The 162-46 monoclonal antibody recognizes human Trop-2 which is also known as GA733-1. Trop-2 is encoded by TACSTD2 (tumor-associated calcium signal transducer 2). It is a single-pass type-1 transmembrane glycoprotein. Trop-2 was originally identified to be expressed on human trophoblast and choriocarcinoma cell lines. Trop-2 is expressed in most human carcinomas. Trop-2 appears to be involved in the transduction of an intracellular calcium signal, although the exact physiological mechanism has yet to be elucidated.
The antibody was conjugated to BD Horizon™ BUV496 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.