Ovalbumin-specific B-cell receptor (OVA-BCR)

The Ovalbumin-specific B-cell receptor (OVA-BCR) is a transmembrane immunoglobulin complex that serves as the primary antigen-recognition component on the surface of B-lymphocytes specific for ovalbumin, the major protein in egg white (Heesters et al., 2017). In research, this receptor is often characterized using the OB1 transgenic mouse model, which is unique for its ability to recognize both conformational and linear epitopes of the OVA protein, facilitating the study of B-cell responses to diverse antigenic forms (Heesters et al., 2017). Upon binding to ovalbumin, the BCR undergoes cross-linking, which triggers intracellular signaling through the Ig-alpha/Ig-beta (CD79A/B) heterodimer, leading to B-cell activation, proliferation, and differentiation into antibody-secreting plasma cells or memory B-cells (Janeway et al., 2001). In clinical contexts, the OVA-BCR is a central driver of egg allergy, where its expression on IgE-switched B-cells contributes to the production of allergen-specific IgE that sensitizes mast cells and basophils (Valenta et al., 2010). Therapeutic approaches targeting this receptor include allergen-specific immunotherapy (AIT), which aims to induce immune tolerance by modulating BCR-mediated signaling and promoting the production of protective IgG4 antibodies (Akdis & Akdis, 2014). Additionally, small molecule inhibitors of downstream BCR signaling components, such as Bruton's tyrosine kinase (BTK), are explored for their potential to suppress allergic B-cell activation (Nore et al., 2013).

Other names

OB1 B-cell receptorAnti-ovalbumin BCROVA-specific BCROvalbumin-specific B-cell receptor recognizing conformational and linear epitopes

Antigen-induced cross-linking of the B-cell receptor complex triggers intracellular signaling via the CD79A/B heterodimer, activating downstream kinases like SYK and BTK to drive B-cell proliferation and antibody production.