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Extracellular Traps

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https://www.readbyqxmd.com/read/28337204/phenol-soluble-modulin-%C3%AE-peptide-toxins-from-aggressive-staphylococcus-aureus-induce-rapid-formation-of-neutrophil-extracellular-traps-through-a-reactive-oxygen-species-independent-pathway
#1
Halla Björnsdottir, Agnes Dahlstrand Rudin, Felix P Klose, Jonas Elmwall, Amanda Welin, Marios Stylianou, Karin Christenson, Constantin F Urban, Huamei Forsman, Claes Dahlgren, Anna Karlsson, Johan Bylund
Neutrophils have the ability to capture and kill microbes extracellularly through the formation of neutrophil extracellular traps (NETs). These are DNA and protein structures that neutrophils release extracellularly and are believed to function as a defense mechanism against microbes. The classic NET formation process, triggered by, e.g., bacteria, fungi, or by direct stimulation of protein kinase C through phorbol myristate acetate, is an active process that takes several hours and relies on the production of reactive oxygen species (ROS) that are further modified by myeloperoxidase (MPO)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28336490/novel-therapeutic-interventions-for-pseudoachondroplasia
#2
Karen L Posey, Jacqueline T Hecht
Pseudoachondroplasia (PSACH), a severe short-limbed dwarfing condition, is associated with life-long joint pain and early onset osteoarthritis. PSACH is caused by mutations in cartilage oligomeric matrix protein (COMP), a pentameric matricellular protein expressed primarily in cartilage and other musculoskeletal tissues. Mutations in COMP diminish calcium binding and as a result perturb protein folding and export to the extracellular matrix. Mutant COMP is retained in the endoplasmic reticulum (ER) of growth plate chondrocytes resulting in massive intracellular COMP retention...
March 21, 2017: Bone
https://www.readbyqxmd.com/read/28323850/ligand-guided-homology-modelling-of-the-gabab2-subunit-of-the-gabab-receptor
#3
Thibaud Freyd, Dawid Warszycki, Stefan Mordalski, Andrzej J Bojarski, Ingebrigt Sylte, Mari Gabrielsen
γ-aminobutyric acid (GABA) is the main inhibitory neurotransmitter in the central nervous system, and disturbances in the GABAergic system have been implicated in numerous neurological and neuropsychiatric diseases. The GABAB receptor is a heterodimeric class C G protein-coupled receptor (GPCR) consisting of GABAB1a/b and GABAB2 subunits. Two GABAB receptor ligand binding sites have been described, namely the orthosteric GABA binding site located in the extracellular GABAB1 Venus fly trap domain and the allosteric binding site found in the GABAB2 transmembrane domain...
2017: PloS One
https://www.readbyqxmd.com/read/28303858/role-of-neutrophil-extracellular-traps-in-asthma-and-chronic-obstructive-pulmonary-disease
#4
REVIEW
Ting Liu, Fa-Ping Wang, Geng Wang, Hui Mao
OBJECTIVE: Asthma and chronic obstructive pulmonary disease (COPD) are representative chronic inflammatory airway diseases responsible for a considerable burden of disease. In this article, we reviewed the relationship between neutrophil extracellular traps (NETs) and chronic inflammatory airway diseases. DATA SOURCES: Articles published up to January 1, 2017, were selected from the PubMed, Ovid Medline, Embase databases, with the keywords of "asthma" or "pulmonary disease, chronic obstructive", "neutrophils" and "extracellular traps...
March 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28303318/bone-alkaline-phosphatase-and-tartrate-resistant-acid-phosphatase-potential-co-regulators-of-bone-mineralization
#5
Cecilia Halling Linder, Barbro Ek-Rylander, Michael Krumpel, Maria Norgård, Sonoko Narisawa, José Luis Millán, Göran Andersson, Per Magnusson
Phosphorylated osteopontin (OPN) inhibits hydroxyapatite crystal formation and growth, and bone alkaline phosphatase (BALP) promotes extracellular mineralization via the release of inorganic phosphate from the mineralization inhibitor inorganic pyrophosphate (PPi). Tartrate-resistant acid phosphatase (TRAP), produced by osteoclasts, osteoblasts, and osteocytes, exhibits potent phosphatase activity towards OPN; however, its potential capacity as a regulator of mineralization has not previously been addressed...
March 16, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28303140/netosis-in-alzheimer-s-disease
#6
REVIEW
Enrica Caterina Pietronigro, Vittorina Della Bianca, Elena Zenaro, Gabriela Constantin
Alzheimer's disease (AD) is a neurodegenerative disorder characterized by the progressive deterioration of cognitive functions. Its neuropathological features include amyloid-β (Aβ) accumulation, the formation of neurofibrillary tangles, and the loss of neurons and synapses. Neuroinflammation is a well-established feature of AD pathogenesis, and a better understanding of its mechanisms could facilitate the development of new therapeutic approaches. Recent studies in transgenic mouse models of AD have shown that neutrophils adhere to blood vessels and migrate inside the parenchyma...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28299345/neutrophils-and-immunity-from-bactericidal-action-to-being-conquered
#7
REVIEW
Tie-Shan Teng, Ai-Ling Ji, Xin-Ying Ji, Yan-Zhang Li
The neutrophil is the major phagocyte and the final effector cell of the innate immunity, with a primary role in the clearance of extracellular pathogens. Using the broad array of cytokines, extracellular traps, and effector molecules as the humoral arm, neutrophils play a crucial role in the host defense against pathogen infections. On the other hand, the pathogen has the capacity to overcome neutrophil-mediated host defense to establish infection causing human disease. Pathogens, such as S. aureus, have the potential to thwart neutrophil chemotaxis and phagocytosis and thereby succeed in evading killing by neutrophils...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28298094/fcs-experiments-to-quantify-ca-2-diffusion-and-its-interaction-with-buffers
#8
Lorena Sigaut, Cecilia Villarruel, Silvina Ponce Dawson
Ca(2+) signals are ubiquitous. One of the key factors for their versatility is the variety of spatio-temporal distributions that the cytosolic Ca(2+) can display. In most cell types Ca(2+) signals not only depend on Ca(2+) entry from the extracellular medium but also on Ca(2+) release from internal stores, a process which is in turn regulated by cytosolic Ca(2+) itself. The rate at which Ca(2+) is transported, the fraction that is trapped by intracellular buffers, and with what kinetics are thus key features that affect the time and spatial range of action of Ca(2+) signals...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28295872/cellular-crosstalk-inflammatory-signals-and-enhanced-microvascular-permeability
#9
Jerome W Breslin
Microvascular leakage remains a significant clinical problem for which there is no specific therapeutic available. This Special Topics issue of the journal Microcirculation features reviews pertaining to the cellular and molecular mechanisms that control the integrity of the microvascular barrier. Meegan et al [1] summarize recent research findings about how neutrophil extracellular traps and how these can cause injury to the microvascular barrier. Zhang et al [2] highlight the microvascular response to advanced glycation end products that are formed as part of the pathophysiology of diabetes mellitus...
March 14, 2017: Microcirculation: the Official Journal of the Microcirculatory Society, Inc
https://www.readbyqxmd.com/read/28295836/profiling-n-glycans-of-the-egg-jelly-coat-of-the-sea-urchin-paracentrotus-lividus-by-maldi-tof-mass-spectrometry-and-capillary-liquid-chromatography-electrospray-ionization-ion-trap-tandem-mass-spectrometry-systems
#10
Umut Şahar, Remziye Deveci
Sea urchin eggs are surrounded by a carbohydrate-rich layer, termed the jelly coat, that consists of polysaccharides and glycoproteins. In the present study, we describe two mass spectrometric strategies to characterize the N-glycosylation of the Paracentrotus lividus egg jelly coat, which has an alecithal-type extracellular matrix like mammalian eggs. Egg jelly was isolated, lyophilized, and dialysed, followed by peptide N-glycosidase F (PNGase-F) treatment to release N-glycans from their protein chain. These N-glycans were then derivatized by permethylation reaction, and analysed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and capillary liquid chromatography electrospray ionization-ion trap tandem mass spectroscopy (CapLC ESI-Ion trap-MS/MS)...
March 10, 2017: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/28295679/guiding-brain-tumor-surgery-via-blood-brain-barrier-permeable-gold-nanoprobes-with-acid-triggered-mri-serrs-signals
#11
Xihui Gao, Qi Yue, Zining Liu, Mengjing Ke, Xingyu Zhou, Sihan Li, Jianping Zhang, Ren Zhang, Liang Chen, Ying Mao, Cong Li
Surgical resection is a mainstay in the treatment of malignant brain tumors. Surgeons, however, face great challenges in distinguishing tumor margins due to their infiltrated nature. Here, a pair of gold nanoprobes that enter a brain tumor by crossing the blood-brain barrier is developed. The acidic tumor environment triggers their assembly with the concomitant activation of both magnetic resonance (MR) and surface-enhanced resonance Raman spectroscopy (SERRS) signals. While the bulky aggregates continuously trap into the tumor interstitium, the intact nanoprobes in normal brain tissue can be transported back into the blood stream in a timely manner...
March 15, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28293240/extracellular-acidification-inhibits-the-ros-dependent-formation-of-neutrophil-extracellular-traps
#12
Martina Behnen, Sonja Möller, Antonia Brozek, Matthias Klinger, Tamás Laskay
The inflammatory microenvironment is commonly characterized by extracellular acidosis (pH < 7.35). Sensitivity to pH, CO2 or bicarbonate concentrations allows neutrophils to react to changes in their environment and to detect inflamed areas in the tissue. One important antimicrobial effector mechanism is the production of neutrophil extracellular traps (NETs), which are released during a programmed reactive oxygen species (ROS)-dependent cell death, the so-called NETosis. Although several functions of neutrophils have been analyzed under acidic conditions, the effect of extracellular acidosis on NETosis remains mainly unexplored and the available experimental results are contradictory...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28282434/resistance-of-hypervirulent-klebsiella-pneumoniae-to-both-intracellular-and-extracellular-killing-of-neutrophils
#13
Lifeng Wang, Dingxia Shen, Hua Wu, Yanning Ma
Hypervirulent Klebsiella pneumoniae (HvKP) is hypermucoviscous organism, carrying genes of rmpA and aerobactin, causing serious community-acquired infection and metastatically spread in young healthy hosts. Neutrophils play an important role during innate immune response against bacterial infection by phagocytosis and neutrophil extracellular traps (NETs). Whether neutrophils can effectively defend against HvKP remains unclear. In this study, we observed that the HvKP was significantly more resistant to neutrophil-mediated phagocytosis and intracellular killing than classic Klebsiella pneumoniae (cKP) isolates...
2017: PloS One
https://www.readbyqxmd.com/read/28281454/immune-stimulatory-effects-of-neutrophil-extracellular-traps-in-granulomatosis-with-polyangiitis
#14
Christina Lange, Elena Csernok, Frank Moosig, Julia U Holle
OBJECTIVES: The aim of this study was to analyse the role of netting neutrophils in the pathogenesis of granulomatosis with polyangiitis (GPA), especially their interplay with peripheral blood mononuclear cells (PBMCs). METHODS: The amount of cell-free DNA (cfDNA) was determined in sera from GPA patients (pairs active/inactive state of disease, n=18) and from healthy controls (HCs, n=10). Furthermore, we performed in vitro incubation experiments using PBMCs and NETs from patients and HCs for accessing the effect of NETs on PBMC behaviour...
March 8, 2017: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/28280716/aflatoxin-b1-induces-reactive-oxygen-species-mediated-autophagy-and-extracellular-trap-formation-in-macrophages
#15
Yanan An, Xiaochen Shi, Xudong Tang, Yang Wang, Fengge Shen, Qiaoli Zhang, Chao Wang, Mingguo Jiang, Mingyuan Liu, Lu Yu
Aflatoxins are a group of highly toxic mycotoxins with high carcinogenicity that are commonly found in foods. Aflatoxin B1 (AFB1) is the most toxic member of the aflatoxin family. A recent study reported that AFB1 can induce autophagy, but whether AFB1 can induce extracellular traps (ETs) and the relationships among innate immune responses, reactive oxygen species (ROS), and autophagy and the ETs induced by AFB1 remain unknown. Here, we demonstrated that AFB1 induced a complete autophagic process in macrophages (MΦ) (THP-1 cells and RAW264...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28279797/convection-enhanced-delivery-of-cisplatin-loaded-brain-penetrating-nanoparticles-cures-malignant-glioma-in-rats
#16
Clark Zhang, Elizabeth A Nance, Panagiotis Mastorakos, Jane Chisholm, Sneha Berry, Charles Eberhart, Betty Tyler, Henry Brem, Jung Soo Suk, Justin Hanes
Glioblastoma multiforme (GBM) is highly invasive and uniformly fatal, with median survival<20months after diagnosis even with the most aggressive treatment that includes surgery, radiation, and systemic chemotherapy. Cisplatin is a particularly potent chemotherapeutic agent, but its use to treat GBM is limited by severe systemic toxicity and inefficient penetration of brain tumor tissue even when it is placed directly in the brain within standard delivery systems. We describe the development of cisplatin-loaded nanoparticles that are small enough (70nm in diameter) to move within the porous extracellular matrix between cells and that possess a dense polyethylene glycol (PEG) corona that prevents them from being trapped by adhesion as they move through the brain tumor parenchyma...
March 7, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28272695/the-glucocorticoid-inhibits-neutrophils-formed-extracellular-traps-nets-and-suppresses-the-inflammation-caused-by-fallopian-tube-staphylococcal-infection
#17
S-X Luan, X-H Chen
OBJECTIVE: Fallopian tube can transport zygote into the uterine cavity, while inflammation may cause certain influences on the fallopian tube's function. Neutrophils formed extracellular traps (NET) can kill pathogenic microorganisms. This study intends to analyze the role of glucocorticoid in the regulation of NETs sterilization during the fallopian tube staphylococcal infection. MATERIALS AND METHODS: Rat fallopian tube staphylococcal infection model was established...
February 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28267716/an-emerging-role-for-neutrophil-extracellular-traps-in-noninfectious-disease
#18
REVIEW
Selina K Jorch, Paul Kubes
The production of neutrophil extracellular traps (NETs) is a process that enables neutrophils to help catch and kill bacteria. However, increasing evidence suggests that this process might also occur in noninfectious, sterile inflammation. In this Review, we describe the role of NETosis in autoimmunity, coagulation, acute injuries and cancer, and discuss NETs as potential therapeutic targets. Furthermore, we consider whether extracellular DNA is always detrimental in sterile inflammation and whether the source is always NETs...
March 7, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28266266/family-b-g-protein-coupled-receptors-and-their-ligands-from-structure-to-function
#19
Thomas Mavromoustakos, Maria Venihaki, Vlasios Karageorgos, Minos-Timotheos Matsoukas, George Liapakis
Family B G protein-coupled receptors (GPCRs) belong to the superfamily of GPCRs and play an important role in many physiological and pathophysiological processes. Previous studies revealed the importance of ligands for family B GPCRs as drug targets, thus demonstrating the need for the development of novel ligands with improved pharmacodynamic and pharmacokinetic profiles. A major contribution to the development of novel drugs is the knowledge of the structure and function of their targets. Family B receptors are plasma membrane proteins containing an extracellular N-domain, an intracellular C-tail, seven transmembrane domains (TMs), which are connected to each other with three extracellular (ELs) and three intracellular (ILs) loops...
March 3, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/28259010/effects-of-fructose-induced-metabolic-syndrome-on-rat-skeletal-cells-and-tissue-and-their-responses-to-metformin-treatment
#20
Juan Ignacio Felice, León Schurman, Antonio Desmond McCarthy, Claudia Sedlinsky, José Ignacio Aguirre, Ana María Cortizo
AIMS: Deleterious effects of metabolic syndrome (MS) on bone are still controversial. In this study we evaluated the effects of a fructose-induced MS, and/or an oral treatment with metformin on the osteogenic potential of bone marrow mesenchymal stromal cells (MSC), as well as on bone formation and architecture. METHODS: 32 male 8week-old Wistar rats were assigned to four groups: control (C), control plus oral metformin (CM), rats receiving 10% fructose in drinking water (FRD), and FRD plus metformin (FRDM)...
February 14, 2017: Diabetes Research and Clinical Practice
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