The T45-2342 monoclonal antibody recognizes the mouse F4/80 antigen which is also known as EGF-like module-containing mucin-like hormone receptor-like 1 (EMR1). F4/80 is a 160 kDa glycoprotein that belongs to the EGF-TM7 family of seven-transmembrane spanning cell surface molecules. It is expressed on the surface of granulocytes and a wide range of mature tissue macrophages including, Kupffer cells, splenic red pulp macrophages, microglia, gut lamina propria macrophages, and Langerhans cells. F4/80 expression has also been reported on subpopulations of dendritic cells. F4/80 expression is heterogeneous and may be increased during inflammatory responses as observed in various mouse models of colitis, diabetes and brain injury.
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.