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Neutrophil traps

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https://www.readbyqxmd.com/read/28733990/dimethyl-fumarate-modulates-neutrophil-extracellular-trap-formation-in-a-glutathione-and-superoxide-dependent-manner
#1
J H O Hoffmann, K Schaekel, D Hartl, A H Enk, E N Hadaschik
BACKGROUND: Neutrophil (polymorphonuclear) granulocytes (PMN) were shown to contribute to the pathogenesis of psoriasis by releasing IL-17 and LL-37/ DNA complexes via neutrophil extracellular traps (NET), webs of chromatin strands decorated with antimicrobial peptides, in psoriatic skin. Fumaderm(®) , a fumaric acid ester (FAE) formulation consisting of different FAE salts has been successfully used to treat psoriasis for decades. Most recently, FAE treatment was reported to inhibit NET formation in murine epidermolysis bullosa acquisita...
July 22, 2017: British Journal of Dermatology
https://www.readbyqxmd.com/read/28730407/venous-thromboembolism-thrombosis-inflammation-and-immunothrombosis-for-clinicians
#2
REVIEW
Eduardo Vazquez-Garza, Carlos Jerjes-Sanchez, Aline Navarrete, Jorge Joya-Harrison, David Rodriguez
Venous thromboembolism (VTE) is a worldwide disease related with mortality, cardiovascular disability, impaired quality of life and, cause major long-term complications. Clinicians related to the acute and long-term patients care must be involved in the molecular mechanisms of thrombosis. The vessel wall and its inner lining of the endothelium are critical to the maintenance of a patent vasculature. After endothelial disruption, collagen (first line of endothelial defense) and intravascular tissue factor (second line of endothelial defense) are exposed to blood flow, starting the formation of a thrombus...
July 20, 2017: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/28730145/prokaryotic-rna-associated-to-bacterial-viability-induces-polymorphonuclear-neutrophil-activation
#3
Nahuel Rodriguez-Rodrigues, Luis A Castillo, Verónica I Landoni, Daiana Martire-Greco, M Ayelén Milillo, Paula Barrionuevo, Gabriela C Fernández
Polymorphonuclear neutrophils (PMN) are the first cellular line of antibacterial host defense. They sense pathogens through recognition of pathogen-associated molecular patterns (PAMPs) by innate pattern recognition receptors, such as Toll-like receptors (TLR). The aim of this study was to investigate whether PMN sense bacterial viability and explore which viability factor could be involved in this phenomenon. For this purpose, different functions were evaluated in isolated human PMN using live Escherichia coli (Ec) and heat-killed Ec (HK-Ec)...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28727215/neutrophil-extracellular-traps-coincide-with-a-pro-coagulant-status-of-microcirculatory-endothelium-in-burn-wounds
#4
H Ibrahim Korkmaz, Magda M W Ulrich, Sanne Vogels, Tim de Wit, Paul P M van Zuijlen, Paul A J Krijnen, Hans W M Niessen
Burn-induced tissue loss is partly related to secondary expansion of necrosis into vital dermis neighbouring the initial burn injury. An important factor herein is the severe loss of perfusion of the burn wound, probably caused by microvascular damage induced by the intense local inflammatory responses as well as burn-induced hypercoagulation. We hypothesize that the formation of Neutrophilic Extracellular Traps (NETs) play an important role in this. The purpose of this study was to investigate post-burn intravascular thrombosis, NETs formation and the coagulant state in the microvasculature of burns in both animal models and patients...
July 20, 2017: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/28720648/neutrophil-extracellular-traps-induced-by-cigarette-smoke-activate-plasmacytoid-dendritic-cells
#5
Shi-Lin Qiu, Hui Zhang, Qi-Ya Tang, Jing Bai, Zhi-Yi He, Jian-Quan Zhang, Mei-Hua Li, Jing-Min Deng, Guang-Nan Liu, Xiao-Ning Zhong
BACKGROUND: Neutrophil extracellular traps (NETs) represent a distinct strategy by which neutrophils trap, confine and eliminate invading microorganisms. Emerging evidence suggests that NETs exert a deleterious effect to the host in the absence of microbial stimuli. However, the role of NETs in smoking-related lung diseases remains to be elucidated. OBJECTIVES: To evaluate the formation of NETs in the context of chronic inflammation induced by cigarette smoking and explore its potential role in an experimental mouse model of emphysema...
July 18, 2017: Thorax
https://www.readbyqxmd.com/read/28719602/prehospital-immune-responses-and-development-of-multiple-organ-dysfunction-syndrome-following-traumatic-injury-a-prospective-cohort-study
#6
Jon Hazeldine, David N Naumann, Emma Toman, David Davies, Jonathan R B Bishop, Zhangjie Su, Peter Hampson, Robert J Dinsdale, Nicholas Crombie, Niharika Arora Duggal, Paul Harrison, Antonio Belli, Janet M Lord
BACKGROUND: Almost all studies that have investigated the immune response to trauma have analysed blood samples acquired post-hospital admission. Thus, we know little of the immune status of patients in the immediate postinjury phase and how this might influence patient outcomes. The objective of this study was therefore to comprehensively assess the ultra-early, within 1-hour, immune response to trauma and perform an exploratory analysis of its relationship with the development of multiple organ dysfunction syndrome (MODS)...
July 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28715618/measurement-of-net-formation-in-vitro-and-in-vivo-by-flow-cytometry
#7
Sakiko Masuda, Sakika Shimizu, Junji Matsuo, Yuka Nishibata, Yoshihiro Kusunoki, Fumihiko Hattanda, Haruki Shida, Daigo Nakazawa, Utano Tomaru, Tatsuya Atsumi, Akihiro Ishizu
Neutrophil extracellular traps (NETs) are extracellular chromatin fibers adorned with antimicrobial proteins, such as myeloperoxidase (MPO), which are extruded from activated neutrophils. NETosis is the metamorphosis of neutrophils with NET formation that follows decondensation of DNA and rupture of the plasma membrane. Although NETs play important roles in innate immunity, excessive formation of NETs can be harmful to the hosts. Until now, various methods for evaluation of NETs have been reported. Although each has a virtue, the gold standard has not been established...
July 17, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28712636/human-exoproteome-in-acute-apical-abscesses
#8
Cristiane F Alfenas, Tiago A O Mendes, Humberto J O Ramos, Fernanda P Bruckner, Henrique S Antunes, Isabela N Rôças, José F Siqueira, José C Provenzano
INTRODUCTION: An acute apical abscess is a severe response of the host to massive invasion of the periapical tissues by bacteria from infected root canals. Although many studies have investigated the microbiota involved in the process, information on the host factors released during abscess formation is scarce. The purpose of this study was to describe the human exoproteome in samples from acute apical abscesses. METHODS: Fourteen pus samples were obtained by aspiration from patients with an acute apical abscess...
July 13, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28705839/circulating-dsdna-endothelial-injury-and-complement-activation-in-thrombotic-microangiopathy-and-gvhd
#9
Nicholas J Gloude, Pooja Khandelwal, Nathan Luebbering, Dana T Lounder, Sonata Jodele, Matthew N Alder, Adam Lane, Alyss Wilkey, Kelly E Lake, Bridget Litts, Stella M Davies
TA-TMA is a common and poorly recognized complication of HSCT associated with excessive complement activation, likely triggered by endothelial injury. An important missing piece is the link between endothelial injury and complement activation. We hypothesized that neutrophil extracellular traps (NETs) mechanistically link endothelial damage with complement activation and subsequent TA-TMA. Neutrophil activation releases granule proteins together with double stranded DNA (dsDNA), to form extracellular fibers known as NETs...
July 13, 2017: Blood
https://www.readbyqxmd.com/read/28703297/neither-eosinophils-nor-neutrophils-require-atg5-dependent-autophagy-for-extracellular-dna-trap-formation
#10
Nina Germic, Darko Stojkov, Kevin Oberson, Shida Yousefi, Hans-Uwe Simon
The importance of extracellular traps (ETs) in innate immunity is well established, but the molecular mechanisms responsible for their formation remain unclear and in scientific dispute. ETs have been defined as extracellular DNA scaffolds associated with the granule proteins of eosinophils or neutrophils. They are capable of killing bacteria extracellularly. Based mainly on results with phosphoinositide 3-kinase (PI3K) inhibitors such as 3-methyladenine (3-MA) and wortmannin which are commonly used to inhibit autophagy, several groups have reported that autophagy is required for neutrophil extracellular trap (NET) formation...
July 13, 2017: Immunology
https://www.readbyqxmd.com/read/28696508/neutrophil-extracellular-traps-in-ischemic-stroke-thrombi
#11
Elodie Laridan, Frederik Denorme, Linda Desender, Olivier François, Tommy Andersson, Hans Deckmyn, Karen Vanhoorelbeke, Simon F De Meyer
OBJECTIVE: Neutrophil extracellular traps (NETs) have been shown to promote thrombus formation. Little is known about the exact composition of thrombi that cause ischemic stroke. In particular no information is yet available on the presence of NETs in cerebral occlusions. Such information is however essential to improve current thrombolytic therapy with t-PA. This study aimed at investigating the presence of neutrophils and more specifically NETs in ischemic stroke thrombi. METHODS: Sixty-eight thrombi retrieved from ischemic stroke patients undergoing endovascular treatment were characterized by immunostaining using neutrophil markers (CD66b and neutrophil elastase) and NETs markers (citrullinated histones H3 (H3Cit) and extracellular DNA)...
July 11, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28684614/ubiquinol-effects-on-antiphospholipid-syndrome-prothrombotic-profile-a-randomized-placebo-controlled-trial
#12
Carlos Pérez-Sánchez, María Ángeles Aguirre, Patricia Ruiz-Limón, María Carmen Abalos-Aguilera, Yolanda Jiménez-Gómez, Iván Arias-de la Rosa, Antonio Rodriguez-Ariza, Lucía Fernández-Del Río, José Antonio Gonzalez-Reyes, Pedro Segui, Eduardo Collantes-Estévez, Nuria Barbarroja, Francisco Velasco, Savino Sciascia, Irene Cecchi, María José Cuadrado, José Manuel Villalba, Chary López-Pedrera
OBJECTIVE: Antiphospholipid syndrome (APS) leukocytes exhibit an oxidative perturbation, directly linked to alterations in mitochondrial dynamics and metabolism. This disturbance is related to the patients' prothrombotic status and can be prevented by in vitro treatment with coenzyme Q10. Our aim was to investigate short-term effects of in vivo ubiquinol (reduced coenzyme Q10[Qred]) supplementation on markers related to inflammation and thrombosis in APS through a prospective, randomized, crossover, placebo-controlled trial...
July 6, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28682809/mechanisms-of-erosion-of-atherosclerotic-plaques
#13
Thibaut Quillard, Grégory Franck, Thomas Mawson, Eduardo Folco, Peter Libby
PURPOSE OF REVIEW: The present review explores the mechanisms of superficial intimal erosion, a common cause of thrombotic complications of atherosclerosis. RECENT FINDINGS: Human coronary artery atheroma that give rise to thrombosis because of erosion differ diametrically from those associated with fibrous cap rupture. Eroded lesions characteristically contain few inflammatory cells, abundant extracellular matrix, and neutrophil extracellular traps (NETs). Innate immune mechanisms such as engagement of Toll-like receptor 2 (TLR2) on cultured endothelial cells can impair their viability, attachment, and ability to recover a wound...
July 5, 2017: Current Opinion in Lipidology
https://www.readbyqxmd.com/read/28681919/il-9-over-expression-and-th9-polarization-in-systemic-sclerosis-patients
#14
Giuliana Guggino, Marianna Lo Pizzo, Diana Di Liberto, Aroldo Rizzo, Paola Cipriani, Piero Ruscitti, Giuseppina Candore, Maria Caterina Gambino, Guido Sireci, Francesco Dieli, Roberto Giacomelli, Giovanni Triolo, Francesco Ciccia
Th9 cells and IL-9 are involved in the pathogenesis of several autoimmune diseases. The exact role of IL-9 and Th9 cells in patients with Systemic Sclerosis (SSc) has not been yet adequately studied. IL-9, IL-9R, transcription factor PU.1 (PU.1), IL-4, thymic stromal lymphopoietin (TSLP) and TGF-β expression were assessed in skin and kidney biopsies of SSc patients and healthy controls (HC) by immunohistochemistry (IHC). The cellular source of IL-9 was also analyzed by confocal microscopy analysis. Peripheral IL-9-producing cells were also studied by flow cytometry...
July 6, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28681585/a-simple-method-for-removing-low-density-granulocytes-to-purify-t-lymphocytes-from-peripheral-blood-mononuclear-cells
#15
Si-Gong Zhang, Yu-Xin Song, Xiao-Ming Shu, Hai-Li Shen, Han-Bo Yang, Rui-Xue Duo, Guo-Chun Wang
OBJECTIVE: Low-density granulocytes (LDGs) can form neutrophil extracellular traps (NETs) spontaneously and excessively. When peripheral blood mononuclear cells (PBMCs) are used for studying T lymphocytes, LDGs contained in the PBMCs may decrease the threshold of activating T lymphocytes by forming NETs. This study focused on the profiles of LDGs in common autoimmune diseases and methods for removing LDGs from PBMCs. METHODS: The percentages of LDGs in PBMCs from 55 patients with dermatomyositis (DM), 15 with polymyositis (PM), 42 with rheumatoid arthritis (RA), 25 with systemic lupus erythematosus (SLE), and 19 healthy controls were determined by flow cytometry...
July 2017: Journal of Zhejiang University. Science. B
https://www.readbyqxmd.com/read/28679606/proteomic-profile-of-cystic-fibrosis-sputum-cells-in-adults-chronically-infected-with-pseudomonas-aeruginosa
#16
Sally H Pattison, David S Gibson, Elinor Johnston, Samantha Peacock, Keith Rivera, Michael M Tunney, Darryl J Pappin, J Stuart Elborn
Lung disease is the main cause of morbidity and mortality in cystic fibrosis (CF), and involves chronic infection and perturbed immune responses. Tissue damage is mediated mostly by extracellular proteases, but other cellular proteins may also contribute to damage through their effect on cell activities and/or release into sputum fluid by means of active secretion or cell death.We employed MudPIT (multidimensional protein identification technology) to identify sputum cellular proteins with consistently altered abundance in adults with CF, chronically infected with Pseudomonas aeruginosa, compared with healthy controls...
July 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28678391/interferon-lambda1-il-29-and-inorganic-polyphosphate-are-novel-regulators-of-neutrophil-driven-thromboinflammation
#17
Akrivi Chrysanthopoulou, Konstantinos Kambas, Dimitrios Stakos, Ioannis Mitroulis, Alexandros Mitsios, Veroniki Vidali, Iliana Angelidou, Magdalena Bochenek, Stella Arelaki, Athanasios Arampatzioglou, Ioanna-Evdokia Galani, Panagiotis Skendros, Elias A Couladouros, Stavros Konstantinides, Evangelos Andreakos, Katrin Schäfer, Konstantinos Ritis
Neutrophils and neutrophil-released meshwork structures termed neutrophil extracellular traps (NETs) are major mediators of thromboinflammation and emerging targets for therapy, yet the mechanisms and pathways that control the role of neutrophils in thromboinflammation remain poorly understood. Here, we explored the role of IFN-λ1/IL-29, a major antiviral cytokine recently shown to suppress the neutrophil migratory capacity, in prothrombotic and proNETotic functions of neutrophils. In an ex vivo human experimental setting of acute ST-segment elevation myocardial infarction (STEMI), we show that IFN-λ1/IL-29 hinders NET release and diminishes the amount of cytoplasmic TF in neutrophils...
July 5, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28678207/in-vitro-testing-of-crude-natural-plant-extracts-from-costa-rica-for-their-ability-to-boost-innate-immune-cells-against-staphylococcus-aureus
#18
Ragheda Yaseen, Katja Branitzki-Heinemann, Hani Moubasher, William N Setzer, Hassan Y Naim, Maren von Köckritz-Blickwede
The increasing occurrence of antibiotic-resistant Staphylococcus (S.) aureus tremendously limits the antibiotic-based treatment options; therefore, an open discussion of alternative treatment strategies is urgently needed. The use of naturally derived materials might become a more promising concept, not only as directly acting antimicrobials, but also for stimulation of the immune system. Costa Rican plant extracts were screened for their ability to enhance the antimicrobial activity of human blood-derived cells against S...
July 5, 2017: Biomedicines
https://www.readbyqxmd.com/read/28676640/human-neutrophils-phagocytose-and-kill-acinetobacter-baumannii-and-a-pittii
#19
María Lázaro-Díez, Itziar Chapartegui-González, Santiago Redondo-Salvo, Chike Leigh, David Merino, David San Segundo, Jesús Navas, José Manuel Icardo, Félix Acosta, Alain Ocampo-Sosa, Luis Martínez-Martínez, José Ramos-Vivas
Acinetobacter baumannii is a common cause of health care associated infections worldwide. A. pittii is an opportunistic pathogen also frequently isolated from Acinetobacter infections other than those from A. baumannii. Knowledge of Acinetobacter virulence factors and their role in pathogenesis is scarce. Also, there are no detailed published reports on the interactions between A. pittii and human phagocytic cells. Using confocal laser and scanning electron microscopy, immunofluorescence, and live-cell imaging, our study shows that immediately after bacteria-cell contact, neutrophils rapidly and continuously engulf and kill bacteria during at least 4 hours of infection in vitro...
July 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28674033/haemophilus-parainfluenzae-strain-atcc33392-forms-biofilms-in-vitro-and-during-experimental-otitis-media-infections
#20
Bing Pang, W Edward Swords
Haemophilus parainfluenzae is a nutritionally fastidious, Gram-negative bacterium with an oropharyngeal/nasopharyngeal carriage niche that is associated with a range of opportunistic infections, which include infectious endocarditis and otitis media (OM). These infections are often chronic/recurrent in nature and typically involve bacterial persistence within biofilm communities that are highly resistant to host clearance. This study addresses the primary hypothesis that H. parainfluenzae forms biofilm communities that are important determinants of persistence in vivo The results from in vitro biofilm studies confirmed that H...
July 3, 2017: Infection and Immunity
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