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Cerebral ischemia protection

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https://www.readbyqxmd.com/read/28640888/mechanisms-of-acute-neurovascular-protection-with-at1-blockade-after-stroke-effect-of-prestroke-hypertension
#1
Ahmed Alhusban, Anna Kozak, Bindu Pillai, Heba Ahmed, Mohammed A Sayed, Maribeth H Johnson, Tauheed Ishrat, Adviye Ergul, Susan C Fagan
Stroke is a leading cause of adult disability worldwide. Improving stroke outcome requires an orchestrated interplay that involves up regulation of pro-survival pathways and a concomitant suppression of pro-apoptotic mediators. In this investigation, we assessed the involvement of eNOS in the AT1 blocker-mediated protective and pro-recovery effects in animals with hypertension. We also evaluated the effect of acute eNOS inhibition in hypertensive animals. To achieve these goals, spontaneously hypertensive rats (SHR) were implanted with blood pressure transmitters, and randomized to receive either an eNOS inhibitor (L-NIO) or saline one hour before cerebral ischemia induction...
2017: PloS One
https://www.readbyqxmd.com/read/28628214/unconventional-role-of-voltage-gated-proton-channels-vsop-hv1-in-regulation-of-microglial-ros-production
#2
Takafumi Kawai, Yoshifumi Okochi, Tomohiko Ozaki, Yoshio Imura, Schuichi Koizumi, Maya Yamazaki, Manabu Abe, Kenji Sakimura, Toshihide Yamashita, Yasushi Okamura
It has been established that voltage-gated proton channels (VSOP/Hv1), encoded by Hvcn1, support reactive oxygen species (ROS) production in phagocytic activities of neutrophils (El Chemaly et al. 2010) and antibody production in B lymphocytes (Capasso et al. 2010). VSOP/Hv1 is a potential therapeutic target for brain ischemia, since Hvcn1 deficiency reduces microglial ROS production and protects brain from neuronal damage (Wu et al. 2012). In the present study, we report that VSOP/Hv1 has paradoxical suppressive role in ROS production in microglia...
June 19, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28627606/effects-of-ischemic-preconditioning-on-pdgf-bb-expression-in-the-gerbil-hippocampal-ca1-region-following-transient-cerebral-ischemia
#3
Jae-Chul Lee, Yang Hee Kim, Tae-Kyeong Lee, In Hye Kim, Jeong Hwi Cho, Geum-Sil Cho, Bich-Na Shin, Joon Ha Park, Ji Hyeon Ahn, Myoung Cheol Shin, Jun Hwi Cho, Il Jun Kang, Moo-Ho Won, Jeong Yeol Seo
Ischemic preconditioning (IPC) is induced by exposure to brief durations of transient ischemia, which results in ischemic tolerance to a subsequent longer or lethal period of ischemia. In the present study, the effects of IPC (2 min of transient cerebral ischemia) were examined on immunoreactivity of platelet‑derived growth factor (PDGF)‑BB and on neuroprotection in the gerbil hippocampal CA1 region following lethal transient cerebral ischemia (LTCI; 5 min of transient cerebral ischemia). IPC was subjected to a 2‑min sublethal ischemia and a LTCI was given 5‑min transient ischemia...
June 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28627088/astrogliosis-and-impaired-aquaporin-4-and-dystrophin-systems-in-idiopathic-normal-pressure-hydrocephalus
#4
Per Kristian Eide, Hans-Arne Hansson
AIMS: Idiopathic normal pressure hydrocephalus (iNPH) is one subtype of dementia that may improve following drainage of cerebrospinal fluid (CSF). This prospective observational study explored whether expression of the water channel aquaporin-4 (AQP4) and the anchoring molecule dystrophin 71 (Dp71) are altered at astrocytic perivascular endfeet and in adjacent neuropil of iNPH patient. Observations were related to measurements of pulsatile and static intracranial pressure (ICP). METHODS: The study included iNPH patients undergoing overnight monitoring of the pulsatile/static ICP, in whom a biopsy was taken from the frontal cerebral cortex during placement of the ICP sensor...
June 19, 2017: Neuropathology and Applied Neurobiology
https://www.readbyqxmd.com/read/28625252/-cerebral-injury-induced-by-heat-stroke-and-the-therapeutic-effect-of-hyperbaric-oxygen-therapy
#5
Xiaoxiao Ni, Zhifeng Liu, Qiuyou Xie, Huasheng Tong, Lei Su, Ronghao Yu
With the global warming, the incidence of heat stroke was significantly higher than before. Severe heat stroke has a high mortality, high morbidity and consolidated central nervous system injury characteristics. The main features of severe heat stroke cerebral injury include cognitive impairment, delirium, convulsions and coma. Its mechanism is related with heat shock induced cerebral tissue ischemia and hypoxia, vascular dysfunction, secondary cascade inflammation and so on. Currently, the main treatment of heat stroke cerebral injury is the hypothermia therapy, dehydration for the reduction of intracranial pressure, naloxone and other cerebral protection and nutrition treatments...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28624878/a-combination-of-three-repurposed-drugs-administered-at-reperfusion-as-a-promising-therapy-for-postischemic-brain-injury
#6
I-Chen Yu, Ping-Chang Kuo, Jui-Hung Yen, Hallel C Paraiso, Eric T Curfman, Benecia C Hong-Goka, Robert D Sweazey, Fen-Lei Chang
Cerebral ischemia leads to multifaceted injury to the brain. A polytherapeutic drug that can be administered immediately after reperfusion may increase protection to the brain by simultaneously targeting multiple deleterious cascades. This study evaluated efficacy of the combination of three clinically approved drugs: lamotrigine, minocycline, and lovastatin, using two mouse models: global and focal cerebral ischemia induced by transient occlusion of the common carotid arteries or the middle cerebral artery, respectively...
June 17, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/28616347/intraoperative-care-for-aortic-surgery-using-circulatory-arrest
#7
REVIEW
Félix Ezequiel Fernández Suárez, David Fernández Del Valle, Adrián González Alvarez, Blanca Pérez-Lozano
The total circulatory arrest (CA) is necessary to achieve optimal surgical conditions in certain aortic pathologies, especially in those affecting the ascending aorta and aortic arch. During this procedure it is necessary to protect all the organs of ischemia, especially those of the central nervous system and for this purpose several strategies have been developed. The first and most important protective method is systemic hypothermia. The degree of hypothermia and the route of application have been evolving and currently tend to use moderate hypothermia (MH) (20...
May 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28616035/neuroprotective-effects-of-activin-a-on-endoplasmic-reticulum-stress-mediated-apoptotic-and-autophagic-pc12-cell-death
#8
Long-Xing Xue, Hong-Yu Liu, Yang Cui, Yue Dong, Jiao-Qi Wang, Qiu-Ye Ji, Jin-Ting He, Min Yao, Ying-Ying Wang, Yan-Kun Shao, Jing Mang, Zhong-Xin Xu
Activin A, a member of the transforming growth factor-beta superfamily, plays a neuroprotective role in multiple neurological diseases. Endoplasmic reticulum (ER) stress-mediated apoptotic and autophagic cell death is implicated in a wide range of diseases, including cerebral ischemia and neurodegenerative diseases. Thapsigargin was used to induce PC12 cell death, and Activin A was used for intervention. Our results showed that Activin A significantly inhibited morphological changes in thapsigargin-induced apoptotic cells, and the expression of apoptosis-associated proteins [cleaved-caspase-12, C/EBP homologous protein (CHOP) and cleaved-caspase-3] and biomarkers of autophagy (Beclin-1 and light chain 3), and downregulated the expression of thapsigargin-induced ER stress-associated proteins [inositol requiring enzyme-1 (IRE1), tumor necrosis factor receptor-associated factor 2 (TRAF2), apoptosis signal-regulating kinase 1 (ASK1), c-Jun N-terminal kinase (JNK) and p38]...
May 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28608237/exogenous-adipokine-peptide-resistin-protects-against-focal-cerebral-ischemia-reperfusion-injury-in-mice
#9
Jiangtao Zhu, Di Wu, Chenyu Zhao, Man Luo, Ronald C Hamdy, Balvin H L Chua, Xingshun Xu, Zhigang Miao
Previous studies have demonstrated that plasma resistin levels were increased in patients with acute ischemic stroke. However, the role of resistin after ischemic brain injury is still unclear. In this study, we investigated the protective effects of resistin on cerebral ischemia/reperfusion injury in a middle cerebral artery occlusion mouse model. We found that resistin (i.c.v.) significantly reduced infarct volume and improved neurological deficits after 45 min of ischemia and 24 h of reperfusion. Furthermore, our data demonstrate that intraperitoneal administration of resistin (10 µg/kg body weight) also had protective effects on infarct volume, indicating the crossing of resistin through the impaired BBB after ischemia injury...
June 12, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28607351/early-oxygen-therapy-does-not-protect-the-brain-from-vasogenic-edema-following-acute-ischemic-stroke-in-adult-male-rats
#10
Elmira Pasban, Hamdollah Panahpour, Akbar Vahdati
Brain edema aggravates primary brain injury and increases its mortality rate after ischemic stroke. It is believed that normobaric oxygen therapy (NBO) may produce neuroprotective effects against ischemic stroke; however, reports have been controversial, and its effects on vasogenic brain edema as a major complication of brain ischemia have not been clarified. The present study investigates the effects of NBO on cerebral edema and blood - brain barrier integrity using rat model of ischemic stroke. Transient focal cerebral ischemia was induced in adult male Sprague-Dawley rats by left middle cerebral artery occlusion (MCAO) for 90 min followed by 24 h reperfusion...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28607169/cdc25a-is-a-critical-mediator-of-ischemic-neuronal-death-in-vitro-and-in-vivo
#11
Grace O Iyirhiaro, Doo Soon Im, Wassamon Boonying, Steve M Callaghan, Matthew J During, Ruth S Slack, David S Park
Dysregulation of cell cycle machinery is implicated in a number of neuronal death contexts, including stroke. Increasing evidence suggests that cyclin-dependent kinases (Cdks) are inappropriately activated in mature neurons under ischemic stress conditions. We previously demonstrated a functional role for cyclin D1/Cdk4/pRb pathway in delayed neuronal death induced by ischemia. However, the molecular signal(s) leading to cyclin D/Cdk4/pRb activation following ischemic insult is presently not clear. Here, we investigate the cell division cycle 25 (Cdc25) dual specificity phosphatases as potential upstream regulators of ischemic neuronal death and Cdk4 activation...
June 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28596571/the-role-of-trpc6-in-the-neuroprotection-of-calycosin-against-cerebral-ischemic-injury
#12
Chao Guo, Yongyuan Ma, Shanbo Ma, Fei Mu, Jiao Deng, Jialin Duan, Lize Xiong, Ying Yin, Yanhua Wang, Miaomaio Xi, Aidong Wen
Our previous studies have provided evidences that calycosin can protect the brain from ischemia/reperfusion injury, but its mechanisms is not fully understand. Transient receptor potential canonical 6 (TRPC6) has a critical role in promoting neuronal survival against cerebral ischemic injury. The aim of the present study is to test whether calycosin protects against cerebral ischemic injury through TRPC6-CREB pathway. In vivo, rats were subjected to transient middle cerebral artery occlusion (MCAO) for 2 h and then treated with different doses of calycosin at the onset of reperfusion...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28592261/trem2-protects-against-cerebral-ischemia-reperfusion-injury
#13
Rong Wu, Xiangpen Li, Pengfei Xu, Likui Huang, Jinping Cheng, Xiaolong Huang, Jingru Jiang, Long-Jun Wu, Yamei Tang
Although post-ischemic inflammation induced by the innate immune response is considered an essential step in the progression of cerebral ischemia injury, the role of triggering receptor expressed on myeloid cells 2 (TREM2) in the pathogenesis of ischemic stroke remains to be elucidated. Here, we found that the transcriptional and post-transcriptional levels of TREM2 were increased in cultured primary microglia after oxygen-glucose deprivation and reoxygenation and in the ischemic penumbra of the cerebral cortex after middle cerebral artery occlusion (MCAO) and reperfusion in mice...
June 7, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28591739/improvement-of-mitochondrial-function-mediated-the-neuroprotective-effect-of-5-4-hydroxy-3-dimethoxybenzylidene-2-thioxo-4-thiazolidinone-in-rats-with-cerebral-ischemia-reperfusion-injuries
#14
Mingyang Wang, Lu Feng, Ji Zheng, Junya Liu, Shujie Fan, Jun Zhao, Nan Yang, Yanyong Liu, Zhanjun Yang, Caiying Ye, Pingping Zuo
Deficits in mitochondrial function is a critical inducement in the major pathways that drive neuronal cell death in ischemic process particularly. Drugs target to improve the mitochondrial function may be a feasible therapeutic choice in treatment with ischemic diseases. In the present study, we investigated whether 5-(4-hydroxy-3-dimethoxybenzylidene)-2-thioxo-4-thiazolidinone (RD-1), a compound derived from rhodanine, could protect against ischemic neuronal damage via improving mitochondrial function. We tested the neuroprotective effect of RD-1 both in rats modeled by middle cerebral artery occlusion reperfusion in vivo and in primary cortical neurons subjected to hypoxia/reperfusion injury in vitro...
May 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28587384/upregulation-of-glutamate-metabolism-by-byhwd-in-cultured-astrocytes-following-oxygen-glucose-deprivation-reoxygenation-in-part-depends-on-the-activation-of-p38-mapk
#15
Peng Yu, Li Guan, Lequan Zhou, Jianchao Guo, Ruixian Guo, Ruishan Lin, Wenting Ding, Xiaoying Li, Wei Liu
Recent studies have demonstrated that Buyang Huanwu Decoction (BYHWD) decreased glutamate levels subsequent to cerebral ischemia. Glutamate transporter-1 (GLT-1) and glutamine synthetase (GS), which are located in astrocytes, mainly contribute to glutamate transportation, thus reducing glutamate concentration. BYHWD has previously been demonstrated to upregulate GLT-1 and GS following ischemia in vivo. However, whether BYHWD can directly influence astrocytic GLT-1/GS levels remains unknown. In the present study, the effect of BYHWD containing serum (BYHWD-CS) on GLT-1/GS levels in astrocytes following oxygen-glucose deprivation/reoxygenation (OGD/R) was investigated...
June 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28585865/protein-kinase-c-epsilon-delays-latency-until-anoxic-depolarization-through-arc-expression-and-glur2-internalization
#16
Charles H Cohan, Holly M Stradecki-Cohan, Kahlilia C Morris-Blanco, Nathalie Khoury, Kevin B Koronowski, Mehdi Youbi, Clinton B Wright, Miguel A Perez-Pinzon
Global cerebral ischemia is a debilitating injury that damages the CA1 region of the hippocampus, an area important for learning and memory. Protein kinase C epsilon (PKCɛ) activation is a critical component of many neuroprotective treatments. The ability of PKCɛ activation to regulate AMPA receptors (AMPARs) remains unexplored despite the role of AMPARs in excitotoxicity after brain ischemia. We determined that PKCɛ activation increased expression of a protein linked to learning and memory, activity-regulated cytoskeleton-associated protein (arc)...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28583178/therapeutic-angiogenesis-of-adipose-derived-stem-cells-for-ischemic-diseases
#17
REVIEW
Lina Zhao, Takerra Johnson, Dong Liu
Ischemic diseases, the leading cause of disability and death, are caused by the stenosis or obstruction of arterioles/capillaries that is not compensated for by vessel dilatation or collateral circulation. Angiogenesis is a complex process leading to new blood vessel formation and is triggered by ischemic conditions. Adequate angiogenesis, as a compensatory mechanism in response to ischemia, may increase oxygen and nutrient supplies to tissues and protect their function. Therapeutic angiogenesis has been the most promising therapy for treating ischemic diseases...
June 5, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28579908/effect-of-different-component-ratio-of-astragalus-total-saponins-and-verbena-total-glycosides-on-the-cerebral-infarction-area-and-serum-biochemical-indicators-in-the-focal-cerebral-ischemia-reperfusion-rat-model
#18
Erping Xu, Shuo Tian, Mingsan Miao, Xiao Cheng
Our purpose is to study the effect of different component ratio of Astragalus Total Saponins (ATS) and Verbena Total Glycosides (VTG) on the cerebral infarction area and the serum biochemical indicators in the focal cerebral ischemia-reperfusion rat model. Compared with the model group, different component ratio of ATS and VTG could significantly improve the neurological deficit scores to the focal cerebral ischemia-reperfusion rat model, and the group of 7:3, 6:4, 5:5 got the best results; it could reduce the mortality of rat model to a certain extent, and the group of 5:5 group got the best results; it can significantly reduce the cerebral infarction area, and the group of 7:3, 5:5, 4:6 got the best results; it could significantly reduce the content of TNF-α, and the group of 8:2, 6:4 got the best results; it could significantly reduce the content of NO, and the group of 7:3, 5:5 got the best results; it could significantly increase the content of SOD, and the group of 6:4, 5:5 got the best results...
May 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28579891/protective-effect-of-chlorogenic-acid-on-the-focal-cerebral-ischemia-reperfusion-rat-models
#19
Mingsan Miao, Lihua Cao, Ruiqi Li, Xiaoyan Fang, Yanyan Miao
OBJECTIVE: The aim of the study was to investigate the protective characteristic of chlorogenic acid, a natural glucosyl xanthone found in Lonicera Japonica on the cerebral ischemia reperfusion injury and the underlying mechanism. METHODS: Focal cerebral ischemia reperfusion model was built by blocking the left middle cerebral artery in rats by using the suture-occluded method. Before operation, the corresponding drugs were given for each group once a day for 7 days...
May 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28574654/neuroprotective-effects-respond-to-cerebral-ischemia-without-susceptibility-to-hb-tumorigenesis-in-vhl-heterozygous-knockout-mice
#20
Ying Wang, Jingyun Yang, Guhong Du, Dexuan Ma, Liangfu Zhou
The von Hippel-Lindau (VHL) tumor suppressor gene plays a prominent role in the development of hemangioblastomas (HBs) within specific regions of the human' central nervous system (CNS). Alterations in VHL gene are rarely observed in the more common features of human VHL-related tumors in animal models, and VHL heterozygous knockout (VHL + / -) mice do not develop HBs. We tested whether VHL heterozygous knockout mice exhibited genetic predisposition to the development of HBs and conferred a selective advantage involving growth of blood vessels to its carrier...
June 2, 2017: Molecular Carcinogenesis
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