High-affinity immunoglobulin E receptor-bound IgE complex (IgE-FcεRI) (IgE-FcεRI)

The High-affinity immunoglobulin E receptor-bound IgE complex (IgE-FcεRI) is a molecular assembly formed by the binding of Immunoglobulin E (IgE) to its high-affinity receptor, FcεRI, primarily on the surface of mast cells and basophils (Sutton & Gould, 1993). This complex serves as the primary sensor for allergens; upon cross-linking by a multivalent antigen, it initiates an intracellular signaling cascade leading to the degranulation of inflammatory mediators such as histamine, proteases, and cytokines (Gould & Sutton, 2008). This process is the fundamental driver of Type I hypersensitivity reactions and plays a central role in the pathogenesis of allergic diseases, including asthma and chronic spontaneous urticaria (Kim et al., 2012). While established monoclonal antibodies like omalizumab primarily target free serum IgE to prevent the formation of these complexes, emerging therapeutic approaches focus on "IgE disruptors" or "strippers" designed to actively dissociate pre-bound IgE from the receptor (Eggel et al., 2014). Targeting this complex is a key strategy for rapidly neutralizing the allergic effector phase and reducing the sensitivity of mast cells and basophils to allergens (MacGlashan, 2005).

Other names

IgE-FcεRI complexReceptor-bound IgEMast cell-bound IgEBasophil-bound IgEMembrane-bound IgE complex

Dissociation of IgE from FcεRI, prevention of IgE-FcεRI complex formation, and downregulation of FcεRI surface expression