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Stroke reperfusion injury

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https://www.readbyqxmd.com/read/29134984/evaluation-of-neuroprotective-effect-of-hibiscus-sabdariffa-linn-aqueous-extract-against-ischaemic-reperfusion-insult-by-bilateral-common-carotid-artery-occlusion-in-adult-male-rats
#1
Olatunde Owoeye, Micheal Oluwatosin Gabriel
Ischaemic brain injury continues to be devastating, causing social, medical and relationship disruption. Oxidativedamage has been reported to be one of the mechanisms for brain damage following ischaemic stroke. The antioxidant activityof Hibiscus sabdariffa L. was investigated for a possible protective effect against ischaemia-induced brain damage in rats.Adult male Wistar rats (n=35) were divided into five groups of 7 rats per group. Group 1 served as control was given tapwater; Group 2: 500 mg/kg daily of Hibiscus sabdariffa L...
June 30, 2017: Nigerian Journal of Physiological Sciences: Official Publication of the Physiological Society of Nigeria
https://www.readbyqxmd.com/read/29126723/design-synthesis-and-evaluation-of-ndga-analogues-as-potential-anti-ischemic-stroke-agents
#2
Lili Huang, Jiabing Wang, Liping Chen, Min Zhu, Shoubiao Wu, Shenghui Chu, Yuantie Zheng, Ziliang Fan, Jiafeng Zhang, Wulan Li, Dahui Chen, Xiufei Yang, Sicen Wang, Peihong Qiu, Jianzhang Wu
Exogenous supplementation of antioxidants with ROS scavenging activity would be a potential therapy to cerebral ischemia-reperfusion injury in stroke. In the present study, a series of NDGA analogues with attenuation oxidative stress by directly scavenging ROS and indirectly through keap1/Nrf2/ARE pathway activation were designed and synthesized. All analogues were found to effectively remove ROS directly by DPPH radical scavenging assay, and compound 3a conferred potent protection from the oxidative injury in PC12 cells via promoting Nrf2 to translocate into nucleus and increasing expression of heme oxygenase-1(HO-1), where strongly reduced intracellular ROS level indirectly...
October 16, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29125039/astrocyte-autophagy-flux-protects-neurons-against-oxygen-glucose-deprivation-and-ischemic-reperfusion-injury
#3
Xue Liu, Fengfeng Tian, Shiquan Wang, Feng Wang, Lize Xiong
The role of autophagy varies with the type of acute brain injury. In general, autophagy mediates a clear neuroprotective effect in intoxication caused by various psychoactive agents, subarachnoid hemorrhage and spinal cord injury. In contrast, autophagic cell death has also been reported to actively contribute to neuronal loss in neonatal hypoxic ischemic encephalopathy. However, it still remains to be determined whether autophagy pays a cytoprotective or a cytotoxic role in stroke. Previous studies focused primarily on the role of neurons rather than the role of astrocytes in brain injury...
November 10, 2017: Rejuvenation Research
https://www.readbyqxmd.com/read/29123977/sodium-hydrosulfide-attenuates-cerebral-ischemia-reperfusion-injury-by-suppressing-overactivated-autophagy-in-rats
#4
Wen-Wu Jiang, Bai-Sheng Huang, Yang Han, Lv-Hong Deng, Li-Xiang Wu
Ischemic stroke is a leading cause of death and disability worldwide, and autophagy may be involved in the pathological process of cerebral ischemia/reperfusion injury. Hydrogen sulfide (H2S) is an endogenous gasotransmitter with protective effects against multiple diseases. Here, we tested the effect of H2S on cerebral ischemia/reperfusion injury in rats. Sodium hydrosulfide (NaHS), an H2S donor, improved neurological function and reduced the size of the infarcts induced by transient middle cerebral artery occlusion (MCAO) followed by reperfusion in rats...
November 2017: FEBS Open Bio
https://www.readbyqxmd.com/read/29123466/neuroprotective-effect-of-%C3%AE-caryophyllene-on-cerebral-ischemia-reperfusion-injury-via-regulation-of-necroptotic-neuronal-death-and-inflammation-in-vivo-and-in-vitro
#5
Mei Yang, Yongjiu Lv, Xiaocui Tian, Jie Lou, Ruidi An, Qian Zhang, Minghang Li, Lu Xu, Zhi Dong
Necrotic cell death is a hallmark feature of ischemic stroke and it may facilitate inflammation by releasing intracellular components after cell-membrane rupture. Previous studies reported that β-caryophyllene (BCP) mitigates cerebral ischemia-reperfusion (I/R) injury, but the underlying mechanism remains unclear. We explored whether BCP exerts a neuroprotective effect in cerebral I/R injury through inhibiting necroptotic cell death and inflammation. Primary neurons with and without BCP (0.2, 1, 5, 25 μM) treatment were exposed to oxygen-glucose deprivation and re-oxygenation (OGD/R)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29122651/downregulation-of-lipocalin-2-and-bim-expression-after-remote-limb-preconditioning-in-the-ischemic-rat-brain
#6
Mingli Liu, Jing Chen, Shufan Zhang, Chuancheng Ren
Although it has been proved that remote limb preconditioning (RPC) can exert neurological protection effects after ischemic cerebral stroke (ICS), the underlying mechanisms of RPC still need to be elucidated for its better transformation to clinical application. Lipocalin-2 (LCN2) was upregulated after cerebral ischemia and mediated reperfusion injury in the models of ischemic stroke. So here, we investigated that whether RPC could downregulate the levels of LCN2 protein and its receptor resulting from cerebral ischemia reperfusion (I/R) injury...
November 6, 2017: Brain Research
https://www.readbyqxmd.com/read/29117648/serum-neuron-specific-enolase-as-a-marker-of-brain-ischemia-reperfusion-injury-in-patients-undergoing-carotid-endarterectomy
#7
Marek Iłżecki, Joanna Iłżecka, Stanisław Przywara, Piotr Terlecki, Aneta Grabarska, Andrzej Stepulak, Tomasz Zubilewicz
In patients with atherosclerotic stenosis of the extracranial segment of internal carotid artery, surgical intervention is an effective method to prevent cerebral ischemic stroke. However, this surgical procedure may cause vascular brain damage. The aim of the study was to investigate consequential brain ischemia-reperfusion injury by measuring the cerebral specific marker, neuron-specific (NSE), in serum of patients having undergone internal carotid endarterectomy (CEA). The study involved 25 patients that underwent CEA due to internal carotid artery stenosis...
December 2016: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29116527/worse-outcome-in-stroke-patients-treated-with-rt-pa-without-early-reperfusion-associated-factors
#8
Ramón Iglesias-Rey, Manuel Rodríguez-Yáñez, Emilio Rodríguez-Castro, José Manuel Pumar, Susana Arias, María Santamaría, Iria López-Dequidt, Pablo Hervella, Clara Correa-Paz, Tomás Sobrino, Denis Vivien, Francisco Campos, Mar Castellanos, José Castillo
Based on preclinical studies suggesting that recombinant tissue plasminogen activator (rt-PA) may promote ischemic brain injuries, we investigated in patients the possible risk of worse clinical outcome after rt-PA treatment as a result of its inability to resolve cerebral ischemia. Here, we designed a cohort study using a retrospective analysis of patients who received treatment with intravenous (4.5-h window) or intraarterial rt-PA, without or with thrombectomy. Controls were consecutive patients who did not receive recanalization treatment, who met all inclusion criteria...
November 7, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/29115993/adjudin-preconditioned-neural-stem-cells-enhance-neuroprotection-after-ischemia-reperfusion-in-mice
#9
Tingting Zhang, Xiao Yang, Tengyuan Liu, Jiaxiang Shao, Ningzhen Fu, Aijuan Yan, Keyi Geng, Weiliang Xia
BACKGROUND: Transplantation of neural stem cells (NSCs) has been proposed as a promising therapeutic strategy for the treatment of ischemia/reperfusion (I/R)-induced brain injury. However, existing evidence has also challenged this therapy on its limitations, such as the difficulty for stem cells to survive after transplantation due to the unfavorable microenvironment in the ischemic brain. Herein, we have investigated whether preconditioning of NSCs with adjudin, a small molecule compound, could enhance their survivability and further improve the therapeutic effect for NSC-based stroke therapy...
November 7, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/29114077/the-ubiquitin-e3-ligase-traf6-exacerbates-ischemic-stroke-by-ubiquitinating-and-activating-rac1
#10
Tao Li, Juan-Juan Qin, Xia Yang, Yan-Xiao Ji, Fangliang Guo, Wen-Lin Cheng, Xiaolin Wu, Fu-Han Gong, Ying Hong, Xue-Yong Zhu, Jun Gong, Zhihua Wang, Zan Huang, Zhi-Gang She, Hongliang Li
Stroke is one of the leading causes of morbidity and mortality worldwide. Inflammation, oxidative stress, apoptosis, and excitotoxicity contribute to neuronal death during ischemic stroke; however, the mechanisms underlying these complicated pathophysiological processes remain to be fully elucidated. Here, we found that the expression of tumor necrosis factor receptor-associated factor 6 (TRAF6) was markedly increased after cerebral ischemia/reperfusion (I/R) in mice. TRAF6 ablation in male mice decreased the infarct volume and neurological deficit scores, and decreased pro-inflammatory signaling, oxidative stress and neuronal death after cerebral I/R, whereas transgenic overexpression of TRAF6 in male mice exhibited opposite effects...
November 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29108817/chronic-oral-methylene-blue-treatment-in-a-rat-model-of-focal-cerebral-ischemia-reperfusion
#11
Lei Huang, Jianfei Lu, Bianca Cerqueira, Yichu Liu, Zhao Jiang, Timothy Q Duong
A single acute low-dose methylene blue (MB), an FDA-grandfathered drug, has been shown to ameliorate behavioral deficits and reduces MRI-defined infarct volume in experimental ischemic stroke when administered intravenously or intraperitoneally. The efficacy of chronic MB treatment in ischemic stroke remains unknown. In a randomized, double-blinded and vehicle-controlled design, we investigated the efficacy of chronic oral MB administration in ischemic stroke longitudinally up to 60 days post injury using MRI and behavioral tests, with end-point histology...
November 3, 2017: Brain Research
https://www.readbyqxmd.com/read/29103102/combination-of-emricasan-with-ponatinib-synergistically-reduces-ischemia-reperfusion-injury-in-rat-brain-through-simultaneous-prevention-of-apoptosis-and-necroptosis
#12
Jing Tian, Shu Guo, Heng Chen, Jing-Jie Peng, Miao-Miao Jia, Nian-Sheng Li, Xiao-Jie Zhang, Jie Yang, Xiu-Ju Luo, Jun Peng
Apoptosis and receptor-interacting protein kinase 1/3(RIPK1/3)-mediated necroptosis contribute to the cerebral ischemia/reperfusion (I/R) injury. Emricasan is an inhibitor of caspases in clinical trials for liver diseases while ponatinib could be a potential inhibitor for RIPK1/3. This study aims to investigate the effect of emricasan and/or ponatinib on cerebral I/R injury and the underlying mechanisms. Firstly, we evaluated the status of apoptosis and necroposis in a rat model of cerebral I/R under different conditions, which showed noticeable apoptosis and necroptosis under condition of 2-h ischemia and 24-h reperfusion; next, the preventive or therapeutic effect of emricasan or ponatinib on cerebral I/R injury was tested...
November 4, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/29102280/reperfusion-therapy-what-s-with-the-obstructed-leaky-and-broken-capillaries
#13
REVIEW
D Neil Granger, Peter R Kvietys
Microvascular dysfunction is well established as an early and rate-determining factor in the injury response of tissues to ischemia and reperfusion (I/R). Severe endothelial cell dysfunction, which can develop without obvious morphological cell injury, is a major underlying cause of the microvascular abnormalities that accompany I/R. While I/R-induced microvascular dysfunction is manifested in different ways, two responses that have received much attention in both the experimental and clinical setting are impaired capillary perfusion (no-reflow) and endothelial barrier failure with a transition to hemorrhage...
September 21, 2017: Pathophysiology: the Official Journal of the International Society for Pathophysiology
https://www.readbyqxmd.com/read/29101036/profiling-neuron-autonomous-lncrna-changes-upon-ischemia-reperfusion-injury
#14
Li Haiying, Wu Youjia, Suo Guihai, Shen Feifei, Zhen Yuqin, Xia Chen, Lv Haitao
Extensive changes of neuronal transcriptome occur post ischemic stroke and during the following reperfusion. Although numerous studies focused on transcriptome changes of mRNAs associated with ischemic stroke, little is known about whether and how long non-coding RNAs (lncRNAs), which play critical roles in cellular homeostasis, are involved in this process. In this study, we performed high throughput screening to analyze expression changes of lncRNAs in primarily cultured hippocampal neurons under an oxygen-glucose deprivation/reperfusion (OGD/R) condition at 0h, 6 h, 12 h, and 18 h, respectively...
October 31, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29097777/low-dose-nitrite-improves-reoxygenation-following-renal-ischemia-in-rats
#15
Kathleen Cantow, Bert Flemming, Mechthild Ladwig-Wiegard, Pontus B Persson, Erdmann Seeliger
In hypoxic and acidic tissue environments, nitrite is metabolised to nitric oxide, thus, bringing about novel therapeutic options in myocardial infarction, peripheral artery disease, stroke, and hypertension. Following renal ischemia, reperfusion of the kidney remains incomplete and tissue oxygenation is reduced for several minutes to hours. Thus, in renal ischemia-reperfusion injury, providing nitrite may have outstanding therapeutic value. Here we demonstrate nitrite's distinct potential to rapidly restore tissue oxygenation in the renal cortex and medulla after 45 minutes of complete unilateral kidney ischemia in the rat...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29089640/acute-and-long-term-cardioprotective-effects-of-the-traditional-chinese-medicine-mlc901-against-myocardial-ischemia-reperfusion-injury-in-mice
#16
Anne Vincent, Aurélie Covinhes, Christian Barrère, Laura Gallot, Soulit Thoumala, Christophe Piot, Catherine Heurteaux, Michel Lazdunski, Joël Nargeot, Stéphanie Barrère-Lemaire
MLC901, a traditional Chinese medicine containing a cocktail of active molecules, both reduces cerebral infarction and improves recovery in patients with ischemic stroke. The aim of this study was to evaluate the acute and long-term benefits of MLC901 in ischemic and reperfused mouse hearts. Ex vivo, under physiological conditions, MLC901 did not show any modification in heart rate and contraction amplitude. However, upon an ischemic insult, MLC901 administration during reperfusion, improved coronary flow in perfused hearts...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29080695/improvement-in-cerebral-ischemia-reperfusion-injury-through-the-tlr4-nf-%C3%AE%C2%BAb-pathway-after-kudiezi-injection-in-rats
#17
Xuemei Liu, Xinyang Zhang, Fengli Wang, Xiao Liang, Zixiu Zeng, Jiayi Zhao, Hong Zheng, Xiangning Jiang, Yunling Zhang
AIM: Kudiezi injection (KDZ) can improve the clinical outcomes of patients with stroke, but the mechanisms remain unclear. This study aimed to investigate whether KDZ could modulate the nuclear factor kappa B (NF-κB) pathways in rat models of transient middle cerebral artery occlusion (tMCAO). MATERIALS AND METHODS: Male Sprague-Dawley rats were subjected to tMCAO and randomized to Sham (sham-operated), tMCAO (tMCAO+0.9% saline), and KDZ (tMCAO+7.2mL/kg KDZ) groups...
October 28, 2017: Life Sciences
https://www.readbyqxmd.com/read/29071893/-influence-of-electroacupuncture-intervention-on-glutamic-acid-and-ca-2-contents-and-expression-of-nmda-receptor-protein-in-hippocampus-in-vascular-dementia-rats
#18
Qian Zhang, Chuang Zhang, Jia-Yin Zhang, Hui-Zhen Zhang, Xiao-Feng Li, Hong-Ling Xiao, Yan-Hui Sun, Hai-Jiao Xing, Xiao-Kang Xu, Yu-Lei Liang, Xin Zhang, Xiao-Qi Zhang, Ai-Ying Li
OBJECTIVE: To observe the influence of electroacupuncture (EA) intervention on hippocampal glutamate (Glu) and Ca(2+) contents, and expression of Glu-N-methyl-D-aspartic acid receptor(NMDAR) and the learning-memory ability in vascular dementia (VD) rats, so as to reveal its mechanisms underlying improvement of VD. METHODS: SD rats were rando-mized into sham operation (sham) group (n=9), model group (n=11) and EA groups (n=10). The VD model was established by repeated bilateral common carotid arteries occlusion and reperfusion plus intraperitoneal injection of sodium nitroprusside...
December 25, 2016: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29061394/jak2-stat3-pathway-is-involved-in-the-protective-effects-of-epidermal-growth-factor-receptor-activation-against-cerebral-ischemia-reperfusion-injury-in-rats
#19
Yuanyuan Tang, Xuhui Tong, Yan Li, Guojun Jiang, Meiling Yu, Yinling Chen, Shuying Dong
Cerebral ischemia and reperfusion is a common pathophysiologic process, which is involved in stroke and brain trauma. Recent studies revealed that activating epidermal growth factor receptor (EGFR) ameliorates cerebral ischemia/reperfusion (I/R) injury, however, the precise mechanisms remain to be illuminated. In this study, the neurological behavior was evaluated by Longa score. The infarct volume was performed by 2, 3, 5-triphenyltetrazolium chloride (TTC) staining and the expression of p-EGFR, p-STAT3, connexin (Cx43), Bax and Bcl-2 were detected by Western blot...
October 20, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29059593/splenectomy-protects-aged-mice-from-injury-after-experimental-stroke
#20
Anjali Chauhan, Abdullah Al Mamun, Gabriel Spiegel, Nia Harris, Liang Zhu, Louise D McCullough
Elderly stroke patients and aged animals subjected to experimental stroke have significantly worse functional recovery and higher mortality compared to younger subjects. Activation of the peripheral immune system is known to influence stroke outcome. Prior studies have shown that splenectomy reduces ischemic brain injury in young mice. As immune function changes with aging, it is unclear whether splenectomy will confer similar benefits in aged animals. We investigated the contribution of spleen to brain injury after cerebral ischemia in aged male mice...
September 28, 2017: Neurobiology of Aging
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