The 186107 monoclonal antibody specifically recognizes the Retinoic acid early inducible 1 (Rae-1) family of glycoproteins which is also known as retinoic acid early transcript 1. This family includes Rae-1α, β, δ, ε and γ, which are encoded by Raet1a, Raet1b, Raet1d, Raet1e, and Raet1c, respectively. Although expressed by some cells during mouse embryonic development, expression of these highly homologous membrane proteins is either low or absent on cells within adult tissues. These glycophosphatidylinositol (GPI)-linked proteins are structurally related to MHC class I molecules and contain alpha 1 and 2 domains. The Rae-1 family of glycoproteins serve as ligands for CD314 (NKG2D) which functions as an activating receptor expressed on some cytotoxic T cells and NK cells. Stress-induced Rae-1 proteins are expressed on tumor cells and might play a role in tumor rejection.
The antibody was conjugated to BD Horizon™ BUV661 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 661-nm. BD Horizon Brilliant BUV661 can be excited by the ultraviolet laser (355 nm) and detected with a 670/25 filter and a 630 nm LP. Due to cross laser excitation of this dye, there may be significant spillover into channels detecting APC-like emissions (eg, 670/25-nm filter).
Due to spectral differences between labeled cells and beads, using BD™ CompBeads can result in incorrect spillover values when used with BD Horizon BUV661 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended. Different BUV661 reagents (eg, CD4 vs. CD45) can have slightly different fluorescence spillover therefore, it may also be necessary to use clone-specific compensation controls when using these reagents.