The CMRF-56 monoclonal antibody specifically binds to a 96 kDa, early activation/differentiation antigen expressed on dendritic cells (DCs). The CMRF-56 antigen is expressed on isolated Langerhans cells, dermal DCs, migratory dermal DCs and monocyte derived DCs (GM-CSF, IL-4, TNF-α). Circulating blood DCs are CMRF-56-, but its expression is induced within 6 hrs of in vitro culture. Tonsil and synovial fluid DCs upregulate CMRF-56 expression following short-term in vitro culture. It is not detected on resting peripheral blood leukocytes, but is on a subpopulation of tonsil B cells and on in vitro cultured CD19+ cells. CMRF-56 was generated using the Hodgkin's-derived L428 cell line as immunogen. This reagent could be useful in flow cytometric or immunomagnetic separation procedures and immunohistochemical staining of acetone-fixed frozen tissue sections.
The antibody was conjugated to BD Horizon BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).