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Phagocytic activity of neutrophils

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https://www.readbyqxmd.com/read/29454792/clinical-and-genomic-correlates-of-neutrophil-reactive-oxygen-species-production-in-pediatric-patients-with-crohn-s-disease
#1
Lee A Denson, Ingrid Jurickova, Rebekah Karns, Kelly A Shaw, David J Cutler, David Okou, Anne Dodd, Kathryn Quinn, Kajari Mondal, Bruce J Aronow, Yael Haberman, Aaron Linn, Adam Price, Ramona Bezold, Kathleen Lake, Kimberly Jackson, Thomas D Walters, Anne Griffiths, Robert N Baldassano, Joshua D Noe, Jeffrey S Hyams, Wallace V Crandall, Barbara S Kirschner, Melvin B Heyman, Scott Snapper, Stephen L Guthery, Marla C Dubinsky, Neal S Leleiko, Anthony R Otley, Ramnik J Xavier, Christine Stevens, Mark J Daly, Michael E Zwick, Subra Kugathasan
BACKGROUND & AIMS: Individuals with monogenic disorders of phagocyte function develop chronic colitis that resembles Crohn's Disease (CD). We tested for associations between mutations in genes encoding NADPH oxidases, neutrophil function, and phenotypes of CD in pediatric patients. METHODS: We performed whole-exome sequence analysis to identify mutations in genes encoding NADPH oxidases (such as CYBA, CYBB, NCF1, NCF2, NCF4, RAC1, and RAC2) using DNA from 543 pediatric patients with inflammatory bowel diseases...
February 15, 2018: Gastroenterology
https://www.readbyqxmd.com/read/29444433/microrna-223-suppresses-the-canonical-nf-%C3%AE%C2%BAb-pathway-in-basal-keratinocytes-to-dampen-neutrophilic-inflammation
#2
Wenqing Zhou, Arpita S Pal, Alan Yi-Hui Hsu, Theodore Gurol, Xiaoguang Zhu, Sara E Wirbisky-Hershberger, Jennifer L Freeman, Andrea L Kasinski, Qing Deng
MicroRNA-223 is known as a myeloid-enriched anti-inflammatory microRNA that is dysregulated in numerous inflammatory conditions. Here, we report that neutrophilic inflammation (wound response) is augmented in miR-223-deficient zebrafish, due primarily to elevated activation of the canonical nuclear factor κB (NF-κB) pathway. NF-κB over-activation is restricted to the basal layer of the surface epithelium, although miR-223 is detected throughout the epithelium and in phagocytes. Not only phagocytes but also epithelial cells are involved in miR-223-mediated regulation of neutrophils' wound response and NF-κB activation...
February 13, 2018: Cell Reports
https://www.readbyqxmd.com/read/29438774/palliative-effects-of-moringa-olifera-ethanolic-extract-on-hemato-immunologic-impacts-of-melamine-in-rats
#3
Yasmina M Abd-Elhakim, Khlood M El Bohi, Sahar Khalifa Hassan, Shorouk El Sayed, Sabry M Abd-Elmotal
Melamine (MEL) is a widespread food contaminant and adulterant. Moringa olifera is a widely known medicinal plant with various pharmacological properties. Herein, this study aimed to investigate, for the first time, the probable protective or therapeutic role of M. olifera ethanolic extract (MOE) against MEL induced hemato-immune toxic hazards. Fifty Sprague Dawely male rats were orally treated with distilled water, MOE (800 mg/kg bw), MEL (700 mg/kg bw), MOE/MEl or MOE + MEl. Erythrogram and leukogram profiling were evaluated to assess hematological status...
February 10, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29431689/dysregulated-th1-immune-and-vascular-responses-in-scrub-typhus-pathogenesis
#4
REVIEW
Lynn Soong
Scrub typhus is an emerging, insect-transmitted disease caused by Orientia tsutsugamushi, a Gram- and LPS-negative bacterium that replicates freely within professional phagocytes and endothelial cells. Scrub typhus is prevalent with high mortality rates, but information regarding its molecular pathogenesis, microbial virulence determinants, and key immune responses is limited. Improved animal models have recently been developed that respectively resemble the pathological features of self-limiting or severe scrub typhus in humans...
February 15, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29421977/chronic-alterations-in-systemic-immune-function-after-traumatic-brain-injury
#5
Rodney Ritzel, Sarah Doran, James Barrett, Rebecca Henry, Elise Ma, Alan Faden, David J Loane
There is a compelling link between severe brain trauma and immunosuppression in traumatic brain injury (TBI) patients. Although acute changes in the systemic immune compartment have been linked to outcome severity, the long-term consequences of TBI on systemic immune function is unknown. Here, adult male C57Bl/6 mice were subjected to moderate-level controlled cortical impact (CCI) or sham surgery and systemic immune function was evaluated at 1, 3, 7, 14, and 60 days post-injury. Bone marrow, blood, thymus, and spleen were examined by flow cytometry to assess changes in immune composition, reactive oxygen species (ROS) production, phagocytic activity, and cytokine production...
February 8, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29394241/chlorinated-lipids-elicit-inflammatory-responses-in-vitro-and-in-vivo
#6
Hong Yu, Meifang Wang, Derek Wang, Theodore J Kalogeris, Jane McHowat, David A Ford, Ronald J Korthuis
Increased endothelial cell adhesion molecule (ECAM) expression, leukocyte-endothelial cell adhesive interactions (LECA), platelet-endothelial cell adhesion (PECA), mast cell activation, production of reactive oxygen species (ROS), and microvascular permeability are hallmarks of the inflammatory response. The infiltration of inflammatory phagocytes is associated with myeloperoxidase (MPO)-dependent production of hypochlorous acid (HOCl), a reactive chlorinating species (RCS) that targets membrane lipids to produce halogenated lipids such as 2-chlorohexadecanal (2-ClHDA) and 2-chloropalmitic acid (2-ClPA)...
February 1, 2018: Shock
https://www.readbyqxmd.com/read/29383154/an-ultrastructural-investigation-of-tumors-undergoing-regression-mediated-by-immunotherapy
#7
Jennifer A Westwood, Sarah Ellis, Jill Danne, Chad Johnson, Viola Oorschot, Georg Ramm, David C Tscharke, Alexander J Davenport, James C Whisstock, Phillip K Darcy, Michael H Kershaw, Clare Y Slaney
While immunotherapy employing chimeric antigen receptor (CAR) T cells can be effective against a variety of tumor types, little is known about what happens within the tumor at an ultrastructural level during tumor regression. Here, we used transmission electron microscopy to investigate morphologic and cellular features of tumors responding to immunotherapy composed of adoptive transfer of dual-specific CAR T cells and a vaccine, supported by preconditioning irradiation and interleukin-2. Tumors responded rapidly, and large areas of cell death were apparent by 4 days after treatment...
December 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/29380901/the-influence-of-agents-differentiating-hl-60-cells-toward-granulocyte-like-cells-on-their-ability-to-release-neutrophil-extracellular-traps
#8
Aneta Manda-Handzlik, Weronika Bystrzycka, Małgorzata Wachowska, Sandra Sieczkowska, Anna Stelmaszczyk-Emmel, Urszula Demkow, Olga Ciepiela
Studies on neutrophil extracellular traps (NETs) are challenging as neutrophils live shortly and easily become activated. Thus, availability of a cell line model closely resembling the functions of peripheral blood neutrophils would be advantageous. Our purpose was to find a compound that most effectively differentiates HL-60 (human promyelocytic leukemia) cells toward granulocyte-like cells able to release NETs. HL-60 cells were differentiated with all-trans retinoic acid (ATRA), dimethyl sulfoxide (DMSO) or dimethylformamide (DMF) and stimulated with phorbol 12-myristate 13-acetate (PMA) or calcium ionophore A23187 (CI)...
January 30, 2018: Immunology and Cell Biology
https://www.readbyqxmd.com/read/29371565/innate-and-adaptive-immunity-to-mucorales
#9
REVIEW
Harlene Ghuman, Kerstin Voelz
Mucormycosis is an invasive fungal infection characterised by rapid filamentous growth, which leads to angioinvasion, thrombosis, and tissue necrosis. The high mortality rates (50-100%) associated with mucormycosis are reflective of not only the aggressive nature of the infection and the poor therapeutics currently employed, but also the failure of the human immune system to successfully clear the infection. Immune effector interaction with Mucorales is influenced by the developmental stage of the mucormycete spore...
September 5, 2017: Journal of Fungi (Basel, Switzerland)
https://www.readbyqxmd.com/read/29337420/a-proinflammatory-response-of-bovine-endometrial-epithelial-cells-to-active-sperm-in-vitro
#10
Ahmed Essam Elweza, Mohamed Aboul Ezz, Tomas J Acosta, Anup K Talukder, Takashi Shimizu, Hiroyuki Hayakawa, Masayuki Shimada, Kazuhiko Imakawa, Ahmed Hamed Zaghloul, Akio Miyamoto
In the cow, cryopreserved semen is inseminated into the uterus, and most of sperm are removed by backflow and phagocytes. Nevertheless, the mechanism responsible for sperm phagocytosis is unclear. Here, we used cultured bovine uterine epithelial cells (BUECs) to investigate the uterine response to sperm and the mechanism that activates polymorphonuclear neutrophils (PMNs). BUEC monolayers were co-cultured with different numbers of washed sperm obtained from cryopreserved semen (104 , 105 and 106 sperm/ml) for 3 h...
January 16, 2018: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/29247123/taurine-chloramine-potentiates-phagocytic-activity-of-peritoneal-macrophages-through-up-regulation-of-dectin-1-mediated-by-heme-oxygenase-1-derived-carbon-monoxide
#11
Seung Hyeon Kim, Xiancai Zhong, Wonki Kim, Kyeojin Kim, Young-Ger Suh, Chaekyun Kim, Yeonsoo Joe, Hun Taeg Chung, Young-Nam Cha, Young-Joon Surh
Resolution of inflammation that occurs after microbial infection or tissue damage is an important physiologic process in maintaining or restoring host homeostasis. Taurine chloramine (TauCl) is formed by a reaction between taurine and hypochlorite in leukocytes, and it is especially abundant in activated neutrophils that encounter an oxidative burst. As neutrophils undergo apoptosis, TauCl is released to the extracellular matrix at the inflamed sites, thereby affecting coexisting macrophages in the inflammatory microenvironment...
December 15, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29238967/potent-anti-inflammatory-and-pro-resolving-effects-of-anabasum-in-a-human-model-of-self-resolving-acute-inflammation
#12
Madhur P Motwani, Frances Bennett, Paul C Norris, Alexander A Maini, Marc J George, Justine Newson, Alice Henderson, Adrian J Hobbs, Mark Tepper, Barbara White, Charles N Serhan, Raymond MacAllister, Derek W Gilroy
Anabasum is a synthetic analogue of Δ8 - tetrahydrocannabinol (THC)-11-oic acid that in pre-clinical models of experimental inflammation exerts potent anti-inflammatory actions with minimal CNS cannabimimetic activity. Here we used a novel model of acute inflammation driven by i.d. UV-killed E. coli in healthy humans and found that Anabasum (5mg) exerted a potent anti-inflammatory effect equivalent to that of prednisolone in terms of inhibiting neutrophil infiltration, the hallmark of acute inflammation. These effects arose from the inhibition of the neutrophil chemoattractant LTB4 , while the inhibition of anti-phagocytic prostanoids (PGE2 , TxB2 and PGF2 α) resulted in enhanced clearance of inflammatory stimulus from the injected site...
December 14, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29193757/effects-of-the-consumption-of-milk-biofortified-with-selenium-vitamin-e-and-different-fatty-acid-profile-on-immune-response-in-the-elderly
#13
Karina Pfrimer, Eduardo Ferriolli, Paula Lumy Takeuchi, Márcia Msv Salles, Arlindo Saran-Netto, Marcus A Zanetti, Luiz C Roma-Junior, Camila Bitu Moreno Braga, Fernanda A Domenici, Yara Ml Valim, Adriana Bp Paschoalato, Larissa F Marchi, Ana Ecs Azzolini, Eduardo A Donadi, Edson Martinez, Helio Vannucchi
SCOPE: Nutrition is a major contributing factor for immunocompetence. The aim was to assess the immune status of older after consuming a milk produced by lactating cows fed with one of the following diets: control diet(C), C+vitaminE+selenium(C+A), C+sunfloweroil(C+O), orC+sunflower oil+vitaminE+selenium(A+O). METHODS AND RESULTS: 60elderly received one of these biofortified milks during 12weeks. Immune response was assessed by measurement of the expression of COX-1,2, MCP-1, PPAR(δ,α and β/δ)genes, neutrophil production of oxygen reactive species induced by immune complexes, neutrophil phagocytosis and lytic activity of the alternative pathway of the complement system and cytokine levels...
November 28, 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29183754/nitroxide-tempol-down-regulates-kinase-activities-associated-with-nadph-oxidase-function-in-phagocytic-cells-and-potentially-decreases-their-fungicidal-response
#14
Gérsika B Santos, Ana C G Ribeiro, Samuel N P Lima, Andrés Trostchansky, Cláudio Daniel Cerdeira, Maísa R P L Brigagão
AIMS: The identification of novel targets to control inflammation in humans is probably the primary challenge that impairs the development of new anti-inflammatory drugs. Therefore, the modulation of intracellular signaling pathways in phagocytes may be an interesting means of achieving this goal. However, this change to signaling can compromise the host's susceptibility to invading pathogens. We investigated whether the antioxidant nitroxide Tempol regulates the activity of kinases associated with the production of oxidants in neutrophils, which affects the fungicidal capability of these cells...
November 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29180834/increased-levels-of-s100a8-a9-in-patients-with-peritonsillar-abscess-a-new-promising-diagnostic-marker-to-differentiate-between-peritonsillar-abscess-and-peritonsillitis
#15
Christoph Spiekermann, Antonella Russo, Markus Stenner, Claudia Rudack, Johannes Roth, Thomas Vogl
Peritonsillar abscess (PTA) is a very frequent reason for urgent outpatient consultation and otolaryngological hospital admission. Early, correct diagnosis and therapy of peritonsillar abscess are important to prevent possible life-threatening complications. Based on physical examinations, a reliable differentiation between peritonsillar cellulitis and peritonsillar abscess is restricted. A heterodimeric complex called calprotectin consists of the S100 proteins A8 and A9 (S100A8/A9) and is predominantly expressed not only in monocytes and neutrophils but also in epithelial cells...
2017: Disease Markers
https://www.readbyqxmd.com/read/29173534/canine-neutrophils-activate-effector-mechanisms-in-response-to-leishmania-infantum
#16
REVIEW
Maria Pereira, Ana Valério-Bolas, David Santos-Mateus, Graça Alexandre-Pires, Marcos Santos, Armanda Rodrigues, Hugo Rocha, Ana Santos, Catarina Martins, Ana Tomas, Filipe Passero, Isabel Pereira da Fonseca, Gabriela Santos-Gomes
Canine leishmaniosis caused by L. infantum is a severe zoonotic disease. Although macrophages are the definitive host cells, neutrophils are the first cells to encounter the parasite soon after its inoculation in the dermis by the phlebotomine vector. To study the interaction of dog neutrophils and L. infantum promastigotes, blood neutrophils were isolated from healthy donors and the infection was established in vitro. In the majority of the dogs, L. infantum was efficiently phagocytized by neutrophils, and oxidative (superoxide production) and non-oxidative (neutrophil elastase exocytosis) intracellular effector mechanisms were activated, but the release of neutrophil extracellular traps was minimized...
December 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/29162744/atp-promotes-the-fast-migration-of-dendritic-cells-through-the-activity-of-pannexin-1-channels-and-p2x7-receptors
#17
Pablo J Sáez, Pablo Vargas, Kenji F Shoji, Paloma A Harcha, Ana-María Lennon-Duménil, Juan C Sáez
Upon its release from injured cells, such as infected, transformed, inflamed, or necrotic cells, extracellular adenosine-5'-triphosphate (ATP) acts as a danger signal that recruits phagocytes, such as neutrophils, macrophages, and dendritic cells (DCs), to the site of injury. The sensing of extracellular ATP occurs through purinergic (P2) receptors. We investigated the cellular mechanisms linking purinergic signaling to DC motility. We found that ATP stimulated fast DC motility through an autocrine signaling loop, which was initiated by the activation of P2X7 receptors and further amplified by pannexin 1 (Panx1) channels...
November 21, 2017: Science Signaling
https://www.readbyqxmd.com/read/29136024/severe-oxidative-stress-in-an-acute-inflammatory-demyelinating-model-in-the-rhesus-monkey
#18
Jordon Dunham, Reinofke van de Vis, Jan Bauer, Jacqueline Wubben, Nikki van Driel, Jon D Laman, Bert A 't Hart, Yolanda S Kap
Oxidative stress is increasingly implicated as a co-factor of tissue injury in inflammatory/demyelinating disorders of the central nervous system (CNS), such as multiple sclerosis (MS). While rodent experimental autoimmune encephalomyelitis (EAE) models diverge from human demyelinating disorders with respect to limited oxidative injury, we observed that in a non-human primate (NHP) model for MS, namely EAE in the common marmoset, key pathological features of the disease were recapitulated, including oxidative tissue injury...
2017: PloS One
https://www.readbyqxmd.com/read/29132841/pelargonidin-3-o-glucoside-and-its-metabolites-have-modest-anti-inflammatory-effects-in-human-whole-blood-cultures
#19
Anna M Amini, Karolin Muzs, Jeremy Pe Spencer, Parveen Yaqoob
This study hypothesized that the predominant strawberry anthocyanin, pelargonidin-3-O-glucoside (Pg-3-glc), and 3 of its plasma metabolites (4-hydroxybenzoic acid, protocatechuic acid, and phloroglucinaldehyde [PGA]) would affect phagocytosis, oxidative burst, and the production of selected pro- and anti-inflammatory cytokines in a whole blood culture model. For the assessment of phagocytosis and oxidative burst activity of monocytes and neutrophils, whole blood was preincubated in the presence or absence of the test compounds at concentrations up to 5 μmol/L, followed by analysis of phagocytic and oxidative burst activity using commercially available test kits...
September 21, 2017: Nutrition Research
https://www.readbyqxmd.com/read/29119117/blocking-age-rage-signaling-improved-functional-disorders-of-macrophages-in-diabetic-wound
#20
Qi Wang, Guanya Zhu, Xiaozan Cao, Jiaoyun Dong, Fei Song, Yiwen Niu
Advanced glycosylation end products (AGEs) accumulate in diabetic wounds. Interactions between AGEs and their receptor (RAGE) leads to dermatologic problems in diabetes. Macrophage, which plays important roles in wound healing, highly expresses RAGE. Therefore, we investigated whether RAGE-expressing macrophages might be responsible for impaired wound healing on diabetes. We used anti-RAGE antibody applied topically on diabetic wounds. After confirming that wound healing was improved in anti-RAGE antibody group compared with normal mice, our results showed that macrophages appeared insufficient in the early stage and fading away slowly in the later proliferative phase compared with the control group, which was ameliorated in anti-RAGE antibody-applied wounds...
2017: Journal of Diabetes Research
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