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https://www.readbyqxmd.com/read/29651748/improved-reperfusion-and-vasculoprotection-by-the-poly-adp-ribose-polymerase-inhibitor-pj34-after-stroke-and-thrombolysis-in-mice
#1
Mohamad El Amki, Dominique Lerouet, Marie Garraud, Fei Teng, Virginie Beray-Berthat, Bérard Coqueran, Benoît Barsacq, Charlotte Abbou, Bruno Palmier, Catherine Marchand-Leroux, Isabelle Margaill
Benefits from thrombolysis with recombinant tissue plasminogen activator (rt-PA) after ischemic stroke remain limited due to a narrow therapeutic window, low reperfusion rates, and increased risk of hemorrhagic transformations (HT). Experimental data showed that rt-PA enhances the post-ischemic activation of poly(ADP-ribose)polymerase (PARP) which in turn contributes to blood-brain barrier injury. The aim of the present study was to evaluate whether PJ34, a potent PARP inhibitor, improves poor reperfusion induced by delayed rt-PA administration, exerts vasculoprotective effects, and finally increases the therapeutic window of rt-PA...
April 12, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29649465/therapeutic-time-window-and-regulation-of-autophagy-by-mild-hypothermia-after-intracerebral-hemorrhage-in-rats
#2
Feifei Song, Cen Guo, Yang Geng, Xuqing Wu, Wei Fan
Although recent studies have shown that mild hypothermia has neuroprotective effects on intracerebral hemorrhage (ICH), the therapeutic time window of the therapy and the role of autophagy as a potential neuroprotective mechanism remain unclear. This study was aimed to investigate the appropriate time window of mild hypothermia and the regulation of autophagy during the treatment in a rat model of autologous blood-injected ICH injury. The rats were divided into Sham, normothermic (NT) and hypothermic (HT) groups...
April 9, 2018: Brain Research
https://www.readbyqxmd.com/read/29648978/fgf21-protects-the-blood-brain-barrier-by-upregulating-ppar%C3%AE-via-fgfr1-%C3%AE-klotho-following-traumatic-brain-injury
#3
Jun Chen, Jian Hu, Huan Liu, Ye Xiong, Yuchi Zou, Wenting Huang, Mingjie Shao, Jiamin Wu, Li Yu, Xiaojie Wang, Xue Wang, Li Lin
Blood-brain barrier (BBB) disruption and dysfunction result in brain edema, which is responsible for more than half of all deaths after severe traumatic brain injury (TBI). Fibroblast growth factor 21 (FGF21) has a potential neuroprotective function in the brain. However, the effects and underlying possible mechanism of action on BBB integrity following TBI remain unknown. The purpose of the current study was to determine the effects of FGF21 on BBB protection and TBI treatment. The effects of recombinant human FGF21 (rhFGF21) on BBB integrity and on tight junction and adherens junction proteins were investigated both in a TBI mouse model and an in vitro BBB disruption model established with TNF-α-induced human brain microvascular endothelial cells (HBMECs)...
March 6, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29629621/pdgfr-%C3%AE-restores-blood-brain-barrier-functions-in-a-mouse-model-of-focal-cerebral-ischemia
#4
Jie Shen, Guihua Xu, Runxiu Zhu, Jun Yuan, Yoko Ishii, Takeru Hamashima, Takako Matsushima, Seiji Yamamoto, Yusuke Takatsuru, Junichi Nabekura, Masakiyo Sasahara
Although platelet-derived growth factor receptor beta (PDGFR-β) mediates the recruitment of vascular pericytes into ischemic lesion to restore the blood-brain barrier (BBB) dysfunction, its mechanisms still remain elusive . Compared with control PDGFR-βfloxed / floxed mice (Floxed), postnatally induced systemic PDGFR-β knockout mice (Esr-KO) not only showed severe brain edema, neurologic functional deficits, decreased expression of tight junction (TJ) proteins, abundant endothelial transcytosis, and deformed TJs in the BBB, but also showed reduced expression of transforming growth factor-β (TGF-β) protein after photothrombotic middle cerebral artery occlusion (MCAO)...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29600431/effectiveness-of-arginase-inhibitors-against-experimentally-induced-stroke
#5
Waleed Barakat, Ahmad Fahmy, Mohamed Askar, Sherif El-Kannishy
Stroke is a lethal disease, but it disables more than it kills. Stroke is the second leading cause of death and the most frequent cause of permanent disability in adults worldwide, with 90% of survivors having residual deficits. The pathophysiology of stroke is complex and involves a strong inflammatory response associated with oxidative stress and activation of several proteolytic enzymes. The current study was designed to investigate the effect of arginase inhibitors (L-citruline and L-ornithine) against ischemic stroke induced in rats by middle cerebral artery occlusion (MCAO)...
March 29, 2018: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29599893/pretreatment-with-shuanghe-tang-extract-attenuates-postischemic-brain-injury-and-edema-in-a-mouse-model-of-stroke-an-analysis-of-medicinal-herbs-listed-in-dongui-bogam
#6
Min Jae Kim, Seo-Yeon Lee, Ji Young Hwang, Hyunha Kim, Ki-Tae Ha, Byung Tae Choi, Jin Ung Baek, Hwa Kyoung Shin
Aim: Although stroke is among the leading causes of death and long-term disability, there are few effective treatments for limiting the severity of neurological sequelae. We evaluated the effects of 29 medicinal herbs listed in the Pung chapter of the 17th century Korean medical text Dongui Bogam on stroke symptoms in a mouse model of cerebral ischemia. Methods: Focal cerebral ischemia was induced via photothrombosis. Infarct volume, brain edema, and neurological deficits were evaluated...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29596475/sensitivity-of-different-mri-sequences-in-the-early-detection-of-melanoma-brain-metastases
#7
Katerina Deike-Hofmann, Daniel Thünemann, Michael O Breckwoldt, Daniel Schwarz, Alexander Radbruch, Alexander Enk, Martin Bendszus, Jessica Hassel, Heinz-Peter Schlemmer, Philipp Bäumer
BACKGROUND: After the emergence of new MRI techniques such as susceptibility- and diffusion-weighted imaging (SWI and DWI) and because of specific imaging characteristics of melanoma brain metastases (MBM), it is unclear which MRI sequences are most beneficial for detection of MBM. This study was performed to investigate the sensitivity of six clinical MRI sequences in the early detection of MBM. METHODS: Medical records of all melanoma patients referred to our center between November 2005 and December 2016 were reviewed for presence of MBM...
2018: PloS One
https://www.readbyqxmd.com/read/29588233/postpartum-increases-in-cerebral-edema-and-inflammation-in-response-to-placental-ischemia-during-pregnancy
#8
Ahsia M Clayton, Qingmei Shao, Nina D Paauw, Ashtin B Giambrone, Joey P Granger, Junie P Warrington
Reduced placental blood flow results in placental ischemia, an initiating event in the pathophysiology of preeclampsia, a hypertensive pregnancy disorder. While studies show increased mortality risk from Alzheimer's disease, stroke, and cerebrovascular complications in women with a history of preeclampsia, the underlying mechanisms are unknown. During pregnancy, placental ischemia, induced by reducing uterine perfusion pressure (RUPP), leads to cerebral edema and increased blood-brain barrier (BBB) permeability; however whether these complications persist after delivery is not known...
March 24, 2018: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/29578526/an-in-vivo-assessment-of-blood-brain-barrier-disruption-in-a-rat-model-of-ischemic-stroke
#9
Hamdollah Panahpour, Mehdi Farhoudi, Yadollah Omidi, Javad Mahmoudi
Ischemic stroke leads to vasogenic cerebral edema and subsequent primary brain injury, which is mediated through destruction of the blood-brain barrier (BBB). Rats with induced ischemic stroke were established and used as in vivo models to investigate the functional integrity of the BBB. Spectrophotometric detection of Evans blue (EB) in the brain samples with ischemic injury could provide reliable justification for the research and development of novel therapeutic modalities. This method generates reproducible results, and is applicable in any laboratory without a need for special equipment...
March 11, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29576714/rhubarb-attenuates-cerebral-edema-via-inhibition-of-the-extracellular-signal-regulated-kinase-pathway-following-traumatic-brain-injury-in-rats
#10
Zhaoyu Yang, Rong Fan, Peng Sun, Hanjin Cui, Weijun Peng, Jiekun Luo, Chunhu Zhang, Xingui Xiong, Wei Huang, Wei Liu
Background: Rhubarb is a traditional Chinese medicine for treating traumatic brain injury (TBI). Purpose: The purpose of this study is to elucidate the potential mechanism of rhubarb by suppressing extracellular signal-regulated kinase (ERK) to ameliorate brain edema. Materials and Methods: Sprague-Dawley rats were separated into four groups at random. One group received 3 g/kg rhubarb, and another group received 12 g/kg rhubarb, and the vehicle group and sham group were administered the same dose of saline solution...
January 2018: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29569703/histopathological-changes-in-the-choroid-plexus-after-traumatic-brain-injury-in-the-rats-a-histologic-and-immunohistochemical-study
#11
Hüseyin Özevren, Engin Deveci, Mehmet Cudi Tuncer
Traumatic brain injury (TBI) is in part associated with the disruption of the blood-brain barrier. In this study, we analyzed the histopathological changes in E-cadherin and VEGF expression after traumatic brain injury in rats. The rats were divided into 2 groups as the control and the trauma groups. Sprague-Dawley rats were subjected to traumatic brain injury with a weight-drop device using 300 g⁻¹ m weight-height impact. After 5 days of traumatic brain injury, blood samples were taken under ketamine hydroxide anesthesia and biochemical analyzes were performed...
March 23, 2018: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/29569041/non-invasive-multimodality-imaging-directly-shows-trpm4-inhibition-ameliorates-stroke-reperfusion-injury
#12
Bo Chen, Gandi Ng, Yahui Gao, See Wee Low, Edwin Sandanaraj, Boominathan Ramasamy, Sakthivel Sekar, Kishore Bhakoo, Tuck Wah Soong, Bernd Nilius, Carol Tang, Edward G Robins, Julian Goggi, Ping Liao
The transient receptor potential melastatin 4 (TRPM4) channel has been suggested to play a key role in the treatment of ischemic stroke. However, in vivo evaluation of TRPM4 channel, in particular by direct channel suppression, is lacking. In this study, we used multimodal imaging to assess edema formation and quantify the amount of metabolically functional brain salvaged after a rat model of stroke reperfusion. TRPM4 upregulation in endothelium emerges as early as 2 h post-stroke induction. Expression of TRPM4 channel was suppressed directly in vivo by treatment with siRNA; scrambled siRNA was used as a control...
March 22, 2018: Translational Stroke Research
https://www.readbyqxmd.com/read/29568904/roles-of-elevated-20%C3%A2-hete-in-the-breakdown-of-blood-brain-barrier-and-the-severity-of-brain-edema-in-experimental-traumatic-brain-injury
#13
Liyan Lu, Mingliang Wang, Fang Yuan, Xiaoer Wei, Wenbin Li
Breakdown of the blood brain barrier (BBB) is a secondary injury following traumatic brain injury (TBI) and can lead to the development of brain edema. However, the factors that contribute to the disruption of the BBB and increase the severity of brain edema in TBI remain to be elucidated. 20‑hydroxyeicosatetraenoic acid (20‑HETE) is a metabolite of arachidonic acid. The inhibition of 20‑HETEsynthesis by HET0016 has been suggested as a strategy to decrease brain edema. The present study aimed to investigate whether the elevated production of 20‑HETE in cerebral tissue may contribute to BBB breakdown and increase the severity of brain edema in rats with TBI...
May 2018: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29550901/therapeutic-potential-of-pretreatment-with-allograft-sertoli-cells-transplantation-in-brain-ischemia-by-improving-oxidative-defenses
#14
Sara Milanizadeh, Karrar Najm Najaf Zuwarali, Abbas Aliaghaei, Mohammad Reza Bigdeli
Brain ischemia is one of the most common causes of death and disability worldwide, which usually happens through diminished blood supply to the tissue. Cell therapy and treatments using trophic factors are some of the new methods to protect brain cells against damage. Specific properties of Sertoli cells (SCs) make them suitable for improving neurological disorders. This study is to evaluate possible neuroprotective effects of SCs transplantation on ischemic damage. Rats were divided into three experimental groups including sham, control, and SCs-treated group...
March 17, 2018: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29518365/rack1-upregulation-induces-neuroprotection-by-activating-the-ire1-xbp1-signaling-pathway-following-traumatic-brain-injury-in-rats
#15
Haibo Ni, Qin Rui, Yitian Xu, Jun Zhu, Fan Gao, Baoqi Dang, Di Li, Rong Gao, Gang Chen
Receptor for activated protein kinase C 1 (RACK1) is a multifaceted scaffolding protein known to be involved in the regulation of signaling events required for neuronal protection. In the present study, we investigated the role of RACK1 in secondary brain injury in a rat traumatic brain injury (TBI) model. A weight-drop TBI model was established in Sprague Dawley rats, and RACK1 in vivo knockdown and overexpression were performed 24 h before TBI insult. The IRE1 inhibitor 3,5-dibromosalicylaldehyde (DBSA) was administered by intracerebroventricular injection 1 h after TBI insult...
March 5, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29517828/prior-treatment-with-anti-high-mobility-group-box-1-antibody-boosts-human-neural-stem-cell-transplantation-mediated-functional-recovery-after-spinal-cord-injury
#16
Naohiro Uezono, Yicheng Zhu, Yusuke Fujimoto, Tetsuro Yasui, Taito Matsuda, Masahide Nakajo, Masahiko Abematsu, Takao Setoguchi, Shuji Mori, Hideo K Takahashi, Setsuro Komiya, Masahiro Nishibori, Kinichi Nakashima
Together with residual host neurons, transplanted neural stem cell (NSC)-derived neurons play a critical role in reconstructing disrupted neural circuits after spinal cord injury (SCI). Since a large number of tracts are disrupted and the majority of host neurons die around the lesion site as the damage spreads, minimizing this spreading and preserving the lesion site are important for attaining further improvements in reconstruction. High mobility group box-1 (HMGB1) is a damage-associated molecular pattern protein that triggers sterile inflammation after tissue injury...
March 8, 2018: Stem Cells
https://www.readbyqxmd.com/read/29515421/central-variant-posterior-reversible-encephalopathy-syndrome-with-albuminocytologic-dissociation
#17
Sang-Woo Lee, Seung-Jae Lee
Posterior reversible encephalopathy syndrome (PRES) is a disorder of reversible vasogenic brain edema which mainly involves the parieto-occipital lobes in various clinical settings. The main mechanism is known to be cerebral autoregulation failure and endothelial dysfunction leading to the disruption of the blood-brain barrier. We report the case of a 47-year-old woman with PRES which involved the brain stem and thalami, sparing the cerebral hemispheres. She was admitted to the emergency room because of acute-onset confusion...
January 2018: Case Reports in Neurology
https://www.readbyqxmd.com/read/29511497/role-of-melatonin-receptors-in-the-effect-of-estrogen-on-brain-edema-intracranial-pressure-and-expression-of-aquaporin-4-after-traumatic-brain-injury
#18
Nader Shahrokhi, Mohammad Khaksari, Gholamreza AsadiKaram, Zahra Soltani, Nava Shahrokhi
Objectives: Traumatic brain injury (TBI) is one of the most common causes of death and disability in modern societies. The role of steroids and melatonin is recognized as a neuroprotective factor in traumatic injuries. This study examined the role of melatonin receptors in the neuroprotective effects of estrogen. Materials and Methods: Seventy female ovariectomized Wistar rats were divided into five groups and two subgroups. All animals underwent brain trauma. The groups were as follow: 1) trauma, 2) melatonin receptor antagonist vehicle + estrogen, 3) MT1 melatonin receptor antagonist + estrogen, 4) MT2 melatonin receptor antagonist+ estrogen, 5) MT3 melatonin receptor antagonist+ estrogen...
March 2018: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29508280/the-dynamics-of-impaired-blood-brain-barrier-restoration-in-a-rat-model-of-co-morbid-injury
#19
Zareen Amtul, Jun Yang, Simona Nikolova, Ting-Yim Lee, Robert Bartha, David F Cechetto
Defect in brain microperfusion is increasingly recognized as an antecedent event to Alzheimer's disease (AD) and ischemia. Nevertheless, studies on the role of impaired microperfusion as a pathological trigger to neuroinflammation, Aβ deposition as well as blood-brain barrier (BBB) disruption, and the etiological link between AD and ischemia are lacking. In this study, we employ in vivo sequential magnetic resonance imaging (MRI) and computed tomography (CT) imaging in a co-morbid rat model of β-amyloid toxicity (Aβ) and ischemia (ET1) with subsequent histopathology of striatal lesion core and penumbra at 1, 7, and 28 days post injury...
March 5, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29493140/-cerebral-vascular-protective-effect-of-ginkgo-diterpene-lactone-meglumine-injection
#20
Zhuo-Qiong Li, Ze-Yu Cao, Liang Cao, Zhi-Peng Ke, Zhen-Zhong Wang, Wei Xiao
The left middle cerebral artery occlusion (MCAO) model was made by inserting the nylon thread plug into the internal carotid artery. The behavioral score, cerebral infarction area, brain water content, ethidium bromide (EB) spillover, coagulation four indices, occludin and MMP-9 expression in brain tissues were detected after 14 days of administration, to investigate whether the protective effect of ginkgo diterpene lactone meglumine injection (GDLMI) which had obvious protective effect on cerebral ischemic injury in the previous experiment was related to reducing the permeability of the blood-brain barrier (BBB) and reducing the risk of bleeding, and to explore its possible mechanism of action...
December 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
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