The V24-785 monoclonal antibody binds specifically to BDCA-2 (Blood Dendritic Cell Antigen 2), also known as CD303. As a member of the C-type lectin (CLEC) superfamily, it is an adhesion receptor that binds to galactose-terminated desialylated glycans on cell surfaces and on serum IgG. In the blood, BDCA-2 is expressed only on plasmacytoid dendritic cells (pDC). TLR-9 mediates the production of large amounts of IFN-α and IFN-β by activated pDC, and crosslinking of BDCA-2 inhibits that response.
The antibody was conjugated to BD Horizon™ BUV563 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 which has an Ex Max of 348 nm and an acceptor dye. The tandem has an Em Max at 563 nm. BD Horizon BUV563 can be excited by the 355 nm ultraviolet laser. On instruments with a 561 nm Yellow-Green laser, the recommended bandpass filter is 585/15 nm with a 535 nm long pass to minimize laser light leakage. When BD Horizon BUV563 is used with an instrument that does not have a 561 nm laser, a 560/40 nm filter with a 535 nm long pass may be more optimal. Due to the excitation and emission characteristics of the acceptor dye, there may be spillover into the PE and PE-CF594 detectors. However, the spillover can be corrected through compensation as with any other dye combination.