The ACK2 monoclonal antibody specifically binds to CD117, which is also known as Proto-oncogene c-Kit (c-kit), Stem Cell Factor Receptor (SCFR), and Mast/stem cell growth factor receptor. This ~145 kDa type I transmembrane glycoprotein is encoded by Kit (KIT proto-oncogene receptor tyrosine kinase) which belongs to the receptor tyrosine kinase family (RTK) within the immunoglobulin superfamily (IgSF). CD117 (c-kit) serves as a receptor for c-Kit ligand (aka, stem cell factor or SCF). This receptor is expressed on multipotent hematopoietic stem cells and progenitors committed to myeloid and/or erythroid lineages, and precursors of B and T lymphocytes. CD117 (c-kit)-mediated signaling plays an important role in the activation, growth, proliferation, differentiation, and survival of cells in sustaining hematopoiesis. It is also involved in the development of mast cells and melanocytes. The specificity and functional activity of the ACK2 antibody is like that of another CD117 (c-kit)-specific antibody, ACK45. ACK2 is reported to block CD117 (c-kit) signaling in vitro and in vivo.
The antibody was conjugated to BD Horizon™ BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor™ 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.