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 Red 718, which has been developed exclusively for BD Biosciences as a better alternative to Alexa Fluor® 700. BD Horizon Red 718 can be excited by the red laser (628 – 640 nm) and, with an Em Max around 718 nm, it can be detected using a 730/45 nm filter. Due to similar excitation and emission properties, we do not recommend using R718 in combination with APC-R700 or Alexa Fluor® 700.