regulated by both glucose-sensing pathways, ATP is largely unaffected and therefore cannot account for the changes in Pma1 activity...
December 28, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29278365/sexually-dimorphic-outcomes-after-neonatal-stroke-and-hypoxia-ischemia
#12
REVIEW
Christiane Charriaut-Marlangue, Valérie C Besson, Olivier Baud
Cohort studies have demonstrated a higher vulnerability in males towards ischemic and/or hypoxic-ischemic injury in infants born near- or full-term. Male sex was also associated with limited brain repair following neonatal stroke and hypoxia-ischemia, leading to increased incidence of long-term cognitive deficits compared to females with similar brain injury. As a result, the design of pre-clinical experiments considering sex as an important variable was supported and investigated because neuroprotective strategies to reduce brain injury demonstrated sexual dimorphism...
December 26, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29227795/divergent-effects-of-levetiracetam-and-tiagabine-against-spontaneous-seizures-in-adult-rats-following-neonatal-hypoxia
#13
Raymond Dunn, Bridget N Queenan, Daniel T S Pak, Patrick A Forcelli
Animal models are valuable tools for screening novel therapies for patients who suffer from epilepsy. However, a wide array of models are necessary to cover the diversity of human epilepsies. In humans, neonatal hypoxia (or hypoxia-ischemia) is one of the most common causes of epilepsy early in life. Hypoxia-induced seizures (HS) during the neonatal period can also lead to spontaneous seizures in adulthood. This phenomenon, i.e., early-life hypoxia leading to adult epilepsy - is also seen in experimental models, including rats...
December 5, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29225974/modulation-effects-of-cordycepin-on-voltage-gated-sodium-channels-in-rat-hippocampal-ca1-pyramidal-neurons-in-the-presence-absence-of-oxygen
#14
Zhi-Bin Liu, Chao Liu, Bin Zeng, Li-Ping Huang, Li-Hua Yao
Our previous study revealed that cordycepin features important neuroprotective effects against hypoxic insult by improvement of neuronal electrophysiological function. Modulation on voltage-gated sodium channel (VGSC) in CA1 neurons is the initial event during hypoxia/ischemia. However, no study comprehensively investigated cordycepin on VGSC. Hence, this study investigated modulation effects of cordycepin on VGSC not only in oxygen physiological conditions but also in acute oxygen deprivation injury conditions...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/29208736/pathophysiological-and-behavioral-deficits-in-developing-mice-following-rotational-acceleration-deceleration-traumatic-brain-injury
#15
Guoxiang Wang, Yi Ping Zhang, Zhongwen Gao, Lisa B E Shields, Fang Li, Tianci Chu, Huayi Lv, Thomas Moriarty, Xiao-Ming Xu, Xiaoyu Yang, Christopher B Shields, Jun Cai
Abusive head trauma (AHT) is the leading cause of death from trauma in infants and young children. An AHT animal model was developed on 12-day-old mice subjected to 90° head extension-flexion sagittal shaking repeated 30, 60, 80, and 100 times. The mortality and time until return of consciousness were dependent on the number of repeats and severity of the injury. Under 60 times of repeated head shakings, the pups demonstrated apnea and/or bradycardia immediately after injury. Acute oxygen desaturation was observed by pulse oximetry during respiratory and cardiac suppression...
November 30, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/29206066/magnesium-induces-preconditioning-of-the-neonatal-brain-via-profound-mitochondrial-protection
#16
Gabriella Koning, Anna-Lena Leverin, Syam Nair, Leslie Schwendimann, Joakim Ek, Ylva Carlsson, Pierre Gressens, Claire Thornton, Xiaoyang Wang, Carina Mallard, Henrik Hagberg
Magnesium sulphate (MgSO4) given to women in preterm labor reduces cerebral palsy in their offspring but the mechanism behind this protection is unclear, limiting its effective, safe clinical implementation. Previous studies suggest that MgSO4 is not neuroprotective if administered during or after the insult, so we hypothesised that MgSO4 induces preconditioning in the immature brain. Therefore, we administered MgSO4 at various time-points before/after unilateral hypoxia-ischemia (HI) in seven-day-old rats...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29199131/combined-therapy-involving-electroacupuncture-and-treadmill-exercise-attenuates-demyelination-in-the-corpus-callosum-by-stimulating-oligodendrogenesis-in-a-rat-model-of-neonatal-hypoxia-ischemia
#17
Malk Eun Pak, Da Hee Jung, Hong Ju Lee, Myung Jun Shin, Soo-Yeon Kim, Yong Beom Shin, Young Ju Yun, Hwa Kyoung Shin, Byung Tae Choi
We investigated whether electroacupuncture (EA) and treadmill (TM) exercise improve behaviors related to motor and memory dysfunction in a cerebral palsy-like rat model via activation of oligodendrogenesis. A neonatal hypoxia-ischemia model was created using Sprague-Dawley rats (P7), and these underwent EA stimulation and treadmill training from 3 to 5weeks after hypoxia-ischemia induction. EA treatment was delivered via electrical stimulation (2Hz, 1mA) at two acupoints, Baihui (GV20) and Zusanli (ST36). Behavioral tests showed that EA alleviated motor dysfunction caused by hypoxia-ischemia on a rotarod test, and TM exercise alleviated motor and memory dysfunction seen on cylinder and passive avoidance tests...
February 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29194835/oxidative-stress-diseases-unique-to-the-perinatal-period-a-window-into-the-developing-innate-immune-response
#18
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/29194585/complex-interactions-between-hypoxia-ischemia-and-inflammation-in-preterm-brain-injury
#19
REVIEW
Robert Galinsky, Christopher A Lear, Justin M Dean, Guido Wassink, Simerdeep K Dhillon, Mhoyra Fraser, Joanne O Davidson, Laura Bennet, Alistair J Gunn
Children surviving preterm birth have a high risk of disability, particularly cognitive and learning problems. There is extensive clinical and experimental evidence that disability is now primarily related to dysmaturation of white and gray matter, defined by failure of oligodendrocyte maturation and neuronal dendritic arborization, rather than cell death alone. The etiology of this dysmaturation is multifactorial, with contributions from hypoxia-ischemia, infection/inflammation and barotrauma. Intriguingly, these factors can interact to both increase and decrease damage...
December 1, 2017: Developmental Medicine and Child Neurology
https://www.readbyqxmd.com/read/29192254/effect-of-src-kinase-inhibition-on-cytochrome-c-smac-diablo-and-apoptosis-inducing-factor-aif-following-cerebral-hypoxia-ischemia-in-newborn-piglets
#20
Panagiotis Kratimenos, Ioannis Koutroulis, Beamon Agarwal, Stamatios Theocharis, Maria Delivoria-Papadopoulos
We have previously shown that cerebral Hypoxia-ischemia (HI) results in activation of Src kinase in the newborn piglet brain. We investigated the regulatory mechanism by which the pre-apoptotic proteins translocate from mitochondria to the cytosol during HI through the Src kinase. Newborn piglets were divided into 3 groups (n = 5/group): normoxic (Nx), HI and HI pre-treated with Src kinase inhibitor PP2 (PP2 + HI). Brain tissue HI was verified by neuropathological analysis and by Adenosine Triphosphate (ATP) and Phosphocreatine (PCr) levels...
November 30, 2017: Scientific Reports
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