The 16-10A1 monoclonal antibody specifically recognizes CD80 (B7-1). This member of the Ig superfamily, like CD86 (B7-2), can bind to either CD28 or CD152 (CTLA-4) and provide either costimulatory or coinhibitory signals to T cells, respectively. CD80 is constitutively expressed on dendritic cells, monocytes, and peritoneal macrophages as well as by activated B cells and T cells. The 16-10A1 antibody blocks binding of CTLA-4 Ig to CD80 as well as T-cell activation by Con A-elicited peritoneal exudate cells or CD80-transfected cell lines. However, the 16-10A1 antibody alone is not able to block T-cell activation by antigen-presenting cells. The 16-10A1 antibody may reportedly block the binding of another CD80-specific antibody, clone 1G10. In addition, the 16-10A1 antibody may crossreact with an activation antigen expressed on IFN-γ-activated alveolar macrophages of the dog.
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).