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Macrophage stroke

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https://www.readbyqxmd.com/read/29152223/stage-1-registered-report-effect-of-deficient-phagocytosis-on-neuronal-survival-and-neurological-outcome-after-temporary-middle-cerebral-artery-occlusion-tmcao
#1
Julius V Emmrich, Jonas J Neher, Philipp Boehm-Sturm, Matthias Endres, Ulrich Dirnagl, Christoph Harms
Stroke is a major cause of death and disability worldwide. In addition to neuronal death resulting directly from energy depletion due to lack of blood supply, inflammation and microglial activation following ischemic brain injury has been increasingly recognized to be a key contributor to the pathophysiology of cerebrovascular disease. However, our understanding of the cross talk between the ischemic brain and the immune system is limited. Recently, we demonstrated that following focal ischemia, death of mature viable neurons can be executed through phagocytosis by microglial cells or recruited macrophages, i...
2017: F1000Research
https://www.readbyqxmd.com/read/29131464/interferon-regulatory-factor-4-5-signaling-impacts-on-microglial-activation-after-ischemic-stroke-in-mice
#2
Abdullah Al Mamun, Anjali Chauhan, Haifu Yu, Yan Xu, Romana Sharmeen, Fudong Liu
Microglial activation is a key element in initiating and perpetuating inflammatory responses to stroke. Interferon regulatory factor 5 (IRF5) and IRF4 signaling have been found critical in mediating macrophage pro-inflammatory (M1) and anti-inflammatory (M2) phenotypes respectively in peripheral inflammation. We hypothesize that the IRF5/4 regulatory axis also mediates microglial activation after stroke. C57BL6 mice of 8-12 weeks were subject to a 90-minute middle cerebral artery occlusion and the brains evaluated at 24h, 3d, 10d and 30d after reperfusion...
November 13, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29111308/inhibition-of-microrna-210-suppresses-pro-inflammatory-response-and-reduces-acute-brain-injury-of-ischemic-stroke-in-mice
#3
Lei Huang, Qingyi Ma, Yong Li, Bo Li, Lubo Zhang
Stroke is a leading cause of mortality and chronic neurologic disability. Yet, the successful treatment remains limited. In this study, we investigated the efficacy and the mechanism of a novel treatment, microRNA-210 (miR-210) inhibition, in protecting acute ischemic brain injury in adult mice. Focal cerebral ischemia was induced by middle cerebral artery occlusion (MCAO) in adult male C57BL/6 mice. MiR-210-LNA (miR-210 inhibitor) or the negative control was administered via intracerebroventricular injection 24h prior or 4h after MCAO...
October 27, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/29110250/treatment-with-the-ppar%C3%AE-agonist-pioglitazone-in-the-early-post-ischemia-phase-inhibits-pro-inflammatory-responses-and-promotes-neurogenesis-via-the-activation-of-innate-and-bone-marrow-derived-stem-cells-in-rats
#4
Tomoya Kinouchi, Kenji Shimada, Kenji Yagi, Yoshiteru Tada, Nobuhisa Matsushita, Yoshitaka Kurashiki, Junichiro Satomi, Masataka Sata, Shinji Nagahiro
Neurogenesis is essential for a good post-stroke outcome. Exogenous stem cells are currently being tested to promote neurogenesis after stroke. Elsewhere, we demonstrated that treatment with the PPARγ agonist pioglitazone (PGZ) before cerebral ischemia induction reduced brain damage and activated survival-related genes in ovariectomized (OVX) rats. Here, we tested our hypothesis that post-ischemia treatment with PGZ inhibits brain damage and contributes to neurogenesis via activated stem cells. Bone marrow (BM) cells of 7-week-old Wistar female rats were replaced with BM cells from green fluorescent protein-transgenic (GFP(+BM)) rats...
November 6, 2017: Translational Stroke Research
https://www.readbyqxmd.com/read/29101839/community-based-statins-and-advanced-carotid-plaque-role-of-cd163-positive-macrophages-in-lipoprotein-associated-phospholipase-a2-activity-in-atherosclerotic-plaque
#5
Fumiyuki Otsuka, XiaoQing Zhao, Hugh H Trout, Ye Qiao, Bruce A Wasserman, Masataka Nakano, Colin H Macphee, Martin Brandt, Sue Krug-Gourley, Liang Guo, Elena R Ladich, Qi Cheng, Harry R Davis, Aloke V Finn, Renu Virmani, Frank D Kolodgie
BACKGROUND AND AIMS: Lipoprotein-associated phospholipase A2 (Lp-PLA2), an enzymatic inflammatory biomarker primarily bound to low-density lipoprotein cholesterol, is associated with an approximate twofold increased risk of cardiovascular disease and stroke. Despite indications that circulating Lp-PLA2 is sensitive to statins, it remains largely unknown whether statin usage exerts local effects on Lp-PLA2 expression at the site of atheromatous plaque. METHODS: Carotid plaques (n = 38) were prospectively collected from symptomatic (n = 18) and asymptomatic (n = 20) patients with (n = 20) or without (n = 18) documented statin history...
October 14, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/29039441/rivaroxaban-attenuates-thrombosis-by-targeting-the-nf-%C3%AE%C2%BAb-signaling-pathway-in-a-rat-model-of-deep-venous-thrombus
#6
Junhao Ma, Xinxi Li, Yang Wang, Zhenwei Yang, Jun Luo
Anticoagulant therapy is commonly used for the prevention and treatment of patients with deep venous thrombus. Evidence has shown that rivaroxaban is a potential oral anticoagulant drug for the acute treatment of venous thromboembolism. However, the rivaroxaban-mediated molecular mechanism involved in the progression of deep venous thrombosis has not been investigated. In the present study, we investigated the efficacy of rivaroxaban and the underlying signaling pathways in the prevention and treatment of rats with deep venous thrombosis...
September 29, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29030487/macrophage-specific-expression-of-il-37-in-hyperlipidemic-mice-attenuates-atherosclerosis
#7
Sara McCurdy, Yvonne Baumer, Emma Toulmin, Bog-Hieu Lee, William A Boisvert
Atherosclerosis, the progressive buildup of plaque within arterial blood vessels, can lead to fatal downstream events, such as heart attack or stroke. A key event contributing to the development of atherosclerosis is the infiltration of monocytes and its associated inflammation, as well as the formation of lipid-laden macrophage foam cells within the vessel wall. IL-37 is recognized as an important anti-inflammatory cytokine expressed especially by immune cells. This study was undertaken to elucidate the role of macrophage-expressed IL-37 in reducing the production and effects of proinflammatory cytokines, preventing foam cell formation, and reducing the development of atherosclerosis...
November 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29027964/microglia-and-monocytes-macrophages-polarization-reveal-novel-therapeutic-mechanism-against-stroke
#8
REVIEW
Masato Kanazawa, Itaru Ninomiya, Masahiro Hatakeyama, Tetsuya Takahashi, Takayoshi Shimohata
Stroke is a leading cause of morbidity and mortality worldwide, and consists of two types, ischemic and hemorrhagic. Currently, there is no effective treatment to increase the survival rate or improve the quality of life after ischemic and hemorrhagic stroke in the subacute to chronic phases. Therefore, it is necessary to establish therapeutic strategies to facilitate functional recovery in patients with stroke during both phases. Cell-based therapies, using microglia and monocytes/macrophages preconditioned by optimal stimuli and/or any therapies targeting these cells, might be an ideal therapeutic strategy for managing stroke...
October 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29017492/electroacupuncture-ameliorating-post-stroke-cognitive-impairments-via-inhibition-of-peri-infarct-astroglial-and-microglial-macrophage-p2-purinoceptors-mediated-neuroinflammation-and-hyperplasia
#9
Jia Huang, Xiaofang You, Weilin Liu, Changming Song, Xiaomin Lin, Xiufeng Zhang, Jing Tao, Lidian Chen
BACKGROUND: During ischemic stroke (IS), adenosine 5'-triphosphate (ATP) is released from damaged nerve cells of the infract core region to the extracellular space, invoking peri-infarct glial cellular P2 purinoceptors singling, and causing pro-inflammatory cytokine secretion, which is likely to initiate or aggravate motor and cognitive impairment. It has been proved that electroacupuncture (EA) is an effective and safe strategy used in anti-inflammation. However, EA for the role of purine receptors in the central nervous system has not yet been reported...
October 10, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/29017449/circulating-adipocyte-fatty-acid-binding-protein-is-a-predictor-of-cardiovascular-events-in-patients-with-stable-angina-undergoing-percutaneous-coronary-intervention
#10
Wataru Takagi, Toru Miyoshi, Masayuki Doi, Keisuke Okawa, Kazumasa Nosaka, Tomoyuki Nishibe, Naoaki Matsuo, Satoshi Hirohata, Hiroshi Ito
BACKGROUND: Adipocyte fatty acid-binding protein (A-FABP) is expressed in both adipocytes and macrophages. Recent studies have shown that A-FABP is secreted by adipocytes and that the A-FABP concentration is associated with obesity, insulin resistance, and atherosclerosis. We have reported that the coronary atherosclerotic burden is associated with the serum A-FABP concentration. In the present study, we investigated whether the serum A-FABP concentration is associated with prognosis in patients with stable angina pectoris who have undergone percutaneous coronary intervention (PCI)...
October 10, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/28993752/histological-characteristics-of-intracranial-atherosclerosis-in-a-chinese-population-a-postmortem-study
#11
Wen Jie Yang, Mark Fisher, Lu Zheng, Chun Bo Niu, Annlia Paganini-Hill, Hai Lu Zhao, Yun Xu, Ka Sing Wong, Ho Keung Ng, Xiang Yan Chen
BACKGROUND: Anterior and posterior circulation atherosclerosis differ in vascular risk factors and stroke mechanisms. However, few studies have compared the pathological features between these lesions. Using a series of intracranial artery specimens, we characterized the intracranial atherosclerotic lesions and compared pathological features among different arteries of the intracranial vasculature. METHODS: Intracranial large arteries of 32 consecutively recruited autopsy cases of Chinese adults aged 45 years or older were examined pathologically using routine histology and immunostaining, to characterize the pathological features of the atherosclerotic lesions...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28983775/deficiency-of-adenosine-deaminase-2-dada2-an-inherited-cause-of-polyarteritis-nodosa-and-a-mimic-of-other-systemic-rheumatologic-disorders
#12
REVIEW
Hasan Hashem, Susan J Kelly, Nancy J Ganson, Michael S Hershfield
PURPOSE OF REVIEW: A new autoinflammatory disease, deficiency of adenosine deaminase 2 (DADA2), caused by mutations in the CECR1 gene, was first reported in 2014. This review aims to update progress in defining, treating, and understanding this multi-faceted disorder. RECENT FINDINGS: DADA2 was first described in patients with systemic inflammation, mild immune deficiency, and vasculopathy manifested as recurrent stroke or polyarteritis nodosa (PAN). More than 125 patients have now been reported, and the phenotype has expanded to include children and adults presenting primarily with pure red cell aplasia (PRCA), or with antibody deficiency...
October 5, 2017: Current Rheumatology Reports
https://www.readbyqxmd.com/read/28983597/mediating-macrophage-immunity-with-wogonin-in-mice-with-vascular-inflammation
#13
Jingwei Wang, Kunxia Li, Yupeng Li, Yulin Wang
Vascular inflammation may induce a number of diseases, including organ damage or failure, heart attack and stroke. The present study aimed to investigate the use of wogonin, a compound extracted from herbs, to mediate inflammatory reactions in vascular inflammation. Wogonin was loaded in a well‑characterized polymeric biomaterial carrier. In mice with streptozotocin‑induced vascular inflammation, wogonin treatment regulated the production of inflammatory cytokines, including interleukin‑6, tumor necrosis factor‑α and granulocyte macrophage colony‑stimulating factor...
December 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28975971/the-relationship-between-serum-cxcl16-level-and-carotid-vulnerable-plaque-in-patients-with-ischemic-stroke
#14
G Jin
OBJECTIVE: We investigated the relationship between the serum macrophage chemokine ligand 16 (CXCL16) levels and the vulnerable carotid plaque in patients with ischemic stroke. PATIENTS AND METHODS: We successively selected 118 cases of patients with an initial diagnosis of acute ischemic stroke (time of onset < 72 h), recorded risk factors, including gender, age, family history, smoking, body mass index, blood glucose levels, blood lipid levels, average systolic pressure and diastolic blood pressure (DBP) and homocysteine levels...
October 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28972541/camkii%C3%AE-suppresses-an-efferocytosis-pathway-in-macrophages-and-promotes-atherosclerotic-plaque-necrosis
#15
Amanda C Doran, Lale Ozcan, Bishuang Cai, Ze Zheng, Gabrielle Fredman, Christina C Rymond, Bernhard Dorweiler, Judith C Sluimer, Joanne Hsieh, George Kuriakose, Alan R Tall, Ira Tabas
Atherosclerosis is the underlying etiology of cardiovascular disease, the leading cause of death worldwide. Atherosclerosis is a heterogeneous disease in which only a small fraction of lesions lead to heart attack, stroke, or sudden cardiac death. A distinct type of plaque containing large necrotic cores with thin fibrous caps often precipitates these acute events. Here, we show that Ca2+/calmodulin-dependent protein kinase γ (CaMKIIγ) in macrophages plays a major role in the development of necrotic, thin-capped plaques...
November 1, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28935424/temporal-remodeling-of-pial-collaterals-and-functional-deficits-in-a-murine-model-of-ischemic-stroke
#16
Benjamin Okyere, Miranda Creasey, Yeonwoo Lebovitz, Michelle H Theus
BACKGROUND: Leptomeningeal anastomoses play a critical role in regulating reperfusion following cerebrovascular obstruction; however, methods to evaluate their temporospatial remodeling remains under investigation. NEW METHOD: We combined arteriole-specific vessel painting with histological evaluation to assess the density and diameter of inter-collateral vessels between the middle cerebral artery and anterior cerebral artery (MCA-ACA) or posterior cerebral artery (MCA-PCA) in a murine model of permanent middle cerebral artery occlusion (pMCAO)...
September 18, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28932115/the-long-term-fate-of-mesenchymal-stem-cells-labeled-with-magnetic-resonance-imaging-visible-polymersomes-in-cerebral-ischemia
#17
Xiaohui Duan, Liejing Lu, Yong Wang, Fang Zhang, Jiaji Mao, Minghui Cao, Bingling Lin, Xiang Zhang, Xintao Shuai, Jun Shen
Understanding the long-term fate and potential mechanisms of mesenchymal stem cells (MSCs) after transplantation is essential for improving functional benefits of stem cell-based stroke treatment. Magnetic resonance imaging (MRI) is considered an attractive and clinically translatable tool for longitudinal tracking of stem cells, but certain controversies have arisen in this regard. In this study, we used SPION-loaded cationic polymersomes to label green fluorescent protein (GFP)-expressing MSCs to determine whether MRI can accurately reflect survival, long-term fate, and potential mechanisms of MSCs in ischemic stroke therapy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28915130/dolichoectasia-of-vertebrobasilar-arteries-as-a-cause-of-hydrocephalus-and-ischemic-cerebral-stroke
#18
Miodrag Zdravković, Milos Kostov, Sladjana Petrovic, Jovana Zdravkovic
INTRODUCTION: Dolichoectasia of vertebrobasilar artery is a rare vasculopathy, which is characterized by ectasia, elongation, and tortuosity of the basilar artery. CASE DESCRIPTION: A 85-year-old man was referred to the Clinic of Neurology with sudden-onset coma. A brain computed tomography scan showed remarkable fusiform dilatation with elongation of basilar artery, with compressive effect on brain stem. Autopsy confirmed existence of vertebrobasilar dolichoectasia, with organized old thrombus and partially with recent occlusive thrombosis...
December 2017: American Journal of Forensic Medicine and Pathology
https://www.readbyqxmd.com/read/28905935/age-related-differences-in-interferon-regulatory-factor-4-and-5-signaling-in-ischemic-brains-of-mice
#19
Shou-Cai Zhao, Chun Wang, Heng Xu, Wen-Qian Wu, Zhao-Hu Chu, Ling-Song Ma, Ying-Dong Zhang, Fudong Liu
Stroke is a disease that mainly affects the elderly. Since the age-related differences in stroke have not been well studied, modeling stroke in aged animals is clinically more relevant. The inflammatory responses to stroke are a fundamental pathological procedure, in which microglial activation plays an important role. Interferon regulatory factor-5 (IRF5) and IRF4 regulate M1 and M2 activation of macrophages, respectively, in peripheral inflammation; but it is unknown whether IRF5/IRF4 are also involved in cerebral inflammatory responses to stroke and whether age-related differences of the IRF5/IRF4 signaling exist in ischemic brain...
November 2017: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/28878349/peptide-mediated-delivery-of-donor-mitochondria-improves-mitochondrial-function-and-cell-viability-in-human-cybrid-cells-with-the-melas-a3243g-mutation
#20
Jui-Chih Chang, Fredrik Hoel, Ko-Hung Liu, Yau-Huei Wei, Fu-Chou Cheng, Shou-Jen Kuo, Karl Johan Tronstad, Chin-San Liu
The cell penetrating peptide, Pep-1, has been shown to facilitate cellular uptake of foreign mitochondria but further research is required to evaluate the use of Pep-1-mediated mitochondrial delivery (PMD) in treating mitochondrial defects. Presently, we sought to determine whether mitochondrial transplantation rescue mitochondrial function in a cybrid cell model of mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) disease. Following PMD, recipient cells had internalized donor mitochondria after 1 h, and expressed higher levels of normal mitochondrial DNA, particularly at the end of the treatment and 11 days later...
September 6, 2017: Scientific Reports
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