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https://www.readbyqxmd.com/read/28210215/tryptanthrin-suppresses-the-activation-of-the-lps-treated-bv2-microglial-cell-line-via-nrf2-ho-1-antioxidant-signaling
#1
Young-Won Kwon, So Yeong Cheon, Sung Yun Park, Juhyun Song, Ju-Hee Lee
Microglia are the resident macrophages in the central nervous system (CNS) and play essential roles in neuronal homeostasis and neuroinflammatory pathologies. Recently, microglia have been shown to contribute decisively to neuropathologic processes after ischemic stroke. Furthermore, natural compounds have been reported to attenuate inflammation and pathologies associated with neuroinflammation. Tryptanthrin (indolo[2,1-b]quinazoline-6,12-dione) is a phytoalkaloid with known anti-inflammatory effects in cells...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28203483/galanin-protects-from-caspase-8-12-initiated-neuronal-apoptosis-in-the-ischemic-mouse-brain-via-galr1
#2
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/28202414/lncrna-tug1-sponges-microrna-9-to-promote-neurons-apoptosis-by-up-regulated-bcl2l11-under-ischemia
#3
Shengcai Chen, Mengdie Wang, Hang Yang, Ling Mao, Quanwei He, Huijuan Jin, Zi-Ming Ye, Xue-Ying Luo, Yuan-Peng Xia, Bo Hu
Emerging studies have illustrated that LncRNAs TUG1 play critical roles in multiple biologic processes. However, the LncRNA TUG1 expression and function in ischemic stroke have not been reported yet. In this study, we found that LncRNA TUG1 expression was significantly up-regulated in brain ischemic penumbra from rat middle carotid artery occlusion (MCAO) model, while similar results were also observed in cultured neurons under oxygen-glucose deprivation (OGD) insult. Knockdown of TUG1 decreased the ratio of apoptotic cells and promoted cells survival in vitro, which may be regulated by the elevated miRNA-9 expression and decreased Bcl2l11 protein...
February 12, 2017: Biochemical and Biophysical Research Communications
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
#4
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/28192195/puerarin-provides-a-neuroprotection-against-transient-cerebral-ischemia-by-attenuating-autophagy-at-the-ischemic-penumbra-in-neurons-but-not-in-astrocytes
#5
He Hongyun, Guo Tao, Zhang Pengyue, Yang Liqiang, Deng Yihao
Puerarin is an isoflavone derived from the Chinese medical herb of Radix puerariae (kudzu root), and has been widely used in the treatment for ischemic stroke in China. However, its underlying pharmacological mechanisms are still not understood. This study was to investigate the efficacy of puerarin on autophagy in the ischemic penumbra after cerebral stroke. A model of cerebral stroke in Sprague-Dawley rats was prepared by middle cerebral artery occlusion (MCAO); rats were then randomly divided into 5 groups: MCAO+Pue group (rats were treated with puerarin), MCAO+Pue+Tat-Beclin-1 group (rats were administrated with both puerarin and autophagy inducer Tat-Beclin-1), MCAO+Tat-Beclin-1 group (rats were treated with Tat-Beclin-1), MCAO+saline group (rats were administrated with the same volume of physiological saline), and sham surgery group...
February 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28190474/salvianolic-acid-a-inhibits-calpain-activation-and-enos-uncoupling-during-focal-cerebral-ischemia-in-mice
#6
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/28186672/bladder-transplantation-of-amniotic-fluid-stem-cell-may-ameliorate-bladder-dysfunction-after-focal-cerebral-ischemia-in-rat
#7
Ching-Chung Liang, S W Steven Shaw, Yung-Hsin Huang, Yi-Hao Lin, Tsong-Hai Lee
The objective is to investigate whether human amniotic fluid stem cells (hAFSCs) grafting into the bladder may influence bladder functional and molecular changes in an animal stroke model. Female rats were divided into three groups: sham, middle cerebral artery occlusion (MCAO) alone, and MCAO plus 1 × 10(6) hAFSCs transplanting into bladder wall. Bladder function was analyzed by cystometry at days 3 and 10 after MCAO. The expressions of bladder nerve growth factor (NGF), M2-muscarinic, M3-muscarinic, and P2X1 receptors were measured by immunohistochemistry and real-time polymerase chain reaction...
January 3, 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28186440/britanin-ameliorates-cerebral-ischemia-reperfusion-injury-by-inducing-the-nrf2-protective-pathway
#8
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
#9
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/28182727/evolution-of-ischemic-damage-and-behavioural-deficit-over-6-months-after-mcao-in-the-rat-selecting-the-optimal-outcomes-and-statistical-power-for-multi-centre-preclinical-trials
#10
Sarah S J Rewell, Leonid Churilov, T Kate Sidon, Elena Aleksoska, Susan F Cox, Malcolm R Macleod, David W Howells
Key disparities between the timing and methods of assessment in animal stroke studies and clinical trial may be part of the reason for the failure to translate promising findings. This study investigates the development of ischemic damage after thread occlusion MCAo in the rat, using histological and behavioural outcomes. Using the adhesive removal test we investigate the longevity of behavioural deficit after ischemic stroke in rats, and examine the practicality of using such measures as the primary outcome for future studies...
2017: PloS One
https://www.readbyqxmd.com/read/28181779/elevated-brain-derived-neurotrophic-factor-bdnf-levels-in-plasma-but-not-serum-reflect-in-vivo-functional-viability-of-infused-mesenchymal-stem-cells-after-middle-cerebral-artery-occlusion-in-rat
#11
Hideyuki Nakamura, Yuichi Sasaki, Masanori Sasaki, Yuko Kataoka-Sasaki, Shinichi Oka, Masahito Nakazaki, Takahiro Namioka, Ai Namioka, Rie Onodera, Junpei Suzuki, Hiroshi Nagahama, Takeshi Mikami, Masahiko Wanibuchi, Jeffery D Kocsis, Osamu Honmou
BACKGROUND: Intravenous infusion of mesenchymal stem cells (MSCs) derived from adult bone marrow elicits functional recovery in rat stroke models and clinical studies in patients are ongoing. Brain derived neurotrophic factor (BDNF) is a neurotrophic factor produced by MSCs and may contribute to their therapeutic efficacy. The purpose of the current study was to determine if BDNF is elevated in infarcted brain and in which compartment of blood (plasma or serum) after intravenous MSC infusion in a middle cerebral artery occlusion (MCAO) model in the rat...
February 8, 2017: Journal of Neurosurgical Sciences
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
#12
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/28178289/eupatilin-exerts-neuroprotective-effects-in-mice-with-transient-focal-cerebral-ischemia-by-reducing-microglial-activation
#13
Arjun Sapkota, Bhakta Prasad Gaire, Kyu Suk Cho, Se Jin Jeon, Oh Wook Kwon, Dae Sik Jang, Sun Yeou Kim, Jong Hoon Ryu, Ji Woong Choi
Microglial activation and its-driven neuroinflammation are characteristic pathogenetic features of neurodiseases, including focal cerebral ischemia. The Artemisia asiatica (Asteraceae) extract and its active component, eupatilin, are well-known to reduce inflammatory responses. But the therapeutic potential of eupatilin against focal cerebral ischemia is not known, along with its anti-inflammatory activities on activated microglia. In this study, we investigated the neuroprotective effect of eupatilin on focal cerebral ischemia through its anti-inflammation, particularly on activated microglia, employing a transient middle cerebral artery occlusion/reperfusion (tMCAO), combined with lipopolysaccharide-stimulated BV2 microglia...
2017: PloS One
https://www.readbyqxmd.com/read/28174043/sodium-influx-through-cerebral-sodium-glucose-transporter-type-1-exacerbates-the-development-of-cerebral-ischemic-neuronal-damage
#14
Yui Yamazaki, Shinichi Harada, Tetsuyuki Wada, Teruki Hagiwara, Shigeru Yoshida, Shogo Tokuyama
We recently reported that cerebral sodium-glucose transporter type 1 (SGLT-1) plays a role in exacerbation of cerebral ischemia. However, the mechanism by which cerebral SGLT-1 acts remains unclear. Here we demonstrated that sodium influx through cerebral SGLT-1 exacerbates cerebral ischemic neuronal damage. SGLT-specific sodium ion influx was induced using α-methyl-D-glucopyranoside (α-MG). Intracellular sodium concentrations in primary cortical neurons were estimated using sodium-binding benzofuran isophthalate fluorescence...
February 4, 2017: European Journal of Pharmacology
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
#15
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/28168001/the-neuroprotective-effects-of-tao-ren-cheng-qi-tang-against-embolic-stroke-in-rats
#16
Ling-Wei Hsu, Wei-Cheng Shiao, Nen-Chung Chang, Meng-Che Yu, Ting-Lin Yen, Philip Aloysius Thomas, Thanasekaran Jayakumar, Joen-Rong Sheu
BACKGROUND: Combinations of the traditional Chinese and Western medicines have been used to treat numerous diseases throughout the world, and there is a growing body of evidence showing that some of the herbs used in traditional Chinese medicine elicit significant pharmacological effects. The aim of this study was to demonstrate the neuroprotective effects of Tao-Ren-Cheng-Qi Tang (TRCQT) in combination with aspirin following middle cerebral artery occlusion (MCAO)-induced embolic stroke in rats...
2017: Chinese Medicine
https://www.readbyqxmd.com/read/28165057/a-novel-indication-of-platonin-a-therapeutic-immunomodulating-medicine-on-neuroprotection-against-ischemic-stroke-in-mice
#17
Joen-Rong Sheu, Zhih-Cherng Chen, Thanasekaran Jayakumar, Duen-Suey Chou, Ting-Lin Yen, Hsing-Ni Lee, Szu-Han Pan, Chih-Hsuan Hsia, Chih-Hao Yang, Cheng-Ying Hsieh
Thrombosis and stroke are major causes of disability and death worldwide. However, the regular antithrombotic drugs may have unsatisfactory results and side effects. Platonin, a cyanine photosensitizing dye, has been used to treat trauma, ulcers and some acute inflammation. Here, we explored the neuroprotective effects of platonin against middle cerebral artery occlusion (MCAO)-induced ischemic stroke in mice. Platonin(200 μg/kg) substantially reduced cerebral infarct volume, brain edema, neuronal cell death and neurological deficit scores, and improved the MCAO-reduced locomotor activity and rotarod performance...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28154249/innovations-in-liposomal-dds-technology-and-its-application-for-the-treatment-of-various-diseases
#18
REVIEW
Naoto Oku
Liposomes have been widely used as drug carriers in the field of drug delivery systems (DDS), and they are thought to be ideal nano-capsules for targeting DDS after being injected into the bloodstream. In general, DDS drugs meet the needs of aged and super-aged societies, since the administration route of drugs can be changed, the medication frequency reduced, the adverse effects of drugs suppressed, and so on. In fact, a number of liposomal drugs have been launched and used worldwide including liposomal anticancer drugs, and these drugs have appeared on the market owing to various innovations in liposomal DDS technologies...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28133527/time-course-of-neuroprotection-induced-by-in-vivo-normobaric-hyperoxia-preconditioning-and-angiogenesis-factors
#19
Meisam Shahhoseini, Mohammad Reza Bigdeli
OBJECTIVES: Every year, a large number of people lose their lives due to stroke. Stroke is the second leading cause of death worldwide. Surprisingly, recent studies have shown that preconditioning with hyperoxia (HO) increases tissue tolerance to ischemia, ultimately reducing damages caused by stroke. Addressed in this study are beneficial contributions from HO preconditioning into reduced harm to be incurred by the attack, as well as its effect on the expression levels of vascular endothelial growth factor (VEGF) and endostatin...
January 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/28132912/involvement-of-arterial-baroreflex-and-nicotinic-acetylcholine-receptor-%C3%AE-7-subunit-pathway-in-the-protection-of-metformin-against-stroke-in-stroke-prone-spontaneously-hypertensive-rats
#20
Jin-Min Guo, Li Zhang, Xue-Cai Niu, He Shu, Lei Wang, Ding-Feng Su, Ying Zhang, Ai-Jun Liu, De-Qiu Zhu, Jian-Jiang Xu
Stroke is a leading cause of mortality and disability worldwide. There is growing evidence that metformin (Met) has potent neuroprotective effects; however, its mechanisms remain unclear. We examined the role of the arterial baroreflex and cholinergic-α7 nicotinic acetylcholine receptor (α7nAChR) anti-inflammory pathway in the beneficial effects of Met against stroke. Stroke-prone spontaneously hypertensive rats (SHRSP) were used to observe stroke development indicated by lifespan of SHRSP and the ischemic injury induced by permanent middle cerebral artery occlusion (MCAO)...
January 26, 2017: European Journal of Pharmacology
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