The L17F12 monoclonal antibody specifically binds to CD5 which is also known as Lymphocyte antigen T1 (T1) or LEU1/Leu-1. CD5 is an ~67 kDa single-chain, type 1 transmembrane glycoprotein expressed on most thymocytes, the majority of peripheral T lymphocytes and a subpopulation of B cells. CD5+ B cells produce polyreactive antibodies (mostly IgM). This CD5-specific antibody also reacts with many T-cell leukemias and lymphomas and most Ig+ B-cell chronic lymphoblastic leukemia (B-CLL) cells. CD72 has been shown to be the natural ligand for CD5.
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.