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https://www.readbyqxmd.com/read/29680657/sirt1-s-nitrosylation-induces-acetylation-of-hmgb1-in-lps-activated-raw264-7-cells-and-endotoxemic-mice
#1
Young Min Kim, Eun Jung Park, Hye Jung Kim, Ki Churl Chang
Excessive inflammation plays a detrimental role in endotoxemia. A recent study indicated that alarmins such as high mobility group box 1 (HMGB1) have drawn attention as therapeutic targets of sepsis. Post-translational modification (i.e., acetylation of lysine residues) of HMGB1 leads to the release of HMGB1 into the cellular space, operating as a warning signal that induces inflammation. Sirtuin 1 (SIRT1) has been shown to negatively regulate HMGB1 hyperacetylation and its extracellular release in sepsis. Therefore, we hypothesized that the S-nitrosylation (SNO) of SIRT1 may disrupt the ability of SIRT1 to negatively regulate the hyperacetylation of HMGB1...
April 19, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29676647/immunologic-effects-of-beryllium-exposure
#2
Andrew P Fontenot
Metal-induced hypersensitivity is driven by T-cell sensitization to metal ions. Although numerous metals are associated with the development of diffuse parenchymal lung disease, beryllium-induced hypersensitivity is the best-studied to date. This review focuses on the interaction between innate and adaptive immunity that leads to the development of chronic beryllium disease. After beryllium exposure, activation of the innate immune system occurs through the engagement of pattern-recognition receptors. This activation leads to cell death, release of alarmins, and activation and migration of dendritic cells to lung-draining lymph nodes...
April 2018: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/29676511/role-of-the-high-mobility-group-box-1-signalling-axes-via-the-receptor-for-advanced-glycation-end-products-and-toll-like-receptor-4-in-the-immunopathology-of-oral-lichen-planus-a-potential-drug-target
#3
Abdelhakim Salem, Rabeia Almahmoudi, Mari Vehviläinen, Tuula Salo
High mobility group box 1 (HMGB1) is an extremely conserved DNA-binding protein that stabilizes nucleosomes and facilitates gene transcription in mammalian cells. When released extracellularly, HMGB1 becomes an alarmin that can mediate systemic diseases. High mobility group box 1 signals via two main receptors: receptor for advanced glycation end-products (RAGE) and toll-like receptor-4 (TLR4). We hypothesized that HMGB1 expression is increased in patients with oral lichen planus (OLP) relative to healthy controls...
April 20, 2018: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29670465/emerging-roles-of-immune-cells-in-postoperative-cognitive-dysfunction
#4
REVIEW
Yue Liu, Yiqing Yin
Postoperative cognitive dysfunction (POCD), a long-lasting cognitive decline after surgery, is currently a major clinical problem with no clear pathophysiological mechanism or effective therapy. Accumulating evidence suggests that neuroinflammation plays a critical role in POCD. After surgery, alarmins are leaked from the injury sites and proinflammatory cytokines are increased in the peripheral circulation. Neurons in the hippocampus, which is responsible for learning and memory, can be damaged by cytokines transmitted to the brain parenchyma...
2018: Mediators of Inflammation
https://www.readbyqxmd.com/read/29670205/alarmin-g-stroke-response-drives-atheroprogression
#5
Gregory B Lim
No abstract text is available yet for this article.
April 18, 2018: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/29643440/bacterial-pore-forming-toxins-promote-the-activation-of-caspases-in-parallel-to-necroptosis-to-enhance-alarmin-release-and-inflammation-during-pneumonia
#6
Norberto Gonzalez-Juarbe, Kelley M Bradley, Ashleigh N Riegler, Luis F Reyes, Terry Brissac, Sang-Sang Park, Marcos I Restrepo, Carlos J Orihuela
Pore-forming toxins are the most common virulence factor in pathogenic bacteria. They lead to membrane permeabilization and cell death. Herein, we show that respiratory epithelial cells (REC) undergoing bacterial pore-forming toxin (PFT)-induced necroptosis simultaneously experienced caspase activation independently of RIPK3. MLKL deficient REC treated with a pan-caspase inhibitor were protected in an additive manner against PFT-induced death. Subsequently, cleaved versions of caspases-2, -4 and -10 were detected within REC undergoing necroptosis by immunoblots and monoclonal antibody staining...
April 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29643068/hydrogen-peroxide-is-a-neuronal-alarmin-that-triggers-specific-rnas-local-translation-of-annexin-a2-and-cytoskeletal-remodeling-in-schwann-cells
#7
Samuele Negro, Marco Stazi, Marta Marchioretto, Toma Tebaldi, Umberto Rodella, Elisa Duregotti, Volker Gerke, Alessandro Quattrone, Cesare Montecucco, Michela Rigoni, Gabriella Viero
Schwann cells are key players in neuro-regeneration: they sense alarm signals released by degenerating nerve terminals and differentiate toward a pro-regenerative phenotype, with phagocytosis of nerve debris and nerve guidance. At the murine neuromuscular junction, hydrogen peroxide (H2 O2 ) is a key signal of Schwann cells activation in response to a variety of nerve injuries. Here we report that Schwann cells exposed to low doses of H2 O2 rewire the expression of several RNAs at both transcriptional and translational levels...
April 11, 2018: RNA
https://www.readbyqxmd.com/read/29623414/ilc2s-in-infectious-diseases-and-organ-specific-fibrosis
#8
REVIEW
Markus Kindermann, Lisa Knipfer, Imke Atreya, Stefan Wirtz
Type 2 immune responses evolved to provide host protection against parasitic infections and to support the repair of infection-induced tissue injury. However, persistent chronic organ damage can result in dysregulated production of critical type 2 cytokines supporting tissue remodeling and fibrosis development. Recently, group 2 innate lymphoid cells (ILC2s) were newly described as central innate mediators of type 2 responses. In particular, by secretion of the cytokines IL-5, IL-9, and IL-13 and the growth factor amphiregulin in response to the release of tissue-derived alarmins, ILC2s have been shown to substantially contribute to both the dismissal of metazoan parasites and the repair of infection-dependent or sterile tissue damage...
March 26, 2018: Seminars in Immunopathology
https://www.readbyqxmd.com/read/29618516/the-proinflammatory-protein-hmgb1-is-a-substrate-of-transglutaminase-2-and-forms-high-molecular-weight-complexes-with-autoantigens
#9
William L Willis, Linan Wang, Takuma Tsuzuki Wada, Mark Gardner, Omar Abdouni, Jeffrey Hampton, Giancarlo Valiente, Nicholas Young, Stacy Ardoin, Sudha Agarwal, Michael A Freitas, Lai-Chu Wu, Wael N Jarjour
High-mobility group box 1 (HMGB1) is a chromatin-associated protein that in response to stress or injury, translocates from the nucleus to the extracellular milieu where it functions as an alarmin. HMGB1's function is in part determined by the complexes (HMGB1c) it forms with other molecules. However, structural modifications in the HMGB1 polypeptide that may regulate HMGB1c formation have not been previously described. In this report, we observed high-molecular weight, denaturing-resistant HMGB1c in the plasma and peripheral blood mononuclear cells of individuals with systemic lupus erythematosus (SLE) and to a much lesser extent in healthy subjects...
April 4, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29616684/allergy-an-alarmin-cut
#10
Lucy Bird
No abstract text is available yet for this article.
April 4, 2018: Nature Reviews. Immunology
https://www.readbyqxmd.com/read/29611822/autoinhibitory-regulation-of-s100a8-s100a9-alarmin-activity-locally-restricts-sterile-inflammation
#11
Thomas Vogl, Athanasios Stratis, Viktor Wixler, Tom Völler, Sumita Thurainayagam, Selina K Jorch, Stefanie Zenker, Alena Dreiling, Deblina Chakraborty, Mareike Fröhling, Peter Paruzel, Corinna Wehmeyer, Sven Hermann, Olympia Papantonopoulou, Christiane Geyer, Karin Loser, Michael Schäfers, Stephan Ludwig, Monika Stoll, Tomas Leanderson, Joachim L Schultze, Simone König, Thomas Pap, Johannes Roth
Autoimmune diseases, such as psoriasis and arthritis, show a patchy distribution of inflammation despite systemic dysregulation of adaptive immunity. Thus, additional tissue-derived signals, such as danger-associated molecular patterns (DAMPs), are indispensable for manifestation of local inflammation. S100A8/S100A9 complexes are the most abundant DAMPs in many autoimmune diseases. However, regulatory mechanisms locally restricting DAMP activities are barely understood. We now unravel for the first time, to our knowledge, a mechanism of autoinhibition in mice and humans restricting S100-DAMP activity to local sites of inflammation...
April 3, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29611537/stroke-an-alarmin-inflammatory-response-after-stroke
#12
Heather Wood
No abstract text is available yet for this article.
April 3, 2018: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/29599894/emerging-players-at-the-intersection-of-chondrocyte-loss-of-maturational-arrest-oxidative-stress-senescence-and-low-grade-inflammation-in-osteoarthritis
#13
REVIEW
Manuela Minguzzi, Silvia Cetrullo, Stefania D'Adamo, Ylenia Silvestri, Flavio Flamigni, Rosa Maria Borzì
The prevalence of Osteoarthritis (OA) is increasing because of the progressive aging and unhealthy lifestyle. These risk factors trigger OA by removing constraints that keep the tightly regulated low turnover of the extracellular matrix (ECM) of articular cartilage, the correct chondrocyte phenotype, and the functionality of major homeostatic mechanisms, such as mitophagy, that allows for the clearance of dysfunctional mitochondria, preventing increased production of reactive oxygen species, oxidative stress, and senescence...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29593748/high-mobility-group-nucleosome-binding-protein-1-as-endogenous-ligand-induces-innate-immune-tolerance-in-a-tlr4-sirtuin-1-dependent-manner-in-human-blood-peripheral-mononuclear-cells
#14
Rob J W Arts, Po-Kai Huang, De Yang, Leo A B Joosten, Jos W M van der Meer, Joost J Oppenheim, Mihai G Netea, Shih-Chin Cheng
High-mobility group nucleosome-binding protein 1 (HMGN1) functions as a non-histone chromatin-binding protein in the cell nucleus. However, extracellular HMGN1 acts as an endogenous danger-associated inflammatory mediator (also called alarmin ). We demonstrated that HMGN1 not only directly stimulated cytokine production but also had the capacity to induce immune tolerance by a TLR4-dependent pathway, similar to lipopolysaccharide (LPS)-induced tolerance. HMGN1-induced tolerance was accompanied by a metabolic shift associated with the inhibition of the induction of Warburg effect (aerobic glycolysis) and histone deacetylation via Sirtuin-1...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29593718/secretion-of-the-phosphorylated-form-of-s100a9-from-neutrophils-is-essential-for-the-proinflammatory-functions-of-extracellular-s100a8-a9
#15
Véronique Schenten, Sébastien Plançon, Nicolas Jung, Justine Hann, Jean-Luc Bueb, Sabrina Bréchard, Eric J Tschirhart, Fabrice Tolle
S100A8 and S100A9 are members of the S100 family of cytoplasmic EF-hand Ca2+ -binding proteins and are abundantly expressed in the cytosol of neutrophils. In addition to their intracellular roles, S100A8/A9 can be secreted in the extracellular environment and are considered as alarmins able to amplify the inflammatory response. The intracellular activity of S100A8/A9 was shown to be regulated by S100A9 phosphorylation, but the importance of this phosphorylation on the extracellular activity of S100A8/A9 has not yet been extensively studied...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29556000/environmental-allergens-induce-allergic-inflammation-through-proteolytic-maturation-of-il-33
#16
Corinne Cayrol, Anais Duval, Pauline Schmitt, Stephane Roga, Mylène Camus, Alexandre Stella, Odile Burlet-Schiltz, Anne Gonzalez-de-Peredo, Jean-Philippe Girard
Allergic inflammation has crucial roles in allergic diseases such as asthma. It is therefore important to understand why and how the immune system responds to allergens. Here we found that full-length interleukin 33 (IL-33FL ), an alarmin cytokine with critical roles in type 2 immunity and asthma, functioned as a protease sensor that detected proteolytic activities associated with various environmental allergens across four kingdoms, including fungi, house dust mites, bacteria and pollens. When exposed to allergen proteases, IL-33FL was rapidly cleaved in its central 'sensor' domain, which led to activation of the production of type 2 cytokines in group 2 innate lymphoid cells...
March 19, 2018: Nature Immunology
https://www.readbyqxmd.com/read/29555931/alarmin-hmgb1-induces-systemic-and-brain-inflammatory-exacerbation-in-post-stroke-infection-rat-model
#17
Il-Doo Kim, Hahnbie Lee, Seung-Woo Kim, Hye-Kyung Lee, Juli Choi, Pyung-Lim Han, Ja-Kyeong Lee
Post-stroke infection (PSI) is known to worsen functional outcomes of stroke patients and accounts to one-third of stroke-related deaths in hospital. In our previous reports, we demonstrated that massive release of high-mobility group box protein 1 (HMGB1), an endogenous danger signal molecule, is promoted by N-methyl-D-aspartic acid-induced acute damage in the postischemic brain, exacerbating neuronal damage by triggering delayed inflammatory processes. Moreover, augmentation of proinflammatory function of lipopolysaccharides (LPS) by HMGB1 via direct interaction has been reported...
March 19, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29551335/expression-and-regulation-of-alarmin-cytokine-il-1%C3%AE-in-human-retinal-pigment-epithelial-cells
#18
Zong-Mei Bian, Matthew G Field, Susan G Elner, Victor M Elner
Human retinal pigment epithelial (hRPE) cells play important immune-regulatory roles in a variety of retinal pathologic processes, including the production of inflammatory cytokines that are essential mediators of the innate immune response within the ocular microenvironment. The pro-inflammatory "alarmin" cytokine IL-1α has been implicated in both infectious and non-infectious retinal diseases, but its regulation in the retina is poorly understood. The purpose of this study was to elucidate the expression and regulation of IL-1α within hRPE cells...
March 15, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29540615/brain-released-alarmins-and-stress-response-synergize-in-accelerating-atherosclerosis-progression-after-stroke
#19
Stefan Roth, Vikramjeet Singh, Steffen Tiedt, Lisa Schindler, Georg Huber, Arie Geerlof, Daniel J Antoine, Antoine Anfray, Cyrille Orset, Maxime Gauberti, Antoine Fournier, Lesca M Holdt, Helena Erlandsson Harris, Britta Engelhardt, Marco E Bianchi, Denis Vivien, Christof Haffner, Jürgen Bernhagen, Martin Dichgans, Arthur Liesz
Stroke induces a multiphasic systemic immune response, but the consequences of this response on atherosclerosis-a major source of recurrent vascular events-have not been thoroughly investigated. We show that stroke exacerbates atheroprogression via alarmin-mediated propagation of vascular inflammation. The prototypic brain-released alarmin high-mobility group box 1 protein induced monocyte and endothelial activation via the receptor for advanced glycation end products (RAGE)-signaling cascade and increased plaque load and vulnerability...
March 14, 2018: Science Translational Medicine
https://www.readbyqxmd.com/read/29530410/high-mobility-group-box-1-protein-hmgb1-operates-as-an-alarmin-outside-as-well-as-inside-cells
#20
REVIEW
Ulf Andersson, Huan Yang, Helena Harris
Alarmins are preformed, endogenous molecules that can be promptly released to signal cell or tissue stress or damage. The ubiquitous nuclear molecule high-mobility group box 1 protein (HMGB1) is a prototypical alarmin activating innate immunity. HMGB1 serves a dual alarmin function. The protein can be emitted to alert adjacent cells about endangered homeostasis of the HMGB1-releasing cell. In addition to this expected path of an alarmin, extracellular HMGB1 can be internalized via RAGE-receptor mediated endocytosis to the endolysosomal compartment while attached to other extracellular proinflammatory molecules...
March 9, 2018: Seminars in Immunology
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