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Oxidant stress, stroke

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https://www.readbyqxmd.com/read/27924073/diagnostic-performance-of-peroxiredoxin-1-to-determine-time-of-onset-of-acute-cerebral-infarction
#1
Sébastien Richard, Vanessa Lapierre, Nicolas Girerd, Mathieu Bonnerot, Pierre R Burkhard, Linnéa Lagerstedt, Serge Bracard, Marc Debouverie, Natacha Turck, Jean-Charles Sanchez
Accurately determining time-of-onset of cerebral infarction is important to clearly identify patients who could benefit from reperfusion therapies. We assessed the kinetics of peroxiredoxin 1 (PRDX1), a protein involved in oxidative stress during the acute phase of ischemia, and its ability to determine stroke onset in a population of patients with known onset of less than 24 hours and in a control group. Median PRDX1 levels were significantly higher in stroke patients compared to controls. PRDX1 levels were also higher from blood samples withdrawn before vs...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27919823/nerve-growth-factor-carbon-nanotube-complex-exerts-prolonged-protective-effects-in-an-in-vitro-model-of-ischemic-stroke
#2
Parichehr Hassanzadeh, Elham Arbabi, Fatemeh Atyabi, Rassoul Dinarvand
AIMS: The therapeutic potential of nerve growth factor (NGF) against the neurological disorders may be negatively affected by its short half-life. Based on the superior properties of carbon nanotubes (CNTs) for controlled drug delivery, we aimed to prepare CNT-NGF complex and evaluate its effect in an in vitro model of ischemic stroke. MATERIALS AND METHODS: Multi-walled CNTs (MWCNTs)-NGF complex was prepared using amino-functionalized COOH-MWCNTs and characterized by Fourier transform infrared spectroscopy and transmission electron microscopy...
December 2, 2016: Life Sciences
https://www.readbyqxmd.com/read/27914011/activation-of-alpha-7-nicotinic-acetylcholine-receptor-reduces-brain-edema-in-mice-with-ischemic-stroke-and-bone-fracture
#3
Dingquan Zou, Man Luo, Zhenying Han, Lei Zhan, Wan Zhu, Shuai Kang, Chen Bao, Zhao Li, Jeffrey Nelson, Rui Zhang, Hua Su
Stroke is an important risk factor for bone fracture. We showed previously that bone fracture at the acute stage of ischemic stroke worsens, and activation of α-7 nicotinic acetylcholine receptor (α-7 nAchR) improves, stroke recovery by attenuating inflammation. We hypothesized that activation of α-7 nAchR also improves the blood-brain barrier (BBB) integrity. Permanent distal middle cerebral artery occlusion (pMCAO) was performed on C57BL/6J mice followed by tibia fracture 1 day later. Mice were treated with 0...
December 2, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27905989/the-histone-deacetylase-inhibitor-sodium-butyrate-exhibits-neuroprotective-effects-for-ischemic-stroke-in-middle-aged-female-rats
#4
Min Jung Park, Farida Sohrabji
BACKGROUND: Sodium butyrate (NaB) is a histone deacetylase (HDAC) inhibitor exhibiting anti-inflammatory and neuroprotective effects in a rat ischemic model of stroke as well as a myocardial ischemia model. Although clinical evidence shows that older women are at higher risk for stroke occurrence and greater stroke severity, no studies have evaluated the effectiveness of NaB either in females or in older animals. METHODS: To determine the effects of NaB on stroke in older females, acyclic middle-aged Sprague-Dawley female rats (9-11 months old, constant diestrus) were subject to middle cerebral artery occlusion (MCAo) by intracerebral injection of recombinant endothelin-1...
December 1, 2016: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/27905388/-prognostic-biochemical-markers-of-thrombolytic-therapy-in-ischemic-stroke
#5
O A Kicherova, L I Reikhert, V G Skorikova, S A Semeshko
AIM: To assess prognostic value of endothelial dysfunction, endogenous intoxication and oxidative stress in the acute period of ischemic stroke (II) at the stage of making a decision on using thrombolytic therapy (TLT) as well during the follow-up in order to personalize treatment. MATERIAL AND METHODS: The study included 57 patients stratified into control group 1 (n=29) and TLT group (n=28). Contents of C-reactive protein (Nsrb), matrixmetalloproteinase-9 (MMP-9) erythrocyte lipid peroxidation products were measured in the blood of patients...
2016: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/27905384/-oxidative-stress-as-an-indicator-of-metabolic-disorders-in-the-pathogenesis-of-cerebral-stroke
#6
M A Lutsky, A M Zemskov, V V Razuvaeva, Yu P Lushnikova, O Yu Karpova
AIM: To verify the oxidative stress as an indicator of metabolic disorders in the complex pathogenesis of hemorrhagic and ischemic stroke. MATERIAL AND METHODS: The study included 50 hemorrhagic stroke patients and 50 ischemic stroke patients. A control group consisted of 20 age-matched healthy subjects. In total 12 biochemical parameters, including blood indicators, indicators of free-radical oxidation (ketodiens, diene conjugates, malonic aldehyde, bityrosin, Schiff bases) and endogenous system antioxidant defense (vitamin E, reduced glutathione, total antioxidative activity, superoxide dismutase, glutathione peroxidase, glutathione reductase, catalase) were determined...
2016: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/27904035/reduced-production-of-hydrogen-sulfide-and-sulfane-sulfur-due-to-low-cystathionine-%C3%AE-synthase-levels-in-brain-astrocytes-of-stroke-prone-spontaneously-hypertensive-rats
#7
Sachiko Juman, Yasuo Nara, Naomi Yasui, Hiroko Negishi, Hiroto Okuda, Nichika Takado, Tomohiro Miki
Stroke-prone spontaneously hypertensive rats (SHRSP/Izm; SHRSP) develop severe hypertension and die of cerebral stroke. However, the genetic mechanisms underlying their stroke susceptibility have not been clarified yet. In this study, we used astrocytes from the newborn brain cortex of spontaneously hypertensive rats (SHR/Izm; SHR) and SHRSP to find the difference of genetic characteristics. Astrocytes are known to have functions of vasodilation and nutrient uptake for neurons in the brain. The continuous generation of hydrogen peroxide (H2O2) dose-dependently causes cell death in astrocytes, and SHRSP was more vulnerable than SHR...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27899755/association-of-oxidized-low-density-lipoprotein-with-prognosis-of-stroke-and-stroke-subtypes
#8
Anxin Wang, Yuling Yang, Zhaoping Su, Wei Yue, Hongjun Hao, Lijie Ren, Yongjun Wang, Yibin Cao, Yilong Wang
BACKGROUND AND PURPOSE: The association between oxidized low-density lipoprotein (oxLDL) and the long-term prognosis of stroke is unclear. The aim of this study is to investigate whether oxLDL levels contribute to the prognosis of stroke and stroke subtypes. METHODS: All patients with ischemic stroke were recruited from the SOS-Stroke (Study of Oxidative Stress in Patients With Acute Ischemic Stroke) and classified into 5 different subtypes, according to the TOAST criteria (Trial of Org 10172 in Acute Stroke Treatment)...
November 29, 2016: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/27898011/update-on-inflammatory-biomarkers-and-treatments-in-ischemic-stroke
#9
REVIEW
Aldo Bonaventura, Luca Liberale, Alessandra Vecchié, Matteo Casula, Federico Carbone, Franco Dallegri, Fabrizio Montecucco
After an acute ischemic stroke (AIS), inflammatory processes are able to concomitantly induce both beneficial and detrimental effects. In this narrative review, we updated evidence on the inflammatory pathways and mediators that are investigated as promising therapeutic targets. We searched for papers on PubMed and MEDLINE up to August 2016. The terms searched alone or in combination were: ischemic stroke, inflammation, oxidative stress, ischemia reperfusion, innate immunity, adaptive immunity, autoimmunity...
November 25, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27896650/neuroprotection-by-chlorpromazine-and-promethazine-in-severe-transient-and-permanent-ischemic-stroke
#10
Xiaokun Geng, Fengwu Li, James Yip, Changya Peng, Omar Elmadhoun, Jiamei Shen, Xunming Ji, Yuchuan Ding
Previous studies have demonstrated depressive or hibernation-like roles of phenothiazine neuroleptics [combined chlorpromazine and promethazine (C + P)] in brain activity. This ischemic stroke study aimed to establish neuroprotection by reducing oxidative stress and improving brain metabolism with post-ischemic C + P administration. Sprague-Dawley rats were subjected to transient (2 or 4 h) middle cerebral artery occlusion (MCAO) followed by 6 or 24 h reperfusion, or permanent (28 h) MCAO without reperfusion...
November 28, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27889229/brown-propolis-attenuates-cerebral-ischemia-induced-oxidative-damage-via-affecting-antioxidant-enzyme-system-in-mice
#11
Gholamreza Bazmandegan, Mohammad Taher Boroushaki, Ali Shamsizadeh, Fatemeh Ayoobi, Elham Hakimizadeh, Mohammad Allahtavakoli
Oxidative stress plays a critical role in ischemic brain injury. Superoxide dismutase (SOD) and glutathione peroxidase (GPx) are the enzymes underlying the endogenous antioxidant mechanisms affected by stroke and are considered as oxidative stress biomarkers. Brown propolis (BP) is a bioactive natural product with a set of biological activities that in turn may differ depending on the area from which the substance is originated. The aim of this study was to investigate the effect of water-extracted brown propolis (WEBPs), from two regions of Iran, against cerebral ischemia-induced oxidative injury in a mouse model of stroke...
November 23, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27876573/stem-cell-therapies-in-age-related-neurodegenerative-diseases-and-stroke
#12
REVIEW
Yuan Wang, Xunming Ji, Rehana K Leak, Fenghua Chen, Guodong Cao
Aging, a complex process associated with various structural, functional and metabolic changes in the brain, is an important risk factor for neurodegenerative diseases and stroke. These diseases share similar neuropathological changes, such as the formation of misfolded proteins, oxidative stress, loss of neurons and synapses, dysfunction of the neurovascular unit (NVU), reduction of self-repair capacity, and motor and/or cognitive deficiencies. In addition to gray matter dysfunction, the plasticity and repair capacity of white matter also decrease with aging and contribute to neurodegenerative diseases...
November 19, 2016: Ageing Research Reviews
https://www.readbyqxmd.com/read/27867477/hyperbaric-oxygen-therapy-in-experimental-and-clinical-stroke
#13
REVIEW
Wei-Wei Zhai, Liang Sun, Zheng-Quan Yu, Gang Chen
Stroke, which is defined as a neurologic deficit caused by sudden impaired blood supply, has been considered as a common cause of death and disability for decades. The World Health Organization has declared that almost every 5 seconds a new stroke occurs, placing immense socioeconomic burdens. However, the effective and available treatment strategies are still limited. Additionally, the most effective therapy, such as thrombolysis and stenting for ischemic stroke, generally requires a narrow therapeutic time window after the event...
April 2016: Medical Gas Research
https://www.readbyqxmd.com/read/27864733/-epicatechin-a-natural-flavonoid-compound-protects-astrocytes-against-hemoglobin-toxicity-via-nrf2-and-ap-1-signaling-pathways
#14
Xi Lan, Xiaoning Han, Qian Li, Jian Wang
(-)-Epicatechin is a brain-permeable, natural product found at high concentrations in green tea and cocoa. Our previous research has shown that (-)-epicatechin treatment reduces hemorrhagic stroke injury via nuclear factor erythroid 2-related factor 2 (Nrf2) signaling pathway in vivo. However, the mechanism of action of this compound in modulation of oxidant stress and in protection against hemoglobin-induced astrocyte injury is unclear. Therefore, we explored the cellular and molecular mechanisms that underlie these protective effects in vitro...
November 18, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27863840/long-term-pre-treatment-of-antioxidant-ginkgo-biloba-extract-egb-761-attenuates-cerebral-ischemia-induced-neuronal-damage-in-aged-mice
#15
Xiaomei Zhou, Yinliang Qi, Ting Chen
Antioxidant activity has been attributed to the neuroprotective effects of Ginkgo biloba extract EGb-761 on brain disorders including ischemic stroke. It is suggested that oxidative stress implicates in neuron injuries during aging. However, whether or not EGb-761 could be used to treat age-related cerebral ischemia is unclear. In the present study, we directly studied the protective effects of EGb-761 in brain ischemia in the mice with different age. As expected, the recovery from brain damages was impaired in aged mice (24 months) in an animal model of middle cerebral artery occlusion (MCAO)...
November 15, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27856285/neurotrophic-and-neuroprotective-effects-of-oxyntomodulin-in-neuronal-cells-and-a-rat-model-of-stroke
#16
Yazhou Li, Kou-Jen Wu, Seong-Jin Yu, Ian A Tamargo, Yun Wang, Nigel H Greig
Proglucagon-derived peptides, especially glucagon-like peptide-1 (GLP-1) and its long-acting mimetics, have exhibited neuroprotective effects in animal models of stroke. Several of these peptides are in clinical trials for stroke. Oxyntomodulin (OXM) is a proglucagon-derived peptide that co-activates the GLP-1 receptor (GLP-1R) and the glucagon receptor (GCGR). The neuroprotective action of OXM, however, has not been thoroughly investigated. In this study, the neuroprotective effect of OXM was first examined in human neuroblastoma (SH-SY5Y) cells and rat primary cortical neurons...
November 14, 2016: Experimental Neurology
https://www.readbyqxmd.com/read/27836629/mitochondrial-dysfunction-and-oxidative-stress-in-metabolic-disorders-a-step-towards-mitochondria-based-therapeutic-strategies
#17
REVIEW
Jasvinder Singh Bhatti, Gurjit Kaur Bhatti, P Hemachandra Reddy
Mitochondria are the powerhouses of the cell and are involved in essential functions of the cell, including ATP production, intracellular Ca(2+) regulation, reactive oxygen species production & scavenging, regulation of apoptotic cell death and activation of the caspase family of proteases. Mitochondrial dysfunction and oxidative stress are largely involved in aging, cancer, age-related neurodegenerative and metabolic syndrome. In the last decade, tremendous progress has been made in understanding mitochondrial structure, function and their physiology in metabolic syndromes such as diabetes, obesity, stroke and hypertension, and heart disease...
November 9, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27834147/sestrins-a-new-kid-for-stroke-treatment
#18
John H Zhang, Xudan Shi, Liang Xu, Jay Malagult, Jiping Tang, Min Yan
The sestrin family includes several conserved stress-induced proteins that contribute to the maintenance of homeostasis, DNA stability and cell viability in response to various types of injuries. It is well established that the protective functions of AMP-dependent protein kinase (AMPK) and/or mammalian target of rapamycin (mTOR) are regulated by sestrins. Additionally, it has been revealed that sestrins are able to protect cells from oxidative stress by scavenging reactive oxygen species (ROS). The essential involvement of sestrins in mTORC1 inhibition and ROS scavenging signaling pathway, which modulate metabolism homeostasis and regulate autophagy, indicates that sestrins may serve as a potential agent for cell growth, development, metabolism, and neurodegenerative disorders...
November 11, 2016: Current Drug Delivery
https://www.readbyqxmd.com/read/27834125/role-of-ageing-and-oxidative-stress-in-regulation-of-amyloid-degrading-enzymes-and-development-of-neurodegeneration
#19
Natalia N Nalivaeva, Anthony J Turner
The accumulation of cerebral amyloid β-peptide (Aβ) is a key precipitating factor for neuronal cell death in Alzheimer's disease (AD). However, brain Aβ levels are modifiable since there is a balance between its formation from the amyloid precursor protein (APP) and its removal by clearance mechanisms, which can be either through proteolysis or by protein binding and subsequent transport). Among the major enzymes degrading brain Aβ are several zinc-proteases: neprilysin (NEP), its homologues NEP2 and the endothelin converting enzymes (ECE-1 and -2) and also the insulin-degrading enzyme (IDE)...
November 10, 2016: Current Aging Science
https://www.readbyqxmd.com/read/27826423/hydrogen-therapy-from-mechanism-to-cerebral-diseases
#20
REVIEW
Cheng-Lin Liu, Kai Zhang, Gang Chen
The medicinal value of hydrogen (H2) was ignored prior to research illustrating that inhalation of 2% H2 can significantly decrease the damage of cerebral ischemia/reperfusion caused by oxidative stress via selective elimination of hydroxyl freebase (OH) and peroxynitrite anion (ONOO-). Subsequently, there have been numerous experiments on H2. Most research and trials involving the mechanisms underlying H2 therapy show the effects of antioxygenation, anti-inflammation, and anti-apoptosis. Among quantities of diseases related with H2 therapy, the brain disease is a hotspot as brain tissue and cell damage are easier to be induced by oxidative stress and other stimulations...
March 2016: Medical Gas Research
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