The HP-3G10 monoclonal antibody specifically recognizes human CD161 which is also known as Natural killer cell surface protein P1A (NKR-P1A or NKRP1A) or C-type lectin domain family 5 member B (CLEC5B). CD161 is expressed on the cell surface as an 80 kDa disulfide-linked homodimeric type II transmembrane glycoprotein. It is encoded by KLRB1 (Killer cell lectin-like receptor subfamily B member 1) which belongs to the Ca2+-dependent C-type lectin superfamily. CD161 is expressed on NK cells and on subsets of CD4+ and CD8+ αβ T cells, NKT cells, γδ T cells, CD3+ thymocytes, and fetal liver cells. CD161 is preferentially expressed on memory/effector T cells. CD161 can reportedly inhibit NK cell-mediated cytotoxicity and IFN-γ production. Lectin-like transcript 1 (LLT-1), encoded by CLEC2D (C-type lectin domain family 2 member D), has been described as a ligand for CD161. LLT-1 is expressed on some activated dendritic cells (DC) and B cells.
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.