The 6B1monoclonal antibody specifically binds to TREM-1 (Triggering Receptor Expressed on Myeloid Cells 1 or Triggering Receptor Expressed on Monocytes 1) which is also known as CD354. CD354 is a type I transmembrane glycoprotein that belongs to the immunoglobulin superfamily. CD354 is highly expressed by neutrophils and monocytes. It is also reportedly expressed at lower levels by a variety of cells including subsets of T and B cells, NK cells and dendritic cells. Its expression is upregulated on leucocytes in response to microbial lipopolysaccharide, eg, during microbial infections or sepsis. CD354 activation triggers the release of proinflammatory cytokines and chemokines. A soluble form of CD354 has been described that may play a protective role in some infectious disease states.
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).