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Cerebral ischemia protection

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https://www.readbyqxmd.com/read/28212354/the-effect-of-dexmedetomidine-on-oxidative-stress-response-following-cerebral-ischemia-reperfusion-in-rats-and-the-expression-of-intracellular-adhesion-molecule-1-icam-1-and-s100b
#1
Yanwen Li, Shikun Liu
BACKGROUND Ischemia-reperfusion injury of whole brain involves a complicated pathophysiology mechanism. Dexmedetomidine (Dex) has been shown to have neuro protective functions. This study observed the effect of Dex on serum S100B and cerebral intracellular adhesion molecule-1 (ICAM-1) in a rat model of cerebral ischemia-reperfusion. MATERIAL AND METHODS Healthy Sprague Dawley (SD) rats (males, 7 weeks old) were randomly divided into sham, model, and Dex groups (n=20 each). A cerebral ischemia-reperfusion model was prepared by clipping of the bilateral common carotid artery combined with hypotension...
February 17, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28210222/icariside-ii-a-broad-spectrum-anti-cancer-agent-reverses-beta-amyloid-induced-cognitive-impairment-through-reducing-inflammation-and-apoptosis-in-rats
#2
Yuanyuan Deng, Long Long, Keke Wang, Jiayin Zhou, Lingrong Zeng, Lianzi He, Qihai Gong
Beta-amyloid (Aβ) deposition, associated neuronal apoptosis and neuroinflammation are considered as the important factors which lead to cognitive deficits in Alzheimer's disease (AD). Icariside II (ICS II), an active flavonoid compound derived from Epimedium brevicornum Maxim, has been extensively used to treat erectile dysfunction, osteoporosis and dementia in traditional Chinese medicine. Recently, ICS II attracts great interest due to its broad-spectrum anti-cancer property. ICS II shows an anti-inflammatory potential both in cancer treatment and cerebral ischemia-reperfusion...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28206988/inhibition-of-autophagy-blocks-cathepsins-tbid-mitochondrial-apoptotic-signaling-pathway-via-stabilization-of-lysosomal-membrane-in-ischemic-astrocytes
#3
Xian-Yong Zhou, Yu Luo, Yong-Ming Zhu, Zhi-He Liu, Thomas A Kent, Jia-Guo Rong, Wei Li, Shi-Gang Qiao, Min Li, Yong Ni, Kazumi Ishidoh, Hui-Ling Zhang
Our previous study and others have demonstrated that autophagy is activated in ischemic astrocytes and contributes to astrocytic cell death. However, the mechanisms of ischemia-induced autophagy remain largely unknown. In this study, we established a rat's model of permanent middle cerebral artery occlusion (pMCAO) and an in vitro oxygen and glucose deprivation (OGD) model. Autophagy was inhibited by either pharmacological treatment with 3-methyladenine (3-MA) and wortmannin (Wort) or genetic treatment with knockdown of Atg5 in primary cultured astrocytes and knockout of Atg5 in mouse embryonic fibroblast (MEF) cells, respectively...
February 16, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28203483/galanin-protects-from-caspase-8-12-initiated-neuronal-apoptosis-in-the-ischemic-mouse-brain-via-galr1
#4
Yun Li, Zhu Mei, Shuiqiao Liu, Tong Wang, Hui Li, Xiao-Xiao Li, Song Han, Yutao Yang, Junfa Li, Zhi-Qing David Xu
Galanin (GAL) plays key role in many pathophysiological processes, but its role in ischemic stroke remains unclear. Here, the models of 1 h middle cerebral artery occlusion (MCAO)/1-7 d reperfusion (R)-induced ischemic stroke and in vitro cell ischemia of 1 h oxygen-glucose deprivation (OGD)/24 h reoxygenation in primary cultured cortical neurons were used to explore GAL's effects and its underlying mechanisms. The results showed significant increases of GAL protein levels in the peri-infarct region (P) and infarct core (I) within 48 h R of MCAO mice (p<0...
February 2017: Aging and Disease
https://www.readbyqxmd.com/read/28203482/long-non-coding-rna-h19-induces-cerebral-ischemia-reperfusion-injury-via-activation-of-autophagy
#5
Jue Wang, Bin Cao, Dong Han, Miao Sun, Juan Feng
Long non-coding RNA H19 (lncRNA H19) was found to be upregulated by hypoxia, its expression and function have never been tested in cerebral ischemia and reperfusion (I/R) injury. This study intended to investigate the role of lncRNA H19 and H19 gene variation in cerebral I/R injury with focusing on its relationship with autophagy activation. Cerebral I/R was induced in rats by middle cerebral artery occlusion followed by reperfusion. SH-SY5Y cells were subjected to oxygen and glucose deprivation and reperfusion (OGD/R) to simulate I/R injury...
February 2017: Aging and Disease
https://www.readbyqxmd.com/read/28202285/decreased-mir-146a-expression-in-acute-ischemic-stroke-directly-targets-the-fbxl10-mrna-and-is-involved-in-modulating-apoptosis
#6
Sheng-Hua Li, Lan Chen, Xiao-Min Pang, Sheng-You Su, Xia Zhou, Chun-Yong Chen, Li-Gang Huang, Jing-Pin Li, Jing-Li Liu
BACKGROUND: miR-146a, a strong pro-apoptotic factor in some pathophysiological processes, is reported to be involved in ischemic stroke (IS), though its role remains unclear. Fbxl10 is an active anti-apoptotic factor and a predicted target of miR-146a. We hypothesized that dysregulation of miR-146a contributes to ischemic injury by targeting Fbxl10. METHODS: Circulating miRNAs were detected by miRNA microarray and qRT-PCR. miR-146a targets were predicted using bioinformatics and confirmed with a dual luciferase reporter assay...
February 12, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28199737/inhibition-of-trpv1-confers-neuroprotection-reduces-tnf-%C3%AE-and-increases-il-10-in-a-rat-stroke-model
#7
Elham Hakimizadeh, Ali Shamsizadeh, Ali Roohbakhsh, Mohammad Kazemi Arababadi, Mohammad Reza Hajizadeh, Mehdi Shariati, Mohammad Reza Rahmani, Mohammad Allahtavakoli
Stroke is a major cause of mortality and long-term disability in adults. TRPV1 plays a crucial role in neuroinflammation. In the current study, the effects of TRPV1 agonist (capsaicin) and antagonist (AMG9810) on cerebral ischemia were investigated. Forty male Wistar rats were assigned to the following experimental groups: sham, vehicle) ischemic), AMG9810 (selective TRPV1 antagonist, 0.5 mg/kg; 3 h after stroke), and capsaicin (1 mg/kg; 3 h after stroke). Stroke was induced by permanent middle cerebral artery occlusion and neurological deficits were evaluated 1, 3, and 7 days after stroke...
February 15, 2017: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/28196366/pre-treatment-of-17%C3%AE-estradiol-attenuates-cerebral-ischemia-induced-blood-brain-barrier-disruption-in-aged-rats-involvement-of-antioxidant-signaling
#8
Han Xiao, Mingyang Deng, Binbin Yang, Zhiping Hu, Jianguang Tang
BACKGROUND/AIMS: The blood-brain barrier (BBB) disruption is often induced in brain injury and particularly associated with cerebral ischemia in stroke. Estradiol, an endogenous steroid hormone, has been reported to play a protective role against cerebrovascular pathologies. Here we aimed to determine the potential effects of estradiol (17β-estradiol 3-benzoate, E2) on the integrity of BBB and brain damage following middle carotid artery occlusion (MCAO). METHODS: Aged ovariectomized female rats (24-month-old) were administered E2 for two months by daily intraperitoneal injections, prior to the induction of MCAO...
February 15, 2017: Neuroendocrinology
https://www.readbyqxmd.com/read/28195005/current-evidence-for-ampk-activation-involvement-on-resveratrol-induced-neuroprotection-in-cerebral-ischemia
#9
Narayana Pineda-Ramírez, Germán Fernando Gutiérrez Aguilar, Mónica Espinoza-Rojo, Penélope Aguilera
OBJECTIVES: Cerebral ischemia is a neurological condition in which energetics and oxidative stress are dysregulated. Resveratrol is a stilbene with potent pharmacological effects associated with its antioxidant properties. In the brain, resveratrol produces protective responses against ischemia, decreases infarct volume and improves neurological function. Adenosine monophosphate-activated protein kinase (AMPK) is a cellular sensor that acts as a switch to initiate adaptive changes in response to fluctuations in energy metabolism...
February 14, 2017: Nutritional Neuroscience
https://www.readbyqxmd.com/read/28191863/ulinastatin-downregulates-tlr4-and-nf-kb-expression-and-protects-mouse-brains-against-ischemia-reperfusion-injury
#10
Xiaofang Li, Likai Su, Xiangjian Zhang, Cong Zhang, Lina Wang, Yaoru Li, Ye Zhang, Tingting He, Xingyuan Zhu, Lili Cui
BACKGROUND: Inflammatory damage plays an important role in ischemic stroke and provides potential targets for therapy. Ulinastatin (UTI), a drug used to treat shock and acute pancreatitis in clinic, has attracted attention for its protective effects through immunomodulatory and anti-inflammatory properties. However, the effect of UTI in the acute phase of cerebral ischemia/reperfusion (I/R) is not clear. This study is to investigate the potential neuroprotective effect of UTI and explore its underlying mechanisms...
February 13, 2017: Neurological Research
https://www.readbyqxmd.com/read/28190474/salvianolic-acid-a-inhibits-calpain-activation-and-enos-uncoupling-during-focal-cerebral-ischemia-in-mice
#11
Qaisar Mahmood, Guang-Fa Wang, Gang Wu, Huan Wang, Chang-Xin Zhou, Hong-Yu Yang, Zhi-Rong Liu, Feng Han, Kui Zhao
BACKGROUND: Salvianolic acid A (SAA) is obtained from Chinese herb Salviae Miltiorrhizae Bunge (Labiatae), has been reported to have the protective effects against cardiovascular and neurovascular diseases. HYPOTHESIS: The aim of present study was to investigate the relationship between the effectiveness of SAA against neurovascular injury and its effects on calpain activation and endothelial nitric oxide synthase (eNOS) uncoupling. STUDY DESIGN: SAA or vehicle was given to C57BL/6 male mice for seven days before the occlusion of middle cerebral artery (MCAO) for 60min...
February 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28188764/modulation-of-cerebral-rage-expression-following-nitric-oxide-synthase-inhibition-in-rats-subjected-to-focal-cerebral-ischemia
#12
Rosaria Greco, Chiara Demartini, Anna Maria Zanaboni, Fabio Blandini, Diana Amantea, Cristina Tassorelli
The receptor for advanced glycation endproducts (RAGE) is a key mediator of neuroinflammation following cerebral ischemia. Nitric oxide (NO) plays a dualistic role in cerebral ischemia, depending on whether it originates from neuronal, inducible or endothelial synthase. Although a dynamic interplay between RAGE and NO pathways exists, its relevance in ischemic stroke has not been investigated. The aim of this study is to evaluate the effect of the NO synthase (NOS) inhibition on RAGE expression in rats subjected to transient middle cerebral artery occlusion (tMCAo)...
February 8, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28187734/the-potential-neuroprotective-role-of-a-histone-deacetylase-inhibitor-sodium-butyrate-after-neonatal-hypoxia-ischemia
#13
Joanna Jaworska, Malgorzata Ziemka-Nalecz, Joanna Sypecka, Teresa Zalewska
BACKGROUND: Histone deacetylase inhibitor (HDACi), sodium butyrate (SB), has been shown to be neuroprotective in adult brain injury models. Potential explanation for the inhibitor action involves among others reduced inflammation. We therefore anticipated that SB will provide a suitable option for brain injury in immature animals. The aim of our study was to test the hypothesis that one of the mechanisms of protection afforded by SB after neonatal hypoxia-ischemia is associated with anti-inflammatory action...
February 10, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28186440/britanin-ameliorates-cerebral-ischemia-reperfusion-injury-by-inducing-the-nrf2-protective-pathway
#14
Guozhen Wu, Lili Zhu, Xing Yuan, Hao Chen, Rui Xiong, Shoude Zhang, Hao Cheng, Yunheng Shen, Huazhang An, Tiejun Li, Honglin Li, Weidong Zhang
AIMS: Oxidative stress is considered the major cause of tissue injury after cerebral ischemia. The nuclear factor erythroid 2-related factor 2 (Nrf2) pathway is one of the most important defensive mechanisms against oxidative stresses and has been confirmed as a target for stroke treatment. Thus, we desired to find new Nrf2 activators and test their neuronal protective activity both in vivo and in vitro. RESULTS: The herb-derived compound Britanin is a potent inducer of the Nrf2 system...
February 10, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28183451/the-novel-exercise-induced-hormone-irisin-protects-against-neuronal-injury-via-activation-of-the-akt-and-erk1-2-signaling-pathways-and-contributes-to-the-neuroprotection-of-physical-exercise-in-cerebral-ischemia
#15
Dong-Jie Li, Yong-Hua Li, Hong-Bin Yuan, Le-Feng Qu, Pei Wang
BACKGROUND: Irisin is a novel exercise-induced myokine involved in the regulation of adipose browning and thermogenesis. In this study, we investigated the potential role of irisin in cerebral ischemia and determined whether irisin is involved in the neuroprotective effect of physical exercise in mice. MATERIALS AND METHODS: The middle cerebral artery occlusion (MCAO) model was used to produce cerebral ischemia in mice. First, the plasma irisin levels and changes in expression of the irisin precursor protein FNDC5 in skeletal muscle were determined post ischemic stroke...
March 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28178380/pre-ischemia-melatonin-treatment-alleviated-acute-neuronal-injury-after-ischemic-stroke-by-inhibiting-er-stress-dependent-autophagy-via-perk-and-ire1-signalings
#16
Dayun Feng, Bao Wang, Lei Wang, Neeta Abraham, Kai Tao, Lu Huang, Wei Shi, Yushu Dong, Yan Qu
Melatonin has demonstrated a potential protective effect in central nervous system. Thus, it is interesting to determine whether pre-ischemia melatonin administration could protect against cerebral ischemia/reperfusion (IR) related injury and the underlying molecular mechanisms. In this study, we revealed that IR injury significantly activated endoplasmic reticulum (ER) stress and autophagy in a middle cerebral artery occlusion (MCAO) mouse model. Pre-ischemia melatonin treatment was able to attenuate IR-induced ER stress and autophagy...
February 8, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/28176622/the-tlr9-antagonist-icpg-odn-at-different-dosages-inhibits-cerebral-ischemia-reperfusion-injury-in-mice
#17
Ying Zhou, Jingrui Pan, Qingxia Peng, Zhaofei Dong Dong, Lingna Deng Deng, Yidong Wang
Inflammatory responses are important mechanisms that are involved in cerebral ischemia/reperfusion(I/R) injury. Whether toll-like receptor 9(TLR9), which belongs to the innate immune system, takes part in the inflammatory responses following cerebral I/R remains unclear. This study examined the effect of different dosages of the TLR9 antagonist inhibitory oligodeoxynucleotide (iCpG-ODN) on cerebral I/R injury by using a mouse model of transient middle cerebral artery occlusion. Neurological function, infarct size, splenocytes and the expression of TLR9 and the downstream products of the TLR9 pathways were determined after cerebral I/R for up to 72 hours...
February 6, 2017: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/28169530/intranasal-pretreatment-with-z-ligustilide-the-main-volatile-component-of-rhizoma-chuanxiong-confers-prophylaxis-against-cerebral-ischemia-via-nrf2-and-hsp70-signaling-pathways
#18
Juan Li, Jie Yu, Hui Ma, Na Yang, Li Li, Ding-Ding Zheng, Ming-Xia Wu, Zhi-Long Zhao, Hong-Yi Qi
Z-Ligustilide (Z-LIG) is a major component in Rhizoma Chuanxiong, which has been traditionally used as a health food supplement for the prevention of cerebrovascular disease in China. This study investigates the ability of intranasal Z-LIG pretreatment to enhance protection against neuronal damage in rats with middle cerebral artery occlusion (MCAO) and the role of cellular stress response mechanisms Nrf2 and HSP70. Z-LIG significantly mitigated infarct volume, neurological dysfunction, blood-brain barrier disruption, and brain edema (p < 0...
February 16, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28161732/picroside-ii-protects-rat-lung-and-a549-cell-against-lps-induced-inflammation-by-the-nf-%C3%AE%C2%BAb-pathway
#19
Bingyu Shen, Chenxu Zhao, Chengzhen Chen, Zheng Li, Yang Li, Ye Tian, Haihua Feng
Picroside II is the main active ingredient in the root department of Chinese medicine Picrorhiza scrophulariiflora which has been proved to have beneficial effects on health, such as ameliorating the cerebral ischemia and protecting the liver. However, its effects on acute lung injury remain unclear. The purpose of the study was to evaluate the effects of picroside II on acute lung injury in mice and the inflammation in A549 cells which are lipopolysaccharide (LPS) induced. We evaluated the levels of tumor necrosis factor-α (TNF-α), interleukin-1 (IL-1β), and interleukin-6 (IL-6) in vivo and vitro by enzyme-linked immunosorbent assay (ELISA) and quantitative polymerase chain reaction (qRT-PCR)...
February 4, 2017: Inflammation
https://www.readbyqxmd.com/read/28161467/neuroprotective-diets-for-stroke
#20
María Irene Ayuso, Rafael Gonzalo-Gobernado, Joan Montaner
Stroke is one of the main causes of death and disability in the elderly. In the last few years, there has been increasing evidence that suggests the influence of the diet on the decrease of stroke risk. Probably, because of the presence of bioactive components with beneficial effects such as antioxidant or anti-inflammatory properties. This article reviews several dietary bioactive compounds from studies in models of cerebral ischemia that have obtained promising results decreasing cerebral damage. We propose that many of these compounds present in diet could be good candidates to test new neuroprotection approaches focused on reducing the damage and protecting the brain before stroke occurs...
February 2, 2017: Neurochemistry International
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