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Biology of stroke

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https://www.readbyqxmd.com/read/28212842/pathophysiological-consequences-of-receptor-mistraffic-tales-from-the-platelet-p2y12-receptor
#1
Margaret R Cunningham, Riyaad Aungraheeta, Stuart J Mundell
Genetic variations in G protein-coupled receptor (GPCR) genes can disrupt receptor function in a wide variety of human genetic diseases, including platelet bleeding disorders. Platelets are critical for haemostasis with inappropriate platelet activation leading to the development of arterial thrombosis, which can result in heart attack and stroke whilst decreased platelet activity is associated with an increased risk of bleeding. GPCRs expressed on the surface of platelets play key roles in regulating platelet activity and therefore function...
February 14, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28211170/endothelial-glycocalyx-as-a-critical-signalling-platform-integrating-the-extracellular-haemodynamic-forces-and-chemical-signalling
#2
REVIEW
Ye Zeng
The glycocalyx covers the human mammalian cells and plays important roles in stroke, inflammation and atherosclerosis. It has also been shown to be involved in endothelial mechanotransduction of shear stress. Shear stress induces the remodelling of the major component of the glycocalyx including glypican-1, a cell membrane heparan sulphate proteoglycan. Other factors, such as sphingosine-1-phosphate (S1P), protect the glycocalyx against syndecan-1 ectodomain shedding and induce the synthesis of heparan sulphate...
February 17, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28210337/extraction-of-knowledge-from-the-topographic-attentive-mapping-network-and-its-application-in-skill-analysis-of-table-tennis
#3
Isao Hayashi, Masanori Fujii, Toshiyuki Maeda, Jasmin Leveille, Tokio Tasaka
The Topographic Attentive Mapping (TAM) network is a biologically-inspired classifier that bears similarities to the human visual system. In case of wrong classification during training, an attentional top-down signal modulates synaptic weights in intermediate layers to reduce the difference between the desired output and the classifier's output. When used in a TAM network, the proposed pruning algorithm improves classification accuracy and allows extracting knowledge as represented by the network structure...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28205497/critical-motor-involvement-in-prediction-of-human-and-non-biological-motion-trajectories
#4
Matthieu M de Wit, Laurel J Buxbaum
OBJECTIVES: Adaptive interaction with the environment requires the ability to predict both human and non-biological motion trajectories. Prior accounts of the neurocognitive basis for prediction of these two motion classes may generally be divided into those that posit that non-biological motion trajectories are predicted using the same motor planning and/or simulation mechanisms used for human actions, and those that posit distinct mechanisms for each. Using brain lesion patients and healthy controls, this study examined critical neural substrates and behavioral correlates of human and non-biological motion prediction...
February 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28202414/lncrna-tug1-sponges-microrna-9-to-promote-neurons-apoptosis-by-up-regulated-bcl2l11-under-ischemia
#5
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/28192232/real-time-quantification-of-subcellular-h202-and-glutathione-redox-potential-in-living-cardiovascular-tissues
#6
Emiliano Panieri, Carlo Millia, Massimo M Santoro
Detecting and measuring the dynamic redox events that occur in vivo is a prerequisite for understanding the impact of oxidants and redox events in normal and pathological conditions. These aspects are particularly relevant in cardiovascular tissues wherein alterations of the redox balance are associated with stroke, aging, and pharmacological intervention. An ambiguous aspect of redox biology is how redox events occur in subcellular organelles including mitochondria, and nuclei. Genetically-encoded Rogfp2 fluorescent probes have become powerful tools for real-time detection of redox events...
February 10, 2017: Free Radical Biology & Medicine
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
#7
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 9, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28187350/conformational-selection-and-induced-fit-as-a-useful-framework-for-molecular-motor-mechanisms
#8
REVIEW
Eric A Galburt, Eric J Tomko
The linkage between macromolecular binding and conformational change that is ubiquitous in biological molecules can be understood in the context of the mechanisms of conformational selection and induced fit. Here, we explore mappings between these mechanisms of ligand binding and those underlying the translocation of molecular motors and the nucleic acid unwinding of helicases. The mechanism of biased motion exhibited by molecular motors is typically described as either a thermal ratchet or a power-stroke and nucleic acid helicases are characterized by either active or passive unwinding mechanisms...
February 3, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/28168953/stroke-disclosing-primary-aldosteronism-report-on-three-cases-and-review-of-the-literature
#9
Amina Nasri, Malek Mansour, Zeineb Brahem, Amel Kacem, Ahmed Abou Hassan, Hager Derbali, Meriem Messelmani, Jamel Zaouali, Ridha Mrissa
OBJECTIVES: There is a growing evidence of increased risk of cerebrovascular events in primary aldosteronism (PA). Nevertheless, acute neurologic ailment as presenting feature of PA is uncommon. Our aim is to highlight the diagnosis challenges in stroke unmasking PA and to discuss the underlying physiopathology and management dilemmas. MATERIALS AND METHODS: We hereby describe three consecutive rare cases of stroke revealing PA. All patients had brain imaging and thorough biological and morphological assessment to rule out other etiologies of stroke...
February 3, 2017: Annales D'endocrinologie
https://www.readbyqxmd.com/read/28163132/aging-leads-to-altered-microglial-function-that-reduces-brain-resiliency-increasing-vulnerability-to-neurodegenerative-diseases
#10
Paula C Bickford, Antwoine Flowers, Bethany Grimmig
Aging is the primary risk factor for many neurodegenerative diseases. Thus, understanding the basic biological changes that take place with aging that lead to the brain being less resilient to disease progression of neurodegenerative diseases such as Parkinson's disease or Alzheimer's disease or insults to the brain such as stroke or traumatic brain injuries. Clearly this will not cure the disease per se, yet increasing the ability of the brain to respond to injury could improve long term outcomes. The focus of this review is examining changes in microglia with age and possible therapeutic interventions involving the use of polyphenol rich dietary supplements...
February 2, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28160212/phthalides-distribution-in-nature-chemical-reactivity-synthesis-and-biological-activity
#11
Alejandra León, Mayela Del-Ángel, José Luis Ávila, Guillermo Delgado
Phthalides are a relatively small group of natural compounds confined to several plant families and some genera of fungi and liverworts. They are divided into two structural groups, the monomeric and dimeric phthalides, and known mainly as bioactive constituents of different plant species used traditionally for medicinal purposes in Asia, Europe, and North America.The first reports on the chemistry of phthalides appeared at the end of the nineteenth century, in which they were identified as the odor constituents of the essential oil of celery (Apium graveolens) by Ciamician and Silber (1897)...
2017: Progress in the Chemistry of Organic Natural Products
https://www.readbyqxmd.com/read/28156174/seasonal-variation-in-spontaneous-intracerebral-hemorrhage-in-northern-israel
#12
G Telman, G E Sviri, E Sprecher, Y Amsalem, R Avizov
The incidence of spontaneous intracerebral hemorrhage (sICH) and ischemic stroke vary across seasons. Most studies examining seasonal variation in sICH have been conducted in countries with significant climatic changes across seasons, whereas studies from the Mediterranean region, which has a relatively mild winter, are limited in number and have produced inconsistent results. Further studies from the region are called for, especially from countries where sICH seasonality has not yet been explored. A total of 974 patients with sICH between 1 January 2000 and 31 December 2014 were included in this study...
February 3, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28154097/cerebral-vascular-disease-and-neurovascular-injury-in-ischemic-stroke
#13
Xiaoming Hu, T Michael De Silva, Jun Chen, Frank M Faraci
The consequences of cerebrovascular disease are among the leading health issues worldwide. Large and small cerebral vessel disease can trigger stroke and contribute to the vascular component of other forms of neurological dysfunction and degeneration. Both forms of vascular disease are driven by diverse risk factors, with hypertension as the leading contributor. Despite the importance of neurovascular disease and subsequent injury after ischemic events, fundamental knowledge in these areas lag behind our current understanding of neuroprotection and vascular biology in general...
February 3, 2017: Circulation Research
https://www.readbyqxmd.com/read/28139706/identification-of-mirna-lncrna-and-mrna-associated-cerna-networks-and-potential-biomarker-for-melas-with-mitochondrial-dna-a3243g-mutation
#14
Wei Wang, Qianqian Zhuang, Kunqian Ji, Bing Wen, Pengfei Lin, Yuying Zhao, Wei Li, Chuanzhu Yan
Researchers in the field of mitochondrial biology are increasingly unveiling of the complex mechanisms between mitochondrial dysfunction and noncoding RNAs (ncRNAs). However, roles of ncRNAs underlying mitochondrial myopathy remain unexplored. The aim of this study was to elucidate the regulating networks of dysregulated ncRNAs in Mitochondrial myopathy, Encephalopathy, Lactic Acidosis, and Stroke-like episodes (MELAS) with mitochondrial DNA (mtDNA) A3243G mutation, which might make contributions to the unveiling of the complex mechanisms underlying mitochondrial myopathy and, possibly, new tools applicable to clinical practice...
January 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28121618/leptin-and-adiponectin-pathophysiological-role-and-possible-therapeutic-target-of-inflammation-in-ischemic-stroke
#15
Jitender Gairolla, Rupinder Kler, Manish Modi, Dheeraj Khurana
Stroke is a multifactorial disease contributing to significant noncommunicable disease burden in developing countries. Risk of stroke is largely a consequence of morbidities of diabetes, obesity, hypertension, and heart diseases. Incidence of stroke is directly proportional to body mass index. Adipose tissue stores energy as well as acts as an active endocrine organ, which secretes numerous humoral factors. Adiponectin and leptin are the commonest adipocytokines and have been invariably linked to the development of coronary heart disease and may be involved in the underlying biological mechanism of stroke...
January 25, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/28118782/initial-experience-with-xenograft-bioconduit-for-the-treatment-of-complex-prosthetic-valve-endocarditis
#16
Apostolos Roubelakis, Dimos Karangelis, Syed Sadeque, Bobby Yanagawa, Amit Modi, Clifford W Barlow, Steven A Livesey, Sunil K Ohri
INTRODUCTION: The treatment of complex prosthetic valve endocarditis (PVE) with aortic root abscess remains a surgical challenge. Several studies support the use of biological tissues to minimize the risk of recurrent infection. We present our initial surgical experience with the use of an aortic xenograft conduit for aortic valve and root replacement. METHODS: Between October 2013 and August 2015, 15 xenograft bioconduits were implanted for complex PVE with abscess (13...
January 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28107809/plasma-protein-profiling-for-potential-biomarkers-in-the-early-diagnosis-of-alzheimer-s-disease
#17
Yuki Kitamura, Ryoko Usami, Sahoko Ichihara, Hirotaka Kida, Masayuki Satoh, Hidekazu Tomimoto, Mariko Murata, Shinji Oikawa
OBJECTIVES: Alzheimer's disease (AD) is the most common cause of dementia in elderly persons. Since the pathology of AD develops slowly from a preclinical or early phase into a fully expressed clinical syndrome, at the time of diagnosis the disease has been progressing for many years. To facilitate the early diagnosis of AD, we performed protein profiling of blood in patients with mild AD as defined by the Functional Assessment Staging (FAST) scale. METHODS: Plasma samples from mild AD patients and healthy controls were analyzed using two-dimensional differential gel electrophoresis (2D-DIGE) combined with matrix-assisted laser desorption ionization time-of-flight tandem mass spectrometry (MALDI-TOF/TOF/MS) followed by peptide mass fingerprinting...
March 2017: Neurological Research
https://www.readbyqxmd.com/read/28096400/defining-recovery-neurobiology-of-injured-spinal-cord-by-synthetic-matrix-assisted-hmsc-implantation
#18
Alexander E Ropper, Devang K Thakor, InBo Han, Dou Yu, Xiang Zeng, Jamie E Anderson, Zaid Aljuboori, Soo-Woo Kim, Hongjun Wang, Richard L Sidman, Ross D Zafonte, Yang D Teng
Mesenchymal stromal stem cells (MSCs) isolated from adult tissues offer tangible potential for regenerative medicine, given their feasibility for autologous transplantation. MSC research shows encouraging results in experimental stroke, amyotrophic lateral sclerosis, and neurotrauma models. However, further translational progress has been hampered by poor MSC graft survival, jeopardizing cellular and molecular bases for neural repair in vivo. We have devised an adult human bone marrow MSC (hMSC) delivery formula by investigating molecular events involving hMSCs incorporated in a uniquely designed poly(lactic-co-glycolic) acid scaffold, a clinically safe polymer, following inflammatory exposures in a dorsal root ganglion organotypic coculture system...
January 31, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28089985/giant-cell-arteritis-related-stroke-a-retrospective-multicenter-case-control-study
#19
Hubert de Boysson, Eric Liozon, Delphine Larivière, Maxime Samson, Jean-Jacques Parienti, Jonathan Boutemy, Gwénola Maigné, Nicolas Martin Silva, Kim Ly, Emmanuel Touzé, Bernard Bonnotte, Achille Aouba, Karim Sacré, Boris Bienvenu
OBJECTIVE: Our aim was to describe patients with giant cell arteritis (GCA)-related stroke and to compare them with a control group of GCA patients without stroke. METHODS: We created a retrospective multicenter cohort of patients with (1) GCA diagnosed according to the American College of Rheumatology criteria between 1995 and 2015, and (2) stroke occurring at the time of GCA diagnosis or occurring within 4 weeks of starting GCA therapy. The control group consisted of GCA patients without stroke...
January 15, 2017: Journal of Rheumatology
https://www.readbyqxmd.com/read/28088914/diverse-functions-and-mechanisms-of-pericytes-in-ischemic-stroke
#20
Shuai Yang, Huijuan Jin, Yiyi Zhu, Yan Wan, Lingqiang Zhu, Bo Hu
Pericytes are mural cells embedded in the basement membrane of microvessels. Because of such a unique position in the blood-brain barrier (BBB) and neurovascular unit (NVU), they receive, orchestrate and process signals from their neighboring cells to generate diverse neurovascular functions, including regulation of capillary hemodynamics, BBB permeability, clearance of toxic metabolites, angiogenesis, neuroinflammation and stem cell activity. During the different stages of ischemic stroke, pericytes play different roles: 1) On the hyperacute phase of stroke, pericytes constriction and death may be a cause of the no-reflow phenomenon in brain capillaries; 2) During the acute phase, pericytes detach from microvessels and participate in inflammatory-immunological response, resulting in the BBB damage and brain edema...
January 12, 2017: Current Neuropharmacology
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