The 421203 monoclonal antibody specifically recognizes Claudin-1 which is also known as Senescence-associated epithelial membrane protein 1 (SEMP1) or Ichthyosis, leukocyte vacuoles, alopecia, and sclerosing cholangitis (ILVASC). Claudin-1 is a ~23 kDa multi-pass membrane protein that is encoded by CLDN1 (claudin 1) which belongs to the claudin family. Claudin-1 is expressed by Langerhans cells, dendritic cells, epithelial cells and endothelial cells. It serves as a major component of tight junctions between epithelial or endothelial cells. Claudin-1 may also function as a co-receptor for Hepatitis C virus (HCV) entry into hepatic cells. Dysregulated Claudin-1 expression has been detected in multiple types of cancer.
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).