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Phagocytic activity of neutrophils

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https://www.readbyqxmd.com/read/28711992/oleuropein-and-hydroxytyrosol-inhibit-the-n-formyl-methionyl-leucyl-phenylalanine-induced-neutrophil-degranulation-and-chemotaxis-via-akt-p38-and-erk1-2-map-kinase-inhibition
#1
Samia Bedouhene, Farida Moulti-Mati, Pham My-Chan Dang, Jamel El-Benna
PURPOSE: Oleuropein and hydroxytyrosol are polyphenols that are extracted from olives and are major biological active components of olives and olive oil. Oleuropein and hydroxytyrosol exhibit interesting pharmacological effects on cells, and have been shown to have many health benefits such as anti-inflammatory effects. These effects were mainly attributed to their ability to scavenge the reactive oxygen species (ROS) produced by phagocytes such as neutrophils. The aim of this study was to investigate the effect of oleuropein and hydroxytyrosol on other neutrophil functions...
July 15, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28689359/immunotoxic-responses-of-chronic-exposure-to-cypermethrin-in-common-carp
#2
Siyavash Soltanian, Mohammad Saeed Fereidouni
In the current study, laboratory evaluations were made to assess the immunomodulatory effect of cypermethrin on fingerlings of common carp (Cyprinus carpio L.). Results showed that 96-h LC50 of cypermethrin in common carp was estimated at 0.85 μg/L. Fish were exposed for 21 days to cypermethrin at three sub-lethal concentrations of 0.042, 0.085, and 0.17 μg/L that represented 5, 10, and 20%, respectively, of the 96-h LC50 of the pesticide for this fish species. Blood samples were taken after 7, 14, and 21 days of exposure...
July 8, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28688911/evaluation-of-dietary-hybanthus-enneaspermus-linn-f-muell-as-a-growth-and-haemato-immunological-modulator-in-labeo-rohita
#3
Sib Sankar Giri, Venkatachalam Sukumaran, Jun Woo Jun, Se Chang Park
This study evaluated the effects of Hybanthus enneaspermus aqueous extract (HEE) as a feed supplement on growth, immune responses, haematological, and biochemical parameters of Labeo rohita and its susceptibility to Aeromonas hydrophila infection. Diets containing five variable concentrations of HEE (g kg(-1)) (0 [basal diet], 1.0 [H1], 2.0 [H2], 3.0 [H3], and 4.0 [H4]) were fed to fish (average weight: 17.2 ± 0.21 g) for 6 weeks. Growth parameters, immune parameters, and haemato-biochemical parameters were examined 6 weeks post-feeding...
July 5, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28686966/pectolinarigenin-from-the-leaves-of-clerodendrum-volubile-shows-potent-immunomodulatory-activity-by-inhibiting-t-cell-proliferation-and-modulating-respiratory-oxidative-burst-in-phagocytes
#4
Ochuko L Erukainure, M Ahmed Mesaik, Olubunmi Atolani, Aliyu Muhammad, Chika I Chukwuma, Md Shahidul Islam
There have been increasing interest in the use of plant-derived substance as immunomodulators for the treatment and management of inflammatory ailments. Clerodendrum volubile, a leafy vegetable is known for its folkloric applications in the treatments of several inflammatory related ailments, but with little scientific evidence. This study reports the isolation, structure elucidation and in vitro immunomodulatory potentials of pectolinarigenin from C. volubile leaves. The immunomodulatory potentials of the crude methanolic extract and fractions [n-hexane (Hex), dichloromethane (DCM), ethyl acetate (EtOAc) and n - butanol (BuOH)] were investigated on whole blood, neutrophil and macrophage phagocytic respiratory burst using luminol-amplified chemiluminescence technique...
July 4, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28679535/small-molecule-based-inhibition-of-mek1-2-proteins-dampens-inflammatory-responses-to-malaria-reduces-parasite-load-and-mitigates-pathogenic-outcomes
#5
Xianzhu Wu, Kiran K Dayanand, Ramesh P Thylur, Christopher C Norbury, D Channe Gowda
Malaria infections cause several systemic and severe single or multi-organ pathologies, killing hundreds of thousands of people annually. Considering the existing widespread resistance of malaria parasites to antiparasitic drugs and their high propensity to develop drug resistance, alternative strategies are required to manage malaria infections. Since malaria is a host immune response-driven disease, one approach is based on gaining a detailed understanding of the molecular and cellular processes that modulate malaria-induced innate and adaptive immune responses...
July 5, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28676640/human-neutrophils-phagocytose-and-kill-acinetobacter-baumannii-and-a-pittii
#6
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/28675993/deficient-phagocytosis-among-hiv-1-infected-adults-over-time-even-in-haart-setting
#7
Olga Tsachouridou, Lemonia Skoura, Dimitris Chatzidimitriou, Apostolia Margariti, Adamantini Georgiou, Maria Chatzidimitriou, Dimitrios Bougiouklis, Pantelis Zebekakis, Symeon Metallidis
BACKGROUND: Phagocytosis is regarded to be impaired in HIV-1 infected adults, leading to high frequency and severity of several infections in this population. Data is contradictory with regards to individual facets in HIV infection. OBJECTIVE: Aim of this study was to assess the phagocytic activity during the natural course of HIV infection. METHOD: It is a longitudinal study assessing natural course and impairment of neutrophil and monocyte phagocytosis in both naïve and HAART treated patients...
July 4, 2017: Current HIV Research
https://www.readbyqxmd.com/read/28674180/suppression-of-lipopolysaccharide-induced-inflammatory-response-by-fragments-from-serum-amyloid-a
#8
Huibin Zhou, Mingjie Chen, Gufang Zhang, Richard D Ye
Serum amyloid A (SAA) is known as an acute-phase protein and a biomarker for inflammatory diseases. Published studies have shown that SAA possesses proinflammatory cytokine-like activity and is chemotactic for phagocytes, but the structural basis for these activities remains unidentified. In this article, we report that truncated SAA1 proteins lacking N- and C-terminal sequences exhibit reduced proinflammatory activity and strongly suppress LPS-induced expression of IL-1β, IL-6, and TNF-α in macrophages. A truncated SAA1 containing aa 11-58 was examined further and found to facilitate p38 MAPK phosphorylation while reducing LPS-stimulated phosphorylation of ERK and JNK...
July 3, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28632731/cd47-overexpression-is-associated-with-decreased-neutrophil-apoptosis-phagocytosis-and-poor-prognosis-in-non-small-cell-lung-cancer-patients
#9
Lourdes Barrera, Edgar Montes-Servín, Juan-Manuel Hernandez-Martinez, María de Los Ángeles García-Vicente, Elizabeth Montes-Servín, Marytere Herrera-Martínez, José C Crispín, José Rafael Borbolla-Escoboza, Oscar Arrieta
BACKGROUND: Non-small-cell lung cancer (NSCLC) patients often exhibit neutrophilia, which has been associated with poor clinical outcomes. However, the mechanisms that lead to neutrophilia have not been fully established. CD47 is an antiphagocytic molecule that promotes neutrophil recruitment. METHODS: Blood was collected from 50 treatment-naive patients with advanced NSCLC and from 25 healthy subjects. The frequency of CD66b(+) cells and the expression of CD47 were determined by flow cytometry...
June 20, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28628214/unconventional-role-of-voltage-gated-proton-channels-vsop-hv1-in-regulation-of-microglial-ros-production
#10
Takafumi Kawai, Yoshifumi Okochi, Tomohiko Ozaki, Yoshio Imura, Schuichi Koizumi, Maya Yamazaki, Manabu Abe, Kenji Sakimura, Toshihide Yamashita, Yasushi Okamura
It has been established that voltage-gated proton channels (VSOP/Hv1), encoded by Hvcn1, support reactive oxygen species (ROS) production in phagocytic activities of neutrophils (El Chemaly et al. 2010) and antibody production in B lymphocytes (Capasso et al. 2010). VSOP/Hv1 is a potential therapeutic target for brain ischemia, since Hvcn1 deficiency reduces microglial ROS production and protects brain from neuronal damage (Wu et al. 2012). In the present study, we report that VSOP/Hv1 has paradoxical suppressive role in ROS production in microglia...
June 19, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28608441/transfusion-related-acute-lung-injury-critical-neutrophil-activation-by-anti-hla-a2-antibodies-for-endothelial-permeability
#11
Kathy Khoy, Minh Vu Chuong Nguyen, Dominique Masson, Béatrice Bardy, Christian Drouet, Marie-Hélène Paclet
BACKGROUND: Transfusion-related acute lung injury (TRALI) is a major complication of hemotherapy that may occur after the transfusion of any blood type component. Several clinical reports have suggested the presence of anti-HLA antibodies in the blood product. This study sought to examine the role of anti-HLA-A2 antibodies in polymorphonuclear neutrophil (PMN) activation and thus in endothelial permeability. STUDY DESIGN AND METHODS: PMN activation was assessed by both nicotinamide adenine dinucleotide phosphate oxidase (NADPH oxidase) activity and reactive oxygen species (ROS) production...
June 13, 2017: Transfusion
https://www.readbyqxmd.com/read/28601846/nadph-oxidase-depletion-in-neutrophils-from-patients-with-cirrhosis-and-restoration-via-toll-like-receptor-7-8-activation
#12
Loïc Rolas, Abdelali Boussif, Emmanuel Weiss, Philippe Lettéron, Oualid Haddad, Jamel El-Benna, Pierre-Emmanuel Rautou, Richard Moreau, Axel Périanin
OBJECTIVE: Cirrhosis downregulates phagocyte oxidant production via their antibacterial superoxide-generating system, NADPH oxidase (NOX2) and increases patients' susceptibility to infection and mortality rate. To explore novel biochemical parameters that explain susceptibility to infections, we investigated the expression of NOX2 and partners in neutrophils of patients with severe alcoholic cirrhosis and have provided a novel approach to restore superoxide production capacity in patients' neutrophils and blood...
June 10, 2017: Gut
https://www.readbyqxmd.com/read/28584999/assessment-of-post-vaccination-phagocytic-activation-using-candida-albicans-killing-assays
#13
Wenqing Li, Yan Hu
Candida albicans is an important opportunistic fungal pathogen. It is now the fourth leading cause of nosocomial bloodstream infections and a great threat to the immuncompromised patients attributed to the disseminated candidiasis with the mortality up to 40%. Phagocytic cells are the first line of defense against Candida infections. Antibodies induced by vaccination can effectively enhance the capacities of phagocytosis and killing of neutrophils and macrophages. In this chapter, flow cytometric analysis (FACS) and killing assay by plate culture methods are introduced to evaluate the phagocytosis and killing of strains of Candida albicans opsonized with immune serum obtained from mice vaccinated with yeast and recombinant enolase...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28569730/inflammasomes-and-il-1-biology-in-the-pathogenesis-of-allograft-dysfunction
#14
REVIEW
S Samuel Weigt, Vyacheslav Palchevskiy, John A Belperio
Inflammasomes are high-molecular-weight cytosolic complexes that mediate the activation of caspases. There are many inflammasomes, and each is influenced by a unique pattern-recognition receptor response. Two signals are typically involved in the inflammasome pathways. Signal one involves recognition of pathogen-associated molecular patterns (PAMPs), such as LPS or other colonizing/invading microbes, that interact with TLRs, which induce the downstream production of pro-IL-1β. This is followed by signal two, which involves recognition of PAMPs or damage-associated molecular patterns (DAMPs), such as uric acid or ATP, via NLRP3, which leads to caspase-1-dependent cleavage of pro-IL-1β to active IL-1β and pyroptosis...
June 1, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28554712/the-role-of-cr3-cd11b-cd18-and-cr4-cd11c-cd18-in-complement-mediated-phagocytosis-and-podosome-formation-by-human-phagocytes
#15
Szilvia Lukácsi, Zsuzsa Nagy-Baló, Anna Erdei, Noémi Sándor, Zsuzsa Bajtay
CR3 and CR4 belong to the family of β2-integrins and play an important role in phagocytosis, cellular adherence and migration. CR3 and CR4 are generally expected to mediate similar functions due to their structural homology, overlapping ligand specificity and parallel expression on human phagocytes. Although the different signalling pathways of these receptors suggest distinct functions, possible differences are just being revealed. Previously we proved that CR3 plays a key role in the uptake of iC3b-opsonized particles by human dendritic cells...
May 26, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28553230/the-lrrc8a-mediated-swell-activated-chloride-conductance-is-dispensable-for-vacuolar-homeostasis-in-neutrophils
#16
Philippe Behe, Juliet R Foote, Adam P Levine, Craig D Platt, Janet Chou, Fernando Benavides, Raif S Geha, Anthony W Segal
The dialysis of human and mouse neutrophils in patch clamp experiments in the conventional whole-cell mode induces the emergence of a chloride (Cl(-)) current that appeared to be primarily regulated by cytoplasmic ionic strength. The characteristics of this current resembled that of the classical, and ubiquitous volume-sensitive outwardly rectifying Cl(-) current: strong outward rectification, selectivity sequence of the Eisenman1 type, insensitivity to external pH and strong inhibition by tamoxifen, DCPIB and WW781...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28550115/involvement-of-cell-surface-90-kda-heat-shock-protein-hsp90-in-pattern-recognition-by-human-monocyte-derived-macrophages
#17
Małgorzata Bzowska, Anna Nogieć, Krystian Bania, Magdalena Zygmunt, Mirosław Zarębski, Jerzy Dobrucki, Krzysztof Guzik
Heat shock proteins (HSPs) are typical intracellular chaperones which also appear on the cell surface and in extracellular milieu. HSP90, which chaperones many proteins involved in signal transduction, is also a regular component of LPS-signaling complexes on Mϕ. As LPS is a prototypical PAMP, we speculated that HSP90 is engaged in pattern recognition by professional phagocytes. In this report, we provide the first evidence, to our knowledge, of the geldanamycin (Ge)-inhibitable HSP90 on the surface of live monocyte-derived Mϕs (hMDMs)...
May 26, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28532685/nitroxide-4-hydroxy-2-2-6-6-tetramethylpiperidine-1-oxyl-tempol-inhibits-the-reductase-activity-of-protein-disulfide-isomerase-via-covalent-binding-to-the-cys400-residue-on-cxxc-redox-motif-at-the-a-active-site
#18
Gérsika Bitencourt Santos, Lucia Gonzalez-Perilli, Mauricio Mastrogiovanni, Adrián Aicardo, Cláudio Daniel Cerdeira, Andrés Trostchansky, Maísa Ribeiro Pereira Lima Brigagão
BACKGROUND AND AIM: Oxidative stress arising from inflammatory processes is a serious cause of cell and tissue damage. Tempol is an efficient antioxidant with superoxide dismutase-like activity. The purpose of this paper is to address the inhibition of protein disulfide isomerase (PDI), an essential redox chaperone whose active sites contain the Cys-Gly-His-Cys (CXXC) motif, by the nitroxide Tempol. RESULTS: In the presence of Tempol (5-120 μM), the reductase activity of PDI was reversibly affected both in vitro and in activated mice neutrophils, with an IC50 of 22...
June 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28495931/neutrophil-extracellular-traps-drive-endothelial-to-mesenchymal-transition
#19
Elmar Pieterse, Nils Rother, Marjolein Garsen, Julia M Hofstra, Simon C Satchell, Markus Hoffmann, Markus A Loeven, Hanneke K Knaapen, Olivier W H van der Heijden, Jo H M Berden, Luuk B Hilbrands, Johan van der Vlag
OBJECTIVE: An excessive release and impaired degradation of neutrophil extracellular traps (NETs) leads to the continuous exposure of NETs to the endothelium in a variety of hematologic and autoimmune disorders, including lupus nephritis. This study aims to unravel the mechanisms through which NETs jeopardize vascular integrity. APPROACH AND RESULTS: Microvascular and macrovascular endothelial cells were exposed to NETs, and subsequent effects on endothelial integrity and function were determined in vitro and in vivo...
July 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28495524/granulomatosis-with-polyangiitis-wegener-granulomatosis-a-proteinase-3-driven-disease
#20
Véronique Witko-Sarsat, Nathalie Thieblemont
Granulomatosis with polyangiitis (GPA, Wegener granulomatosis) is a systemic autoimmune vasculitis that affects small arteries, arterioles, and capillaries, most notably in the kidneys and lungs. In this disease, proteinase-3 (PR3), produced by neutrophils, is targeted by antineutrophil cytoplasmic antibodies (ANCA). Recent work by our group has shown how PR3 impairs the resolution of inflammation and deregulates the immune system. Normally, the clearance of activated neutrophils triggers an anti-inflammatory, pro-resolution process...
May 8, 2017: Joint, Bone, Spine: Revue du Rhumatisme
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