The BU63 monoclonal antibody specifically recognizes CD86 which is also known as B70, B7-2, B7.2, LAB72 or CD28LG2. CD86 is a ~70-80 kDa type I transmembrane glycoprotein that belongs to the Ig gene superfamily. CD86 is expressed on monocytes, dendritic cells, Langerhans cells, activated B cells, and memory B cells. Like CD80 (B7-1), CD86 serves as a ligand for CD28 or CD152 (CTLA-4) expressed by T cells and can induce costimulatory or coinhibitory signals, respectively. The BU63 antibody can reportedly block the binding of other human CD86-specific antibodies including the 2331 (FUN-1) (complete block) or IT2.2 (partial block) antibodies. These results suggest that the BU63 antibody may bind to a similar or identical CD86 epitope as the 2331 (FUN-1) antibody but to a different, although spatially-related epitope compared with the IT2.2 antibody.
The antibody was conjugated to BD Horizon BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).