The KMC8 monoclonal antibody specifically binds to CD9 which is also known as Tetraspanin-29 (Tspan29). CD9 is a 24-kDa member of the transmembrane 4 superfamily, also called the tretraspanin family. In the mouse, CD9 is present on bone marrow myeloid cells, stromal cells, and megakaryocyte-committed progenitors; subsets of peripheral T and B lymphocytes; and neutrophils, platelets, dendritic cells, and bone marrow-derived macrophages. CD9 has been found to be associated with integrins and other cell-surface receptors. It appears to play roles in signal transduction and in regulating cellular adhesive properties. CD9 can also reportedly participate in T-cell costimulation and induction of apoptosis. The KMC8 antibody reportedly blocks certain CD9 functions and activates macrophages.
The antibody was conjugated to BD Horizon™ BUV496 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.