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Mast Cell Activation

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https://www.readbyqxmd.com/read/28315853/effects-of-extracts-and-compounds-from-tricholoma-populinum-lange-on-degranulation-and-il-2-il-8-secretion-of-immune-cells
#1
Simon Merdivan, Kristina Jenett-Siems, Karsten Siems, Timo H J Niedermeyer, Nadin Schultze, Carmen Steinborn, Carsten Gründemann, Ulrike Lindequist
Tricholoma populinum Lange is an edible basidiomycete from the family Tricholomataceae. Extracts, fractions, and different metabolites isolated from the fruiting bodies of this mushroom were tested for degranulation-inhibiting activities on RBL-2H3 cells (rat basophils). Dichloromethane extracts decreased degranulation significantly, as did a fraction after column chromatography. In addition, the extract decreased the IL-2 release from Jurkat T cells and the release of IL-8 from HMC-1 human mast cells. The results show the significant effects of extracts of T...
March 20, 2017: Zeitschrift Für Naturforschung. C, A Journal of Biosciences
https://www.readbyqxmd.com/read/28299830/repeated-water-avoidance-stress-induces-visceral-hypersensitivity-role-of-il-1-il-6-and-peripheral-corticotropin-releasing-factor
#2
Tsukasa Nozu, Saori Miyagishi, Rintaro Nozu, Kaoru Takakusaki, Toshikatsu Okumura
BACKGROUND AND AIM: Repeated water avoidance stress (WAS) induces visceral hypersensitivity. Additionally, it is also known to activate corticotropin-releasing factor (CRF), mast cells and pro-inflammatory cytokines systems, but their precise roles on visceral sensation have not been determined definitely. The aim of the study was to explore this issue. METHODS: Abdominal muscle contractions induced by colonic balloon distention, i.e. visceromotor response (VMR) was detected electrophysiologically in conscious rats...
March 15, 2017: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/28294257/protein-bound-vaccinium-fruit-polyphenols-decrease-ige-binding-to-peanut-allergens-and-rbl-2h3-mast-cell-degranulation-in-vitro
#3
Nathalie J Plundrich, Rishipal R Bansode, E Allen Foegeding, Leonard L Williams, Mary Ann Lila
Peanut allergy is a worldwide health concern. In this study, the natural binding properties of plant-derived polyphenols to proteins was leveraged to produce stable protein-polyphenol complexes comprised of peanut proteins and cranberry (Vaccinium macrocarpon Ait.) or lowbush blueberry (Vaccinium angustifolium Ait.) pomace polyphenols. Protein-bound and free polyphenols were characterized and quantified by multistep extraction of polyphenols from protein-polyphenol complexes. Immunoblotting was performed with peanut-allergic plasma to determine peanut protein-specific IgE binding to unmodified peanut protein, or to peanut protein-polyphenol complexes...
March 15, 2017: Food & Function
https://www.readbyqxmd.com/read/28293189/investigation-into-the-role-of-pi3k-and-jak3-kinase-inhibitors-in-murine-models-of-asthma
#4
Akshaya D Wagh, Manoranjan Sharma, Jogeshwar Mahapatra, Abhijeet Chatterjee, Mukul Jain, Veeranjaneyulu Addepalli
Asthma is a clinical disorder commonly characterized by chronic eosinophilic inflammation, remodeling and hyper responsiveness of the airways. However, the kinases like Phosphoinositide 3 kinase (PI3K) and Janus kinase 3 (JAK3) are involved in mast cell proliferation, activation, recruitment, migration, and prolonged survival of inflammatory cells. The present study was designed to evaluate the in-vivo comparative effects of two kinase inhibitors on airway inflammation and airway remodeling in acute and chronic models of asthma...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28292887/orai-and-trpc-channel-characterization-in-fc%C3%AE%C2%B5ri-mediated-calcium-signaling-and-mediator-secretion-in-human-mast-cells
#5
Hannah E Wajdner, Jasmine Farrington, Claire Barnard, Peter T Peachell, Christine G Schnackenberg, Joseph P Marino, Xiaoping Xu, Karen Affleck, Malcolm Begg, Elizabeth P Seward
Inappropriate activation of mast cells via the FcεRI receptor leads to the release of inflammatory mediators and symptoms of allergic disease. Calcium influx is a critical regulator of mast cell signaling and is required for exocytosis of preformed mediators and for synthesis of eicosanoids, cytokines and chemokines. Studies in rodent and human mast cells have identified Orai calcium channels as key contributors to FcεRI-initiated mediator release. However, until now the role of TRPC calcium channels in FcεRI-mediated human mast cell signaling has not been published...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28290212/spirodela-polyrhiza-extract-modulates-the-activation-of-atopic-dermatitis-related-ion-channels-orai1-and-trpv3-and-inhibits-mast-cell-degranulation
#6
Joo Hyun Nam, Hyo Won Jung, Young-Won Chin, Won-Mo Yang, Hyo Sang Bae, Woo Kyung Kim
CONTEXT: Spirodela polyrhiza (L.) Schleid. (Lemnaceae), Spirodelae Herba (SH), has been known to relieve inflammation, urticaria and skin symptoms including pruritus, eczema and rash. OBJECTIVE: The effects of SH extract on two calcium ion channels, Orai1 and TRPV3, and their potential as novel therapeutics for atopic dermatitis (AD) were investigated. The regulatory role of Orai1 on mast cell degranulation was evaluated. MATERIALS AND METHODS: The dried leaves of SH were extracted by 70% methanol...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/28289409/mitochondrial-dna-activates-the-nlrp3-inflammasome-and-predisposes-to-type-1-diabetes-in-murine-model
#7
Daniela Carlos, Frederico R C Costa, Camila A Pereira, Fernanda A Rocha, Juliana N U Yaochite, Gabriela G Oliveira, Fernando S Carneiro, Rita C Tostes, Simone G Ramos, Dario S Zamboni, Niels O S Camara, Bernhard Ryffel, João S Silva
Although a correlation between polymorphisms of NOD-like receptor family-pyrin domain containing 3 (NLRP3) and predisposition to type 1 diabetes (T1D) has been identified, the potential function and activation of the NLRP3 inflammasome in T1D have not been clarified. The present study shows that non-obese diabetic mice exhibited increased NLRP3, and pro-IL-1β gene expression in pancreatic lymph nodes (PLNs). Similar increases in gene expression of NLRP3, apoptosis associated speck like protein (ASC) and pro-IL-1β were induced by multiple low doses of streptozotocin (STZ) in C57BL/6 mice...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28288109/in-silico-design-of-novel-probes-for-the-atypical-opioid-receptor-mrgprx2
#8
Katherine Lansu, Joel Karpiak, Jing Liu, Xi-Ping Huang, John D McCorvy, Wesley K Kroeze, Tao Che, Hiroshi Nagase, Frank I Carroll, Jian Jin, Brian K Shoichet, Bryan L Roth
The primate-exclusive MRGPRX2 G protein-coupled receptor (GPCR) has been suggested to modulate pain and itch. Despite putative peptide and small-molecule MRGPRX2 agonists, selective nanomolar-potency probes have not yet been reported. To identify a MRGPRX2 probe, we first screened 5,695 small molecules and found that many opioid compounds activated MRGPRX2, including (-)- and (+)-morphine, hydrocodone, sinomenine, dextromethorphan, and the prodynorphin-derived peptides dynorphin A, dynorphin B, and α- and β-neoendorphin...
March 13, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28283060/decoupling-the-functional-pleiotropy-of-stem-cell-factor-by-tuning-c-kit-signaling
#9
Chia Chi M Ho, Akanksha Chhabra, Philipp Starkl, Peter-John Schnorr, Stephan Wilmes, Ignacio Moraga, Hye-Sook Kwon, Nicolas Gaudenzio, Riccardo Sibilano, Tom S Wehrman, Milica Gakovic, Jonathan T Sockolosky, Matthew R Tiffany, Aaron M Ring, Jacob Piehler, Irving L Weissman, Stephen J Galli, Judith A Shizuru, K Christopher Garcia
Most secreted growth factors and cytokines are functionally pleiotropic because their receptors are expressed on diverse cell types. While important for normal mammalian physiology, pleiotropy limits the efficacy of cytokines and growth factors as therapeutics. Stem cell factor (SCF) is a growth factor that acts through the c-Kit receptor tyrosine kinase to elicit hematopoietic progenitor expansion but can be toxic when administered in vivo because it concurrently activates mast cells. We engineered a mechanism-based SCF partial agonist that impaired c-Kit dimerization, truncating downstream signaling amplitude...
March 9, 2017: Cell
https://www.readbyqxmd.com/read/28282783/diospyros-lotus-leaf-and-grapefruit-stem-extract-synergistically-ameliorate-atopic-dermatitis-like-skin-lesion-in-mice-by-suppressing-infiltration-of-mast-cells-in-skin-lesions
#10
Byoung Ok Cho, Denis Nchang Che, Hong Hua Yin, Jae Young Shin, Seon Il Jang
Atopic dermatitis, a chronic relapsing and pruritic inflammation of the skin also thought to be involved in, or caused by immune system destruction is an upsetting health problem due to its continuously increasing incidence especially in developed countries. Mast cell infiltration in atopic dermatitis skin lesions and its IgE-mediated activation releases various cytokines and chemokines that have been implicated in the pathogenesis of atopic dermatitis. This study was aimed at investigating synergistic anti-inflammatory, anti-pruritic and anti-atopic dermatitis effects of Diospyros lotus leaf extract (DLE) and Muscat bailey A grapefruit stem extract (GFSE) in atopic dermatitis-like induced skin lesions in mice...
March 6, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28282470/phospholipid-scramblase-1-amplifies-anaphylactic-reactions-in-vivo
#11
Asma Kassas-Guediri, Julie Coudrat, Emeline Pacreau, Pierre Launay, Renato C Monteiro, Ulrich Blank, Nicolas Charles, Marc Benhamou
Mast cells are critical actors of hypersensitivity type I (allergic) reactions by the release of vasoactive and proinflammatory mediators following their activation by aggregation of the high-affinity receptor for immunoglobulin E (FcεRI). We have previously identified Phospholipid Scramblase 1 (PLSCR1) as a new molecular intermediate of FcεRI signaling that amplifies degranulation of the rat mast cell line RBL-2H3. Here we characterized primary mast cells from Plscr1-/- mice. The absence of PLSCR1 expression did not impact mast cell differentiation as evidenced by unaltered FcεRI expression, general morphology, amount of histamine stored and expression of FcεRI signal effector molecules...
2017: PloS One
https://www.readbyqxmd.com/read/28279759/what-do-we-know-about-the-structure-of-human-thymic-hassall-s-corpuscles-a-histochemical-immunohistochemical-and-electron-microscopic-study
#12
Renáta Mikušová, Veronika Mešťanová, Štefan Polák, Ivan Varga
Hassall's corpuscles are the most prominent structures in the human thymus. However, relatively few analyses have been performed to determine their function and cellular origins during development. In this study, we evaluated the cellular microenvironment of human thymic Hassall's corpuscles using histochemistry, immunohistochemistry, and transmission electron microscopy. We examined 95 human thymic tissue samples, which were perioperatively obtained from children undergoing cardiac surgery. To characterize the complex cellular microenvironment of human thymic corpuscles, we used a panel of 14 different antibodies to identify discrete cell types...
March 6, 2017: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/28279492/group-2-innate-lymphoid-cells-are-recruited-to-the-nasal-mucosa-in-patients-with-aspirin-exacerbated-respiratory-disease
#13
Jacqueline J Eastman, Kellen J Cavagnero, Adam S Deconde, Alex S Kim, Maya R Karta, David H Broide, Bruce L Zuraw, Andrew A White, Sandra C Christiansen, Taylor A Doherty
BACKGROUND: Aspirin-exacerbated respiratory disease (AERD) is characterized by tissue eosinophilia and mast cell activation, including abundant production of prostaglandin D2 (PGD2). Group 2 innate lymphoid cells (ILC2s), which promote tissue eosinophilia and mast cell responses, undergo chemotaxis and cytokine production in response to PGD2, but it is unknown whether ILC2s are active in patients with AERD. OBJECTIVE: We sought to determine whether ILC2 numbers change in peripheral blood and the nasal mucosa during COX-1 inhibitor-induced reactions in patients with AERD...
January 27, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28277274/therapeutic-reversal-of-food-allergen-sensitivity-by-mature-retinoic-acid-differentiated-dendritic-cell-induction-of-lag3-cd49b-foxp3-regulatory-t%C3%A2-cells
#14
Wojciech Dawicki, Chunyan Li, Jennifer Town, Xiaobei Zhang, John R Gordon
BACKGROUND: Anaphylaxis is a life-threatening condition for which we have limited therapeutic options. Although specific immunotherapy for food allergies is becoming more effective, it is still laborious and carries substantial risk of adverse events. On the other hand, regulatory dendritic cell (DC) therapy is effective in mouse models of allergic disease and has been shown to work with TH2 cells from atopic asthmatic patients. OBJECTIVE: We assessed whether DC immunotherapy could reverse food allergen sensitivity in mouse models to provide proof of concept relating to their use in the clinic...
October 20, 2016: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/28274846/acute-granulocyte-macrophage-colony-stimulating-factor-treatment-modulates-neuroinflammatory-processes-and-promotes-tactile-recovery-after-spinal-cord-injury
#15
Sandie Thomaty, Laurent Pezard, Christian Xerri, Jean-Michel Brezun
Neuroinflammation is known to play a key role in the prognosis of functional recovery after spinal cord injury (SCI). The involvement of microglial and mast cells in early and late stages of inflammation has been receiving increasing attention. This study was aimed at determining the influence of a pro-inflammatory cytokine, the granulocyte macrophage-colony stimulating factor (GM-CSF), on microglia and mast cell activation, glial scar formation and functional recovery following SCI. Rats were randomly injected with saline or GM-CSF one hour after a C4-C5 medio-lateral hemisection...
March 6, 2017: Neuroscience
https://www.readbyqxmd.com/read/28266165/il33-and-il1rl1-variants-are-associated-with-asthma-and-atopy-in-a-brazilian-population
#16
G A Queiroz, R S Costa, N M Alcantara-Neves, G Nunes de Oliveira Costa, M L Barreto, V L Carneiro, C A Figueiredo
Atopic asthma is a chronic inflammatory disease in airways resulting from genetic and environmental factors, characterized by production of the Th2 cytokines interleukin-4 (IL-4), interleukin-5 (IL-5) and interleukin-13 (IL-13). Interleukin-33 (IL-33) appears to be a potent inducer of Th2 immune response. This occurs when IL-33 binds and activates its receptor, the membrane ST2 (ST2L) in mast cells, dendritic cells, basophils, eosinophils, innate lymphoids and Th2 cells, leading to the release of these cytokines and intensifying allergic inflammation...
April 2017: International Journal of Immunogenetics
https://www.readbyqxmd.com/read/28264498/retinoic-acid-negatively-impacts-proliferation-and-mctc-specific-attributes-of-human-skin-derived-mast-cells-but-reinforces-allergic-stimulability
#17
Magda Babina, Metin Artuc, Sven Guhl, Torsten Zuberbier
The Vitamin-A-metabolite retinoic acid (RA) acts as a master regulator of cellular programs. Mast cells (MCs) are primary effector cells of type-I-allergic reactions. We recently uncovered that human cutaneous MCs are enriched with RA network components over other skin cells. Yet, direct experimental evidence on the significance of the RA-MC axis is limited. Here, skin-derived cultured MCs were exposed to RA for seven days and investigated by flow-cytometry (BrdU incorporation, Annexin/PI, FcεRI), microscopy, RT-qPCR, histamine quantitation, protease activity, and degranulation assays...
February 28, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28263785/nociceptive-neuronal-fc-gamma-receptor-i-is-involved-in-igg-immune-complex-induced-pain-in-the-rat
#18
Haowu Jiang, Xinhua Shen, Zhiyong Chen, Fan Liu, Tao Wang, Yikuan Xie, Chao Ma
Antigen-specific immune diseases such as rheumatoid arthritis are often accompanied by pain and hyperalgesia. Our previous studies have demonstrated that Fc-gamma-receptor type I (FcγRI) is expressed in a subpopulation of rat dorsal root ganglion (DRG) neurons and can be directly activated by IgG immune complex (IgG-IC). In this study we investigated whether neuronal FcγRI contributes to antigen-specific pain in the naïve and rheumatoid arthritis model rats. In vitro calcium imaging and whole-cell patch clamp recordings in dissociated DRG neurons revealed that only the small-, but not medium- or large-sized DRG neurons responded to IgG-IC...
March 2, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28263381/obesity-promotes-prolonged-ovalbumin-induced-airway-inflammation-modulating-th1-th2-and-th17-immune-responses-in-balb-c-mice
#19
F M C Silva, E E Oliveira, A C C Gouveia, A S S Brugiolo, C C Alves, J O A Correa, J Gameiro, J Mattes, H C Teixeira, A P Ferreira
Clinical and epidemiological studies indicate that obesity affects the development and phenotype of asthma by inducing inflammatory mechanisms in addition to eosinophilic inflammation. The aim of this study was to assess the effect of obesity on allergic airway inflammation and T helper 2 (Th2) immune responses using an experimental model of asthma in BALB/c mice. Mice fed a high-fat diet (HFD) for 10 weeks were sensitized and challenged with ovalbumin (OVA), and analysis were performed at 24 and 48 hours after the last OVA challenge...
March 6, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/28262689/contribution-of-engineered-nanomaterials-physicochemical-properties-to-mast-cell-degranulation
#20
Monica M Johnson, Ryan Mendoza, Achyut J Raghavendra, Ramakrishna Podila, Jared M Brown
The rapid development of engineered nanomaterials (ENMs) has grown dramatically in the last decade, with increased use in consumer products, industrial materials, and nanomedicines. However, due to increased manufacturing, there is concern that human and environmental exposures may lead to adverse immune outcomes. Mast cells, central to the innate immune response, are one of the earliest sensors of environmental insult and have been shown to play a role in ENM-mediated immune responses. Our laboratory previously determined that mast cells are activated via a non-FcεRI mediated response following silver nanoparticle (Ag NP) exposure, which was dependent upon key physicochemical properties...
March 6, 2017: Scientific Reports
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