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Neutrophil stroke

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https://www.readbyqxmd.com/read/29444200/loss-of-sirt3-accelerates-arterial-thrombosis-by-increasing-formation-of-neutrophil-extracellular-traps-and-plasma-tissue-factor-activity
#1
Daniel S Gaul, Julien Weber, Lambertus J Van Tits, Susanna Sluka, Lisa Pasterk, Martin F Reiner, Natacha Calatayud, Christine Lohmann, Roland Klingenberg, Jürgen Pahla, Daria Vdovenko, Felix C Tanner, Giovanni G Camici, Urs Eriksson, Johan Auwerx, François Mach, Stephan Windecker, Nicolas Rodondi, Thomas F L Uuml Scher, Stephan Winnik, Christian M Matter
BACKGROUND: Sirtuin 3 (Sirt3) is a mitochondrial, nicotinamide adenine dinucleotide (NAD+)-dependent deacetylase that reduces oxidative stress by activation of superoxide dismutase 2 (SOD2). Oxidative stress enhances arterial thrombosis. This study investigated the effects of genetic Sirt3 deletion on arterial thrombosis in mice in an inflammatory setting and assessed the clinical relevance of these findings in patients with ST-elevation myocardial infarction (STEMI). Methods and Results: Using a laser-induced carotid thrombosis model with lipopolysaccharide (LPS) challenge, in vivo time to thrombotic occlusion in Sirt3-/- mice (n = 6) was reduced by half compared to Sirt3+/+ wildtype (WT, n = 8, p<0...
February 10, 2018: Cardiovascular Research
https://www.readbyqxmd.com/read/29438080/thrombus-neutrophil-extracellular-traps-content-impair-tpa-induced-thrombolysis-in-acute-ischemic-stroke
#2
Celina Ducroux, Lucas Di Meglio, Stephane Loyau, Sandrine Delbosc, William Boisseau, Catherine Deschildre, Malek Ben Maacha, Raphael Blanc, Hocine Redjem, Gabriele Ciccio, Stanislas Smajda, Robert Fahed, Jean-Baptiste Michel, Michel Piotin, Laurence Salomon, Mikael Mazighi, Benoit Ho-Tin-Noe, Jean-Philippe Desilles
BACKGROUND AND PURPOSE: Neutrophil Extracellular Traps (NETs) are DNA extracellular networks decorated with histones and granular proteins produced by activated neutrophils. NETs have been identified as major triggers and structural factors of thrombosis. A recent study designated extracellular DNA threads from NETs as a potential therapeutic target for improving tissue-type plasminogen activator (tPA)-induced thrombolysis in acute coronary syndrome. The aim of this study was to assess the presence of NETs in thrombi retrieved during endovascular therapy in patients with acute ischemic stroke (AIS) and their impact on tPA-induced thrombolysis...
February 8, 2018: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/29399739/icam-1null-c57bl-6-mice-are-not-protected-from-experimental-ischemic-stroke
#3
Gaby U Enzmann, Sofia Pavlidou, Markus Vaas, Jan Klohs, Britta Engelhardt
Accumulation of neutrophils in the brain is a hallmark of cerebral ischemia and considered central in exacerbating tissue injury. Intercellular adhesion molecule (ICAM)-1 is upregulated on brain endothelial cells after ischemic stroke and considered pivotal in neutrophil recruitment as ICAM-1-deficient mouse lines were found protected from experimental stroke. Translation of therapeutic inhibition of ICAM-1 into the clinic however failed. This prompted us to investigate stroke pathogenesis in Icam1tm1Alb C57BL/6 mutants, a true ICAM-1null mouse line...
February 4, 2018: Translational Stroke Research
https://www.readbyqxmd.com/read/29396861/opposite-impact-of-methylene-tetrahydrofolate-reductase-c677t-and-methylene-tetrahydrofolate-reductase-a1298c-gene-polymorphisms-on-systemic-inflammation
#4
Koroush Khalighi, Gang Cheng, Seyedabbas Mirabbasi, Bahar Khalighi, Yin Wu, Wuqiang Fan
BACKGROUND: Methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms have been found to be related with many diseases. Systemic inflammation is now considered as a major predisposition factor for diseases including diabetes mellitus (DM), coronary arterial disease (CAD), stroke, and cancer. This study aimed to investigate whether systemic inflammation is a possible underlying pathogenesis for MTHFR gene polymorphism-related disease. METHODS: A total of 292 patients were enrolled, and single nucleotide polymorphisms for MTHFR C667T and A1298C were genotyped...
February 3, 2018: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/29375880/absolute-lymphocyte-and-neutrophil-counts-in-neonatal-ischemic-brain-injury
#5
Jessica M Povroznik, Elizabeth B Engler-Chiurazzi, Tania Nanavati, Paola Pergami
Objectives: This study aimed to identify differences in absolute neutrophils, lymphocytes, and neutrophil-to-lymphocyte ratio between neonates with two forms of ischemic brain injury, hypoxic-ischemic encephalopathy, and acute ischemic stroke, compared to controls. We also aimed to determine whether this neutrophil/lymphocyte response pattern is associated with disease severity or is a consequence of the effects of total-body cooling, an approved treatment for moderate-to-severe hypoxic-ischemic encephalopathy...
2018: SAGE Open Medicine
https://www.readbyqxmd.com/read/29373226/multiple-cerebral-infarctions-due-to-patent-foramen-ovale-in-a-patient-with-eosinophilic-granulomatosis-with-polyangiitis
#6
Kota Maekawa, Masunari Shibata, Masaru Seguchi, Kazuto Kobayashi, Yutaka Naito, Fumitaka Miya
A 51-year-old man was diagnosed with eosinophilic granulomatosis with polyangiitis 6 years ago due to asthma, sinusitis, hypereosinophilia, and peripheral neuropathy based on the diagnostic criteria of American College of Rheumatology, and corticosteroid therapy achieved a remission. One year ago, he was hospitalized due to deep venous thrombosis (DVT) and pulmonary embolism, and rivaroxaban was administrated. He was admitted to our hospital for acute onset of diplopia and right hemiparesis. Peripheral blood examinations disclosed leukocytosis with hypereosinophilia...
January 17, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/29371242/plasminogen-activator-inhibitor-1-promotes-neutrophil-infiltration-and-tissue-injury-on-ischemia-reperfusion
#7
Marc Praetner, Gabriele Zuchtriegel, Martin Holzer, Bernd Uhl, Johanna Schaubächer, Laura Mittmann, Matthias Fabritius, Robert Fürst, Stefan Zahler, Dominik Funken, Maximilian Lerchenberger, Andrej Khandoga, Sandip Kanse, Kirsten Lauber, Fritz Krombach, Christoph A Reichel
OBJECTIVE: Ischemia-reperfusion (I/R) injury significantly contributes to organ dysfunction and failure after myocardial infarction, stroke, and transplantation. In addition to its established role in the fibrinolytic system, plasminogen activator inhibitor-1 has recently been implicated in the pathogenesis of I/R injury. The underlying mechanisms remain largely obscure. APPROACH AND RESULTS: Using different in vivo microscopy techniques as well as ex vivo analyses and in vitro assays, we identified that plasminogen activator inhibitor-1 rapidly accumulates on microvascular endothelial cells on I/R enabling this protease inhibitor to exhibit previously unrecognized functional properties by inducing an increase in the affinity of β2 integrins in intravascularly rolling neutrophils...
January 25, 2018: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29345350/activation-of-the-sympathetic-nervous-system-modulates-neutrophil-function
#8
Alyce J Nicholls, Shu Wen Wen, Pam Hall, Michael J Hickey, Connie H Y Wong
Emerging evidence has revealed that noradrenaline (NA), the main neurotransmitter of the sympathetic nervous system (SNS), regulates a variety of immune functions via binding to adrenergic receptors present on immune cells. In this study, we examined the role of NA in the regulation of neutrophil functions. Neutrophils were isolated from the bone marrow of naïve mice and treated with NA at various concentrations to assess the effect on various neutrophil functions. Additionally, we performed cremaster intravital microscopy to examine neutrophil-endothelial cell interactions following NA superfusion in vivo...
December 21, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/29341345/increase-in-neutrophil-after-r-tpa-thrombolysis-predicts-poor-functional-outcome-of-ischemic-stroke-a-longitudinal-study
#9
Jijun Shi, Hao Peng, Shoujiang You, Yuanyuan Liu, Jiaping Xu, Yingying Xu, Huihui Liu, Rongfang Shi, Yongjun Cao, Chun-Feng Liu
BACKGROUND: Neutrophil, a pivotal immune responder to ischemic brain insult, has been involved in neuroplasticity and increases after stroke. r-tPA, a promising treatment improving neuroplasticity, promotes neutrophil degranulation. However, the dynamic profile of neutrophil after r-tPA treatment and its effect on neurological recovery after stroke is not well studied. METHODS: We measured cell counts of neutrophil, lymphocyte, and their ratio (NLR) on admission and 24 hours after r-tPA infusion in 372 consecutively recruited acute ischemic stroke patients (mean age 64 years)...
January 17, 2018: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29336254/colchicine-in-neurosurgery
#10
Drosos Evangelos, Giakoumettis Dimitrios, Themistocleous S Marios
BACKGROUND: Colchicine is an ancient drug. Many uses have been reported in medical books and reports through the centuries. Currently the understanding of its mechanism of action has opened new horizons to its use. OBJECTIVE: This article aims to discuss the use of colchicine in various neurosurgical conditions. METHODS: A pubmed database and clinical trials search was performed, using the key words "colchicine", "Neurosurgery", "low back pain", "stroke" and glioma"...
January 14, 2018: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/29335483/pilot-study-to-assess-visualization-and-therapy-of-inflammatory-mechanisms-after-vessel-reopening-in-a-mouse-stroke-model
#11
Ebba Beller, Laura Reuter, Anne Kluge, Christine Preibisch, Ute Lindauer, Alexei Bogdanov, Friederike Lämmer, Claire Delbridge, Kaspar Matiasek, Benedikt J Schwaiger, Tobias Boeckh-Behrens, Claus Zimmer, Alexandra S Gersing
After reperfusion therapy in stroke patients secondary inflammatory processes may increase cerebral damage. In this pilot study, effects of anti-inflammatory therapy were assessed in a middle cerebral artery occlusion (MCAO) mouse model after reperfusion. 1 hour after MCAO, the artery was reopened and tacrolimus or NaCl were administered intra-arterially. Perfusion-weighted (PWI) and diffusion-weighted images (DWI) were obtained by MRI during MCAO. DWI, T2- and T1-weighted images with and without Bis-5HT-DTPA administration were obtained 24 hours after MCAO...
January 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29325217/neutrophil-infiltration-to-the-brain-is-platelet-dependent-and-is-reversed-by-blockade-of-platelet-gpib%C3%AE
#12
James A Giles, Andrew D Greenhalgh, Adam Denes, Bernhard Nieswandt, Graham Coutts, Barry W McColl, Stuart M Allan
Neutrophils are key components of the innate immune response, providing host defence against infection and being recruited to non-microbial injury sites. Platelets act as a trigger for neutrophil extravasation to inflammatory sites but mechanisms and tissue-specific aspects of these interactions are currently unclear. Here, we use bacterial endotoxin in mice to trigger an innate inflammatory response in different tissues and measure neutrophil invasion with or without platelet reduction. We show that platelets are essential for neutrophil infiltration to the brain, peritoneum and skin, neutrophil numbers returning to basal levels in the peritoneum and skin and being decreased (~60%) in the brain when platelets are reduced...
January 11, 2018: Immunology
https://www.readbyqxmd.com/read/29317141/serum-levels-of-osteopontin-predict-major-adverse-cardiovascular-events-in-patients-with-severe-carotid-artery-stenosis
#13
Federico Carbone, Fabio Rigamonti, Fabienne Burger, Aline Roth, Maria Bertolotto, Giovanni Spinella, Bianca Pane, Domenico Palombo, Aldo Pende, Aldo Bonaventura, Luca Liberale, Alessandra Vecchié, Franco Dallegri, François Mach, Fabrizio Montecucco
BACKGROUND: Inflammatory mediators in the blood stream and within plaques are key determinants in atherogenesis. Here, we investigated serum osteopontin (OPN) as a potential predictor of poor outcome in patients with severe carotid atherosclerosis. METHODS: Carotid plaques and serum were collected from patients asymptomatic (n=185) or symptomatic (n=40) for ischemic stroke. Plaques were stained for lipids, smooth muscle cells, neutrophils, M1 and M2 macrophage subsets and matrix metallopropteinase-9 (MMP-9)...
January 5, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29304522/the-pathophysiological-role-of-neutrophil-extracellular-traps-in-inflammatory-diseases
#14
Aldo Bonaventura, Luca Liberale, Federico Carbone, Alessandra Vecchié, Candela Diaz-Cañestro, Giovanni G Camici, Fabrizio Montecucco, Franco Dallegri
Neutrophil pathogen-killing mechanism termed neutrophil extracellular traps (NETs) has been recently identified. NETs consist of chromatin and histones along with serine proteases and myeloperoxidase and are induced by a great variety of infectious and non-infectious stimuli . NETosis is a kind of programmed neutrophil death characterized by chromatin decondensation and release of nuclear granular contents, mainly driven by peptidylarginine deiminase 4 citrullination of histones. Although classically related to the protection against infectious pathogens, nowadays NETs have been described as a player of several pathophysiological processes...
January 2018: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/29288632/association-of-vascular-indices-with-novel-circulating-biomarkers-as-prognostic-factors-for-cardiovascular-complications-in-patients-with-type-2-diabetes-mellitus
#15
Katerina K Naka, Katerina Papathanassiou, Aris Bechlioulis, Konstantinos Pappas, Stelios Tigas, Dimitrios Makriyiannis, Sophia Antoniou, Nikolaos Kazakos, Alexandra Margeli, Ioannis Papassotiriou, Agathocles Tsatsoulis, Lampros K Michalis
BACKGROUND: The pathophysiology of atherosclerosis in type 2 diabetes mellitus (T2DM) is multifactorial. The association of vascular indices with circulating biomarkers of inflammation and insulin resistance and their role in the long-term cardiovascular prognosis in T2DM patients were currently investigated. PATIENTS AND METHODS: Patients with T2DM and poor glycemic control without known cardiovascular diseases (n=119) at baseline were enrolled and followed for about 9years...
December 27, 2017: Clinical Biochemistry
https://www.readbyqxmd.com/read/29282627/association-between-splenic-contraction-and-the-systemic-inflammatory-response-after-acute-ischemic-stroke-varies-with-age-and-race
#16
Alicia Zha, Farhaan Vahidy, Jaskaren Randhawa, Kaushik Parsha, Thanh Bui, Jaroslaw Aronowski, Sean I Savitz
Animal models have demonstrated the deleterious contribution of splenic immunocytes on secondary brain injury after stroke. While previous work has demonstrated splenic contraction (SC) in patients with acute ischemic stroke (AIS) and intracranial hemorrhage (ICH), no clinical studies have examined the relationship between the systemic inflammatory response syndrome (SIRS) with SC in stroke patients. This is a retrospective analysis of a previous prospective observational study where daily spleen sizes were evaluated in 178 acute stroke patients...
December 27, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/29277912/a-hemorrhagic-transformation-model-of-mechanical-stroke-therapy-with-acute-hyperglycemia-in-mice
#17
David Couret, Steeve Bourane, Aurélie Catan, Brice Nativel, Cynthia Planesse, Anne-Claire Dorsemans, Imade Ait-Arsa, Maxime Cournot, Philippe Rondeau, Jessica Patche, Alexy Tran-Dinh, Gilles Lambert, Nicolas Diotel, Olivier Meilhac
Clinical benefit for mechanical thrombectomy (MT) in stroke was recently demonstrated in multiple large prospective studies. Acute hyperglycemia (HG) is an important risk factor of poor outcome in stroke patients, including those that underwent MT. The aim of this therapy is to achieve a complete reperfusion in a short time, given that reperfusion damage is dependent on the duration of ischemia. Here, we investigated the effects of acute HG in a mouse model of ischemic stroke induced by middle cerebral artery occlusion (MCAO)...
December 26, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29260039/intracerebral-hemorrhage-after-iv-tpa-for-stroke-as-early-symptom-of-anca-associated-vasculitis
#18
Neda Zarghami Esfahani, Daniel M Anderson, Connie Pieper, Harold P Adams
Anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitides (AAV) are rare diseases characterized by a necrotizing small-vessel vasculitis and circulating ANCA that comprise granulomatosis with polyangiitis, microscopic polyangiitis, and eosinophilic granulomatosis with polyangiitis (EGPA). Acute ischemic stroke (AIS) can be a manifestation of central nervous system (CNS) involvement in these diseases. Furthermore, intracerebral hemorrhage (ICH) is a potential complication of these necrotizing vasculitides...
December 2017: ENeurologicalSci
https://www.readbyqxmd.com/read/29258866/suppression-of-nlrp3-attenuates-hemorrhagic-transformation-after-delayed-rtpa-treatment-in-thromboembolic-stroke-rats-involvement-of-neutrophil-recruitment
#19
Zhiliang Guo, Shuhong Yu, Xin Chen, Ping Zheng, Ting Hu, Zhenhui Duan, Xiaoyun Liu, Qian Liu, Ruidong Ye, Wusheng Zhu, Xinfeng Liu
BACKGROUND: Inflammation and neutrophils play pivotal roles in hemorrhagic transformation (HT) after recombinant tissue plasminogen activator (rtPA) treatment in stroke; however, the contribution of Nod-like receptor protein 3 (NLRP3), a key component of the innate immune system, is not yet known. This study aimed to explore the role of NLRP3 in the delayed rtPA-induced HT and its association with the neutrophil recruitment. METHODS: Rats were subjected to thromboembolic focal cerebral ischemia and delayed rtPA treatment at 4 h after ischemia to mimic HT...
December 16, 2017: Brain Research Bulletin
https://www.readbyqxmd.com/read/29227024/blood-biomarkers-as-predictors-of-long-term-mortality-in-copd
#20
Angelico Mendy, Erick Forno, Theophile Niyonsenga, Janvier Gasana
BACKGROUND: Blood biomarkers are easily accessible and might reflect chronic obstructive pulmonary disease (COPD) activity. AIM: The aim of this study was to determine whether a panel of blood biomarkers [C-reactive protein (CRP), neutrophils, eosinophils, albumin and vitamin D] could predict mortality in COPD. METHODS: We analyzed data from 431 COPD participants to the 2007-2010 National Health and Nutrition Examination Surveys who were followed for a median time of 36 months...
December 11, 2017: Clinical Respiratory Journal
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