The 11A8 monoclonal antibody specifically recognizes DNAX accessory molecule-1 (DNAM-1) which is also known as CD226, Platelet and T cell activation antigen 1 (PTA1), or T lineage-specific activation antigen 1 antigen (TLiSA1). CD226 is an ~65 kDa type I transmembrane glycoprotein that is encoded by CD226 (CD226 antigen) which belongs to the immunoglobulin superfamily (IgSF). The N-terminal extracellular region of CD226 (DNAM-1) contains two C2 type Ig-like domains which are followed by a transmembrane region and a cytoplasmic tail with predicted phosphorylation sites involved in signaling. This adhesion molecule is expressed on subsets of thymocytes, peripheral CD4+ and CD8+ T cells and B cells, NK cells, monocytes, macrophages, and platelets. CD226 (DNAM-1) associates with leukocyte function associated antigen-1 (LFA-1) and is involved in TCR-mediated signal transduction for T cell proliferation and differentiation. Interactions between the CD226 (DNAM-1) activating receptor and its ligands, CD112 and CD155, results in cellular signaling that promotes innate and adaptive immune responses, including the activation, differentiation, and survival of cytotoxic cells.
The antibody was conjugated to BD Horizon BUV737 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 737 nm. BD Horizon Brilliant BUV737 can be excited by the ultraviolet laser (355 nm) and detected with a 740/35 nm filter. Due to the excitation of the acceptor dye by the red laser line, there may be significant spillover into red laser detectors with filters in the 700-720 nm range.