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Extracellular Histones

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https://www.readbyqxmd.com/read/28745733/neutrophil-extracellular-trap-formation-upon-exposure-of-hydrophobic-materials-to-human-whole-blood-causes-thrombogenic-reactions
#1
Claudia Sperling, Marion Fischer, Manfred F Maitz, Carsten Werner
Neutrophil extracellular trap (NET) formation, a reaction of the innate immune system to fight pathogens, was shown to be involved in thrombus formation. In the present study blood-contacting biomaterials with graded surface characteristics were investigated as a potential cause of NET formation on medical devices. Surface properties are known to govern protein adsorption, cell adhesion and ultimately the activation of several other host defense pathways - potentially also the formation of NETs. Model materials of defined hydrophilic or hydrophobic properties (glass, and thin films of poly(ethylene-alt-maleic anhydride), self-assembled monolayers of methyl terminated alkanethiols, and Teflon AF™) were incubated either with isolated human granulocytes after pre-adsorption with plasma proteins or with human whole blood...
July 26, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28717873/orchestration-of-h3k27-methylation-mechanisms-and-therapeutic-implication
#2
REVIEW
Mei-Ren Pan, Ming-Chuan Hsu, Li-Tzong Chen, Wen-Chun Hung
Histone proteins constitute the core component of the nucleosome, the basic unit of chromatin. Chemical modifications of histone proteins affect their interaction with genomic DNA, the accessibility of recognized proteins, and the recruitment of enzymatic complexes to activate or diminish specific transcriptional programs to modulate cellular response to extracellular stimuli or insults. Methylation of histone proteins was demonstrated 50 years ago; however, the biological significance of each methylated residue and the integration between these histone markers are still under intensive investigation...
July 17, 2017: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/28707972/neutralizing-extracellular-histones-in-acute-respiratory-distress-syndrome-a-new-role-for-an-endogenous-pathway
#3
Emma Lefrançais, Mark R Looney
No abstract text is available yet for this article.
July 15, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28696508/neutrophil-extracellular-traps-in-ischemic-stroke-thrombi
#4
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/28696255/regulated-polarization-of-tumor-associated-macrophages-by-mir-145-via-colorectal-cancer-derived-extracellular-vesicles
#5
Haruka Shinohara, Yuki Kuranaga, Minami Kumazaki, Nobuhiko Sugito, Yuki Yoshikawa, Tomoaki Takai, Kohei Taniguchi, Yuko Ito, Yukihiro Akao
Macrophages are polarized into functional classically activated and alternatively activated (M2) phenotypes depending on their microenvironment, and these cells play an important role in the immune system. M2-like polarization of tumor-associated macrophages (TAMs) is activated by various secretions from cancer cells; however, the interaction between cancer cells and TAMs is not well understood. Recent studies showed that cancer cell-derived extracellular vesicles (EVs) contribute to tumor development and modulation of the tumor microenvironment...
July 10, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28694564/hmgb1-and-extracellular-histones-significantly-contribute-to-systemic-inflammation-and-multiple-organ-failure-in-acute-liver-failure
#6
REVIEW
Runkuan Yang, Xiaoping Zou, Jyrki Tenhunen, Tor Inge Tønnessen
Acute liver failure (ALF) is the culmination of severe liver cell injury from a variety of causes. ALF occurs when the extent of hepatocyte death exceeds the hepatic regenerative capacity. ALF has a high mortality that is associated with multiple organ failure (MOF) and sepsis; however, the underlying mechanisms are still not clear. Emerging evidence shows that ALF patients/animals have high concentrations of circulating HMGB1, which can contribute to multiple organ injuries and mediate gut bacterial translocation (BT)...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28676640/human-neutrophils-phagocytose-and-kill-acinetobacter-baumannii-and-a-pittii
#7
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/28669381/role-of-nets-in-the-difference-in-host-susceptibility-to-toxoplasma-gondii-between-sheep-and-cattle
#8
Kader Yildiz, Sami Gokpinar, Aycan Nuriye Gazyagci, Cahit Babur, Neslihan Sursal, Ahmet Kursat Azkur
The main aim of this study was to compare extracellular traps (NETs) formation by polymorphonuclear neutrophils (PMNs) of cattle and sheep when exposed to T. gondii tachyzoites in vitro. The effects of parasite concentrations and different incubation periods on NETs development in cattle and sheep PMNs were studied. The effect of NET structures on host cell invasion by tachyzoites was also studied. This is the first report of NETs development by sheep and cattle PMNs against T. gondii in vitro. T. gondii-induced extracellular DNA production from PMNs was dependent on tachyzoite concentrations and incubation time in both sheep and cattle...
July 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/28663273/correction-for-cassinat-et-al-new-role-for-granulocyte-colony-stimulating-factor-induced-extracellular-signal-regulated-kinase-1-2-in-histone-modification-and-retinoic-acid-receptor-%C3%AE-recruitment-to-gene-promoters-relevance-to-acute-promyelocytic-leukemia-cell
#9
B Cassinat, F Zassadowski, C Ferry, L Llopis, N Bruck, E Lainey, V Duong, A Cras, G Despouy, O Chourbagi, G Beinse, P Fenaux, C Rochette Egly, C Chomienne
No abstract text is available yet for this article.
July 15, 2017: Molecular and Cellular Biology
https://www.readbyqxmd.com/read/28661460/the-novel-hdac8-inhibitor-wk2-16-attenuates-lipopolysaccharide-activated-matrix-metalloproteinase-9-expression-in-human-monocytic-cells-and-improves-hypercytokinemia-in-vivo
#10
Jing-Shiun Jan, Yung-Chen Chou, Yu-Wen Cheng, Chih-Kuang Chen, Wei-Jan Huang, George Hsiao
Dysregulated human monocytes/macrophages can synthesize and secrete matrix metalloproteinases (MMPs), which play important roles in the progression of sepsis. In this study, we investigated the effects and mechanism of a novel histone deacetylase (HDAC8) inhibitor, (E)-N-hydroxy-4-methoxy-2-(biphenyl-4-yl)cinnamide (WK2-16), on MMP-9 production and activation in stimulated human monocytic THP-1 cells. Our results demonstrated that the acetylation level of structural maintenance of chromosomes 3 (SMC3) was up-regulated by WK2-16 in THP-1 cells...
June 29, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28659928/gestational-diabetes-mellitus-is-associated-with-altered-neutrophil-activity
#11
Maria Stoikou, Franco Grimolizzi, Stavros Giaglis, Günther Schäfer, Shane Vontelin van Breda, Irene Mathilde Hoesli, Olav Lapaire, Evelyn A Huhn, Paul Hasler, Simona W Rossi, Sinuhe Hahn
Gestational diabetes mellitus (GDM) is a unique form of glucose intolerance, in that it is transient and solely occurs in pregnancy. Pregnancies with GDM are at high risk of developing preeclampsia (PE), a leading cause of fetal and maternal morbidity or mortality. Since PE is associated with excessive activation of circulatory neutrophils and occurrence of neutrophil extracellular traps (NETs) in affected placentae, we examined these features in cases with GDM, as this could be a feature linking the two conditions...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28657371/hmgb1-is-a-promising-therapeutic-target-for-acute-liver-failure
#12
Tetsu Yamamoto, Yoshitsugu Tajima
Although acute liver failure (ALF) is a rare disease, it continues to have high mortality and morbidity rates due to its many causes. High mobility group box 1 (HMGB1), originally reported as a ubiquitous non-histone chromosomal protein, is a multi-functional protein with varying functions depending on its location, such as in the nucleus, cytoplasm and extracellular space. The role of extracellular HMGB1 as an inflammatory mediator has been well studied, and the elevation of serum HMGB1 has been reported in several diseases that are closely associated with ALF...
July 2017: Expert Review of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28643239/serum-histones-as-biomarkers-of-the-severity-of-heatstroke-in-dogs
#13
Yaron Bruchim, Isaac Ginsburg, Gilad Segev, Ahmad Mreisat, Yochai Avital, Itamar Aroch, Michal Horowitz
Heatstroke is associated with systemic inflammatory response syndrome, leading to multiple organ dysfunction and death. Currently, there is no specific treatment decreasing hyperthermia-induced inflammatory/hemostatic derangements. Emerging studies indicate that histones leaking from damaged cells into the extracellular space are toxic, pro-inflammatory, and pro-thrombotic. We therefore hypothesize that serum histones (sHs) are elevated during heatstroke and are associated with the severity of the disease. Sixteen dogs with heatstroke and seven healthy controls were included in the study...
June 22, 2017: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/28640691/the-nesprin-cytoskeleton-interface-probed-directly-on-single-nuclei-is-a-mechanically-rich-system
#14
Daniel A Balikov, Sonia K Brady, Ung Hyun Ko, Jennifer H Shin, Jose M de Pereda, Arnoud Sonnenberg, Hak-Joon Sung, Matthew J Lang
The cytoskeleton provides structure and plays an important role in cellular function such as migration, resisting compression forces, and transport. The cytoskeleton also reacts to physical cues such as fluid shear stress or extracellular matrix remodeling by reorganizing filament associations, most commonly focal adhesions and cell-cell cadherin junctions. These mechanical stimuli can result in genome-level changes, and the physical connection of the cytoskeleton to the nucleus provides an optimal conduit for signal transduction by interfacing with nuclear envelope proteins, called nesprins, within the LINC (linker of the nucleus to the cytoskeleton) complex...
June 22, 2017: Nucleus
https://www.readbyqxmd.com/read/28636597/phase-separation-drives-heterochromatin-domain-formation
#15
Amy R Strom, Alexander V Emelyanov, Mustafa Mir, Dmitry V Fyodorov, Xavier Darzacq, Gary H Karpen
Constitutive heterochromatin is an important component of eukaryotic genomes that has essential roles in nuclear architecture, DNA repair and genome stability, and silencing of transposon and gene expression. Heterochromatin is highly enriched for repetitive sequences, and is defined epigenetically by methylation of histone H3 at lysine 9 and recruitment of its binding partner heterochromatin protein 1 (HP1). A prevalent view of heterochromatic silencing is that these and associated factors lead to chromatin compaction, resulting in steric exclusion of regulatory proteins such as RNA polymerase from the underlying DNA...
July 13, 2017: Nature
https://www.readbyqxmd.com/read/28627340/-experimental-study-on-formation-of-neutrophil-extracellular-traps-in-human-peripheral-blood-induced-by-paraquat-in-vitro
#16
Wei Jin, Jian Lu, Hui Xie, Yiqun Jiang, Xiaoxiao Meng, Yong Zhu, Ruilan Wang
OBJECTIVE: To explore whether paraquat (PQ) can induce the formation of neutrophil extracellular traps (NETs) in human peripheral blood. METHODS: Neutrophils were isolated from healthy human peripheral blood, and the cells were identified by hematoxylin-eosin (HE) strain. The cells were treated with different concentrations of PQ [0 (as control), 200, 400, 600, 800, 1 000 and 1 200 μmol/L], and the cell viability was measured by cell proliferation and CCK-8 cytotoxicity detection kit, and the median lethal concentration of PQ was selected...
March 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28615512/hdac10-promotes-angiogenesis-in-endothelial-cells-through-the-ptpn22-erk-axis
#17
Baoyu Duan, Dan Ye, Songcheng Zhu, Wenwen Jia, Chenqi Lu, Guiying Wang, Xudong Guo, Yangyang Yu, Chuanyue Wu, Jiuhong Kang
Angiogenesis is crucially involved in many physiological and pathological processes including tumor growth, but the molecular mechanisms regulating angiogenesis are incompletely understood. In this study, we investigated the functions and mechanism of histone deacetylase 10 (HDAC10), a member of the HDAC II family, in regulation of angiogenesis. HDAC10 overexpression in human umbilical vein endothelial cells (HUVECs) promoted tube formation, whereas depletion of HDAC10 from HUVECs inhibited tube formation in vitro and in vivo...
May 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/28612091/intracellular-vorinostat-accumulation-and-its-relationship-to-histone-deacetylase-activity-in-soft-tissue-sarcoma-patients
#18
Jürgen Burhenne, Lu Liu, Christoph E Heilig, Andreas D Meid, Margarete Leisen, Thomas Schmitt, Bernd Kasper, Walter E Haefeli, Gerd Mikus, Gerlinde Egerer
PURPOSE: In the regulation of chromatin-structure and histone function, histone deacetylases (HDACs) are key enzymes and thus modulators of epigenetic regulation and gene expression. Accesses of the HDAC inhibitor vorinostat to intracellular compartments are essential to exert epigenetic effects. METHODS: In ten sarcoma patients receiving oral Zolinza (400 mg qd) vorinostat concentrations in plasma and peripheral blood mononuclear cells (PBMCs) were quantified using validated LC/MS/MS assays to determine intracellular and extracellular pharmacokinetic data...
June 13, 2017: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/28611772/bovine-polymorphonuclear-neutrophils-cast-neutrophil-extracellular-traps-against-the-abortive-parasite-neospora-caninum
#19
Rodolfo Villagra-Blanco, Liliana M R Silva, Tamara Muñoz-Caro, Zhengtao Yang, Jianhua Li, Ulrich Gärtner, Anja Taubert, Xichen Zhang, Carlos Hermosilla
Neospora caninum represents a relevant apicomplexan parasite causing severe reproductive disorders in cattle worldwide. Neutrophil extracellular trap (NET) generation was recently described as an efficient defense mechanism of polymorphonuclear neutrophils (PMN) acting against different parasites. In vitro interactions of bovine PMN with N. caninum were analyzed at different ratios and time spans. Extracellular DNA staining was used to illustrate the typical molecules of NETs [i.e., histones (H3), neutrophil elastase (NE), myeloperoxidase (MPO), pentraxin] via antibody-based immunofluorescence analyses...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28603210/emerging-mechanisms-underlying-astrogenesis-in-the-developing-mammalian-brain
#20
REVIEW
Jun Takouda, Sayako Katada, Kinichi Nakashima
In the developing brain, the three major cell types, i.e., neurons, astrocytes and oligodendrocytes, are generated from common multipotent neural stem cells (NSCs). In particular, astrocytes eventually occupy a great fraction of the brain and play pivotal roles in the brain development and functions. However, NSCs cannot produce the three major cell types simultaneously from the beginning; e.g., it is known that neurogenesis precedes astrogenesis during brain development. How is this fate switching achieved? Many studies have revealed that extracellular cues and intracellular programs are involved in the transition of NSC fate specification...
2017: Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
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