The V13-864 monoclonal antibody specifically recognizes CX3C motif chemokine Ligand 1 (CX3CL1), which is also known as fractalkine. CX3CL1 (Fractalkine) is the only known member of the CX3C chemokine subfamily and is expressed as both membrane-bound and secreted forms. Unlike other chemokines, CX3CL1is expressed on the surface of endothelial cells and not significantly expressed on peripheral blood leukocytes. CX3CL1's receptor is known as CX3CR1 and is expressed on cytotoxic T cells, NK cells, dendritic cells, and monocytes. Overexpression of CX3CL1 (Fractalkine) in some malignant tumors may contribute to the recruitment of effectors for innate and adaptive immunity.
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.