Clone JJC11.6 recognizes CD158i (KIR2DS4), a member of the killer immunoglobulin-like receptor (KIR) family expressed on natural killer (NK) cells. CD158i (KIR2DS4) provides an activation signal for NK lytic activity upon interaction with its ligand, HLA-Cw4, in an antigen-independent manner.
KIRs are monomeric receptors possessing high allelic polymorphism with either 2 or 3 Ig-like extracellular domains. The receptor family can be subdivided functionally according to the length of their cytoplasmic tail in inhibitory and activating KIRs.
Human peripheral blood mononuclear cells (PBMCs) were stained with CD158i (KIR2DS4) antibodies as well as with CD56 antibodies and analyzed by flow cytometry using the MACSQuant® Analyzer. The Tandem Signal Enhancer has been used to increase binding specificity of tandem-dye–conjugated antibodies. Cell debris and dead cells were excluded from the analysis based on scatter signals and propidium iodide fluorescence or 4',6-diamidino-2-phenylindole (DAPI) fluorescence, as in the case of tandems.