The 13B 1E5 monoclonal antibody specifically binds to C-X-C chemokine receptor type 6 (CXCR6), which is also known as CD186, BONZO, T-lymphocyte-expressed seven-transmembrane domain receptor (TYMSTR), and Seven transmembrane receptor-like from clone 33 (STRL33). CXCR6 is a G-protein coupled chemokine receptor that is expressed on subsets of activated and memory T cells and NKT cells. CXCR6 binds to soluble CXCL16 and membrane-anchored CXCL16 expressed by dendritic cells and macrophages. The CXCL16 and CXCR6 interaction activates Akt and mTor signaling. This regulates cellular migration including the recruitment of tumor-infiltrating lymphocytes and may contribute to the progression and metastasis of various cancers. CXCR6 also can serve as a coreceptor for certain strains of HIV-1 and HIV-2.
The antibody was conjugated to BD Horizon™ BUV563 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 which has an Ex Max of 348 nm and an acceptor dye. The tandem has an Em Max at 563 nm. BD Horizon BUV563 can be excited by the 355 nm ultraviolet laser. On instruments with a 561 nm Yellow-Green laser, the recommended bandpass filter is 585/15 nm with a 535 nm long pass to minimize laser light leakage. When BD Horizon BUV563 is used with an instrument that does not have a 561 nm laser, a 560/40 nm filter with a 535 nm long pass may be more optimal. Due to the excitation and emission characteristics of the acceptor dye, there may be spillover into the PE and PE-CF594 detectors. However, the spillover can be corrected through compensation as with any other dye combination.