The 5B5 monoclonal antibody specifically binds to human CD77, a small neutral glycosphingolipid also referred to as globotriaosylceramide (Gb3), Burkitt 's lymphoma associated antigen (BLA), ceramide trihexoside (CTH), and Pk blood group antigen. CD77 is expressed on a subset of germinal center B-lymphocytes including centroblasts that are found with greater frequency in tonsil and mucosal lymphoid tissues and less frequently in peripheral blood, bone marrow and spleen. It has been described as a receptor for Shiga Toxin, produced by Shigella dysenteriae, and Verotoxin 1 (VT1), produced by some strains of E. coli. CD19 has been reported as a ligand for CD77. This interaction may function in adhesion and signal transduction at a specific stage of B cell differentiation. Studies have shown that cross-linking CD77 induces apoptosis in some B cell lines.
This antibody is routinely tested by flow cytometric analysis. Other applications were tested at BD Biosciences Pharmingen during antibody development only or reported in the literature.