High-affinity immunoglobulin E receptor (FcεRI) complexed with Ves v 5-specific IgE (FcεRI-IgE(Ves v 5))

The Ves v 5-specific IgE bound to the high-affinity IgE receptor (FcεRI) on mast cells and basophils is the central molecular assembly responsible for wasp venom-induced allergic reactions (PubMed: PMID 29411314). Ves v 5 is the primary major allergen found in the venom of the common wasp (Vespula vulgaris), belonging to the Antigen 5 protein family (UniProt: P35759). In sensitized individuals, Ves v 5-specific IgE antibodies are produced and dock onto the FcεRI receptors located on the surface of effector cells like mast cells and basophils (NCBI: Gene ID 2205). Upon subsequent exposure to wasp venom, the Ves v 5 allergen cross-links these bound IgE molecules, initiating an intracellular signaling cascade that results in the rapid release of inflammatory mediators such as histamine and proteoglycans. This physiological response can lead to clinical manifestations ranging from localized skin reactions to systemic anaphylaxis (StatPearls: NBK448113). Current therapeutic approaches focus on reducing the density of these complexes via anti-IgE monoclonal antibodies like omalizumab, which sequester free IgE (PubChem: CID 160786), or modifying the immune response through venom immunotherapy to favor the production of neutralizing IgG4 antibodies.

Other names

Ves v 5-IgE-FcεRI complexWasp venom allergen-IgE-receptor complexFc epsilon RI-IgE-Ves v 5 complexVespula vulgaris Antigen 5-IgE-FcεRI complex

Therapeutic intervention typically involves sequestering free IgE to prevent its binding to the receptor (e.g., omalizumab) or inducing allergen-specific IgG4 antibodies through venom immunotherapy to compete with IgE for allergen binding, thereby preventing receptor cross-linking.