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Biology of stroke

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https://www.readbyqxmd.com/read/28635653/virtual-screening-against-phosphoglycerate-kinase-1-in-quest-of-novel-apoptosis-inhibitors
#1
Jie Xia, Bo Feng, Qianhang Shao, Yuhe Yuan, Xiang Simon Wang, Naihong Chen, Song Wu
Inhibition of apoptosis is a potential therapy to treat human diseases such as neurodegenerative disorders (e.g., Parkinson's disease), stroke, and sepsis. Due to the lack of druggable targets, it remains a major challenge to discover apoptosis inhibitors. The recent repositioning of a marketed drug (i.e., terazosin) as an anti-apoptotic agent uncovered a novel target (i.e., human phosphoglycerate kinase 1 (hPgk1)). In this study, we developed a virtual screening (VS) pipeline based on the X-ray structure of Pgk1/terazosin complex and applied it to a screening campaign for potential anti-apoptotic agents...
June 21, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28628592/genetic-variation-and-neuroplasticity-role-in-rehabilitation-after-stroke
#2
Jill Campbell Stewart, Steven C Cramer
BACKGROUND AND PURPOSE: In many neurologic diagnoses, significant interindividual variability exists in the outcomes of rehabilitation. One factor that may impact response to rehabilitation interventions is genetic variation. Genetic variation refers to the presence of differences in the DNA sequence among individuals in a population. Genetic polymorphisms are variations that occur relatively commonly and, while not disease-causing, can impact the function of biological systems. The purpose of this article is to describe genetic polymorphisms that may impact neuroplasticity, motor learning, and recovery after stroke...
July 2017: Journal of Neurologic Physical Therapy: JNPT
https://www.readbyqxmd.com/read/28627961/microsomal-prostaglandin-e2-synthase-1-inhibitors-a-patent-review
#3
Anastasia Psarra, Aikaterini Nikolaou, Maroula G Kokotou, Dimitris Limnios, George Kokotos
Microsomal prostaglandin E2 synthase-1 (mPGES-1) catalyzes the terminal step of prostaglandin E2 (PGE2) generation. It is strongly upregulated in inflamed tissues and overexpressed in tumors and it has been recognized as a key enzyme in inflammatory diseases such as arthritis, atherosclerosis, stroke and cancer. Thus, a great effort has been devoted in developing synthetic mPGES-1 inhibitors as novel anti-inflammatory agents. Areas covered: This review article summarizes the mPGES-1 inhibitors presented in patent literature from 2000 to August 2016 and their biological evaluation, discussing their activities in vitro and in vivo...
June 19, 2017: Expert Opinion on Therapeutic Patents
https://www.readbyqxmd.com/read/28625785/cerebral-ischemia-repefusion-injury-from-bench-space-to-bedside
#4
REVIEW
Z Nagy, S Nardai
While stroke research represents the primary interface between circulation and brain research, the hemostasis system also carries a pivotal role in the mechanism of vascular brain injury. The complex interrelated events triggered by the energy crisis have a specific spatial and temporal pattern arching from the initial damage to the final events of brain repair. The complexity of the pathophysiology make it difficult to model this disease, therefore it is challenging to find appropriate therapeutic targets...
June 15, 2017: Brain Research Bulletin
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/28615939/effect-of-carbon-ion-implantation-on-the-tribology-of-metal-on-metal-bearings-for-artificial-joints
#6
Hironobu Koseki, Masato Tomita, Akihiko Yonekura, Takashi Higuchi, Sinya Sunagawa, Koumei Baba, Makoto Osaki
Metal-on-metal (MoM) bearings have become popular due to a major advantage over metal-on-polymer bearings for total hip arthroplasty in that the larger femoral head and hydrodynamic lubrication of the former reduce the rate of wear. However, concerns remain regarding adverse reactions to metal debris including metallosis caused by metal wear generated at the taper-head interface and another modular junction. Our group has hypothesized that carbon ion implantation (CII) may improve metal wear properties. The purpose of this study was to investigate the wear properties and friction coefficients of CII surfaces with an aim to ultimately apply these surfaces to MoM bearings in artificial joints...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28614417/antipsychotic-medications-and-stroke-in-schizophrenia-a-case-crossover-study
#7
Wen-Yin Chen, Lian-Yu Chen, Hsing-Cheng Liu, Chi-Shin Wu, Shu-Yu Yang, Chun-Hung Pan, Shang-Ying Tsai, Chiao-Chicy Chen, Chian-Jue Kuo
BACKGROUND: The association between antipsychotic use and the risk of stroke in schizophrenic patients is controversial. We sought to study the association in a nationwide cohort with schizophrenia. METHODS: Using a retrospective cohort of patients with schizophrenia (N = 31,976) derived from the Taiwan National Health Insurance Research Database, 802 new-onset cases of stroke were identified within 10 years of follow-up (from 2000 through 2010). We designed a case-crossover study using 14-day windows to explore the risk factors of stroke and the association between antipsychotic drugs and the risk of stroke...
2017: PloS One
https://www.readbyqxmd.com/read/28608165/platelet-related-biomarkers-and-their-response-to-inhibition-with-aspirin-and-p2y12-receptor-antagonists-in-patients-with-acute-coronary-syndrome
#8
Angela Lowenstern, Robert F Storey, Megan Neely, Jie-Lena Sun, Dominick J Angiolillo, Christopher P Cannon, Anders Himmelmann, Kurt Huber, Stefan K James, Hugo A Katus, Joao Morais, Agneta Siegbahn, Phillippe Gabriel Steg, Lars Wallentin, Richard C Becker
The PLATelet inhibition and patient Outcomes (PLATO) trial showed that treatment with ticagrelor reduced the rate of death due to vascular causes, myocardial infarction and stroke when compared to clopidogrel in patients with ST-elevation or non-ST-elevation acute coronary syndrome (ACS). While the comparative benefit of ticagrelor over clopidogrel increased over time, event rates accrued in both groups during the study period. The purpose of our biomarker-based exploratory analysis was to determine whether long-term platelet inhibition may be associated with platelet adaptation...
June 12, 2017: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/28601054/association-of-serum-levels-of-pentraxin-3-m-ficolin-and-surfactant-protein-a-with-the-severity-of-ischemic-stroke
#9
Ebrahim Kouchaki, Atousa Babamohammadi, Hassan Nikoueinejad, Mojtaba Sehat
Stroke is one of the most leading causes of death and disability in the world. Complement system activation contributes to pathogenesis and neuronal damage following stroke. There are no defined biological serum markers to determine the severity of stroke in acute phases. The purpose of current study was to determine the association of three complement activators, namely Pentraxin-3 (PTX3),M-ficolin, and Surfactant protein A (SPA) with the severity of ischemic stroke. This cross-sectional study was done on 82 patients diagnosed with ischemic stroke at 24-96 hours of initiation of the clinical symptoms during 2014-2015...
April 2017: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/28596509/serum-galectin-3-level-not-galectin-1-is-associated-with-the-clinical-feature-and-outcome-in-patients-with-acute-ischemic-stroke
#10
Han Dong, Zhi-Hao Wang, Na Zhang, Si-Da Liu, Jian-Jun Zhao, Song-Yan Liu
AIM: To study the diagnostic and prognostic role of serum galectin-1 (Gal-1) and -3 (Gal-3) in acute ischemic stroke (AIS) patients. METHODS: We enrolled 233 patients with first-ever acute ischemic stroke and 252 healthy controls in this study. The AIS severity was evaluated by National Institutes of Health Stroke Scale (NIHSS) scores. The serum Gal-1 and -3 levels were determined. All patients were followed for 1 years and the functional outcome were evaluated by modified Rankin Scale (mRS) scores...
May 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28590584/free-water-and-free-water-corrected-fractional-anisotropy-in-primary-and-premotor-corticospinal-tracts-in-chronic-stroke
#11
Derek B Archer, Carolynn Patten, Stephen A Coombes
Measures from diffusion MRI have been used to characterize the corticospinal tract in chronic stroke. However, diffusivity can be influenced by partial volume effects from free-water, region of interest placement, and lesion masking. We collected diffusion MRI from a cohort of chronic stroke patients and controls and used a bitensor model to calculate free-water corrected fractional anisotropy (FAT ) and free water (FW) in the primary motor corticospinal tract (M1-CST) and the dorsal premotor corticospinal tract (PMd-CST)...
June 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28588054/sustained-neurological-recovery-after-stroke-in-aged-rats-treated-with-a-novel-prostacyclin-analog
#12
Changjun Yang, Kelly M DeMars, Jon C Alexander, Marcelo Febo, Eduardo Candelario-Jalil
BACKGROUND AND PURPOSE: Targeting the prostaglandin I2 prostanoid (IP) receptor to reduce stroke injury has been hindered by the lack of selective drugs. MRE-269 is the active metabolite of selexipag showing a high selectivity toward the IP receptor. Selexipag has been recently approved for clinical use in pulmonary hypertension. We hypothesized that postischemic treatment with MRE-269 provides long-lasting neuroprotection with improved neurological outcomes in a clinically relevant rat stroke model...
June 6, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28583999/paramedic-initiation-of-neuroprotective-agent-infusions-successful-achievement-of-target-blood-levels-and-attained-level-effect-on-clinical-outcomes-in-the-fast-mag-pivotal-trial-field-administration-of-stroke-therapy-magnesium
#13
Kristina Shkirkova, Sidney Starkman, Nerses Sanossian, Marc Eckstein, Samuel Stratton, Frank Pratt, Robin Conwit, Scott Hamilton, Latisha Sharma, David Liebeskind, Lucas Restrepo, Miguel Valdes-Sueiras, Jeffrey L Saver
BACKGROUND AND PURPOSE: Paramedic use of fixed-size lumen, gravity-controlled tubing to initiate intravenous infusions in the field may allow rapid start of neuroprotective therapy for acute stroke. In a large, multicenter trial, we evaluated its efficacy in attaining target serum levels of candidate neuroprotective agent magnesium sulfate and the relation of achieved magnesium levels to outcome. METHODS: The FAST-MAG phase 3 trial (Field Administration of Stroke Therapy - Magnesium) randomized 1700 patients within 2 hours of onset to paramedic-initiated, a 15-minute loading intravenous infusion of magnesium or placebo followed by a 24-hour maintenance dose...
June 5, 2017: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/28576652/platelet-function-testing-in-patients-with-acute-ischemic-stroke-an-observational-study
#14
Francesca Rosafio, Nicoletta Lelli, Stefano Mimmi, Laura Vandelli, Guido Bigliardi, Maria Luisa Dell'Acqua, Livio Picchetto, Roberta Pentore, Diana Ferraro, Tommaso Trenti, Paolo Nichelli, Andrea Zini
BACKGROUND: The measurement of platelet reactivity in patients with stroke undergoing antiplatelet therapies is not commonly performed in clinical practice. We assessed the prevalence of therapy responsiveness in patients with stroke and further investigated differences between patients on prevention therapy at stroke onset and patients naive to antiplatelet medications. We also sought differences in responsiveness between etiological subtypes and correlations between Clopidogrel responsiveness and genetic polymorphisms...
May 30, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28566501/prevention-of-contrast-induced-nephropathy-by-limb-ischemic-preconditioning-underlying-mechanisms-and-clinical-effects
#15
George Dugbartey, Andrew N Redington
Contrast-induced nephropathy (CIN) is an important complication following diagnostic radiographic imaging and interventional therapy. It results from administration of intravascular iodinated contrast media (CM) and is currently the third most common cause of hospital-acquired acute kidney injury. CIN is associated with increased morbidity, prolonged hospitalization and higher mortality. Although the importance of CIN is widely appreciated, and its occurrence can be mitigated by the use of pre- and post-hydration protocols and low osmolar instead of high osmolar iodine-containing CM, specific prophylactic therapy is lacking...
May 31, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28565759/oral-administration-of-ampelopsin-protects-against-acute-brain-injury-in-rats-following-focal-cerebral-ischemia
#16
Xiao-Li Ye, Ling-Qun Lu, Wei Li, Qi Lou, Hong-Gang Guo, Qiao-Juan Shi
Ampelopsin (AMP) is isolated from the Chinese medicinal herb Ampelopsis grossedentata (Hand-Mazz) and has been associated with numerous biological and pharmacological activities. However, it is not clear whether AMP has a direct protective effect on cerebral ischemia reperfusion injury. Therefore, the present study investigated its role in acute brain injury following focal cerebral ischemia in rats. The current study induced transient focal cerebral ischemia by performing middle cerebral artery occlusion (MCAO) for 60 min, followed by 24 h of reperfusion...
May 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28550144/exacerbation-of-oxygen-glucose-deprivation-induced-blood-brain-barrier-disruption-potential-pathogenic-role-of-interleukin-9-in-ischemic-stroke
#17
Sha Tan, Yilong Shan, Yuge Wang, Yinyao Lin, Siyuan Liao, Zhezhi Deng, Li Zhou, Wei Cai, Qin Zeng, Lei Zhang, Bingjun Zhang, Xuejiao Men, Haiyan Li, Xueqiang Hu, Changyou Wu, Lisheng Peng, Zhengqi Lu
Interleukin (IL) -9 exerts a variety of functions in autoimmune diseases. However, its role in ischemic brain injury remains unknown. The present study explored the biological effects of IL-9 in ischemic stroke. We recruited 42 patients newly diagnosed with ischemic stroke and 22 age- and sex-matched healthy controls. The expression levels of IL-9 and percentages of IL-9-producing T cells, including CD3+CD4+IL-9+ and CD3+CD8+IL-9+ cells, were determined in peripheral blood mononuclear cells (PBMCs) obtained from patients and control individuals...
May 26, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28545344/identification-of-the-components-associated-with-functioning-using-the-international-classification-of-functioning-disability-and-health-comprehensive-core-set-for-stroke-in-indian-stroke-survivors
#18
Shankar Ganesh, Sidhanjana Mohapatra, Patitapaban Mohanty, Monalisa Pattnaik, Chittaranjan Mishra
OBJECTIVES: Rehabilitation interventions are expected to ensure best possible recovery and minimize functional disability in stroke survivors. However, not many studies have investigated patterns of recovery and outcomes after stroke in low-income countries. The objective of this study is to identify the biological, psychological, and social components associated with functioning over time in Indian stroke patients using the International Classification of Functioning, Disability and Health (ICF)-based tools and the Functional Independence Measure (FIM)...
May 25, 2017: Topics in Stroke Rehabilitation
https://www.readbyqxmd.com/read/28541444/blood-brain-barrier-pericyte-importance-in-malignant-gliomas-what-we-can-learn-from-stroke-and-alzheimer-s-disease
#19
Sadhana Jackson, Ayman ElAli, Daniela Virgintino, Mark R Gilbert
The pericyte, a constitutive component of the central nervous system, is a poorly understood cell type that envelops the endothelial cell with the intended purpose of regulating vascular flow and endothelial cell permeability. Previous studies of pericyte function have been limited to a small number of disease processes such as ischemic stroke and Alzheimer's disease. Recently, publications have postulated a link between glioma stem cell differentiation and pericyte function. These studies suggest that there may be an important interaction of pericytes with tumor cells and other components of the tumor microenvironment in malignant primary glial neoplasms, most notably glioblastoma...
May 24, 2017: Neuro-oncology
https://www.readbyqxmd.com/read/28537507/electroacupuncture-alleviated-brain-damages-through-mir-191a-5p-targeting-neuronal-calcium-sensor-1-after-ischemic-stroke
#20
Heng Zhou, Ceng Yang, Fuhai Bai, Zhi Ma, Jingyi Wang, Feng Wang, Feng Li, Qiang Wang, Lize Xiong
Electroacupuncture (EA) administration before or after cerebral ischemia has been shown to afford protection against ischemic injury. However, the underlying mechanism of EA-mediated protection is still unclear. Functional microRNAs (miRNAs) are believed to play important roles in neuroprotection and synaptic plasticity during and after ischemia. In a previous study, we identified 20 miRNAs that are expressed in the penumbra and are significantly changed after EA treatment. Here, we used bioinformatics analysis to predict the biological functions and gene-networks of these miRNAs...
May 24, 2017: Rejuvenation Research
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