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Umbilical cord occlusion

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https://www.readbyqxmd.com/read/29776835/the-combination-of-mannitol-and-temozolomide-increases-the-effectiveness-of-stem-cell-treatment-in-a-chronic-stroke-model
#1
Chunggab Choi, Hye Min Kim, Jeeheun Shon, Jiae Park, Hyeong-Taek Kim, Suk Ho Kang, Seung-Hun Oh, Nam Keun Kim, Ok Joon Kim
BACKGROUND: The blood-brain barrier (BBB) presents a significant challenge to the therapeutic efficacy of stem cells in chronic stroke. Various methods have been developed to increase BBB permeability, but these are associated with adverse effects and are, therefore, not clinically applicable. We recently identified that combination drug treatment of mannitol and temozolomide improved BBB permeability in vitro. Here, we investigated whether this combination could increase the effectiveness of stem cell treatment in an animal model of chronic ischemic stroke...
May 15, 2018: Cytotherapy
https://www.readbyqxmd.com/read/29752867/topical-application-of-culture-expanded-cd34-umbilical-cord-blood-cells-from-frozen-units-accelerates-healing-of-diabetic-skin-wounds-in-mice
#2
Jennifer Whiteley, Theresa Chow, Hibret Adissu, Armand Keating, Ian M Rogers
Chronic and nonhealing wounds are constant health issues facing patients with type 2 diabetes. As the incidence of type 2 diabetes mellitus (T2DM) increases, the incidence of chronic wounds and amputations will rise. T2DM is associated with peripheral arterial occlusive disease, which leads to the development of nonhealing skin ulcers after minor trauma. Patients develop severe pain limiting their mobility and ability to work and take care of themselves thus putting a significant burden on the family and society...
May 12, 2018: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/29751775/cxcl12-engineered-endothelial-progenitor-cells-enhance-neurogenesis-and-angiogenesis-after-ischemic-brain-injury-in-mice
#3
Yaning Li, Shuang Chang, Wanlu Li, Guanghui Tang, Yuanyuan Ma, Yanqun Liu, Fang Yuan, Zhijun Zhang, Guo-Yuan Yang, Yongting Wang
BACKGROUND: Ischemic stroke causes a multitude of brain damage. Neurovascular injury and myelin sheath degradation are two manifestations of ischemic brain damage. Therapeutic strategies aiming only at repairing the neural components or the vessels cannot efficiently restore neurological function. Endothelial progenitor cells (EPCs) have the advantages of both promoting angiogenesis and secreting trophic factors that would promote neurogenesis. Chemokine cxcl12 gene therapy has also been shown to promote angiogenesis, neurogenesis, and remyelination, attracting EPCs, neural progenitor cells, and oligodendrocyte progenitor cells (OPCs) to the injured sites of the brain...
May 11, 2018: Stem Cell Research & Therapy
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
#4
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/29659625/st-waveform-analysis-for-monitoring-hypoxic-distress-in-fetal-sheep-after-prolonged-umbilical-cord-occlusion
#5
Peter Andriessen, Alex Zwanenburg, Judith O E H van Laar, Rik Vullings, Ben J M Hermans, Hendrik J Niemarkt, Reint K Jellema, Daan R M G Ophelders, Tim G A M Wolfs, Boris W Kramer, Tammo Delhaas
INTRODUCTION: The inconclusive clinical results for ST-waveform analysis (STAN) in detecting fetal hypoxemia may be caused by the signal processing of the STAN-device itself. We assessed the performance of a clinical STAN device in signal processing and in detecting hypoxemia in a fetal sheep model exposed to prolonged umbilical cord occlusion (UCO). METHODS: Eight fetal lambs were exposed to 25 minutes of UCO. ECG recordings were analyzed during a baseline period and during UCO...
2018: PloS One
https://www.readbyqxmd.com/read/29572829/time-and-sex-dependent-effects-of-magnesium-sulphate-on-post-asphyxial-seizures-in-preterm-fetal-sheep
#6
Laura Bennet, Robert Galinsky, Vittoria Draghi, Christopher A Lear, Joanne O Davidson, Charles P Unsworth, Alistair J Gunn
KEY POINTS: We evaluated the effect of magnesium sulphate (MgSO4 ) on seizures induced by asphyxia in preterm fetal sheep. MgSO4 did not prevent seizures, but significantly reduced the total duration, number of seizures, seizure amplitude and average seizure burden. Saline-asphyxia male fetuses had significantly more seizures than female fetuses, but male fetuses showed significantly greater reduction in seizures during MgSO4 infusion than female fetuses. A circadian profile of seizure activity was observed in all fetuses, with peak seizures seen around 04...
March 23, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29568282/dose-dependent-effect-of-intravenous-administration-of-human-umbilical-cord-derived-mesenchymal-stem-cells-in-neonatal-stroke-mice
#7
Emi Tanaka, Yuko Ogawa, Takeo Mukai, Yoshiaki Sato, Takashi Hamazaki, Tokiko Nagamura-Inoue, Mariko Harada-Shiba, Haruo Shintaku, Masahiro Tsuji
Neonatal brain injury induced by stroke causes significant disability, including cerebral palsy, and there is no effective therapy for stroke. Recently, mesenchymal stem cells (MSCs) have emerged as a promising tool for stem cell-based therapies. In this study, we examined the safety and efficacy of intravenously administered human umbilical cord-derived MSCs (UC-MSCs) in neonatal stroke mice. Pups underwent permanent middle cerebral artery occlusion at postnatal day 12 (P12), and low-dose (1 × 104 ) or high-dose (1 × 105 ) UC-MSCs were administered intravenously 48 h after the insult (P14)...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29561649/magnesium-sulfate-and-sex-differences-in-cardiovascular-and-neural-adaptations-during-normoxia-and-asphyxia-in-preterm-fetal-sheep
#8
Robert Galinsky, Simerdeep K Dhillon, Christopher A Lear, Kyohei Yamaguchi, Guido Wassink, Alistair J Gunn, Laura Bennet
Magnesium sulfate (MgSO4 ) is recommended for preterm neuroprotection, preeclampsia and preterm labor prophylaxis. There is an important unmet need to carefully test clinical interventions in both sexes. Therefore, we aimed to investigate cardiovascular and neurophysiological adaptations to MgSO4 during normoxia and asphyxia in preterm male and female fetal sheep. Fetuses were instrumented at 98{plus minus}1 days of gestation (d; term=147 d). At 104 d, unanaesthetised fetuses were randomly assigned to intravenous MgSO4 (n=12 F, 10 M) or saline (n=13 F, 10 M)...
March 21, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29497380/triple-gene-therapy-for-stroke-a-proof-of-concept-in-vivo-study-in-rats
#9
Mikhail E Sokolov, Farid V Bashirov, Vage A Markosyan, Tatyana V Povysheva, Filip O Fadeev, Andrey A Izmailov, Maxim S Kuztetsov, Zufar Z Safiullov, Maxim M Shmarov, Boris S Naroditskyi, András Palotás, Rustem R Islamov
Natural brain repair after stroke is extremely limited, and current therapeutic options are even more scarce with no clinical break-through in sight. Despite restricted regeneration in the central nervous system, we have previously proved that human umbilical cord blood mono-nuclear cells (UCB-MC) transduced with adenoviral vectors carrying genes encoding vascular endothelial growth factor (VEGF), glial cell-derived neurotrophic factor (GDNF), and neural cell adhesion molecule (NCAM) successfully rescued neurons in amyotrophic lateral sclerosis and spinal cord injury...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29464766/systemic-and-transdermal-melatonin-administration-prevents-neuropathology-in-response-to-perinatal-asphyxia-in-newborn-lambs
#10
James D S Aridas, Tamara Yawno, Amy E Sutherland, Ilias Nitsos, Michael Ditchfield, Flora Y Wong, Rod W Hunt, Michael C Fahey, Atul Malhotra, Euan M Wallace, Graham Jenkin, Suzanne L Miller
Perinatal asphyxia remains a principal cause of infant mortality and long-term neurological morbidity, particularly in low-resource countries. No neuroprotective interventions are currently available. Melatonin (MLT), a potent antioxidant, anti-inflammatory and antiapoptotic agent, offers promise as an intravenous (IV) or transdermal therapy to protect the brain. We aimed to determine the effect of melatonin (IV or transdermal patch) on neuropathology in a lamb model of perinatal asphyxia. Asphyxia was induced in newborn lambs via umbilical cord occlusion at birth...
May 2018: Journal of Pineal Research
https://www.readbyqxmd.com/read/29338384/human-umbilical-cord-mesenchymal-stem-cells-preserve-adult-newborn-neurons-and-reduce-neurological-injury-after-cerebral-ischemia-by-reducing-the-number-of-hypertrophic-microglia-macrophages
#11
Willie Lin, Yogi Chang-Yo Hsuan, Mao-Tsun Lin, Ting-Wei Kuo, Cheng-Hsien Lin, Yu-Chin Su, Ko-Chi Niu, Ching-Ping Chang, Hung-Jung Lin
Microglia are the first source of a neuroinflammatory cascade, which seems to be involved in every phase of stroke-related neuronal damage. Two weeks after transient middle cerebral artery occlusion (MCAO), vehicle-treated rats displayed higher numbers of total ionized calcium-binding adaptor molecule 1 (Iba-1)-positive cells, greater cell body areas of Iba-1-positive cells, and higher numbers of hypertrophic Iba-1-positive cells (with a cell body area over 80 μm2 ) in the ipsilateral ischemic brain regions including the frontal cortex, striatum, and parietal cortex...
November 2017: Cell Transplantation
https://www.readbyqxmd.com/read/29320537/correlation-of-a-new-index-reflecting-the-fluctuation-of-parasympathetic-tone-and-fetal-acidosis-in-an-experimental-study-in-a-sheep-model
#12
C Garabedian, Y Clermont-Hama, D Sharma, E Aubry, L Butruille, P Deruelle, L Storme, J De Jonckheere, V Houfflin-Debarge
The autonomic nervous system plays a leading role in the control of fetal homeostasis. Fetal heart rate variability (HRV) analysis is a reflection of its activity. We developed a new index (the Fetal Stress Index, FSI) reflecting parasympathetic tone. The objective of this study was to evaluate this index as a predictor of fetal acid-base status. This was an experimental study on chronically instrumented fetal lambs (n = 11, surgery at 128 +/- 2 days gestational age, term = 145 days). The model was based on 75% occlusion of the umbilical cord for a maximum of 120 minutes or until an arterial pH ≤ 7...
2018: PloS One
https://www.readbyqxmd.com/read/29315570/evolving-changes-in-fetal-heart-rate-variability-and-brain-injury-after-hypoxia-ischaemia-in-preterm-fetal-sheep
#13
Kyohei Yamaguchi, Christopher A Lear, Michael J Beacom, Tomoaki Ikeda, Alistair J Gunn, Laura Bennet
KEY POINTS: Fetal heart rate variability is a critical index of fetal wellbeing. Suppression of heart rate variability may provide prognostic information on the risk of hypoxic-ischaemic brain injury after birth. In the present study, we report the evolution of fetal heart rate variability after both mild and severe hypoxia-ischaemia. Both mild and severe hypoxia-ischaemia were associated with an initial, brief suppression of multiple measures of heart rate variability. This was followed by normal or increased levels of heart rate variability during the latent phase of injury...
January 8, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29239485/comparison-of-umbilical-cord-occlusion-methods-radiofrequency-ablation-versus-laser-photocoagulation
#14
Mira Abdel-Sattar, Andrew H Chon, Arlyn Llanes, Lisa M Korst, Joseph G Ouzounian, Ramen H Chmait
OBJECTIVE: To compare outcomes between 2 umbilical cord occlusion (UCO) methods: radiofrequency ablation (RFA) versus fetoscopic-guided laser photocoagulation. METHODS: Retrospective study of all monochorionic diamniotic multiple gestations that underwent UCO with RFA (preferred after 2014) or laser (preferred before 2014). In bivariate analysis, patients treated with RFA were compared with laser. Risk factors for intrauterine fetal demise (IUFD) and 30-day survival of the co-twin were identified, and multiple logistic models were fitted to examine whether the UCO method was associated with these outcomes...
January 2018: Prenatal Diagnosis
https://www.readbyqxmd.com/read/29211751/diffusion-tensor-imaging-detects-ventilation-induced-brain-injury-in-preterm-lambs
#15
Dhafer M Alahmari, Kyra Y Y Chan, Vanesa Stojanovska, Domenic LaRosa, Samantha K Barton, Ilias Nitsos, Valerie Zahra, Jade Barbuto, Michael Farrell, Shigeo Yamaoka, James T Pearson, Graeme R Polglase
PURPOSE: Injurious mechanical ventilation causes white matter (WM) injury in preterm infants through inflammatory and haemodynamic pathways. The relative contribution of each of these pathways is not known. We hypothesised that in vivo magnetic resonance imaging (MRI) can detect WM brain injury resulting from mechanical ventilation 24 h after preterm delivery. Further we hypothesised that the combination of inflammatory and haemodynamic pathways, induced by umbilical cord occlusion (UCO) increases brain injury at 24 h...
2017: PloS One
https://www.readbyqxmd.com/read/29186705/mesenchymal-stem-cell-treatment-prevents-post-stroke-dysregulation-of-matrix-metalloproteinases-and-tissue-inhibitors-of-metalloproteinases
#16
Bharath Chelluboina, Koteswara Rao Nalamolu, Gustavo G Mendez, Jeffrey D Klopfenstein, David M Pinson, David Z Wang, Krishna Kumar Veeravalli
BACKGROUND/AIMS: Stem cell treatment is one of the potential treatment options for ischemic stroke. We recently demonstrated a protective effect of human umbilical cord blood-derived mesenchymal stem cells (HUCB-MSCs) in a rat model of ischemic stroke. The treatment attenuated apoptosis and prevented DNA damage. A collection of published studies, including several from our laboratory, indicated the induction and detrimental role for several matrix metalloproteinases (MMPs) in post-stroke brain injury...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29175152/transplantation-of-human-umbilical-cord-blood-mononuclear-cells-attenuated-ischemic-injury-in-mcao-rats-via-inhibition-of-nf-%C3%AE%C2%BAb-and-nlrp3-inflammasome
#17
Lu Liu, Juan Cen, Yong Man, Jianbin Li, Dahuan Zhang, Fei Wang, Jinhua Li, Ji Ma, Xiaoming Wang, Biansheng Ji
Accumulated evidence displayed that transplantation of stem cells may be a promising approach for the treatment of neurological disorders. However, the underlying mechanisms remain to be well elucidated. Moreover, some investigators cannot reproduce similar results as the previous. The present results showed that transplantation of fresh human umbilical cord blood mononuclear cells (cbMNCs) attenuated ischemic damage in middle cerebral artery occlusion (MCAO) rats, accompanied with improvement of neurologic deficits, learning and memory function...
January 15, 2018: Neuroscience
https://www.readbyqxmd.com/read/29020780/-selective-feticide-in-monochorionic-twin-pregnancies-with%C3%A2-discordant-fetal-anomalies-management-and-outcome
#18
J Vojtěch, L Hašlík, R Pock, K Běhávková, K Macková, P Hanulíková, H Heřman, L Krofta
OBJECTIVE: To analyze results and outcome after selective feticide for discordant anomalies in monochorionic twins. DESIGN: Prospective cohort study. SETTING: Fetal medicine center, Institute for the Care of Mother and Child, Praha. METHODS: Analysis of outcome of monochorionic pregnancies after intrauterine surgery for structural abnormalities between January 2013 and June 2016. RESULTS: We performed 13 intrauterine operations in monochorionic twins with structural anomalies during the period...
2017: Ceská Gynekologie
https://www.readbyqxmd.com/read/29018332/the-beneficial-effects-of-melatonin-administration-following-hypoxia-ischemia-in-preterm-fetal-sheep
#19
Tamara Yawno, Mawin Mahen, Jingang Li, Michael C Fahey, Graham Jenkin, Suzanne L Miller
Melatonin (MLT) is an endogenous hormone that controls circadian cycle. MLT has additional important properties that make it appealing as a neuroprotective agent-it is a potent anti-oxidant, with anti-apoptotic and anti-inflammatory properties. MLT is safe for administration during pregnancy or to the newborn after birth, and can reduce white matter brain injury under conditions of chronic fetal hypoxia. Accordingly, in the current study, we examined whether an intermediate dose of MLT could restore white matter brain development when administered after an acute hypoxic ischemic (HI) insult in preterm fetal sheep...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28960438/evaluating-a-targeted-bedside-measure-of-cerebral-perfusion-in-a-nonhuman-primate-model-of-neonatal-hypoxic-ischemic-encephalopathy
#20
Eric S Peeples, Chikodinaka K Ezeokeke, Sandra E Juul, Pierre D Mourad
OBJECTIVES: To compare ultrasound-derived resistive indices (RIs) obtained at the level of the thalamus via fast Doppler ultrasound with traditional anterior cerebral artery measures in a model of neonatal hypoxic-ischemic encephalopathy and to correlate each with clinical outcomes. METHODS: Nine nonhuman primate neonates underwent no umbilical cord occlusion (n = 3), umbilical cord occlusion without hypothermia (n = 3), or umbilical cord occlusion with hypothermia (n = 3)...
April 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
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