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https://www.readbyqxmd.com/read/29028769/activation-of-the-nuclear-receptor-fxr-improves-intestinal-cell-tolerance-to-ischemia-reperfusion-injury
#1
Xuan Wang, Shuo Li, Man Chen, Jing Liu, Ruirui Dong, Humin Wang, Shigong Zhu
The farnesoid X receptor (FXR) plays an important role in bile acid metabolism, intestinal homeostasis, and intestinal ischemia-reperfusion (I/R) injury. We aimed to clarify the potential effects of FXR on intestinal epithelial cell tolerance to intestinal I/R injury and reveal the underlying mechanisms. An intestinal I/R injury model was established by the occlusion of the superior mesenteric artery for ischemia for 1 h, followed by reperfusion for 4 h in C57BL/6 (wild-type; WT)and FXR mice. The small intestine injury was assessed by histological analysis...
October 12, 2017: Shock
https://www.readbyqxmd.com/read/29027434/-protective-effect-of-notoginsenoside-r1-on-neuron-injury-induced-by-ogd-r-through-atf6-akt-signaling-pathway
#2
Qian-Ling Hou, Yan Wang, Ying-Bo Li, Xue-Lian Hu, Sha-Li Wang
Notoginsenoside R1(NGR1),a critical compound in traditional herb Panax notoginseng, is a kind of estrogen receptor agonist.It is reported to exhibit anti-apoptotic,anti-oxidative and anti-inflammatory properties activity, so it is widely used for treatment of various diseases.In order to investigate the potential neuroprotective effect of NGR1 in hypoxic-ischemic brain damage(HIBD), primary cortical neurons were used in this study to establish oxygen-glucose deprivation/reoxygenation(OGD/R) injury models. They were treated with NGR1 and estrogen receptor inhibitor ICI-182780 respectively, then the neuronal survival, cell membrane integrity and apoptosis were assessed by MTT assay,lactate dehydrogenase test(LDH) and Hoechst 33342 stain respectively, while the protein expression levels of ATF6α,p-Akt,Akt,Bax and Cleaved Caspase-3 were measured by Western blotting...
March 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29026595/time-trend-occurrence-of-duodenal-intraepithelial-lymphocytosis-and-celiac-disease-in-an-open-access-endoscopic-population
#3
Gloria Galli, Flaminia Purchiaroni, Edith Lahner, Maria Carlotta Sacchi, Emanuela Pilozzi, Vito Domenico Corleto, Emilio Di Giulio, Bruno Annibale
BACKGROUND: Duodenal intraepithelial lymphocytosis (DIL) is a histological finding characterized by the increase of intraepithelial CD3T-lymphocytes over the normal value without villous atrophy, mostly associated to coeliac disease (CD), Helicobacter pylori (Hp) gastritis and autoimmune diseases. OBJECTIVE: To assess the occurrence of DIL, CD and Hp gastritis in an endoscopic population over a 13 year period. METHODS: From 2003 to 2015 we included adult patients who consecutively underwent oesophago-gastro-duodenoscopy (OGD) with duodenal biopsies assessing the overall and annual occurrence of DIL and CD and the prevalence of Hp gastritis...
October 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/29021742/neuroprotective-mechanisms-of-lycium-barbarum-polysaccharides-against-ischemic-insults-by-regulating-nr2b-and-nr2a-containing-nmda-receptor-signaling-pathways
#4
Zhongshan Shi, Lihui Zhu, Tingting Li, Xiaoya Tang, Yonghui Xiang, Xinjia Han, Luoxing Xia, Ling Zeng, Junhua Nie, Yongxia Huang, Chi Kwan Tsang, Ying Wang, Zhigang Lei, Zaocheng Xu, Kwok-Fai So, Yiwen Ruan
Glutamate excitotoxicity plays an important role in neuronal death after ischemia. However, all clinical trials using glutamate receptor inhibitors have failed. This may be related to the evidence that activation of different subunit of NMDA receptor will induce different effects. Many studies have shown that activation of the intrasynaptic NR2A subunit will stimulate survival signaling pathways, whereas upregulation of extrasynaptic NR2B will trigger apoptotic pathways. A Lycium barbarum polysaccharide (LBP) is a mixed compound extracted from Lycium barbarum fruit...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28993734/osmotin-protects-h9c2-cells-from-simulated-ischemia-reperfusion-injury-through-adipor1-pi3k-akt-signaling-pathway
#5
Jianhua Liu, Hua Sui, Jianlin Zhao, Yan Wang
Objective: This study aimed to investigate the effect of osmotin on myocardial ischemia/reperfusion (I/R), as well as the underlying mechanisms. Methods:In vitro I/R injury model was established on rat cardiac myoblast H9c2 cells by oxygen and glucose deprivation followed by reperfusion (OGD/R). Cells were administrated with osmotin, and transfected with small interfering RNAs (siRNAs) which specifically target adiponectin receptor 1 or 2 (AdipoR1/2). Besides, the cells were incubated with or without LY294002 as inhibitor of phosphatidylinositol 3-kinase (PI3K) under OGD/R condition...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28992629/%C3%AE-lipoic-acid-promotes-neurological-recovery-after-ischemic-stroke-by-activating-the-nrf2-ho-1-pathway-to-attenuate-oxidative-damage
#6
Chengmei Lv, Surendra Maharjan, Qingqing Wang, Yongxin Sun, Xu Han, Shan Wang, Zhengchun Mao, Yanming Xin, Bing Zhang
BACKGROUND/AIMS: Alpha-lipoic acid (α-LA) has been demonstrated to be protective against cerebral ischemia injury. Herein, we investigate the neuroprotective effect and underlying mechanisms of α-LA. METHODS: In vivo study, α-LA was administered intravenously upon reperfusion of transient middle cerebral artery occlusion. Garcia score was used to evaluate neurologic recovery. Infarct volume was examined by TTC staining, and oxidative damage was evaluated by ELISA assay...
October 9, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28990067/thevetiaflavone-from-wikstroemia%C3%A2-indica-ameliorates-pc12-cells-injury-induced-by-ogd-r-via-improving-ros%C3%A2-mediated-mitochondrial-dysfunction
#7
Huankai Yao, Zhenhai Yuan, Guangming Wei, Chun Chen, Jingyu Duan, Yan Li, Yunru Wang, Chunping Zhang, Yuanhua Liu
Cerebral ischemia and following reperfusion affects many people worldwide. To discover efficient therapeutic approaches, numerous natural products have been investigated. The current study investigated the protective effects of thevetiaflavone, a natural flavonoid obtained from Wikstroemia indica, and the associated mechanisms using PC12 cells induced by oxygen and glucose deprivation. As a result, thevetiaflavone improves cell viability and suppresses the leakage of lactate dehydrogenase from the cytoplasm...
October 4, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28987867/neuroprotective-effect-of-a-new-variant-of-epo-nonhematopoietic-against-oxidative-stress
#8
C Castillo, S Zaror, M Gonzalez, A Hidalgo, C F Burgos, O I Cabezas, F Hugues, S P Jiménez, E González-Horta, I González-Chavarría, J Gavilán, R Montesino, O Sánchez, Manuela G Lopez, J Fuentealba, J R Toledo
Human erythropoietin is mainly recognized for its hematopoietic function; however, by binding to its receptor (EpoR), it can activate different signaling pathways as STAT, PI3K, MAPK and RAS to increase cellular differentiation or provide neuroprotective effects, among others. A recombinant human erythropoietin variant with low glycosylation and without hematopoietic effect (EpoL) was purified from skimmed goat milk. Recombinant human erythropoietin (Epo) was obtained from CHO cell line and used as control to compare EpoL effects...
September 21, 2017: Redox Biology
https://www.readbyqxmd.com/read/28981095/rtn1-c-mediates-cerebral-ischemia-reperfusion-injury-via-er-stress-and-mitochondria-associated-apoptosis-pathways
#9
Lingli Gong, Yuewen Tang, Ran An, Muya Lin, Lijian Chen, Jian Du
The reticulon family has been found to induce apoptosis, inhibit axon regeneration and regulate protein trafficking. However, little is known about the mechanisms of how reticulon proteins are involved in neuronal death-promoting processes during ischemia. Here, we report that the expression of Reticulon Protein 1-C (RTN1-C) was associated with the progression of cerebral ischemia/reperfusion (I/R) injury. Using a combination of rat middle cerebral artery occlusion (MCAO) stroke and oxygen-glucose deprivation followed by reoxygenation (OGD/R) models, we determined that the expression of RTN1-C was significantly increased during cerebral ischemic/reperfusion...
October 5, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28979191/nrdp1-increases-ischemia-induced-primary-rat-cerebral-cortical-neurons-and-pheochromocytoma-cells-apoptosis-via-downregulation-of-hif-1%C3%AE-protein
#10
Yuan Zhang, Ke Yang, Ting Wang, Weiping Li, Xinchun Jin, Wenlan Liu
Neuregulin receptor degradation protein-1 (Nrdp1) is an E3 ubiquitin ligase that targets proteins for degradation and regulates cell growth, apoptosis and oxidative stress in various cell types. We have previously shown that Nrdp1 is implicated in ischemic cardiomyocyte death. In this study, we investigated the change of Nrdp1 expression in ischemic neurons and its role in ischemic neuronal injury. Primary rat cerebral cortical neurons and pheochromocytoma (PC12) cells were infected with adenoviral constructs expressing Nrdp1 gene or its siRNA before exposing to oxygen-glucose deprivation (OGD) treatment...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28975464/peroxynitrite-induced-tyrosine-nitration-contributes-to-matrix-metalloprotease-3-activation-relevance-to-hyperglycemic-ischemic-brain-injury-and-tissue-plasminogen-activator
#11
Sherif Hafez, Mohammed Abdelsaid, Susan C Fagan, Adviye Ergul
Matrix metalloprotease-3 (MMP3) activation mediates the tissue plasminogen activator (tPA)-induced hemorrhagic transformation after stroke. Hyperglycemia (HG) further exacerbates this outcome. We have recently shown that HG increases MMP3 activity in the brain after stroke. However, the combined HG-tPA effect on MMP3 activation, and the mechanisms through which MMP3 is activated were not previously reported. Accordingly, this study tested the hypothesis that tPA and HG increases MMP3 activity in the brain after stroke through peroxynitrite induced tyrosine nitration...
October 3, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28965081/sirt1-sirt3-axis-regulates-human-blood-brain-barrier-permeability-in-response-to-ischemia
#12
Tao Chen, Shu-Hui Dai, Xia Li, Peng Luo, Jie Zhu, Yu-Hai Wang, Zhou Fei, Xiao-Fan Jiang
Sirtuin1 (Sirt1) and Sirtuin3 (Sirt3) are two well-characterized members of the silent information regulator 2 (Sir2) family of proteins. Both Sirt1 and Sirt3 have been shown to play vital roles in resistance to cellular stress, but the interaction between these two sirtuins has not been fully determined. In this study, we investigated the role of Sirt1-Sirt3 axis in blood-brain barrier (BBB) permeability after ischemia in vitro. Human brain microvascular endothelial cells and astrocytes were co-cultured to model the BBB in vitro and oxygen and glucose deprivation (OGD) was performed to mimic ischemia...
September 22, 2017: Redox Biology
https://www.readbyqxmd.com/read/28963051/-phenserine-inhibits-neuronal-apoptosis-following-ischemia-reperfusion-injury
#13
Cheng-Fu Chang, Jing-Huei Lai, John Chung-Che Wu, Nigel H Greig, Robert E Becker, Yu Luo, Yen-Hua Chen, Shuo-Jhen Kang, Yung-Hsiao Chiang, Kai-Yun Chen
Stroke commonly leads to adult disability and death worldwide. Its major symptoms are spastic hemiplegia and discordant motion, consequent to neuronal cell death induced by brain vessel occlusion. Acetylcholinesterase (AChE) is upregulated and allied with inflammation and apoptosis after stroke. Recent studies suggest that AChE inhibition ameliorates ischemia-reperfusion injury and has neuroprotective properties. (-)-Phenserine, a reversible AChE inhibitor, has a broad range of actions independent of its AChE properties, including neuroprotective ones...
September 26, 2017: Brain Research
https://www.readbyqxmd.com/read/28962873/arctic-ground-squirrel-resist-peroxynitrite-mediated-cell-death-in-response-to-oxygen-glucose-deprivation
#14
Saurav Bhowmick, Kelly L Drew
Cerebral ischemia-reperfusion (I/R) injury initiates a cascade of events, generating nitric oxide (NO) and superoxide(O2(•-)) to form peroxynitrite (ONOO(-)), a potent oxidant. Arctic ground squirrels (AGS; Urocitellus parryii) show high tolerance to I/R injury. However, the underlying mechanism remains elusive. We hypothesize that tolerance to I/R modeled in an acute hippocampal slice preparation in AGS is modulated by reduced oxidative and nitrative stress. Hippocampal slices (400µm) from rat and AGS were subjected to oxygen glucose deprivation (OGD) using a novel microperfusion technique...
September 28, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28961497/irisin-protects-against-neuronal-injury-induced-by-oxygen-glucose-deprivation-in-part-depends-on-the-inhibition-of-ros-nlrp3-inflammatory-signaling-pathway
#15
Juan Peng, Xian Deng, Wei Huang, Ji-Hua Yu, Jian-Xiong Wang, Jie-Ping Wang, Shi-Bin Yang, Xi Liu, Li Wang, Yun Zhang, Xiang-Yu Zhou, Hui Yang, Yan-Zheng He, Fang-Yuan Xu
Recent studies found that irisin, a newly discovered skeletal muscle-derived myokine during exercise, is also synthesized in various tissues of different species and protects against neuronal injury in cerebral ischemia. The NOD-like receptor pyrin 3 (NLRP3) inflammasome play an important role in detecting cellular damage and mediating inflammatory responses to aseptic tissue injury during ischemic stroke. However, it is unclear whether irisin is involved in the regulation of NLRP3 inflammasome activation during ischemic stroke...
September 26, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28957797/resveratrol-enhances-neurite-outgrowth-and-synaptogenesis-via-sonic-hedgehog-signaling-following-oxygen-glucose-deprivation-reoxygenation-injury
#16
Fanren Tang, Shuang Guo, Hongyan Liao, Pingping Yu, Li Wang, Xiaosong Song, Jixiang Chen, Qin Yang
BACKGROUND/AIMS: Neurite outgrowth and synaptogenesis are critical steps for functional recovery after stroke. Resveratrol promotes neurite outgrowth and synaptogenesis, but the underlying mechanism is not well understood, although the Sonic hedgehog (Shh) signaling pathway may be involved. Given that resveratrol activates sirtuin (Sirt)1, the present study examined whether this is mediated by Shh signaling. METHODS: Primary cortical neuron cultures were pretreated with drugs before oxygen-glucose deprivation/reoxygenation (OGD/R)...
September 28, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28952074/mfn2-mediated-preservation-of-mitochondrial-function-contributes-to-the-protective-effects-of-bhapi-in-response-to-ischemia
#17
Xiao-Li Chen, Guo-Ping Zhang, Sheng-Long Guo, Jia-Qi Ding, Jia-Ji Lin, Qian Yang, Zhu-Yi Li
Disturbances in intracellular iron homeostasis are associated with neuronal injury after stroke. However, exposure of cells to classical chelators may interfere with physiological iron functions. BHAPI is an iron prochelator that exerts strong iron binding capacity only under oxidative stress conditions. This study investigated the protective effects of N'-(1-(2-((4-(4,4,5,5-tetramethyl-1,2,3-dioxoborolan-2-yl)benzyl)oxy)phenyl)ethylidene (BHAPI) on an in vitro ischemia model mimicked by oxygen and glucose deprivation (OGD) in neuronal HT22 cells...
September 26, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/28951984/remote-ischemic-preconditioning-protects-human-neural-stem-cells-from-oxidative-stress
#18
Ayako Motomura, Mikiko Shimizu, Akira Kato, Kazuya Motomura, Akane Yamamichi, Hiroko Koyama, Fumiharu Ohka, Tomohide Nishikawa, Yusuke Nishimura, Masahito Hara, Tetsuya Fukuda, Yasuhiko Bando, Toshihide Nishimura, Toshihiko Wakabayashi, Atsushi Natsume
In previous clinical trials, we showed that remote ischemic preconditioning (rIPC) reduced myocardial damage in children undergoing treatment for congenital heart defects and postoperative renal failure in patients undergoing abdominal aortic aneurysm surgery. In rabbit experiments, pre-treatment with plasma and plasma dialysate (obtained using 15-kDa cut-off dialysis membrane) from donor rabbits subjected to rIPC similarly protected against cardiac infarction. However, the protective substances containing in rIPC plasma have been unknown...
September 26, 2017: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/28951554/endocytosis-and-lysosomal-degradation-of-glua2-3-ampars-in-response-to-oxygen-glucose-deprivation-in-hippocampal-but-not-cortical-neurons
#19
Zsombor Koszegi, Maria Fiuza, Jonathan G Hanley
Global cerebral ischemia results in oxygen and glucose deprivation (OGD) and consequent delayed cell death of vulnerable neurons, with hippocampal CA1 neurons more vulnerable than cortical neurons. Most AMPA receptors (AMPARs) are heteromeric complexes of subunits GluA1/GluA2 or GluA2/GluA3, and the presence of GluA2 renders AMPARs Ca(2+)-impermeable. In hippocampal CA1 neurons, OGD causes the synaptic expression of GluA2-lacking Ca(2+)-permeable AMPARs, contributing to toxic Ca(2+) influx. The loss of synaptic GluA2 is caused by rapid trafficking of GluA2-containing AMPARs from the cell surface, followed by a delayed reduction in GluA2 mRNA expression...
September 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28951325/sirtuin-6-protects-the-brain-from-cerebral-ischemia-reperfusion-injury-through-nrf2-activation
#20
Wei Zhang, Rui Wei, Lin Zhang, Yang Tan, Chuanyun Qian
Sirtuin 6 (SIRT6), a member of the sirtuin family of NAD(+)-dependent deacetylases, has been shown to produce beneficial effects in myocardial ischemia/reperfusion (I/R). However, the role of SIRT6 in cerebral I/R is largely unclear. In this study, we investigated the effects of SIRT6 overexpression in regulating I/R injury in a mouse cerebral I/R model in vivo and in oxygen-glucose-deprivation/reoxygenation (OGD/R)-stimulated neuro-2a neuroblastoma cells in vitro. We found that cerebral I/R (1 h/24 h) resulted in decreased SIRT6 expression in the cerebral cortex (P < 0...
September 23, 2017: Neuroscience
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