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Biology of stroke

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https://www.readbyqxmd.com/read/28327374/discovery-and-molecular-interaction-studies-of-a-highly-stable-tarantula-peptide-modulator-of-acid-sensing-ion-channel-1
#1
REVIEW
Sing Yan Er, Ben Cristofori-Armstrong, Pierre Escoubas, Lachlan D Rash
Acute pharmacological inhibition of acid-sensing ion channel 1a (ASIC1a) is efficacious in rodent models in alleviating symptoms of neurological diseases such as stroke and multiple sclerosis. Thus, ASIC1a is a promising therapeutic target and selective ligands that modulate it are invaluable research tools and potential therapeutic leads. Spider venoms have provided an abundance of voltage-gated ion channel modulators, however, only one ASIC modulator (PcTx1) has so far been isolated from this source. Here we report the discovery, characterization, and chemical stability of a second spider venom peptide that potently modulates ASIC1a and ASIC1b, and investigate the molecular basis for its subtype selectivity...
March 18, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28322973/imidazoline-i2-receptors-an-update
#2
REVIEW
Jun-Xu Li
Since first introduced more than two decades ago, the research in imidazoline I2 receptors has been steadily increasing. This review provides an update on the current status of I2 receptor pharmacology. Imidazoline I2 receptors or I2 binding sites refer to several (at least four) different proteins that bind to [(3)H]-idazoxan and [(3)H]-2-BFI with high affinity. The molecular identities of the proteins remain elusive. One of the proteins (45 kD) seems to be consistent with the identity of brain creatine kinase...
March 16, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28322920/stem-cell-transplantation-therapy-for-multifaceted-therapeutic-benefits-after-stroke
#3
REVIEW
Ling Wei, Zheng Z Wei, Michael Qize Jiang, Osama Mohamad, Shan Ping Yu
One of the exciting advances in modern medicine and life science is cell-based neurovascular regeneration of damaged brain tissues and repair of neuronal structures. The progress in stem cell biology and creation of adult induced pluripotent stem (iPS) cells has significantly improved basic and pre-clinical research in disease mechanisms and generated enthusiasm for potential applications in the treatment of central nervous system (CNS) diseases including stroke. Endogenous neural stem cells and cultured stem cells are capable of self-renewal and give rise to virtually all types of cells essential for the makeup of neuronal structures...
March 16, 2017: Progress in Neurobiology
https://www.readbyqxmd.com/read/28322170/utilizing-delta-opioid-receptors-and-peptides-for-cytoprotection-implications-in-stroke-and-other-neurological-disorders
#4
Marci G Crowley, M Grant Liska, Trenton Lippert, Sydney Coreya, Cesar V Borlongan
The opioid system has been elucidated as a potential target for therapy in a variety of neurological disorders including stroke. Delta opioid receptors have been revealed to pose an especially compelling biological function for new neuroprotective therapies. Two distinct therapeutic mechanisms have been characterized for delta opioid receptors s, namely, these receptors aid in maintaining ionic homeostasis and initiate endogenous neuroprotective pathways. Specific agonists of delta opioid receptors, such as (D-Ala2, D-Leu5) enkephalin (DADLE), have displayed the ability to promote neuronal survival and mitigate apoptotic pathways...
March 20, 2017: CNS & Neurological Disorders Drug Targets
https://www.readbyqxmd.com/read/28322105/clinical-features-and-biological-markers-of-lung-cancer-associated-stroke
#5
Xingrui Xie, Li Chen, Jinsheng Zeng, Chao Qin, Daobin Cheng, Xinxian Wei, Zhijian Liang
Objective To identify the unique clinical features and biological markers of lung cancer-associated stroke. Methods We recruited 102 patients with lung cancer plus stroke, 102 with lung cancer, and 102 with stroke. Detailed information was analysed and compared among groups. Results The groups were age-matched. Patients with lung cancer plus stroke showed multiple lesions involving multiple cerebral artery territories on magnetic resonance imaging, compared with stroke-alone patients. These patients also had a poorer modified Rankin Scale score at 30 days, and high mortality (18...
December 2016: Journal of International Medical Research
https://www.readbyqxmd.com/read/28320757/additional-candidate-genes-for-human-atherosclerotic-disease-identified-through-annotation-based-on-chromatin-organization
#6
Saskia Haitjema, Claartje A Meddens, Sander W van der Laan, Daniel Kofink, Magdalena Harakalova, Vinicius Tragante, Hassan Foroughi Asl, Jessica van Setten, Maarten M Brandt, Joshua C Bis, Christopher O'Donnell, Caroline Cheng, Imo E Hoefer, Johannes Waltenberger, Erik Biessen, J Wouter Jukema, Pieter A F M Doevendans, Edward E S Nieuwenhuis, Jeanette Erdmann, Johan L M Björkegren, Gerard Pasterkamp, Folkert W Asselbergs, Hester M den Ruijter, Michal Mokry
BACKGROUND: As genome-wide association efforts, such as CARDIoGRAM and METASTROKE, are ongoing to reveal susceptibility loci for their underlying disease-atherosclerotic disease-identification of candidate genes explaining the associations of these loci has proven the main challenge. Many disease susceptibility loci colocalize with DNA regulatory elements, which influence gene expression through chromatin interactions. Therefore, the target genes of these regulatory elements can be considered candidate genes...
April 2017: Circulation. Cardiovascular Genetics
https://www.readbyqxmd.com/read/28317479/climate-changes-and-human-health-a-review-of-the-effect-of-environmental-stressors-on-cardiovascular-diseases-across-epidemiology-and-biological-mechanisms
#7
Paolo Giorgini, Paolo Di Giosia, Marco Petrarca, Francesco Lattanzio, Cosimo Andrea Stamerra, Claudio Ferri
BACKGROUND: Climate change is rapidly affecting all the regions of our planet. The most relevant example is global warming, which impacts on the earth's ecosystems, threatening human health. Other effects include extreme variations in temperature and increases in air pollution. These events may negatively impact mortality and morbidity for cardiovascular diseases. METHODS: In this review, we discuss the main effects of climate changes on cardiovascular diseases, reporting the epidemiological evidences and the biological mechanisms linking climate change consequences to hypertension, diabetes, ischemic heart diseases, heart failure and stroke...
March 17, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28303914/restoring-brain-function-after-stroke-bridging-the-gap-between-animals-and-humans
#8
REVIEW
Nick S Ward
Stroke is the leading cause of complex adult disability in the world. Recovery from stroke is often incomplete, which leaves many people dependent on others for their care. The improvement of long-term outcomes should, therefore, be a clinical and research priority. As a result of advances in our understanding of the biological mechanisms involved in recovery and repair after stroke, therapeutic opportunities to promote recovery through manipulation of poststroke plasticity have never been greater. This work has almost exclusively been carried out in preclinical animal models of stroke with little translation into human studies...
March 17, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28300134/white-matter-repair-after-extracellular-vesicles-administration-in-an-experimental-animal-model-of-subcortical-stroke
#9
Laura Otero-Ortega, Fernando Laso-García, María Del Carmen Gómez-de Frutos, Berta Rodríguez-Frutos, Jorge Pascual-Guerra, Blanca Fuentes, Exuperio Díez-Tejedor, María Gutiérrez-Fernández
Mesenchymal stem cells have previously been shown to mediate brain repair after stroke; they secrete 50-100 nm complexes called extracellular vesicles (EVs), which could be responsible for provoking neurovascular repair and functional recovery. EVs have been observed by electron microscopy and NanoSight, and they contain associated proteins such as CD81 and Alix. This purified, homogeneous population of EVs was administered intravenously after subcortical stroke in rats. To evaluate the EVs effects, we studied the biodistribution, proteomics analysis, functional evaluation, lesion size, fiber tract integrity, axonal sprouting and white matter repair markers...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28298467/swimming-and-diving-energetics-in-dolphins-a-stroke-by-stroke-analysis-for-predicting-the-cost-of-flight-responses-in-wild-odontocetes
#10
Terrie M Williams, Traci L Kendall, Beau P Richter, Courtney R Ribeiro-French, Jason S John, Kim L Odell, Barbara A Losch, David A Feuerbach, M Andrew Stamper
Exponential increases in hydrodynamic drag and physical exertion occur when swimmers move quickly through water, and underlie the preference for relatively slow routine speeds by marine mammals regardless of body size. Because of this and the need to balance limited oxygen stores when submerged, flight (escape) responses may be especially challenging for this group. To examine this, we used open-flow respirometry to measure the energetic cost of producing a swimming stroke during different levels of exercise in bottlenose dolphins (Tursiops truncatus)...
March 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28292859/-18-f-fluoride-and-18-f-fluorodeoxyglucose-positron-emission-tomography-after-transient-ischemic-attack-or-minor-ischemic-stroke-case-control-study
#11
Alex T Vesey, William S A Jenkins, Agnese Irkle, Alastair Moss, Greg Sng, Rachael O Forsythe, Tim Clark, Gemma Roberts, Alison Fletcher, Christophe Lucatelli, James H F Rudd, Anthony P Davenport, Nicholas L Mills, Rustam Al-Shahi Salman, Martin Dennis, William N Whiteley, Edwin J R van Beek, Marc R Dweck, David E Newby
BACKGROUND: Combined positron emission tomography (PET) and computed tomography (CT) can assess both anatomy and biology of carotid atherosclerosis. We sought to assess whether (18)F-fluoride or (18)F-fluorodeoxyglucose can identify culprit and high-risk carotid plaque. METHODS AND RESULTS: We performed (18)F-fluoride and (18)F-fluorodeoxyglucose PET/CT in 26 patients after recent transient ischemic attack or minor ischemic stroke: 18 patients with culprit carotid stenosis awaiting carotid endarterectomy and 8 controls without culprit carotid atheroma...
March 2017: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28289478/cerebral-white-matter-hyperintensities-on-mri-and-acceleration-of-epigenetic-aging-the-atherosclerosis-risk-in-communities-study
#12
Abhay Raina, Xiaoping Zhao, Megan L Grove, Jan Bressler, Rebecca F Gottesman, Weihua Guan, James S Pankow, Eric Boerwinkle, Thomas H Mosley, Myriam Fornage
BACKGROUND: Cerebral white matter hyperintensities (WMH) on magnetic resonance imaging (MRI) are part of the spectrum of brain vascular injury accompanying aging and are associated with a substantial risk of stroke and dementia. We investigated the association of cerebral WMH burden on MRI with a DNA methylation-based biomarker of aging, termed DNA methylation age acceleration, which represents the deviation of the DNA methylation-predicted age from the chronologic age. RESULTS: In this cross-sectional observational study of 713 African-American participants of the Atherosclerosis Risk in Communities study, aged 51-73 years, estimates of predicted age were obtained based on two algorithms (Hannum et al...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28266590/predictive-factors-of-intestinal-necrosis-in-acute-mesenteric-ischemia-prospective-study-from-an-intestinal-stroke-center
#13
Alexandre Nuzzo, Leon Maggiori, Maxime Ronot, Aymeric Becq, Aurelie Plessier, Nathalie Gault, Francisca Joly, Yves Castier, Valerie Vilgrain, Catherine Paugam, Yves Panis, Yoram Bouhnik, Dominique Cazals-Hatem, Olivier Corcos
OBJECTIVES: To identify predictive factors for irreversible transmural intestinal necrosis (ITIN) in acute mesenteric ischemia (AMI) and establish a risk score for ITIN. METHODS: This single-center prospective cohort study was performed between 2009 and 2015 in patients with AMI. The primary outcome was the occurrence of ITIN, confirmed by specimen analysis in patients who underwent surgery. Patients who recovered from AMI with no need for intestinal resection were considered not to have ITIN...
March 7, 2017: American Journal of Gastroenterology
https://www.readbyqxmd.com/read/28264095/association-between-migraine-and-cervical-artery-dissection-the-italian-project-on-stroke-in-young-adults
#14
Valeria De Giuli, Mario Grassi, Corrado Lodigiani, Rosalba Patella, Marialuisa Zedde, Carlo Gandolfo, Andrea Zini, Maria Luisa DeLodovici, Maurizio Paciaroni, Massimo Del Sette, Cristiano Azzini, Antonella Toriello, Rossella Musolino, Rocco Salvatore Calabrò, Paolo Bovi, Maria Sessa, Alessandro Adami, Giorgio Silvestrelli, Anna Cavallini, Simona Marcheselli, Domenico Marco Bonifati, Nicoletta Checcarelli, Lucia Tancredi, Alberto Chiti, Enrico Maria Lotti, Elisabetta Del Zotto, Giampaolo Tomelleri, Alessandra Spalloni, Elisa Giorli, Paolo Costa, Loris Poli, Andrea Morotti, Filomena Caria, Alessia Lanari, Giacomo Giacalone, Paola Ferrazzi, Alessia Giossi, Valeria Piras, Davide Massucco, Cataldo D'Amore, Filomena Di Lisi, Ilaria Casetta, Laura Cucurachi, Masina Cotroneo, Alessandro De Vito, Elisa Coloberti, Maurizia Rasura, Anna Maria Simone, Massimo Gamba, Paolo Cerrato, Giuseppe Micieli, Giovanni Malferrari, Maurizio Melis, Licia Iacoviello, Alessandro Padovani, Alessandro Pezzini
Importance: Although sparse observational studies have suggested a link between migraine and cervical artery dissection (CEAD), any association between the 2 disorders is still unconfirmed. This lack of a definitive conclusion might have implications in understanding the pathogenesis of both conditions and the complex relationship between migraine and ischemic stroke (IS). Objective: To investigate whether a history of migraine and its subtypes is associated with the occurrence of CEAD...
March 6, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28262123/synthesis-and-biological-evaluation-of-nitric-oxide-no-hydrogen-sulfide-h2s-releasing-derivatives-of-s-3-n-butylphthalide-as-potential-antiplatelet-agents
#15
Xiao-Li Wang, Zhao-Ya Wang, Jing-Jing Ling, Yi-Hua Zhang, Jian Yin
In the present study, a series of novel nitric oxide-hydrogen sulfide releasing derivatives of (S)-3-n-butylphthalide ((S)-NBP) were designed, synthesized, and evaluated as potential antiplatelet agents. Compound NOSH-NBP-5 displayed the strongest activity in inhibiting the arachidonic acid (AA)- and adenosine diphosphate (ADP)-induced platelet aggregation in vitro, with 3.8- and 7.0-fold more effectiveness than (S)-NBP, respectively. Furthermore, NOSH-NBP-5 could release moderate levels of NO and H2S, which would be beneficial in improving cardiovascular and cerebral circulation...
December 2016: Chinese Journal of Natural Medicines
https://www.readbyqxmd.com/read/28259479/-management-of-mesenteric-ischemia-in-the-era-of-intestinal-stroke-centers-the-gut-and-lifesaving-strategy
#16
A Nuzzo, O Corcos
Mesenteric ischemia is a gut and life-threatening, medical and surgical, digestive and vascular emergency. Mesenteric ischemia is the result of an arterial or venous occlusion, a vasospasm secondary to low-flow states in intensive care patients, aortic clamping during vascular surgery or intestinal transplantation. Progression towards mesenteric infarction and its complications is unpredictable and correlates with high rates of mortality or a high risk of short bowel syndrome in case of survival. Thus, mesenteric ischemia should be diagnosed and treated at an early stage, when gut injury is still reversible...
March 1, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28255762/semax-an-analog-of-acth-4-7-regulates-expression-of-immune-response-genes-during-ischemic-brain-injury-in-rats
#17
Ekaterina V Medvedeva, Veronika G Dmitrieva, Svetlana A Limborska, Nikolay F Myasoedov, Lyudmila V Dergunova
Brain stroke continues to claim the lives of million people every year. To build the effective strategies for stroke treatment it is necessary to understand the neuroprotective mechanisms that are able to prevent the ischemic injury. Consisting of the ACTH(4-7) fragment and the tripeptide Pro-Gly-Pro (PGP), the synthetic peptide Semax effectively protects brain against ischemic stroke. However, the molecular mechanisms underlying its neuroprotection and participation of PGP in them are still needed to be clarified...
March 2, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28254835/the-learning-healthcare-system-and-cardiovascular-care-a-scientific-statement-from-the-american-heart-association
#18
REVIEW
Thomas M Maddox, Nancy M Albert, William B Borden, Lesley H Curtis, T Bruce Ferguson, David P Kao, Gregory M Marcus, Eric D Peterson, Rita Redberg, John S Rumsfeld, Nilay D Shah, James E Tcheng
The learning healthcare system uses health information technology and the health data infrastructure to apply scientific evidence at the point of clinical care while simultaneously collecting insights from that care to promote innovation in optimal healthcare delivery and to fuel new scientific discovery. To achieve these goals, the learning healthcare system requires systematic redesign of the current healthcare system, focusing on 4 major domains: science and informatics, patient-clinician partnerships, incentives, and development of a continuous learning culture...
March 2, 2017: Circulation
https://www.readbyqxmd.com/read/28245761/micrornas-as-big-regulators-of-neural-stem-progenitor-cell-proliferation-differentiation-and-migration-a-potential-treatment-for-stroke
#19
Qian Zhang, Kaiyuan Zhang, Chao Zhang, Hongfei Ge, Yi Yin, Hua Feng, Rong Hu
BACKGROUND: Neural stem/progenitor cells (NSPCs)-based treatment is a potential therapeutic approach for stroke. MicroRNAs (miRNAs) have been recently verified as promoters or suppressors in the regulation of NSPCs. However, the underlying mechanisms regulating cell biological behaviors of NSPCs remain largely unknown. METHODS: we retrieved papers focusing on potential roles and mechanisms of miRNAs in the regulation of NSPCs, and paid a special attention to clinical therapeutic potentials of miRNAs in stroke patients...
February 28, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28245350/cardiovascular-safety-of-tocilizumab-versus-tumor-necrosis-factor-inhibitors-in-patients-with-rheumatoid-arthritis-a-multi-database-cohort-study
#20
Seoyoung C Kim, Daniel H Solomon, James R Rogers, Sara Gale, Micki Klearman, Khaled Sarsour, Sebastian Schneeweiss
OBJECTIVE: While tocilizumab (TCZ) is known to increase LDL cholesterol, it is unclear whether TCZ increases cardiovascular (CV) risks in patients with rheumatoid arthritis (RA). METHODS: To examine comparative CV safety, we conducted a cohort study of RA patients who newly started TCZ or TNFi using claims data from Medicare, IMS PharMetrics and MarketScan. All patients were required to have previously used a different TNFi, abatacept, or tofacitinib. The primary outcome was a composite CV endpoint of hospitalization for myocardial infarction (MI) or stroke...
February 28, 2017: Arthritis & Rheumatology
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