The TUGh4 monoclonal antibody specifically binds to CD132. CD132 is a 65-70 kDa type 1 transmembrane glycoprotein that is encoded by the IL2RG (interleukin 2 receptor, gamma) gene. CD132 is also known as the common γ subunit (γc) and is shared by the IL-2, IL-4, IL-7, IL-9, IL-15 and IL-21 receptor complexes. CD132 is broadly expressed by most peripheral T and B lymphocytes, NK cells, monocytes, and granulocytes. The cytoplasmic domain of the γc chain plays an important role in cytokine-mediated signal transduction. Mutation of the IL2RG gene results in X-linked severe combined immunodeficiency (XSCID). The TUGh4 antibody recognizes a different epitope from that recognized by the CD132-specific clone, AG184.
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.