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ischemic injury

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https://www.readbyqxmd.com/read/28231545/aqueous-extract-of-cortex-dictamni-protects-h9c2-cardiomyocytes-from-hypoxia-reoxygenation-induced-oxidative-stress-and-apoptosis-by-pi3k-akt-signaling-pathway
#1
Lin Li, Yunfeng Zhou, Yanlin Li, Lili Wang, Lan Sun, Lidong Zhou, Hiderori Arai, Yun Qi, Yang Xu
Ischemia-reperfusion injury is the major manifestation of ischemic heart disease, which facilitates cardiac arrhythmias, heart failure and death. Oxidative stress and apoptosis have been involved in the pathogenesis of myocardial ischemia-reperfusion injury. Modern pharmacological studies have indicated that the extracts and active compounds of Cortex Dictamni exhibit antioxidative and cardiovascular protective activities. This study was designed to investigate the protective effect of aqueous extract of Cortex Dictamni (CDAE) on regulating hypoxia/reoxygenation (H/R)-induced cardiomyocytes oxidative stress and apoptosis...
February 20, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28230931/spatially-assembled-bilayer-cell-sheets-of-stem-cells-and-endothelial-cells-using-thermosensitive-hydrogels-for-therapeutic-angiogenesis
#2
Indong Jun, Taufiq Ahmad, Seongwoo Bak, Joong-Yup Lee, Eun Mi Kim, Jinkyu Lee, Yu Bin Lee, Hongsoo Jeong, Hojeong Jeon, Heungsoo Shin
Although the coculture of multiple cell types has been widely employed in regenerative medicine, in vivo transplantation of cocultured cells while maintaining the hierarchical structure remains challenging. Here, a spatially assembled bilayer cell sheet of human mesenchymal stem cells and human umbilical vein endothelial cells on a thermally expandable hydrogel containing fibronectin is prepared and its effect on in vitro proangiogenic functions and in vivo ischemic injury is investigated. The expansion of hydrogels in response to a temperature change from 37 to 4 °C allows rapid harvest and delivery of the bilayer cell sheet to two different targets (an in vitro model glass surface and in vivo tissue)...
February 23, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28230856/ginsenoside-rg5-increases-cardiomyocyte-resistance-to-ischemic-injury-through-regulation-of-mitochondrial-hexokinase-ii-and-dynamin-related-protein-1
#3
Yi-Lin Yang, Jia Li, Kang Liu, Lei Zhang, Qun Liu, Baolin Liu, Lian-Wen Qi
Hexokinase-II (HK-II) and dynamin-related protein 1 (Drp1) regulate mitochondrial function differently. This study was designed to investigate the cardioprotective effect of ginsenoside Rg5 (Rg5) with emphasis on the regulation of mitochondrial HK-II and Drp1. Saturated acid palmitate (PA) stimulation increased lactate accumulation and induced cellular acidification by impairing the activity of pyruvate dehydrogenase (PDH) in cardiomyocytes, leading to HK-II dissociation from mitochondria. Rg5 improved PDH activity and prevented cellular acidification by combating fatty-acid oxidation, contributing to protecting mitochondrial HK-II...
February 23, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28230106/longitudinal-assessments-of-normal-and-perilesional-tissues-in-focal-brain-ischemia-and-partial-optic-nerve-injury-with-manganese-enhanced-mri
#4
Kevin C Chan, Iris Y Zhou, Stanley S Liu, Yolandi van der Merwe, Shu-Juan Fan, Victor K Hung, Sookja K Chung, Wu-Tian Wu, Kwok-Fai So, Ed X Wu
Although manganese (Mn) can enhance brain tissues for improving magnetic resonance imaging (MRI) assessments, the underlying neural mechanisms of Mn detection remain unclear. In this study, we used Mn-enhanced MRI to test the hypothesis that different Mn entry routes and spatiotemporal Mn distributions can reflect different mechanisms of neural circuitry and neurodegeneration in normal and injured brains. Upon systemic administration, exogenous Mn exhibited varying transport rates and continuous redistribution across healthy rodent brain nuclei over a 2-week timeframe, whereas in rodents following photothrombotic cortical injury, transient middle cerebral artery occlusion, or neonatal hypoxic-ischemic brain injury, Mn preferentially accumulated in perilesional tissues expressing gliosis or oxidative stress within days...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28229409/endothelial-progenitor-cells-procedure-for-cell-isolation-and-applications
#5
Garikipati V N Srikanth, Raj Kishore
Bone marrow endothelial progenitor cells (EPCs) have shown a great promise to promote ischemic tissue neovascularization and to attenuate ischemic injury in a variety of animal models, which led to EPC-based clinical trials that yielded modest but promising results. Some of the variables in the use of EPCs relate to their differential isolation and characterization protocols since the EPC literature does not identify a unique marker for these vascular progenitors. In this chapter, we present step-by-step protocols for the isolation of EPCs, their characterization and culture conditions, and their potential use in basic and clinical research...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28228483/new-concepts-and-mechanisms-of-platelet-activation-signaling
#6
REVIEW
Brian Estevez, Xiaoping Du
Upon blood vessel injury, platelets are exposed to adhesive proteins in the vascular wall and soluble agonists, which initiate platelet activation, leading to formation of hemostatic thrombi. Pathological activation of platelets can induce occlusive thrombosis, resulting in ischemic events such as heart attack and stroke, which are leading causes of death globally. Platelet activation requires intracellular signal transduction initiated by platelet receptors for adhesion proteins and soluble agonists. Whereas many platelet activation signaling pathways have been established for many years, significant recent progress reveals much more complex and sophisticated signaling and amplification networks...
March 2017: Physiology
https://www.readbyqxmd.com/read/28228367/blockade-of-hmgb1-preserves-vascular-homeostasis-and-improves-blood-perfusion-in-rats-of-acute-limb-ischemia-reperfusion
#7
Yang Liu, Changyou Zhou, Jianjun Jiang, Qingbo Su, Xiangjiu Ding
Acute limb ischemia is one of the most common peripheral arterial disease, while surgical restoration of blood flow often results in ischemia/reperfusion (I/R) injury. Our previous study revealed the inflammation intensity in arterial tissue, characterized by expression of high mobility group box protein 1 (HMGB1), was contrary to the fluctuation of hemodynamics in reperfusion limbs in a rat model. This study meant to clarify the role of HMGB1 during this process. Laser Doppler perfusion imaging evaluated limb hemodynamics in mean and max perfusion unit (PU)...
February 19, 2017: Microvascular Research
https://www.readbyqxmd.com/read/28228000/c60-fullerene-as-promising-therapeutic-agent-for-the-prevention-and-correction-of-skeletal-muscle-functioning-at-ischemic-injury
#8
D M Nozdrenko, D O Zavodovskyi, T Yu Matvienko, S Yu Zay, K I Bogutska, Yu I Prylutskyy, U Ritter, P Scharff
The therapeutic effect of pristine C60 fullerene aqueous colloid solution (C60FAS) on the functioning of the rat soleus muscle at ischemic injury depending on the time of the general pathogenesis of muscular system and method of administration C60FAS in vivo was investigated. It was found that intravenous administration of C60FAS is the optimal for correction of speed macroparameters of contraction for ischemic muscle damage. At the same time, intramuscular administration of C60FAS shows pronounced protective effect in movements associated with the generation of maximum force responses or prolonged contractions, which increase the muscle fatigue level...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28226873/using-hilbert-huang-transform-to-assess-eeg-slow-wave-activity-during-anesthesia-in-post-cardiac-arrest-patients
#9
Jukka Kortelainen, Eero Vayrynen, Usko Huuskonen, Jouko Laurila, Juha Koskenkari, Janne T Backman, Seppo Alahuhta, Tapio Seppanen, Tero Ala-Kokko, Jukka Kortelainen, Eero Vayrynen, Usko Huuskonen, Jouko Laurila, Juha Koskenkari, Janne T Backman, Seppo Alahuhta, Tapio Seppanen, Tero Ala-Kokko, Eero Vayrynen, Janne T Backman, Jukka Kortelainen, Tapio Seppanen, Jouko Laurila, Usko Huuskonen, Seppo Alahuhta, Tero Ala-Kokko, Juha Koskenkari
Hypoxic ischemic encephalopathy (HIE) is a severe consequence of cardiac arrest (CA) representing a substantial diagnostic challenge. We have recently designed a novel method for the assessment of HIE after CA. The method is based on estimating the severity of the brain injury by analyzing changes in the electroencephalogram (EEG) slow wave activity while the patient is exposed to an anesthetic drug propofol in a controlled manner. In this paper, Hilbert-Huang Transform (HHT) was used to analyze EEG slow wave activity during anesthesia in ten post-CA patients...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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
#10
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
#11
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/28225291/-a-contribution-to-the-differential-diagnostics-of-sclerosing-cholangitides
#12
Martin Blaho, Petr Dítě, Martina Bojková, Martin Rydlo, Tomáš Kupka, Pavel Svoboda, Pavel Klvaňa, Arnošt Martínek
Sclerosing cholangitides represent a group of chronic biliary obstructive diseases which include primary sclerosing cholangitis (PSC), IgG4 associated sclerosing cholangitis (IgG4-SC) and secondary sclerosing cholangitis (SSC). The manifestations of the diseases are similar, but their asymptomatic course is also frequent. IgG4-SC belongs to the group of IgG4 associated diseases and it is the most frequently related to type 1 autoimmune pancreatitis. Diagnosing of IgG4-SC is based on typical histopathological images, shape changes revealed by diagnostic imaging, serological tests, concurrent impairment of other organs and response to therapy, where IgG4-SC responds well to treatment with corticoids, whereas the only possibility for the remaining units is endoscopic intervention or liver transplantation...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/28223917/gene-expression-profiling-in-the-injured-spinal-cord-of-trachemys-scripta-elegans-an-amniote-with-self-repair-capabilities
#13
Adrián Valentin-Kahan, Gabriela B García-Tejedor, Carlos Robello, Omar Trujillo-Cenóz, Raúl E Russo, Fernando Alvarez-Valin
Slider turtles are the only known amniotes with self-repair mechanisms of the spinal cord that lead to substantial functional recovery. Their strategic phylogenetic position makes them a relevant model to investigate the peculiar genetic programs that allow anatomical reconnection in some vertebrate groups but are absent in others. Here, we analyze the gene expression profile of the response to spinal cord injury (SCI) in the turtle Trachemys scripta elegans. We found that this response comprises more than 1000 genes affecting diverse functions: reaction to ischemic insult, extracellular matrix re-organization, cell proliferation and death, immune response, and inflammation...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28223727/remote-ischemic-perconditioning-prevents-liver-transplantation-induced-ischemia-reperfusion-injury-in-rats-role-of-ros-rns-and-enos
#14
Ning He, Jun-Jun Jia, Jian-Hui Li, Yan-Fei Zhou, Bing-Yi Lin, Yi-Fan Peng, Jun-Jie Chen, Tian-Chi Chen, Rong-Liang Tong, Li Jiang, Hai-Yang Xie, Lin Zhou, Shu-Sen Zheng
AIM: To investigate the underlying mechanisms of the protective role of remote ischemic perconditioning (RIPerC) in rat liver transplantation. METHODS: Sprague-Dawley rats were subjected to sham, orthotopic liver transplantation (OLT), ischemic postconditioning (IPostC) or RIPerC. After 3 h reperfusion, blood samples were taken for measurement of alanine aminotransferase, aspartate aminotransferase, creatinine (Cr) and creatinine kinase-myocardial band (CK-MB). The liver lobes were harvested for the following measurements: reactive oxygen species (ROS), H2O2, mitochondrial membrane potential (ΔΨm) and total nitric oxide (NO)...
February 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28223241/transcriptomic-analysis-reveals-differential-activation-of-microglial-genes-after-ischemic-stroke-in-mice
#15
Akbar Khan, Furong Ju, Wenguang Xie, Muhammad Tariq Hafeez, Xiaofeng Cheng, Zhijie Yang, Lirui Zhu, Ting Li, Shengxiang Zy
Microglia are immune cells in the brain and play a pivotal role in the progression of ischemic injury, but the gene expression and signaling pathways related to the activation of microglia following ischemia remain unclear. In our experiment, we used digital gene expression (DGE) analysis to profile the transcriptome of ischemic tissue in a photothrombosis model. DGE analysis identified that a total of 749 genes were differentially regulated (643 up-regulated and 106 down-regulated) after 2 days and 7 days following stroke...
February 18, 2017: Neuroscience
https://www.readbyqxmd.com/read/28222779/magnetic-resonance-imaging-for-cerebral-lesions-during-minimal-invasive-mitral-valve-surgery-study-protocol-for-a-randomized-controlled-trial
#16
Cristina Barbero, Davide Ricci, Erik Cura Stura, Augusto Pellegrini, Giovanni Marchetto, Suad ElQarra, Massimo Boffini, Roberto Passera, Maria Consuelo Valentini, Mauro Rinaldi
BACKGROUND: Recent data have highlighted a higher rate of neurological injuries in minimal invasive mitral valve surgery (MIMVS) compared with the standard sternotomy approach; therefore, the role of specific clamping techniques and perfusion strategies on the occurrence of this complication is a matter of discussion in the medical literature. The purpose of this trial is to prospectively evaluate major, minor and silent neurological events in patients undergoing right mini-thoracotomy mitral valve surgery using retrograde perfusion and an endoaortic clamp or a transthoracic clamp...
February 21, 2017: Trials
https://www.readbyqxmd.com/read/28222567/immune-biomarkers-for-the-diagnosis-of-mild-traumatic-brain-injury
#17
Ashley B Petrone, Valerie Gionis, Richard Giersch, Taura L Barr
BACKGROUND: In 2010, there were approximately 2.2 million emergency room visits associated with traumatic brain injury (TBI), with 80 percent diagnosed as mild TBI or concussion. In addition, there are a large number of TBIs, especially mild TBIs, which go either unreported by patients or initially undiagnosed by clinicians. Our team has previously identified a panel of immune-related genes that can diagnose ischemic stroke at triage, and due to shared pathophysiological mechanisms of TBI and stroke, we hypothesized that this panel of genes may also be utilized for the diagnosis of TBI...
February 10, 2017: NeuroRehabilitation
https://www.readbyqxmd.com/read/28222320/antioxidant-polymorphisms-do-not-influence-the-risk-of-epilepsy-or-its-drug-resistance-after-neonatal-hypoxic-ischemic-brain-injury
#18
Katarina Esih, Katja Goričar, Vita Dolžan, Zvonka Rener-Primec
PURPOSE: The aim of this study was to investigate if common functional antioxidant polymorphisms are associated with epilepsy after neonatal hypoxic-ischemic encephalopathy (HIE). The antioxidant enzymes manganese superoxide dismutase (SOD2), glutathione peroxidase 1 (GPX1) and catalase (CAT) represent the primary defence mechanism against reactive oxygen species (ROS). Evidence suggests that genetic variants in antioxidant enzymes could influence susceptibility to epilepsy, but to date the relationship between them remains unclear...
February 3, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28222226/arctic-ground-squirrel-hippocampus-tolerates-oxygen-glucose-deprivation-independent-of-hibernation-season-even-when-not-hibernating-and-after-atp-depletion-acidosis-and-glutamate-efflux
#19
Saurav Bhowmick, Jeanette T Moore, Daniel L Kirschner, Kelly L Drew
Cerebral ischemia/reperfusion (I/R) triggers a cascade of uncontrolled cellular processes that perturb cell homeostasis. The arctic ground squirrel (AGS), a seasonal hibernator resists brain damage following cerebral I/R caused by cardiac arrest and resuscitation. However, it remains unclear if tolerance to I/R injury in AGS depends on the hibernation season. Moreover, it is also not clear if events such as depletion of ATP, acidosis and glutamate efflux that are associated with anoxic depolarization are attenuated in AGS...
February 21, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28222055/ex-situ-perfusion-of-human-limb-allografts-for-24-hours
#20
Nicole L Werner, Fares Alghanem, Stephanie L Rakestraw, Dylan C Sarver, Bruce Nicely, Richard E Pietroski, Paul Lange, Steven M Rudich, Christopher L Mendias, Alvaro Rojas-Pena, John C Magee, Robert H Bartlett, Kagan Ozer
BACKGROUND: Vascularized composite allografts, particularly hand and forearm, have limited ischemic tolerance after procurement. In bilateral hand transplantations, this demands a 2 team approach and expedited transfer of the allograft, limiting the recovery to a small geographic area. Ex situ perfusion may be an alternative allograft preservation method to extend allograft survival time. This is a short report of 5 human limbs maintained for 24 hours with ex situ perfusion. METHODS: Upper limbs were procured from brain-dead organ donors...
March 2017: Transplantation
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