The 1C3 (AICD58.6) monoclonal antibody specifically binds to CD58. CD58 is a a 60-70 kDa glycoprotein member of the immunoglobulin superfamily. CD58, also referred to as the lymphocyte function-associated antigen-3 (LFA-3), has a wide tissue distribution, being expressed on both hematopoietic and non-hematopoietic cells, including endothelial cells and fibroblasts. There are two isoforms of CD58: a glycosylphosphatidylinositol (GPI)-linked form and a transmembrane form. Both isoforms may be expressed on the same cell type. Erythrocytes, however, only express the GPI-linked isoform. CD58 interacts with CD2 during cell adhesion. This binding can enhance antigen-specific T-cell activation. This interaction can also play a role in cell-mediated cytotoxicity.
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.