B-cell receptor specific for influenza H5 hemagglutinin (BCR-H5HA) (BCR-H5HA)

B-cell receptors (BCRs) specific for influenza H5 hemagglutinin (HA) epitopes are membrane-bound immunoglobulins on B lymphocytes that recognize the H5 subtype of influenza A virus (Kallewaard et al., 2016, PubMed). These receptors are central to the adaptive immune response against highly pathogenic avian influenza (HPAI) strains like H5N1, as they mediate the initial recognition of viral antigens (WHO, 2023). Upon binding to H5 HA, the BCR complex initiates signaling through its CD79A and CD79B subunits, leading to B-cell activation, proliferation, and differentiation into plasma cells that secrete neutralizing antibodies (Treanor, 2004, PubMed). In vaccine development, these receptors are the primary targets for stimulation, with the goal of inducing a robust population of memory B cells and high-titer antibodies (Corti et al., 2011, Science). Research often focuses on BCRs that target conserved epitopes, such as the HA stem, to provide broad protection against diverse H5 clades and potential pandemic variants (Impagliazzo et al., 2015, Science). However, the effectiveness of these receptors can be limited by the virus's rapid antigenic drift and the phenomenon of original antigenic sin, which may favor responses to previously encountered influenza strains (Kim et al., 2012, Journal of Virology).

Other names

H5-specific B-cell receptorAnti-H5 hemagglutinin BCRH5 HA-reactive B-cell receptorH5N1-specific BCR

Binding of H5 hemagglutinin antigens to the B-cell receptor triggers intracellular signaling via the CD79A/B complex, leading to B-cell activation, clonal expansion, and the production of H5-specific neutralizing antibodies.