The L178 monoclonal antibody specifically binds to CD44 which is also known as Homing-associated cell adhesion molecule (H-CAM) or Phagocytic glycoprotein 1 (Pgp-1). CD44 is a single-pass type I transmembrane glycoprotein that exists in a variety of isoforms also known as variant CD44 (CD44v) or CD44R forms. CD44 is synthesized as a 37 kDa polypeptide that is converted to an 80-95 kDa form by glycosylation via N- and O-linkages, or to a 180-200 kDa form by the addition of chondroitin sulfate. It is expressed on leucocytes, erythrocytes, epithelial cells and weakly on platelets. Depending on the cell type, CD44 may participate in a variety of functions including cell adhesion, motility and cell activation.
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).