The ITEM-1 monoclonal antibody specifically binds to CD266, which is also known as TWEAK Receptor (TWEAK-R/TWEAKR), or Fibroblast growth factor inducible 14 (FGF-inducible 14, FN14). CD266 is a ~14 kDa type I transmembrane protein that is the 12A family member of the tumor necrosis factor receptor superfamily (TNFRSF12A). It is expressed at low levels in a variety of tissues including, heart, placenta, lung, muscle, and pancreas. CD266 is relatively highly expressed on HUVEC cells and certain tumor cell lines. TWEAK-induced CD266-mediated signaling can play roles in inflammation, the induction of apoptosis in certain cell types, the proliferation and migration of endothelial cells, and can promote angiogenesis within healthy and diseased tissues, eg, tumors. The ITEM-1 antibody can reportedly induce the proliferation of HUVEC cells and the death of certain TWEAK-sensitive tumor target cell lines. CD266 binds TWEAK (CD255) and can signal intracellularly by interactions with TRAF1, 2, and 3 cytoplasmic proteins leading to NF-κB 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).