Naïve B-cell receptor specific for pneumococcal capsular polysaccharide epitopes (PPS-specific BCR)

Naïve B-cell receptors specific for pneumococcal capsular polysaccharide (PPS) epitopes are membrane-bound immunoglobulins expressed on the surface of B lymphocytes that have not yet encountered their specific antigen. These receptors are the primary sensors for the complex carbohydrate capsules of Streptococcus pneumoniae, which are critical for bacterial virulence and immune evasion (Clutterbuck et al., 2012, PubMed: 22302121). Upon binding to PPS epitopes, these receptors initiate intracellular signaling cascades that drive B-cell activation, proliferation, and differentiation into antibody-secreting plasma cells (Janeway et al., 2001, Immunobiology). In clinical practice, these receptors are the targets of pneumococcal vaccines; pure polysaccharide vaccines (e.g., PPSV23) act by cross-linking these receptors to induce a T-cell independent response, while conjugate vaccines (e.g., PCV13, PCV20) utilize protein carriers to engage T-cell help (Pollard et al., 2009, Nature Reviews Immunology). The effectiveness of these vaccines depends on the ability of the naïve BCR repertoire to recognize diverse serotypes and transition into high-affinity memory B cells. Understanding the interaction between these receptors and various polysaccharide structures is vital for addressing challenges such as serotype replacement and age-related immunosenescence (CDC, 2023).

Other names

Pneumococcal polysaccharide-specific B-cell receptorAnti-PPS BCRPPS-specific naïve B-cell receptorPneumococcal capsular polysaccharide-binding B-cell receptor

Antigen-mediated cross-linking of B-cell receptors on naïve B cells, which triggers the Ig-alpha/Ig-beta signaling complex, leading to B-cell activation, proliferation, and differentiation into antibody-secreting plasma cells.