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Biology of stroke

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https://www.readbyqxmd.com/read/28813934/a-hybrid-brain-machine-interface-based-on-eeg-and-emg-activity-for-the-motor-rehabilitation-of-stroke-patients
#1
Andrea Sarasola-Sanz, Nerea Irastorza-Landa, Eduardo Lopez-Larraz, Carlos Bibian, Florian Helmhold, Doris Broetz, Niels Birbaumer, Ander Ramos-Murguialday
Including supplementary information from the brain or other body parts in the control of brain-machine interfaces (BMIs) has been recently proposed and investigated. Such enriched interfaces are referred to as hybrid BMIs (hBMIs) and have been proven to be more robust and accurate than regular BMIs for assistive and rehabilitative applications. Electromyographic (EMG) activity is one of the most widely utilized biosignals in hBMIs, as it provides a quite direct measurement of the motion intention of the user...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813789/simulating-the-impact-of-sensorimotor-deficits-on-reaching-performance
#2
Sean M Sketch, Cole S Simpson, Frederic Crevecoeur, Allison M Okamura
The healthy human nervous system accurately and robustly controls movements despite nonlinear dynamics, noise, and delays. After a stroke, motor ability frequently becomes impaired. To provide insight into the relative impact of specific sensorimotor deficits on motor performance, we modeled neural control of reaching with the human upper limb as a near-optimally feedback-controlled two-degree-of-freedom system with biologically based parameters. We added three sensorimotor impairments commonly associated with post-stroke hemiparesis - abnormal joint coupling, increased noise on internally modeled dynamics, and muscular weakness - and examined the impact on reaching performance...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28810574/tissue-kallikrein-protects-against-ischemic-stroke-by-suppressing-tlr4-nf-%C3%AE%C2%BAb-and-activating-nrf2-signaling-pathway-in-rats
#3
Jiawei Yang, Jianhua Su, Fen Wan, Nan Yang, Haibo Jiang, Mingming Fang, Hang Xiao, Jun Wang, Jinrong Tang
Brain damage following cerebral ischemia-reperfusion (I/R) is a complicated pathophysiological course, in which inflammation and oxidative stress have been suggested to serve an important role. Toll-like receptor 4 (TLR4) has been suggested to be involved in secondary inflammatory process in cerebral ischemia. Nuclear factor erythroid 2-related factor 2 (Nrf2), an important regulator of the antioxidant host defense, maintains the cellular redox homeostasis. Tissue kallikrein (TK) has been proven to elicit a variety of biological effects in ischemic stroke through its anti-inflammatory and anti-oxidant properties...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28809934/long-term-exposure-to-air-pollution-and-the-incidence-of-parkinson-s-disease-a-nested-case-control-study
#4
Chiu-Ying Chen, Hui-Jung Hung, Kuang-Hsi Chang, Chung Y Hsu, Chih-Hsin Muo, Chon-Haw Tsai, Trong-Neng Wu
BACKGROUND: Previous studies revealed that chronic exposure to air pollution can significantly increase the risk of the development of Parkinson's disease (PD), but this relationship is inconclusive as large-scale prospective studies are limited and the results are inconsistent. Therefore, the purpose of this study was to ascertain the adverse health effects of air pollution exposure in a nationwide population using a longitudinal approach. MATERIALS AND METHODS: We conducted a nested case-control study using the National Health Insurance Research Dataset (NHIRD), which consisted of 1,000,000 beneficiaries in the National Health Insurance Program (NHI) in the year 2000 and their medical records from 1995 to 2013 and using public data on air pollution concentrations from monitoring stations across Taiwan released from the Environmental Protection Administration to identify people with ages ≥ 40 years living in areas with monitoring stations during 1995-1999 as study subjects...
2017: PloS One
https://www.readbyqxmd.com/read/28805871/asymmetric-motion-of-magnetically-actuated-artificial-cilia
#5
Srinivas Hanasoge, Matthew Ballard, Peter J Hesketh, Alexander Alexeev
Most microorganisms use hair-like cilia with asymmetric beating to perform vital bio-physical processes. In this paper, we demonstrate a novel fabrication method for creating magnetic artificial cilia capable of such a biologically inspired asymmetric beating pattern essential for inducing microfluidic transport at low Reynolds number. The cilia are fabricated using a lithographic process in conjunction with deposition of magnetic nickel-iron permalloy to create flexible filaments that can be manipulated by varying an external magnetic field...
August 14, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28803534/moving-rehabilitation-research-forward-developing-consensus-statements-for-rehabilitation-and-recovery-research
#6
Julie Bernhardt, Karen Borschmann, Lara Boyd, S Thomas Carmichael, Dale Corbett, Steven C Cramer, Tammy Hoffmann, Gert Kwakkel, Sean Savitz, Gustavo Saposnik, Marion Walker, Nick Ward
Stroke recovery is the next frontier in stroke medicine. While growth in rehabilitation and recovery research is exponential, a number of barriers hamper our ability to rapidly progress the field. Standardized terminology is absent in both animal and human research, methods are poorly described, recovery biomarkers are not well defined, and we lack consistent timeframes or measures to examine outcomes. Agreed methods and conventions for developing, monitoring, evaluating and reporting interventions directed at improving recovery are lacking, and current approaches are often not underpinned by biology...
August 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28803530/enhancing-the-alignment-of-the-preclinical-and-clinical-stroke-recovery-research-pipeline-consensus-based-core-recommendations-from-the-stroke-recovery-and-rehabilitation-roundtable-translational-working-group
#7
Dale Corbett, S Thomas Carmichael, Timothy H Murphy, Theresa A Jones, Martin E Schwab, Jukka Jolkkonen, Andrew N Clarkson, Numa Dancause, Tadeusz Weiloch, Heidi Johansen-Berg, Michael Nilsson, Louise D McCullough, Mary T Joy
Stroke recovery research involves distinct biological and clinical targets compared to the study of acute stroke. Guidelines are proposed for the pre-clinical modeling of stroke recovery and for the alignment of pre-clinical studies to clinical trials in stroke recovery.
August 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28767407/circulating-long-chain-n-3-polyunsaturated-fatty-acid-and-incidence-of-stroke-a-meta-analysis-of-prospective-cohort-studies
#8
Bo Yang, Xiao-Li Ren, Hong Huang, Xiao-Juan Guo, Ai-Guo Ma, Duo Li
BACKGROUND: Circulating long-chain (LC) n-3 polyunsaturated fatty acid (PUFA) can provide objective measures that reflect both dietary consumption and relevant biological processes. Nevertheless, prospective cohort studies on circulating LC n-3 PUFA in relation to incidence of stroke have yielded inconsistent results. We therefore conducted a meta-analysis to quantitatively evaluate the association. RESULTS: A total of 2,836 stroke events occurred among 20,460 individuals aged 35-79 yr from 10 prospective cohort studies...
July 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28763512/a-glycan-based-approach-to-therapeutic-angiogenesis
#9
Jie Shi Chua, Vy M Tran, Mausam Kalita, Maritza V Quintero, Orlando Antelope, Geethu Muruganandam, Yukio Saijoh, Balagurunathan Kuberan
Angiogenesis, the sprouting of new blood vessels from existing vasculature, involves multiple complex biological processes, and it is an essential step for hemostasis, tissue healing and regeneration. Angiogenesis stimulants can ameliorate human disease conditions including limb ischemia, chronic wounds, heart disease, and stroke. The current strategies to improve the bioavailability of pro-angiogenic growth factors, including VEGF and FGF2, have remained largely unsuccessful. This study demonstrates that small molecules, termed click-xylosides, can promote angiogenesis in the in vitro matrigel tube formation assay and the ex ovo chick chorioallantoic membrane assay, depending on their aglycone moieties...
2017: PloS One
https://www.readbyqxmd.com/read/28760750/the-expressed-genome-in-cardiovascular-diseases-and-stroke-refinement-diagnosis-and-prediction-a-scientific-statement-from-the-american-heart-association
#10
REVIEW
Kiran Musunuru, Erik Ingelsson, Myriam Fornage, Peter Liu, Anne M Murphy, L Kristin Newby, Christopher Newton-Cheh, Marco V Perez, Deepak Voora, Daniel Woo
There have been major advances in our knowledge of the contribution of DNA sequence variations to cardiovascular disease and stroke. However, the inner workings of the body reflect the complex interplay of factors beyond the DNA sequence, including epigenetic modifications, RNA transcripts, proteins, and metabolites, which together can be considered the "expressed genome." The emergence of high-throughput technologies, including epigenomics, transcriptomics, proteomics, and metabolomics, is now making it possible to address the contributions of the expressed genome to cardiovascular disorders...
August 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28757054/late-dacron-patch-inflammatory-reaction-after-carotid-endarterectomy
#11
M Alawy, W Tawfick, M ElKassaby, A Shalaby, M Zaki, N Hynes, S Sultan
OBJECTIVE: The aim was to analyse the incidence and presentation of carotid patch inflammatory reactions following carotid endarterectomy (CEA). METHODS: This was a cohort study using a prospectively maintained database. All patients who underwent elective CEA at a tertiary vascular centre between 2002 and 2016 were included. Computed tomography scan angiogram, duplex scan, and leucocyte scintigraphy were used to assess patients with suspected inflammatory patch complications...
July 27, 2017: European Journal of Vascular and Endovascular Surgery
https://www.readbyqxmd.com/read/28748495/evidence-for-interactions-between-homocysteine-and-genistein-insights-into-stroke-risk-and-potential-treatment
#12
Zyta Banecka-Majkutewicz, Leszek Kadziński, Michał Grabowski, Sylwia Bloch, Rajmund Kaźmierkiewicz, Joanna Jakóbkiewicz-Banecka, Magdalena Gabig-Cimińska, Grzegorz Węgrzyn, Alicja Węgrzyn, Bogdan Banecki
Elevated plasma homocysteine (2-amino-4-sulfanylbutanoic acid) level is a risk factor for stroke. Moreover, it has been suggested that high levels of homocysteine in the acute phase of an ischemic stroke can predict mortality, especially in stroke patients with the large-vessel atherosclerosis subtype. In clinical studies, supplementation with genistein (5, 7-dihydroxy-3- (4-hydroxyphenyl)-4H-1-benzopyran-4-one) decreased plasma homocysteine levels considerably. Therefore, genistein could be considered as a potential drug for prevention and/or treatment of stroke...
July 26, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/28747517/a-soft-robotic-exosuit-improves-walking-in-patients-after-stroke
#13
Louis N Awad, Jaehyun Bae, Kathleen O'Donnell, Stefano M M De Rossi, Kathryn Hendron, Lizeth H Sloot, Pawel Kudzia, Stephen Allen, Kenneth G Holt, Terry D Ellis, Conor J Walsh
Stroke-induced hemiparetic gait is characteristically slow and metabolically expensive. Passive assistive devices such as ankle-foot orthoses are often prescribed to increase function and independence after stroke; however, walking remains highly impaired despite-and perhaps because of-their use. We sought to determine whether a soft wearable robot (exosuit) designed to supplement the paretic limb's residual ability to generate both forward propulsion and ground clearance could facilitate more normal walking after stroke...
July 26, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28742189/novel-endogenous-negative-modulators-of-platelet-function-as-potential-anti-thrombotic-targets
#14
Y-J Li, H-X Zhu, D Zhang, H-C Li, P Ma, L-Y Huang
Platelets are megakaryocyte-derived nuclear-free fragments that participate in cardiovascular diseases including acute myocardial infarction, ischemic stroke, hypertension, and atherosclerosis. At the endothelium damage site, platelets interact with sub-endothelial matrix proteins such as glycoprotein VI/Fc receptor γ-chain (GPVI/FcRγ), G protein-coupled receptor/phospholipase Cγ(β) (GPCR/PLCγ(β)), Rho/RhoK and integrin. The activation of these signaling pathways triggers intracellular calcium increase and causes platelet adhesion, aggregation, granule release and finally thrombus formation...
July 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28733904/polyamines-therapeutic-perspectives-in-oxidative-stress-and-inflammatory-diseases
#15
REVIEW
Tarique Hussain, Bie Tan, Wenkai Ren, Najma Rahu, Rahim Dad, Dildar Hussain Kalhoro, Yulong Yin
Polyamines are naturally occurring aliphatic compounds, particularly essential elements for biological functions. These compounds play a central role in regulating molecular pathways which are responsible for cellular proliferation, growth, and differentiation. Importantly, excessive polyamine catabolism can lead to a prominent source of oxidative stress which increases inflammatory response and thought to be involved in several diseases including stroke, renal failure, neurological disease, liver disease, and even cancer...
July 21, 2017: Amino Acids
https://www.readbyqxmd.com/read/28733340/biological-age-is-better-than-chronological-as-predictor-of-3-month-outcome-in-ischemic-stroke
#16
Carolina Soriano-Tárraga, Marina Mola-Caminal, Eva Giralt-Steinhauer, Angel Ois, Ana Rodríguez-Campello, Elisa Cuadrado-Godia, Alejandra Gómez-González, Rosa M Vivanco-Hidalgo, Israel Fernández-Cadenas, Natalia Cullell, Jaume Roquer, Jordi Jiménez-Conde
OBJECTIVE: To analyze the effect of age-related DNA methylation changes in multiple cytosine-phosphate-guanine (CpG) sites (biological age [b-age]) on patient outcomes at 3 months after an ischemic stroke. METHODS: We included 511 patients with first-ever acute ischemic stroke assessed at Hospital del Mar (Barcelona, Spain) as the discovery cohort. Demographic and clinical data, including chronological age (c-age), vascular risk factors, initial stroke severity, recanalization treatment, and previous and 3-month modified Rankin Scale (p-mRS and 3-mRS, respectively) were registered...
July 21, 2017: Neurology
https://www.readbyqxmd.com/read/28732515/sexually-divergent-induction-of-microglial-associated-neuroinflammation-with-hippocampal-aging
#17
Colleen A Mangold, Benjamin Wronowski, Mei Du, Dustin R Masser, Niran Hadad, Georgina V Bixler, Robert M Brucklacher, Matthew M Ford, William E Sonntag, Willard M Freeman
BACKGROUND: The necessity of including both males and females in molecular neuroscience research is now well understood. However, there is relatively limited basic biological data on brain sex differences across the lifespan despite the differences in age-related neurological dysfunction and disease between males and females. METHODS: Whole genome gene expression of young (3 months), adult (12 months), and old (24 months) male and female C57BL6 mice hippocampus was analyzed...
July 21, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28728350/the-association-between-smoking-or-passive-smoking-and-cardiovascular-diseases-using-a-bayesian-hierarchical-model-based-on-the-2008-2013-korea-community-health-survey
#18
WhanHee Lee, SungHee Hwang, HaYoung Choi, Ho Kim
Objectives: Smoking and passive smoking have been extensively reported as risk factors of cardiovascular morbidity and mortality. Despite the biological mechanisms underlying the impact of hazardous chemical substances contained in tobacco in cardiovascular diseases, studies investigating the association between smoking and passive smoking with morbidity are at an inchoate stage in Korea. Therefore, this study aimed to estimate the risks of smoking and passive smoking on cardiovascular morbidity at the national and regional levels...
June 22, 2017: Epidemiology and Health
https://www.readbyqxmd.com/read/28726978/analysis-of-the-substrate-specificity-of-factor-vii-activating-protease-fsap-and-design-of-specific-and-sensitive-peptide-substrates
#19
Emrah Kara, Dipankar Manna, Geir Åge Løset, Eric L Schneider, Charles S Craik, Sandip Kanse
Factor VII (FVII) activating protease (FSAP) is a circulating serine protease that is likely to be involved in a number of disease conditions such as stroke, atherosclerosis, liver fibrosis, thrombosis and cancer. To date, no systematic information is available about the substrate specificity of FSAP. Applying phage display and positional scanning substrate combinatorial library (PS-SCL) approaches we have characterised the specificity of FSAP towards small peptides. Results were evaluated in the context of known protein substrates as well as molecular modelling of the peptides in the active site of FSAP...
July 20, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28721832/biomarkers-associated-with-bleeding-risk-in-the-setting-of-atrial-fibrillation
#20
Skevos Sideris, Stefanos Archontakis, George Latsios, George Lazaros, Konstantinos Toutouzas, Eleftherios Tsiamis, Manolis Vavuranakis, Charalampos Vlachopoulos, Konstantinos Gatzoulis, Konstantinos Tsioufis, Dimitris Tousoulis
Background Prevention of thromboembolic disease, mainly stroke, with oral anticoagulants remains a major therapeutic goal in patients with atrial fibrillation. Unfortunately, despite the high efficacy, anticoagulant therapy is associated with a significant risk of, frequently catastrophic, hemorrhagic complications. Among different clinical and laboratory parameters related to an increased risk of bleeding, several biological markers have been recognized and various risk scores for bleeding have been developed...
July 18, 2017: Current Medicinal Chemistry
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