The 24F antibody reacts with CD86 (B7-2), a member of the Ig superfamily of transmembrane proteins. CD86, a ligand for CD28 and CD152 (CTLA-4), is one of the accessory molecules that plays an important role in T cell-B cell costimulatory interactions. CD86 is predominantly expressed on antigen-presenting cells. It can be upregulated on splenic B cells by in vitro polyclonal activation, such as LPS treatment. 24F mAb is reported to block the costimulatory function of rat CD86 and to immunoprecipitate CD86 from Lewis-S1 cell lysates.HTLV-1-transformed rat T-cell line Lewis-S1
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.