The S35-934 monoclonal antibody specifically binds to TNF-related apoptosis inducing ligand receptor 1 (TRAIL-R1/TRAIL Receptor 1). TRAIL-R1 is also known as CD261, Death Receptor 4 (DR4) and APO2. TRAIL-R1 is a type I transmembrane protein that is encoded by TNFRSF10A (tumor necrosis factor receptor superfamily, member 10a). It serves as a receptor for TNF-related apoptosis-inducing ligand (TRAIL) which is also known as CD253 and TNFSF10. TRAIL-R1 is expressed by a variety of tumor-derived cell lines. It is generally expressed at very low levels by most leucocytes. When bound by TRAIL, TRAIL-R1 can promote recruitment and subsequent activation of caspase-8, ultimately triggering the activation of effector caspases within cells that lead to apoptosis. Many transformed cell types are susceptible to TRAIL:TRAIL-R1-mediated cell death whereas normal cells are typically resistant.
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).