Monomeric IgE: Effect on Microphthalmia Immunological Trigger of Mast Cells by
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IgE alone-induced actin assembly modifies calcium signaling and degranulation in RBL-2H3 mast cells.
In the mast cell signaling pathways, the binding of immunoglobulin E (IgE) to FcepsilonRI, its high-affinity receptor, is generally thought to be a passive step. In this study, we examined the effect of IgE alone, that is, without antigen stimulation, on the degranulation in mast cells. Monomeric IgE (500-5,000 ng/ml) alone increased cytosolic Ca2+ level ([Ca2+]i) and induced degranulation in r...
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The b-chain of the high-affinity receptor for IgE (FceRI) plays a crucial role for amplification of the intracellular signaling in mast cells upon FceRI cross-linking by IgE antigen complexes (IgE Ag). Some monomeric IgE as well as IgE Ag stimulate FceRI-signaling pathways, leading to cell activation, whereas the biological functions of the b-chain in the monomeric IgE-mediated mast cell signal...
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The mechanism of chronic mast cell activation in asthma is unclear. Monomeric immunoglobulin (Ig)E in the absence of allergen induces mediator release from rodent mast cells, indicating a possible role for IgE in the continued activation of mast cells within the asthmatic bronchial mucosa. In this study it was investigated whether monomeric IgE induces Ca2+ influx and mediator release from huma...
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Cockcroft S. Monomeric IgE stimulates NFAT translocation into the nucleus, a rise in cytosol Ca2+, degranulation, and membrane ruffling in the cultured rat basophilic leukemia-2H3 mast cell line. J Immunol 2004; 172: 4048–4058. 5 Nunomura S, Gon Y, Yoshimaru T, et al. Role of the Fc (varepsilon) RI (b)-chain ITAM as a signal regulator for mast cell activation with monomeric IgE. Int Immunol 200...
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Antigen-dependent activation of IgE-bound mast cells is critical for immediate hypersensitivity and other allergic disorders. Recent studies have revealed the effects of monomeric IgEs on mast cell survival and activation. Furthermore, IgE molecules exhibit a wide range of heterogeneity in the ability to induce mast cell activation in the absence of antigen. Highly cytokinergic (HC) IgEs can in...
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