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Basophil non responder

Michael Y Appel, Liat Nachshon, Arnon Elizur, Michael B Levy, Yitzhak Katz, Michael R Goldberg
BACKGROUND: The prevalence of sesame food allergy (SFA) has increased over recent years, with the potential of anaphylactic reactions upon exposure. Oral food challenge (OFC) remains the diagnostic standard, yet its implementation may be risky. Commercial skin prick tests (SPT) have a low sensitivity. Investigation of alternate diagnostic methods is warranted. OBJECTIVE: To evaluate the utility of SPT and the basophil activation test (BAT) for SFA diagnosis. METHODS: Eighty-two patients with suspected SFA completed an open OFC to sesame or reported a recent confirmed reaction...
May 14, 2018: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
Martin Christian Bucher, Tatjana Petkovic, Arthur Helbling, Urs Christian Steiner
BACKGROUND: Idiopathic non-histaminergic acquired angioedema (InH-AAE) is a rare disease for which there are no available laboratory parameters to clearly define the disorder. Therapy is often difficult and various treatment options have been proposed. In this paper, we have evaluated the most effective therapies for InH-AAE on the basis of current literature and report the therapeutic effect of omalizumab in three patients with InH-AAE. METHODS: Literature was searched with a combination of MeSH/EMTREE terms and freetext search for angioedema and therapy/omalizumab in the databases Medline (Ovid), PubMed/Premedline, Embase, Cochrane library and Scopus with no time or language restrictions...
2017: Clinical and Translational Allergy
A F Santos, W G Shreffler
The diagnosis of IgE-mediated food allergy based solely on the clinical history and the documentation of specific IgE to whole allergen extract or single allergens is often ambiguous, requiring oral food challenges (OFCs), with the attendant risk and inconvenience to the patient, to confirm the diagnosis of food allergy. This is a considerable proportion of patients assessed in allergy clinics. The basophil activation test (BAT) has emerged as having superior specificity and comparable sensitivity to diagnose food allergy, when compared with skin prick test and specific IgE...
September 2017: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
Gustavo Deza, Marta Bertolín-Colilla, Ramon M Pujol, Laia Curto-Barredo, Dulce Soto, Maribel García, Pilar Hernández, Ramon Gimeno, Ana M Giménez-Arnau
Although the efficacy of omalizumab has been clearly demonstrated in the treatment of chronic spontaneous urticaria (CSU), its mechanism of action, which results in improvement in CSU symptoms, is not entirely understood. This study investigated the effect of omalizumab on expression of the high-affinity IgE receptor (FcεRI) on blood basophils from patients with active CSU, and its association with the clinical response. Patients exhibiting significant clinical improvement showed a sharp reduction in the levels of basophil FcεRI after 4 weeks, which was maintained throughout the total duration of the treatment...
June 9, 2017: Acta Dermato-venereologica
Bettina Wagner, Gillian Perkins, Susanna Babasyan, Heather Freer, Alison Keggan, Laura B Goodman, Amy Glaser, Sigurbjorg Torsteinsdóttir, Vilhjálmur Svansson, Sigríður Björnsdóttir
Neonatal foals respond poorly to conventional vaccines. These vaccines typically target T-helper (Th) cell dependent B-cell activation. However, Th2-cell immunity is impaired in foals during the first three months of life. In contrast, neonatal basophils are potent interleukin-4 (IL-4) producers. The purpose of this study was to develop a novel vaccine triggering the natural capacity of neonatal basophils to secrete IL-4 and to evaluate if vaccination resulted in B-cell activation and antibody production against EHV-1 glycoprotein C (gC)...
2017: PloS One
Bruna Araujo David, Rafael Machado Rezende, Maísa Mota Antunes, Mônica Morais Santos, Maria Alice Freitas Lopes, Ariane Barros Diniz, Rafaela Vaz Sousa Pereira, Sarah Cozzer Marchesi, Débora Moreira Alvarenga, Brenda Naemi Nakagaki, Alan Moreira Araújo, Daniela Silva Dos Reis, Renata Monti Rocha, Pedro Elias Marques, Woo-Yong Lee, Justin Deniset, Pei Xiong Liew, Stephen Rubino, Laura Cox, Vanessa Pinho, Thiago Mattar Cunha, Gabriel Rocha Fernandes, André Gustavo Oliveira, Mauro Martins Teixeira, Paul Kubes, Gustavo Batista Menezes
BACKGROUND & AIMS: Resident macrophages are derived from yolk sac precursors and seed the liver during embryogenesis. Native cells may be replaced by bone marrow precursors during extensive injuries, irradiation, and infections. We investigated the liver populations of myeloid immune cells and their location, as well as the dynamics of phagocyte repopulation after full depletion. The effects on liver function due to the substitution of original phagocytes by bone marrow-derived surrogates were also examined...
December 2016: Gastroenterology
Dürdal Us
Superantigens (SAgs) are microbial proteins produced by various microorganisms that elicit excessive and strong stimulation of T cells via an unconventional mechanism. They cause polyclonal activation of T cells in a non-specific manner, by binding to a particular variable-beta (Vβ) chain of T-cell receptor (TCR) and MHC class II molecule, in unprocessed form and outside of peptide-binding cleft, forming a bridge between the antigen presenting cell and the T cell. SAgs are classified into three groups, namely 1) exogenous (soluble proteins and exotoxins secreted by microorganisms), 2) endogenous (transmembrane proteins encoded by viruses which are integrated into the genome) and 3) B-cell SAgs (proteins which stimulate predominantly B cells)...
July 2016: Mikrobiyoloji Bülteni
Kia Joo Puan, Anand Kumar Andiappan, Bernett Lee, Dilip Kumar, Tuck Siong Lai, Giminna Yeo, Derya Bercin, Mireille Starke, Doreen Haase, Josephine Lum, Fook Tim Chew, John Connolly, Siew Cheng Wong, Francesca Zolezzi, Michael Poidinger, De Yun Wang, Olaf Rötzschke
BACKGROUND: Cohort studies indicated that in certain individuals the basophils do not respond toward allergens due to a desensitization of their Fc epsilon receptor pathway. Cause and functional role as well as the implications on allergic reactions, however, are not clear yet. METHODS: A cross-sectional study was carried out in the tropical urban environment of Singapore, where the allergic response is dominated by a single allergen (house dust mite; HDM). Blood samples were collected from 476 individuals and analyzed comprehensively to correlate the functional state of their basophils with the clinical state as well as the composition of the cellular and soluble plasma components...
March 2017: Allergy
Komei Ito, Sakura Sato, Atsuo Urisu, Naoyuki Kando, Tomoko Nakagawa, Ikuya Tsuge, Yasuto Kondo, Setsuko Ito, Masahito Higashiura, Motohiro Ebisawa
BACKGROUND: We evaluated the clinical significance of the spontaneous histamine release ratio (SHR/T) and low responders in the automated basophil histamine release test (AllerportⓇ HRT). METHODS: This study analyzed the outcomes of 101 oral food challenges (OFC) with egg, milk or wheat (challenge-positive: n=79) in relation to the SHR/T. The traditional HRT low responders (n=27) were separated into two groups:"LOW"responders (n=10), who showed a ≥10% concentration-dependent maximum histamine release in response to the anti-human IgE stimulation, and"NON"responders who did not fulfill the criteria (n=17)...
February 2016: Arerugī, [Allergy]
Hannah Pohlit, Iris Bellinghausen, Martina Schömer, Bärbel Heydenreich, Joachim Saloga, Holger Frey
In the last decades, the number of allergic patients has increased dramatically. Allergen-specific immunotherapy (SIT) is the only available cause-oriented therapy so far. SIT reduces the allergic symptoms, but also exhibits some disadvantages; that is, it is a long-lasting procedure and severe side effects like anaphylactic shock can occur. In this work, we introduce a method to encapsulate allergens into nanoparticles to avoid severe side effects during SIT. Degradable nanocarriers combine the advantage of providing a physical barrier between the encapsulated cargo and the biological environment as well as responding to certain local stimuli (like pH) to release their cargo...
October 12, 2015: Biomacromolecules
E Gómez, T D Fernández, I Doña, C Rondon, P Campo, F Gomez, M Salas, M Gonzalez, J R Perkins, F Palomares, M Blanca, M J Torres, C Mayorga
BACKGROUND: Although specific immunotherapy is the only aetiological treatment for allergic disorders, the underlying mechanisms are not fully understood. Specific immunotherapy induces changes in lymphocyte Th subsets from Th2 to Th1/Treg. Whether differences in immunological patterns underlie patient response to immunotherapy has not yet been established. OBJECTIVES: We studied the immunological changes occurring during a 1-year period of Dermatophagoides pteronyssinus (DP) immunotherapy and their relation with clinical outcome...
October 2015: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
K J Wong, V Timbrell, Y Xi, J W Upham, A M Collins, J M Davies
BACKGROUND: Despite the critical role of immunoglobulin E (IgE) in allergy, circulating IgE+ B cells are scarce. Here, we describe in patients with allergic rhinitis B cells with a memory phenotype responding to a prototypic aeroallergen. METHODS: Fifteen allergic rhinitis patients with grass pollen allergy and 13 control subjects were examined. Blood mononuclear cells stained with carboxyfluorescein diacetate succinimidyl ester (CFSE) were cultured with Bahia grass pollen...
April 2015: Allergy
R Agrawal, J Wisniewski, M D Yu, J L Kennedy, T Platts-Mills, P W Heymann, J A Woodfolk
BACKGROUND: Rhinovirus and IgE act in concert to promote asthma exacerbations. While basophils are the principal cell type in the blood that is activated by IgE, their role in virus-induced asthma episodes remains elusive. OBJECTIVE: To monitor IgE responsiveness in circulating basophils of rhinovirus-infected atopic asthmatics during acute infection and convalescence. METHODS: The capacity for basophils to respond to IgE was assessed by testing the effects of allergen, or cross-linking anti-FcεRI and anti-IgE antibodies, on surface TSLP receptor in 24-hour PBMC cultures...
October 2014: Clinical and Experimental Allergy: Journal of the British Society for Allergy and Clinical Immunology
S K Witting Christensen, I Kortekaas Krohn, J Thuraiaiyah, T Skjold, J M Schmid, H J H Hoffmann
BACKGROUND: Sequential allergen desensitization provides temporary tolerance for allergic patients. We adapted a clinical protocol to desensitize human blood basophils ex vivo and investigated the mechanism and allergen specificity. METHODS: We included 28 adult, grass allergic subjects. The optimal, activating allergen concentration was determined by measuring activated CD63(+) CD193(+) SS(Low) basophils in a basophil activation test with 8 log-dilutions of grass allergen...
October 2014: Allergy
Alexander Eggel, Günther Baravalle, Gabriel Hobi, Beomkyu Kim, Patrick Buschor, Patrik Forrer, Jeoung-Sook Shin, Monique Vogel, Beda M Stadler, Clemens A Dahinden, Theodore S Jardetzky
BACKGROUND: The remarkably stable interaction of IgE with its high-affinity receptor FcεRI on basophils and mast cells is critical for the induction of allergic hypersensitivity reactions. Because of the exceptionally slow dissociation rate of IgE-FcεRI complexes, such allergic effector cells permanently display allergen-specific IgE on their surface and immediately respond to allergen challenge by releasing inflammatory mediators. We have recently described a novel macromolecular inhibitor that actively promotes the dissociation of IgE from FcεRI through a molecular mechanism termed facilitated dissociation...
June 2014: Journal of Allergy and Clinical Immunology
J A Schmidt, F M Bell, E Akam, C Marshall, I A Dainty, A Heinemann, I G Dougall, R V Bonnert, C A Sargent
BACKGROUND AND PURPOSE: The discovery of DP2 as a second receptor for PGD2 has prompted the search for antagonists as potential novel therapies based on the associations between PGD2 and disease. Here we describe the biochemical and pharmacological properties of 4-(acetylamino)-3-[(4-chlorophenyl)thio]-2-methyl-1H-indole-1-acetic acid (AZD1981), a novel DP2 receptor antagonist. EXPERIMENTAL APPROACH: Binding to DP2 , functional receptor pharmacology and selectivity were studied in both human and animal systems...
April 2013: British Journal of Pharmacology
Thomas Sandström
Immunoglobulin E (IgE) is central to the pathophysiology of allergic asthma. Omalizumab, an anti-IgE monoclonal antibody, binds to the FcɛRI binding site on free IgE. As a result, circulating free IgE is reduced, IgE is prevented from attaching to mast cells and basophils, and FcɛRI receptor expression is down-regulated. The inflammatory response to allergens and the acute and chronic effector phases of allergic inflammation are thereby attenuated. In clinical trials in adults and adolescents, omalizumab reduced asthma exacerbations, severe asthma exacerbations, inhaled corticosteroid requirements, and emergency visits, as well as significantly improving asthma-related quality of life, morning peak expiratory flow and asthma symptom scores in patients with severe allergic (IgE-mediated) asthma...
2009: Journal of Asthma and Allergy
Elke Schneider, Nathalie Thieblemont, Maria Leite De Moraes, Michel Dy
Basophils belong to a myeloid cell population that has been ignored for more than a century, mainly because of its paucity, its lack of specific markers, and the absence of experimental models. Given that in mice, even the mere existence of basophils was contested, they were alluded to as "histamine-producing cells" or "non-T non-B cells" in initial studies. It is now widely acknowledged that basophils respond to various IgE-dependent or -independent stimuli, and are engaged in a complex cross talk with a number of immunocompetent cells (T or B lymphocytes, macrophages, dendritic cells, endothelial cells…)...
September 2010: European Cytokine Network
Cevdet Ozdemir, Mübeccel Akdis, Cezmi A Akdis
Anaphylaxis is a life-threatening IgE-dependent type 1 hypersensitivity reaction in which multiple organ systems are involved. The existence of allergen exposure and specific IgE are the major contributors to this systemic reaction. The decision of the immune system to respond to allergens is highly dependent on factors including the type and load of allergen, behavior and type of antigen-presenting cells, innate immune response stimulating substances in the same micromilieu, the tissue of exposure, interactions between T and B lymphocytes, costimulators, and genetic propensity known as atopy...
2010: Chemical Immunology and Allergy
José Antonio Cornejo-Garcia, Natalia Blanca-López, Inmaculada Doña, Inmaculada Andreu, José A G Agúndez, Miguel Carballo, Miguel Blanca, María Gabriela Canto
NSAIDs are the most important group of drugs involved in hypersensitivity drug reactions, and include heterogeneous compounds with very different chemical structures. These reactions can be IgE dependent (immediate reactions), T cell-mediated (non-immediate), or induced by a non-specific immunological mechanism related with the blocking of the COX-1 enzyme and the shunting to the lipooxygenase pathway (cross-intolerant reactions). Cutaneous symptoms are the most frequent, with ibuprofen, naproxen and diclofenac being common culprit drugs worldwide, although others can be involved because patterns of consumption and exposure rates vary between countries...
November 2009: Current Drug Metabolism
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