The MHD1-314 monoclonal antibody specifically binds to Delta-Like Protein 1 which is also known as Delta1, DLL1, and DL1. Delta-Like Protein 1 is a type 1 transmembrane glycoprotein which belongs to the Delta/Serrate/Jagged Family of Notch receptor ligands. The Notch family of transmembrane receptors and their ligands play key roles in various developmental and postnatal processes by controlling cell-fate decisions. Delta-Like Protein 1 is expressed by cells within heart, pancreas, brain, muscle and hematopoietic/lymphoid tissues. This Notch ligand functions in the development and postnatal activities of the nervous and skeletal systems. It also functions in the hematopoietic and immune systems, for example, by promoting the differentiation of hematopoietic progenitors into T cell and NK cell precursors. The MHD1-314 antibody reportedly inhibits the development of osteoclasts from cultured peripheral blood monocytes suggesting that Delta-Like Protein 1 positively regulates osteoclastogenesis.
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.