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Oxidant stress, stroke

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https://www.readbyqxmd.com/read/28928373/a-synthetic-cell-permeable-antioxidant-protects-neurons-against-acute-oxidative-stress
#1
Nicola J Drummond, Nick O Davies, Janet E Lovett, Mark R Miller, Graeme Cook, Thomas Becker, Catherina G Becker, Donald B McPhail, Tilo Kunath
Excessive reactive oxygen species (ROS) can damage proteins, lipids, and DNA, which result in cell damage and death. The outcomes can be acute, as seen in stroke, or more chronic as observed in age-related diseases such as Parkinson's disease. Here we investigate the antioxidant ability of a novel synthetic flavonoid, Proxison (7-decyl-3-hydroxy-2-(3,4,5-trihydroxyphenyl)-4-chromenone), using a range of in vitro and in vivo approaches. We show that, while it has radical scavenging ability on par with other flavonoids in a cell-free system, Proxison is orders of magnitude more potent than natural flavonoids at protecting neural cells against oxidative stress and is capable of rescuing damaged cells...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915226/pulmonary-vascular-function-and-aerobic-exercise-capacity-at-moderate-altitude
#2
Vitalie Faoro, Gael Deboeck, Marco Vicenzi, Anne-Fleur Gaston, Bamodi Simaga, Grégory Doucende, Ilona Hapkova, Emma Roca, Enric Subirats, Fabienne Durand, Robert Naeije
PURPOSE: There has been suggestion that a greater "pulmonary vascular reserve" defined by a low pulmonary vascular resistance (PVR) and a high lung diffusing capacity (DL) allow for a superior aerobic exercise capacity. How pulmonary vascular reserve might affect exercise capacity at moderate altitude is not known. METHODS: Thirty-eight healthy subjects underwent an exercise stress echocardiography of the pulmonary circulation, combined with measurements of DL for nitric oxide (NO) and carbon monoxide (CO) and a cardiopulmonary exercise test at sea level and at an altitude of 2250 m...
October 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28914132/reverse-electron-transfer-results-in-a-loss-of-flavin-from-mitochondrial-complex-i-potential-mechanism-for-brain-ischemia-reperfusion-injury
#3
Anna Stepanova, Anja Kahl, Csaba Konrad, Vadim Ten, Anatoly S Starkov, Alexander Galkin
Ischemic stroke is one of the most prevalent sources of disability in the world. The major brain tissue damage takes place upon the reperfusion of ischemic tissue. Energy failure due to alterations in mitochondrial metabolism and elevated production of reactive oxygen species (ROS) is one of the main causes of brain ischemia-reperfusion (IR) damage. Ischemia resulted in the accumulation of succinate in tissues, which favors the process of reverse electron transfer (RET) when a fraction of electrons derived from succinate is directed to mitochondrial complex I for the reduction of matrix NAD(+)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28912645/anti-inflammatory-effect-of-glucagon-like-peptide-1-receptor-agonist-exendin-4-through-modulation-of-ib1-jip1-expression-and-jnk-signaling-in-stroke
#4
Soojin Kim, Jaewon Jeong, Hye-Seon Jung, Bokyung Kim, Ye-Eun Kim, Da-Sol Lim, So-Dam Kim, Yun Seon Song
Glucagon like peptide-1 (GLP-1) stimulates glucose-dependent insulin secretion. Dipeptidyl peptidase-4 (DPP-4) inhibitors, which block inactivation of GLP-1, are currently in clinical use for type 2 diabetes mellitus. Recently, GLP-1 has also been reported to have neuroprotective effects in cases of cerebral ischemia. We therefore investigated the neuroprotective effects of GLP-1 receptor (GLP-1R) agonist, exendin-4 (ex-4), after cerebral ischemia-reperfusion injury. Transient middle cerebral artery occlusion (tMCAO) was induced in rats by intracerebroventricular (i...
August 2017: Experimental Neurobiology
https://www.readbyqxmd.com/read/28904308/aging-modulates-the-substrate-and-triggers-remodeling-in-atrial-fibrillation
#5
Yung-Kuo Lin, Yi-Ann Chen, Ting-I Lee, Yao-Chang Chen, Shih-Ann Chen, Yi-Jen Chen
Aging plays a critical role in the genesis of atrial fibrillation (AF) and also increases the risks of cardiac dysfunction and stroke in AF patients. AF is caused by increased AF triggering from abnormalities of the thoracic vein and/or modulated substrate (atrial) with enhancement of AF maintenance. Clinical and laboratory evidence indicates that aging is significant in the creation of atrial electrical and structural remodeling that leads to increased susceptibility to AF occurrence. Aging is commonly associated with cardiovascular comorbidities, oxidative stress, calcium dysregulation, atrial myopathy with apoptosis, and fibrosis, which all contribute to the genesis of AF...
September 14, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28894512/treatment-effects-of-ischemic-stroke-by-berberine-baicalin-and-jasminoidin-from-huang-lian-jie-du-decoction-hljdd-explored-by-an-integrated-metabolomics-approach
#6
Qian Zhang, Xiaowei Fu, Junsong Wang, Minghua Yang, Lingyi Kong
Berberine, baicalin, and jasminoidin were major active ingredients of Huang-Lian-Jie-Du-Decoction (HLJDD), a famous prescription of traditional Chinese medicine (TCM), which has been used for the treatment of ischemic stroke. The aim of the present study was to classify their roles in the treatment effects of ischemic stroke. A rat model of middle cerebral artery occlusion (MCAO) was constructed to mimic ischemic stroke and treatment effects of berberine, baicalin, and jasminoidin, and HLJDD was assessed by neurologic deficit scoring, infarct volume, histopathology, immunohistochemistry, biochemistry, quantitative real-time polymerase chain reaction (qRT-PCR), and Western blotting...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28878349/peptide-mediated-delivery-of-donor-mitochondria-improves-mitochondrial-function-and-cell-viability-in-human-cybrid-cells-with-the-melas-a3243g-mutation
#7
Jui-Chih Chang, Fredrik Hoel, Ko-Hung Liu, Yau-Huei Wei, Fu-Chou Cheng, Shou-Jen Kuo, Karl Johan Tronstad, Chin-San Liu
The cell penetrating peptide, Pep-1, has been shown to facilitate cellular uptake of foreign mitochondria but further research is required to evaluate the use of Pep-1-mediated mitochondrial delivery (PMD) in treating mitochondrial defects. Presently, we sought to determine whether mitochondrial transplantation rescue mitochondrial function in a cybrid cell model of mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) disease. Following PMD, recipient cells had internalized donor mitochondria after 1 h, and expressed higher levels of normal mitochondrial DNA, particularly at the end of the treatment and 11 days later...
September 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28872907/edaravone-and-its-clinical-development-for-amyotrophic-lateral-sclerosis
#8
Koji Takei, Kazutoshi Watanabe, Satoshi Yuki, Makoto Akimoto, Takeshi Sakata, Joseph Palumbo
The etiology of amyotrophic lateral sclerosis (ALS) is unknown. Oxidative stress may be one of the major mechanisms involved. In vitro and in vivo data of edaravone suggest that it may possess broad free radical scavenging activity and protect neurons, glia, and vascular endothelial cells against oxidative stress. During the 1980s and 1990s, edaravone was developed for the treatment of acute ischemic stroke. In 2001, a clinical program in ALS was initiated and five clinical studies were conducted in Japan. Phase III studies were designed to rapidly evaluate (within a 24-week double-blind study window) functional changes using the Revised ALS Functional Rating Scale (ALSFRS-R) as a primary endpoint...
October 2017: Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration
https://www.readbyqxmd.com/read/28870559/intranasal-deferoxamine-affects-memory-loss-oxidation-and-the-insulin-pathway-in-the-streptozotocin-rat-model-of-alzheimer-s-disease
#9
J M Fine, A C Forsberg, B M Stroebel, K A Faltesek, D R Verden, K A Hamel, E B Raney, J M Crow, L R Haase, K E Knutzen, K D Kaczmarczek, W H Frey, L R Hanson
Accumulation of metal and the accompanying increase in oxidative stress and inflammation plays an important role in neurodegenerative disease. Deferoxamine (DFO) is a metal chelator found to be beneficial in several animal models of neurodegenerative disease and insult including Alzheimer's disease, Parkinson's disease, stroke, and subarachnoid hemorrhage. In this study, we determine whether intranasally (IN) administered DFO is beneficial in the intracerebroventricular streptozotocin (ICV STZ) rat model of sporadic Alzheimer's disease, which is different from previous models in that it exhibits dysregulation of insulin metabolism as well as oxidative stress and inflammation...
September 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28861754/estrogen-receptor-%C3%AE-mediated-neuroprotective-efficacy-of-cicer-microphyllum-seed-extract-in-global-hypoxia
#10
Deepti Sharma, Surya Narayan Biswal, Kushal Kumar, Pushpendar Bhardwaj, Kalpana Kumari Barhwal, Ashish Kumar, Sunil Kumar Hota, Om Prakash Chaurasia
Hypoxia induced oxidative stress and neurodegeneration in the hippocampus has been implicated for memory impairment in conditions like stroke, ischemia and hypobaric hypoxia. The present study, aimed at investigating the potential of ethanolic extract of Cicer microphyllum seeds (CSE) for amelioration of global hypoxia induced neurodegeneration in CA1 region of hippocampus. CSE supplementation considerably reduced neurodegeneration and dendritic atrophy in CA1 neurons along with improvement of memory in hypoxic rats...
August 31, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28844957/adiponectin-attenuates-nadph-oxidase-mediated-oxidative-stress-and-neuronal-damage-induced-by-cerebral-ischemia-reperfusion-injury
#11
Xia Li, Hao Guo, Lei Zhao, Bodong Wang, Haixiao Liu, Liang Yue, Hao Bai, Haiyang Jiang, Li Gao, Dayun Feng, Yan Qu
Adiponectin (APN), which is a major adipokine that regulated glucose and lipid metabolism, plays an important role in the protection of the cerebral nervous system. It also has been suggested to have anti-inflammatory effects and ameliorate oxidative stress. Stroke is a universal cause of death and permanent disability. Ischemic stroke accounts for most cases of stroke, and is characterized by cerebral ischemia and neurological deficits. We aimed to investigate the effects of APN-peptide (APN-P) in neurons following ischemia reperfusion (I/R) in C57BL/6J mice, and to study the potential mechanisms underlying its effects...
August 24, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28842824/protein-modifications-with-ubiquitin-as-response-to-cerebral-ischemia-reperfusion-injury
#12
Karin Hochrainer
Post-translational protein modifications present an elegant and energy efficient way to dynamically reprogram cellular protein properties and functions in response to homeostatic imbalance. One such protein modification is the tagging of proteins with the small modifier ubiquitin that can have an impact on protein stability, localization, interaction dynamics, and function. Ubiquitination is vital to any eukaryotic cell under physiological conditions, but even more important under stress including oxidative, genotoxic, and heat stress, where ubiquitination levels are drastically increased...
August 25, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/28842715/high-serum-levels-of-malondialdehyde-and-8-ohdg-are-both-associated-with-early-cognitive-impairment-in-patients-with-acute-ischaemic-stroke
#13
Zhihua Liu, Yuntao Liu, Xinjie Tu, Huiping Shen, Huihua Qiu, Huijun Chen, Jincai He
Post-stroke cognitive impairment (PSCI) is an increasingly prevalent sequel after stroke that may associate with poor functional outcome and increased risk of recurrent stroke. We aimed to explore the relationship between oxidative stress biomarkers and the presence of PSCI. 193 first-ever acute ischaemic stroke patients were consecutively enrolled in the current study. The oxidative stress biomarkers malondialdehyde (MDA) and 8-hydroxydeoxyquanosine (8-OHdG) were measured within 24 h after admission. Cognition function was evaluated by the Mini-Mental State Examination (MMSE) at 1 month after stroke...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28842356/impact-of-micrornas-on-ischemic-stroke-from-pre-to-post-disease
#14
REVIEW
Guangwen Li, Kahlilia C Morris-Blanco, Mary S Lopez, Tuo Yang, Haiping Zhao, Raghu Vemuganti, Yumin Luo
Stroke is the number one cause of neurological dysfunction in adults and has a heavy socioeconomic burden worldwide. The etiological origins of ischemic stroke and resulting pathological processes are mediated by a multifaceted cascade of molecular mechanisms that are in part modulated by posttranscriptional activity. Accumulating evidence has revealed a role for microRNAs (miRNAs) as essential mediators of posttranscriptional gene silencing in both the physiology of brain development and pathology of ischemic stroke...
August 24, 2017: Progress in Neurobiology
https://www.readbyqxmd.com/read/28840449/from-mitochondrial-function-to-neuroprotection-an-emerging-role-for-methylene-blue
#15
REVIEW
Donovan Tucker, Yujiao Lu, Quanguang Zhang
Methylene blue (MB) is a well-established drug with a long history of use, owing to its diverse range of use and its minimal side effect profile. MB has been used classically for the treatment of malaria, methemoglobinemia, and carbon monoxide poisoning, as well as a histological dye. Its role in the mitochondria, however, has elicited much of its renewed interest in recent years. MB can reroute electrons in the mitochondrial electron transfer chain directly from NADH to cytochrome c, increasing the activity of complex IV and effectively promoting mitochondrial activity while mitigating oxidative stress...
August 24, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28838041/the-role-of-mineralocorticoid-receptor-signaling-in-the-cross-talk-between-adipose-tissue-and-the-vascular-wall
#16
Guanghong Jia, Annayya R Aroor, James R Sowers
Vascular dysfunction and impaired endothelial mediated relaxation are powerful underlying abnormalities in the pathogenesis of hypertension, coronary heart disease, and stroke. Obesity, type 2 diabetes mellitus, and other metabolic abnormalities are associated with activation of mineralocorticoid receptor (MRs) in the vasculature and adipose tissue. While MR signaling is involved in the normal physiological differentiation and maturation of adipocyte, enhanced activation of MRs also contributes to increase oxidative stress, release of pro-inflammatory adipokines, and dysregulation of adipocyte autophagy...
July 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28828929/prognostic-value-of-serum-thioredoxin-levels-in-ischemic-stroke
#17
Tieer Yu, Wanli Zhang, Yuanshao Lin, Qian Li, Jie Xue, Zhengyi Cai, Yifan Cheng, Bei Shao
OBJECTIVES: Thioredoxin (Trx) is one of significant antioxidative molecules to diminish oxidative stress. Current evidence suggests that Trx is a potent antioxidant with cytoprotective functions. The aim of our study was to investigate specifically the association between serum Trx levels and acute ischemic stroke (AIS) patients. METHODS: 198 AIS patients and 75 controls were enrolled to the study. Serum Trx levels were measured using an enzyme-linked immunosorbent assay (ELISA)...
August 22, 2017: Neurological Research
https://www.readbyqxmd.com/read/28826667/ecology-of-the-cardiovascular-system-a-focus-on-air-related-environmental-factors
#18
REVIEW
Jean François Argacha, T Bourdrel, P van de Borne
Cardiology is a newcomer to environmental sciences. We aim to propose an original review of the scientific evidence regarding the effects of the environment on cardiovascular health. We report first influences of air-related environmental factors. Air temperature has a strong influence on cardiovascular mortality characterized by a V-like relationship confirming that both cold and hot periods have negative cardiovascular impacts. Furthermore, dynamic changes in temperature are likely more important than the absolute air temperature level...
August 4, 2017: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28819157/a-preliminary-investigation-of-the-association-of-sleep-with-inflammation-and-oxidative-stress-biomarkers-and-functional-outcomes-after-stroke-rehabilitation
#19
Ting-Ting Yeh, Yu-Wei Hsieh, Ching-Yi Wu, Jong-Shyan Wang, Keh-Chung Lin, Chia-Ling Chen
This study examined the association of sleep with inflammation and oxidative stress biomarkers, and with functional outcomes, after stroke rehabilitation. The rehabilitation effects on biomarkers and functional outcomes were also evaluated. Twenty subacute stroke survivors received 4 weeks of upper limb rehabilitation. Baseline inflammatory (i.e., soluble intercellular adhesion molecule-1, sICAM-1) and oxidative stress biomarkers (i.e., glutathione peroxidase, GPx and malondialdehyde, MDA) were assessed, as were sleep outcomes...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28818262/brain-derived-neurotrophic-factor-mediates-cognitive-improvements-following-acute-exercise
#20
Andrew Borror
The mechanisms causing improved cognition following acute exercise are poorly understood. This article proposes that brain-derived neurotrophic factor (BDNF) is the main factor contributing to improved cognition following exercise. Additionally, it argues that cerebral blood flow (CBF) and oxidative stress explain the release of BDNF from cerebral endothelial cells. One way to test these hypotheses is to block endothelial function and measure the effect on BDNF levels and cognitive performance. The CBF and oxidative stress can also be examined in relationship to BDNF using a multiple linear regression...
September 2017: Medical Hypotheses
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