The 10/78 monoclonal antibody recognizes the rat CD161 proteins, CD161a (also known as, Klrb1a, or Nkrp1a/NKR-P1A), and CD161b (Klrb1b, Nkrp1b/NKR-P1B). These type II transmembrane glycoproteins have an extracellular C-type lectin domain and thus belong to the C-type lectin superfamily. These CD161 proteins form ~ 60 kDa homodimers that are expressed on natural killer cells and subsets of T lymphocytes, activated monocytes, and dendritic cells. The 10/78 antibody competes with the previously-described 3.2.3 antibody for binding to these CD161 proteins. CD161 molecules are C-type lectin-like receptors that can either activate (CD161a) or inhibit (CD161b) effector leucocyte responses, eg, cytotoxicity or cytokine production, against target cells which express C-type lectin-like related (Clr) molecules. Although several members of the Klrb1 gene family have been identified in the mouse and rat, only a single human KLRB1 homolog has been discovered.
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.